Energy storage converter charging circuit control method and device, charging circuit, storage medium, program product and energy storage converter

Abstract

The invention provides an energy storage converter charging circuit control method and device, a charging circuit, a storage medium, a program product and an energy storage converter. The energy storage converter charging circuit control method comprises the following steps: in response to a control instruction of an energy storage converter controller, a unit control circuit generates a first relay closing instruction and controls a first relay to be converted into a closed state from an open circuit state; in response to a first trigger condition of the relay, the unit control circuit generates a second relay closing instruction and controls the second relay to be converted into a closed state from an open circuit state; and in response to a second trigger condition of the relay, the unit control circuit generates a first relay disconnection instruction and controls the first relay to be converted into an open circuit state from a closed state. According to an exemplary embodiment, a locking function of closing control of a charging contactor and a main contactor of the energy storage converter is realized through arrangement of a detection circuit and execution control, and the safety of the energy storage converter is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of energy storage systems, and in particular to a method and device for controlling a charging circuit of an energy storage converter, a charging circuit, a storage medium, a program product, and an energy storage converter. Background Art

[0002] The energy storage converter is the core component of the electrochemical energy storage system. It converts the AC power of the power grid into DC power and stores it in the energy storage battery, or converts the DC power of the energy storage battery into AC power and feeds it back to the power grid or directly supplies it to the power-consuming equipment. The energy storage converter is divided into voltage source type energy storage converter and current source type energy storage converter. The energy storage converter usually refers to the voltage source type energy storage converter.

[0003] The DC input end of the energy storage converter has a parallel capacitor for voltage stabilization and filtering. The internal resistance of the parallel capacitor at the DC input end of the energy storage converter is very small. Without current limiting measures, directly closing the DC end contactor of the energy storage converter to connect the energy storage battery and the parallel capacitor at the DC input end of the energy storage converter will cause a short-circuit-like problem at the initial moment when the energy storage battery charges the parallel capacitor at the DC input end of the energy storage converter, generating a very large capacitor charging surge current. This surge current will cause damage to the overcurrent protection device at the DC input end of the energy storage converter, overcurrent shock or damage to the DC end contactor of the energy storage converter, and damage to the health of the energy storage battery.

[0004] It should be noted that the statements herein merely provide background information related to the present disclosure and do not necessarily constitute prior art. Summary of the invention

[0005] In view of the above problems, a method, device, charging circuit, storage medium, program product and energy storage converter for controlling a charging circuit of an energy storage converter are proposed to overcome the above problems or at least partially solve the above problems.

[0006] The embodiments of the present disclosure adopt the following technical solutions:

[0007] In a first aspect, a method for controlling a charging circuit of an energy storage converter is provided, the method comprising: in response to a control instruction of an energy storage converter controller, a unit control circuit generates a first relay closing instruction, and controls the first relay to change from an open circuit state to a closed state, wherein the unit control circuit is connected to the energy storage converter controller; in response to a first trigger condition of the relay, the unit control circuit generates a second relay closing instruction, and controls the second relay to change from an open circuit state to a closed state. In response to a second trigger condition of the relay, the unit control circuit generates a first relay disconnection instruction, and controls the first relay to change from a closed state to an open circuit state.

[0008] In a second aspect, a control device for a charging circuit of an energy storage converter is provided, characterized in that it includes: a first unit, in response to a control instruction of an energy storage converter controller, the unit control circuit generates a first relay closing instruction, and controls the first relay to change from an open circuit state to a closed state; a second unit, in response to a first trigger condition of the relay, the unit control circuit generates a second relay closing instruction, and controls the second relay to change from an open circuit state to a closed state. A third unit, in response to a second trigger condition of the relay, the unit control circuit generates a first relay disconnection instruction, and controls the first relay to change from a closed state to an open circuit state.

[0009] In a third aspect, a charging circuit for an energy storage inverter is provided, characterized in that it includes: a detection circuit, which generates different level status information according to different states of a normally open contact; a contactor, which is connected to the detection circuit and is used to trigger a state transition of the normally open contact; a relay, one end of which is connected to the contactor; a control circuit, the controlled circuit being respectively connected to the detection circuit and the other end of the relay; a processor; and a memory arranged to store computer executable instructions, which, when executed, causes the processor to execute any method as described in the first aspect.

[0010] According to a fourth aspect, a computer storage medium is provided on which instructions are stored, wherein when the instructions are executed individually or collectively by at least one processor of a computing device, the computing device is caused to execute any method as described in the first aspect.

[0011] According to a fifth aspect, a computer program product is provided, comprising instructions, wherein when the instructions are executed individually or collectively by at least one processor of a computing device, the computing device is caused to execute any method as described in the first aspect.

[0012] In a sixth aspect, a chip is provided, characterized in that the chip includes a circuit system, and the circuit system is configured to execute any method as described in the first aspect.

[0013] At least one of the above technical solutions adopted by the exemplary embodiment can achieve the following beneficial effects:

[0014] An exemplary embodiment of the present disclosure monitors the working state of the contactor by setting a detection circuit and related execution conditions, and realizes the locking function of the closing control of the DC-side charging contactor and the main contactor of the energy storage converter by monitoring the state change of the circuit.

[0015] It should be understood that the invention summary is not intended to identify the key or essential features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of some embodiments of the present disclosure in the accompanying drawings, in which:

[0017] Figure 1 It is a schematic flow chart of a method for controlling a charging circuit of an energy storage converter in an embodiment of the present disclosure;

[0018] Figure 2 It is a schematic diagram of a DC end charging circuit of an energy storage converter in an embodiment of the present disclosure;

[0019] Figure 3 This is a control schematic diagram of the DC end charging circuit of the energy storage converter in the embodiment of the present disclosure;

[0020] Figure 4 It is a schematic diagram of a charging circuit control device of an energy storage converter in an embodiment of the present disclosure;

[0021] Figure 5 Schematic diagram of the structure of the energy storage converter in the embodiment of the present disclosure. DETAILED DESCRIPTION

[0022] The principle of the present disclosure will now be described with reference to some embodiments. It should be understood that the description of these embodiments is only for illustrative purposes, and helps those skilled in the art to understand and implement the present disclosure, without any limitation to the scope of the present disclosure. The disclosure described herein can be implemented in a manner different from that described below.

[0023] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0024] References in this disclosure to "one embodiment," "an embodiment," "an exemplary embodiment," etc. indicate that the described embodiment may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes the particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment. In addition, when a particular feature, structure, or characteristic is described in conjunction with an exemplary embodiment, whether or not explicitly described, those skilled in the art will recognize that such feature, structure, or characteristic affects incorporation into other embodiments.

[0025] It should be understood that although the terms "first" and "second" etc. may be used to describe various elements herein, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, without departing from the scope of the exemplary embodiments, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. The term "and / or" as used herein includes any and all combinations of one or more of the listed terms.

[0026] The terms used herein are only for describing specific embodiments, rather than for limiting exemplary embodiments. The singular forms "one", "an", and "the" used herein also include plural forms, unless the context clearly indicates otherwise. "A group of elements" or "element set" used herein is intended to include one or more elements. It should also be understood that the terms "include", "comprise", "have", "have", "include" and / or "include", when used herein, specify the presence of the features, elements and / or parts, etc., but do not exclude the presence or addition of one or more other features, elements, parts and / or combinations thereof.

[0027] As used in this disclosure, the term "circuitry" may refer to one or more or all of the following:

[0028] (a) Hardware circuit implementation only (e.g., implementation only in analog and / or digital circuits)

[0029] (b) a combination of hardware circuitry and software, such as (where applicable):

[0030] (i) a combination of analog and / or digital hardware circuits and software / firmware; and

[0031] (ii) any portion of a hardware processor (including a digital signal processor) with software, software and memory that work together to enable a device such as a mobile phone or server to perform various functions, and

[0032] (c) A hardware circuit and / or processor, such as a microprocessor or portion of a microprocessor, that requires software (e.g., firmware) to operate, but where software is not required for operation, the software may not be present.

[0033] This definition of circuitry applies to all uses of this term in this disclosure, including in any claims. As another example, as used in this disclosure, the term circuitry also includes merely a hardware circuit or processor (or multiple processors) or a portion of a hardware circuit or processor and its (or their) accompanying software and / or firmware implementation. The term circuitry also includes, for example, if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device, or a similar integrated circuit in a server, cellular network device, or other computing network device.

[0034] In an exemplary embodiment, in view of the current situation in the related art that contactor misoperation may occur during the operation of the DC-end capacitor of the energy storage inverter, a highly universal energy storage inverter charging circuit control method is designed. This method reduces mis-triggering operations during the operation of the energy storage inverter by setting a detection circuit and a locking scheme for the charging circuit.

[0035] The technical solutions provided by various embodiments of the present disclosure are described in detail below in conjunction with the accompanying drawings.

[0036] The disclosed embodiments provide a method, device, charging circuit, storage medium, program product and energy storage converter for controlling a charging circuit of an energy storage converter. Figure 1 As shown, a schematic flow chart of a method 100 for controlling a charging circuit of an energy storage converter in an embodiment of the present disclosure is provided. The method 100 for controlling a charging circuit of an energy storage converter at least includes the following steps S110 to S130.

[0037] Step S110, in response to a control instruction of the energy storage converter controller, the unit control circuit generates a first relay closing instruction and controls the first relay to change from an open state to a closed state, wherein the unit control circuit is connected to the energy storage converter controller.

[0038] like Figure 2 The schematic diagram of the DC end charging circuit of the energy storage converter is shown. The DC end charging contactor KM1 of the energy storage converter is closed, and the energy storage battery charges the DC end parallel capacitor C1 of the energy storage converter through the charging current limiting circuit; after the DC end parallel capacitor C1 of the energy storage converter is charged to a voltage close to the energy storage battery voltage, the second DC end contactor KM2 of the energy storage converter is closed, bypassing the DC end charging contactor KM1 and the current limiting resistor R1, and connecting the energy storage battery and the DC end parallel capacitor C1 of the energy storage converter. In the process of the energy storage converter controlling the energy storage battery to charge the DC end parallel capacitor, the contactor KM1 may be mistakenly closed, so it is necessary to set a contactor closing lockout control scheme.

[0039] like Figure 3As shown, when the energy storage converter is working, the DC circuit breaker QF1 at the output end of the energy storage battery is closed. The energy storage converter controller of the energy storage converter sends a closing command to the first contactor KM1 at the DC end of the energy storage converter. After receiving the closing command to the first contactor KM1 at the DC end of the energy storage converter, the unit control circuit arranged on the unit control board controls the relay KA1 to close. The normally open contacts of the relay KA1 are closed, so that the control coil of the first contactor KM1 at the DC end of the energy storage converter is energized. After the normally open main contacts of the first contactor KM1 at the DC end of the energy storage converter are closed, the energy storage battery charges the parallel capacitor C1 at the DC end of the energy storage converter through the current limiting resistor R1. It should be noted that the normally open contacts include normally open main contacts and normally open auxiliary contacts, and the two operate synchronously.

[0040] Step S120, in response to the first trigger condition of the relay, the unit control circuit generates a second relay closing instruction, and controls the second relay to change from an open state to a closed state.

[0041] The first trigger condition includes: the first detection circuit of the unit control circuit maintains a low level for a first preset time period, and the voltage of the parallel capacitor exceeds a preset threshold; the unit control circuit generates a second relay closing instruction, and controls the second relay to change from an open state to a closed state, including: in response to the closed state of the second relay, the normally open contact of the second contactor changes from an open state to a closed state; in response to the closed state of the normally open contact of the second contactor, the second detection circuit of the unit control circuit changes from a high level to a low level.

[0042] like Figure 3 As shown, when the normally open main contact of the first contactor KM1 at the DC end of the energy storage converter is not closed, the output state of the closing detection circuit (first detection circuit) of the first contactor KM1 at the DC end of the unit control circuit is high level, and the closing permission lock signal of the second contactor KM2 at the DC end of the unit control circuit remains invalid; that is, when the normally open main contact of the first contactor KM1 is not closed, the second contactor KM2 is prohibited from closing. When the normally open main contact of the first contactor KM1 at the DC end of the energy storage converter is closed, its normally open auxiliary contact is also closed, and the output state of the closing detection circuit (first detection circuit) of the first contactor KM1 at the DC end of the unit control circuit is converted from high level to low level.

[0043] After the second contactor KM2 of the DC end of the unit control circuit is closed, the output state of the closing detection circuit of the first contactor KM1 is converted from a high level to a low level, and the timing is started. In one example, within a preset time period, such as 5 seconds, the closing of the second contactor KM2 at the DC end allows the locking signal to remain in an invalid state. That is, the operation of the second contactor KM2 is invalid within 5 seconds when the first detection circuit is at a low level. After the closing of the second contactor KM2 at the DC end is 5 seconds, the relevant operation instructions of the second contactor KM2 at the DC end will be conditionally executed.

[0044] The energy storage converter controller of the energy storage converter detects the terminal voltage of the parallel capacitor C1 at the DC end of the energy storage converter. When the terminal voltage of the parallel capacitor C1 reaches a threshold value allowing the closing of the second contactor KM2 at the DC end of the energy storage converter, the energy storage converter controller of the energy storage converter issues a closing command for the second contactor KM2 at the DC end of the energy storage converter.

[0045] It can be understood that when the lockout time threshold and the capacitor voltage threshold conditions are met at the same time, the instruction of the energy storage converter controller to the second contactor KM2 is effective.

[0046] Step S130, in response to the second triggering condition of the relay, the unit control circuit generates a first relay disconnection instruction, and controls the first relay to change from a closed state to an open state.

[0047] like Figure 3 As shown, after the unit control circuit receives the closing command of the second contactor KM2 at the DC end of the energy storage converter, if the closing permission locking signal of the second contactor KM2 at the DC end is valid, the control relay KA2 is closed, the normally open contact of the relay KA2 is closed, the control coil of the second contactor KM2 at the DC end of the energy storage converter is energized, the normally open main contact of the second contactor KM2 at the DC end of the energy storage converter is closed, the first contactor KM1 at the DC end of the energy storage converter and the current limiting resistor R1 are bypassed, and the energy storage battery ends the charging process of the parallel capacitor C1 at the DC end of the energy storage converter through the current limiting circuit.

[0048] The unit control circuit detects the closing state of the second contactor KM2 at the DC end of the energy storage converter and uploads it to the energy storage converter controller of the energy storage converter. It should be noted that when the normally open main contact of the second contactor KM2 at the DC end of the energy storage converter is closed, its normally open auxiliary contact is also closed, and the output state of the closing detection circuit (second detection circuit) of the second contactor KM2 at the DC end of the unit control circuit is converted from a high level to a low level, and the unit control board uploads the high level output state of the closing detection circuit of the second contactor KM2 at the DC end to the energy storage converter controller of the energy storage converter.

[0049] After the energy storage inverter detects the closing state of the second contactor KM2 at the DC end of the energy storage inverter, it sends an opening command for the first contactor KM1 at the DC end of the energy storage inverter after a fixed delay. After the unit control circuit receives the opening command for the first contactor KM1 at the DC end of the energy storage inverter, the unit control board controls the relay KA1 to open, the normally open contacts of the relay KA1 are separated, the control coil of the first contactor KM1 at the DC end of the energy storage inverter loses power, and the normally open main contacts of the first contactor KM1 at the DC end of the energy storage inverter are separated.

[0050] It should be understood that monitoring the state of the contactor through the detection circuit can reduce erroneous operations caused by abnormal interaction instructions; by setting the closing and opening conditions of the contactor (locking control), the operation timing of the contactor can be comprehensively judged to improve the operating stability of the energy storage inverter.

[0051] The embodiment of the present disclosure also provides a charging circuit control device 400 for an energy storage converter, such as Figure 4 As shown, the charging circuit control device 400 at least includes: a first unit 410, a second unit 420, and a third unit 430, wherein:

[0052] The first unit 410 is specifically used for: in response to a control instruction of the energy storage converter controller, the unit control circuit generates a first relay closing instruction, and controls the first relay to change from an open state to a closed state.

[0053] The second unit 420 is specifically configured to: in response to a first trigger condition of the relay, the unit control circuit generates a second relay closing instruction, and controls the second relay to change from an open state to a closed state.

[0054] The third unit 430 is specifically used for: in response to the second trigger condition of the relay, the unit control circuit generates a first relay disconnection instruction, and controls the first relay to change from a closed state to an open state.

[0055] The above-mentioned charging circuit control device can implement each step of the charging circuit control method provided in the above-mentioned embodiment. The relevant explanations about the charging circuit control method are applicable to the charging circuit control device and will not be repeated here.

[0056] Although specific functions are discussed above with reference to specific units, it should be noted that the functions of the various units discussed herein can be divided into multiple units, and / or at least some functions of multiple units can be combined into a single unit. The specific unit discussed herein performs an action including the specific unit itself performing the action, or alternatively the specific unit calls or otherwise accesses another component or unit that performs the action (or performs the action in conjunction with the specific unit). Therefore, the specific unit that performs an action can include the specific unit itself that performs the action and / or another unit that the specific unit calls or otherwise accesses and performs the action.

[0057] It should also be understood that various techniques may be described herein in the general context of software hardware elements or program units. Figure 4 The various units described may be implemented in hardware or in hardware in combination with software and / or firmware. For example, these units may be implemented as computer program code / instructions configured to be executed in one or more processors and stored in a computer-readable storage medium. Alternatively, these units may be implemented as hardware logic / circuits.

[0058] The embodiment of the present disclosure also provides a computer program product, including instructions, which, when executed individually or collectively by at least one processor of a computing device, enable the computing device to execute the above-mentioned charging circuit control method.

[0059] The embodiment of the present disclosure further provides a chip, the chip includes a circuit system, and the circuit system is configured to execute the above charging circuit control method. It should be noted that the circuit system can be a dedicated integrated circuit, a general-purpose processor, or a combination thereof.

[0060] An embodiment of the present disclosure also provides a charging circuit for an energy storage inverter, comprising: a detection circuit, the detection circuit generates different level status information according to different states of a normally open contact; a contactor, the contactor is connected to the detection circuit and is used to trigger a state transition of the normally open contact; a relay, one end of the relay is connected to the contactor; a control circuit, the controlled circuit is respectively connected to the detection circuit and the other end of the relay; a processor; and a memory arranged to store computer executable instructions, the executable instructions causing the processor to execute the method described above when executed.

[0061] The disclosed embodiment also provides an energy storage converter, including the energy storage converter charging circuit as described above.

[0062] Figure 5 This is a schematic diagram of the structure of an energy storage converter according to an embodiment of the present application. Figure 5At the hardware level, the energy storage converter includes a processor, and optionally also includes an internal bus, a network interface, and a memory. The memory may include a memory, such as a high-speed random access memory (RAM), and may also include a non-volatile memory (non-volatile memory), such as at least one disk storage. Of course, the energy storage converter may also include hardware required for other services.

[0063] The processor, network interface and memory can be interconnected through an internal bus, which can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0064] The memory is used to store the program. Specifically, the program may include a program code, and the program code includes a computer operation instruction. The memory may include a memory and a non-volatile memory, and provides instructions and data to the processor.

[0065] The processor reads the corresponding computer program from the non-volatile memory into the memory and then runs it, forming an energy storage inverter charging circuit control device at the logical level. The processor executes the program stored in the memory and is specifically used to perform the following operations:

[0066] In response to the control instruction of the energy storage converter controller, the unit control circuit generates a first relay closing instruction and controls the first relay to change from an open state to a closed state; in response to the first trigger condition of the relay, the unit control circuit generates a second relay closing instruction and controls the second relay to change from an open state to a closed state. In response to the second trigger condition of the relay, the unit control circuit generates a first relay disconnection instruction and controls the first relay to change from a closed state to an open state.

[0067] The above application Figure 1The method performed by the energy storage converter charging circuit control device disclosed in the illustrated embodiment can be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in the processor or instructions in software form. The above processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed by a hardware decoding processor, or executed by a combination of hardware and software modules in a decoding processor. The software module can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0068] The energy storage converter can also perform Figure 1 The method is implemented by the energy storage converter charging circuit control device, and the energy storage converter charging circuit control device is implemented in Figure 1 The functions of the illustrated embodiment will not be described in detail in the embodiments of the present application.

[0069] The embodiment of the present application also provides a computer-readable storage medium, which stores one or more programs, wherein the one or more programs include instructions, which, when executed by an energy storage converter including multiple application programs, enable the energy storage converter to execute Figure 1 The method performed by the energy storage converter charging circuit control device in the illustrated embodiment is specifically used to perform:

[0070] In response to the control instruction of the energy storage converter controller, the unit control circuit generates a first relay closing instruction and controls the first relay to change from an open state to a closed state; in response to the first trigger condition of the relay, the unit control circuit generates a second relay closing instruction and controls the second relay to change from an open state to a closed state. In response to the second trigger condition of the relay, the unit control circuit generates a first relay disconnection instruction and controls the first relay to change from a closed state to an open state.

[0071] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0072] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0073] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0074] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0075] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0076] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0077] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage media or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0078] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0079] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0080] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A method for controlling a charging circuit of an energy storage converter, characterized in that: The method comprises: In response to a control instruction of an energy storage converter controller, a unit control circuit generates a first relay closing instruction and controls the first relay to change from an open state to a closed state, wherein the unit control circuit is connected to the energy storage converter controller; In response to the first trigger condition of the relay, the unit control circuit generates a second relay closing instruction and controls the second relay to change from an open state to a closed state; In response to the second trigger condition of the relay, the unit control circuit generates a first relay disconnection instruction and controls the first relay to change from a closed state to an open state.

2. The method according to claim 1, characterized in that: The first trigger condition includes that the first detection circuit of the unit control circuit continues to be at a low level for a first preset time period, and the voltage of the parallel capacitor exceeds a preset threshold; The unit control circuit generates a second relay closing instruction and controls the second relay to change from an open state to a closed state, including: In response to the closed state of the second relay, the normally open contact of the second contactor changes from an open state to a closed state; In response to the closed state of the normally open contact of the second contactor, the second detection circuit of the unit control circuit changes from a high level to a low level.

3. The method according to claim 2, characterized in that: The second trigger condition includes that the second monitoring circuit continues in a low level state for a second preset time period; The unit control circuit generates a first relay disconnection instruction and controls the first relay to change from a closed state to an open state, including: In response to the open circuit state of the normally open contact of the first contactor, the first detection circuit of the unit control circuit changes from a low level to a high level.

4. The method according to any one of claims 1 to 3, characterized in that: In response to the control instruction of the energy storage converter controller, the unit control circuit generates a first relay closing instruction and controls the first relay to change from an open state to a closed state, including: In response to the closed state of the first relay, the normally open contact of the first contactor changes from an open state to a closed state; In response to the closed state of the normally open contact of the first contactor, the first detection circuit of the unit control circuit changes from a high level to a low level.

5. A charging circuit control device for an energy storage converter, characterized in that: include: A first unit, in response to a control instruction of an energy storage converter controller, a unit control circuit generates a first relay closing instruction and controls the first relay to change from an open state to a closed state, wherein the unit control circuit is connected to the energy storage converter controller; The second unit, in response to the first trigger condition of the relay, the unit control circuit generates a second relay closing instruction and controls the second relay to change from an open state to a closed state. The third unit, in response to the second trigger condition of the relay, the unit control circuit generates a first relay disconnection instruction and controls the first relay to change from a closed state to an open state.

6. An energy storage converter charging circuit, characterized in that: include: A detection circuit, wherein the detection circuit generates different level state information according to different states of the normally open contact; A contactor, connected to the detection circuit, for triggering a state transition of the normally open contact; A relay, one end of which is connected to the contactor; A control circuit, wherein the controlled circuit is respectively connected to the detection circuit and the other end of the relay; processor; as well as A memory arranged to store computer executable instructions, which when executed cause the processor to perform the method as claimed in any one of claims 1 to 4.

7. A computer storage medium storing instructions, characterized in that: When the instructions are executed individually or collectively by at least one processor of a computing device, the computing device is caused to perform the method according to any one of claims 1 to 4.

8. A computer program product comprising instructions, characterized in that When the instructions are executed individually or collectively by at least one processor of a computing device, the computing device is caused to perform the method according to any one of claims 1 to 4.

9. An energy storage converter, characterized in that: It comprises the energy storage converter charging circuit as claimed in claim 6.

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