阅读说明：本技术 一种用于电能表测试的电网异常模拟测试系统 (Power grid abnormity simulation test system for electric energy meter test ) 是由 陈叶 曹敏 韩彤 洪志湖 朱梦梦 李博 唐标 王恩 程富勇 蒋婷婷 魏龄 刘斯 于 2020-12-02 设计创作，主要内容包括：本申请提供一种用于电能表测试的电网异常模拟测试系统,包括第一SPWM发生器、第二SPWM发生器、升流变压器、可编程衰减器、载波抄读设备、人工电源网络、频谱分析仪、标准电能表、被测电能表和PC机及软件,各个器件之间相互连接配合,模拟并分析电能质量干扰信号对所述被测电能表的影响；标准电能表用于计量输入到标准电能表中的附带电能质量信息的电压或电流信号；被测电能表用于计量输入到被测电能表中的附带电能质量信息的电压或电流信号,并与标准电能表的计量数据进行比较；PC机及软件用于设定参数以及分析被测电能表与标准电能表的计量准确度和通信性能。本申请可在实验室测试被测电能表的性能,操作更加方便,成本更低。(The application provides a power grid abnormity simulation test system for electric energy meter test, which comprises a first SPWM generator, a second SPWM generator, a current rising transformer, a programmable attenuator, a carrier wave reading device, an artificial power network, a spectrum analyzer, a standard electric energy meter, a tested electric energy meter and a PC (personal computer) and software, wherein all the devices are mutually connected and matched to simulate and analyze the influence of an electric energy quality interference signal on the tested electric energy meter; the standard electric energy meter is used for measuring a voltage or current signal with electric energy quality information input into the standard electric energy meter; the measured electric energy meter is used for measuring a voltage or current signal which is input into the measured electric energy meter and is accompanied with electric energy quality information, and comparing the voltage or current signal with the measurement data of the standard electric energy meter; and the PC and the software are used for setting parameters and analyzing the metering accuracy and the communication performance of the measured electric energy meter and the standard electric energy meter. The performance of the electric energy meter to be tested can be tested in a laboratory, the operation is more convenient, and the cost is lower.)

1. The utility model provides a power grid abnormity simulation test system for electric energy meter test which characterized in that specifically includes:

the device comprises a first SPWM generator, a second SPWM generator, an up-flow transformer, a programmable attenuator, a carrier reading device, an artificial power network, a spectrum analyzer, a standard electric energy meter, a tested electric energy meter, a PC (personal computer) and software, wherein all the devices are mutually connected and matched to simulate and analyze the influence of an electric energy quality interference signal on the tested electric energy meter;

the standard electric energy meter is used for metering a voltage or current signal with electric energy quality information input into the standard electric energy meter; the measured electric energy meter is used for measuring a voltage or current signal which is input into the measured electric energy meter and is accompanied with electric energy quality information, and comparing the voltage or current signal with the measurement data of the standard electric energy meter; and the PC and the software are used for setting parameters and analyzing the metering accuracy and the communication performance of the measured electric energy meter and the standard electric energy meter.

2. The power grid abnormality simulation test system for the electric energy meter test as claimed in claim 1, wherein the first SPWM generator is configured to convert a 600V dc voltage signal into a voltage signal accompanied with electric energy quality information, and simulate an influence of the voltage signal on the electric energy meter to be tested.

3. The power grid abnormality simulation test system for the electric energy meter test as claimed in claim 1, wherein the second SPWM generator is configured to convert a direct current voltage signal of 600V into a voltage signal with electric energy quality information, the step-up transformer is electrically connected to the second SPWM generator and configured to convert the voltage signal with electric energy quality information into a current signal with electric energy quality information, and the influence of the current signal on the tested electric energy meter is simulated.

4. The grid anomaly simulation test system for electric energy meter test according to any one of claims 1-3, wherein each of the first SPWM generator and the second SPWM generator comprises a voltage part, a current part and an MCU, the MCU is respectively connected with the voltage part and the current part for controlling phase synchronization or phase shift control between the voltage part and the current part.

5. The power grid abnormality simulation test system for the electric energy meter test according to claim 1, wherein the programmable attenuator is electrically connected with the carrier reading device and used for evaluating the communication performance of the tested electric energy meter under the electric energy quality interference signal.

6. The power grid abnormality simulation test system for the electric energy meter test as claimed in claim 5, wherein the programmable attenuator is electrically connected with the step-up transformer and is used for attenuating the current signal with the electric energy quality information according to the attenuation multiple set in the PC and the software.

7. The power grid abnormality simulation test system for the electric energy meter test according to claim 1, wherein the artificial power supply network is electrically connected with the programmable attenuator, and is used for acquiring a signal on a power grid, and the carrier reading device is electrically connected with the programmable attenuator and is used for reading data.

8. The power grid anomaly simulation test system for electric energy meter testing as claimed in claim 1, wherein said spectrum analyzer is electrically connected to said artificial power network for analyzing signals on said power grid and determining the intensity and spectral characteristics of noise and power line carrier signals.

9. The power grid abnormality simulation test system for the electric energy meter test according to claim 7 or 8, wherein the signal frequency on the power grid is in a range of 9kHz-30 MHz.

Technical Field

The application relates to the technical field of stability analysis of electric power systems, in particular to a power grid abnormity simulation test system for electric energy meter testing.

Background

The metering of the electric energy meter is the basis of the economic accounting of the power grid, and the metering precision is directly related to the economic benefit and the social benefit of both the supply and demand sides of the power system. The electric energy meter is a core part and a basic measuring tool for electric energy metering, and the metering accuracy of the electric energy meter is directly related to the precision of the electric energy metering.

With the rapid development of the industry in China, various waveforms are mixed in a low-voltage power line, and the waveforms can cause adverse effects to a certain degree on the authenticity and accuracy of electric energy metering products.

In the prior art, there are three ways to evaluate the influence of power quality on the electric energy meter: the first method is to install the electric energy meter on a site with the quality problem of the electric energy meter, the method can obtain the performance of the electric energy meter on the actual site, but the evaluation time is long, the risk caused by few electric energy quality problems can be evaluated generally, and the evaluation is not comprehensive. The second method is to adopt a programmable alternating current power supply to carry out power quality problem signals, and the method can utilize the existing equipment, but only can simulate voltage signals, can not simulate current signals, and can not evaluate the influence on power line carrier communication. And the third method is that DA is adopted to generate a signal containing the problem of power quality, the signal is amplified by a power amplifier and then is boosted by a transformer to output voltage, the method can record waveforms and generate any wave, but the design is complex, only voltage signals can be simulated, current signals cannot be simulated, and the influence on power line carrier communication cannot be evaluated.

Disclosure of Invention

The application provides a power grid abnormity simulation test system for electric energy meter test, which aims to solve the problems that the types of simulation power quality problems in the prior art are limited, the evaluation is not comprehensive, and the power line carrier communication can not be evaluated.

The application provides a power grid abnormity simulation test system for electric energy meter test specifically includes:

the device comprises a first SPWM generator, a second SPWM generator, an up-flow transformer, a programmable attenuator, a carrier reading device, an artificial power network, a spectrum analyzer, a standard electric energy meter, a tested electric energy meter, a PC (personal computer) and software, wherein all the devices are mutually connected and matched to simulate and analyze the influence of an electric energy quality interference signal on the tested electric energy meter;

the standard electric energy meter is used for metering a voltage or current signal with electric energy quality information input into the standard electric energy meter; the measured electric energy meter is used for measuring a voltage or current signal which is input into the measured electric energy meter and is accompanied with electric energy quality information, and comparing the voltage or current signal with the measurement data of the standard electric energy meter; and the PC and the software are used for setting parameters and analyzing the metering accuracy and the communication performance of the measured electric energy meter and the standard electric energy meter.

By adopting the technical scheme, the two SPWM generators are combined with the up-flow transformer, various voltage and current signals with electric energy quality information can be output to be supplied to the tested electric energy meter and the standard electric energy meter, and a user can restore the waveform recorded on site through the SPWM generators, so that inconvenience in finding problems on site is avoided; the PC and the software can realize the integration of all tests and evaluations of the tested electric energy meter and can complete the recording and playing of the field waveform.

In a preferred embodiment of the present application, the first SPWM generator is configured to convert a 600V dc voltage signal into a voltage signal with power quality information, and simulate an influence of the voltage signal on the electrical energy meter to be tested.

In the preferred embodiment of this application, the second SPWM generator is used for converting 600V's direct current voltage signal into the voltage signal of subsidiary electric energy quality information, the step-up transformer with the second SPWM generator electricity is connected for with the voltage signal of subsidiary electric energy quality information converts the current signal of subsidiary electric energy quality information into, and analog current signal is right the influence of being surveyed the electric energy meter.

In a preferred embodiment of the present application, the first SPWM generator and the second SPWM generator each include a voltage part, a current part, and an MCU connected to the voltage part and the current part, respectively, for controlling phase synchronization or phase offset control between the voltage part and the current part.

In a preferred embodiment of the present application, the programmable attenuator is electrically connected to the carrier reading device, and is configured to evaluate the communication performance of the measured electric energy meter under the electric energy quality interference signal.

In the above technical solution, the programmable attenuator is used to attenuate the carrier signal and obtain the small signal.

In a preferred embodiment of the present application, the programmable attenuator is electrically connected to the step-up transformer, and is configured to attenuate the current signal with the power quality information according to an attenuation factor set in the PC and the software.

In the above technical solution, in this embodiment, the specific value of the set attenuation multiple needs to be adjusted from small to large according to the specific application environment and the attenuator provided by the manufacturer, and then the interference test is performed.

In a preferred embodiment of the present application, the artificial power network is electrically connected to the programmable attenuator, and is configured to acquire a signal on a power grid, and the carrier reading device is electrically connected to the programmable attenuator and is configured to read data.

In a preferred embodiment of the present application, the spectrum analyzer is electrically connected to the artificial power network for analyzing signals on the power grid and determining the strength and spectral characteristics of noise and power line carrier signals.

In the preferred embodiment of the present application, the frequency of the signal on the grid is in the range of 9kHz-30 MHz.

The utility model provides a power grid abnormity simulation test system for electric energy meter test compares in prior art, has following beneficial effect:

(1) this application adopts SPWM mode simultaneous output voltage signal and current signal, can realize the simulation to multiple electric wire netting quality signal, can directly accomplish the test in the laboratory, has reduced directly to install the risk that goes wrong in the actual scene with the electric energy meter.

(2) The programmable attenuator and the carrier reading equipment are used in a matched mode, the influence of various power grid quality problems on power carrier communication can be evaluated, and the design can be changed in a targeted mode when the influence program of an electric energy quality interference signal on the communication of a tested electric energy meter is directly evaluated in a laboratory.

(3) This application adopts SPWM mode simultaneous output voltage signal and current signal, can also solve when using the alternating current source able to programme, need connect actual load, the problem that the electric energy meter just can normally work.

(4) The SPWM is adopted to synthesize the waveform, compared with the waveform synthesized by adopting a high-power amplifier, the cost is lower, and the number of the driven tested electric energy meters is more.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a block diagram of a power grid anomaly simulation test system for testing an electric energy meter according to the present application;

FIG. 2a is a schematic circuit diagram of a voltage portion in an SPWM generator circuit in a power grid anomaly simulation test system for testing an electric energy meter according to the present application;

FIG. 2b is a schematic circuit diagram of a current portion in an SPWM generator circuit in a power grid anomaly simulation test system for testing an electric energy meter according to the present application;

FIG. 3a is a schematic diagram of the waveform generated by the SPWM generator of the present application;

FIG. 3b is a waveform diagram of the SPWM generator of the present application after the low pass filter of the generated waveform.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

It should be noted that the brief descriptions of the terms in the present application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of the present application. These terms should be understood in their ordinary and customary meaning unless otherwise indicated.

The terms "first" and "second," and the like, in the description and claims of this application are used for distinguishing between similar or analogous objects or entities and are not necessarily meant to define a particular order or sequence Unless otherwise indicated (Unless otherwise indicated).

Spwm (sinussoidal pwm): a mature and widely-used PWM method synthesis technology; the SPWM changes a modulation pulse mode on the basis of PWM, and the pulse width time duty ratio is arranged according to a sine rule, so that sine wave output can be realized by output waveform through proper filtering, thereby achieving the purpose of simulating commercial power output and supplying power to an electric energy meter.

The SPWM generates a digital signal waveform as shown in fig. 3a, and generates a digital signal waveform as shown in fig. 3b through a low pass filter, it should be noted that fig. 3a and 3b are only for explaining the shape change of the waveform subjected to the SPWM processing, and thus no specific coordinate axis is provided.

The quality of the power includes voltage interruption, frequency deviation, voltage sag, voltage rise, transient pulse, voltage fluctuation and flicker, voltage shear mark, harmonic wave, inter-harmonic wave, overvoltage, undervoltage, slow rise and slow fall, and the like.

Artificial power supply network: the device is also called a power supply impedance stabilizing network, is important electromagnetic compatibility testing equipment and is mainly used for measuring continuous disturbance voltage transmitted by a tested switching power supply to a power grid along a power supply line. The artificial power supply network provides a stable impedance for the switch power supply to be tested in a radio frequency range, isolates the switch power supply to be tested from high-frequency interference on a power grid, and then couples interference voltage to a receiver.

Examples

Referring to fig. 1, a block diagram of a power grid anomaly simulation test system for testing an electric energy meter is shown.

As shown in fig. 1, the power grid abnormality simulation test system for electric energy meter test provided by the present application specifically includes:

the device comprises a first SPWM generator, a second SPWM generator, an up-flow transformer, a programmable attenuator, a carrier reading device, an artificial power network, a spectrum analyzer, a standard electric energy meter, a tested electric energy meter, a PC (personal computer) and software, wherein all the devices are mutually connected and matched to simulate and analyze the influence of an electric energy quality interference signal on the tested electric energy meter;

the standard electric energy meter is used for metering a voltage or current signal with electric energy quality information input into the standard electric energy meter; the measured electric energy meter is used for measuring a voltage or current signal which is input into the measured electric energy meter and is accompanied with electric energy quality information, and comparing the voltage or current signal with the measurement data of the standard electric energy meter; and the PC and the software are used for setting parameters and analyzing the metering accuracy and the communication performance of the measured electric energy meter and the standard electric energy meter.

By adopting the technical scheme, the two SPWM generators are combined with the up-flow transformer, various voltage and current signals with electric energy quality information can be output to be supplied to the tested electric energy meter and the standard electric energy meter, and a user can restore the waveform recorded on site through the SPWM generators, so that inconvenience in finding problems on site is avoided; the PC and the software can realize the integration of all tests and evaluations of the tested electric energy meter and can complete the recording and playing of the field waveform.

As shown in fig. 1, in this embodiment, one end of the first SPWM generator is connected to the standard electric energy meter, the other end of the first SPWM generator is connected to the PC and the software, the first SPWM generator is electrically connected to the second SPWM generator, one end of the second SPWM generator is connected to one end of the current boosting transformer, the other end of the second SPWM generator is connected to the PC and the software, the other end of the current boosting transformer is connected to the standard electric energy meter and the measured electric energy meter, one end of the spectrum analyzer is connected to the PC and the software, the other end of the spectrum analyzer is connected to the artificial power network, the artificial power network is connected to the standard electric energy meter and the measured electric energy meter, the programmable attenuator is connected to the first SPWM generator, the current boosting transformer, the standard electric energy meter, the measured electric energy meter, the carrier wave reading device, the PC and the software, the carrier reading equipment, the tested electric energy meter and the standard electric energy meter are also electrically connected with the PC and the software, the specific connection relation is shown in figure 1, voltage L in figure 1 represents live wire voltage, voltage N represents zero line voltage, and input and output of voltage and current are shown in character marks in figure 1.

On the basis of the above embodiment, further, the first SPWM generator is configured to convert a 600V dc voltage signal into a voltage signal with power quality information, and simulate an influence of the voltage signal on the measured electric energy meter.

On the basis of the above embodiment, the second SPWM generator is configured to convert a 600V dc voltage signal into a voltage signal with power quality information, and the up-converter is electrically connected to the second SPWM generator and configured to convert the voltage signal with power quality information into a current signal with power quality information, so as to simulate an influence of the current signal on the electric energy meter to be measured.

It should be noted that, in this embodiment, as shown in fig. 1, the first SPWM generator (voltage) in fig. 1 and the second SPWM generator (current) in fig. 1 are phase-synchronized, as shown in fig. 1.

In this embodiment, the measurement accuracy of the measured electric energy meter under the interference can be evaluated by comparing the measured electric energy meter with the electric energy measured by the standard electric energy meter. Three sets of experimental data are used to illustrate the following table 1:

table 1: measurement of measurement accuracy

As shown in fig. 2a and 2b, in this embodiment, each of the first SPWM generator and the second SPWM generator includes a voltage part, a current part, and an MCU, and the MCU is connected to the voltage part and the current part respectively, and is used to control phase synchronization or phase shift control between the voltage part and the current part.

Further, as shown in fig. 2a, the voltage part of the SPWM generator mainly includes a MOS transistor driving circuit (U1, U2), a driving H-bridge circuit (Q1, Q2, Q3, Q4), a low pass filter (L1, C6), the MCU controls the MOS transistor driving circuit and the driving H-bridge circuit to synthesize a SPWM voltage signal from a 600V dc voltage by the SPWM technique, and the SPWM voltage signal is converted into a sine wave voltage signal with power quality information by the low pass filter; as shown in fig. 2b, the current portion of the SPWM generator mainly includes a MOS transistor driving circuit (U3, U4), a driving H-bridge circuit (Q5, Q6, Q7, Q8), a low pass filter (L2, C17) and an inverter booster T1, the MCU controls the MOS transistor driving circuit and the driving H-bridge circuit to synthesize an SPWM voltage signal from a 600V dc voltage by SPWM technique, and convert the SPWM voltage signal into a sine wave voltage signal with power quality information through the low pass filter, and convert the sine wave voltage signal into a current signal of several tens of amperes through a boost transformer T1, and other auxiliary components in the schematic diagram of the SPWM generator circuit are not described herein.

On the basis of the above embodiment, further, the programmable attenuator is electrically connected to the carrier reading device and is used for evaluating the communication performance of the measured electric energy meter under the electric energy quality interference signal.

In the above technical solution, the programmable attenuator is used to attenuate the carrier signal and obtain the small signal.

In this embodiment, the communication performance test results of the measured electric energy meter are shown in table 2 below:

table 2: communication interference testing

In addition to the above embodiment, the programmable attenuator is electrically connected to the step-up transformer, and attenuates the current signal with the power quality information according to an attenuation factor set in the PC or software.

In this embodiment, the specific value of the set attenuation factor needs to be adjusted from small to large according to the specific application environment and the attenuator provided by the manufacturer, and then the interference test is performed.

In this embodiment, further, the artificial power network is electrically connected to the programmable attenuator, and is configured to obtain a signal on a power grid, and the carrier reading device is electrically connected to the programmable attenuator and is configured to read data.

In this embodiment, the spectrum analyzer is electrically connected to the artificial power network, and is configured to analyze signals on the power network and determine the strength and spectrum characteristics of noise and power line carrier signals.

In this embodiment, further, the frequency range of the signal on the power grid is 9kHz-30 MHz.

The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.