Test system of bidirectional converter device

Abstract

The utility model provides a testing system for a bidirectional converter device, and relates to the technical field of rail transit power supply, and the system comprises a boosting device which is connected with a power supply device; the first bidirectional converter device and the second bidirectional converter device are connected in parallel, the alternating current side of the first bidirectional converter device and the alternating current side of the second bidirectional converter device are both connected with the boosting device, and the direct current side of the first bidirectional converter device is connected with the direct current side of the second bidirectional converter device. According to the embodiment of the invention, when the bidirectional converter device is tested, the first bidirectional converter device and the second bidirectional converter device are connected in parallel, and the circulating current is formed between the first bidirectional converter device and the second bidirectional converter device, so that the bidirectional converter device can be used for power distribution between the first bidirectional converter device and the second bidirectional converter device; and the requirement on the capacity of the power supply is reduced, so that the testing of the bidirectional converter device is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rail transit power supply, and in particular to a test system of a bidirectional converter. BACKGROUND

[0002] The traction power supply system of urban rail transit bears multiple functions such as power conversion, transmission, feedback, fault protection and isolation, and is the core system of urban rail transit. The bidirectional converter, as a key power supply device of the system, is usually composed of a step-down transformer and a converter cabinet. Before leaving the factory, the bidirectional converter needs to undergo strict testing to ensure its performance and reliability.

[0003] However, due to the high input voltage (the rated output voltage is 35kV) and high peak power (the peak power can reach 6MW-12MW) of the bidirectional converter, the factory generally cannot provide a large-capacity load that meets the peak power, and improper handling can easily lead to the tripping of the entire factory power supply, affecting normal office and production activities. Therefore, the current test is usually only conducted on the converter cabinet in the bidirectional converter, and the test of the step-down transformer is ignored, which leads to poor accuracy of the test results. SUMMARY

[0004] The embodiments of the present application provide a test system of a bidirectional converter to solve the problem of poor accuracy of the test results of the bidirectional converter.

[0005] To solve the above technical problems, the embodiments of the present application provide a test system of a bidirectional converter, which comprises:

[0006] a boosting device connected with a power supply device;

[0007] a first bidirectional converter and a second bidirectional converter, wherein the first bidirectional converter and the second bidirectional converter are connected in parallel, the AC side of the first bidirectional converter and the AC side of the second bidirectional converter are both connected with the boosting device, and the DC side of the first bidirectional converter is connected with the DC side of the second bidirectional converter.

[0008] Optionally, the system further comprises a high-voltage protection device connected with the boosting device and connected with the AC side of the first bidirectional converter and the AC side of the second bidirectional converter.

[0009] Optionally, the high-voltage protection device comprises a first protection sub-device, a second protection sub-device and a third protection sub-device.

[0010] The first end of the first protection sub-device is connected with the boosting device.

[0011] The second end of the first protection sub-device is connected with the first end of the second protection sub-device, and the second end of the second protection sub-device is connected with the AC side of the first bidirectional current conversion device.

[0012] The second end of the first protection sub-device is also connected with the first end of the third protection sub-device, and the second end of the third protection sub-device is connected with the AC side of the second bidirectional current conversion device.

[0013] Optionally, the first bidirectional current conversion device comprises a first step-down transformer and a first current conversion cabinet.

[0014] The second end of the second protection sub-device is connected with the primary side of the first step-down transformer, and the secondary side of the first step-down transformer is connected with the first current conversion cabinet.

[0015] Optionally, the second bidirectional current conversion device comprises a second step-down transformer and a second current conversion cabinet.

[0016] The second end of the third protection sub-device is connected with the primary side of the second step-down transformer, and the secondary side of the second step-down transformer is connected with the second current conversion cabinet.

[0017] Optionally, the protection sub-device is a high-voltage air-filled switch cabinet or a high-voltage circuit breaker.

[0018] When the protection sub-device is a high-voltage air-filled switch cabinet, the first protection sub-device is a high-voltage air-filled incoming line cabinet, the second protection sub-device is a first high-voltage air-filled outgoing line cabinet, and the third protection sub-device is a second high-voltage air-filled outgoing line cabinet.

[0019] Optionally, the system further comprises a buffer device, and the step-up device is connected with the power supply device through the buffer device.

[0020] Optionally, the buffer device comprises any one of a column type voltage regulator, an inductive type voltage regulator, an excitation adjustment device, and a buffer resistor.

[0021] Optionally, the system further comprises a low-voltage protection device.

[0022] The low-voltage protection device is connected with the power supply device and the buffer device.

[0023] Optionally, the low-voltage protection device comprises any one of a low-voltage circuit breaker, a low-voltage switch cabinet, and a low-voltage anti-reverse flow device.

[0024] In the embodiment of the present application, when the bidirectional converter is tested, the first bidirectional converter and the second bidirectional converter are connected in parallel, and the first bidirectional converter and the second bidirectional converter operate in a rectification state and an inversion state respectively, a circulating current is formed between the first bidirectional converter and the second bidirectional converter, and the circulating current can be used for power distribution between the first bidirectional converter and the second bidirectional converter, so that the capacity requirement of the power supply is reduced, and the bidirectional converter is tested. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 is one of the structure diagrams of a bidirectional converter test system provided by the embodiments of the present application;

[0027] Figure 2 is the second structure diagram of a bidirectional converter test system provided by the embodiments of the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0029] Early urban rail transit traction power supply systems mainly use diode rectifier units to provide traction power when the train starts and accelerates, but the braking energy generated when the train brakes can only be consumed by on-board or ground braking resistors, and the energy waste is large. The bidirectional converter can have both the traction power supply capability of the rectifier unit and the feedback capability of the braking energy, thereby forming a new generation of urban rail transit traction power supply bidirectional converter system, which can significantly improve the energy saving index, optimize the power supply environment, and is the development direction of the urban rail transit traction power supply system.

[0030] Because bidirectional converters have high input voltages (typically 35kV rated output voltage) and large capacities (peak power reaching 6MW–12MW), they place high demands on their testing systems. A bidirectional converter generally consists of a step-down transformer and a converter cabinet. The step-down transformer has an input voltage of 35kV, which is insufficient for typical factory power supplies. Therefore, testing is usually limited to the converter cabinet, which fails to verify the step-down transformer itself, resulting in inaccurate test results.

[0031] This application provides a testing system for a bidirectional converter to address the problem of poor accuracy in testing results for bidirectional converters.

[0032] See Figure 1 and Figure 2 , Figure 1 and Figure 2 This is a structural diagram of a test system for a bidirectional converter provided in an embodiment of this application, as shown below. Figure 1 and Figure 2 As shown, the testing system includes:

[0033] The booster device 1 is connected to the power supply device 2;

[0034] The first bidirectional converter 3 and the second bidirectional converter 4 are connected in parallel. The AC side of the first bidirectional converter 3 and the AC side of the second bidirectional converter 4 are both connected to the boost converter 1. The DC side of the first bidirectional converter 3 is connected to the DC side of the second bidirectional converter 4.

[0035] The power supply unit 2 can be a low-voltage power grid. For example, it can be a three-phase AC power supply of 380V to 400V or a three-phase AC power supply of 660V to 690V. The 380V to 400V three-phase power supply can be used for office and production operations, while the 660V to 690V three-phase power supply can be used for production operations. The power supply unit 2 can also serve as the power input for the testing system.

[0036] The step-up unit 1 is used to transform and step up the low-voltage power grid in the plant area to the input voltage required by the two sets of bidirectional converters. The step-up unit 1 includes, but is not limited to, various types of dry-type step-up transformers, oil-immersed step-up transformers, etc.

[0037] like Figure 2As shown, the first bidirectional current conversion device 3 and the second bidirectional current conversion device 4 each include an alternating current side and a direct current side, wherein the alternating current side is the side of the bidirectional current conversion device connected with the alternating current power grid (corresponding to the upper side of the bidirectional current conversion device in the figure), and the direct current side is the other side opposite to the alternating current side (corresponding to the lower side of the bidirectional current conversion device in the figure). On the direct current side of the first bidirectional current conversion device 3 and the second bidirectional current conversion device 4, the positive electrode of the first bidirectional current conversion device 3 is connected with the positive electrode of the second bidirectional current conversion device 4, and the negative electrode of the first bidirectional current conversion device 3 is connected with the negative electrode of the second bidirectional current conversion device 4; on the alternating current side of the first bidirectional current conversion device 3 and the second bidirectional current conversion device 4, the first bidirectional current conversion device 3 and the second bidirectional current conversion device 4 are connected with the voltage boosting device 1.

[0038] After the test system is powered on, the first bidirectional current conversion device 3 operates first and works in a rectification state, energy flows from the alternating current side to the direct current side and stabilizes, and then the second bidirectional current conversion device 4 starts to operate and works in an inversion state, energy flows from the direct current side of the second bidirectional current conversion device 4 to the alternating current side, thereby forming a circulating current between the first bidirectional current conversion device 3 and the second bidirectional current conversion device 4. When the circulating current increases, the two sets of bidirectional current conversion devices (the first bidirectional current conversion device 3 and the second bidirectional current conversion device 4) gradually operate to full load power.

[0039] Since the circulating current energy flows between the two sets of bidirectional current conversion devices, the operating power of the two sets of bidirectional current conversion devices can be maintained through the circulating current energy, thereby reducing the capacity requirement of the power supply device. Through the above device, the entire device of the bidirectional current conversion device can be tested, the comprehensiveness of the test is improved, and the accuracy of the test is improved.

[0040] Optionally, in some embodiments, as shown in Figure 1 and Figure 2 The system further includes a high-voltage protection device 5, which is connected with the voltage boosting device 1 and connected with the alternating current side of the first bidirectional current conversion device 3 and the alternating current side of the second bidirectional current conversion device 4.

[0041] In the case that the test system includes the high-voltage protection device 5, the high-voltage protection device 5 can be connected with the first bidirectional current conversion device 3 and the second bidirectional current conversion device 4 at the same time, for protecting the first bidirectional current conversion device 3 and the second bidirectional current conversion device 4. When the first bidirectional current conversion device 3 or the second bidirectional current conversion device 4 fails during the test, the high-voltage protection device 5 will act in time, i.e., cut off the bidirectional current conversion device that fails, thereby protecting the devices of the test system.

[0042] Optionally, in some embodiments, as shown in Figure 1 and 2 The high-voltage protection device 5 includes a first protection sub-device 51, a second protection sub-device 52, and a third protection sub-device 53.

[0043] The first end of the first protection sub-device 51 is connected to the booster device 1;

[0044] The second end of the first protection sub-device 51 is connected to the first end of the second protection sub-device 52, and the second end of the second protection sub-device 52 is connected to the AC side of the first bidirectional converter 3.

[0045] The second end of the first protection sub-device 51 is also connected to the first end of the third protection sub-device 53, and the second end of the third protection sub-device 53 is connected to the AC side of the second bidirectional converter 4.

[0046] The high-voltage protection device 5 may include three sub-protection devices, namely the first protection sub-device 51, the second protection sub-device 52 and the third protection sub-device 53.

[0047] The first protection sub-device 51 is connected to the booster device 1, the second protection sub-device 52 is connected to the first bidirectional converter 3, and the third protection sub-device 53 is connected to the second bidirectional converter 4.

[0048] The second protection sub-device 52 is used to protect the first bidirectional converter 3, and the third protection sub-device 53 is used to protect the second bidirectional converter 4. When the first bidirectional converter 3 fails, the second protection sub-device 52 will activate, disconnecting the first bidirectional converter 3 from the test system; when the second bidirectional converter 4 fails, the third protection sub-device 53 will activate, disconnecting the second bidirectional converter 4 from the test system. If, during the above process, the second protection sub-device 52 or the third protection sub-device 53 fails to activate reliably, the first protection sub-device 51 will activate, disconnecting both the first bidirectional converter 3 and the second bidirectional converter 4 from the test system.

[0049] High-voltage protection devices can not only be used to disconnect bidirectional converters that have failed in the downstream stage, but also protect various devices in the upstream stage.

[0050] The two sets of bidirectional converters are protected by the second protection sub-device 52 and the third protection sub-device 53 respectively, and further protected by the first protection sub-device 51, which can improve the reliability of the protection device.

[0051] Alternatively, in some implementations, such as Figure 1 and Figure 2 As shown, the first bidirectional converter 3 includes a first step-down transformer 31 and a first converter cabinet 32;

[0052] The second end of the second protection sub-device 52 is connected with the primary side of the first step-down transformer 31, and the secondary side of the first step-down transformer 31 is connected with the alternating current side of the first current conversion cabinet 32.

[0053] The first step-down transformer 31 and the first current conversion cabinet 32 are protected by the second protection sub-device 52, so that the test of the first step-down transformer 31 and the first current conversion cabinet 32 can be realized, the comprehensiveness of the test is improved, and the accuracy of the test result is improved.

[0054] Optionally, in some embodiments, as shown in Figure 1 and Figure 2 The second bidirectional current conversion device 4 includes a second step-down transformer 41 and a second current conversion cabinet 42.

[0055] The second end of the third protection sub-device 53 is connected with the primary side of the second step-down transformer 41, and the secondary side of the second step-down transformer 41 is connected with the alternating current side of the second current conversion cabinet 42.

[0056] The direct current side of the second current conversion cabinet is connected with the direct current side of the first current conversion cabinet, the positive electrode of the first current conversion cabinet is connected with the positive electrode of the second current conversion cabinet, and the negative electrode of the first current conversion cabinet is connected with the negative electrode of the second current conversion cabinet.

[0057] The second step-down transformer 41 and the second current conversion cabinet 42 are protected by the third protection sub-device 53, so that the test of the second step-down transformer 41 and the second current conversion cabinet 42 can be realized, the comprehensiveness of the test is improved, and the accuracy of the test result is improved.

[0058] Optionally, in some embodiments, the protection sub-device is a high-voltage air-filled switch cabinet or a high-voltage circuit breaker.

[0059] When the protection sub-device is a high-voltage air-filled switch cabinet, the first protection sub-device 51 is a high-voltage air-filled incoming line cabinet, the second protection sub-device 52 is a first high-voltage air-filled outgoing line cabinet, and the third protection sub-device 53 is a second high-voltage air-filled outgoing line cabinet.

[0060] The high-voltage protection device, for example, a high-voltage 35kV air-filled switch cabinet, can include a high-voltage 35kV air-filled incoming line cabinet, a first high-voltage 35kV air-filled outgoing line cabinet, and a second high-voltage 35kV air-filled outgoing line cabinet.

[0061] When the protection sub-device is a high-voltage circuit breaker, the above-mentioned three protection sub-devices can all be high-voltage circuit breakers.

[0062] In addition, the three protection sub-devices can also be a combination of a high-voltage gas-filled switch cabinet and a high-voltage circuit breaker, that is, part of the protection sub-devices are high-voltage gas-filled switch cabinets, and part of the protection sub-devices are high-voltage circuit breakers, which are not limited in the embodiment.

[0063] Optionally, in some embodiments, as shown in Figure 1 and Figure 2 The system further comprises a buffer device 7, and the boosting device 1 is connected with the power supply device 2 through the buffer device 7.

[0064] In the test power-up process, the step-down transformer in the two sets of bidirectional current conversion devices generates a huge excitation current, and if there is no current limiting by the buffer device 7, the low-voltage protection device 6 will malfunction in the power-up process, so that all kinds of devices in the subsequent test system cannot be normally powered up. By limiting the excitation current of the two sets of bidirectional current conversion devices during power-up through the buffer device 7, the low-voltage protection device 6 will not act until all the devices in the subsequent stage are powered up.

[0065] The buffer device 7 includes but is not limited to any one of a column type voltage regulator, an inductive voltage regulator, an excitation adjusting device, and a buffer resistor.

[0066] Optionally, in some embodiments, as shown in Figure 1 and Figure 2 The system further comprises a low-voltage protection device 6.

[0067] The low-voltage protection device 6 is connected with the power supply device 2 and connected with the buffer device 7.

[0068] The low-voltage protection device 6 can be used for protecting the power supply device 2, and the high-voltage protection device 5 can be used for protecting the first bidirectional current conversion device 3 and the second bidirectional current conversion device 4.

[0069] In the case of failure of the first bidirectional current conversion device 3 or the second bidirectional current conversion device 4, the high-voltage protection device will act to cut off the failed current conversion device.

[0070] If the high-voltage protection device 5 fails to act reliably, the low-voltage protection device 6 will act to cut off all kinds of devices in the subsequent test system, so as to protect the plant area power grid from being affected.

[0071] The high-voltage protection device is used for protecting devices in a higher voltage state, and the low-voltage protection device can be used for protecting devices in a lower voltage state. The high voltage and the low voltage can be determined according to the division standard of the high and low voltage range in the power field.

[0072] The test system can be protected by the low-voltage protection device 6 and the high-voltage protection device 5 to avoid expansion of faults and to protect the power supply device.

[0073] Optionally, the low-voltage protection device includes any one of a low-voltage circuit breaker, a low-voltage switch cabinet, and a low-voltage anti-backflow device.

[0074] To facilitate understanding of the above embodiments, the structure and specific working principle of the test system of the present application are described below through specific embodiments.

[0075] As shown in Figure 1 and 2 , the test system includes:

[0076] a step-up device 1, a power supply device 2, a low-voltage protection device 6, a buffer device 7, a high-voltage protection device 5, a first bidirectional current conversion device 3, and a second bidirectional current conversion device 4. The power supply device 2, the low-voltage protection device 6, the buffer device 7, the step-up device 1, and the high-voltage protection device 5 are connected in sequence, and the first bidirectional current conversion device 3 and the second bidirectional current conversion device 4 are connected to the high-voltage protection device 5 in parallel.

[0077] The power supply device 2 is a factory low-voltage power grid, such as an alternating current (AC) 400V power grid.

[0078] The low-voltage protection device 6 is a low-voltage 400V switch cabinet connected to the power supply device 2.

[0079] The buffer device 7 is a column-type voltage regulator with a voltage regulation range of 0-400V and is connected to the low-voltage protection device 6.

[0080] The step-up device 1 is a dry-type step-up transformer with a transformation ratio of AC 400V / AC 35kV and is connected to the buffer device 7.

[0081] The high-voltage protection device 5 is a high-voltage 35kV gas-filled switch cabinet composed of a high-voltage 35kV gas-filled incoming line cabinet, a first high-voltage 35kV gas-filled outgoing line cabinet, and a second high-voltage 35kV gas-filled outgoing line cabinet.

[0082] The input end of the high-voltage 35kV gas-filled incoming line cabinet is directly connected to the secondary side of the dry-type step-up transformer, and the output end of the high-voltage 35kV gas-filled incoming line cabinet is connected to the input end of the first high-voltage 35kV gas-filled outgoing line cabinet and the input end of the second high-voltage 35kV gas-filled outgoing line cabinet.

[0083] The first bidirectional converter 3 is composed of a first 35kV step-down transformer and a first converter cabinet 32. The transformation ratio of the first 35kV step-down transformer is AC 35kV / AC 950V. The primary side of the first 35kV step-down transformer is connected with the output end of the first high-voltage 35kV gas-filled outgoing line cabinet, and the secondary side of the first 35kV step-down transformer is connected with the AC side of the first converter cabinet 32.

[0084] The second bidirectional converter 4 is composed of a second 35kV step-down transformer and a second converter cabinet 42. The transformation ratio of the second 35kV step-down transformer is AC 35kV / AC 950V. The primary side of the second 35kV step-down transformer is connected with the output end of the second high-voltage 35kV gas-filled outgoing line cabinet, and the secondary side of the second 35kV step-down transformer is connected with the AC side of the second converter cabinet 42.

[0085] The DC sides of the first bidirectional converter 3 and the second bidirectional converter 4 are directly connected.

[0086] Based on the above structure, before the test system is powered on, the low-voltage protection device, the high-voltage 35kV gas-filled incoming line cabinet, the first high-voltage 35kV gas-filled outgoing line cabinet, and the second high-voltage 35kV gas-filled outgoing line cabinet are all in an open state, and the output adjustment of the column voltage regulator is 0V.

[0087] Subsequently, the first high-voltage 35kV gas-filled outgoing line cabinet, the second high-voltage 35kV gas-filled outgoing line cabinet, the high-voltage 35kV gas-filled incoming line cabinet, and the low-voltage 400V switch cabinet are sequentially closed in order, and then the output of the column voltage regulator is adjusted from 0V to AC 400V.

[0088] Due to the electromagnetic induction principle of the transformer, the output of the secondary side of each transformer will gradually increase according to the designed transformation ratio as the input voltage increases, until the secondary side voltage of the dry-type step-up transformer is stabilized at high-voltage 35kV, and the secondary side voltage of the first 35kV step-down transformer and the secondary side voltage of the second 35kV step-down transformer are stabilized at AC 950V. At this point, the power-on process is completed.

[0089] Since the output of the column voltage regulator is gradually adjusted from 0V, the power-on excitation current of the transformer can be limited to a very small value, which will not cause the low-voltage 400V switch cabinet to malfunction.

[0090] After the test system is powered on, the first bidirectional converter 3 is first operated and works in a rectification state, at this time, the energy flows from the 35kV AC side to the DC side of the first bidirectional converter 3, and the DC side voltage is stabilized at direct current (DC) 1500V, then the second bidirectional converter 4 starts to operate and works in an inversion state, at this time, the energy flows from the DC side to the 35kV AC side of the second bidirectional converter 4, thereby forming a circulating current. The direction of the circulating current is the direction of the energy flow, as shown in the following figure. Figure 2as shown in the middle.

[0091] The circulating current is gradually increased by gradually increasing the output current value of the two sets of bidirectional converter devices, so that the two sets of bidirectional converter devices gradually operate at full load power. The first bidirectional converter device 3 operates at full load in the rectification state, and the second bidirectional converter device 4 operates at full load in the inversion state.

[0092] Since the circulating current energy flows completely between the two sets of bidirectional converter devices, the capacity requirement for the power supply device is reduced, and general industrial power can meet the requirement.

[0093] Similarly, the second bidirectional converter device 4 can be controlled to operate first and work in the rectification state, and the first bidirectional converter device 3 can be controlled to operate subsequently and work in the inversion state, so as to cover the rectification full load working condition and the inversion full load working condition of each bidirectional converter device.

[0094] During the test, if the first bidirectional converter device 3 has a short circuit, overcurrent or other serious fault, the first high-voltage 35kV inflatable outgoing line cabinet will act to disconnect the first bidirectional converter device 3 from the test system. If the second bidirectional converter device 4 has a short circuit, overcurrent or other serious fault, the second high-voltage 35kV inflatable outgoing line cabinet will act to disconnect the second bidirectional converter device 4 from the test system.

[0095] If the first high-voltage 35kV inflatable outgoing line cabinet and the second high-voltage 35kV inflatable outgoing line cabinet fail to act reliably, the high-voltage 35kV inflatable incoming line cabinet will act to disconnect both sets of bidirectional converter devices from the test system.

[0096] If the first high-voltage 35kV inflatable outgoing line cabinet, the second high-voltage 35kV inflatable outgoing line cabinet and the high-voltage 35kV inflatable incoming line cabinet all fail to act reliably, the low-voltage 400V switch cabinet will act to disconnect all devices in the rear stage from the AC 400V power grid in the factory, so as to ensure that the AC 400V power grid in the factory is not affected.

[0097] Since the bidirectional converter device has both traction power supply and energy feedback functions, it can work in both rectification and inversion conditions, and the peak power is generally 6MW-12MW. However, the factory generally cannot provide a large-capacity load of 6MW-12MW, and improper handling can easily cause the entire factory power supply to trip, affecting normal office and production activities. The existing test system generally only tests low-power loads and cannot test both rectification and inversion conditions, so it cannot verify the limit working capacity of the bidirectional converter device.

[0098] The test system of the embodiment of the present application can perform peak power full load test on the bidirectional converter, and can simultaneously test rectification and inversion conditions, and comprehensively verify the function and performance of the bidirectional converter. The test system is also adapted and protected for the plant power grid, directly provides 35kV high voltage input voltage for the bidirectional converter, and does not affect the original power grid of the plant, and guarantees the normal work and production operation of the plant. In general, the test system has the following beneficial effects:

[0099] 1. The rectification condition and the inversion condition of the bidirectional converter can be tested, and all conditions of the bidirectional converter are comprehensively verified;

[0100] 2. The step-down transformer and the converter cabinet in the bidirectional converter can be tested, and all components of the bidirectional converter are comprehensively verified;

[0101] 3. The peak power full load test can be performed on the bidirectional converter, and the limit performance of the bidirectional converter is comprehensively verified;

[0102] 4. Since the energy flows in the test system during the test, the low voltage power grid capacity of the plant is not high, and all components of the bidirectional converter can be tested;

[0103] 5. The test device has perfect protection device, and the low voltage power grid of the plant can be protected during the high power full load test, and the normal office and production activities are not affected.

[0104] It should be noted that in this document, the term "comprising" or "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that the object or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such object or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of another identical element in the object or device including the element.

[0105] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above specific embodiments, and the above specific embodiments are only illustrative, but not limiting, and those skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the protection scope of the claims.

Claims

1. A test system for a bidirectional converter device, characterized by, The system comprises: a voltage boosting device connected with the power supply device; a first bidirectional current conversion device and a second bidirectional current conversion device, wherein the first bidirectional current conversion device and the second bidirectional current conversion device are connected in parallel, the AC side of the first bidirectional current conversion device and the AC side of the second bidirectional current conversion device are both connected with the voltage boosting device, and the DC side of the first bidirectional current conversion device is connected with the DC side of the second bidirectional current conversion device.

2. The system of claim 1, wherein, The system further comprises a high-voltage protection device connected with the voltage boosting device and connected with the AC side of the first bidirectional current conversion device and the AC side of the second bidirectional current conversion device.

3. The system of claim 2, wherein, The high-voltage protection device comprises a first protection sub-device, a second protection sub-device, and a third protection sub-device. The first end of the first protection sub-device is connected with the voltage boosting device. The second end of the first protection sub-device is connected with the first end of the second protection sub-device, and the second end of the second protection sub-device is connected with the AC side of the first bidirectional current conversion device. The second end of the first protection sub-device is also connected with the first end of the third protection sub-device, and the second end of the third protection sub-device is connected with the AC side of the second bidirectional current conversion device.

4. The system of claim 3, wherein, The first bidirectional current conversion device comprises a first step-down transformer and a first current conversion cabinet. The second end of the second protection sub-device is connected with the primary side of the first step-down transformer, and the secondary side of the first step-down transformer is connected with the first current conversion cabinet.

5. The system of claim 4, wherein, The second bidirectional current conversion device comprises a second step-down transformer and a second current conversion cabinet. The second end of the third protection sub-device is connected with the primary side of the second step-down transformer, and the secondary side of the second step-down transformer is connected with the second current conversion cabinet.

6. The system of claim 3, wherein, The protection sub-device is a high-voltage gas-filled switch cabinet or a high-voltage circuit breaker. When the protection sub-device is a high-voltage gas-filled switch cabinet, the first protection sub-device is a high-voltage gas-filled incoming line cabinet, the second protection sub-device is a first high-voltage gas-filled outgoing line cabinet, and the third protection sub-device is a second high-voltage gas-filled outgoing line cabinet.

7. The system of any one of claims 1 to 6, wherein, The system further comprises a buffer device through which the voltage boosting device is connected with the power supply device.

8. The system of claim 7, wherein, The buffer device comprises any one of a column-type voltage regulator, an inductive voltage regulator, an excitation adjustment device, and a buffer resistor.

9. The system of claim 7, wherein, The system further comprises a low-voltage protection device. The low-voltage protection device is connected with the power supply device and connected with the buffer device.

10. The system of claim 9, wherein, The low-voltage protection device comprises any one of a low-voltage circuit breaker, a low-voltage switch cabinet, and a low-voltage anti-backflow device.

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