CN104360120B - Real-time waveform display method with low communication bandwidth requirement - Google Patents

Abstract

The invention discloses a real-time waveform display method with low communication bandwidth requirements. In the method, the standard reference function of the periodical time change of the recorded wave quantity of the on-site electrical quantity waveform is set in advance at the waveform receiving and waveform sending ends. When the scene at each moment When the difference between the measured recorded wave quantity of the electrical quantity waveform and the above-mentioned corresponding recorded wave quantity time-varying standard reference function value at each moment ≤ the preset error absolute value, the recorded wave sending end of the converter station control system will not send The wave recording receiving end transmits the measured wave volume of the on-site electrical quantity waveform, and the wave recording receiving end of the converter station control system performs numerical graphical display according to the preset standard reference value of the periodic time variation function of the field electric quantity wave form ; Otherwise, transmit the measured data of the wave recording, and the waveform receiving end will display the waveform according to the measured value of the wave recording received, so that the transmission of the wave data can be reduced as much as possible.

Description

Real-time Waveform Display Method with Low Communication Bandwidth Requirements

technical field

The invention relates to the technical field of waveform data transmission and display of automation equipment, in particular to a real-time waveform display method with low communication bandwidth requirements.

Background technique

At present, in the power system field, the real-time display of waveforms mainly relies on the on-site acquisition unit to collect data at high speed, and then transmit the data back to the background through the high-speed communication bus. After receiving the data, the background displays the data graphically to form a real-time waveform. Due to the large amount of waveform data and the need to complete the real-time display function, it needs to occupy a large communication bandwidth. In general, the field communication bus of the power system is multiplexed. After the real-time waveform transmission occupies a large amount of bandwidth, the normal communication function of other equipment will be affected, resulting in abnormal operation or even failure of the field power automation equipment.

Contents of the invention

The purpose of the present invention is to provide a real-time waveform display method with low communication bandwidth requirements, which can greatly reduce the communication pressure of the field bus of the power system.

To achieve this goal, the real-time waveform display method of the low communication bandwidth requirement designed by the present invention is characterized in that it comprises the following steps:

Step 1: The sampling equipment of the converter station control system obtains the measured and recorded waves of the on-site electrical waveforms that need to be displayed in the primary power equipment, power secondary equipment and power auxiliary equipment in the converter station;

Step 2: According to the equipment manufacturer's information or technical standards, obtain the standard reference for the time change of the recorded wave volume corresponding to the measured recorded wave volume of the above-mentioned on-site electric quantity waveform that needs to be displayed in the power primary equipment, power secondary equipment, and power auxiliary equipment in the converter station function, if the above-mentioned standard reference function of the time change of wave recording volume is a periodic function, then go to step 3; if the above-mentioned standard reference function of time change of wave recording volume is a non-periodic function, then go to step 4;

Step 3: Enter the above standard reference function of the periodic time change of the recorded wave volume into the wave recording sending end and the wave recording receiving end of the converter station control system, and compare the measured wave recording volume of the on-site electrical quantity waveform at each moment with the above corresponding The value of the standard reference function of the time change of the recorded wave volume at the corresponding time is compared. value ≤ preset error absolute value, the wave recording sending end of the converter station control system will not transmit the measured wave recording volume of the on-site electric quantity waveform obtained in step 1 to the wave recording receiving end, and the wave recording of the converter station control system The receiving end performs numerical graphical display according to the preset standard reference function of the periodic time change of the recorded wave volume of the on-site electric quantity waveform, and completes the real-time display function of the waveform;

If there is a difference between the measured wave volume of the on-site electrical quantity waveform at a moment and the value of the above-mentioned corresponding standard reference function of wave volume time change at the corresponding moment > the preset error absolute value, then the recorded wave volume of the converter station control system The wave sending end transmits the actual measured wave volume of the on-site electrical quantity waveform obtained in step 1 to the wave recording receiving end, and the wave recording receiving end of the converter station control system performs numerical graphics according to the received actual measured wave volume of the on-site electrical quantity waveform Real-time display function of waveform is completed;

Step 4: The wave recording sending end of the converter station control system directly transmits the measured wave recording volume of the on-site electrical quantity waveform obtained in step 1 to the wave recording receiving end, and the wave recording receiving end of the converter station control system The measured and recorded wave volume of the electrical quantity waveform is displayed numerically and graphically, and the real-time display function of the waveform is completed.

Beneficial effects of the present invention:

The present invention notices that the power system waveforms are mostly periodic variables under normal conditions, and most of them are sinusoidal waveform functions. Using this rule, corresponding to periodic variables, the wave recording period of the on-site electrical quantity waveform is set in advance at the waveform receiving and waveform sending ends. When the difference between the measured wave volume of the on-site electrical quantity waveform at each moment and the above-mentioned corresponding time-change standard reference function of wave volume ≤ the preset error absolute value , the wave recording sending end of the converter station control system does not transmit the measured wave recording volume of the on-site electrical quantity waveform to the wave recording receiving end, and the wave recording receiving end of the converter station control system follows the preset recorded wave volume of the on-site electrical quantity waveform The standard reference value of the periodic time change function is displayed numerically; when the difference between the measured wave volume of the on-site electrical quantity waveform at a moment and the value of the corresponding time change standard reference function of the recorded wave volume at the corresponding moment >predicted When the absolute value of the error is set, the transmission of the measured wave data is carried out, and the waveform receiving end displays the waveform according to the received measured value of the recorded wave, which can reduce the transmission of the waveform data as much as possible without affecting the accuracy of the waveform transmission of the power system Under the circumstances, the transmission efficiency of the power system waveform is improved, and the communication pressure of the field bus of the power system is greatly reduced.

Description of drawings

Fig. 1 is the oscillogram when comparing the value of the measured wave volume of the on-site electrical quantity waveform at each moment with the above-mentioned corresponding wave volume time variation standard reference function at each moment in the present invention;

Fig. 2 is a waveform diagram of an aperiodic function in the present invention.

detailed description

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

A method for displaying real-time waveforms with low communication bandwidth requirements, comprising the steps of:

Step 1: The sampling equipment of the converter station control system obtains the measured and recorded waves of the on-site electrical waveforms that need to be displayed in the primary power equipment, power secondary equipment and power auxiliary equipment in the converter station;

Step 2: According to the equipment manufacturer's information or technical standards, obtain the standard reference for the time change of the recorded wave volume corresponding to the measured recorded wave volume of the above-mentioned on-site electric quantity waveform that needs to be displayed in the power primary equipment, power secondary equipment, and power auxiliary equipment in the converter station function, if the above-mentioned standard reference function of the time change of wave recording volume is a periodic function, then go to step 3; if the above-mentioned standard reference function of time change of wave recording volume is a non-periodic function, then go to step 4;

Step 3: Enter the above standard reference function of the periodic time change of the recorded wave volume into the wave recording sending end and the wave recording receiving end of the converter station control system, and compare the measured wave recording volume of the on-site electrical quantity waveform at each moment with the above corresponding The value of the standard reference function of the time change of the recorded wave volume at the corresponding time is compared. value ≤ preset error absolute value (as shown in Figure 1, Figure 1 is within the error range, in field work, operators have different error requirements for different variables, some variables only need to have the same basic trend, then the preset error It can be larger, but some variable operators need to observe accurately, so the error needs to be set very small. Once the difference between the measured value and the predicted value (function calculation value) is greater than the error, the data transmission will be started), and the converter station control The wave recording sending end of the system does not transmit the measured wave recording volume of the on-site electrical quantity waveform obtained in step 1 to the wave recording receiving end, and the wave recording receiving end of the converter station control system follows the preset recorded wave volume of the on-site electrical quantity waveform The periodic time-varying standard reference function is used for numerical graphical display, and the real-time waveform display function is completed;

If there is a difference between the measured wave volume of the on-site electrical quantity waveform at a moment and the value of the above-mentioned corresponding standard reference function of wave volume time change at the corresponding moment > the preset error absolute value, then the recorded wave volume of the converter station control system The wave sending end transmits the actual measured wave volume of the on-site electrical quantity waveform obtained in step 1 to the wave recording receiving end, and the wave recording receiving end of the converter station control system performs numerical graphics according to the received actual measured wave volume of the on-site electrical quantity waveform Real-time display function of waveform is completed;

Step 4: The wave recording sending end of the converter station control system directly transmits the measured wave recording volume of the on-site electrical quantity waveform obtained in step 1 to the wave recording receiving end, and the wave recording receiving end of the converter station control system The measured and recorded wave volume of the electrical quantity waveform is displayed numerically and graphically, and the real-time display function of the waveform is completed.

In the above technical solution, the clocks of the wave recording sending end and the wave recording receiving end of the control system of the converter station are synchronized, and there is communication between them.

In the above technical solution, the measured wave recording volume of the on-site electrical quantity waveform is composed of a plurality of wave recording point data arranged in chronological order. The comparison of wave recording data refers to the comparison of single wave recording point data.

In the above technical solution, when the standard reference function of the time change of the wave recording volume is a function corresponding to the current, the absolute value of the preset error is 1 to 3 amperes; when the standard reference function of the time change of the wave recording volume is a function corresponding to the voltage , the absolute value of the preset error is 1-3 volts.

In the above technical solution, the primary power equipment in the converter station in step 1 includes circuit breakers, disconnectors and grounding switches, and the secondary power equipment includes AC and DC protection devices, measurement and control devices, fault recorders, power auxiliary equipment Including water cooling equipment, fire fighting equipment, air conditioning equipment.

In the above technical solution, the sending end of the wave recording is an electric power automation device having the function of converting the wave form quantity and sending the wave form data. The wave recording receiving end is an electric power automation equipment with wave data receiving function and wave display function.

In step 2 of the above technical solution, the measured recorded wave volume of the on-site electric quantity waveform without corresponding time-varying standard reference function of recorded wave volume is processed according to the non-periodic function, and directly goes to step 4.

In the above technical solution, the wave recording receiving end and the wave recording sending end of the converter station control system start the wave recording process at the same time, and the clock of the sending end must be consistent with the clock of the receiving end.

The content not described in detail in this specification belongs to the prior art known to those skilled in the art.

Claims (5)

1. a real-time waveform display method of low communication bandwidth requirement, is characterized in that, it comprises the steps: Step 1: The sampling equipment of the converter station control system obtains the measured and recorded waves of the on-site electrical waveforms that need to be displayed in the primary power equipment, power secondary equipment and power auxiliary equipment in the converter station; Step 2: According to the equipment manufacturer's information or technical standards, obtain the standard reference for the time change of the recorded wave volume corresponding to the measured recorded wave volume of the above-mentioned on-site electric quantity waveform that needs to be displayed in the power primary equipment, power secondary equipment, and power auxiliary equipment in the converter station function, if the above-mentioned standard reference function of the time change of wave recording volume is a periodic function, then go to step 3; if the above-mentioned standard reference function of time change of wave recording volume is a non-periodic function, then go to step 4; Step 3: Enter the above standard reference function of the periodic time change of the recorded wave volume into the wave recording sending end and the wave recording receiving end of the converter station control system, and compare the measured wave recording volume of the on-site electrical quantity waveform at each moment with the above corresponding The value of the standard reference function of the time change of the recorded wave volume at the corresponding time is compared. value ≤ preset error absolute value, the wave recording sending end of the converter station control system will not transmit the measured wave recording volume of the on-site electric quantity waveform obtained in step 1 to the wave recording receiving end, and the wave recording of the converter station control system The receiving end performs numerical graphical display according to the preset standard reference function of the periodic time change of the recorded wave volume of the on-site electric quantity waveform, and completes the real-time display function of the waveform; If there is a difference between the measured wave volume of the on-site electrical quantity waveform at a moment and the value of the above-mentioned corresponding standard reference function of wave volume time change at the corresponding moment > the preset error absolute value, then the recorded wave volume of the converter station control system The wave sending end transmits the actual measured wave volume of the on-site electrical quantity waveform obtained in step 1 to the wave recording receiving end, and the wave recording receiving end of the converter station control system performs numerical graphics according to the received actual measured wave volume of the on-site electrical quantity waveform Real-time display function of waveform is completed; Step 4: The wave recording sending end of the converter station control system directly transmits the measured wave recording volume of the on-site electrical quantity waveform obtained in step 1 to the wave recording receiving end, and the wave recording receiving end of the converter station control system The measured and recorded wave volume of the electrical quantity waveform is displayed numerically and graphically, and the real-time display function of the waveform is completed. 2. The real-time waveform display method with low communication bandwidth requirements according to claim 1, characterized in that: the measured wave recording volume of the on-site electrical quantity waveform is composed of multiple recording point data arranged in chronological order. 3. The method for displaying real-time waveforms with low communication bandwidth requirements according to claim 1, characterized in that: when the standard reference function of the time variation of the recorded wave volume is a function corresponding to the current, the absolute value of the preset error is 1～ 3 amperes, when the standard reference function of the time change of the recorded wave volume is a function corresponding to the voltage, the preset absolute value of the error is 1-3 volts. 4. The real-time waveform display method with low communication bandwidth requirements according to claim 1, characterized in that: the primary power equipment in the converter station in the step 1 includes a circuit breaker, an isolating switch and a grounding switch, and the secondary power equipment Including AC and DC protection devices, measurement and control devices, fault recorder, power auxiliary equipment including water cooling equipment, fire fighting equipment, air conditioning equipment. 5. The real-time waveform display method of low communication bandwidth requirement according to claim 1, characterized in that: in said step 2, for the actual measured wave volume of the on-site electrical quantity waveform without corresponding time-varying standard reference function of wave volume All are processed according to non-periodic functions, and go directly to step 4.