Electric energy quality comprehensive treatment device test system and use method thereof

Abstract

The invention discloses an electric energy quality comprehensive treatment device test system and a use method thereof, and relates to the technical field of electric energy quality test, the system comprises automatic test software, a simulation grid power supply, an active directional harmonic / reactive generator, a fault ride-through device, a data acquisition device, a current and voltage sensor and a power analyzer; according to the invention, automatic test software is introduced into the test system to realize centralized automatic control of equipment such as a simulated power grid power supply and a data acquisition device, and different from the traditional manual control mode of each equipment, the software automatically issues instructions and adjusts parameters according to a preset program without frequent manual intervention, and the test efficiency is greatly improved in various test processes. An operator only needs to set key parameters, the system can automatically execute according to the process, test condition setting, data collection and analysis processing are completed in one step, the test efficiency is greatly improved, and the problem that a traditional test mode is large in manpower consumption and time consumption is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power quality testing, and in particular to a power quality comprehensive management device testing system and a use method thereof. Background Art

[0002] Power quality comprehensive management devices play a vital role in modern power systems. Such devices are mainly used on the distribution user side. Their core functions are to manage three-phase current imbalance, improve the condition of low phase voltage and compensate for reactive power, thereby achieving the purpose of optimizing power quality. In order to ensure that the power quality comprehensive management devices can play their due performance in actual applications, comprehensive and rigorous testing is an indispensable link. On the one hand, accurate evaluation of the performance indicators of the device, such as unbalanced current compensation capability, harmonic current suppression effect, stability under constant voltage mode and fault ride-through capability, helps to determine whether the device meets the design requirements and industry standards. Only when the devices that meet the performance standards are put into use can the power quality problems in the power system be effectively solved. On the other hand, testing can also discover potential defects and deficiencies in the design and manufacturing process of the device, provide a strong basis for product optimization and improvement, and promote the continuous development of power quality comprehensive management technology.

[0003] However, the traditional power quality comprehensive management device test system has certain defects when in use. In the past, it was necessary to separately control multiple devices such as the simulated grid power supply, data acquisition device, fault ride-through device, active reactive power / harmonic generator, etc. During the test process, it is necessary to wait for the device under test to reach the specified power, and then control the power analysis for data storage. After the storage is completed, the data needs to be manually exported and secondary processing and analysis is performed. This method not only has a cumbersome operation process and consumes a lot of manpower and time, but also in the data sorting process, due to the complicated data processing, the test cycle is further increased. At the same time, traditional testing requires manual setting of a large number of parameters and a large number of test points. Each test point needs to be re-set with cumbersome parameters. There are many repetitive tasks and it is easy to have human errors, which affect the accuracy and reliability of the test results. Therefore, it is of great significance to develop a power quality comprehensive management device test system and its use method. Summary of the invention

[0004] The purpose of the present invention is to make up for the shortcomings of the prior art and provide a test system for a comprehensive power quality management device and a method for using the same. The system can introduce automatic testing software into the test system to realize centralized and automated control of various equipment such as simulated power grid power supplies and data acquisition devices. During various test processes, the operator only needs to set key parameters, and the system can automatically execute according to the process, thereby greatly improving the test efficiency and effectively solving the problem of high manpower and time consumption in traditional test modes.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a test system for a comprehensive power quality control device and a method for using the same, the system comprising: automatic test software, a simulated grid power supply, an active directional harmonic / reactive power generator, a fault ride-through device, a data acquisition device, a current and voltage sensor, and a power analyzer;

[0006] The automatic test software is used to collect and issue instructions to the simulated power grid, the active directional harmonic / reactive generator, the fault ride-through device, and the data acquisition device, and to issue corresponding voltage, current, and power data to the simulated power grid, the active directional harmonic / reactive generator, and the fault ride-through device, and to collect data fed back by the power analyzer;

[0007] The current and voltage sensors are used to collect AC and DC analog power transmission signals and transmit them to the power analyzer;

[0008] The power analyzer is used to analyze the signals collected by the current and voltage sensors;

[0009] During the test, the automatic test software calculates the test parameter adjustment value according to the parameter adjustment formula. The parameter adjustment formula is: ΔP = k1 × (P t -P c )×f(t),ΔU=k2×(U t -U c )×g(t), ΔP is the power adjustment value, P t is the target power, P c is the current power, k1 is the power adjustment coefficient, f(t) is the power adjustment function that changes with time, ΔU is the voltage adjustment value, U t is the target voltage, U c is the current voltage, k2 is the voltage adjustment coefficient, and g(t) is the voltage adjustment function that changes with time.

[0010] Furthermore, the automatic test software performs the following operations during the unbalanced current compensation test:

[0011] Set the voltage, frequency and phase of the simulated grid power supply, and set the active directional harmonic / reactive source to output unbalanced current, with the proportions being 30%, 50% and 90% respectively;

[0012] Start the power quality comprehensive management device to start compensation, wait for the equipment under test to run stably, and collect 3 minutes of data from the data acquisition device;

[0013] Determine whether all power measurement points have completed the test. If not, continue to test the unfinished measurement points. If all measurement points are completed, perform subsequent processing. During this process, the automatic test software uses parameter adjustment formulas to calculate the power and voltage adjustment values ​​based on the collected current power and voltage data, combined with the target power and voltage, to control the output of the simulated grid power supply and active directional harmonic / reactive source.

[0014] Furthermore, the automatic test software performs the following operations during the harmonic current compensation test:

[0015] Set the voltage, frequency and phase of the simulated grid power supply, and set the active directional harmonic / reactive source output harmonic current;

[0016] Start the power quality comprehensive management device to start compensation, wait for the equipment under test to stabilize, and collect 3 minutes of data from the data acquisition device;

[0017] Check the completion status of all power measurement points. If not all are completed, continue to complete the remaining measurement points. If all are completed, perform subsequent processing. During this test process, the automatic test software adjusts the test parameters based on the parameter adjustment formula.

[0018] Furthermore, the automatic test software performs the following operations when testing in constant voltage mode:

[0019] Control CB1 and CB3 to close, CB2 to open, set the voltage, frequency and phase of the simulated grid power supply, set the power quality comprehensive management device to constant voltage control mode, and set the voltage to 100%Un;

[0020] Set the simulated grid power supply voltage to 95%Un / 105%Un, delay for 1 minute to wait for the equipment under test to run stably, and collect data for 3 minutes from the data acquisition device;

[0021] Determine whether all test points are completed. If not, continue testing. If completed, perform subsequent processing. In the constant voltage mode test, the automatic test software uses the parameter adjustment formula to control the test process.

[0022] Furthermore, the automatic test software performs the following operations during the fault ride-through test:

[0023] Control CB2 to close, CB1 and CB3 to open, start the simulated grid power supply, fault ride-through device and power quality comprehensive management device in sequence, and start the fault ride-through function of the power quality comprehensive management device;

[0024] Delay 1-5 minutes to wait for the output power of the comprehensive power quality management device to stabilize, adjust the voltage drop percentage of the fault ride-through device (low-level wear 90%, 80%, 60%, 40%, 20%, 0%, high-level wear 110%, 120%, 130%) and the drop maintenance time 150ms, and collect relevant data from the data acquisition equipment;

[0025] Determine whether both high voltage ride-through and low voltage ride-through are completed. If not, continue testing. If both are completed, perform subsequent processing. During the fault ride-through test, the automatic test software uses parameter adjustment formulas to optimize the test process.

[0026] Furthermore, the automatic test software performs preprocessing on the collected raw data during the data collection process. The preprocessing includes data filtering and data denoising. The data filtering adopts an algorithm based on the combination of wavelet transform and adaptive threshold adjustment. The formula is: Among them, y(n) is the filtered data, x(n) is the original collected data, h(m) is the filter coefficient, N is the filter window length, λ is the adaptive threshold, sgn(x(n)) is the sign function, and data denoising uses a deep learning-based denoising model to remove noise in the data. The preprocessed data is then transmitted to the power analyzer for analysis and processing.

[0027] Furthermore, in the data filtering process based on wavelet transform and adaptive threshold adjustment, the automatic test software dynamically adjusts the filter coefficient h(m) and the adaptive threshold λ according to the frequency characteristics and amplitude changes of the collected data, calculates the energy concentration frequency band of the data by real-time monitoring of the spectrum distribution of the collected data, adjusts the filter coefficient according to the difference between the energy concentration frequency band and the preset standard frequency band, and adjusts the adaptive threshold according to the amplitude change range of the data.

[0028] Furthermore, the simulated grid power supply includes a voltage generating module, a voltage regulating module and a voltage output module. The voltage generating module is used to generate an initial analog voltage signal, and adopts a method based on a combination of digital signal processing DSP technology and direct digital frequency synthesis DDS technology. The voltage regulating module is used to adjust the generated analog voltage signal, and the voltage output module is used to output the adjusted analog voltage signal to the test loop.

[0029] Furthermore, the voltage regulation module adopts a closed-loop feedback regulation method, and adjusts it using a proportional-integral-differential control algorithm by comparing the deviation between the actual voltage value output by the voltage output module and the target voltage value. During the adjustment process, the automatic testing software dynamically adjusts the proportional coefficient, integral coefficient and differential coefficient according to the requirements for voltage regulation in different test scenarios.

[0030] A method for using a power quality comprehensive management device test system is applicable to the above-mentioned power quality comprehensive management device test system, and the method comprises the following steps:

[0031] Initialize the test system to ensure normal communication between the automatic test software, simulated grid power supply, active directional harmonic / var generator, fault ride-through device, data acquisition device, current and voltage sensors, and power analyzer;

[0032] Select the corresponding test type according to the test requirements, including unbalanced current compensation test, harmonic current compensation test, constant voltage mode test and fault ride-through test;

[0033] For the selected test type, set the corresponding parameters according to the operating procedures of the test system;

[0034] Start the test, the automatic test software controls each device to work together according to the preset test process, and adjusts the test parameters according to the parameter adjustment formula;

[0035] During the test, the automatic test software collects the data fed back by the power analyzer in real time, and processes and analyzes the data;

[0036] After the test is completed, the automatic test software generates a test report based on the processed data.

[0037] Compared with the prior art, the power quality comprehensive management device test system and its use method have the following beneficial effects:

[0038] 1. The present invention realizes centralized and automated control of various devices such as simulated power grid power supplies and data acquisition devices by introducing automatic testing software into the test system. Different from the traditional manual control of each device separately, the software automatically issues instructions and adjusts parameters according to preset programs without frequent human intervention. In various test processes, the operator only needs to set key parameters, and the system can automatically execute according to the process, from setting test conditions, collecting data to analyzing and processing, all in one go, achieving a significant improvement in test efficiency and effectively solving the problem of high manpower and time consumption in traditional test modes.

[0039] 2. The present invention achieves a significant improvement in the quality of test data through the in-depth processing of collected data by automatic test software and the coordinated optimization of various components of the system. The automatic test software can not only accurately collect data, but also use innovative algorithms to perform pre-processing such as filtering and denoising on the data to reduce interference. In terms of test parameter adjustment, a unique formula is used to achieve dynamic and precise regulation to ensure stable test conditions. Compared with the errors that are prone to occur in traditional manual operations, this system effectively avoids the influence of human factors on the data and provides more reliable and accurate data support for the performance evaluation of comprehensive power quality management devices.

[0040] Other advantages, objectives and features of the present invention will be set forth in part in the following description and, in part, will be apparent to those skilled in the art based on an examination of the following or may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 It is a structural block diagram of a test system for a comprehensive power quality control device;

[0043] Figure 2 is a flow chart of the unbalanced current compensation test in the present invention;

[0044] Figure 3 This is a flow chart of the harmonic current compensation test in the present invention;

[0045] Figure 4 This is a flow chart of the constant voltage mode test in the present invention;

[0046] Figure 5 This is a flow chart of the fault ride-through test in the present invention. DETAILED DESCRIPTION

[0047] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0048] Embodiment 1

[0049] In a modern large-scale commercial complex, there are various business formats such as shopping malls, hotels, and office buildings. The number of various electrical equipment is huge and the operation mode is complex. The commercial complex has purchased a batch of comprehensive power quality management devices, which need to be comprehensively and rigorously tested before being put into use.

[0050] In this test, a comprehensive power quality management device test system was used. The system consists of automatic test software, simulated grid power supply, active directional harmonic / reactive generator, fault ride-through device, data acquisition device, current and voltage sensors, and power analyzer. Before the test, technicians carefully checked and ensured smooth communication between the devices, the automatic test software was able to stably collect and issue instructions, the current and voltage sensors accurately collected signals and transmitted them to the power analyzer, and the power analyzer was able to analyze and process data normally.

[0051] First, an unbalanced current compensation test is carried out. The technicians use the automatic testing software to set the voltage, frequency and phase of the simulated grid power supply. The voltage generation module of the simulated grid power supply adopts a combination of digital signal processing (DSP) technology and direct digital frequency synthesis (DDS) technology to generate the corresponding analog voltage signal according to a specific formula.

[0052] Next, the active directional harmonic / reactive source output unbalanced current is set to 30%, 50%, and 90% respectively, and the power quality comprehensive management device is started to start compensation. The automatic test software uses the formula ΔP = k1 × (P t -P c )×f(t),ΔU=k2×(U t -U c )×g(t), according to the current power and voltage data collected in real time, combined with the target power and voltage, the power and voltage adjustment values ​​are calculated, and then the output of the simulated grid power supply and the active directional harmonic / reactive source are accurately controlled. After a period of delay, after waiting for the equipment under test to run stably, 3 minutes of data are collected from the data acquisition device, and then all power measurement points are checked. If there are measurement points that have not been tested, the test of the remaining measurement points will be completed. If all measurement points have been completed, the next test link will be entered.

[0053] Next is the harmonic current compensation test. The automatic test software sets the voltage, frequency and phase of the simulated grid power supply again, and sets the active directional harmonic / reactive source to output harmonic current. The comprehensive power quality management device is started to start compensation. The automatic test software uses the above formula to adjust the test parameters in real time. After a delay to wait for the device under test to stabilize, 3 minutes of data is collected from the data acquisition device. After completing the data collection, check the completion status of all power measurement points. If there are any unfinished points, continue to complete the remaining measurement point tests. If all are completed, enter the constant voltage mode test.

[0054] In the constant voltage mode test, the automatic test software controls the relevant switches to close CB1 and CB3 and disconnect CB2, and sets the voltage, frequency and phase of the simulated power grid again, sets the power quality comprehensive management device to the constant voltage control mode, and sets the voltage to 100% Un. After that, the simulated power grid voltage is set to 95% Un / 105% Un. The automatic test software uses the above formula to finely control the test process, delays for 1 minute, waits for the equipment under test to run stably, collects 3 minutes of data from the data acquisition device, and then checks whether all measurement points are completed. If not, continue the test. If completed, perform a fault ride-through test.

[0055] The fault ride-through test begins, and the automatic test software controls CB2 to close, and CB1 and CB3 to disconnect. Start the simulated grid power supply, fault ride-through device, and power quality integrated management device in sequence, and turn on the fault ride-through function of the power quality integrated management device. After a delay of 1 to 5 minutes, wait for the output power of the power quality integrated management device to stabilize, collect relevant data from the data acquisition device, and determine whether the high voltage ride-through and low voltage ride-through have been completed. If not, adjust the voltage drop percentage of the fault ride-through device (low voltage ride-through 90%, 80%, 60%, 40%, 20%, 0%, high voltage ride-through 110%, 120%, 130%) and the drop maintenance time 150ms, and continue the test; if all are completed, enter the data processing and report generation stage.

[0056] During the entire test process, the automatic test software continuously collects data fed back by the power analyzer in real time. At the same time, the automatic test software pre-processes the collected raw data. The data filtering adopts an algorithm based on wavelet transform and adaptive threshold adjustment. The formula is: Data denoising uses a noise reduction model based on deep learning. The preprocessed data is then transmitted to the power analyzer for analysis and processing. The automatic testing software generates a detailed test report based on the processed data and relevant standards.

[0057] After the test, the technicians clean and maintain the test system according to the established process to ensure that the system is ready for the next test at any time and always maintains good operating condition.

[0058] In summary, through this comprehensive test, the test system has realized an automated test process, greatly improved the test efficiency, and significantly saved manpower and time costs compared to traditional testing methods. Technicians can accurately judge whether the comprehensive power quality management device can meet the actual needs of the commercial complex, providing solid data support for the subsequent solution of the power quality problems of the commercial complex, and effectively avoiding equipment failures and operational losses caused by poor device performance.

[0059] Embodiment 2

[0060] In a remote wind farm, there are a large number of wind turbines. Due to the instability of wind resources and the influence of natural environment, equipment aging and other factors during the operation of wind power equipment, the quality of electric energy output by the power farm is poor. The power farm has purchased a batch of comprehensive power quality management devices. These devices must be strictly tested before being put into use.

[0061] The test used a comprehensive power quality management device test system, which consists of automatic test software, simulated grid power supply, active directional harmonic / reactive generator, fault ride-through device, data acquisition device, current and voltage sensors, and power analyzer. Before the test, the technicians thoroughly checked the system to ensure that the communication between the devices was normal, the automatic test software could accurately collect and issue instructions, the current and voltage sensors could accurately collect signals and transmit them to the power analyzer, and the power analyzer could also analyze and process data normally.

[0062] First, an unbalanced current compensation test is carried out. The technicians use automatic testing software to set the voltage, frequency and phase of the simulated grid power supply. The voltage generation module of the simulated grid power supply generates an analog voltage signal according to a specific formula by combining digital signal processing (DSP) technology and direct digital frequency synthesis (DDS) technology.

[0063] Next, the active directional harmonic / reactive source output unbalanced current is set to 30%, 50%, and 90% respectively, and the power quality comprehensive management device is started to start compensation. The automatic test software uses the formula ΔP = k1 × (P t -P c )×f(t),ΔU=k2×(U t -U c )×g(t), calculate the power and voltage adjustment values ​​according to the current power and voltage data collected in real time, combined with the target power and voltage, so as to accurately control the output of the simulated grid power supply and the active directional harmonic / reactive source. After an appropriate delay, wait for the equipment under test to run stably, collect 3 minutes of data from the data acquisition device, and then check all power measurement points. If there are any measurement points that have not been tested, continue to complete the test of the remaining measurement points; if all measurement points are completed, enter the harmonic current compensation test link.

[0064] During the harmonic current compensation test phase, the automatic test software resets the voltage, frequency and phase of the simulated grid power supply, sets the active directional harmonic / reactive source to output harmonic current, starts the comprehensive power quality management device to start compensation, and uses the above formula to adjust the test parameters in real time. After a delay to wait for the device under test to stabilize, it collects 3 minutes of data from the data acquisition device. After the collection is completed, check the completion status of all power measurement points. If there are any unfinished points, continue to complete the remaining measurement point tests. If all are completed, enter the constant voltage mode test.

[0065] The constant voltage mode test starts, and the automatic test software controls the relevant switches to close CB1 and CB3 and disconnect CB2. The voltage, frequency and phase of the simulated grid power supply are set again, and the power quality comprehensive management device is set to the constant voltage control mode. The voltage is set to 100% Un. After that, the simulated grid power supply voltage is set to 95% Un105% Un. The automatic test software uses the above formula to finely control the test process, delays for 1 minute, waits for the equipment under test to run stably, collects 3 minutes of data from the data acquisition device, and then checks whether all measurement points are completed. If not, continue the test. If completed, perform a fault ride-through test.

[0066] During the fault ride-through test, the automatic test software controls CB2 to close, and CB1 and CB3 to disconnect. Start the simulated grid power supply, fault ride-through device and power quality comprehensive management device in sequence, and turn on the fault ride-through function of the power quality comprehensive management device. After a delay of 1 to 5 minutes, wait for the output power of the power quality comprehensive management device to stabilize, collect relevant data from the data acquisition device, and determine whether the high voltage ride-through and low voltage ride-through have been completed. If not, adjust the voltage drop percentage of the fault ride-through device (low voltage ride-through 90%, 80%, 60%, 40%, 20%, 0%, high voltage ride-through 110%, 120%, 130%) and the drop maintenance time 150ms, and continue the test; if all are completed, enter the data processing and report generation stage.

[0067] During the entire test process, the automatic test software continuously collects data fed back by the power analyzer in real time. At the same time, the automatic test software pre-processes the collected raw data. The data filtering adopts an algorithm based on wavelet transform and adaptive threshold adjustment. The formula is: Data denoising uses a noise reduction model based on deep learning. The pre-processed data is then transmitted to the power analyzer for analysis and processing. The automatic test software generates a detailed test report based on the processed data and relevant standards.

[0068] After the test, the technicians clean and maintain the test system according to standard procedures to ensure that the system is ready for the next test at any time and always maintains a good operating condition.

[0069] In summary, through this comprehensive test, the test system has realized a fully automated test process, greatly improved the test efficiency, and greatly saved manpower and time costs compared with traditional testing methods. Technicians can accurately judge whether the comprehensive power quality management device can meet the actual needs of the wind farm, and provide strong data support for the subsequent improvement of the power quality of the power farm and the stability of power grid connection.

[0070] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A test system for a comprehensive power quality control device, characterized in that: The system includes: automatic test software, simulated grid power supply, active directional harmonic / var generator, fault ride-through device, data acquisition device, current and voltage sensors and power analyzer; The automatic test software is used to collect and issue instructions to the simulated power grid, the active directional harmonic / reactive generator, the fault ride-through device, and the data acquisition device, and to issue corresponding voltage, current, and power data to the simulated power grid, the active directional harmonic / reactive generator, and the fault ride-through device, and to collect data fed back by the power analyzer; The current and voltage sensors are used to collect AC and DC analog power transmission signals and transmit them to the power analyzer; The power analyzer is used to analyze the signals collected by the current and voltage sensors; During the test, the automatic test software calculates the test parameter adjustment value according to the parameter adjustment formula. The parameter adjustment formula is: ΔP = k1 × (P t -P c )×f(t),ΔU=k2×(U t -U c )×g(t), ΔP is the power adjustment value, P t is the target power, P c is the current power, k1 is the power adjustment coefficient, f(t) is the power adjustment function that changes with time, ΔU is the voltage adjustment value, U t is the target voltage, U c is the current voltage, k2 is the voltage adjustment coefficient, and g(t) is the voltage adjustment function that changes with time.

2. A power quality comprehensive management device test system according to claim 1, characterized in that: The automatic test software performs the following operations during the unbalanced current compensation test: Set the voltage, frequency and phase of the simulated grid power supply, and set the active directional harmonic / reactive source to output unbalanced current, with the proportions being 30%, 50% and 90% respectively; Start the power quality comprehensive management device to start compensation, wait for the equipment under test to run stably, and collect 3 minutes of data from the data acquisition device; Determine whether all power measurement points have completed the test. If not, continue to test the unfinished measurement points. If all measurement points are completed, perform subsequent processing. During this process, the automatic test software uses parameter adjustment formulas to calculate the power and voltage adjustment values ​​based on the collected current power and voltage data, combined with the target power and voltage, to control the output of the simulated grid power supply and active directional harmonic / reactive source.

3. The power quality comprehensive management device test system according to claim 1, characterized in that: The automatic test software performs the following operations during the harmonic current compensation test: Set the voltage, frequency and phase of the simulated grid power supply, and set the active directional harmonic / reactive source output harmonic current; Start the power quality comprehensive management device to start compensation, wait for the equipment under test to stabilize, and collect 3 minutes of data from the data acquisition device; Check the completion status of all power measurement points. If not all are completed, continue to complete the remaining measurement points. If all are completed, proceed to subsequent processing. During this test process, the automatic test software adjusts the test parameters based on the parameter adjustment formula.

4. The power quality comprehensive management device test system according to claim 1, characterized in that: The automatic test software performs the following operations when testing in constant voltage mode: Control CB1 and CB3 to close, CB2 to open, set the voltage, frequency and phase of the simulated grid power supply, set the power quality comprehensive management device to constant voltage control mode, and set the voltage to 100%Un; Set the simulated grid power supply voltage to 95%Un / 105%Un, delay for 1 minute to wait for the equipment under test to run stably, and collect data for 3 minutes from the data acquisition device; Determine whether all test points are completed. If not, continue testing. If completed, perform subsequent processing. In the constant voltage mode test, the automatic test software uses the parameter adjustment formula to control the test process.

5. The power quality comprehensive management device test system according to claim 1, characterized in that: The automatic test software performs the following operations during the fault ride-through test: Control CB2 to close, CB1 and CB3 to open, start the simulated grid power supply, fault ride-through device and power quality comprehensive management device in sequence, and start the fault ride-through function of the power quality comprehensive management device; Delay 1-5 minutes to wait for the output power of the comprehensive power quality management device to stabilize, adjust the voltage drop percentage of the fault ride-through device and the drop maintenance time to 150ms, and collect relevant data from the data acquisition equipment; Determine whether both high voltage ride-through and low voltage ride-through are completed. If not, continue testing. If both are completed, perform subsequent processing. During the fault ride-through test, the automatic test software uses parameter adjustment formulas to optimize the test process.

6. The power quality comprehensive management device test system according to claim 1, characterized in that: During the data collection process, the automatic test software preprocesses the collected raw data. The preprocessing includes data filtering and data denoising. The data filtering adopts an algorithm based on the combination of wavelet transform and adaptive threshold adjustment. The formula is: Among them, y(n) is the filtered data, x(n) is the original collected data, h(m) is the filter coefficient, N is the filter window length, λ is the adaptive threshold, sgn(x(n)) is the sign function, and data denoising uses a deep learning-based denoising model to remove noise in the data. The preprocessed data is then transmitted to the power analyzer for analysis and processing.

7. A power quality comprehensive management device test system according to claim 6, characterized in that: In the data filtering process based on wavelet transform and adaptive threshold adjustment, the automatic test software dynamically adjusts the filter coefficient h(m) and the adaptive threshold λ according to the frequency characteristics and amplitude changes of the collected data. By real-time monitoring of the spectrum distribution of the collected data, the energy concentration frequency band of the data is calculated, and the filter coefficient is adjusted according to the difference between the energy concentration frequency band and the preset standard frequency band. At the same time, the adaptive threshold is adjusted according to the amplitude change range of the data.

8. The power quality comprehensive management device test system according to claim 1, characterized in that: The simulated power grid power supply includes a voltage generating module, a voltage regulating module and a voltage output module. The voltage generating module is used to generate an initial analog voltage signal, and adopts a method based on a combination of digital signal processing DSP technology and direct digital frequency synthesis DDS technology. The voltage regulating module is used to regulate the generated analog voltage signal, and the voltage output module is used to output the regulated analog voltage signal to the test loop.

9. A power quality comprehensive management device test system according to claim 8, characterized in that: The voltage regulation module adopts a closed-loop feedback regulation method. By comparing the deviation between the actual voltage value output by the voltage output module and the target voltage value, the voltage regulation module uses a proportional-integral-differential control algorithm for regulation. During the regulation process, the automatic test software dynamically adjusts the proportional coefficient, integral coefficient and differential coefficient according to the requirements for voltage regulation in different test scenarios.

10. A method for using a power quality comprehensive management device test system, applicable to a power quality comprehensive management device test system according to claims 1-9, characterized in that: The method comprises the following steps: Initialize the test system to ensure normal communication between the automatic test software, simulated grid power supply, active directional harmonic / var generator, fault ride-through device, data acquisition device, current and voltage sensors, and power analyzer; Select the corresponding test type according to the test requirements, including unbalanced current compensation test, harmonic current compensation test, constant voltage mode test and fault ride-through test; For the selected test type, set the corresponding parameters according to the operating procedures of the test system; Start the test, the automatic test software controls each device to work together according to the preset test process, and adjusts the test parameters according to the parameter adjustment formula; During the test, the automatic test software collects the data fed back by the power analyzer in real time, and processes and analyzes the data; After the test is completed, the automatic test software generates a test report based on the processed data.

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