Starting test method and system of high-voltage direct-hanging energy storage system and electronic equipment

Abstract

The application discloses a starting test method, system and electronic equipment of a high-voltage direct-hanging energy storage system. The starting test method comprises the following steps: when the high-voltage direct-hanging energy storage system enters an SVG operation mode, charging a direct-current capacitor in a power unit according to a first preset method to make the power unit electrified, and then starting the SVG operation mode; and when the high-voltage direct-hanging energy storage system exits the SVG operation mode, discharging the direct-current capacitor in a low-voltage simulation mode according to a second preset method, wherein different circuit loops are adopted when the direct-current capacitor is charged and when the direct-current capacitor is discharged. The application realizes direct-current soft starting logic test and SVG function test of the system, solves the SVG starting logic problem of the 35kV high-voltage direct-hanging energy storage system, avoids safety hazards, reduces the debugging waiting time, and improves the debugging efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, and in particular to a starting test method and system of a high-voltage direct-hanging energy storage system and an electronic device. BACKGROUND

[0002] The future energy storage industry is closely combined with solar energy, wind energy and new energy vehicles, and is expected to bring great development opportunities to the energy storage industry. At present, "photovoltaic + energy storage" has become a typical mode in the application scenario of energy storage systems. The increasing of photovoltaic and energy storage power stations gradually increases the requirement for the power conversion efficiency of the converter. In order to reduce cost and increase efficiency, a technical solution of high direct-current voltage input and high alternating-current voltage (35KV) output grid connection is proposed. The high-voltage direct-hanging energy storage system is widely used in various scenes such as power generation side, power grid side and user side due to its high degree of modularity, low harmonic content and high energy conversion efficiency.

[0003] In related technologies, the grid connection scheme of 6kV and 10kV energy storage systems is becoming mature. When the conventional 6kV and 10kV high-voltage direct-hanging energy storage system is debugged in the SVG mode (Static Var Generator, high-voltage dynamic reactive power compensation generator), the power unit driving power supply is powered by an isolation transformer. However, due to the high insulation strength requirement, the 35kV system is suitable for using self-power supply to power the power module and internal contactor.

[0004] However, the existing 35kV high-voltage direct-hanging energy storage system has the following problems in the starting test before leaving the factory: first, the conventional alternating-current soft-start test method is not suitable for the 35kV system with self-power supply, and the starting logic needs to be improved; second, the direct-current soft-start method is time-consuming and cumbersome and has safety hazards; third, in order to improve the system operation efficiency, the SVG mode debugging needs to be discharged after the direct-current capacitor is discharged, which takes a long time. SUMMARY

[0005] The embodiments of the present application provide a starting test method and system of a high-voltage direct-hanging energy storage system and an electronic device, so as to achieve the technical effects of solving the SVG starting logic problem of the 35kV high-voltage direct-hanging energy storage system, avoiding safety hazards, reducing the debugging waiting time, and improving the debugging efficiency.

[0006] According to a first aspect of the present application, a starting test method of a high-voltage direct-hanging energy storage system is provided, which is applied to a high-voltage direct-hanging energy storage system, the high-voltage direct-hanging energy storage system includes a plurality of power unit chain links, the plurality of power unit chain links are connected in series and directly hung on a high-voltage power grid, each power unit chain link includes a power unit and an energy storage battery unit, and the starting test method includes:

[0007] When the high-voltage direct-hanging energy storage system enters the SVG operation mode, the DC capacitor in the power unit is charged according to a first preset method to make the power unit powered on, and then the SVG operation mode is started;

[0008] When the high-voltage direct-hanging energy storage system exits the SVG operation mode, the DC capacitor is discharged in a low-voltage simulation mode according to a second preset method, wherein different circuit loops are used when the DC capacitor is charged and when the DC capacitor is discharged.

[0009] Optionally, when the high-voltage direct-hanging energy storage system enters the SVG operation mode, the DC capacitor in the power unit is charged according to a first preset method to make the power unit powered on, and then the SVG operation mode is started, comprising:

[0010] Disconnecting the isolating switch in the power unit chain to disconnect the power unit and the energy storage battery unit, and short-circuiting the DC soft start circuit in the power unit;

[0011] Controlling the first high-voltage alternating current circuit breaker in the high-voltage direct-hanging energy storage system to close, and detecting the high-voltage power grid access signal in the high-voltage direct-hanging energy storage system.

[0012] Optionally, the circuit loop when the DC capacitor is charged comprises a high-voltage power grid, an alternating current soft start resistor, and a DC capacitor, and the charging of the DC capacitor in the power unit to make the power unit powered on comprises:

[0013] Controlling the second high-voltage alternating current circuit breaker to close, so that the high-voltage power grid charges the DC capacitor through the alternating current soft start resistor in a non-controlled rectification mode.

[0014] Optionally, the power unit further comprises a DC / DC power supply module,

[0015] When the DC capacitor voltage is stable and the DC / DC power supply module is powered on through the DC capacitor, the DC / DC power supply module supplies power to the power unit.

[0016] Optionally, after the DC / DC power supply module is powered on and before the SVG operation mode is started, further comprising:

[0017] Controlling the first DC contactor and the second DC contactor in the power unit to complete the logic test of the DC soft start circuit;

[0018] Controlling the alternating current bypass contactor of the alternating current soft start resistor in the high-voltage direct-hanging energy storage system to close to complete standby.

[0019] Optionally, the circuit loop when the DC capacitor discharges comprises: the DC capacitor, an AC soft start resistor, and a ground terminal.

[0020] When the high-voltage direct-hanging energy storage system exits the SVG operation mode, the DC capacitor is discharged in a low-voltage simulation mode according to a second preset method, and the method comprises:

[0021] The high-voltage direct-hanging energy storage system is controlled to enter a standby state, and then the high-voltage direct-hanging energy storage system is controlled to stop.

[0022] The operation mode of the high-voltage direct-hanging energy storage system is modified to a low-voltage simulation mode, and a ground knife switch in the high-voltage direct-hanging energy storage system is controlled to close to form a circuit loop when the DC capacitor discharges.

[0023] After the high-voltage direct-hanging energy storage system successfully enters the standby state, the closing state signal of an AC bypass contactor is short-circuited, and the AC bypass contactor is disconnected.

[0024] Optionally, before the operation mode of the high-voltage direct-hanging energy storage system is modified to the low-voltage simulation mode, the method further comprises:

[0025] The first high-voltage AC circuit breaker and the second high-voltage AC circuit breaker in the high-voltage direct-hanging energy storage system are controlled to open, and the AC bypass contactor and the second DC contactor in the power unit are controlled to disconnect, so that the voltage of the DC capacitor decreases after discharging through the voltage-sharing resistor.

[0026] Optionally, the start test method further comprises:

[0027] After the high-voltage direct-hanging energy storage system enters the low-voltage simulation operation state, the DC capacitor completes discharging through the AC soft start resistor in the power unit.

[0028] According to a second aspect of the present application, a high-voltage direct-hanging energy storage system is provided, and the system comprises:

[0029] A start module is configured to charge a DC capacitor in a power unit to electrify the power unit according to a first preset method when the high-voltage direct-hanging energy storage system enters an SVG operation mode, and then start the SVG operation mode.

[0030] An exit module is configured to discharge the DC capacitor in a low-voltage simulation mode according to a second preset method when the high-voltage direct-hanging energy storage system exits the SVG operation mode, wherein different circuit loops are used when the DC capacitor is charged and when the DC capacitor is discharged.

[0031] According to a third aspect of the present application, an electronic device is provided, comprising: a processor; and a memory arranged to store computer-executable instructions that, when executed, cause the processor to perform the start-up test method of any of the above.

[0032] According to a fourth aspect of the present application, a computer-readable storage medium is provided, storing one or more programs that, when executed by a processor, implement the start-up test method of any of the above.

[0033] The above at least one technical solution adopted by the embodiments of the present application can achieve the following beneficial effects:

[0034] A start-up test method of a high-voltage direct-hanging energy storage system is provided. First, an AC soft start test method in an SVG operation mode is designed for a 35kV high-voltage direct-hanging energy storage system powered by a self-power supply mode. When the high-voltage direct-hanging energy storage system enters the SVG operation mode, the DC capacitor in the power unit is charged to power on the power unit, thereby completing the logic function test of the DC soft start loop and the SVG debugging work, solving the SVG start-up logic problem and avoiding safety hazards. Second, to speed up the discharge speed of the DC capacitor of the system, a system discharge method operating in a low-voltage simulation mode is designed. When the high-voltage direct-hanging energy storage system exits the SVG operation mode, the DC capacitor is discharged in the low-voltage simulation mode, thereby effectively reducing the waiting time at the end of debugging and improving the debugging efficiency.

[0035] The above description is only a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application, the content of the specification can be implemented, and in order to enable the above and other purposes, features and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0036] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0037] Figure 1 A flowchart of the start-up test method of the high-voltage direct-hanging energy storage system in an embodiment of the present application;

[0038] Figure 2 A structure diagram of the 35kV high-voltage direct-hanging energy storage system in an embodiment of the present application;

[0039] Figure 3 A circuit principle diagram of the power unit chain in an embodiment of the present application;

[0040] Figure 4 Flowchart for the high-voltage direct-hanging energy storage system in one embodiment of the present application entering the SVG operation mode;

[0041] Figure 5 Flowchart for the high-voltage direct-hanging energy storage system in one embodiment of the present application exiting the SVG operation mode;

[0042] Figure 6 Schematic diagram of a module in the high-voltage direct-hanging energy storage system in one embodiment of the present application;

[0043] Figure 7 Schematic diagram of the structure of an electronic device in one embodiment of the present application;

[0044] Figure 8 Schematic diagram of the structure of a computer readable storage medium in one embodiment of the present application.

[0045] In the figure, Vsa, Vsb, and Vsc represent three 35kV high-voltage buses respectively; QF1 represents a first high-voltage AC circuit breaker; QF2 represents a second high-voltage AC circuit breaker; K1 represents a grounding knife switch; K2 represents an AC bypass contactor; R P represents an AC soft start resistor, L0 represents an AC reactor, SM N (N = 1, 2, 3…) represents a power unit link;

[0046] V O represents an AC side voltage; I O represents an AC side current; C1 represents a DC capacitor, R m represents a voltage equalization resistor; L1 represents a smoothing reactor; J1 represents a first DC contactor; J2 represents a second DC contactor; R1 represents a pre-charge resistor; K m represents a disconnector; R represents the internal resistance of an energy storage battery unit; B represents an energy storage battery unit; DC / DC represents a DC / DC power supply module. DETAILED DESCRIPTION

[0047] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be described below in conjunction with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0048] The technical solutions provided by the embodiments of the present application will be described in detail below in conjunction with the drawings.

[0049] In a high-voltage direct-mount energy storage system, the DC side of a power unit is connected to an energy storage battery unit to form a power unit chain link. This energy storage battery unit is also known as a high-voltage battery cluster, which is generally composed of multiple battery packs connected in series. High-voltage direct-mount energy storage systems achieve power conversion by connecting power unit chains in series, resulting in a high-capacity and highly modular system. After the high-voltage direct-mount energy storage system is fully assembled, preliminary logic function testing is often required to ensure safe and reliable system operation. This is generally performed in the factory's SVG mode, with the battery system placed in bypass mode.

[0050] As previously mentioned, due to the high insulation strength requirements of 35kV systems, it is best to use a battery cluster to power the power modules and internal contactors. Since the battery system is not connected when the system operates in factory SVG mode, the power unit drive power supply can only be obtained from the capacitor side. However, the startup logic during the startup test of existing 35kV high-voltage direct-mounted energy storage systems needs to be improved, and there are significant safety risks and low operating efficiency.

[0051] Based on this, an embodiment of the present application provides a startup test method for a high-voltage direct-mounted energy storage system. For a 35kV high-voltage direct-mounted energy storage system, an AC soft-start test method in SVG operation mode and a system discharge method in low-voltage simulation mode are designed to achieve the technical effect of solving the SVG startup logic problem of the 35kV system, avoiding safety hazards, reducing debugging waiting time, and improving debugging efficiency.

[0052] The technical concept of the present application is that, first, when the high-voltage direct-mounted energy storage system enters the SVG operation mode, the DC capacitor in the power unit is charged to energize the power unit, thereby completing the logic function test of the DC soft start circuit and the SVG debugging work, solving the SVG startup logic problem and avoiding safety hazards; secondly, when the high-voltage direct-mounted energy storage system exits the SVG operation mode, the DC capacitor is discharged in the low-voltage simulation mode, thereby accelerating the discharge speed of the system DC capacitor, effectively reducing the waiting time for the end of debugging, and improving the debugging efficiency.

[0053] The following describes in detail the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings.

[0054] In one embodiment of the present application, Figure 2 As shown, the high voltage direct-mounted energy storage system includes a plurality of power unit links (SM1, SM2, ... SM N That is, N power unit links), Vsa, Vsb, and Vsc are 35kV high-voltage busbars, QF1 is the first high-voltage AC circuit breaker, QF2 is the second high-voltage AC circuit breaker, K1 is the grounding switch, K2 is the AC bypass contactor, and R PL0 is an AC reactor. The high-voltage directly-hung energy storage system can realize power conversion by connecting the power units in series, and the plurality of power unit links form three power conversion links and are directly hung on the 35kV high-voltage power grid through the AC reactor L0.

[0055] In one embodiment of the present application, as shown in Figure 3 each power unit link includes a power unit and an energy storage battery unit, as shown in Figure 3 the circuit principle diagram of the power unit link, V O represents the AC side voltage; I O represents the AC side current, each power unit link includes a full-bridge module composed of 4 fully-controlled devices IGBT (Insulated Gate Bipolar Transistor) and 4 diodes in anti-parallel connection with the IGBT, a DC capacitor C1, a voltage equalization resistor R m , a smoothing reactor L1, a first DC contactor J1, a second DC contactor J2, a pre-charge resistor R1, a disconnector K m , an internal resistance R of the energy storage battery unit, and an energy storage battery unit B.

[0056] As shown in Figure 1 , the start-up test method includes the following steps S110 to S120:

[0057] Step S110, when the high-voltage directly-hung energy storage system enters the SVG operation mode, the DC capacitor in the power unit is charged according to a first preset method to make the power unit get electricity, and then the SVG operation mode is started.

[0058] When the 35kV high-voltage directly-hung energy storage system is formally put into operation, the power unit driving module is powered by taking power from the energy storage battery power source B, the power source is taken from the energy storage battery unit after the disconnector Km is closed, and the actual driving power source is obtained after being converted by the DC / DC power module. It can be understood that when the system is formally put into operation, the first DC contactor J1 needs to be closed to connect the DC soft start circuit, and then the first DC contactor J1 of the power unit link is controlled to be disconnected, and the disconnector K m and the second DC contactor J2 of the power unit link are controlled to be closed.

[0059] However, in this embodiment, when the PCS control logic (Power Conversion System) and the SVG function test are carried out in the factory, the energy storage battery unit is not connected, and Km is in the open state. Since the control power of the DC contactors J1 and J2 comes from the DC / DC power module, it is necessary to bypass the DC soft start circuit by means of short-circuiting wiresFigure 3 The dashed line in the figure is a short-circuit line, so that when the DC capacitor C1 is charged, the power module can be powered, and the system is started through an AC soft start mode, so that the DC contactor can be further controlled to act.

[0060] It is worth noting that in the factory test stage in the embodiment, before starting the SVG operation mode, a logic test of the DC soft start circuit is needed to determine the feedback state of J1 and J2, and then the SVG operation mode is started for debugging, testing and aging.

[0061] In step S120, when the high-voltage direct-hanging energy storage system exits the SVG operation mode, the DC capacitor is discharged in a low-voltage simulation mode according to a second preset method, wherein different circuit loops are used when the DC capacitor is charged and when the DC capacitor is discharged.

[0062] In an embodiment of the present application, in order to speed up the discharging speed of the DC capacitor of the system, an AC soft start resistor R P and the discharge circuit formed by the grounding knife switch K1 is used to discharge the DC capacitor C1 in the low-voltage simulation mode, thereby completing the work of the system exiting the operation. It can be understood that after the above DC soft start logic test and SVG function test are completed, the system can be sent to the energy storage application site for further commissioning work.

[0063] As can be seen, by using the above-mentioned AC soft start test method in the SVG operation mode and the system discharging method in the low-voltage simulation mode, on the one hand, the DC soft start logic test and the SVG function test of the system are completed, and the SVG start logic problem of the 35kV system is solved; on the other hand, the safety hidden danger is avoided, the debugging waiting time is greatly reduced, and the debugging efficiency is improved.

[0064] In an embodiment of the present application, in combination with Figure 2 and Figure 3 When the high-voltage direct-hanging energy storage system enters the SVG operation mode, the DC capacitor in the power unit is charged to power the power unit according to a first preset method, including: breaking the disconnecting switch K m in the power unit, and short-circuiting the DC soft start circuit in the power unit; controlling the first high-voltage AC circuit breaker QF1 in the high-voltage direct-hanging energy storage system to close, and detecting the high-voltage power grid access signal in the high-voltage direct-hanging energy storage system, at this time, the standby work is ready.

[0065] Further, the circuit loop when the DC capacitor is charged includes: a high-voltage power grid, an AC soft start resistor R P, the DC capacitor in the power unit is charged to electrify the power unit, comprising: controlling the second high-voltage AC circuit breaker QF2 to close, so that the high-voltage power grid passes through the AC soft start resistor R P The DC capacitor C1 is charged in a non-controlled rectification mode. It can be understood that the non-controlled rectification mode can use the unidirectional conductivity of the rectifier diode to convert the applied AC voltage into DC voltage, and when the input AC voltage is constant, the DC voltage obtained on the load cannot be adjusted. Therefore, when the DC capacitor C1 is charged by the grid voltage, the entire system is in the AC soft start process.

[0066] Further, the power unit further comprises a DC / DC power module, when the DC capacitor C1 voltage is stable, and the DC / DC power module is electrified by the DC capacitor C1, the DC / DC power module is used to supply power to the power unit, so that the state feedback detection of J1 and J2 can be further realized, and the DC soft start logic test is completed.

[0067] In an embodiment of the present application, after the DC / DC power module is electrified and before the SVG operation mode is started, the first DC contactor J1 and the second DC contactor J2 in the power unit are controlled to complete the logic test of the DC soft start circuit; the AC soft start resistor R P of the high-voltage direct-hanging energy storage system is controlled to close to complete standby. At this time, the SVG operation mode can be started for debugging and other work.

[0068] In an embodiment of the present application, the circuit loop when the DC capacitor is discharged comprises: the DC capacitor C1, the AC soft start resistor R P , and the ground knife switch K1 of the ground end. When the high-voltage direct-hanging energy storage system exits the SVG operation mode, the DC capacitor is discharged in the low-voltage simulation mode according to a second preset method, comprising:

[0069] controlling the high-voltage direct-hanging energy storage system to enter a standby state, and then controlling the high-voltage direct-hanging energy storage system to stop; modifying the operation mode of the high-voltage direct-hanging energy storage system to a low-voltage simulation mode, and controlling the ground knife switch K1 in the high-voltage direct-hanging energy storage system to close to form a circuit loop when the DC capacitor C1 is discharged; after the high-voltage direct-hanging energy storage system is successfully in standby, the closing state signal of the AC bypass contactor K2 is short-circuited, and the AC bypass contactor K2 is disconnected.

[0070] Specifically, the low-voltage simulation mode can control the PCS system to output voltage in the form of voltage source, close the grounding knife switch K1 to form a DC capacitor discharge circuit; then press the standby button, and short the AC bypass contactor K2 in the closed state signal to prevent the manual opening of K2 from causing a malfunction shutdown and exiting the standby state. Then manually open K2, at which time the system will consider that K2 is still in the closed state, but in fact K2 has been opened, so the above-mentioned AC discharge circuit will pass through the AC soft start resistor R P without being bypassed by K2.

[0071] Finally, press the start button, and after the high-voltage direct-hanging energy storage system enters the low-voltage simulation running state, the DC capacitor C1 discharges through the AC soft start resistor R P in the power unit, and the energy is consumed by the PCS in the form of voltage source. When the capacitor voltage drops to 0, press the emergency stop button and remove the short circuit line, and the 35kV high-voltage direct-hanging energy storage system startup test is completed. P

[0072] In an embodiment of the present application, before modifying the operation mode of the high-voltage direct-hanging energy storage system to a low-voltage simulation mode, it further includes: controlling the first high-voltage AC circuit breaker QF1 and the second high-voltage AC circuit breaker QF2 in the high-voltage direct-hanging energy storage system to be opened, and controlling the AC bypass contactor K2 and the second DC contactor J2 in the power unit to be disconnected, so that the voltage of the DC capacitor is discharged through the MΩ level voltage equalizing resistor R m after discharge.

[0073] As shown in Figure 4 the SVG operation mode startup test method (first preset method) in the embodiment of the present application includes the following steps:

[0074] First, start the test, set the system operation mode to SVG operation mode, manually disconnect the disconnecting switch Km, connect the DC side short circuit line, and control the grid side AC circuit breaker QF1 to be closed. The PCS system detects the access signal of the high-voltage power grid;

[0075] Secondly, press the standby button, and the PCS controller sends a QF2 closing signal and gets correct state feedback. The grid voltage charges the DC capacitor C1 in the form of uncontrolled rectification through the AC soft start resistor R P , and the entire system is in the process of AC soft start;

[0076] ​Then, after T1 time, the DC capacitor C1 voltage is normally stabilized, the DC / DC power module is powered, and the power unit is powered; the DC contactor J1 is controlled to be closed; after T2 time, the DC contactor J2 is controlled to be closed, and after T3 time, the disconnector J1 is controlled, and the DC soft start logic test is completed.

[0077] Finally, after T4 time, the AC bypass contactor K2 is controlled to be closed; standby is successful, and the SVG operation mode is started.

[0078] Further, as shown in the low-voltage simulation mode in the embodiment of the application, the system discharge method (the second preset method) comprises the following steps: Figure 5

[0079] Firstly, after the SVG operation mode debugging is completed, the standby button is pressed, the system enters the standby state; the stop button is pressed, the QF1 and QF2 are controlled by the PCS to be disconnected, the AC bypass contactor K2 is disconnected, the DC contactor J2 is disconnected, and the system is disconnected from the high voltage;

[0080] Then, the system operation mode is modified to the low-voltage simulation operation mode, the grounding knife switch K1 is closed, and the DC capacitor discharge loop is constructed.

[0081] After that, the standby button is pressed, after the standby is successful, the AC bypass contactor K2 closing state signal is short-circuited, and K2 is manually disconnected.

[0082] Finally, the start button is pressed, the system enters the low-voltage simulation operation state, when the DC capacitor C1 voltage drops to 0, the emergency stop button is pressed, the short-circuiting wire is removed, and the start test is completed.

[0083] The embodiment of the application also provides a high-voltage direct-hanging energy storage system 600, as shown in the figure, the system comprises: Figure 6

[0084] The start module 610 is used for charging the DC capacitor in the power unit to make the power unit powered on when the high-voltage direct-hanging energy storage system enters the SVG operation mode according to the first preset method, and then starting the SVG operation mode;

[0085] When the 35kV high-voltage direct-hanging energy storage system is formally put into operation, the power unit driving module is powered by the energy storage battery power supply B, the power supply is taken from the energy storage battery unit after the isolation switch Km is closed, and the driving power supply actually used is obtained after the DC / DC power module is converted. It can be understood that when the system is formally put into operation, the first DC contactor J1 needs to be closed to connect the DC soft start circuit, and then the first DC contactor J1 of the power unit chain is controlled to be disconnected, and the isolation switch K m , the second DC contactor J2 is controlled to be closed. ​​

[0086] However, in the present embodiment, when the control logic (Power Conversion System) and SVG function test of the PCS are carried out in the factory, the energy storage battery unit is not connected, and Km is in the open state. Since the control power supply of the DC contactors J1 and J2 comes from the DC / DC power supply module, it is necessary to bypass the DC soft start circuit by means of a short circuit line (the dashed line in FIG. 6). Figure 3 When the voltage of the DC capacitor C1 rises, the power supply module can be powered, and the system is started through AC soft start, so that the action of the DC contactor can be further controlled.

[0087] It is worth noting that, in the factory test stage of the present embodiment, before starting the SVG operation mode, the logic test of the DC soft start circuit is also needed to determine the feedback state of J1 and J2, and finally the SVG operation mode is started for debugging, testing and aging.

[0088] The exit module 620 is configured to discharge the DC capacitor in a low-voltage simulation mode according to a second preset method when the high-voltage direct-hanging energy storage system exits the SVG operation mode, wherein the DC capacitor is charged and discharged in different circuit loops.

[0089] In an embodiment of the present application, in order to accelerate the discharging speed of the DC capacitor of the system, a discharging circuit formed by the AC soft start resistor R P and the grounding knife switch K1 is designed to discharge the DC capacitor C1 in the low-voltage simulation mode, thereby completing the work of exiting the operation of the system. It can be understood that, after the above-mentioned DC soft start logic test and SVG function test are completed, the system can be sent to the energy storage application site for further commissioning work.

[0090] In an embodiment of the present application, the start module 610 is configured to,

[0091] When the high-voltage direct-hanging energy storage system enters the SVG operation mode, the DC capacitor in the power unit is charged according to a first preset method to power the power unit, including:

[0092] disconnecting the disconnector in the power unit, and short-circuiting the DC soft start circuit in the power unit;

[0093] controlling the first high-voltage AC circuit breaker in the high-voltage direct-hanging energy storage system to close, and detecting the high-voltage power grid access signal in the high-voltage direct-hanging energy storage system.

[0094] In an embodiment of the present application, in the start module 610,

[0095] The circuit loop when the direct current capacitor is charged includes: a high-voltage power grid, an alternating current soft start resistor and a direct current capacitor, the charging of the direct current capacitor in the power unit to electrify the power unit includes: controlling the second high-voltage alternating current breaker to close, so that the high-voltage power grid charges the direct current capacitor in a non-controlled rectification mode through the alternating current soft start resistor.

[0096] In an embodiment of the present application, in the starting module 610,

[0097] The power unit further includes a DC / DC power supply module, when the direct current capacitor voltage is stable, and the DC / DC power supply module is electrified through the direct current capacitor, the DC / DC power supply module is used to supply power to the power unit.

[0098] In an embodiment of the present application, in the starting module 610,

[0099] After the DC / DC power supply module is electrified and before the SVG operation mode is started, further comprising:

[0100] controlling the first direct current contactor and the second direct current contactor in the power unit to complete the logic test of the direct current soft start circuit; and controlling the alternating current bypass contactor of the alternating current soft start resistor in the high-voltage direct-hanging energy storage system to close, so as to complete standby.

[0101] In an embodiment of the present application, in the exit module 620,

[0102] The circuit loop when the direct current capacitor is discharged includes: a direct current capacitor, an alternating current soft start resistor and a grounding terminal,

[0103] When the high-voltage direct-hanging energy storage system exits the SVG operation mode, the direct current capacitor is discharged in a low-voltage simulation mode according to a second preset method, including:

[0104] controlling the high-voltage direct-hanging energy storage system to enter a standby state, and then controlling the high-voltage direct-hanging energy storage system to stop;

[0105] modifying the operation mode of the high-voltage direct-hanging energy storage system to a low-voltage simulation mode, and controlling the grounding knife switch in the high-voltage direct-hanging energy storage system to close to form the circuit loop when the direct current capacitor is discharged;

[0106] After the high-voltage direct-hanging energy storage system is successfully in standby, the closing state signal of the alternating current bypass contactor is short-circuited, and the alternating current bypass contactor is disconnected.

[0107] In an embodiment of the present application, in the exit module 620,

[0108] Before the operation mode of the high-voltage direct-hanging energy storage system is modified to a low-voltage simulation mode, the method further comprises:

[0109] The first high-voltage alternating-current circuit breaker and the second high-voltage alternating-current circuit breaker in the high-voltage direct-hanging energy storage system are controlled to be tripped, and the alternating-current bypass contactor and the second direct-current contactor in the power unit are controlled to be tripped, so that the voltage of the direct-current capacitor is discharged through the voltage-sharing resistor.

[0110] In an embodiment of the present application, in the exit module 620,

[0111] After the high-voltage direct-hanging energy storage system enters the low-voltage simulation operation state, the direct-current capacitor is discharged through the alternating-current soft-start resistor in the power unit.

[0112] It should be noted that the high-voltage direct-hanging energy storage system described above can realize each step of the start-up test method of the high-voltage direct-hanging energy storage system provided in the foregoing embodiments, and the related explanations of the high-voltage direct-hanging energy storage system are applicable to the start-up test method of the high-voltage direct-hanging energy storage system, which will not be described here.

[0113] In summary, the technical solution of the present application at least achieves the following technical effects:

[0114] Firstly, the alternating-current soft-start test method in the SVG operation mode is designed for the 35kV high-voltage direct-hanging energy storage system based on the self-power supply mode, when the high-voltage direct-hanging energy storage system enters the SVG operation mode, the direct-current capacitor in the power unit is charged to make the power unit powered, thereby completing the logic function test of the direct-current soft-start loop and the SVG debugging work, solving the SVG start-up logic problem and avoiding safety hazards; secondly, in order to speed up the discharging speed of the system direct-current capacitor, a system discharging method in the low-voltage simulation mode is designed, when the high-voltage direct-hanging energy storage system exits the SVG operation mode, the direct-current capacitor is discharged in the low-voltage simulation mode, thereby effectively reducing the waiting time at the end of debugging and improving the debugging efficiency.

[0115] The algorithms and displays presented herein are not inherently related to any particular computer, virtual apparatus, or other apparatus. Various general purpose devices can be used with these teachings based on the instructions given herein. General purpose devices can be constructed to implement the structures described above with the required structure. Also, the present application is not intended to be limited to any particular programming language. It will be appreciated that there are many programming languages that can be used to implement the teachings described herein, and any such programming language can be used. The descriptions of specific languages herein are merely provided to disclose a best mode of the present application.

[0116] In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been described in detail in order not to obscure the understanding of this description.

[0117] Similarly, it is to be understood that the embodiments of the present application can be used in the exact form disclosed herein, carried in parts, used, or carried out but not used, in variations of one or more embodiments suggested herein, and / or in variations of one or more embodiments of the prior art disclosed in this description. It is to be understood that such modifications are to be considered as falling within the scope of the present application comprising the embodiments disclosed herein.

[0118] Those skilled in the art will appreciate that the modules in the apparatuses in the embodiments can be adapted and placed in one or more apparatuses other than the embodiments. The modules or units or components in the embodiments can be combined into one module or unit or component, and further can be divided into multiple sub-modules or sub-units or sub-components. Except that at least some of such features and / or processes or units are mutually exclusive, any combination of all the features disclosed in the present specification (including the accompanying claims, abstract and drawings), and all processes or units of any methods or apparatuses disclosed so far can be adopted. Unless explicitly stated, each feature disclosed in the present specification (including the accompanying claims, abstract and drawings) can be replaced by alternative features that serve the same, equivalent or similar purpose.

[0119] Further, those skilled in the art will appreciate that a combination of features of different embodiments can mean within the scope of the present application and form a different embodiment. For example, in the following claims, any one of the claimed embodiments can be used in any combination.

[0120] The various component embodiments of the present application can be implemented in hardware, or as software modules running in one or more processors, or combinations thereof. Those skilled in the art will appreciate that a microprocessor or a digital signal processor (DSP) can be used in practice to implement some or all of the functionality of some or all of the components in the high voltage direct plug-in energy storage system according to the embodiments of the present application. The present application can also be implemented as a device or apparatus program (e.g., a computer program and a computer program product) for performing part or all of the methods described herein. Such a program implementing the present application can be stored on a computer readable medium, or can be in the form of one or more signals. Such signals can be downloaded from an Internet website, or provided on a carrier medium, or in any other form.

[0121] For example, Figure 7 A structural schematic diagram of an electronic device according to an embodiment of the present application is shown. The electronic device 700 comprises a processor 710 and a memory 720 arranged to store computer executable instructions (computer readable program code). The memory 720 can be an electronic memory such as a flash memory, an EEPROM (Electrically Erasable Programmable Read-Only Memory), an EPROM, a hard disk, or a ROM. The memory 720 has a storage space 730 storing computer readable program code 731 for performing any of the method steps in the methods described above. For example, the storage space 730 for storing computer readable program code can comprise individual computer readable program codes 731 for implementing the various steps in the methods above, respectively. The computer readable program code 731 can be read from or written to one or more computer program products. These computer program products include program code carriers such as a hard disk, a compact disk (CD), a memory card, or a floppy disk. Such computer program products are typically computer-readable storage media as for example Figure 7 a computer readable storage medium is shown.

[0122] Figure 8 A structural schematic diagram of a computer readable storage medium according to an embodiment of the present application is shown. The computer readable storage medium 800 stores computer readable program code 731 for performing the method steps according to the present application, which can be read by the processor 710 of the electronic device 700, and when the computer readable program code 731 is run by the electronic device 700, causes the electronic device 700 to perform the various steps in the methods described above, in particular, the computer readable program code 731 stored by the computer readable storage medium can perform the methods shown in any of the embodiments described above. The computer readable program code 731 can be compressed in a suitable form.

[0123] It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word 'comprising' does not exclude the presence of elements or steps other than those listed in a claim. The word 'a' or 'an' preceding an element does not exclude the presence of a plurality of such elements. The application can be implemented by means of both hardware and software, and any combination thereof. In a unitary claim, several devices or sub-claims can be listed, comprising different combinations of elements. The word 'comprise', 'comprising', 'comprises' and the like do not exclude the presence of elements or steps other than those listed in a claim. The word 'first','second', 'third' etc. do not imply any order. The terminology includes the words above, derivatives thereof and terms of similar import.

Claims

1. A startup test method for a high-voltage direct-mounted energy storage system, characterized in that: Applied to a high-voltage direct-mounted energy storage system, the high-voltage direct-mounted energy storage system includes a plurality of power unit links, which are connected in series and then directly mounted on a high-voltage power grid. Each of the power unit links includes a power unit and an energy storage battery unit. The startup test method includes: When the high-voltage direct-mounted energy storage system enters the SVG operation mode, the DC capacitor in the power unit is charged according to a first preset method to energize the power unit, and then the SVG operation mode is started; When the high-voltage direct-mounted energy storage system exits the SVG operation mode, the DC capacitor is discharged in a low-voltage simulation mode according to a second preset method, wherein different circuit loops are used when charging the DC capacitor and when discharging the DC capacitor; When the high-voltage direct-mounted energy storage system enters the SVG operation mode, charging the DC capacitor in the power unit according to a first preset method so that the power unit is powered includes: Disconnecting the isolating switch in the power unit chain to disconnect the power unit from the energy storage battery unit, and short-circuiting the DC soft start circuit in the power unit; Controlling the closing of a first high-voltage AC circuit breaker in the high-voltage direct-hook energy storage system and detecting a high-voltage grid access signal in the high-voltage direct-hook energy storage system; The circuit loop when the DC capacitor is discharging includes: a DC capacitor, an AC soft-start resistor, and a ground terminal. When the high-voltage direct-mounted energy storage system exits the SVG operation mode, the DC capacitor is discharged in the low-voltage simulation mode according to a second preset method, including: Controlling the high-voltage direct-mounted energy storage system to enter a standby state, and then controlling the high-voltage direct-mounted energy storage system to shut down; Modify the operating mode of the high-voltage direct-hung energy storage system to a low-voltage simulation mode, and control the grounding switch in the high-voltage direct-hung energy storage system to close to form a circuit loop for discharging the DC capacitor; After the high-voltage direct-mounted energy storage system successfully enters standby mode, the closing state signal of the AC bypass contactor is short-circuited, and the AC bypass contactor is disconnected.

2. The startup test method according to claim 1, wherein: The circuit loop for charging the DC capacitor includes: a high-voltage power grid, an AC soft-start resistor, and a DC capacitor. Charging the DC capacitor in the power unit to power the power unit includes: The second high-voltage AC circuit breaker is controlled to be closed, so that the high-voltage grid charges the DC capacitor in an uncontrolled rectification manner through the AC soft-start resistor.

3. The startup test method according to claim 2, wherein: The power unit also includes: a DC / DC power supply module, When the DC capacitor voltage is stable and the DC / DC power supply module is powered by the DC capacitor, the DC / DC power supply module drives and supplies power to the power unit.

4. The startup test method according to claim 3, wherein: After the DC / DC power supply module is powered on and before the SVG operation mode is started, the method further includes: Controlling the first DC contactor and the second DC contactor in the power unit to complete a logic test of a DC soft start circuit; The AC bypass contactor controlling the AC soft-start resistor in the high-voltage direct-mounted energy storage system is closed to complete standby mode.

5. The startup test method according to claim 1, wherein: Before changing the operating mode of the high-voltage direct-mounted energy storage system to the low-voltage simulation mode, the method further includes: The first high-voltage AC circuit breaker and the second high-voltage AC circuit breaker in the high-voltage direct-mounted energy storage system are controlled to be opened, and the AC bypass contactor and the second DC contactor in the power unit are controlled to be disconnected, so that the voltage of the DC capacitor drops after being discharged through the grading resistor.

6. The startup test method according to claim 5, wherein: The startup test method further includes: After the high-voltage direct-mounted energy storage system enters the low-voltage simulated operation state, the DC capacitor is discharged through the AC soft-start resistor in the power unit.

7. A high-voltage direct-mounted energy storage system, characterized in that: The system comprises: a startup module configured to charge the DC capacitor in the power unit according to a first preset method to energize the power unit when the high-voltage direct-mounted energy storage system enters the SVG operation mode, and then start the SVG operation mode; an exit module, configured to discharge the DC capacitor in a low-voltage simulation mode according to a second preset method when the high-voltage direct-mounted energy storage system exits the SVG operation mode, wherein different circuit loops are used when charging the DC capacitor and when discharging the DC capacitor; Startup module, also used to: Disconnecting the isolating switch in the power unit chain to disconnect the power unit and the energy storage battery unit, and short-circuiting the DC soft start circuit in the power unit; Controlling the closing of a first high-voltage AC circuit breaker in the high-voltage direct-hook energy storage system and detecting a high-voltage grid access signal in the high-voltage direct-hook energy storage system; The circuit loop when the DC capacitor is discharging includes: a DC capacitor, an AC soft-start resistor, and a ground terminal. Exit module, also used to: Controlling the high-voltage direct-mounted energy storage system to enter a standby state, and then controlling the high-voltage direct-mounted energy storage system to shut down; Modify the operating mode of the high-voltage direct-hung energy storage system to a low-voltage simulation mode, and control the grounding switch in the high-voltage direct-hung energy storage system to close to form a circuit loop for discharging the DC capacitor; After the high-voltage direct-mounted energy storage system successfully enters standby mode, the closing state signal of the AC bypass contactor is short-circuited, and the AC bypass contactor is disconnected.

8. An electronic device, characterized in that: The electronic device comprises: a processor; and a memory arranged to store computer-executable instructions, wherein when the executable instructions are executed, the processor is caused to perform the startup test method according to any one of claims 1 to 6.

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