CN118244189B - Multi-loop direct current online monitoring method and system and electric energy equipment - Google Patents
Multi-loop direct current online monitoring method and system and electric energy equipment Download PDFInfo
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- G—PHYSICS
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Abstract
The application provides a multi-loop direct current on-line monitoring method, a system and electric energy equipment, which belong to the technical field of electric energy meters, wherein the method comprises the steps of acquiring a plurality of initial voltages and initial average voltages acquired by a plurality of direct current metering modules; determining an initial proportionality coefficient of each direct current metering module according to each initial voltage and the initial average voltage; acquiring a plurality of real-time voltages and real-time average voltages acquired by a plurality of direct current metering modules; determining a real-time proportionality coefficient of each direct current metering module according to each real-time voltage and the real-time average voltage; determining a change proportion coefficient of each direct current metering module according to the initial proportion coefficient and the real-time proportion coefficient; according to the change proportion coefficient, the voltage on-line state of each direct current metering module is determined, so that a plurality of direct current metering modules in the operation process can be monitored in real time, the workload is reduced, the monitoring efficiency is improved, and the technical problem of low monitoring efficiency caused by large workload in the traditional monitoring method is solved.
Description
Technical Field
The application belongs to the technical field of electric energy meters, and particularly relates to a multi-loop direct current on-line monitoring method, a system and electric energy equipment.
Background
In an iron tower base station system, most of electric equipment is powered by direct current, and the electric loop is more. The traditional direct current electric energy meter is in single-loop indirect access type, and a plurality of direct current electric energy meters are required to be accessed in an iron tower base station system for electric energy calculation. However, the traditional monitoring method adopts a manual inspection mode to check a plurality of accessed direct current electric energy meters one by one, so that the workload is large, and the monitoring efficiency is low.
Disclosure of Invention
The application aims to provide a multi-loop direct current online monitoring method, a system and electric energy equipment, and aims to solve the technical problem of low monitoring efficiency caused by large workload of a traditional monitoring method.
The application provides a multi-loop direct current on-line monitoring method, which comprises the following steps:
Acquiring a plurality of initial voltages and initial average voltages acquired by a plurality of direct current metering modules;
determining an initial proportionality coefficient of each direct current metering module according to each initial voltage and the initial average voltage;
Acquiring a plurality of real-time voltages and real-time average voltages acquired by a plurality of direct current metering modules;
Determining a real-time proportionality coefficient of each direct current metering module according to each real-time voltage and the real-time average voltage;
determining a change proportion coefficient of each direct current metering module according to the initial proportion coefficient and the real-time proportion coefficient;
and determining the voltage on-line state of each direct current metering module according to the change proportion coefficient.
In one embodiment, the step of determining the voltage on-line state of each of the dc metering modules according to the scaling factor includes:
And if the change proportion coefficient is larger than a first threshold value, sending a voltage alarm signal to the user side.
In one embodiment, the step of determining the voltage on-line state of each of the dc metering modules according to the scaling factor includes:
if the change proportion coefficient is larger than a second threshold value, a voltage fault signal is sent to the user side; wherein the second threshold is greater than the first threshold.
In one embodiment, the multi-loop direct current online monitoring method further comprises:
acquiring real-time alternating current and direct current and alternating current reference current acquired by each direct current metering module; wherein the real-time alternating current and direct current comprises the alternating reference current and real-time direct current;
determining a current reference amplitude of each direct current metering module according to the alternating current reference current;
Determining the current real-time amplitude of each direct current metering module according to the real-time alternating current and direct current;
determining a current amplitude error according to the current reference amplitude and the current real-time amplitude;
And determining the current on-line state of each direct current metering module according to the current amplitude error.
In one embodiment, the step of determining the current on-line status of each of the dc metering modules according to the current amplitude error includes:
And if the current amplitude error is larger than a third threshold value, sending a current alarm signal to the user side.
In one embodiment, the step of determining the current on-line status of each of the dc metering modules according to the current amplitude error further includes:
if the current amplitude error is larger than a fourth threshold value, a current fault signal is sent to a user side; wherein the fourth threshold is greater than the third threshold.
The application provides a multi-loop direct current on-line monitoring system, which comprises:
Each direct-current electric energy metering loop comprises a plurality of direct-current metering modules, and the direct-current metering modules are used for measuring electric energy of electric equipment;
The management control module is respectively connected with the plurality of direct current metering modules of each direct current electric energy metering loop and is used for acquiring a plurality of initial voltages and initial average voltages acquired by the plurality of direct current metering modules, determining an initial proportional coefficient of each direct current metering module according to each initial voltage and initial average voltage, acquiring a plurality of real-time voltages and real-time average voltages acquired by the plurality of direct current metering modules, determining a real-time proportional coefficient of each direct current metering module according to each real-time voltage and real-time average voltage, determining a change proportional coefficient of each direct current metering module according to the initial proportional coefficient and the real-time proportional coefficient, and determining the voltage on-line state of each direct current metering module according to the change proportional coefficient.
In one embodiment, each of the dc metering modules comprises:
the voltage sensing module is used for collecting the initial voltage and the real-time voltage of the electric equipment;
The alternating current signal generation module is used for generating alternating reference current;
the current sensing module is connected with the alternating current signal generating module and used for fusing the real-time direct current of the collected electric equipment with the alternating current reference current to form real-time alternating current and direct current;
The direct current control module is respectively connected with the voltage sensing module, the current sensing module and the alternating current signal generating module and is used for acquiring the initial voltage, the real-time alternating current and the alternating reference current;
The direct current control module is connected with the management control module and is used for sending the initial voltage, the real-time alternating current and the alternating reference current to the management control module;
the direct current control module is connected with the alternating current signal generation module and is also used for controlling the output frequency of the alternating current signal generation module.
In one embodiment, the management control module is further configured to obtain the real-time ac/dc current and the ac reference current, determine a current reference amplitude of each dc metering module according to the ac reference current, determine a current real-time amplitude of each dc metering module according to the real-time ac/dc current, determine a current amplitude error according to the current reference amplitude and the current real-time amplitude, and determine a current on-line state of each dc metering module according to the current amplitude error.
The application provides an electric energy device comprising the multi-loop direct current on-line monitoring system according to any one of the above embodiments.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
The initial proportional coefficient of each direct current metering module is determined through the initial voltage and the initial average voltage in the initial state, and the initial relation among the plurality of direct current metering modules is established. The voltage of each direct current metering module can be timely obtained by obtaining a plurality of real-time voltages and real-time average voltages on line in real time. And determining the real-time proportionality coefficient of each direct current metering module on the basis of the real-time voltages and the real-time average voltage, and establishing an online real-time relationship among the direct current metering modules. Furthermore, by comparing the initial proportional coefficient with the real-time proportional coefficient, the change condition of the online real-time state of each direct current metering module relative to the initial state can be obtained, the metering error of the electric energy meter is monitored in real time, and the voltage online state of each direct current metering module is further determined. The multi-loop direct current on-line monitoring method provided by the application can be used for on-line monitoring the multi-loop direct current metering module, and the intelligent low-cost on-line monitoring function of the direct current voltage channel is realized. Therefore, according to the voltage on-line state of each direct current metering module, a corresponding alarm signal or/and fault signal is sent to the background user side.
And the real-time direct current and the alternating reference current are fused to form real-time alternating current and direct current which can reflect the online real-time current of each direct current metering module. Furthermore, the amplitude calibration of the alternating current signal is realized by calculating the calculated current reference amplitude and the current real-time amplitude of the alternating current reference current and the real-time alternating current and direct current, so that the on-line monitoring of the direct current amplitude is realized without affecting the normal direct current electric energy metering function.
Therefore, by the multi-loop direct current online monitoring method and system provided by the application, the metering errors of the voltage and current of the plurality of direct current metering modules in the running process can be monitored in real time, only the direct current metering modules which send corresponding alarm signals or/and fault signals are required to be checked on site, each direct current electric energy meter which is connected one by one is not required to be checked, the workload is reduced, and the monitoring efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a multi-loop DC on-line monitoring system according to the present application;
Fig. 2 is a schematic structural diagram of a management control module provided by the present application;
FIG. 3 is a schematic diagram of a DC metering module according to the present application;
fig. 4 is a schematic structural diagram of a power module according to the present application;
FIG. 5 is a schematic diagram of a voltage sensor module according to the present application;
FIG. 6 is a schematic diagram of a current sensor module according to the present application;
fig. 7 is a schematic structural diagram of an ac signal generating module according to the present application;
Fig. 8 is a schematic structural diagram of a dc control module according to the present application;
FIG. 9 is a flowchart illustrating steps of on-line voltage monitoring in a multi-loop DC on-line monitoring method according to an embodiment of the present application;
FIG. 10 is a flowchart illustrating an online voltage monitoring step in a multi-loop DC online monitoring method according to another embodiment of the present application;
fig. 11 is a schematic flow chart of steps of on-line current monitoring in the multi-loop direct current on-line monitoring method provided by the application.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Referring to fig. 1, the present application provides a multi-loop dc on-line monitoring system. The multi-loop direct current on-line monitoring system comprises a plurality of direct current electric energy metering loops 10 and a management control module 20. Each dc power metering circuit 10 includes a plurality of dc metering modules, such as: the direct current metering module 1, the direct current metering module 2, the direct current metering module 3, the direct current metering module 4 and the like are similar to the direct current metering module n. The direct current metering module is used for measuring the electric energy of the electric equipment.
In this embodiment, the management control module 20 includes an integrated circuit chip 210 for measuring and calculating the state of charge of the battery, a first communication chip 220, a second communication chip 230, a field type liquid crystal module 240, a key module 250, a switching power supply 260, a first battery 270, a first crystal 280, and a second crystal 290, as shown in fig. 2. The integrated circuit chip 210 may be RN8217 or other chip types. The integrated circuit chip is internally provided with peripheral equipment, processing and memory which are required by the electric energy meter, and can meet the requirements of display, calculation, input, management and storage of the application.
The first communication chip 220 and the second communication chip 230 can both adopt chips capable of realizing an RS485 serial communication standard, and meet the requirements of TIA/EIA-485 standard, such as UN485E. The key module 250 employs 6 key inputs. The switching power supply 260 is a customized switching power supply, with inputs supporting 40V to 60V, outputs of 5V and 0.5A, and provides power for the entire management control module 20. An input of the switching power supply 260 is connected to an input of the incoming line 48V. The first battery 270 provides a power-down-free time function for the built-in clock, and adopts a 3V lithium battery. The first crystal 280 is a quartz crystal having an oscillation frequency of 32.76 kHz. The second crystal 290 is an active crystal having an oscillation frequency of 10 MHz.
The power supply input VCC of the integrated circuit chip 210 is connected to the +5v output of the switching power supply 260. The battery input VBAT of the integrated circuit chip 210 is connected to the output of the first battery 270. The key inputs of the integrated circuit chip 210 and the key module 250 are connected through IO. The key module 250 may be a keyboard device. The LCD interface of the integrated circuit chip 210 is connected to the field type liquid crystal module 240. The oscillator input of the integrated circuit chip 210 is connected to the first crystal 280. The clock input of the integrated circuit chip 210 is connected to the second transistor 290. The UART1 interface of the integrated circuit chip 210 is connected with the first communication chip 220, so as to realize communication with the acquisition terminal, report the electric energy data to the electric energy automatic management master station, and can also be understood as a user side. The UART2 interface of the integrated circuit chip 210 is connected with the second communication chip 230, so as to collect the electric energy information of each direct current metering module and monitor the voltage and current of each direct current metering module on line.
The direct current metering module 1, the direct current metering module 2, the direct current metering module 3 … and the direct current metering module n can realize the measurement of the electric energy of electric equipment and can realize the function of an electric energy meter. The direct current metering module 1, the direct current metering module 2, the direct current metering module 3 … and the direct current metering module n finish direct current electric energy metering of a single loop. The management control module 20 communicates with the direct current metering module 1, the direct current metering module 2, the direct current metering module 3 … and the direct current metering module n through a serial communication standard RS485, and achieves functions of display, input, management, uploading and the like. In one embodiment, the dc voltage of each dc power metering circuit 10 is input to a 48V bus, which is not limited to 48V in this embodiment, but may be other types of buses. The management control module 20 performs on-line monitoring by synchronously collecting the voltages and currents of the direct current metering module 1, the direct current metering module 2, the direct current metering module 3 … and the direct current metering module n in real time, so that display sharing, input sharing and management sharing are realized. In addition, the mode of connecting the management control module 20 with the plurality of direct-current electric energy metering loops 10 simplifies the module volume and weight of the direct-current loops, reduces the cost, is convenient to install, and avoids adopting a mode of single loop indirect access in the traditional structure.
Referring to fig. 3, in one embodiment, each dc metering module includes a voltage sensing module 111, an ac signal generating module 112, a current sensing module 113, and a dc control module 114. The voltage sensing module 111 is used for collecting an initial voltage and a real-time voltage of the electric equipment. The ac signal generating module 112 is configured to generate an ac reference current. The current sensing module is connected with the alternating current signal generating module and used for fusing the real-time direct current with the alternating reference current to form real-time alternating current and direct current. The dc control module 114 is connected to the voltage sensing module, the current sensing module, and the ac signal generating module, respectively, and is configured to obtain an initial voltage, a real-time ac/dc current, and an ac reference current. The dc control module 114 is connected to the management control module 20 for sending the initial voltage, the real-time ac/dc current, and the ac reference current to the management control module. The dc control module 114 is connected to the ac signal generating module 112, and is further configured to control an output frequency of the ac signal generating module 112.
In this embodiment, the dc metering module includes a voltage sensing module 111, an ac signal generating module 112, a current sensing module 113, a dc control module 114, and a power module 115. The power module 115 may be a custom switching power supply with inputs supporting 40V to 60V and outputs of + -5V and 0.5A or +3.3V and 0.5A, as shown in fig. 4. The power module 115 provides power for the voltage sensing module 111, the ac signal generating module 112, the current sensing module 113, and the dc control module 114.
Referring to fig. 5, in one embodiment, the voltage sensing module 111 includes a first precision resistor 1111 and a second precision resistor 1112. The resistance values of the first precision resistor 1111 and the second precision resistor 1112 can be set according to the actual application scenario. In one embodiment, the first precision resistor 1111 may be a 99kΩ,0.01% accuracy 1ppm metal film resistor of VISHAY. The second precision resistor 1112 may be a metal film resistor of VISHAY of 1kΩ,0.01% accuracy of 1 ppm. The first precision resistor 1111 and the second precision resistor 1112 form a 100:1 voltage divider for converting 48V to a small voltage of 0.48V to meet the voltage input requirements of 0 to 1V of the dc control module 114.
Referring to FIG. 6, in one embodiment, current sensing module 113 includes a TMR sensor (Tunnel Magneto Resistance Senso), which is a TMR-based through-the-heart AC/DC current sensor. The current sensing module 113 is powered by +5V, the accuracy is 0.5s, and when the current 120A is input, the current sensing module outputs 1V, so that the requirement of the maximum current 100A can be met. The output of the current sensing module 113 is 0.083V at 100A, which meets the voltage input requirements of 0 to 1V of the dc control module 114. The specific numerical values in the application are not particularly limited, and the design can be carried out according to actual conditions.
Referring to fig. 7, in one embodiment, the ac signal generating module 112 includes a direct digital frequency synthesis module (DIRECT DIGITAL SYNTHESIS, DDS) for generating an ac sinusoidal signal. In one embodiment, the frequency of the ac sinusoidal signal generated by the ac signal generating module 112 may be 50Hz, or may be other frequencies, which is not specifically limited in the present application, and may be set according to practical situations.
In one embodiment, the ac signal generation module 112 includes a direct digital frequency synthesis 1121 (which may also be referred to as a DDS module), a first capacitor 1122, a second capacitor 1123, and a third transistor 1124. The direct digital frequency synthesis 1121 may be an AD9833 model, and the model adopted in the direct digital frequency synthesis 1121 is not particularly limited in the present application, and may be selected according to actual situations. The capacitance value of the first capacitor 1122 may be 10nF, the capacitance value of the second capacitor 1123 may be 100nF, the third transistor 1124 may be an active crystal with an oscillation frequency of 10MHz, and the specific value may be designed according to the actual application scenario, which is not particularly limited in the present application.
The frequency output of the direct digital frequency synthesis 1121 may be expressed as:
(equation 1)
Where D represents a program set value, and f MCLK represents an oscillation frequency of the third transistor 1124.
The DC control module 114 sets the output frequency of the direct digital frequency synthesizer 1121 via the SPI interface. In one embodiment, the output frequency f=50 Hz of the direct digital frequency synthesis 1121, the amplitude of the output ac signal being 1V peak. Substituting f=50 Hz into equation 1, one can obtain:
(equation 2)
Wherein 0x53E represents hexadecimal numbers, converted to decimal 1342.17728.
In one embodiment, the ac signal generation module 112 further includes a transconductance power amplifier circuit 1125. The transconductance power amplifier circuit 1125 includes a power amplifier device OPA548, a dc blocking capacitor C5, a ground resistor Ra, and a feedback resistor Rb. The dc blocking capacitor C5 and the ground resistor Ra constitute a dc blocking circuit so that the ac part can be amplified. The resistance value of the feedback resistor Rb can be 10 ohms for sampling feedback of current with an accuracy of 0.02% and a temperature drift of 5ppm. If the frequency of the ac signal is 50Hz, the equivalent impedance of the blocking capacitor C5 can be expressed as:
(equation 3)
When f=50hz, the equivalent impedance xc=0.95Ω of the dc blocking capacitor C5 is negligible in the attenuation of the ac signal relative to the resistance value of 1mΩ of the ground resistance Ra. Further, the value of the output current I o of the ac signal generating module 112 can be expressed as:
(equation 4)
Where VDDS represents the ac effective value output by the direct digital frequency synthesis 1121 (which may also be referred to as a DDS module). I o is a current signal of the ac test, and the accuracy of the current signal is determined by the accuracy of the analog-digital conversion acquisition (which may also be referred to as AD acquisition) of the current sensing module 113 and the feedback resistor Rb, and the dc control module 114.
Referring to fig. 8, in one embodiment, the dc control module 114 includes a single-phase power metering SOC chip 1141, a third communication chip 1142, a second battery 1143, a fourth crystal 1144, and a fifth crystal 1145. The single-phase electric energy metering SOC chip 1141 can adopt an RN8217, is internally provided with peripheral equipment, processing and memory required by an electric energy meter, and comprises an integrated 32-bit microcontroller core, such as an ARM Cortex-M0 and a metering engine, and the working frequency of a CPU can reach 29.4912MHz. The single-phase electric energy metering SOC chip 1141 has an active error of less than 0.1% in a 5000:1 dynamic range, and a metering reference temperature coefficient value of 5ppm. The single-phase power metering SOC chip 1141 comprises 512KBytes FLASH memory and 48KBytes SRAM, and supports simultaneous measurement of zero line and fire wire dual channels. The UART of the single-phase power metering SOC chip 1141 may be set to 6 at maximum, and the serial peripheral interface (SERIAL PERIPHERAL INTERFACE, SPI) may be set to 2. The functions of acquisition, calculation and management of the direct current control module 114 can be satisfied by the single-phase electric energy metering SOC chip 1141.
In one embodiment, the third communication chip 1142 may be a chip capable of implementing an RS485 serial communication standard, meeting TIA/EIA-485 standard requirements, such as UN485E. The third communication chip 1142 is used to realize communication connection between the single-phase electric energy metering SOC chip 1141 and the management control module 20, so as to realize transmission of collected information. The second battery 1143 may provide a power-down-free time function for the built-in clock, and may be a 3V lithium battery. The fourth crystal 1144 may be a quartz crystal having an oscillation frequency of 32.76 kHz. The fifth crystal 1145 may be an active crystal having an oscillation frequency of 10 MHz. The SPI interface of the single-phase power metering SOC chip 1141 is connected to the SPI interface of the AC signal generation module 112 (which may also be understood as a DDS module). The output frequency of the DDS module is set through an SPI interface. The UP interface of the single-phase power metering SOC chip 1141 is connected with the UP interface of the voltage sensing module 111. The UN interface of the single-phase power metering SOC chip 1141 is grounded. The IAP interface of the single-phase power metering SOC chip 1141 is connected to the IAP interface of the current sensing module 113. The IAN interface of the single-phase electric energy metering SOC chip 1141 is grounded. The IBP interface of the single-phase power metering SOC chip 1141 is connected to the IO-interface of the ac signal generating module 112 (also known as the transconductance amplifier circuit 1125). The IBN interface of the single-phase power metering SOC chip 1141 is grounded. The io+ interface of the ac signal generating module 112 (also understood as the transconductance amplifier circuit 1125) passes through the current sensing module 113 together with the ac reference current output by the IO-interface and the collected real-time dc current.
In one embodiment, the management control module 20 is respectively connected to the dc metering modules of each dc power metering loop 10, and is configured to obtain a plurality of initial voltages and initial average voltages collected by the dc metering modules, determine an initial scaling factor of each dc metering module according to each initial voltage and initial average voltage, obtain a plurality of real-time voltages and real-time average voltages collected by the dc metering modules, determine a real-time scaling factor of each dc metering module according to each real-time voltage and real-time average voltage, determine a scaling factor of each dc metering module according to the initial scaling factor and the real-time scaling factor, and determine a voltage on-line state of each dc metering module according to the scaling factor.
In the present embodiment, the management control module 20 performs time synchronization with the dc metering modules 1 to n through a time synchronization command. The timing command performs timing through an End-to-End (E2E) protocol of IEEE 1588, and the accuracy is better than 0.1ms. The management control module 20 is in communication connection with the plurality of dc metering modules of each dc power metering circuit 10, so that the voltage on-line state of each dc metering module can be judged.
Referring to fig. 9, the present application provides a multi-loop dc on-line monitoring method, which includes:
S110, acquiring a plurality of initial voltages and initial average voltages acquired by a plurality of direct current metering modules;
s120, determining an initial proportionality coefficient of each direct current metering module according to each initial voltage and the initial average voltage;
S130, acquiring a plurality of real-time voltages and real-time average voltages acquired by a plurality of direct current metering modules;
S140, determining the real-time proportionality coefficient of each direct current metering module according to each real-time voltage and the real-time average voltage;
s150, determining the change proportion coefficient of each direct current metering module according to the initial proportion coefficient and the real-time proportion coefficient;
s160, determining the voltage on-line state of each direct current metering module according to the change proportion coefficient.
In this embodiment, each dc metering module collects a corresponding initial voltage. The initial voltage may be understood as an initial sampling effective value in an initial period of time calculated by the analog-to-digital converter of the single-phase power metering SOC chip 1141 inside the dc control module 114 in the dc metering module. The initial period of time may be set according to an actual application scenario, and may be 8 seconds, 9 seconds, 10 seconds, or the like, which is not particularly limited in the present application. The initial voltages U Initial initiation 1、U Initial initiation 2、U Initial initiation 3 … and U Initial initiation n collected by the DC metering modules 1,2,3 … and n in real time and synchronously are obtained online in real time through the second communication chip 230 of the management control module 20. The direct current metering module 1, the direct current metering module 2, the direct current metering module 3 … and the direct current metering module n are connected with the voltage of the same bus, and the voltage has an inherent correlation. The initial voltages corresponding to the DC metering modules represent the initial voltage states of the DC metering modules in the initial time period.
The initial average voltage U Initial average is calculated according to the plurality of initial voltages, and the relevant states of the plurality of dc metering modules in the initial period of time can be known, and the initial average voltage U Initial average can be expressed as:
(equation 5)
And calculating an initial proportional coefficient corresponding to each direct current metering module according to each initial voltage and the initial average voltage. The initial scaling factor is expressed as:
(equation 6)
Where i=1, 2,3, … … n.
At a first moment of each minute, the real-time voltages U m1、Um2、Um3 … and U mn acquired synchronously and in real time by the direct current metering module 1, the direct current metering module 2, the direct current metering module 3 … and the direct current metering module n are acquired online in real time through the second communication chip 230 of the management control module 20. m may be 1,2, or 3 … infinity, indicating a sample number per minute. The first time of each minute may be understood as the first time after the end of the initial period of time, may be determined according to the initial period of time, and may be 9 seconds, 10 seconds, 11 seconds, or the like, and the present application is not particularly limited.
According to the multiple real-time voltages U m1、Um2、Um3 … and U mn under the same sampling sequence number m, a real-time average voltage is calculated, which can be expressed as:
(equation 7)
And calculating the real-time proportionality coefficient corresponding to each direct current metering module according to each real-time voltage and the real-time average voltage. The real-time scaling factor is expressed as:
(equation 8)
Where i=1, 2,3, … … n, n represents the maximum number of dc metering modules, m=1, 2,3 … +.
According to the initial proportionality coefficient K Initial initiation i and the real-time proportionality coefficient K mi, determining a change proportionality coefficient of each direct current metering module, wherein the change proportionality coefficient K Variation of i can be expressed as:
(equation 9)
Where i=1, 2,3, … … n, n represents the maximum number of dc metering modules, m=1, 2,3 … +.
If the change proportionality coefficient K Variation of i is larger than the first threshold, the voltage of the ith direct current metering module is out of tolerance, and then a voltage alarm signal of the ith direct current metering module is sent to the user side.
In one embodiment, the first threshold may range from 0.4% to 0.6%. In one embodiment, the first threshold may be 0.5%, with 0.5% as a reference point.
If the change proportion coefficient K Variation of i is larger than the second threshold value, the fact that the voltage of the ith direct current metering module is out of tolerance is severe is indicated, and then a voltage fault signal of the ith direct current metering module is sent to the user side; wherein the second threshold is greater than the first threshold.
In one embodiment, the second threshold may range from 0.9% to 1.1%. In one embodiment, the second threshold may be 1%, with 1% as the reference point.
If the change proportionality coefficient K Variation of i is smaller than or equal to the first threshold value, the online voltage of the ith direct current metering module is indicated to be normal.
According to the multi-loop direct current online monitoring method provided by the application, the initial proportional coefficient of each direct current metering module is determined through the initial voltage and the initial average voltage in the initial state, and the initial relation among a plurality of direct current metering modules is established. The voltage of each direct current metering module can be timely obtained by obtaining a plurality of real-time voltages and real-time average voltages on line in real time. And determining the real-time proportionality coefficient of each direct current metering module on the basis of the real-time voltages and the real-time average voltage, and establishing an online real-time relationship among the direct current metering modules. Furthermore, by comparing the initial proportional coefficient with the real-time proportional coefficient, the change condition of the online real-time state of each direct current metering module relative to the initial state can be obtained, the metering error of the electric energy meter is monitored in real time, and the voltage online state of each direct current metering module is further determined. The multi-loop direct current on-line monitoring method provided by the application can be used for on-line monitoring the multi-loop direct current metering module, and the intelligent low-cost on-line monitoring function of the direct current voltage channel is realized. Therefore, according to the voltage on-line state of each direct current metering module, the first communication chip 220 of the management control module 20 sends corresponding voltage alarm signals or/and voltage fault signals to the background user side. Therefore, by the multi-loop direct current online monitoring method provided by the application, only the direct current metering module which sends out the corresponding voltage alarm signal or/and the voltage fault signal is required to be checked on site, and each accessed direct current electric energy meter is not required to be checked one by one, so that the workload is reduced, and the monitoring efficiency is improved.
Referring to fig. 10, in one embodiment, before the step of obtaining the plurality of initial voltages and the initial average voltages collected by the plurality of dc metering modules in S110, the multi-loop dc online monitoring method further includes:
S101, performing first time synchronization on a plurality of direct current metering modules;
S102, judging whether a plurality of direct current metering modules are installed and electrified for the first time;
s103, if the plurality of direct current metering modules are installed and electrified for the first time, setting an initialization mark fInit to 0, and judging whether the voltage of the plurality of direct current metering modules is stable or not;
If the voltages of the plurality of direct current metering modules are stable, executing S110 and S120, and setting an initialization flag fInit to be 1; s110, acquiring a plurality of initial voltages and initial average voltages acquired by a plurality of direct current metering modules; s120, determining an initial proportionality coefficient of each direct current metering module according to each initial voltage and the initial average voltage;
If the plurality of direct current metering modules are not powered on for the first time, S130 and S140 are executed, and the plurality of direct current metering modules are subjected to second time synchronization; s130, acquiring a plurality of real-time voltages and real-time average voltages acquired by a plurality of direct current metering modules; s140, determining the real-time proportionality coefficient of each direct current metering module according to each real-time voltage and the real-time average voltage;
s150, determining the change proportion coefficient of each direct current metering module according to the initial proportion coefficient and the real-time proportion coefficient;
S161, if the change proportion coefficient is larger than a first threshold value, sending a voltage alarm signal of the direct current metering module to a user side;
S162, if the change proportion coefficient is larger than a second threshold value, sending a voltage fault signal of the direct current metering module to the user side; wherein the second threshold is greater than the first threshold.
If the scaling factor is smaller than or equal to the first threshold, it indicates that the on-line voltage of the dc metering module is normal, and the steps S130 to S162 may be continuously and circularly executed to perform on-line monitoring in the next stage.
In this embodiment, in S101, in the first time synchronization of the dc metering modules, the time synchronization is performed on the dc metering modules 1 to n according to the E2E time synchronization protocol.
The E2E time setting protocol is used for realizing once time setting every minute, so that the synchronism of sampling is ensured, synchronous sampling of the direct current metering module 1 to the direct current metering module n can be realized in real time, and the accuracy is better than 0.1ms. The 10 seconds of data at the beginning of each minute is used as a sampling window, and the sampling resolution can be greatly improved through oversampling of 72000 points. Furthermore, the on-line monitoring function of the direct current metering modules 1 to n is realized under the condition of meeting the synchronism and the oversampling.
In S102, it is determined whether the plurality of dc metering modules are powered on for the first time, which may be understood as the first time after the on-site acceptance, or may be determined by determining whether the initialization flag fInit is 0 or 1. If the plurality of dc metering modules are powered on for the first installation, the initialization flag fInit is 0, and if not, the initialization flag fInit is 1.
In S103, whether the voltage of the dc metering modules is stable or not may be understood as waiting for a period of time after power-up, so that the dc metering modules are thermally stable, and the voltage of the dc metering modules may be ensured to be between 40V and 56V, so as to ensure that the dc metering modules work stably.
After executing S130 and S140, the plurality of dc metering modules are clocked a second time. And according to the E2E time setting protocol, the direct current metering modules 1 to n are set time at the second moment of each minute. The second time of each minute may be the 40 th second time, and may be set according to practical situations, which is not particularly limited in the present application. At the 40 th second time of each minute, the management control module 20 is used for carrying out time synchronization on the direct current metering modules 1 to n once, so that the clock of the management control module 20 and the clock of the direct current metering modules 1 to n can be ensured to be within 0.1ms, the data acquisition of 0 to 10 th seconds and the calculation of 10 th to 40 th seconds are not influenced, and enough time of 20 th seconds is also available for time synchronization communication. Furthermore, by the method in the embodiment, the direct current metering modules 1 to n can be synchronously sampled in real time, and the online monitoring function of the direct current metering modules 1 to n is accurately realized.
In one embodiment, the DC voltage signal does not affect the normal DC power metering because the DC active power cannot be generated without the AC signal. The ac signal generating module 112 (also can be understood as a DDS module) outputs an ac signal of 70.71mA, which has a small value, and the duty ratio of the ac signal of 100A to the dc signal itself is only 70.71mA/100 a=0.07% and less than 0.1%. Therefore, the dc voltage contains 0.1% of ac ripple signal, the duty ratio of the ac power is 0.1% by 0.07% =0.7 ppm, and the ac reference current has little influence on the real-time dc current compared with the level 1 (10000 ppm) dc electric energy meter. Furthermore, the multi-loop direct current on-line monitoring method provided by the application realizes on-line monitoring of current based on fusion of alternating reference current and real-time direct current.
The frequency of the output of the ac signal generating module 112 is 50Hz, i.e. the frequency of the ac reference signal is 50Hz. The chip sample rate of the single-phase power metering SOC chip 1141 in the DC control module 114 is 7.2kHz. Further, the number of samples per cycle can be expressed as:
(equation 10)
The frequency of the output of the ac signal generating module 112 may be set according to the actual application scenario, and the present application is merely illustrated, and specific values are not limited.
Referring to fig. 11, in one embodiment, the multi-loop dc online monitoring method further includes:
S210, acquiring real-time alternating current and alternating current reference current acquired by each direct current metering module; the real-time alternating current and direct current comprise alternating reference current and real-time direct current;
S220, determining a current reference amplitude value of each direct current metering module according to the alternating current reference current;
S230, determining the current real-time amplitude value of each direct current metering module according to the real-time alternating current and direct current;
S240, determining a current amplitude error according to the current reference amplitude and the current real-time amplitude;
S250, determining the current on-line state of each direct current metering module according to the current amplitude error.
In this embodiment, the ac reference current generated by the ac signal generating module 112 and the real-time dc current pass through the current sensing module 113 together to form a real-time ac/dc current, which is transmitted to the single-phase power metering SOC chip 1141 of the dc control module 114, and further transmitted to the management control module 20 through the third communication chip 1142. And the management control module 20 obtains the real-time ac/dc current and the ac reference current corresponding to each dc metering module. The alternating reference current is input into the IBP interface through sampling to form a standard IBP channel and enters the single-phase electric energy metering SOC chip 1141. The real-time alternating current and direct current are input into the IAP interface through sampling, and form a detected IAP channel to enter the single-phase electric energy metering SOC chip 1141. The real-time alternating current and direct current can directly extract alternating reference signals through orthogonal bases.
And determining the current reference amplitude of each direct current metering module according to the alternating current reference current. The current reference amplitude may be denoted as a b, and the calculation formula is as follows:
(equation 11)
Wherein, F B represents the fourier coefficient of the sampling point corresponding to the standard IBP channel, C b represents the fourier coefficient of the ac reference current, i represents the sampling point number of each cycle, and N represents the sampling point number of each cycle, which can be shown with reference to formula 10.
And determining the current real-time amplitude of each direct current metering module according to the real-time alternating current and direct current. The current real-time amplitude can be represented as a x, and the calculation formula is as follows:
(equation 12)
Wherein, F x represents the fourier coefficient of the sampling point corresponding to the IAP channel to be detected, C x represents the fourier coefficient of the fundamental wave, i represents the sampling point number of each cycle, and N represents the sampling point number of each cycle, which can be shown by referring to formula 10.
And determining a current amplitude error according to the current reference amplitude and the current real-time amplitude. The current magnitude error may be expressed as err_f, and the calculation formula is as follows:
(equation 13)
And determining the current on-line state of each direct current metering module according to the current amplitude error. And if the current amplitude error is greater than the third threshold value, sending a current alarm signal of the direct current metering module to the user side. And if the current amplitude error is greater than the fourth threshold value, sending a current fault signal of the direct current metering module to the user side. Wherein the fourth threshold is greater than the third threshold. And if the current amplitude error is smaller than or equal to the third threshold value, the current of the direct current metering module is normal.
In one embodiment, the third threshold may range from 0.4% to 0.6%. In one embodiment, the third threshold may be 0.5%, with 0.5% as a reference point.
In one embodiment, the fourth threshold may range from 0.9% to 1.1%. In one embodiment, the fourth threshold may be 1%, with 1% as the reference point.
In the multi-loop direct current online monitoring method provided by the application, the real-time direct current and the alternating reference current are fused by utilizing the orthogonality principle of the electric energy signals, so that the real-time alternating current and direct current which can reflect the online real-time current of each direct current metering module are formed. Furthermore, the amplitude calibration of the alternating current signal is realized by calculating the calculated current reference amplitude and the current real-time amplitude of the alternating current reference current and the real-time alternating current and direct current, so that the on-line monitoring of the direct current amplitude is realized without affecting the normal direct current electric energy metering function. Therefore, by the multi-loop direct current online monitoring method provided by the application, only the direct current metering module which sends out the corresponding current alarm signal or/and the current fault signal is required to be checked on site, and each accessed direct current electric energy meter is not required to be checked one by one, so that the workload is reduced, and the monitoring efficiency is improved.
Therefore, in the multi-loop direct current online monitoring system provided by the application, the management control module 20 is respectively connected with a plurality of direct current metering modules of each direct current electric energy metering loop 10, and is used for acquiring a plurality of initial voltages and initial average voltages acquired by the plurality of direct current metering modules, determining an initial proportion coefficient of each direct current metering module according to each initial voltage and initial average voltage, acquiring a plurality of real-time voltages and real-time average voltages acquired by the plurality of direct current metering modules, determining a real-time proportion coefficient of each direct current metering module according to each real-time voltage and real-time average voltage, determining a change proportion coefficient of each direct current metering module according to the initial proportion coefficient and the real-time proportion coefficient, and determining the voltage online state of each direct current metering module according to the change proportion coefficient.
The management control module 20 is further configured to obtain a real-time ac/dc current and an ac reference current, determine a current reference amplitude of each dc metering module according to the ac reference current, determine a current real-time amplitude of each dc metering module according to the real-time ac/dc current, determine a current amplitude error according to the current reference amplitude and the current real-time amplitude, and determine a current on-line state of each dc metering module according to the current amplitude error.
The management control module 20 performs time synchronization with the dc metering modules 1 to n through a time synchronization command. The time setting command performs time setting through an end-to-end mechanism E2E protocol of IEEE 1588, and the accuracy is better than 0.1ms. The management control module 20 is respectively in communication connection with a plurality of direct current metering modules of each direct current electric energy metering circuit 10, so that the judgment of the voltage and current on-line state of each direct current metering module can be realized. Furthermore, the voltage on-line state of each direct current metering module is monitored by the multi-loop direct current on-line monitoring method provided by the application, and current self-calibration is carried out on the real-time direct current on the basis that alternating reference current is injected into the DDS module in the direct current metering module. Therefore, by the multi-loop direct current online monitoring method and system provided by the application, the metering errors of the voltage and current of the plurality of direct current metering modules in the running process can be monitored in real time, only the direct current metering modules which send corresponding alarm signals or/and fault signals are required to be checked on site, each direct current electric energy meter which is connected one by one is not required to be checked, the workload is reduced, and the monitoring efficiency is improved.
The application provides electric energy equipment, which comprises the multi-loop direct current on-line monitoring system in any one of the embodiments.
In this embodiment, the electric energy device may be an instrument capable of realizing electric energy metering. The multi-loop direct current on-line monitoring system provided by the application is applied to the electric energy equipment, so that the metering error condition in the operation process can be monitored in real time on line, the normal operation of the electric energy equipment is ensured, and the working efficiency is further improved.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other manners. For example, the apparatus/terminal device embodiments described above are merely illustrative, e.g., the division of modules or units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, and the computer program may be stored in a computer readable storage medium, where the computer program, when executed by a processor, may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, executable files or in some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the content of the computer readable medium can be appropriately increased or decreased according to the requirements of the jurisdiction's jurisdiction and the patent practice, for example, in some jurisdictions, the computer readable medium does not include electrical carrier signals and telecommunication signals according to the jurisdiction and the patent practice.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (8)
1. The multi-loop direct current online monitoring method is characterized by comprising the following steps of:
acquiring a plurality of initial voltages and initial average voltages acquired by a plurality of direct current metering modules; the initial average voltage Wherein U Initial initiation i represents the ith initial voltage, and n represents the number of the direct current metering modules;
Determining an initial proportionality coefficient of each direct current metering module according to each initial voltage and the initial average voltage; wherein the initial scaling factor ；
Acquiring a plurality of real-time voltages and real-time average voltages acquired by a plurality of direct current metering modules; the real-time average voltageWherein, U mi represents the ith real-time voltage under the sampling sequence number m;
determining a real-time proportionality coefficient of each direct current metering module according to each real-time voltage and the real-time average voltage; the real-time scaling factor ；
Determining a change proportion coefficient of each direct current metering module according to the initial proportion coefficient and the real-time proportion coefficient; the coefficient of variation of the scale；
Determining the voltage on-line state of each direct current metering module according to the change proportion coefficient;
Acquiring real-time direct current acquired by each direct current metering module, and fusing the real-time direct current with alternating reference current to acquire real-time alternating current and direct current;
determining a current reference amplitude of each direct current metering module according to the alternating current reference current; the current reference amplitude a b is:
；
Wherein, C b represents the Fourier coefficient of the alternating reference current, i represents the sampling point number of each cycle, N represents the sampling point number of each cycle, and IBP (i) represents the sampling value of the alternating reference current;
Determining the current real-time amplitude of each direct current metering module according to the real-time alternating current and direct current; the current real-time amplitude A x is:
；
Wherein, C x represents the Fourier coefficient of the fundamental wave, i represents the sampling point number of each cycle, N represents the sampling point number of each cycle, IAP (i) represents the sampling value of the real-time alternating current and direct current;
determining a current amplitude error according to the current reference amplitude and the current real-time amplitude; the current amplitude error err_f is:
；
And determining the current on-line state of each direct current metering module according to the current amplitude error.
2. The multi-loop dc on-line monitoring method according to claim 1, wherein the step of determining the voltage on-line status of each of the dc metering modules according to the scaling factor comprises:
And if the change proportion coefficient is larger than a first threshold value, sending a voltage alarm signal to the user side.
3. The multi-loop direct current on-line monitoring method according to claim 2, wherein the step of determining the voltage on-line state of each of the direct current metering modules according to the scaling factor comprises:
if the change proportion coefficient is larger than a second threshold value, a voltage fault signal is sent to the user side; wherein the second threshold is greater than the first threshold.
4. The multi-loop dc on-line monitoring method of claim 1, wherein the step of determining the current on-line status of each of the dc metering modules based on the current magnitude error comprises:
And if the current amplitude error is larger than a third threshold value, sending a current alarm signal to the user side.
5. The multi-loop dc on-line monitoring method of claim 4, wherein the step of determining the current on-line status of each of the dc metering modules based on the current magnitude error further comprises:
if the current amplitude error is larger than a fourth threshold value, a current fault signal is sent to a user side; wherein the fourth threshold is greater than the third threshold.
6. A multi-loop direct current online monitoring system, comprising:
Each direct-current electric energy metering loop comprises a plurality of direct-current metering modules, and the direct-current metering modules are used for measuring electric energy of electric equipment;
The management control module is respectively connected with the plurality of direct current metering modules of each direct current electric energy metering loop and is used for acquiring a plurality of initial voltages and initial average voltages acquired by the plurality of direct current metering modules; the initial average voltage Wherein U Initial initiation i represents the ith initial voltage, and n represents the number of the direct current metering modules; determining an initial proportionality coefficient of each direct current metering module according to each initial voltage and the initial average voltage; wherein the initial scaling factor; Acquiring a plurality of real-time voltages and real-time average voltages acquired by a plurality of direct current metering modules; the real-time average voltageWherein, U mi represents the ith real-time voltage under the sampling sequence number m; determining a real-time proportionality coefficient of each direct current metering module according to each real-time voltage and the real-time average voltage; the real-time scaling factor; Determining a change proportion coefficient of each direct current metering module according to the initial proportion coefficient and the real-time proportion coefficient; the coefficient of variation of the scale; Determining the voltage on-line state of each direct current metering module according to the change proportion coefficient;
The management control module is also used for acquiring real-time direct current acquired by each direct current metering module, and fusing the real-time direct current with alternating reference current to acquire real-time alternating current and direct current; determining a current reference amplitude of each direct current metering module according to the alternating current reference current; the current reference amplitude a b is:
；
Wherein, C b represents the Fourier coefficient of the alternating reference current, i represents the sampling point number of each cycle, N represents the sampling point number of each cycle, and IBP (i) represents the sampling value of the alternating reference current;
Determining the current real-time amplitude of each direct current metering module according to the real-time alternating current and direct current; the current real-time amplitude A x is:
；
Wherein, C x represents the Fourier coefficient of the fundamental wave, i represents the sampling point number of each cycle, N represents the sampling point number of each cycle, IAP (i) represents the sampling value of the real-time alternating current and direct current;
determining a current amplitude error according to the current reference amplitude and the current real-time amplitude; the current amplitude error err_f is:
；
And determining the current on-line state of each direct current metering module according to the current amplitude error.
7. The multi-circuit direct current online monitoring system of claim 6, wherein each of the direct current metering modules comprises:
the voltage sensing module is used for collecting the initial voltage and the real-time voltage of the electric equipment;
The alternating current signal generation module is used for generating the alternating reference current;
the current sensing module is connected with the alternating current signal generating module and used for fusing the real-time direct current with the alternating reference current to form the real-time alternating current and direct current;
The direct current control module is respectively connected with the voltage sensing module, the current sensing module and the alternating current signal generating module and is used for acquiring the initial voltage, the real-time alternating current and the alternating reference current;
The direct current control module is connected with the management control module and is used for sending the initial voltage, the real-time alternating current and the alternating reference current to the management control module;
the direct current control module is connected with the alternating current signal generation module and is also used for controlling the output frequency of the alternating current signal generation module.
8. An electrical energy device comprising a multi-loop direct current on-line monitoring system according to any one of claims 6 to 7.
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| CN216870658U (en) * | 2022-01-25 | 2022-07-01 | 浙江京禾电子科技有限公司 | Be used for alternating current-direct current to mix measurement monitoring devices |
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