Test system and test method for electric energy quality control device

Abstract

The invention provides a test system and a test method for an electric energy quality control device. The test system comprises a power grid simulation unit, a power generation unit, a power utilization unit and a test unit. The power grid simulation unit provides voltage source type disturbance and voltage drop disturbance, the power generation unit and the power utilization unit provide current source type disturbance, and then the treatment effect is tested through the test unit. According to the application, the voltage source type disturbance and the current source type disturbance are combined, the voltage drop disturbance is also considered, the real scene of the power grid can be simulated, the treatment effect of the electric energy quality treatment device on the electric energy quality is not influenced, and the test reliability of the test system can also be improved. After the voltage source type disturbance, the current source type disturbance and the voltage drop disturbance are superposed, the disturbance quantity is dynamically changed and various combinations are achieved, and the electric energy quality control performance of a parallel electric energy quality control device and a series electric energy quality control device in various complex dynamic disturbance environments can be tested.

Description

Technical Field

[0001] The present application relates to the technical field of power distribution networks, and in particular to a testing system and a testing method for a power quality management device. Background Art

[0002] With the rapid development of new energy grid-connected technology, the number of power quality interference sources such as power generation units (such as distributed photovoltaic power generation) and DC loads (such as electric vehicle charging) in the distribution network has gradually increased. Their power volatility and nonlinearity are strong, making power quality problems such as harmonic distortion and voltage fluctuation in the distribution network increasingly serious. In addition, interference such as voltage distortion and voltage drop from the AC power grid will also affect the power quality of the distribution network. Usually, interference can be suppressed by power quality management devices to improve power quality. Power quality management devices mainly include parallel power quality management devices (such as capacitors, static VAR generators, passive filters, active filters, etc.) and series power quality management devices (such as solid-state switching switches, line voltage regulators, etc.).

[0003] In order to test the response speed, harmonic distortion and other performance of the power quality control device, the disturbance sources provided by the test system in the related technology include voltage source disturbance or current source disturbance, which cannot simulate the real scenario of the real power grid, resulting in low test reliability of the control effect of the power quality control device. Summary of the invention

[0004] In order to solve the problem of low reliability of testing the treatment effect of power quality treatment devices in the prior art, the present application provides a test system for power quality treatment devices, wherein the power quality treatment devices include parallel power quality treatment devices and series power quality treatment devices. The test system includes a power grid simulation unit, a power generation unit, a power consumption unit and a test unit.

[0005] The first ends of the power grid simulation unit and the series power quality management device are connected to the first AC bus, the second ends of the power grid simulation unit and the series power quality management device are connected to the second AC bus, and the power generation unit, the power consumption unit and the parallel power quality management device are connected to the second AC bus. The test unit is connected to the series power quality management device, and the test unit is connected to the series power quality management device.

[0006] The power grid simulation unit is used to provide voltage source disturbance for parallel power quality management devices and voltage drop disturbance for series power quality management devices.

[0007] Both the power generation unit and the power consumption unit are used to provide current source type disturbance for the parallel power quality management device.

[0008] The test unit is used to test the power quality management effect of the parallel type power quality management device under voltage source type disturbance and current source type disturbance, and also to test the power quality management effect of the series type power quality management device under voltage drop disturbance.

[0009] Optionally, the power grid simulation unit includes a programmable power supply and a line impedance. A first end of the programmable power supply is connected to the first AC bus, a second end of the programmable power supply is connected to the series power quality management device, a third end of the programmable power supply is connected to the first end of the line impedance, and a second end of the line impedance is connected to the second AC bus.

[0010] Programmable power supplies are used to: simulate AC power grid.

[0011] Line impedance is used to: Model power distribution lines.

[0012] It can be seen that the grid simulation unit can provide voltage source type disturbance for the parallel type power quality management device and voltage drop disturbance for the series type power quality management device through the programmable power supply and line impedance.

[0013] In some possible implementations, the power generation unit includes a DC power supply and an inverter.

[0014] The DC power supply is used to: output DC power to the inverter.

[0015] The inverter is used to convert direct current into alternating current and transmit it to the second AC bus.

[0016] It can be seen that the power generation unit can provide current source type disturbance for the parallel power quality management device through the DC power supply and the inverter.

[0017] In some other possible implementations, the power consumption unit includes an AC load and a DC power consumption unit. The DC power consumption unit includes a rectifier and a DC load. The AC load is connected to the second AC bus, the input end of the rectifier is connected to the second AC bus, and the output end of the rectifier is connected to the DC load.

[0018] The AC load is used to draw energy from the second AC bus.

[0019] The DC power consumption unit is used to convert the AC power from the second AC bus into DC power through a rectifier, and provide the DC power to the DC load.

[0020] It can be seen that the power consumption unit can provide current source type disturbance for the parallel power quality management device through the AC load and the DC power consumption unit.

[0021] Exemplarily, the test system further includes a first measuring unit, a second measuring unit and a third measuring unit.

[0022] The first measuring unit is arranged at the input end of the series-type power quality management device, and is used to collect the input voltage and input current of the series-type power quality management device.

[0023] The second measuring unit is arranged between the line impedance and the second AC bus, and is used for collecting the fundamental voltage, fundamental current, harmonic voltage and harmonic current of the second AC bus.

[0024] The third measuring unit is arranged at the input end of the parallel power quality management device, and is used to collect the input current of the parallel power quality management device.

[0025] The test unit is also used to: control the operating mode of the series power quality control device according to the input voltage and input current of the series power quality control device, and control the operating mode of the parallel power quality control device according to the fundamental voltage, fundamental current, harmonic voltage and harmonic current of the second AC bus and the input current of the parallel power quality control device.

[0026] Optionally, the operation modes of the series-type power quality management device include harmonic compensation mode, reactive power regulation mode and load switching mode.

[0027] The operation modes of the parallel type power quality control device include harmonic compensation mode and reactive power regulation mode.

[0028] Furthermore, the test unit is also used to adjust the length of the distribution line, the operation mode of the power generation unit and the operation mode of the power consumption unit, and provide voltage source type disturbance for the programmable power supply.

[0029] On the other hand, the present application also provides a testing method for a power quality control device, comprising:

[0030] Through the power grid simulation unit, a voltage source type disturbance is provided for the parallel type power quality management device in the power quality management device, and a voltage drop disturbance is provided for the series type power quality management device in the power quality management device.

[0031] The current source type disturbance is provided to the parallel type power quality control device through the power generation unit and the power consumption unit.

[0032] The test unit is used to test the power quality management effect of the parallel type power quality management device under voltage source type disturbance and current source type disturbance. The test unit is also used to test the power quality management effect of the series type power quality management device under voltage drop disturbance.

[0033] Optionally, the test method provided in this application also includes:

[0034] The first measuring unit collects the input voltage and input current of the series-type power quality control device.

[0035] The second measuring unit collects the fundamental voltage, fundamental current, harmonic voltage and harmonic current of the second AC bus.

[0036] The third measuring unit collects the input current of the parallel type power quality control device.

[0037] The test unit controls the operating mode of the series power quality control device according to the input voltage and input current of the series power quality control device, and controls the operating mode of the parallel power quality control device according to the fundamental voltage, fundamental current, harmonic voltage and harmonic current of the second AC bus and the input current of the parallel power quality control device.

[0038] Optionally, the operation modes of the series-type power quality management device include harmonic compensation mode, reactive power regulation mode and load switching mode.

[0039] The operation modes of the parallel type power quality control device include harmonic compensation mode and reactive power regulation mode.

[0040] Furthermore, the testing method provided by the present application also includes:

[0041] The length of the distribution line, the operation mode of the power generation unit and the operation mode of the power consumption unit are adjusted through the test unit to provide a voltage source type disturbance for the programmable power supply.

[0042] Optionally, the power grid simulation unit includes a programmable power supply and a line impedance. A first end of the programmable power supply is connected to the first AC bus, a second end of the programmable power supply is connected to the series power quality management device, a third end of the programmable power supply is connected to the first end of the line impedance, and a second end of the line impedance is connected to the second AC bus.

[0043] Programmable power supplies are used to: simulate AC power grid.

[0044] Line impedance is used to: Model power distribution lines.

[0045] It can be seen that the grid simulation unit can provide voltage source type disturbance for the parallel type power quality management device and voltage drop disturbance for the series type power quality management device through the programmable power supply and line impedance.

[0046] In some possible implementations, the power generation unit includes a DC power supply and an inverter.

[0047] The DC power supply is used to: output DC power to the inverter.

[0048] The inverter is used to convert direct current into alternating current and transmit it to the second AC bus.

[0049] It can be seen that the power generation unit can provide current source type disturbance for the parallel power quality management device through the DC power supply and the inverter.

[0050] In some other possible implementations, the power consumption unit includes an AC load and a DC power consumption unit. The DC power consumption unit includes a rectifier and a DC load. The AC load is connected to the second AC bus, the input end of the rectifier is connected to the second AC bus, and the output end of the rectifier is connected to the DC load.

[0051] The AC load is used to draw energy from the second AC bus.

[0052] The DC power consumption unit is used to convert the AC power from the second AC bus into DC power through a rectifier, and provide the DC power to the DC load.

[0053] It can be seen that the power consumption unit can provide current source type disturbance for the parallel power quality management device through the AC load and the DC power consumption unit.

[0054] In another aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed, the above-mentioned test method is implemented.

[0055] Compared with the prior art, the beneficial effects of this application are:

[0056] The test system provided in the present application includes a power grid simulation unit, a power generation unit, a power consumption unit and a test unit. The series power quality control device is connected between the first AC bus and the second AC bus, and the parallel power quality control device is connected to the second AC bus. The power grid simulation unit provides a voltage source type disturbance for the parallel power quality control device, provides a voltage drop disturbance for the series power quality control device, and provides a current source type disturbance for the parallel power quality control device through the power generation unit and the power consumption unit, so that the parallel power quality control device can control the power quality under the voltage source type disturbance and the current source type disturbance, so that the series power quality control device can control the power quality under the voltage drop disturbance, and then the test unit is used to test the control effect of the series power quality control device and the parallel power quality control device. It can be seen that the present application combines voltage source type disturbance and current source type disturbance, and also takes voltage drop disturbance into consideration, which can simulate the real scenario of the power grid. It not only does not affect the power quality management effect of the power quality management device on the power quality, but also can improve the test reliability of the test system.

[0057] The programmable power supply in this application is a voltage source type disturbance, and the power generation unit and the power consumption unit are current source type disturbances. Current source type disturbances include power supply type disturbances (including DC power supply) and power consumption type disturbances (including DC load and AC load). The power and disturbance amount of each disturbance can be dynamically adjusted by the test unit. After the superposition of multiple disturbances, the disturbance amount changes dynamically and the combination is diverse. The parallel power quality management device and the series power quality management device can be tested for their power quality management performance in a variety of complex dynamic disturbance environments.

[0058] The test system provided in the present application can test parallel power quality control devices and series power quality control devices, and can simultaneously test the comprehensive control effects when the parallel power quality control devices and the series power quality control devices coexist. It can not only test the control effect of the parallel power quality control device under voltage source type disturbance, but also can test the response characteristics of the series power quality control device under transient disturbances such as voltage drop disturbance. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0060] Figure 1 A schematic structural diagram of a test system in an embodiment of the present application;

[0061] Figure 2 Another schematic structural diagram of the test system in the embodiment of the present application;

[0062] Figure 3 A schematic flow chart of the test method in the embodiment of the present application. DETAILED DESCRIPTION

[0063] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0064] The terms "first", "second", etc. in the specification embodiments, claims, and drawings of the present application are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, including a series of steps or units. The method, system, product, or device is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0065] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0066] The present application provides a test system for a power quality control device, such as Figure 1 The power quality control device includes a parallel power quality control device P and a series power quality control device S. The test system 100 includes a power grid simulation unit 10, a power generation unit 20, a power consumption unit 30 and a test unit ( Figure 1 The testing unit may be a computer or the like.

[0067] The first ends of the power grid simulation unit 10 and the series power quality control device S are connected to the first AC bus AC1, and the first AC bus AC1 can be connected to the AC grid. The second ends of the power grid simulation unit 10 and the series power quality control device S are connected to the second AC bus AC2, and the power generation unit 20, the power consumption unit 30 and the parallel power quality control device P are connected to the second AC bus AC2. The test unit is connected to the series power quality control device S, and the test unit is connected to the series power quality control device P.

[0068] The power grid simulation unit 10 is used to provide a voltage source disturbance for the parallel power quality management device P and a voltage drop disturbance for the series power quality management device S.

[0069] The power generation unit 20 and the power consumption unit 30 are both used to provide a current source type disturbance for the parallel power quality control device P.

[0070] The test unit is used to test the power quality management effect of the parallel power quality management device P under voltage source type disturbance and current source type disturbance, and also to test the power quality management effect of the series power quality management device S under voltage drop disturbance.

[0071] Optionally, the power grid simulation unit 10 includes a programmable power supply 11 and a line impedance 12. A first end of the programmable power supply 11 is connected to the first AC bus AC1, a second end of the programmable power supply 11 is connected to the series power quality management device S, a third end of the programmable power supply 11 is connected to a first end of the line impedance 12, and a second end of the line impedance 12 is connected to the second AC bus AC2.

[0072] The programmable power supply 11 is used to simulate an AC power grid (which may be a low-voltage 380V three-phase AC power grid).

[0073] Line impedance 12 is used to simulate a power distribution line (which can be 380V overhead or cable).

[0074] It can be seen that the power grid simulation unit 10 can provide voltage source type disturbance for the parallel power quality control device P and provide voltage drop disturbance for the series power quality control device S through the programmable power supply 11 and the line impedance 12.

[0075] The programmable power supply 11 can be used as a power supply to provide power output to the series power quality control device S and the second AC bus AC2. The programmable power supply 11 can also be used as a load to send power back to the AC power grid. The programmable power supply 11 can simulate power quality problems on the grid side such as harmonic voltage distortion, sag, and voltage fluctuation. When the test system 100 tests the voltage drop response performance of the series power quality control device S, the voltage drop of the programmable power supply 11 at a certain moment can be set to be 10% of the nominal voltage or above. When the test system 100 tests the response performance of the parallel power quality control device P to harmonics, the voltage content rate of each harmonic of the programmable power supply 11 can be set.

[0076] Distribution lines of different conductor types and lengths can be simulated through line impedance 12. The inverter 22 and the like interact with the line impedance, which will cause harmonic amplification. In order to test the harmonic control performance of the parallel power quality control device, the line impedance can be adjusted to achieve the formation conditions of harmonic amplification.

[0077] In some possible implementations, the test system 100 may include a plurality of power generation units 20. Figure 2 Only one power generation unit is shown in the figure. Each power generation unit 20 includes a DC power source 21 and an inverter 22.

[0078] The DC power supply 21 is used to output DC power to the inverter 22. The DC power supply 21 can simulate a photovoltaic array, etc., and the output power is adjustable.

[0079] The inverter 22 is used to convert direct current into alternating current and transmit the alternating current to the second alternating current busbar AC2.

[0080] It can be seen that the power generation unit 20 can provide a current source type disturbance for the parallel power quality control device P through the DC power supply 21 and the inverter 22.

[0081] In some other possible implementations, the test system 100 may include multiple power consumption units 30 . Figure 2 Only one power unit is shown. Each power unit 30 includes an AC load 33 and a DC power unit 30. The DC power unit 30 includes a rectifier 31 (such as a charging pile, etc.) and a DC load 32 (such as an electric car, etc.). The AC load 33 is connected to the second AC bus AC2, the input end of the rectifier 31 is connected to the second AC bus AC2, and the output end of the rectifier 31 is connected to the DC load 32.

[0082] The AC load 33 is used to obtain energy from the second AC bus AC2. The AC load 33 may include an adjustable impedance module or an actual electrical device (such as a household appliance).

[0083] The DC power unit 30 is used to convert the AC power from the second AC bus AC2 into DC power through the rectifier 31, and provide it to the DC load 32. The size of the DC load 32 is controlled by the test unit, and its power is adjustable to simulate the power consumption behavior of the DC load 32 such as an electric car.

[0084] It can be seen that the power consumption unit 30 can provide a current source type disturbance for the parallel power quality control device P through the AC load 33 and the DC power consumption unit 30.

[0085] Exemplary, reference Figure 2 The test system 100 further includes a first measuring unit 40 , a second measuring unit 50 , and a third measuring unit 60 .

[0086] The first measuring unit 40 is arranged at the input end of the series-type power quality control device S, and is used to collect the input voltage and input current of the series-type power quality control device S.

[0087] The second measuring unit 50 is disposed between the line impedance 12 and the second AC bus AC2, and is used to collect the fundamental voltage, fundamental current, harmonic voltage and harmonic current of the second AC bus AC2.

[0088] The third measuring unit 60 is arranged at the input end of the parallel power quality control device P, and is used to collect the input current of the parallel power quality control device P.

[0089] The test unit is also used to: control the operating mode of the series power quality control device S according to the input voltage and input current of the series power quality control device S, and control the operating mode of the parallel power quality control device P according to the fundamental voltage, fundamental current, harmonic voltage and harmonic current of the second AC bus AC2 and the input current of the parallel power quality control device P.

[0090] Exemplarily, the first measuring unit 40 , the second measuring unit 50 , and the third measuring unit 60 may all be high-precision wave recorders, power quality measuring devices, and the like.

[0091] Optionally, the series power quality control device S includes a solid state transfer switch (SSTS), a line voltage regulator, etc. The operation modes of the series power quality control device S include a harmonic compensation mode, a reactive power regulation mode, and a load switching mode.

[0092] The series power quality management device S is mainly used to quickly switch off the load when a voltage drop occurs on a certain line. Its input port is connected to the first AC bus AC and the programmable power supply 11. When working, it is initially set to be powered by the first AC bus AC or the programmable power supply 11. When the voltage drops on the first AC bus AC (or the programmable power supply 11), the series power quality management device S will quickly switch to the programmable power supply 11 (or the first AC bus AC1) for power supply. The output end of the series power quality management device S is connected to the second AC bus AC2.

[0093] The parallel power quality control device P may include capacitors, static var generators (SVG), passive filters, active power filters (APF), etc. The parallel power quality control device P may have functions such as filtering compensation and voltage control.

[0094] The operation modes of the parallel power quality control device P include harmonic compensation mode and reactive power regulation mode.

[0095] Furthermore, the test unit is also used to adjust the length of the distribution line, the operation mode of the power generation unit 20 and the operation mode of the power consumption unit 30 , and provide voltage source type disturbance for the programmable power supply 11 .

[0096] Optional, reference Figure 2In the test system 100, a switch BP1 can be set between the series power quality management device S and the first AC bus AC1. A switch BP2 can be set between the programmable power supply 11 and the first AC bus AC1. A switch BP3 can be set between the programmable power supply 11 and the series power quality management device S. A switch BP4 can be set between the programmable power supply 11 and the line impedance 12. A switch BP5 can be set between the power generation source 20 and the second AC bus AC2. A switch BP6 can be set between the AC load 33 and the second AC bus AC2. A switch BP7 can be set between the power consumption unit 30 and the second AC bus AC2. A switch BP8 can be set between the parallel power quality management device P and the second AC bus AC2.

[0097] Therefore, the test unit is also used to control all the above switches.

[0098] The embodiment of the present application provides a test method for a power quality control device, wherein the power quality control device includes a parallel power quality control device P and a series power quality control device S.

[0099] The parallel power quality control device P may include capacitors, static var generators (SVG), passive filters, active filters (APF), etc. The parallel power quality control device P may have functions such as filtering compensation and voltage control. The operation modes of the parallel power quality control device P include harmonic compensation mode and reactive power regulation mode.

[0100] Optionally, the series power quality control device S includes a solid state transfer switch (SSTS), a line voltage regulator, etc. The operation modes of the series power quality control device S include a harmonic compensation mode, a reactive power regulation mode, and a load switching mode.

[0101] The series power quality management device S is mainly used to quickly switch off the load when a voltage drop occurs on a certain line. Its input port is connected to the first AC bus AC and the programmable power supply 11. When working, it is initially set to be powered by the first AC bus AC or the programmable power supply 11. When the voltage drops on the first AC bus AC (or the programmable power supply 11), the series power quality management device S will quickly switch to the programmable power supply 11 (or the first AC bus AC1) for power supply. The output end of the series power quality management device S is connected to the second AC bus AC2.

[0102] like Figure 3 As shown, the test method 200 provided in the embodiment of the present application includes the following steps:

[0103] Step S1: Provide a voltage source disturbance to the parallel power quality management device P and provide a voltage drop disturbance to the series power quality management device S through the power grid simulation unit 10.

[0104] Step S2: providing a current source disturbance to the parallel power quality control device P through the power generation unit 20 and the power consumption unit 30.

[0105] Step S3: The power quality control effect of the parallel power quality control device P under voltage source type disturbance and current source type disturbance is tested by the test unit, and the power quality control effect of the series power quality control device S under voltage drop disturbance is also tested by the test unit.

[0106] Optionally, the power grid simulation unit 10 includes a programmable power supply 11 and a line impedance 12. A first end of the programmable power supply 11 is connected to the first AC bus AC1, a second end of the programmable power supply 11 is connected to the series power quality management device S, a third end of the programmable power supply 11 is connected to a first end of the line impedance 12, and a second end of the line impedance 12 is connected to the second AC bus AC2.

[0107] The programmable power supply 11 is used to simulate an AC power grid (which may be a low-voltage 380V three-phase AC power grid).

[0108] Line impedance 12 is used to simulate a power distribution line (which can be 380V overhead or cable).

[0109] It can be seen that the power grid simulation unit 10 can provide voltage source type disturbance for the parallel power quality control device P and provide voltage drop disturbance for the series power quality control device S through the programmable power supply 11 and the line impedance 12.

[0110] The programmable power supply 11 can be used as a power supply to provide power output to the series power quality control device S and the second AC bus AC2. The programmable power supply 11 can also be used as a load to send power back to the AC power grid. The programmable power supply 11 can simulate power quality problems on the grid side such as harmonic voltage distortion, sag, and voltage fluctuation. When the test system 100 tests the voltage drop response performance of the series power quality control device S, the voltage drop of the programmable power supply 11 at a certain moment can be set to be 10% of the nominal voltage or above. When the test system 100 tests the response performance of the parallel power quality control device P to harmonics, the voltage content rate of each harmonic of the programmable power supply 11 can be set.

[0111] Distribution lines of different conductor types and lengths can be simulated through line impedance 12. The inverter 22 and the like interact with the line impedance, which will cause harmonic amplification. In order to test the harmonic control performance of the parallel power quality control device, the line impedance can be adjusted to achieve the formation conditions of harmonic amplification.

[0112] In some possible implementations, the power generation unit 20 includes a DC power source 21 and an inverter 22 .

[0113] The DC power supply 21 is used to output DC power to the inverter 22. The DC power supply 21 can simulate a photovoltaic array, etc., and the output power is adjustable.

[0114] The inverter 22 is used to convert direct current into alternating current and transmit the alternating current to the second alternating current busbar AC2.

[0115] It can be seen that the power generation unit 20 can provide a current source type disturbance for the parallel power quality control device P through the DC power supply 21 and the inverter 22.

[0116] In some other possible implementations, the power unit 30 includes an AC load 33 and a DC power unit 30. The DC power unit 30 includes a rectifier 31 (such as a charging pile, etc.) and a DC load 32 (such as an electric car, etc.). The AC load 33 is connected to the second AC bus AC2, the input end of the rectifier 31 is connected to the second AC bus AC2, and the output end of the rectifier 31 is connected to the DC load 32.

[0117] The AC load 33 is used to obtain energy from the second AC bus AC2. The AC load 33 may include an adjustable impedance module or an actual electrical device (such as a household appliance).

[0118] The DC power unit 30 is used to convert the AC power from the second AC bus AC2 into DC power through the rectifier 31, and provide it to the DC load 32. The size of the DC load 32 is controlled by the test unit in the test system 100, and its power is adjustable to simulate the power consumption behavior of the DC load 32 such as an electric car.

[0119] It can be seen that the power consumption unit 30 can provide a current source type disturbance for the parallel power quality control device P through the AC load 33 and the DC power consumption unit 30.

[0120] Optionally, the test method 200 provided in the embodiment of the present application further includes:

[0121] The first measuring unit 40 collects the input voltage and input current of the series-connected power quality control device S.

[0122] The second measuring unit 50 collects the fundamental voltage, fundamental current, harmonic voltage and harmonic current of the second AC bus AC2.

[0123] The third measuring unit 60 collects the input current of the parallel power quality control device P.

[0124] The test unit controls the operating mode of the series power quality control device S according to the input voltage and input current of the series power quality control device S, and controls the operating mode of the parallel power quality control device P according to the fundamental voltage, fundamental current, harmonic voltage and harmonic current of the second AC bus AC2 and the input current of the parallel power quality control device P.

[0125] Exemplarily, the first measuring unit 40 , the second measuring unit 50 , and the third measuring unit 60 may all be high-precision wave recorders, power quality measuring devices, and the like.

[0126] Furthermore, the test method 200 provided in the embodiment of the present application also includes:

[0127] The length of the power distribution line, the operating mode of the power generation unit 20 and the operating mode of the power consumption unit 30 are adjusted by the test unit to provide a voltage source type disturbance for the programmable power supply 11 .

[0128] Furthermore, the test unit is also used to adjust the length of the distribution line, the operation mode of the power generation unit 20 and the operation mode of the power consumption unit 30 , and provide voltage source type disturbance for the programmable power supply 11 .

[0129] Optional, reference Figure 2 , a switch BP1 can be set between the series power quality management device S and the first AC bus AC1. A switch BP2 can be set between the programmable power supply 11 and the first AC bus AC1. A switch BP3 can be set between the programmable power supply 11 and the series power quality management device S. A switch BP4 can be set between the programmable power supply 11 and the line impedance 12. A switch BP5 can be set between the power generation source 20 and the second AC bus AC2. A switch BP6 can be set between the AC load 33 and the second AC bus AC2. A switch BP7 can be set between the power consumption unit 30 and the second AC bus AC2. A switch BP8 can be set between the parallel power quality management device P and the second AC bus AC2.

[0130] Therefore, the test unit is also used to control all the above switches.

[0131] The test method provided in the embodiment of the present application can test the load switching performance of a series control device (such as a solid-state switch), the harmonic control performance of a parallel power quality control device, and the voltage control performance of a parallel power quality control device. The following are introduced respectively:

[0132] (1) Test the load switching performance of the solid-state transfer switch. The specific process is as follows:

[0133] 1) Control switch BP1, switch BP2, switch BP4 and switch BP6 to be closed, and control other switches to be open.

[0134] 2) In the initial state, the programmable power supply 11 supplies power to the AC load 33 through the second AC bus AC2.

[0135] 3) Use the test unit to control the programmable power supply 11 to operate in a voltage drop state, and the drop amplitude is greater than 10% of the nominal voltage. Test the voltage signals of each output line of the solid-state switching switch, analyze the voltage drop and rise time of each output line, and calculate the response accuracy and response time of the solid-state switching switch switching load. The amplitude of the voltage drop can be set to different voltage values, such as 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% of the nominal voltage.

[0136] (2) Test the harmonic control performance of the parallel power quality control device P. The specific process is as follows:

[0137] 1) Control switch BP1 to be turned off, and control switch BP2, switch BP4, switch BP5, switch BP6 and switch BP7 to be turned on.

[0138] 2) The second AC bus AC2 measures the 2nd to 50th harmonic voltage, and the parallel power quality control device P measures the 2nd to 50th harmonic current. The test unit changes the harmonic voltage distortion value of the programmable power supply 11, changes the line impedance, the operation mode of the power generation unit 20, the operation mode of the power consumption unit 30, etc., uses the first measurement unit 40 to collect the input voltage and input current of the series power quality control device S, uses the second measurement unit 50 to collect the fundamental voltage, fundamental current, harmonic voltage and harmonic current of the second AC bus AC2, and uses the third measurement unit 60 to collect the input current of the parallel power quality control device P. Combined with simulation calculations, the harmonic amplification conditions of the second AC bus AC2 are formed.

[0139] 3) Control switch BP8 to close, adjust the operation mode of the parallel power quality control device P to the harmonic compensation operation mode, collect the above information using the first measuring unit 40, the second measuring unit 50 and the third measuring unit 60, and calculate and analyze the changes in the harmonic voltages of the second AC bus AC2 before and after the parallel power quality control device P is connected.

[0140] (3) Test the voltage management performance of the parallel power quality management device P. The specific process is as follows:

[0141] 1) Control switch BP1 and switch BP3 to be turned off, and control switch BP2, switch BP4, switch BP5, switch BP6, and switch BP7 to be turned on.

[0142] 2) Adjust the DC load 32 to simulate voltage fluctuations, use the first measuring unit 40 to collect the input voltage and input current of the series power quality control device S, use the second measuring unit 50 to collect the fundamental voltage, fundamental current, harmonic voltage and harmonic current of the second AC bus AC2, and use the third measuring unit 60 to collect the input current of the parallel power quality control device P.

[0143] 3) Adjust the output voltage of the programmable power supply 11, simulate voltage drop or fluctuation, use the second measuring unit 50 to collect the fundamental voltage, fundamental current, harmonic voltage and harmonic current of the second AC bus AC2, and calculate and analyze the response time and control effect of the parallel power quality control device P to voltage drop or fluctuation.

[0144] 4) Control switch BP8 to close, and adjust the operation mode of the parallel power quality control device P to the voltage control mode, use the second measuring unit 50 to collect the fundamental voltage, fundamental current, harmonic voltage and harmonic current of the second AC bus AC2, and calculate and analyze the changes in the fundamental voltage, fundamental current, harmonic voltage and harmonic current of the second AC bus AC before and after the parallel power quality control device P is connected.

[0145] Based on the same inventive concept, the embodiment of the present application also provides a computer-readable storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both a built-in storage medium in a computer device and an extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the test method provided in the above embodiment.

[0146] Those skilled in the art will appreciate that the embodiments of the application may be provided as methods, systems, or computer program products. Therefore, the application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0147] The application is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0148] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0149] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0150] The above are merely embodiments of the application and are not intended to limit the application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the application are included in the scope of the claims of the pending application.

Claims

1. A test system for a power quality control device, characterized in that: The test system includes a power grid simulation unit, a power generation unit, a power consumption unit and a test unit; The first ends of the power grid simulation unit and the series power quality management device in the power quality management device are respectively connected to the first AC bus, the second ends of the power grid simulation unit and the series power quality management device are respectively connected to the second AC bus, the power generation unit, the power consumption unit and the parallel power quality management device in the power quality management device are connected to the second AC bus, the test unit is connected to the series power quality management device, and the test unit is connected to the series power quality management device; The power grid simulation unit is used to: provide voltage source type disturbance for the parallel type power quality management device, and provide voltage drop disturbance for the series type power quality management device; The power generation unit and the power consumption unit are both used to: provide current source type disturbance for the parallel power quality management device; The testing unit is used to test the power quality management effect of the parallel type power quality management device under the voltage source type disturbance and the current source type disturbance, and also to test the power quality management effect of the series type power quality management device under the voltage drop disturbance.

2. The test system according to claim 1, characterized in that: The power grid simulation unit includes a programmable power supply and a line impedance; the first end of the programmable power supply is connected to the first AC bus, the second end of the programmable power supply is connected to the series power quality management device, the third end of the programmable power supply is connected to the first end of the line impedance, and the second end of the line impedance is connected to the second AC bus; The programmable power supply is used to: simulate an AC power grid; The line impedance is used to: simulate a power distribution line.

3. The test system according to claim 1, characterized in that: The power generation unit includes a DC power supply and an inverter; The DC power supply is used to: output DC power to the inverter; The inverter is used to convert the direct current into alternating current and transmit the alternating current to the second alternating current bus.

4. The test system according to claim 1, characterized in that: The power consumption unit includes an AC load and a DC power consumption unit; wherein the DC power consumption unit includes a rectifier and a DC load; the AC load is connected to the second AC bus, the input end of the rectifier is connected to the second AC bus, and the output end of the rectifier is connected to the DC load; The AC load is used to: draw energy from the second AC bus; The DC power consumption unit is used to convert the AC power from the second AC bus into DC power through the rectifier, and provide the DC power to the DC load.

5. The test system according to claim 2, characterized in that: The test system further includes a first measuring unit, a second measuring unit and a third measuring unit; The first measuring unit is arranged at the input end of the series-type power quality control device, and is used to collect the input voltage and input current of the series-type power quality control device; The second measuring unit is arranged between the line impedance and the second AC bus, and is used to collect the fundamental voltage, fundamental current, harmonic voltage and harmonic current of the second AC bus; The third measuring unit is arranged at the input end of the parallel power quality management device, and is used to collect the input current of the parallel power quality management device; The test unit is also used to control the operating mode of the series power quality control device according to the input voltage and input current of the series power quality control device, and to control the operating mode of the parallel power quality control device according to the fundamental voltage, fundamental current, harmonic voltage and harmonic current of the second AC bus and the input current of the parallel power quality control device.

6. The test system according to claim 5, characterized in that: The test unit is also used to adjust the length of the power distribution line, the operation mode of the power generation unit and the operation mode of the power consumption unit, and provide the voltage source type disturbance for the programmable power supply.

7. The test system according to claim 5, characterized in that: The operation modes of the series power quality control device include harmonic compensation mode, reactive power regulation mode and load switching mode; The operation modes of the parallel type power quality control device include a harmonic compensation mode and a reactive power regulation mode.

8. A testing method for a power quality control device, characterized in that: include: Providing a voltage source type disturbance to a parallel type power quality management device in the power quality management device through a power grid simulation unit, and providing a voltage drop disturbance to a series type power quality management device in the power quality management device; Providing a current source type disturbance to the parallel type power quality control device through a power generation unit and a power consumption unit; The power quality control effect of the parallel type power quality control device under the voltage source type disturbance and the current source type disturbance is tested by a test unit, and the power quality control effect of the series type power quality control device under the voltage drop disturbance is also tested by a test unit.

9. The testing method according to claim 8, characterized in that: The test method also includes: The first measuring unit collects the input voltage and input current of the series power quality control device; The second measuring unit collects the fundamental voltage, fundamental current, harmonic voltage and harmonic current of the second AC bus; The third measuring unit collects the input current of the parallel power quality control device; The test unit controls the operation mode of the series power quality control device according to the input voltage and input current of the series power quality control device, and controls the operation mode of the parallel power quality control device according to the fundamental voltage, fundamental current, harmonic voltage and harmonic current of the second AC bus and the input current of the parallel power quality control device.

10. The testing method according to claim 9, characterized in that: The test method also includes: The length of the power distribution line, the operation mode of the power generation unit and the operation mode of the power consumption unit are adjusted by the test unit to provide the voltage source type disturbance for the programmable power supply.

11. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the testing method according to any one of claims 8 to 10 is implemented.

Images