High-voltage direct-mounted energy storage converter power unit test system and method

Abstract

The present disclosure relates to a high-voltage direct-mounted energy storage and conversion power unit test system and method. The system includes: an AC power supply module, a first high-voltage direct-mounted energy storage and conversion power test unit, a second high-voltage direct-mounted energy storage and conversion power test unit and a control module. The first high-voltage direct-mounted energy storage and conversion power test unit is used for charging and discharging tests of the first power unit; the second high-voltage direct-mounted energy storage and conversion power test unit is used for charging and discharging tests of the second power unit; the control module is used for voltage and current sampling of the AC power supply module and power control of the first power unit and the second power unit. The embodiment of the present disclosure can efficiently, accurately and quickly realize the test of the high-voltage direct-mounted energy storage and conversion power unit, including the charging and discharging of the battery pack and the power control of the energy storage and conversion power unit. It has the advantages of simple structure and simple and flexible methods. The two energy storage and conversion power units are tested together, which greatly improves the test efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric energy storage, and in particular relates to a high-voltage direct-mounted energy storage converter power unit testing system and method. Background Art

[0002] With the rapid development of renewable energy power generation represented by wind power generation and photovoltaic power generation, the volatility, randomness and uncertainty of new energy power generation have posed huge challenges to the safe and stable operation of the power grid. In order to solve this problem, energy storage technology has been applied to the transmission and distribution link, and through the rapid adjustment of the voltage and power of the power grid, the power generation of new energy can be smoothed to achieve optimized management of power quality. The high-voltage direct-mounted large-capacity energy storage system connects the energy storage battery cluster in parallel to the DC capacitor of the chain converter, realizing the decentralized placement and management of a large number of batteries, and has achieved relatively mature engineering demonstration applications in China.

[0003] High-voltage direct-mounted large-capacity energy storage systems are generally composed of three-phase cascaded energy storage converter power units, which include a large number of energy storage cascade modules. How to efficiently, accurately and quickly implement the testing of high-voltage direct-mounted energy storage converter power units is currently a difficulty in improving the reliability of energy storage systems.

[0004] Therefore, there is an urgent need for a high-voltage direct-mounted energy storage converter power unit testing system and testing method. Summary of the invention

[0005] In order to achieve the above-mentioned object, according to a first aspect of an embodiment of the present disclosure, a high-voltage direct-mounted energy storage conversion power unit test system is provided, the system comprising: an AC power supply module, a first high-voltage direct-mounted energy storage conversion power test unit, a second high-voltage direct-mounted energy storage conversion power test unit and a control module;

[0006] The first high-voltage direct-mounted energy storage conversion power test unit is connected to the AC power supply module and is used for charging and discharging testing of the first power unit;

[0007] The second high-voltage direct-mounted energy storage conversion power test unit is connected to the AC power supply module and is used for charging and discharging testing of the second power unit;

[0008] The first high-voltage direct-mounted energy storage conversion power test unit and the second high-voltage direct-mounted energy storage conversion power test unit are in a parallel connection relationship;

[0009] The control module is respectively connected to the first high-voltage direct-mounted energy storage conversion power test unit, the second high-voltage direct-mounted energy storage conversion power test unit and the control module, and is used for voltage and current sampling of the AC power supply module and power control of the first power unit and the second power unit.

[0010] Optionally, the AC power supply module includes a three-phase AC power supply, a circuit breaker, a transformer and a reactor connected in series.

[0011] Optionally, the first high-voltage direct-mounted energy storage conversion power test unit includes: a first power unit and a first control unit connected to each other;

[0012] The first power unit is used to provide or absorb variable current power;

[0013] The first control unit is used to control the first power unit;

[0014] The first power unit includes a first H-bridge, a first pre-charging circuit and a first battery pack connected in parallel.

[0015] Optionally, the first H-bridge includes a first bridge arm and a second bridge arm connected in parallel;

[0016] The first bridge arm includes a first insulated gate bipolar transistor and a second insulated gate bipolar transistor connected in series with each other;

[0017] The second bridge arm comprises a third insulated gate bipolar transistor and a fourth insulated gate bipolar transistor connected in series with each other;

[0018] A connection point between the emitter of the first insulated gate bipolar transistor and the collector of the second insulated gate bipolar transistor is connected to a first phase of the reactor;

[0019] A connection point between the emitter of the third insulated gate bipolar transistor and the collector of the fourth insulated gate bipolar transistor is connected to the second phase of the reactor.

[0020] Optionally, the first pre-charging circuit includes: a first charging resistor, a first switch, a second switch, a third switch, a fourth switch and a first capacitor;

[0021] The first capacitor and the second switch are connected in series between the collector of the first insulated gate bipolar transistor and the positive electrode of the first battery pack in sequence;

[0022] The fourth switch is connected in series between the emitter of the second insulated gate bipolar transistor and the negative electrode of the first battery pack;

[0023] The first switch and the first capacitor are connected in series in sequence between a connection point between the first charging resistor and the second switch and an emitter of the second insulated gate bipolar transistor;

[0024] The third switch and the first capacitor are connected in series in sequence between the collector of the first insulated gate bipolar transistor and the emitter of the second insulated gate bipolar transistor.

[0025] Optionally, the first high-voltage direct-mounted energy storage conversion power test unit includes: a first DCDC and a second DCDC;

[0026] The first DCDC and the second DCDC are used to supply power to the first control unit;

[0027] The first DCDC is powered by the first battery pack;

[0028] The second DCDC is powered by the first H-bridge.

[0029] Optionally, the second high-voltage direct-mounted energy storage conversion power test unit includes: a second power unit and a second control unit connected to each other;

[0030] The second power unit is used to provide or absorb variable current power;

[0031] The second control unit is used to control the second power unit;

[0032] The second power unit includes a second H-bridge, a second pre-charging circuit, and a second battery pack connected in parallel.

[0033] Optionally, the second H-bridge includes a third bridge arm and a fourth bridge arm connected in parallel;

[0034] The third bridge arm comprises a fifth insulated gate bipolar transistor and a sixth insulated gate bipolar transistor connected in series with each other;

[0035] The fourth bridge arm comprises a seventh insulated gate bipolar transistor and an eighth insulated gate bipolar transistor connected in series with each other;

[0036] A connection point between the emitter of the fifth insulated gate bipolar transistor and the collector of the sixth insulated gate bipolar transistor is connected to the third phase of the reactor;

[0037] A connection point between the emitter of the seventh insulated gate bipolar transistor and the collector of the eighth insulated gate bipolar transistor is connected to the second phase of the reactor.

[0038] Optionally, the second pre-charging circuit includes: a second charging resistor, a fifth switch, a sixth switch, a seventh switch, an eighth switch and a second capacitor;

[0039] The second capacitor and the sixth switch are connected in series between the collector of the fifth insulated gate bipolar transistor and the positive electrode of the second battery pack in sequence;

[0040] The eighth switch is connected in series between the emitter of the sixth insulated gate bipolar transistor and the negative electrode of the second battery pack;

[0041] The fifth switch and the second capacitor are connected in series in sequence between a connection point between the second charging resistor and the sixth switch and an emitter of the sixth insulated gate bipolar transistor;

[0042] The seventh switch and the second capacitor are connected in series between the collector of the fifth insulated gate bipolar transistor and the emitter of the sixth insulated gate bipolar transistor in sequence.

[0043] Optionally, the second high-voltage direct-mounted energy storage conversion power test unit includes: a third DCDC and a fourth DCDC;

[0044] The third DCDC and the fourth DCDC are used to supply power to the second control unit;

[0045] The third DCDC is powered by the second battery pack;

[0046] The fourth DCDC is powered by the second H-bridge.

[0047] According to a second aspect of an embodiment of the present disclosure, a method for testing a high-voltage direct-mounted energy storage conversion power unit is provided. The method is based on the high-voltage direct-mounted energy storage conversion power unit testing system described in any one of the first aspects. The method includes:

[0048] The control module controls the circuit breaker to disconnect;

[0049] The second control unit controls the fifth switch, the sixth switch, the seventh switch and the eighth switch to be disconnected;

[0050] The first control unit controls the first switch and the second switch to be disconnected, and controls the third switch and the fourth switch to be closed, so that the first power unit is in a battery side pre-charging waiting state;

[0051] After receiving the pre-charging instruction sent by the control module, the first control unit controls the second switch to close, so that the first battery pack charges the first capacitor through the first charging resistor;

[0052] When the charging time threshold is reached, the first control unit controls the first switch to close, controls the third switch to open, and the control module controls the circuit breaker to close;

[0053] When the absolute value of the difference between the collector voltage of the first insulated gate bipolar transistor and the positive electrode voltage of the first battery pack is less than the allowable voltage difference, the first control unit controls the third switch to be closed;

[0054] The control module calculates the active power in real time by sampling the three-phase voltage and current signals between the reactor and the transformer, and performs closed-loop power control on the first power unit in combination with the given active power, thereby realizing the charge and discharge function test of the first battery pack;

[0055] After the test is completed, a discharge operation is performed on the first capacitor, the control module controls the circuit breaker to disconnect, the first control unit controls the second switch, the third switch and the fourth switch to disconnect, the first control unit controls the first H-bridge inverter to output three-phase AC power, and after the first capacitor is discharged, the first control unit controls the first switch to disconnect and controls the insulated gate bipolar transistor gating signal of the first H-bridge to reset.

[0056] Optionally, the method further comprises:

[0057] The control module controls the circuit breaker to disconnect;

[0058] The first control unit controls the first switch, the second switch, the third switch and the fourth switch to be disconnected;

[0059] The second control unit controls the fifth switch and the sixth switch to be disconnected, and controls the seventh switch and the eighth switch to be closed, so that the second power unit is in a battery side pre-charging waiting state;

[0060] After receiving the pre-charging instruction sent by the control module, the second control unit controls the sixth switch to be closed, so that the second battery pack charges the second capacitor through the second charging resistor;

[0061] When the charging time threshold is reached, the second control unit controls the fifth switch to close, controls the seventh switch to open, and the control module controls the circuit breaker to close;

[0062] When the absolute value of the difference between the collector voltage of the fifth insulated gate bipolar transistor and the positive electrode voltage of the second battery pack is less than the allowable voltage difference, the second control unit controls the seventh switch to be closed;

[0063] The control module calculates the active power in real time by sampling the three-phase voltage and current signals between the reactor and the transformer, and performs closed-loop power control on the second power unit in combination with the given active power, thereby realizing the charge and discharge function test of the second battery pack;

[0064] After the test is completed, a discharge operation is performed on the second capacitor, the control module controls the circuit breaker to disconnect, the second control unit controls the sixth switch, the seventh switch and the eighth switch to disconnect, the second control unit controls the second H-bridge inverter to output three-phase AC power, and after the second capacitor is discharged, the second control unit controls the fifth switch to disconnect and controls the insulated gate bipolar transistor gating signal of the second H-bridge to reset.

[0065] In summary, the embodiment of the present disclosure provides a high-voltage direct-mounted energy storage conversion power unit test system, the system comprising: an AC power supply module, a first high-voltage direct-mounted energy storage conversion power test unit, a second high-voltage direct-mounted energy storage conversion power test unit and a control module; the first high-voltage direct-mounted energy storage conversion power test unit is connected to the AC power supply module, and is used for charging and discharging tests of the first power unit; the second high-voltage direct-mounted energy storage conversion power test unit is connected to the AC power supply module, and is used for charging and discharging tests of the second power unit; the first high-voltage direct-mounted energy storage conversion power test unit and the second high-voltage direct-mounted energy storage conversion power test unit are in a parallel connection relationship; the control module is respectively connected to the first high-voltage direct-mounted energy storage conversion power test unit, the second high-voltage direct-mounted energy storage conversion power test unit and the control module, and is used for voltage and current sampling of the AC power supply module and power control of the first power unit and the second power unit. The disclosed embodiment can efficiently, accurately and quickly implement the test of high-voltage direct-mounted energy storage and conversion power units, including the charging and discharging of battery packs and the power control of energy storage and conversion power units. It has the advantages of simple structure and simple and flexible methods. The two energy storage and conversion power units can be tested together, which greatly improves the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly illustrate the implementation scheme of the present disclosure, the drawings required for use in the implementation scheme will be briefly introduced below. It should be understood that the drawings only show certain implementation schemes of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on the drawings without paying creative work.

[0067] Figure 1 It is a schematic diagram of a high-voltage direct-mounted energy storage and current conversion power unit testing system according to an exemplary embodiment.

[0068] Figure 2 The present invention is a flow chart showing a method for testing a high-voltage direct-mounted energy storage converter power unit according to an exemplary embodiment.

[0069] Figure 3 The present invention is a flow chart showing a method for testing a high-voltage direct-mounted energy storage converter power unit according to an exemplary embodiment. DETAILED DESCRIPTION

[0070] In order to clearly illustrate the technical features of the present solution, the present disclosure is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0071] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0072] It should be understood that the various steps described in the method embodiments of the present disclosure may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present disclosure is not limited in this respect.

[0073] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0074] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0075] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more". In the description of the present disclosure, unless otherwise specified, "multiple" means two or more than two, and other quantifiers are similar; "at least one item", "one or more items" or similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one item a can represent any number of a; for another example, one or more items of a, b and c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple; "and / or" is a kind of association relationship that describes the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural.

[0076] Although operations or steps are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood that it is required to perform these operations or steps in the specific order shown or in a serial order, or to perform all the operations or steps shown to obtain the desired results. In the embodiments of the present disclosure, these operations or steps can be performed in series; these operations or steps can also be performed in parallel; or some of these operations or steps can be performed.

[0077] At the same time, it is understood that the data involved in this technical solution (including but not limited to the data itself, the acquisition or use of the data) should comply with the requirements of the corresponding laws and regulations and relevant provisions. The present disclosure is explained below in conjunction with specific embodiments.

[0078] Figure 1 FIG. 1 is a schematic diagram of a high-voltage direct-mounted energy storage power unit test system according to an exemplary embodiment. Figure 1 As shown, the embodiment of the present disclosure provides a high-voltage direct-mounted energy storage conversion power unit test system, which includes: an AC power supply module 10, a first high-voltage direct-mounted energy storage conversion power test unit 20, a second high-voltage direct-mounted energy storage conversion power test unit 30 and a control module 40. The first high-voltage direct-mounted energy storage conversion power test unit 20 is connected to the AC power supply module 10 and is used for the charge and discharge test of the first power unit PU1. The second high-voltage direct-mounted energy storage conversion power test unit 30 is connected to the AC power supply module 10 and is used for the charge and discharge test of the second power unit PU2.

[0079] The first high-voltage direct-mounted energy storage conversion power test unit 20 and the second high-voltage direct-mounted energy storage conversion power test unit 30 are in parallel connection. Figure 1 As shown, the collector of the first H-bridge 50 is connected to the collector of the second H-bridge 70 , and the emitter of the first H-bridge 50 is connected to the emitter of the second H-bridge 70 .

[0080] The control module 40 is respectively connected to the first high-voltage direct-mounted energy storage conversion power test unit 20, the second high-voltage direct-mounted energy storage conversion power test unit 30 and the control module 40, and is used for voltage and current sampling of the AC power supply module 10 and power control of the first power unit PU1 and the second power unit PU2. Exemplarily, the first high-voltage direct-mounted energy storage conversion power test unit 20 and the second high-voltage direct-mounted energy storage conversion power test unit 30 can communicate with the control module 40 through an optical fiber interface to transmit system status information, fault information, mode information and instructions.

[0081] In summary, the embodiment of the present disclosure provides a high-voltage direct-mounted energy storage conversion power unit test system, the system comprising: an AC power supply module, a first high-voltage direct-mounted energy storage conversion power test unit, a second high-voltage direct-mounted energy storage conversion power test unit and a control module; the first high-voltage direct-mounted energy storage conversion power test unit is connected to the AC power supply module, and is used for charging and discharging tests of the first power unit; the second high-voltage direct-mounted energy storage conversion power test unit is connected to the AC power supply module, and is used for charging and discharging tests of the second power unit; the first high-voltage direct-mounted energy storage conversion power test unit and the second high-voltage direct-mounted energy storage conversion power test unit are in a parallel connection relationship; the control module is respectively connected to the first high-voltage direct-mounted energy storage conversion power test unit, the second high-voltage direct-mounted energy storage conversion power test unit and the control module, and is used for voltage and current sampling of the AC power supply module and power control of the first power unit and the second power unit. The disclosed embodiment can efficiently, accurately and quickly implement the test of high-voltage direct-mounted energy storage and conversion power units, including the charging and discharging of battery packs and the power control of energy storage and conversion power units. It has the advantages of simple structure and simple and flexible methods. The two energy storage and conversion power units can be tested together, which greatly improves the test efficiency.

[0082] In some embodiments, the AC power supply module 10 includes a three-phase AC power supply, a circuit breaker QF, a transformer T, and a reactor L connected in series, wherein the reactor L is a three-phase reactor. Figure 1 As shown, the three-phase AC power supply can be a 380V three-phase AC power supply for providing electric energy or absorbing electric energy. The transformer T is used for power supply voltage conversion, and the circuit breaker QF is used for shutting off or connecting the three-phase AC power supply. For example, if a power unit failure occurs during the test, the control module 40 can control the circuit breaker QF to disconnect to ensure system safety.

[0083] In some embodiments, the first high-voltage direct-mounted energy storage conversion power test unit 20 includes: a first power unit PU1 and a first control unit CU1 connected to each other. The first power unit PU1 is used to provide or absorb conversion power. The first control unit CU1 is used to control the first power unit PU1. The first power unit PU1 includes a first H-bridge 50, a first pre-charging circuit 60 and a first battery pack B1 connected in parallel.

[0084] In some embodiments, the first H-bridge 50 includes a first bridge arm and a second bridge arm connected in parallel.

[0085] The first bridge arm includes a first insulated gate bipolar transistor Q11 and a second insulated gate bipolar transistor Q12 connected in series. The second bridge arm includes a third insulated gate bipolar transistor Q13 and a fourth insulated gate bipolar transistor Q14 connected in series. A connection point U1 between the emitter of the first insulated gate bipolar transistor Q11 and the collector of the second insulated gate bipolar transistor Q12 is connected to the first phase of the reactor L. A connection point V1 between the emitter of the third insulated gate bipolar transistor Q13 and the collector of the fourth insulated gate bipolar transistor Q14 is connected to the second phase of the reactor L.

[0086] In some embodiments, the first pre-charging circuit 60 includes: a first charging resistor R1, a first switch K11, a second switch K12, a third switch K13, a fourth switch K14 and a first capacitor C1. Exemplarily, the switches may be single-pole single-throw switches.

[0087] The first capacitor C1 and the second switch K12 are connected in series in sequence between the collector UDC12+ of the first insulated gate bipolar transistor Q11 and the positive electrode UDC11+ of the first battery pack B1.

[0088] The fourth switch K14 is connected in series between the emitter UDC12- of the second insulated gate bipolar transistor Q12 and the negative electrode UDC11- of the first battery pack B1. The first switch K11 and the first capacitor C1 are connected in series between the connection point between the first charging resistor R1 and the second switch K12 and the emitter UDC12- of the second insulated gate bipolar transistor Q12. The third switch K13 and the first capacitor C1 are connected in series between the collector UDC12+ of the first insulated gate bipolar transistor Q11 and the emitter UDC12- of the second insulated gate bipolar transistor Q12. The circuit can realize the pre-charging of the first capacitor C1 and the charge and discharge control of the first capacitor C1 and the first battery pack B1 in cooperation with the first control unit CU1.

[0089] In some embodiments, the first high-voltage direct-mounted energy storage conversion power test unit 20 includes: a first DCDC PW11 and a second DCDC PW12. The first DCDC PW11 and the second DCDC PW12 are used to power the first control unit CU1. The first DCDC PW11 is powered by the first battery pack B1. The second DCDC PW12 is powered by the first H bridge 50. In this way, the first control unit CU1 can be powered by dual power supplies, which improves the stability and reliability of its power supply.

[0090] In some embodiments, the second high-voltage direct-mounted energy storage conversion power test unit 30 includes: a second power unit PU2 and a second control unit CU2 connected to each other. The second power unit PU2 is used to provide or absorb conversion power. The second control unit CU2 is used to control the second power unit PU2. The second power unit PU2 includes a second H-bridge 70, a second pre-charging circuit 80, and a second battery pack B2 connected in parallel.

[0091] In some embodiments, the second H-bridge 70 includes a third bridge arm and a fourth bridge arm connected in parallel;

[0092] The third bridge arm includes a fifth insulated gate bipolar transistor Q21 and a sixth insulated gate bipolar transistor Q22 connected in series. The fourth bridge arm includes a seventh insulated gate bipolar transistor Q23 and an eighth insulated gate bipolar transistor connected in series.

[0093] A connection point U2 between the emitter of the fifth IGBT Q21 and the collector of the sixth IGBT Q22 is connected to the third phase of the reactor L. A connection point V2 between the emitter of the seventh IGBT Q23 and the collector of the eighth IGBT Q24 is connected to the second phase of the reactor L.

[0094] In some embodiments, the second pre-charging circuit 80 includes: a second charging resistor R2, a fifth switch K21, a sixth switch K22, a seventh switch K23, an eighth switch K24 and a second capacitor C2. Exemplarily, the switches may be single-pole single-throw switches.

[0095] The second capacitor C2 and the sixth switch K22 are connected in series between the collector UDC22+ of the fifth insulated gate bipolar transistor Q21 and the positive electrode UDC21+ of the second battery pack B2. The eighth switch K24 is connected in series between the emitter UDC22- of the sixth insulated gate bipolar transistor Q22 and the negative electrode UDC21- of the second battery pack B2.

[0096] The fifth switch K21 and the second capacitor C2 are connected in series between the connection point of the second charging resistor R2 and the sixth switch K22 and the emitter UDC22- of the sixth insulated gate bipolar transistor Q22. The seventh switch K23 and the second capacitor C2 are connected in series between the collector UDC22+ of the fifth insulated gate bipolar transistor Q21 and the emitter UDC22- of the sixth insulated gate bipolar transistor Q22. The circuit can realize the pre-charging of the second capacitor C2 and the charge and discharge control of the second capacitor C2 and the second battery pack B2 in cooperation with the second control unit CU2.

[0097] In some embodiments, the second high-voltage direct-mounted energy storage conversion power test unit 30 includes: a third DCDC PW21 and a fourth DCDC PW22. The third DCDC PW21 and the fourth DCDC PW22 are used to power the second control unit CU2. The third DCDC PW21 is powered by the second battery pack B2. The fourth DCDC PW22 is powered by the second H bridge 70. In this way, the second control unit CU2 can be powered by dual power supplies, which improves the stability and reliability of its power supply.

[0098] In summary, the embodiment of the present disclosure provides a high-voltage direct-mounted energy storage conversion power unit test system, the system comprising: an AC power supply module, a first high-voltage direct-mounted energy storage conversion power test unit, a second high-voltage direct-mounted energy storage conversion power test unit and a control module; the first high-voltage direct-mounted energy storage conversion power test unit is connected to the AC power supply module, and is used for charging and discharging tests of the first power unit; the second high-voltage direct-mounted energy storage conversion power test unit is connected to the AC power supply module, and is used for charging and discharging tests of the second power unit; the first high-voltage direct-mounted energy storage conversion power test unit and the second high-voltage direct-mounted energy storage conversion power test unit are in a parallel connection relationship; the control module is respectively connected to the first high-voltage direct-mounted energy storage conversion power test unit, the second high-voltage direct-mounted energy storage conversion power test unit and the control module, and is used for voltage and current sampling of the AC power supply module and power control of the first power unit and the second power unit. The disclosed embodiment can efficiently, accurately and quickly implement the test of high-voltage direct-mounted energy storage and conversion power units, including the charging and discharging of battery packs and the power control of energy storage and conversion power units. It has the advantages of simple structure and simple and flexible methods. The two energy storage and conversion power units can be tested together, which greatly improves the test efficiency.

[0099] Figure 2 FIG. 1 is a flow chart showing a method for testing a high voltage direct-mounted energy storage power conversion unit according to an exemplary embodiment. Figure 2 As shown, an embodiment of the present disclosure provides a high-voltage direct-mounted energy storage conversion power unit testing method, which is based on the high-voltage direct-mounted energy storage conversion power unit testing system described in any of the above embodiments, and the method may include the following steps:

[0100] S1: The control module 40 controls the circuit breaker QF to be disconnected;

[0101] S2: the second control unit CU2 controls the fifth switch K21, the sixth switch K22, the seventh switch K23 and the eighth switch K24 to be turned off;

[0102] S3: the first control unit CU1 controls the first switch K11 and the second switch K12 to be disconnected, and controls the third switch K13 and the fourth switch K14 to be closed, and the first power unit PU1 is in a battery side pre-charging waiting state;

[0103] S4: After receiving the pre-charging instruction from the control module 40, the first control unit CU1 controls the second switch K12 to close, so that the first battery pack B1 charges the first capacitor C1 through the first charging resistor R1;

[0104] S5: When the high-voltage charging time threshold T1 is reached, the first control unit CU1 controls the first switch K11 to close, controls the third switch K13 to open, and the control module 40 controls the circuit breaker QF to close;

[0105] S6: When the absolute value of the difference between the collector voltage of the first insulated gate bipolar transistor Q11 and the positive electrode voltage of the first battery pack B1 is less than the allowable voltage difference UDCM, the first control unit CU1 controls the third switch K13 to close;

[0106] S7: The control module 40 calculates the active power Pact in real time by sampling the three-phase voltage and current signals between the reactor L and the transformer T, and performs closed-loop power control on the first power unit PU1 in combination with the given active power Pgiven, thereby realizing the charge and discharge function test of the first battery pack B1;

[0107] S8: After the test is completed, the first capacitor C1 is discharged, the control module 40 controls the circuit breaker QF to be disconnected, the first control unit CU1 controls the second switch K12, the third switch K13 and the fourth switch K14 to be disconnected, the first control unit CU1 controls the first H-bridge 50 to invert and output three-phase AC power, and after the first capacitor C1 is discharged, the first control unit CU1 controls the first switch K11 to be disconnected, and controls the insulated gate bipolar transistor gating signal of the first H-bridge 50 to be reset.

[0108] Figure 3 FIG. 1 is a flow chart showing a method for testing a high voltage direct-mounted energy storage power conversion unit according to an exemplary embodiment. Figure 3 As shown, the method may further include the following steps:

[0109] S9: The control module 40 controls the circuit breaker QF to be disconnected;

[0110] S10: The first control unit CU1 controls the first switch K11, the second switch K12, the third switch K13 and the fourth switch K14 to be turned off;

[0111] S11: the second control unit CU2 controls the fifth switch K21 and the sixth switch K22 to be disconnected, and controls the seventh switch K23 and the eighth switch K24 to be closed, and the second power unit PU2 is in a battery side pre-charging waiting state;

[0112] S12: After receiving the pre-charging instruction from the control module 40, the second control unit CU2 controls the sixth switch K22 to close, so that the second battery pack B2 charges the second capacitor C2 through the second charging resistor R2;

[0113] S13: When the high-voltage charging time threshold T1 is reached, the second control unit CU2 controls the fifth switch K21 to close, controls the seventh switch K23 to open, and the control module 40 controls the circuit breaker QF to close;

[0114] S14: when the absolute value of the difference between the collector voltage of the fifth insulated gate bipolar transistor Q21 and the positive electrode voltage of the second battery pack B2 is less than the allowable voltage difference UDCM, the second control unit CU2 controls the seventh switch K23 to close;

[0115] S15: The control module 40 calculates the active power Pact in real time by sampling the three-phase voltage and current signals between the reactor L and the transformer T, and performs closed-loop power control on the second power unit PU2 in combination with the given active power Pgiven, thereby realizing the charge and discharge function test of the second battery pack B2;

[0116] S16: After the test is completed, the second capacitor C2 is discharged, the control module 40 controls the circuit breaker QF to disconnect, the second control unit CU2 controls the sixth switch K22, the seventh switch K23 and the eighth switch K24 to disconnect, the second control unit CU2 controls the second H-bridge 70 to invert and output three-phase AC power, and after the second capacitor C2 is discharged, the second control unit CU2 controls the fifth switch K21 to disconnect, and controls the insulated gate bipolar transistor gating signal of the second H-bridge 70 to reset.

[0117] In summary, the disclosed embodiment provides a high-voltage direct-mounted energy storage conversion power unit testing method. By controlling a first high-voltage direct-mounted energy storage conversion power test unit and a second high-voltage direct-mounted energy storage conversion power test unit, the high-voltage direct-mounted energy storage conversion power unit can be tested efficiently, accurately and quickly, including the charging and discharging of a battery pack and the power control of an energy storage conversion power unit. The method has the advantages of a simple structure and a simple and flexible method. The two energy storage conversion power units serve as each other for testing, which greatly improves the test efficiency.

[0118] The above-described embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present disclosure. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the attached claims.

Claims

1. A high-voltage direct-mounted energy storage power unit test system, characterized in that: The system comprises: an AC power supply module, a first high-voltage direct-mounted energy storage conversion power test unit, a second high-voltage direct-mounted energy storage conversion power test unit and a control module; The AC power supply module includes a three-phase AC power supply, a circuit breaker, a transformer and a reactor connected in series; The first high-voltage direct-mounted energy storage conversion power test unit is connected to the AC power supply module and is used for charging and discharging testing of the first power unit; The second high-voltage direct-mounted energy storage conversion power test unit is connected to the AC power supply module and is used for charging and discharging testing of the second power unit; The first high-voltage direct-mounted energy storage conversion power test unit and the second high-voltage direct-mounted energy storage conversion power test unit are in parallel connection; the two high-voltage direct-mounted energy storage conversion power test units are tested together; The control module is respectively connected to the first high-voltage direct-mounted energy storage conversion power test unit, the second high-voltage direct-mounted energy storage conversion power test unit and the control module, and is used for voltage and current sampling of the AC power supply module and power control of the first power unit and the second power unit; The first high-voltage direct-mounted energy storage conversion power test unit comprises: a first power unit and a first control unit connected to each other; The first power unit is used to provide or absorb variable current power; The first control unit is used to control the first power unit; The first power unit includes a first H-bridge, a first pre-charging circuit and a first battery pack connected in parallel; The first H-bridge comprises a first bridge arm and a second bridge arm connected in parallel; The first bridge arm includes a first insulated gate bipolar transistor and a second insulated gate bipolar transistor connected in series with each other; The second bridge arm comprises a third insulated gate bipolar transistor and a fourth insulated gate bipolar transistor connected in series with each other; A connection point between the emitter of the first insulated gate bipolar transistor and the collector of the second insulated gate bipolar transistor is connected to a first phase of the reactor; A connection point between the emitter of the third insulated gate bipolar transistor and the collector of the fourth insulated gate bipolar transistor is connected to the second phase of the reactor; The first pre-charging circuit includes: a first charging resistor, a first switch, a second switch, a third switch, a fourth switch and a first capacitor; The first capacitor and the second switch are connected in series between the collector of the first insulated gate bipolar transistor and the positive electrode of the first battery pack in sequence; The fourth switch is connected in series between the emitter of the second insulated gate bipolar transistor and the negative electrode of the first battery pack; The first switch and the first capacitor are connected in series in sequence between a connection point between the first charging resistor and the second switch and an emitter of the second insulated gate bipolar transistor; The third switch and the first capacitor are connected in series between the collector of the first insulated gate bipolar transistor and the emitter of the second insulated gate bipolar transistor in sequence; The first high-voltage direct-mounted energy storage conversion power test unit includes: a first DCDC and a second DCDC; The first DCDC and the second DCDC are used to supply power to the first control unit; The first DCDC is powered by the first battery pack; The second DCDC is powered by the first H-bridge; The second high-voltage direct-mounted energy storage conversion power test unit comprises: a second power unit and a second control unit connected to each other; The second power unit is used to provide or absorb variable current power; The second control unit is used to control the second power unit; The second power unit includes a second H-bridge, a second pre-charging circuit and a second battery pack connected in parallel; The second H-bridge comprises a third bridge arm and a fourth bridge arm connected in parallel; The third bridge arm comprises a fifth insulated gate bipolar transistor and a sixth insulated gate bipolar transistor connected in series with each other; The fourth bridge arm comprises a seventh insulated gate bipolar transistor and an eighth insulated gate bipolar transistor connected in series with each other; A connection point between the emitter of the fifth insulated gate bipolar transistor and the collector of the sixth insulated gate bipolar transistor is connected to the third phase of the reactor; A connection point between the emitter of the seventh insulated gate bipolar transistor and the collector of the eighth insulated gate bipolar transistor is connected to the second phase of the reactor; The second pre-charging circuit includes: a second charging resistor, a fifth switch, a sixth switch, a seventh switch, an eighth switch and a second capacitor; The second capacitor and the sixth switch are connected in series between the collector of the fifth insulated gate bipolar transistor and the positive electrode of the second battery pack in sequence; The eighth switch is connected in series between the emitter of the sixth insulated gate bipolar transistor and the negative electrode of the second battery pack; The fifth switch and the second capacitor are connected in series in sequence between a connection point between the second charging resistor and the sixth switch and an emitter of the sixth insulated gate bipolar transistor; The seventh switch and the second capacitor are connected in series between the collector of the fifth insulated gate bipolar transistor and the emitter of the sixth insulated gate bipolar transistor in sequence.

2. The high-voltage direct-mounted energy storage power unit test system according to claim 1 is characterized in that: The second high-voltage direct-mounted energy storage conversion power test unit includes: a third DCDC and a fourth DCDC; The third DCDC and the fourth DCDC are used to supply power to the second control unit; The third DCDC is powered by the second battery pack; The fourth DCDC is powered by the second H-bridge.

3. A method for testing a high-voltage direct-mounted energy storage power unit, characterized in that: The method is based on the high-voltage direct-mounted energy storage conversion power unit test system according to any one of claims 1 to 2, and the method comprises: The control module controls the circuit breaker to disconnect; The second control unit controls the fifth switch, the sixth switch, the seventh switch and the eighth switch to be disconnected; The first control unit controls the first switch and the second switch to be disconnected, and controls the third switch and the fourth switch to be closed, so that the first power unit is in a battery side pre-charging waiting state; After receiving the pre-charging instruction sent by the control module, the first control unit controls the second switch to close, so that the first battery pack charges the first capacitor through the first charging resistor; When the charging time threshold is reached, the first control unit controls the first switch to close, controls the third switch to open, and the control module controls the circuit breaker to close; When the absolute value of the difference between the collector voltage of the first insulated gate bipolar transistor and the positive electrode voltage of the first battery pack is less than the allowable voltage difference, the first control unit controls the third switch to be closed; The control module calculates the active power in real time by sampling the three-phase voltage and current signals between the reactor and the transformer, and performs closed-loop power control on the first power unit in combination with the given active power, thereby realizing the charge and discharge function test of the first battery pack; After the test is completed, a discharge operation is performed on the first capacitor, the control module controls the circuit breaker to disconnect, the first control unit controls the second switch, the third switch and the fourth switch to disconnect, the first control unit controls the first H-bridge inverter to output three-phase AC power, and after the first capacitor is discharged, the first control unit controls the first switch to disconnect and controls the insulated gate bipolar transistor gating signal of the first H-bridge to reset.

4. The high-voltage direct-mounted energy storage conversion power unit testing method according to claim 3 is characterized in that: The method further comprises: The control module controls the circuit breaker to disconnect; The first control unit controls the first switch, the second switch, the third switch and the fourth switch to be disconnected; The second control unit controls the fifth switch and the sixth switch to be disconnected, and controls the seventh switch and the eighth switch to be closed, so that the second power unit is in a battery side pre-charging waiting state; After receiving the pre-charging instruction sent by the control module, the second control unit controls the sixth switch to be closed, so that the second battery pack charges the second capacitor through the second charging resistor; When the charging time threshold is reached, the second control unit controls the fifth switch to close, controls the seventh switch to open, and the control module controls the circuit breaker to close; When the absolute value of the difference between the collector voltage of the fifth insulated gate bipolar transistor and the positive electrode voltage of the second battery pack is less than the allowable voltage difference, the second control unit controls the seventh switch to be closed; The control module calculates the active power in real time by sampling the three-phase voltage and current signals between the reactor and the transformer, and performs closed-loop power control on the second power unit in combination with the given active power, thereby realizing the charge and discharge function test of the second battery pack; After the test is completed, a discharge operation is performed on the second capacitor, the control module controls the circuit breaker to disconnect, the second control unit controls the sixth switch, the seventh switch and the eighth switch to disconnect, the second control unit controls the second H-bridge inverter to output three-phase AC power, and after the second capacitor is discharged, the second control unit controls the fifth switch to disconnect and controls the insulated gate bipolar transistor gating signal of the second H-bridge to reset.

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