CN204855771U - Electric energy quality on -line monitoring device's test system - Google Patents

Abstract

The utility model provides a test system for an online power quality monitoring device, comprising: a host computer, a standard source, and a device to be tested; the host computer is connected to the standard source for sending test instructions to the standard source; the standard source is used for testing according to The command generates an electric energy test signal that simulates the working condition of the power grid; the device under test is connected to the standard source to detect the electric energy test signal generated by the standard source and generate electric energy monitoring data; the host computer is connected to the device under test to receive the signal sent by the device under test The electric energy monitoring data, compare the electric energy monitoring data with the electric energy test signal, and output the test result. Therefore, the technical problems of low test efficiency and inaccurate test data in the prior art are solved, real-time, fast and diversified automatic test functions are realized, and the efficiency and accuracy of the test are greatly improved.

Description

Test System of Power Quality On-line Monitoring Device

technical field

The utility model relates to electric power testing technology, in particular to a testing system for an online power quality monitoring device.

Background technique

With the rapid development of the national economy, there are more and more impactful and highly volatile loads in the power system, such as electric arc furnaces, large steel rolling mills, electric locomotives, etc. These loads are likely to cause voltage fluctuations, Power quality problems such as flicker, three-phase unbalance, swell, sag, and even interruption; in addition, with the wide application of power electronics technology, nonlinear loads in power systems are increasing, such as static converters, industrial AC-DC conversion Non-linear loads will cause distortion of the current and voltage waveforms of the power grid, resulting in serious harmonic pollution of the power grid.

In the prior art, an online power quality monitoring device is usually installed in the power system to monitor the power quality, and the online power quality monitoring device is regularly tested and calibrated. However, the test is to manually read the data of the online power quality monitoring device and compare it with the standard source data. Manual calculation errors lead to low test efficiency, single test items, large deviations in manual calculation errors, and inaccurate test data.

Therefore, there is an urgent need to develop an automatic test system for an online power quality monitoring device to improve test efficiency and improve the test quality of an online power quality monitoring device.

Utility model content

The utility model provides a test system for an online power quality monitoring device, which solves the technical problems of low test efficiency and inaccurate test data in the prior art, realizes real-time, fast and diversified automatic test functions, and greatly improves test efficiency and accuracy sex.

The utility model provides a test system for an online power quality monitoring device, comprising: a host computer, a standard source, and a device to be tested;

The host computer is connected to the standard source for sending test instructions to the standard source;

The standard source is used to generate an electric energy test signal simulating the power grid working condition according to the test instruction;

The device under test is connected to the standard source for detecting the electric energy test signal generated by the standard source to generate electric energy monitoring data;

The host computer is connected to the device under test, and is used for receiving the power monitoring data sent by the device under test, comparing the power monitoring data with the power test signal, and outputting a test result.

A network switch is also included, and the network switch is respectively connected with the host computer, at least one of the devices under test, and at least one of the standard sources.

The upper computer and the device under test include: an Ethernet communication interface based on the IEC61850 communication standard.

The test instructions include: harmonic current measurement error test, harmonic voltage measurement error test, inter-harmonic voltage measurement error test, inter-harmonic current measurement error test, fundamental frequency change influence test on harmonic voltage content rate, At least one of the test of the influence of the fundamental frequency change on the harmonic current content rate, the verification of the harmonic active power, the verification of the flicker value, and the verification of the three-phase unbalance.

The standard sources include:

Data processing unit, current/voltage amplifier;

The data processing unit communicates with the host computer, and is used to receive the test instruction sent by the host computer, analyze the test instruction, obtain test parameters, and perform digital signal processing and waveform analysis on the test parameters. Superposition and processing to form standard source waveform data;

The current/voltage amplifier is connected with the data processing unit, and is used for amplifying the power of the standard source waveform data to form and output an electric energy test signal.

The data processing unit includes: a digital signal processor DSP, a field programmable gate array FPGA circuit;

The DSP is connected in communication with the host computer, and is used for receiving the test instruction sent by the host computer, analyzing the test instruction, obtaining test parameters and performing digital signal processing on the test parameters;

The FPGA circuit is connected with the DSP, and is used for performing waveform superposition and processing on the test parameters after digital processing by the DSP to form standard source waveform data.

The test parameters include: frequency, phase, and amplitude.

The technical scheme provided by the utility model includes: an upper computer, a standard source, and a device to be tested, and connects the upper computer with the standard source, so that the standard source generates an electric energy test signal that simulates the working condition of the power grid according to the test instruction, and passes the test signal with the standard The device under test connected to the source detects the power test signal generated by the standard source, generates power monitoring data, and sends the power monitoring data to the host computer, so that the host computer compares the power monitoring data with the power test signal and outputs the test result , so as to solve the technical problems of low test efficiency and inaccurate test data in the existing technology, realize real-time, fast and diversified automatic test functions, and greatly improve the efficiency and accuracy of the test.

Description of drawings

Fig. 1 is a schematic structural diagram of a test system of an online power quality monitoring device provided by Embodiment 1 of the present invention;

Fig. 2 is a schematic structural diagram of a test system of an online power quality monitoring device provided in Embodiment 2 of the present invention;

Fig. 3 is a schematic structural diagram of the standard source provided by the third embodiment of the utility model.

Detailed ways

Fig. 1 is a schematic structural diagram of the test system of the power quality on-line monitoring device provided by Embodiment 1 of the present utility model. As shown in Fig. 2. The device under test 3; the upper computer 1 is connected to the standard source 2 for sending test instructions to the standard source 2; the standard source 2 is used to generate an electric energy test signal for simulating the power grid working condition according to the test instruction; the device under test 3 is connected to the standard source 2; The standard source 2 is connected to detect the electric energy test signal generated by the standard source 2 to generate electric energy monitoring data; the host computer 1 is connected to the device under test 3 to receive the electric energy monitoring data sent by the device under test 3, and compare the electric energy monitoring data with the The electric energy test signal is compared, and the test result is output.

Among them, the device under test 3 is an online power quality monitoring device, which is used as a front-end data acquisition device to monitor the power quality, and the accuracy of the collected and analyzed data is directly related to the analysis results of the power quality monitoring management station. The accuracy of the measures is therefore very important to the test calibration of the power quality monitoring device, that is, the device under test 3 in the utility model. Specifically, the test of the device under test 3 is realized by the test system of the power quality online monitoring device. The system is specifically: connecting the upper computer 1 with the standard source 2, connecting the standard source 2 with the device under test 3, and It is connected with the upper computer, and the connection can be connected by cable or wireless communication. The upper computer 1 is used to issue test instructions. The test instructions can flexibly compile test templates according to the requirements of the test items. The test items can be customized as electronic test programs in the form of test templates, and the function modules can be called to run in the form of templates. The test template is a module Format file for calls and parameter definitions. Based on the test template, organize the test process, define the test method, and calculate the test parameters. In a test template file, all test functions and test items of the power quality online monitoring device are defined, and necessary operation prompts are given to testers. The host computer 1 can also compare the power test signal obtained from the standard source 2 with the power monitoring data obtained from the device under test 3, automatically calculate the error, and evaluate the results to evaluate the power of the device under test 3 The quality is monitored on-line to form a qualified or exceeded conclusion, and stored as a text such as: a file in Word format is saved as a report.

The technical solution provided by this embodiment includes: a host computer, a standard source, and a device under test, and connects the host computer with the standard source so that the standard source generates an electric energy test signal simulating the working condition of the power grid according to the test instruction, and passes the test signal with the standard The device under test connected to the source detects the power test signal generated by the standard source, generates power monitoring data, and sends the power monitoring data to the host computer, so that the host computer compares the power monitoring data with the power test signal and outputs the test result , so as to solve the technical problems of low test efficiency and inaccurate test data in the existing technology, realize real-time, fast and diversified automatic test functions, and greatly improve the efficiency and accuracy of the test.

Fig. 2 is the schematic structural diagram of the test system of the electric energy quality on-line monitoring device that the utility model embodiment 2 provides, as shown in Fig. 1. At least one device under test 3 and at least one standard source 2 are connected.

Specifically, the upper computer 1 is connected to the network switch 4 through a signal line, and the network switch 4 is respectively connected to the standard source 2 and the device under test 3 through the signal line, and the upper computer 1 is connected to the network switch 4 to control the output of the standard source 2 through the signal line. 2. Output the power test signal reflecting the power quality signal to the device under test 3 for on-line monitoring of power quality. The host computer 1 connects to the network switch 4 and reads the power monitoring data reflecting the power quality signal of the device under test 3 through the signal line. Therefore, the interconnection between multiple devices under test 3 , multiple standard sources 2 and the host computer 1 can be realized through the intermediary network switch, and the test efficiency can be improved.

Further, on the basis of the above embodiments, the host computer 1 and the device under test 3 include: an Ethernet communication interface based on the IEC61850 communication standard.

Specifically, the upper computer 1 of the test system communicates with the device under test 3 through a communication interface, and the communication interface may be an interface supporting the IEC61850 communication protocol (Ethernet). The IEC61850 standard is the only universal standard in the field of power system automation.

Further, the test instructions issued by the host computer 1 may include: harmonic current measurement error test, harmonic voltage measurement error test, inter-harmonic voltage measurement error test, inter-harmonic current measurement error test, fundamental frequency change on harmonic At least one of the influence test of the wave voltage content rate, the influence test of the fundamental frequency change on the harmonic current content rate, the verification of the harmonic active power, the verification of the flicker value, and the verification of the three-phase unbalance, to enrich the test Feature and test item categories.

Fig. 3 is a schematic structural diagram of the standard source provided by Embodiment 3 of the present invention. On the basis of the above-mentioned embodiment, as shown in Fig. 3, wherein, the standard source 2 includes: a data processing unit 21, a current/voltage amplifier 22; The processing unit 21 is connected to the upper computer 1 through communication, and is used to receive the test instruction sent by the upper computer 1, analyze the test instruction, obtain the test parameters and perform digital signal processing, waveform superposition and processing on the test parameters to form standard source waveform data; The current/voltage amplifier 22 is connected with the data processing unit 21, and is used for amplifying the power of the standard source waveform data, forming and outputting an electric energy test signal.

Further, the data processing unit 21 includes: a digital signal processor (digital signal processor, referred to as "DSP") DSP211, a field programmable gate array (Field-Programmable Gate Array, referred to as "FPGA") FPGA circuit 212; It is used to receive the test instruction sent by the upper computer 1, analyze the test instruction, obtain the test parameters and perform digital signal processing on the test parameters; the FPGA circuit 212 is connected with the DSP211, and is used to superimpose the waveform of the test parameters after the digital processing by the DSP211 and processing to form standard source waveform data.

Specifically, the DSP211 receives the test instruction from the host computer 1, and parses the instruction to obtain the test parameters. The test parameters include the frequency, phase, and amplitude of the current/voltage signal. Among them, DSP211 can be connected with the level conversion chip through 8-bit data signal and 4-bit control signal; the 4-bit control signal is respectively connected to the HCNTL0, HCNTL1, HBIL, HR/W pins of DSP211. The 8-bit data signals are respectively connected to HD0 to HD7 pins of DSP211. The specific model of DSP211 can be selected by those skilled in the art according to needs, and this application does not limit it. The level conversion chip is used to convert the communication level value between DSP211 and FPGA212. DSP211 and FPGA circuit 212 are connected through 16-bit data signals and 16-bit address signals, the 16-bit data signals are respectively D0-D15 of DSP211, and the 16-bit address signals are respectively A0-A15 of DSP211, connected to the programmable gate array FPGA circuit 212 corresponding pins. The output of the FPGA circuit 212 is connected to the input terminal of the current/voltage amplifier 22 through digital-to-analog conversion, and is amplified by multi-stage current/voltage (preferably 2 stages) to obtain the final current/voltage signal, which forms the electric energy test signal and Output to the output port of standard source 2.

This embodiment further realizes a standard source with fast processing speed and accurate waveform formation through the design of the standard source, further ensuring the accuracy of the test data, and integrating the standard source into the test system of the power quality online monitoring device to realize Real-time, fast and diversified automatic testing functions greatly improve the efficiency and accuracy of testing.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand : It can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the embodiments of the present utility model Scope of technical solutions.

Claims (7)

1. A test system for a power quality on-line monitoring device, comprising: a host computer, a standard source, and a device under test; The host computer is connected to the standard source for sending test instructions to the standard source; The standard source is used to generate an electric energy test signal simulating the power grid working condition according to the test instruction; The device under test is connected to the standard source for detecting the electric energy test signal generated by the standard source to generate electric energy monitoring data; The host computer is connected to the device under test, and is used for receiving the power monitoring data sent by the device under test, comparing the power monitoring data with the power test signal, and outputting a test result. 2 . The testing system according to claim 1 , further comprising a network switch, the network switch being respectively connected to the host computer, at least one of the devices under test, and at least one of the standard sources. 3 . 3. The test system according to claim 1 or 2, wherein the host computer and the device under test comprise: an Ethernet communication interface based on the IEC61850 communication standard. 4. The test system according to claim 1, wherein the test instructions include: harmonic current measurement error test, harmonic voltage measurement error test, inter-harmonic voltage measurement error test, inter-harmonic current measurement error Test, test of influence of fundamental frequency change on harmonic voltage content rate, test of influence of fundamental frequency change on harmonic current content rate, verification of harmonic active power, verification of flicker value, verification of three-phase unbalance at least one of . 5. test system according to claim 1, is characterized in that, described standard source comprises: Data processing unit, current/voltage amplifier; The data processing unit communicates with the host computer, and is used to receive the test instruction sent by the host computer, analyze the test instruction, obtain test parameters, and perform digital signal processing and waveform analysis on the test parameters. Superposition and processing to form standard source waveform data; The current/voltage amplifier is connected with the data processing unit, and is used for amplifying the power of the standard source waveform data to form and output an electric energy test signal. 6. test system according to claim 5, is characterized in that, described data processing unit comprises: digital signal processor DSP, field programmable gate array FPGA circuit; The DSP is connected in communication with the host computer, and is used for receiving the test instruction sent by the host computer, analyzing the test instruction, obtaining test parameters and performing digital signal processing on the test parameters; The FPGA circuit is connected with the DSP, and is used for performing waveform superposition and processing on the test parameters after digital processing by the DSP to form standard source waveform data. 7. The test system according to claim 6, wherein the test parameters include: frequency, phase, and amplitude.