CN105717476B - The method of testing and system of a kind of digital electric energy meter - Google Patents

Abstract

The embodiment of the present invention discloses a testing method and system for a digital electric energy meter. Original data messages and standard measurement results are generated through standard element test data; the total number of frames and the number of changed frames are preset; and the network abnormality type is continuous abnormality Or random abnormality, convert the original data message into a continuous test data message or a random test data message, the digital energy meter to be tested generates the measurement result to be tested according to the above test data message, and compares it with the standard measurement result, Complete the test of the digital energy meter. In the above test process, the network environment of the digital energy meter can be simulated, and the performance of the digital energy meter can be greatly improved by quantitatively and accurately controlling the time characteristics of the message, changing the delay, controlling frame loss, controlling congestion, and changing the quality word. Conduct a more comprehensive and accurate test; and by analyzing the impact of different network abnormalities on the performance of the digital energy meter, it is possible to quantitatively analyze and study the processing mechanism of the digital energy meter.

Description

A testing method and system for a digital electric energy meter

technical field

The invention relates to the technical field of electric equipment testing, in particular to a testing method and system for a digital electric energy meter.

Background technique

With a large number of smart substations put into operation, digital energy meters have been widely used. Although, in theory, the digital energy meter has outstanding advantages, which can effectively improve the accuracy of the substation measurement system and reduce the comprehensive error of the electric energy measurement system.

However, many years of operating experience have shown that digital energy meters also have many shortcomings. For example, the accuracy of digital energy meters depends on the stability of network transmission conditions, and the jitter of network transmission can easily cause performance degradation of digital energy meters. Therefore, it is necessary to carry out comprehensive and in-depth research and testing on the measurement reliability of digital electric energy meters under abnormal conditions, to study and analyze the processing mechanism of digital electric energy meters under abnormal conditions, the corresponding relationship between error ratio and measurement error, and to evaluate digital energy meters. The measurement reliability and credibility of the electric energy meter, and how to test the stability and reliability of the digital electric energy meter under abnormal network conditions are technical problems that need to be solved urgently by those skilled in the art.

Contents of the invention

Embodiments of the present invention provide a testing method and system for a digital electric energy meter to solve the problem that it is difficult to test the stability and reliability of the digital electric energy meter in the prior art.

In order to solve the above technical problems, the embodiment of the present invention discloses the following technical solutions:

The embodiment of the present invention discloses a test method for a digital electric energy meter, the test method includes the following steps:

Generate raw data packets composed of raw data packet frames and standard measurement results based on standard source test data;

Preset the total number of frames and the number of changed frames;

Determining the network anomaly type, the network anomaly type including continuous anomaly and random anomaly;

If the network abnormality type is a continuous abnormality, convert the original data message into a continuous test data message according to the total number of frames and the number of changed frames; if the network abnormality is a random abnormality, according to the total number of frames and the number of changed frames Change the number of frames to convert the original data message into a random test data message;

Sending the continuous test data message or the random test data message to the digital electric energy meter to be tested to generate a measurement result to be tested; comparing the measurement result to be tested with the standard measurement result to complete the test.

Preferably, said converting the original data message into a continuous test data message includes:

Generate a random number of dropped frames in the interval [0, total frame number - change frame number - 1];

Judging whether the sending sequence number of the current original data message frame is in the interval of [random number of dropped frame, random number of dropped frame + number of changed frames);

If so, discard the current original data message frame, and generate a frame-loss continuous test data message as the continuous test data message.

Preferably, said converting the original data message into a continuous test data message includes:

Preset continuous discrete values;

Generate continuous discrete random numbers in the interval [0, total frame number - change frame number - 1];

Judging whether the sending sequence number of the current original data message frame is in the range of [continuous discrete random number, continuous discrete random number+change frame number);

If yes, judge whether the continuous discrete random number is an odd number; if the continuous discrete random number is an odd number, take the continuous negative discrete value corresponding to the continuous discrete value; if the continuous discrete random number is an even number, take the Continuous positive discrete values corresponding to continuous discrete values;

Calculate and obtain the continuous delay corresponding to the current original data message frame according to the continuous negative discrete value or the continuous positive discrete value;

generating discrete continuous test data packets as the continuous test data packets according to the continuous delay.

Preferably, said converting the original data message into a continuous test data message includes:

Preset the number of continuous sticky frames;

Preset the number of continuous interval frames corresponding to the original data message frame;

Generate blocking random numbers in the interval [0, total number of frames - number of changing frames * number of consecutive sticky frames - 1];

Judging whether the sending sequence number of the current original data message frame is in the interval of [blocking random number - changing frame number * continuous sticky frame number, blocking random number];

If yes, judge whether the remainder of the sending sequence number of the current original data message frame and the blocking random number difference to the number of consecutive sticky frames is 0; if the remainder is 0, then set the corresponding continuous interval frames of the current original data message frame The number is the number of consecutive sticky frames, otherwise, set the number of consecutive interval frames to 0;

Calculate the sequence number of the blocking continuous test data message according to the sum of the consecutive interval frames before the current sending sequence number, and generate a blocking continuous test data message as the continuous test data message according to the sequence number of the blocking continuous test data message.

Preferably, said converting the original data message into a continuous test data message includes:

Generate continuous quality random numbers in the interval [0, total number of frames - change number of frames - 1];

Judging whether the sending sequence number of the current original data message frame is in the interval of [continuous quality random number, continuous quality random number + change frame number];

If so, replace the original data value in the current original data message frame with an abnormal value, and generate a quality continuous test data message as the continuous test data message.

Preferably, said converting the original data message into a random test data message includes:

Preset the send abandonment flag corresponding to the original data message frame;

Determine whether the number of changed frames is less than the total number of frames/2;

If so, set all the sending discarding flags to 1; generate the first frame loss random number sequence composed of random numbers of changing frame numbers, the random number in the first frame loss random number sequence is [0, total frame Number-1] a natural number in the interval; the sending and discarding sign of the original data message frame corresponding to the first frame loss random number sequence is set to 0; judge whether the sending and discarding sign of the current original data message frame is 0, if it is , discarding the current original data message frame, if not, retaining the current original data message frame, and generating the first frame-losing random test data message as the random test data message;

If not, set all the sending abandonment flags to 0; generate a second frame loss random number sequence consisting of the total frame number-change frame number random numbers, and the random number in the second frame loss random number sequence is [ 0, the natural number in the interval of the total number of frames-1]; the sending and discarding identification of the original data message frame corresponding to the second frame loss random number sequence is set to 1; whether the sending and discarding identification of the current original data message frame is judged to be 1. If yes, keep the current original data packet frame, if not, discard the current original data packet frame, and generate a second frame-losing random test data packet as the random test data packet.

Preferably, said converting the original data message into a random test data message includes:

Preset random discrete value;

Judging whether the sending abandonment flag corresponding to the current original data message frame is 1;

If yes, judge whether the sending sequence number corresponding to the current original data message frame is an odd number; if yes, get the random negative discrete value corresponding to the random discrete value; if not, get the random positive discrete value corresponding to the random discrete value;

Calculate and obtain a random delay corresponding to the current original data message frame according to the random negative discrete value or the random positive discrete value;

Generate a discrete random test data packet as the random test data packet according to the random delay.

Preferably, said converting the original data message into a random test data message includes:

Preset the number of random sticky frames;

Generate a blocked random number sequence composed of a plurality of random numbers, the number of random numbers in the blocked random number sequence is in the interval [1, change frame number], and the value range of the random number in the blocked random number sequence is [0, total Frame number - number of random numbers * number of random sticky frames - 1] interval;

Judging whether the sending sequence number of the current original data message frame is in the range of [random number in the blocked random number sequence, random number in the blocked random number sequence + random sticky frame number];

If so, judge whether the sending sequence number of the current original data message frame is equal to the random number in the blocking random number sequence; The random interval frame number is 0;

Calculate the sequence number of the blocked random test data message according to the sum of the random interval frames before the current sending sequence number, and generate a blocked random test data message as the random test data message according to the sequence number of the blocked random test data message.

Preferably, said converting the original data message into a random test data message includes:

Generate random numbers corresponding to the number of changed frames in the interval [0, total number of frames - 1] and form a quality random number sequence;

Judging whether the sending sequence number of the current original data message is equal to the random number in the quality random number sequence;

If so, replace the original data value of the current original data message with an abnormal value, and generate a quality random test data message as the random test data message.

The embodiment of the present invention also provides a test system for a digital electric energy meter, including a standard source input device, a digital electric energy meter calibrator, a message controller, a high-precision analog meter, a protocol converter and a host computer, wherein:

The standard source input device includes a standard source secondary side analog three-phase voltage source and a standard source secondary side analog three-phase current source; the output terminal of the standard source secondary side analog three-phase voltage source is connected to the The input end of the digital energy meter calibrator is electrically connected to the input end of the high-precision analog meter; the output end of the secondary side analog three-phase current source of the standard source is connected to the input of the digital energy meter calibrator terminal and the input terminal of the high-end precision analog meter are all electrically connected;

The output end of the digital watt-hour meter calibrator is connected to the input end of the message controller, and the output end of the message controller is connected to the input end of the digital watt-hour meter to be tested, and the digital watt-hour meter to be tested is The output terminal is connected with the upper computer; the digital energy meter calibrator is used to generate the original data message composed of the original data message frame according to the standard source test data; the message controller is used for if the network abnormal type If it is a continuous abnormality, convert the original data message into a continuous test data message according to the preset total number of frames and the number of changed frames; if the network abnormality is a random abnormality, convert the original data message into The message is converted into a random test data message; the continuous test data message or the random test data message is sent to the digital watt-hour meter to be tested; the digital watt-hour meter to be tested generates a measurement result to be tested, and The measurement result to be measured is sent to the host computer;

The output end of the high-precision analog meter is connected to the input end of the protocol converter, and the output end of the protocol converter is connected to the upper computer; the high-precision analog meter generates a standard measurement result according to the standard source test data, and After format conversion by the protocol converter, it is sent to the host computer.

It can be seen from the above technical solutions that the testing method and system of the digital electric energy meter provided by the embodiment of the present invention generates original data messages and standard measurement results through standard element test data; presets the total number of frames and the number of changed frames; The type is continuous abnormality or random abnormality, and the original data message is converted into a continuous test data message or a random test data message. Comparing and completing the test of the digital electric energy meter. In the above test process, the network environment of the digital electric energy meter can be simulated, and the time characteristic of the message can be quantitatively and accurately controlled, the delay can be changed, the frame loss can be controlled, the blockage can be controlled, the quality word can be changed, etc., the digital electric energy meter The performance of the digital energy meter can be tested more comprehensively and accurately; and by analyzing the impact of different network anomalies on the performance of the digital energy meter, it is possible to qualitatively and quantitatively analyze the processing mechanism of the digital energy meter, the corresponding relationship between the error ratio and the measurement error, and the evaluation Measurement reliability and credibility of digital energy meters.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, In other words, other drawings can also be obtained from these drawings on the premise of not paying creative work.

Fig. 1 is a schematic flow chart of a testing method for a digital electric energy meter provided by an embodiment of the present invention;

Fig. 2 is a schematic flow chart of a method for converting continuous test data packets provided by an embodiment of the present invention;

Fig. 3 is a schematic flow chart of another continuous test data packet conversion method provided by an embodiment of the present invention

FIG. 4 is a schematic flow diagram of another method for converting continuous test data packets provided by an embodiment of the present invention;

FIG. 5 is a schematic flow diagram of another method for converting continuous test data packets provided by an embodiment of the present invention;

FIG. 6 is a schematic flowchart of a random test data message conversion method provided by an embodiment of the present invention;

FIG. 7 is a schematic flowchart of another random test data message conversion method provided by an embodiment of the present invention;

FIG. 8 is a schematic flow diagram of another random test data message conversion method provided by an embodiment of the present invention;

FIG. 9 is a schematic flowchart of another random test data message conversion method provided by an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a testing system for a digital electric energy meter provided by an embodiment of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

Referring to Fig. 1, it is a schematic flow chart of a test method of a digital electric energy meter provided by an embodiment of the present invention, the test method includes the following steps:

Step S101: Generating an original data packet composed of original data packet frames and a standard measurement result according to the standard source test data.

In the actual test process, the standard source secondary side analog voltage and standard source secondary side analog current are input as the standard source test data; the input standard source secondary side analog voltage and standard source secondary side analog current Sampling generates original data messages composed of original data message frames, which are used by the digital energy meter to be tested to generate test measurement results; the standard source secondary side analog voltage and standard source secondary side analog current are also input to the high precision analog meter , and take the measurement result of the high-precision analog meter as the standard measurement result. By comparing the test measurement result with the standard measurement result, the accuracy of the digital electric energy meter to be tested is further tested.

Step S102: preset the total number of frames and the number of changed frames.

When the user needs to simulate the situation that 1000 frames of original data message frames are lost by 50 frames, set the total number of frames to 1000 and the number of changed frames to 50; and count according to the total number of frames, when the processed original data message When the frame reaches the total frame number, reorganize and control a new group of total frame number original data message frames to generate test data message frames. In specific implementation, the sending sequence number of the message can also be set, the sending sequence number of the message is in the interval [0, total frame number-1], and whenever the sending sequence number is cycled to 0, the original data of the control is reorganized The message frame generates a test data message frame.

Step S103: Determine the type of network abnormality.

The types of network anomalies include continuous anomalies and random anomalies. In the actual working environment of the digital electric energy meter, due to the software and hardware characteristics of the signal source and the influence of network transmission, the abnormal changes of the digital sampled value messages are mainly caused by message frame loss, changes in the isolation divergence between transmissions, and message blocking. Annual report and data quality effective digit abnormality, etc. Continuous abnormalities are likely to be caused by hardware failure or software logic reasons; random abnormalities are easily caused by the overall software and hardware characteristics of the system or external interference. Therefore, the test method of the digital electric energy meter provided in the embodiment of the present invention provides the simulation simulation of the above-mentioned two kinds of network anomalies. During the specific implementation, the host computer can select and determine the network anomaly type as continuous anomaly or random anomaly, so as to detect different Network anomalies are simulated.

Step S104: Convert the original data packet into a continuous test data packet or a random test data packet according to whether the network anomaly type is continuous anomaly or random anomaly, and the total number of frames and the number of changed frames.

If the network abnormality type is a continuous abnormality, convert the original data message into a continuous test data message according to the total number of frames and the number of changed frames, see Figure 2, which is a continuous test data message provided by an embodiment of the present invention Schematic flow chart of conversion method, described conversion method comprises the following steps:

Step S201: Generate random numbers for frame loss in the interval [0, total number of frames-number of changed frames-1].

The frame loss random number is generated by an equal-probability random number extraction algorithm, and the frame loss random number is in the interval [0, total frame number-change frame number-1]. Of course, the range of the frame loss random number can be limited to In a smaller range, such as the interval [1, total number of frames - number of changed frames - 2], etc.; the method of generating random numbers is a commonly used method at present, and will not be repeated here.

Step S202: Judging whether the sending sequence number of the current original data message frame is within the range of [random number of dropped frames, random number of dropped frames + number of changed frames).

The original data message is composed of original data message frames and sent in the form of message frames; each frame of original data message frame corresponds to the corresponding sending sequence number, for example, the definition of the sending sequence number of the original data message frame that arrives first is the total frame number -1, the sending sequence number of the second arriving original data message frame is defined as the total frame number -2, and the subsequent arriving original data message frames are numbered sequentially until the original data message frame of the total number of frames The sending sequence number corresponding to the frame is 0, and a total of raw data message frames corresponding to the total number of frames have been collected so far; for subsequent raw data message frames, follow the above method again to carry out a new round of sending sequence numbering.

Comparing the sending sequence number of the current original data message frame, judging whether the sending sequence number of the current original data message frame is in the interval of [random number of frame loss, random number of frame loss+change frame number).

Step S203: If yes, discard the current original data message frame, and generate a frame-loss continuous test data message as the continuous test data message.

By the judgment result of step S202, if the sending sequence number of the current original data message frame is in the interval of [frame loss random number, frame loss random number+change frame number), then discard the current original data message frame; if not, then keep Current raw data telegram frame. Finally, the discarded original data message frames are organized into frame loss continuous test data messages to simulate the frame loss phenomenon in the working process of the digital energy meter and test the measurement accuracy of the digital energy meter.

During the frame loss simulation process, the sending parameters of the frame loss continuous test data message in each frame are set as follows:

seq=dtCounter/(count/1000)

offset=dtCounter%(count/1000)

Among them, dtCounter is the relative count value in seconds when the original message data frame arrives, count is the count value per unit time counted by FPGA, seq is the millisecond serial number of the message, and offset is the relative delay in milliseconds between each frame.

In order to simulate the separation and separation of the original data packets from the signal source, referring to Fig. 3, it is a schematic flow chart of another method for converting continuous test data packets provided by an embodiment of the present invention. The conversion method includes the following steps:

Step S301: Preset continuous discrete values.

The continuous discrete value is preset, and the value range of the continuous discrete value is [-10,10].

Step S302: Generate continuous discrete random numbers in the interval [0, total number of frames-change frame number-1].

The equal-probability random number extraction algorithm is used to generate a random number in the interval [0, total number of frames-change frame number-1] as the continuous discrete random number.

Step S303: Judging whether the sending sequence number of the current original data message is in the range of [continuous discrete random number, continuous discrete random number+changing frame number).

Comparing the sending sequence number of the current original data message frame, judging whether the sending sequence number of the current original data message is in the range of [continuous discrete random number, continuous discrete random number+change frame number).

Step S304: If yes, judge whether the discrete random number is an odd number; if the discrete random number is odd, take the continuous negative discrete value corresponding to the continuous discrete value; if the continuous discrete random number is even, take the The continuous positive discrete value corresponding to the above continuous discrete value.

Through the judgment of step S303, if the sending sequence number of the current original data message frame is in the interval of [continuous discrete random number, continuous discrete random number+change frame number), the parity of the continuous discrete random number generated according to step S302 is processed separately ; Specifically, when the continuous discrete random number is an odd number, it is regarded as a negative bias, that is, the negative value of the continuous discrete value is taken as the continuous negative discrete value, for example, if the continuous discrete value is 10, then the The continuous negative discrete value is -10; when the random number of the continuous discrete value is an even number, it is regarded as a positive bias, that is, the continuous positive discrete value corresponding to the continuous discrete value is taken, for example, if the continuous discrete value is -10 , then the continuous positive discrete value is 10.

Step S305: According to the continuous negative discrete value or the continuous positive discrete value, calculate and obtain the continuous delay corresponding to the current original data packet frame.

During specific implementation, the continuous delay is calculated according to the following formula:

Δt=Δ*count/1000000

t=count/f

offset=n%(f/1000)*t+Δt

Wherein, n is the sending sequence number corresponding to the current raw data message frame, f is the sending frequency of the original data message configured by the host computer, Δ is a continuous discrete value, that is, the continuous negative discrete value or the continuous positive discrete value, and count is The count value per unit time counted by the FPGA, t is the count value corresponding to the average sending interval of each frame of messages, and offset is the continuous delay.

Step S306: Generate discrete continuous test data packets as the continuous test data packets according to the delay.

According to the time delay calculated in step S305, set the message frame sending rule to simulate the bad situation such as the high isolation divergence between message frames, such as reaching 1ms, and then to the situation where the digital electric energy meter has a high isolation divergence between messages lower performance. During specific implementation, when the sending serial number of the original data message frame is in the sampling sequence, that is, the sending serial number of the original data message frame is located in the [continuous discrete random number, continuous discrete random number+change frame number) interval, except according to the above Delay sets the sending parameters of the discrete continuous test data message, and also calculates the message millisecond sequence number of the discrete continuous test data message according to the following formula:

seq=n/(f/1000)

When the original data message frame is not in the sampling sequence, that is, the sending sequence number of the original data message frame is less than the continuous discrete random number, or the sending sequence number of the original data message frame is greater than or equal to the continuous discrete random number+change frame number , generating the discrete and continuous test data packets according to the following sending parameters:

seq=n/(f/1000)

offset=n%(f/1000)*t

Generate discrete continuous test data packets as the continuous test data packets according to the continuous delay and the packet millisecond sequence numbers in the above two cases.

In order to simulate message blocking, referring to Fig. 4, the embodiment of the present invention also provides a schematic flow chart of another method for converting continuous test data messages, the method comprising the following steps:

Step S401: Preset the number of consecutive sticky frames.

The number of consecutive sticky frames is preset, and the value range of the number of continuous sticky frames is [0, f/1000], where f is the sending frequency of the original data message.

Step S402: Preset the number of consecutive interval frames corresponding to the original data frame.

A corresponding number of consecutive interval frames is set for each arriving original data message frame, and the value of the number of consecutive interval frames is 1.

Step S403: Generate blocking random numbers in the interval [0, total number of frames - number of changing frames * number of consecutive sticky frames - 1].

Call the equal-probability random value extraction algorithm to generate a random number as the blocking random number, and the value range of the blocking random number is [0, total number of frames - number of changing frames * number of consecutive sticky frames - 1].

Step S404: Judging whether the sending sequence number of the current original data message frame is in the range of [blocking random number - changing frame number * continuous sticking frame number, blocking random number] interval.

Step S405: If yes, judge whether the remainder of (current original data message sending sequence number-blocking random number)% continuous sticky frame number is 0; if the remainder is 0, then set the continuous interval corresponding to the current original data message frame The number of frames is the number of consecutive sticky frames, otherwise, set the number of consecutive interval frames to 0.

After subtracting the blocking random number from the sending sequence number of the current original data message frame, calculate the remainder of the number of consecutive sticky frames, and judge whether the remainder is 0; Set to the number of consecutive sticky frames; otherwise, if the remainder is not 0, set the number of consecutive interval frames corresponding to the current original data packet frame to 0.

Step S406: Calculate the sequence number of the blocking continuous test data message according to the sum of the consecutive interval frames before the current sending sequence number, and generate a blocking continuous test data message as the continuous test data message according to the sequence number of the blocking continuous test data message arts.

The number of consecutive intervals corresponding to the current original data message frame and the number of consecutive intervals corresponding to the original data message frame before the sending sequence number of the current original data message frame are added to obtain the sum of the number of consecutive interval frames; according to the The sum of the number of frames at consecutive intervals is used to calculate the serial number of the blocking continuous test data packet. The calculation formula is as follows:

seq=sum/(f/1000)

Wherein, sum is the sum of the number of continuous interval frames, smpinter[i] is the number of consecutive interval frames corresponding to the i-th original data message frame, and seq is the sequence number of the blocking continuous test data message.

At the same time, calculate the delay of blocking continuous test data message frames according to the following formula:

offset=n%(f/1000)*interval

interval=count/f

Wherein, the meanings of n, count, and f are consistent with the descriptions in the above steps, and will not be repeated here.

In order to perform abnormal quality simulation, see FIG. 5, which is a schematic flow chart of another method for converting continuous test data messages provided by an embodiment of the present invention. The method includes the following steps:

Step S501: Generate continuous quality random numbers within the interval [0, total number of frames - number of changed frames - 1].

Step S502: Judging whether the sending sequence number of the current original data message frame is within the interval of [continuous quality random number, continuous quality random number+change frame number].

Step S503: If yes, replace the original data value in the current original data message frame with an abnormal value, and generate a quality continuous test data message as the continuous test data message.

According to the judgment of step S502, if the sending sequence number of the current original data message frame is in the interval of [continuous quality random number, continuous quality random number+changing frame number], then the original data value in the current original data message frame is replaced with abnormal value. In the specific implementation, the original data message frame carries original data such as voltage or current, and according to the offset value and data length of the first address of the abnormal value relative to the message, the original data is replaced with the abnormal value; the replaced original data message frame As the quality continuous test data message frame, and the quality continuous test data message frame is generated by the quality continuous test data message frame as the continuous test data message, to test the performance of the digital electric energy meter when the data quality is abnormal .

If the network anomaly type is a random anomaly, convert the original data message into a random test data message according to the total number of frames and the number of changed frames, see Figure 6, which is a random test data message provided by an embodiment of the present invention Schematic flow chart of conversion method, described conversion method comprises the following steps:

Step S601: Presetting the sending abandonment flag corresponding to the original data packet frame.

For each original data message frame, a corresponding sending discard flag is set, and the value of the sending discarding flag is 0 or 1. Of course, in specific implementation, the sending discarding flag can also be a Boolean number TRUE or FALSE.

Step S602: Determine whether the number of changed frames is less than the total number of frames/2.

Step S603: If yes, set all the sending abandonment flags to 1; generate a first frame loss random number sequence composed of random numbers of changing frame numbers, and the random numbers in the first frame loss random number sequence are [0 , the natural number in the interval of the total number of frames-1]; the sending and discarding identifier of the original data message frame corresponding to the first frame loss random number sequence is set to 0; whether the sending and discarding identifier of the current original data message frame is judged to be 0 , if yes, discarding the current original data message frame, if not, retaining the current original data message frame, and generating a first frame-losing random test data message as the random test data message.

If the number of changed frames is less than 1/2 of the total number of frames, set the sending discard flags corresponding to all original data message frames to 1; call the equal-probability random number generation algorithm from the natural number [0, total number of frames-1] interval Generate random numbers of changing frame numbers, and the random numbers of changing frame numbers are called frame-lost random numbers; from the original data message frame, the sending sequence number is consistent with the random numbers in the frame-losing random numbers original data message frame, and set the send discard flag corresponding to the original data message frame taken out to 0; if the send discard mark of the current original data message frame is 0, discard the current original data message frame, if the current original data If the sending and discarding flag of the message frame is 1, the current original data message frame will be retained; finally, the original data message frame processed above will be composed of a random frame loss test data message, so as to test the frame pair number under random abnormal conditions. Influence of the type electric energy meter performance.

Step S604: If not, set all the sending abandonment flags to 0; generate a second random number sequence of frame loss consisting of random numbers of the total number of frames - the number of changed frames, and the random number in the second random number sequence of frame loss The number is a natural number in the interval [0, total number of frames-1]; the sending and discarding sign of the original data message frame corresponding to the second frame loss random number sequence is set to 1; the sending and discarding of the current original data message frame is judged Whether the flag is 1, if yes, retain the current original data packet frame, if not, discard the current original data packet frame, and generate a second frame-losing random test data packet as the random test data packet.

According to the judgment of step S602, when the number of changed frames is greater than or equal to the total number of frames/2, all sending and discarding flags are set to 0; the second random number sequence composed of the total number of frames-number of changed frames random numbers is generated , the random number in the second frame-losing random number sequence is a natural number in the interval [0, total number of frames-1]; the original data message frame whose sequence number is consistent with the random number in the second frame-losing random number sequence is sampled and sent , and set the sending and discarding flag corresponding to the sampled original data message frame to 1; judge whether the sending and discarding flag of the current original data message frame is 1, if yes, keep the current original data message frame, if not, discard For the current original data message frame, the original data message frame after the above processing is organized into the second frame loss random test data message, and sent to the digital electric energy meter to be tested as a random test data message to measure the digital electric energy. The table performs a data frame loss test under random abnormal conditions.

In order to detect the influence of the interval divergence of the data digital electric energy meter on the test accuracy under random abnormal conditions, on the basis of the conversion method of the random test data message shown in Figure 6, see Figure 7, another example provided for the embodiment of the present invention A schematic flow chart of a method for converting random test data packets, the method for converting comprises the following steps:

Step S701: Preset random discrete values.

The value range of the random discrete value is [-10,10].

Step S702: Determine whether the sending abandonment flag corresponding to the current original original data message frame is 1.

Step S703: If yes, judge whether the sending sequence number corresponding to the current original data message frame is an odd number; if yes, take the random negative discrete value corresponding to the random discrete value; if not, take the random positive discrete value corresponding to the random discrete value discrete value.

According to the judgment result of step S702, if the sending abandonment mark corresponding to the current original data message frame is 1, it is further judged whether the sending sequence number corresponding to the current original data message frame is an odd number, if so, it is regarded as a negative bias, that is, the described The random negative discrete value corresponding to the random discrete value, for example, if the random discrete value is -2, the random negative discrete value is still maintained at -2; if the sending sequence number corresponding to the current original data message frame is an even number, As a positive bias, that is, take the random positive discrete value corresponding to the random discrete value, for example, if the random discrete value is -2, then the random positive discrete value is 2.

Step S704: According to the random negative discrete value or the random positive discrete value, calculate and obtain the random delay corresponding to the current original data packet frame.

The random delay corresponding to the current original data message frame represents the delay between the current original data message frame and the next original message frame by the sending sequence number; during specific implementation, according to the judgment result of step S702, if the current original If the sending abandonment flag corresponding to the data message frame is 1, then the random delay is calculated according to the random negative discrete value or the random arrangement value, and the calculation formula of the random delay is consistent with the formula in step S305, which is not mentioned here Let me repeat.

Step S705: Generate a discrete random test data packet as the random test data packet according to the random delay.

Generate the discrete random test data message according to the calculation result of the random delay, when the sending discard flag is 1, the sending parameters of the discrete random test data message pass through the original data message in step S305 and step S306 The calculation formula when the sending sequence number of the text frame is in the sampling sequence is calculated; when the sending and discarding flag is 0, the sending parameters of the discrete random test data message are not in the sampling sequence through the original data message frame in step S306 The calculation formula of time is calculated. The discrete random test data message obtained by the above sending parameters is used as the random test data message.

When simulating message blocking under random abnormal conditions, referring to FIG. 8 , it is a schematic flow chart of another random test data message conversion method provided by the embodiment of the present invention. The method includes the following steps:

Step S801: Preset the number of random sticky frames.

The value range of the number of random sticky frames is consistent with the value range of step S401, and will not be repeated here.

Step S802: Generate a blocked random number sequence composed of multiple random numbers, the number of random numbers in the blocked random number sequence is in the interval [1, number of changing frames], and the value range of the random numbers in the blocked random number sequence is [ 0, the total number of frames - the number of random numbers * the number of random sticky frames - 1] interval.

The blocked random number sequence is generated by calling an equal-probability random number extraction algorithm multiple times.

Step S803: Judging whether the sending sequence number of the current original data message frame is within the range of [the random number in the blocked random number sequence, the random number in the blocked random number sequence+the number of random sticky frames].

Perform range judgment on each random number element in the blocked random number sequence, and judge whether the sending sequence number of the current original data message frame is within the above range.

Step S804: If yes, determine whether the sending sequence number of the current original data message frame is equal to the random number in the blocking random number sequence; if equal, then set the random interval frame number corresponding to the current original data message frame as the number of random sticky frames; otherwise , set the random interval frame number to 0.

Step S805: Calculate a random test data message sequence number according to the sum of random interval frames before the current sending sequence number, and generate a random blocking test data message as the random test data message according to the random test data message sequence number.

The sending parameters of the random blocking test data packet are as described in step S406, and will not be repeated here.

In order to perform quality abnormal simulation under random abnormal conditions, see FIG. 9 , which is a schematic flowchart of another random test data message conversion method provided by an embodiment of the present invention. The method includes the following steps:

Step S901: Generate random numbers corresponding to the number of changed frames in the interval [0, total number of frames-1] and form a quality random number sequence.

Step S902: Determine whether the sending sequence number of the current original data packet is equal to the random number in the quality random number sequence.

Step S903: If yes, replace the original data value of the current original data message with an abnormal value, and generate a quality random test data message as the random test data message.

For the specific process of replacing the original data value with an abnormal value, refer to step S503 and will not go into details here.

It should be noted that after the network abnormality type is determined, independent continuous test data packets or random test data packets may be generated for different network states. For the convenience of description, a detailed description will be given here of generating the continuous test data packets when the network state is continuously abnormal. When the user only simulates the network frame loss situation, generate continuous frame loss test data packets according to the description of steps S201 to S203, or the user simulates other network abnormalities such as network dispersion, packet congestion, and abnormal packet quality , corresponding discrete continuous test data messages, blocking continuous test data messages and quality continuous test data messages are generated respectively. In the embodiment of the present invention, network abnormalities are often more complex and changeable, and network frame loss, network dispersion, packet congestion, and packet quality anomalies are often interrelated, so more complex continuous test data packets can be generated according to the above steps , such as generating network frame loss+network discrete continuous test data messages, during specific implementation, it is possible to first generate frame loss continuous test data messages, and discretize the delay of the frame loss continuous test data message frames so that Generate the discrete continuous test data message; it is also possible to simulate the network condition of network frame loss + abnormal message quality, for example, first generate the frame loss continuous test data message, and then randomly sample the frame loss continuous test data message Generate quality continuous test data packets.

Step S105: Send the continuous test data message or the random test data message to the digital electric energy meter to be tested to generate a measurement result to be tested; compare the measurement result to be tested with the standard measurement result to complete the test.

Send the continuous test data message or random test data message generated in step S104 to the digital electric energy meter to be tested, and the digital electric energy meter to be tested performs measurement according to the above test data message to generate a measurement result to be tested as a test Data; compare the measured measurement results with the standard measurement results, so that it can be determined that the accuracy of the digital electric energy meter to be tested is evaluated under abnormal conditions in the network, and through long-term monitoring and statistics of measurement results, analysis The processing mechanism of the digital energy meter under abnormal conditions, the corresponding relationship between the error ratio and the measurement error, and the evaluation of the measurement reliability and credibility of the digital energy meter.

It should be noted that, in the actual test process, the user controls to restore the abnormal network status to the normal network status, so as to meet the requirements of comparative testing or cooperating with other testing instruments for testing. In actual implementation, it can be set by setting the total number of frames and the number of changed frames. For example, if the total number of frames and the number of changed frames are both set to 0, then the network status during the test is normal; or, use the current common method in In the host computer setting-selection window, choose whether to open the network abnormal simulation or the network status is normal.

It can be seen from the above-mentioned embodiments that the testing method of the digital electric energy meter provided by the embodiment of the present invention generates the original data message and the standard measurement result through the standard element test data; presets the total number of frames and the number of changed frames; For continuous abnormality or random abnormality, the original data message is converted into continuous test data message or random test data message. Yes, complete the digital energy meter test. In the above test process, the network environment of the digital electric energy meter can be simulated, and the time characteristic of the message can be quantitatively and accurately controlled, the delay can be changed, the frame loss can be controlled, the blockage can be controlled, the quality word can be changed, etc., the digital electric energy meter The performance of the digital energy meter can be tested more comprehensively and accurately; and by analyzing the impact of different network anomalies on the performance of the digital energy meter, it is possible to qualitatively and quantitatively analyze the processing mechanism of the digital energy meter, the corresponding relationship between the error ratio and the measurement error, and the evaluation Measurement reliability and credibility of digital energy meters.

Through the description of the above method embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions to make a A computer device (which may be a personal computer, a server, or a network device, etc.) executes all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program codes such as read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk.

Corresponding to the embodiment of a testing method for a digital electric energy meter provided by the present invention, the present invention also provides a testing system for a digital electric energy meter.

Referring to Fig. 10, it is a schematic structural diagram of a test system for a digital electric energy meter provided by an embodiment of the present invention. The test system includes a standard source input device 1, a digital electric energy meter calibrator 2, a message controller 3, a high Precision analog meter 4, protocol converter 5 and host computer 6.

Wherein, the standard source input device 1 includes a standard source secondary side analog three-phase voltage source 11 and a standard source secondary side analog three-phase current source 12; the standard source secondary side analog three-phase voltage source 11 The output end of the digital energy meter calibrator 2 and the input end of the high-precision analog meter 4 are all electrically connected; the output end of the standard source secondary side analog three-phase current source 12 is connected to the The input end of the digital electric energy meter calibrator 2 and the input end of the high-end precision analog meter 4 are electrically connected. The standard source input device 1 is used to provide the secondary side analog three-phase voltage of the standard source for testing and the standard source secondary side analog three-phase current.

The output end of the digital watt-hour meter calibrator 2 is connected with the input end of the message controller 3, and the output end of the message controller 3 is connected with the input end of the digital watt-hour meter 7 to be tested. The output end of measuring digital electric energy meter 7 is connected with upper computer 6; Described digital electric energy meter calibration instrument 2 is used for generating the original data message that is made up of original data message frame according to standard source test data; Said message The controller 3 is used to convert the original data message into a continuous test data message according to the preset total number of frames and the number of changed frames if the network abnormality type is a continuous abnormality; if the network abnormality is a random abnormality, according to the total frame number number and change the number of frames, and convert the original data message into a random test data message; send the continuous test data message or the random test data message to the digital electric energy meter to be tested; the digital electric energy to be tested Table 7 generates the measurement result to be tested according to the continuous test data message or the random test data message, and sends the measurement result to the host computer 6 . During specific implementation, the message controller 3 sends a continuous test data message or a random test data message conforming to the IEC61850-9-2 protocol to the digital electric energy meter 7 to be tested.

The output end of described high-precision analog meter 4 is connected with the input end of protocol converter 5, and the output end of described protocol converter 5 is connected with upper computer; Described high-precision analog meter 4 generates standard according to standard source test data The measurement results are sent to the upper computer 6 after format conversion by the protocol converter 5 . The high-precision analog meter receives the standard source secondary side analog three-phase voltage and the standard source secondary side analog three-phase current from the standard source input device, and transmits the electric energy data to the protocol converter 5 through the 485 communication 645 protocol, The protocol converted by the protocol converter 5 into the IEC61850 protocol is uploaded to the host computer 6 via the switch, and used as the standard measurement result of electric energy measurement.

It can be seen from the above-mentioned embodiments that the test system for digital electric energy meters provided by the embodiments of the present invention includes a standard source input device 1, a digital electric energy meter calibrator 2, a message controller 3, a high-precision analog meter 4, and a protocol converter 5 and the upper computer 6; the high-precision analog meter 4 receives the standard source secondary side analog three-phase voltage and three-phase current in the system, and transmits the electric energy data to the protocol converter 5 through the 485 communication 645 protocol, and converts it by the protocol The device 5 is uploaded to the upper computer 6 through the IEC61850 protocol, as the standard data of electric energy measurement; the digital electric energy meter to be tested receives the IEC61850-9-2 data sent by the digital electric energy meter calibrator 2 through the message controller 3, And transmit the data to the upper computer 6; wherein the digital energy meter calibrator 2 receives the analog three-phase voltage and three-phase current from the secondary side of the system standard source, and communicates with the digital energy meter calibrator 2 through the message controller 3 The IEC61850-9-2 message sent to the digital energy meter 7 to be tested is quantitatively controlled for packet loss, dispersion, congestion, and abnormal quality to detect the impact of various network anomalies on the performance of the digital energy meter. The processing mechanism of the digital energy meter under abnormal conditions, the corresponding relationship between the error rate and the measurement error, and the evaluation of the measurement reliability and credibility of the digital energy meter.

For the convenience of description, when describing the above devices, functions are divided into various units and described separately. Of course, when implementing the present invention, the functions of each unit can be implemented in one or more pieces of software and/or hardware.

Each embodiment in this specification is described in a progressive manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device or system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and for relevant parts, refer to part of the description of the method embodiments. The device and system embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, It can be located in one place, or it can be distributed to multiple network elements. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood and implemented by those skilled in the art without creative effort.

It should be noted that in this article, relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these No such actual relationship or order exists between entities or operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above descriptions are only specific embodiments of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A test method for digital watt-hour meter, is characterized in that, comprises the following steps: Generate raw data packets composed of raw data packet frames and standard measurement results based on standard source test data; Preset the total number of frames and the number of changed frames; Determining the network anomaly type, the network anomaly type including continuous anomaly and random anomaly; If the network abnormality type is a continuous abnormality, convert the original data message into a continuous test data message according to the total number of frames and the number of changed frames; if the network abnormality is a random abnormality, according to the total number of frames and the number of changed frames Change the number of frames to convert the original data message into a random test data message; Sending the continuous test data message or the random test data message to the digital electric energy meter to be tested to generate a measurement result to be tested; comparing the measurement result to be tested with the standard measurement result to complete the test. 2. the test method of digital electric energy meter according to claim 1, is characterized in that, described original data message is converted into continuous test data message, comprising: Generate a random number of dropped frames in the interval [0, total frame number - change frame number - 1]; Judging whether the sending sequence number of the current original data message frame is in the interval of [random number of dropped frame, random number of dropped frame + number of changed frames); If so, discard the current original data message frame, and generate a frame-loss continuous test data message as the continuous test data message. 3. the testing method of digital electric energy meter according to claim 1, is characterized in that, described original data message is converted into continuous test data message, comprising: Preset continuous discrete values; Generate continuous discrete random numbers in the interval [0, total frame number - change frame number - 1]; Judging whether the sending sequence number of the current original data message frame is in the range of [continuous discrete random number, continuous discrete random number+change frame number); If yes, judge whether the continuous discrete random number is an odd number; if the continuous discrete random number is an odd number, take the continuous negative discrete value corresponding to the continuous discrete value; if the continuous discrete random number is an even number, take the Continuous positive discrete values corresponding to continuous discrete values; Calculate and obtain the continuous delay corresponding to the current original data message frame according to the continuous negative discrete value or the continuous positive discrete value; generating discrete continuous test data packets as the continuous test data packets according to the continuous delay. 4. the test method of digital electric energy meter according to claim 1, is characterized in that, described original data message is converted into continuous test data message, comprising: Preset the number of continuous sticky frames; Preset the number of continuous interval frames corresponding to the original data message frame; Generate blocking random numbers in the interval [0, total number of frames - number of changing frames * number of consecutive sticky frames - 1]; Judging whether the sending sequence number of the current original data message frame is in the interval of [blocking random number - changing frame number * continuous sticky frame number, blocking random number]; If yes, judge whether the remainder of the sending sequence number of the current original data message frame and the blocking random number difference to the number of consecutive sticky frames is 0; if the remainder is 0, then set the corresponding continuous interval frames of the current original data message frame The number is the number of consecutive sticky frames, otherwise, set the number of consecutive interval frames to 0; Calculate the sequence number of the blocking continuous test data message according to the sum of the consecutive interval frames before the current sending sequence number, and generate a blocking continuous test data message as the continuous test data message according to the sequence number of the blocking continuous test data message. 5. the test method of digital electric energy meter according to claim 1, is characterized in that, described original data message is converted into continuous test data message, comprising: Generate continuous quality random numbers in the interval [0, total number of frames - change number of frames - 1]; Judging whether the sending sequence number of the current original data message frame is in the interval of [continuous quality random number, continuous quality random number + change frame number]; If so, replace the original data value in the current original data message frame with an abnormal value, and generate a quality continuous test data message as the continuous test data message. 6. the test method of digital electric energy meter according to claim 1, is characterized in that, described original data message is converted into random test data message, comprising: Preset the send abandonment flag corresponding to the original data message frame; Determine whether the number of changed frames is less than the total number of frames/2; If so, set all the sending discarding flags to 1; generate the first frame loss random number sequence composed of random numbers of changing frame numbers, the random number in the first frame loss random number sequence is [0, total frame Number-1] a natural number in the interval; the sending and discarding sign of the original data message frame corresponding to the first frame loss random number sequence is set to 0; judge whether the sending and discarding sign of the current original data message frame is 0, if it is , discarding the current original data message frame, if not, retaining the current original data message frame, and generating the first frame-losing random test data message as the random test data message; If not, set all the sending abandonment flags to 0; generate a second frame loss random number sequence consisting of the total frame number-change frame number random numbers, and the random number in the second frame loss random number sequence is [ 0, the natural number in the interval of the total number of frames-1]; the sending and discarding identification of the original data message frame corresponding to the second frame loss random number sequence is set to 1; whether the sending and discarding identification of the current original data message frame is judged to be 1. If yes, keep the current original data packet frame, if not, discard the current original data packet frame, and generate a second frame-losing random test data packet as the random test data packet. 7. the test method of digital electric energy meter according to claim 6 is characterized in that, described original data message is converted into random test data message, comprising: Preset random discrete value; Judging whether the sending abandonment flag corresponding to the current original data message frame is 1; If yes, judge whether the sending sequence number corresponding to the current original data message frame is an odd number; if yes, get the random negative discrete value corresponding to the random discrete value; if not, get the random positive discrete value corresponding to the random discrete value; Calculate and obtain a random delay corresponding to the current original data message frame according to the random negative discrete value or the random positive discrete value; Generate a discrete random test data packet as the random test data packet according to the random delay. 8. the test method of digital electric energy meter according to claim 1, is characterized in that, described original data message is converted into random test data message, comprising: Preset the number of random sticky frames; Generate a blocked random number sequence composed of a plurality of random numbers, the number of random numbers in the blocked random number sequence is in the interval [1, change frame number], and the value range of the random number in the blocked random number sequence is [0, total Frame number - number of random numbers * number of random sticky frames - 1] interval; Judging whether the sending sequence number of the current original data message frame is in the range of [random number in the blocked random number sequence, random number in the blocked random number sequence + random sticky frame number]; If so, judge whether the sending sequence number of the current original data message frame is equal to the random number in the blocking random number sequence; The random interval frame number is 0; Calculate the sequence number of the blocked random test data message according to the sum of the random interval frames before the current sending sequence number, and generate a blocked random test data message as the random test data message according to the sequence number of the blocked random test data message. 9. the test method of digital electric energy meter according to claim 1, is characterized in that, described original data message is converted into random test data message, comprising: Generate random numbers corresponding to the number of changed frames in the interval [0, total number of frames - 1] and form a quality random number sequence; Judging whether the sending sequence number of the current original data message is equal to the random number in the quality random number sequence; If so, replace the original data value of the current original data message with an abnormal value, and generate a quality random test data message as the random test data message. 10. A test system for a digital watt-hour meter, characterized in that it includes a standard source input device, a digital watt-hour meter calibrator, a message controller, a high-precision analog meter, a protocol converter and a host computer, wherein: The standard source input device includes a standard source secondary side analog three-phase voltage source and a standard source secondary side analog three-phase current source; the output terminal of the standard source secondary side analog three-phase voltage source is connected to the The input end of the digital energy meter calibrator is electrically connected to the input end of the high-precision analog meter; the output end of the secondary side analog three-phase current source of the standard source is connected to the input of the digital energy meter calibrator end and the input end of the high-precision analog meter are all electrically connected; The output end of the digital watt-hour meter calibrator is connected to the input end of the message controller, and the output end of the message controller is connected to the input end of the digital watt-hour meter to be tested, and the digital watt-hour meter to be tested is The output terminal is connected with the upper computer; the digital energy meter calibrator is used to generate the original data message composed of the original data message frame according to the standard source test data; the message controller is used for if the network abnormal type If it is a continuous abnormality, convert the original data message into a continuous test data message according to the preset total number of frames and the number of changed frames; if the network abnormality is a random abnormality, convert the original data message into The message is converted into a random test data message; the continuous test data message or the random test data message is sent to the digital watt-hour meter to be tested; the digital watt-hour meter to be tested generates a measurement result to be tested, and The measurement result to be measured is sent to the host computer; The output end of the high-precision analog meter is connected to the input end of the protocol converter, and the output end of the protocol converter is connected to the upper computer; the high-precision analog meter generates a standard measurement result according to the standard source test data, and After format conversion by the protocol converter, it is sent to the host computer.