A pre-charge control circuit, control method and storage medium of an inverter

Abstract

The present application discloses a pre-charge control circuit, control method and storage medium of an inverter. The pre-charge control circuit is connected between the energy storage battery and the inverter load, and includes: a capacitor on the DC side of the inverter, a main positive switch tube, a main negative switch tube, a pre-charge resistor, a pre-charge switch tube, and a battery management system BMS. The pre-charge control method includes: based on the voltage difference between the input voltage of the DC side capacitor 8 of the inverter detected in real time and the total voltage of the energy storage battery, controlling the opening and closing of the main positive switch tube, the main negative switch tube, and the pre-charge switch tube to perform pre-charging of the DC side capacitor of the inverter. The present application can control the output current of the energy storage battery within a reasonable range at the moment when the energy storage battery is powered on, so as to avoid damage to the electronic / electrical components of the battery or the next-level load or triggering system failure due to excessive impact current when the energy storage battery is powered on.

Description

Technical Field

[0001] The present application relates to the field of pre-charging technology, and in particular to a pre-charging control circuit, a control method and a storage medium of an inverter. Background Art

[0002] Battery energy storage devices refer to devices used to store electrical energy so that it can be released when needed. Battery energy storage devices play an important role in modern energy systems, promoting the flexibility and sustainable development of energy systems.

[0003] When using a battery energy storage device, it is usually used together with an energy storage inverter. During the discharge process of the energy storage battery, in order to control the size and stability of the current and protect the components in the battery energy storage device, the energy storage inverter needs to be pre-charged. The pre-charging circuit controls the voltage rise rate by limiting the flow of current, protecting the safe operation of the battery and the power system. When the voltage at the input end of the energy storage inverter gradually reaches the predetermined working voltage, the function of the pre-charging circuit ends. The existing pre-charging circuit is usually composed of a relay and a pre-charging resistor. This pre-charging circuit has the following problems: first, the cost is high; second, the driving power of the relay is high; third, the completion of the existing pre-charging circuit is usually completed according to the time set by the software. Once the pre-charging time is reached, the BMS will determine that the pre-charging circuit is completed, but it cannot determine whether the power-on impact current has been effectively reduced. Summary of the invention

[0004] In response to the above problems, the purpose of the present application is to provide a pre-charging control circuit, control method and storage medium for an inverter, which can control the battery output current within a reasonable range at the moment the battery is powered on, thereby avoiding damage to the battery or the electronic / electrical components of the next-level load or triggering system failure due to excessive battery power-on impact current.

[0005] According to one aspect of the present application, a pre-charge control circuit of an inverter is provided, which is connected between an energy storage battery and an inverter load, and includes:

[0006] The inverter DC side capacitor is connected in parallel to the inverter load and is used to smooth the DC power provided by the energy storage battery to ensure that the inverter load provides a stable operating voltage at its output end;

[0007] Main positive switch: connected in series between the positive electrode of the energy storage battery and the positive input terminal of the DC side capacitor of the inverter to form a positive circuit, used to control the opening and closing of the positive circuit;

[0008] Main negative switch: connected in series between the negative electrode of the energy storage battery and the negative electrode input terminal of the inverter DC side capacitor to form a negative electrode circuit, used to control the opening and closing of the negative electrode circuit;

[0009] Pre-charging resistor: connected in series with the pre-charging switch tube between the negative electrode of the energy storage battery and the negative electrode input terminal of the inverter DC side capacitor, or connected in series with the pre-charging switch tube between the positive electrode of the energy storage battery and the positive electrode input terminal of the inverter DC side capacitor to form a pre-charging circuit for limiting the current size of the pre-charging circuit;

[0010] Pre-charging switch tube: used to control the opening and closing of the pre-charging circuit;

[0011] Battery management system BMS: connected to the main positive switch tube gate, the main negative switch tube gate, and the pre-charge switch tube gate, and used to control the opening and closing of the main positive switch tube, the main negative switch tube, and the pre-charge switch tube based on the real-time detected pressure difference between the input voltage of the inverter DC side capacitor and the total voltage of the energy storage battery, so as to perform pre-charging of the inverter DC side capacitor;

[0012] The main positive switch tube, the main negative switch tube and the pre-charge switch tube are MOS tubes or insulated gate bipolar transistors;

[0013] The initial states of the main positive switch tube, the main negative switch tube and the pre-charge switch tube are off states.

[0014] The battery management system BMS is further configured as follows:

[0015] Before discharging the energy storage battery, performing a fault check on the pre-charge control circuit;

[0016] The fault check includes sending a test signal to verify the response of the pre-charge control circuit; monitoring the pre-charge resistance and the status of the main positive switch tube, the main negative switch tube, and the pre-charge switch tube; checking the voltage and grounding of the energy storage battery; reading and verifying sensor data, and executing the self-diagnosis software of the battery management system BMS.

[0017] Preferably, in some embodiments of the present application, the battery management system BMS is further configured as follows:

[0018] When the voltage difference between the input voltage of the inverter DC side capacitor and the total voltage of the energy storage battery is greater than 5% of the total voltage of the energy storage battery, it is determined that pre-charging is performed, the pre-charging switch tube and the main positive switch tube are controlled to be turned on, and the main negative switch tube is controlled to be turned off, so as to perform pre-charging of the inverter DC side capacitor;

[0019] When the voltage difference between the input voltage of the inverter DC side capacitor and the total voltage of the energy storage battery is less than or equal to 5% of the total voltage of the energy storage battery, the pre-charging is judged to be completed, the pre-charging switch tube is controlled to be turned off, and the main positive switch tube and the main negative switch tube are controlled to be turned on, and the pre-charging of the inverter DC side capacitor is stopped.

[0020] Preferably, in some embodiments of the present application, the battery management system BMS is further configured as follows:

[0021] According to the formula The pre-charging resistance is adjusted, and the current of the pre-charging circuit is controlled according to the pre-charging resistance, wherein: is the current of the pre-charge circuit, is the voltage of the energy storage battery, is the initial voltage of the inverter DC side capacitor, is the resistance of the pre-charge resistor, are other resistors inside the pre-charge control circuit.

[0022] According to another aspect of the present application, the present application further provides a pre-charging control method for an inverter, using a pre-charging control circuit as provided in any one of the above embodiments, including:

[0023] Based on the real-time detected voltage difference between the input voltage of the inverter DC side capacitor and the total voltage of the energy storage battery, the main positive switch tube, the main negative switch tube, and the pre-charge switch tube are controlled to be turned on and off to perform pre-charging of the inverter DC side capacitor;

[0024] When the voltage difference between the input voltage of the inverter DC side capacitor and the total voltage of the energy storage battery is greater than 5% of the total voltage of the energy storage battery, the battery management system BMS controls the pre-charging switch tube and the main positive switch tube to turn on, and controls the main negative switch tube to turn off, so as to perform pre-charging of the inverter DC side capacitor;

[0025] When the voltage difference between the input voltage of the inverter DC side capacitor and the total voltage of the energy storage battery is less than or equal to 5% of the total voltage of the energy storage battery, the battery management system BMS determines that the pre-charging is completed, controls the pre-charging switch tube to turn off, controls the main positive switch tube and the main negative switch tube to turn on, and stops pre-charging the inverter DC side capacitor.

[0026] According to another aspect of the present application, the present application further provides a computer-readable storage medium on which computer instructions are stored. When the computer instructions are executed by a processor, the pre-charging control method provided by any one of the above embodiments can be implemented.

[0027] It should be understood that within the scope of this application, the above-mentioned technical features of this application and the technical features specifically described below (such as embodiments) can be combined with each other to form a new or preferred technical solution. Due to space limitations, they will not be described one by one here.

[0028] Compared with the prior art, this application has the following technical effects:

[0029] The present application can control the battery output current within a reasonable range at the moment the battery is powered on, thereby avoiding damage to the battery or the electronic / electrical components of the next-level load or triggering system failure due to excessive battery power-on surge current. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

[0031] Figure 1 A schematic diagram of a pre-charge control circuit of an inverter according to an embodiment of the present application is shown.

[0032] Figure numerals: 1 energy storage battery; 2 battery management system BMS; 3 main positive switch tube; 4 pre-charge resistor; 5 pre-charge switch tube; 6 main negative switch tube; 7 inverter load; 8 inverter DC side capacitor. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution, beneficial effects and significant progress of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, all the described embodiments are only partial embodiments of the present application, not all embodiments; based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] The present application is further described below in conjunction with specific implementations. It should be understood that these embodiments are only used to illustrate the present application and are not used to limit the scope of the present application.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The phrase appearing in various locations in the specification does not necessarily refer to the same embodiment, nor is it limited to mutually exclusive independent or alternative embodiments. Those skilled in the art should be able to understand that the embodiments herein may be combined with other embodiments without causing structural conflicts.

[0036] In the description of this article, unless otherwise clearly specified and limited, the technical terms "installed", "connected", "connected" and the like should be understood in a broad sense, and can be a movable connection, a fixed connection or an integral connection, or a connection through a certain connector. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0037] In the description of this document, terms indicating orientation or positional relationships, such as "up", "down", "left", "right", "horizontal", "vertical", "height", "length", and "width", are intended to accurately describe the embodiments and simplify the description, but are not intended to limit the parts or structures involved to have a specific orientation, be installed or operate in a specific orientation, and should not be construed as a limitation on the embodiments in this document.

[0038] In the description of this article, the terms "first", "second" and the like are only used to distinguish different objects, and cannot be understood as indicating relative importance or limiting the quantity, specific order or primary and secondary relationship of the described technical features. In the description of this article, the meaning of "plurality" is at least two.

[0039] Embodiments of the present application will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present application, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings to represent the same or similar parts.

[0040] Figure 1 FIG. 1 is a schematic diagram showing a pre-charge control circuit of an inverter according to an embodiment of the present application. Figure 1 As shown, a pre-charge control circuit of an inverter of the present application is connected between an energy storage battery 1 and an inverter load 7, and includes:

[0041] The inverter DC side capacitor 8 is connected in parallel to the inverter load 7 and is used to smooth the DC power provided by the energy storage battery 1 to ensure that the inverter provides a stable operating voltage at its output end;

[0042] Main positive switch 3: connected in series between the positive electrode of the energy storage battery 1 and the positive input terminal of the inverter DC side capacitor 8 to form a positive circuit, used to control the opening and closing of the positive circuit;

[0043] Main negative switch 6: connected in series between the negative electrode of the energy storage battery 1 and the negative electrode input terminal of the inverter DC side capacitor 8 to form a negative electrode circuit, used to control the opening and closing of the negative electrode circuit;

[0044] Pre-charging resistor 4: connected in series with the pre-charging switch tube 5 between the negative electrode of the energy storage battery 1 and the negative electrode input terminal of the inverter DC side capacitor 8, or connected in series with the pre-charging switch tube 5 between the positive electrode of the energy storage battery 1 and the positive electrode input terminal of the inverter DC side capacitor 8, to form a pre-charging circuit for limiting the current size of the pre-charging circuit;

[0045] Pre-charge switch tube 5: used to control the opening and closing of the pre-charge circuit;

[0046] Battery management system BMS2: connected to the gate of the main positive switch tube 3, the gate of the main negative switch tube 6, and the gate of the pre-charging switch tube 5, and used to control the opening and closing of the main positive switch tube 3, the main negative switch tube 6, and the pre-charging switch tube 5 based on the voltage difference between the input voltage of the inverter DC side capacitor 8 and the total voltage of the energy storage battery 1 detected in real time, so as to perform pre-charging of the inverter DC side capacitor 8.

[0047] Preferably, in some embodiments of the present application, the main positive switch tube 3, the main negative switch tube 6 and the pre-charge switch tube 5 are MOS tubes or insulated gate bipolar transistors.

[0048] Preferably, in some embodiments of the present application, the initial state of the main positive switch tube 3, the main negative switch tube 6 and the pre-charge switch tube 5 is the off state.

[0049] Preferably, in some embodiments of the present application, the battery management system BMS2 is further configured as follows:

[0050] Before discharging the energy storage battery 1, a fault check is performed on the pre-charge control circuit;

[0051] The fault check includes sending a test signal to verify the response of the pre-charge control circuit; monitoring the status of the pre-charge resistor 4 and the main positive switch tube 3, the main negative switch tube 6, and the pre-charge switch tube 5; checking the voltage and grounding condition of the energy storage battery 1; reading and verifying the sensor data, and executing the self-diagnosis software of the battery management system BMS2.

[0052] Furthermore, in some embodiments of the present application, sensors are provided in the pre-charging circuit to monitor key parameters, such as voltage, current or temperature. The role of the sensor in the pre-charging circuit is to ensure that the pre-charging process is safe and reliable and to avoid damage to the circuit or equipment. The battery management system BMS2 can read and verify the sensor data.

[0053] Preferably, in some embodiments of the present application, the battery management system BMS2 is further configured as follows:

[0054] When the voltage difference between the input voltage of the inverter DC side capacitor 8 and the total voltage of the energy storage battery 1 is greater than 5% of the total voltage of the energy storage battery 1, it is determined that pre-charging is performed, the pre-charging switch tube 5 and the main positive switch tube 3 are controlled to be turned on, and the main negative switch tube 6 is controlled to be turned off, and the inverter DC side capacitor 8 is pre-charged.

[0055] When the voltage difference between the input voltage of the inverter DC side capacitor 8 and the total voltage of the energy storage battery is less than or equal to 5% of the total voltage of the energy storage battery 1, the pre-charging is judged to be completed, the pre-charging switch tube 5 is controlled to be turned off, the main positive switch tube 3 and the main negative switch tube 6 are controlled to be turned on, and the pre-charging of the inverter DC side capacitor 8 is stopped.

[0056] Specifically, when the pre-charging process reaches a certain stage, that is, the voltage difference between the input voltage of the inverter DC side capacitor 8 and the total voltage of the energy storage battery is less than or equal to 5% of the total voltage of the energy storage battery 1, the battery management system BMS2 will make a judgment and stop pre-charging the inverter DC side capacitor 8. At this time, the battery management system BMS2 will control the pre-charging switch tube 5 to turn off, and control the main positive switch tube 3 and the main negative switch tube 6 to turn on, thereby stopping the pre-charging of the inverter DC side capacitor 8 and allowing the battery system to enter a normal working state.

[0057] Furthermore, Table 1 shows the experimental data of the voltage relationship between the energy storage battery voltage and the impact current under different pre-charge voltages. It can be seen from Table 1 that directly powering on the energy storage battery may cause a sharp increase in instantaneous impact current, which in turn may cause damage to the electrical components inside the battery (such as contactors, fuses, capacitors, etc.). Through the pre-charging process, the voltage across the capacitor side of the inverter DC side, i.e., the pre-charging voltage, is gradually established, which can effectively limit this impact current and protect the battery components from damage. Through experiments, it is found that when the input voltage of the inverter DC side capacitor 8 approaches and reaches 95% of the total voltage of the energy storage battery, the voltage of the impact current is less than or equal to 20V, and the battery system is in a safe state. Therefore, the voltage difference of 5% is set as a safety threshold in this application to trigger the pre-charging process.

[0058] Table 1 Experimental data of the relationship between the voltage of the energy storage battery and the voltage of the impact current at different pre-charge voltages:

[0059]

[0060] Therefore, in order to limit the power-on impact current and ensure the stable operation of the system, the present application adopts a pre-charging circuit. The core design of this circuit is to avoid damage to the system caused by excessive impact by reasonably controlling the initial charging current.

[0061] Preferably, in some embodiments of the present application, the battery management system BMS2 is further configured as follows:

[0062] According to the formula Adjust the resistance of the pre-charge resistor, and control the current of the pre-charge circuit according to the resistance of the pre-charge resistor. is the current of the pre-charge circuit, is the voltage of the energy storage battery, is the initial voltage of the inverter DC side capacitor, is the resistance of the pre-charge resistor, To pre-charge other resistors inside the control circuit.

[0063] Specifically, during the pre-charging process, the magnitude of the surge current can be adjusted by adjusting the pre-charging resistor. To precisely control, the specific relationship is given by the following formula:

[0064] ;

[0065] in, is the current during pre-charging, is the battery voltage, is the load voltage (in the pre-charging stage, it can be regarded as the initial voltage of the inverter DC side capacitor), is the pre-charge resistor, It is other resistance inside the system (such as line resistance, switch tube on resistance, etc.). This application selects the appropriate The value can ensure that the impact current is limited to the range that the system can withstand, thereby protecting the inverter, battery and other related components.

[0066] According to another aspect of the present application, the present application further provides a pre-charging control method for an inverter, using a pre-charging control circuit as provided in any one of the above embodiments, including:

[0067] Based on the real-time detected voltage difference between the input voltage of the inverter DC side capacitor 8 and the total voltage of the energy storage battery 1, the main positive switch tube 3, the main negative switch tube 6, and the pre-charge switch tube 5 are controlled to be turned on and off to perform pre-charging of the inverter DC side capacitor 8.

[0068] Preferably, in some embodiments of the present application, when the voltage difference between the input voltage of the inverter DC side capacitor 8 and the total voltage of the energy storage battery 1 is greater than 5%, the battery management system BMS2 controls the pre-charging switch tube 5 and the main positive switch tube 3 to turn on, and controls the main negative switch tube 6 to turn off, to perform pre-charging of the inverter DC side capacitor 8.

[0069] Preferably, in some embodiments of the present application, when the voltage difference between the input voltage of the inverter DC side capacitor 8 and the total voltage of the energy storage battery 1 is less than or equal to 5%, the battery management system BMS2 determines that the pre-charging is completed, controls the pre-charging switch tube 5 to turn off, controls the main positive switch tube 3 and the main negative switch tube 6 to turn on, and stops pre-charging the inverter DC side capacitor 8.

[0070] According to another aspect of the present application, the present application further provides a computer-readable storage medium on which computer instructions are stored. When the computer instructions are executed by a processor, the pre-charging control method provided by any one of the above embodiments can be implemented.

[0071] The present application discloses a pre-charge control circuit, control method and storage medium of an inverter. Before the energy storage battery is discharged, the battery management system BMS first performs a self-check. If there is no fault, the battery management system BMS will first open the pre-charge switch tube. Under the limitation of the pre-charge resistance, the energy storage battery charges the inverter DC side capacitor with a small current. As the charging time increases, the voltage on the inverter DC side capacitor gradually increases. When the battery management system BMS detects that the voltage difference between the voltage at the output port of the energy storage battery and the total voltage of the energy storage battery is less than or equal to 5%, the battery management system BMS will determine that the pre-charge is completed, thereby controlling the pre-charge switch tube to be disconnected. In this way, the pre-charge circuit is disconnected, and then the main positive switch tube 3 and the main negative switch tube 6 on the positive and negative circuits of the battery are closed. Since the voltage at the output port of the energy storage battery is greater than 95% of the total voltage of the energy storage battery, under a 5% voltage difference, even if there is a power-on impact current, the impact current will be greatly reduced, thereby effectively avoiding the problem of too large an impact current at the moment of discharge of the energy storage battery, thereby effectively avoiding system failures caused by excessive impact currents and damage to electrical components inside the battery.

[0072] The above describes the preferred embodiments of the present application. It should be understood that the present application is not limited to the above-mentioned specific implementation modes, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present application without departing from the scope of the technical solutions of the present application, or modify them into equivalent embodiments of equivalent changes, which does not affect the substantive content of the present application. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solutions of the present application are still within the scope of protection of the technical solutions of the present application.

Claims

1. A precharge control circuit for an inverter, characterized in that: The pre-charge control circuit is connected between the energy storage battery and the inverter load, and includes: The inverter DC side capacitor is connected in parallel to the inverter load and is used to smooth the DC power provided by the energy storage battery to ensure that the inverter load provides a stable operating voltage at its output end; Main positive switch: connected in series between the positive electrode of the energy storage battery and the positive input terminal of the DC side capacitor of the inverter to form a positive circuit, used to control the opening and closing of the positive circuit; Main negative switch: connected in series between the negative electrode of the energy storage battery and the negative electrode input terminal of the inverter DC side capacitor to form a negative electrode circuit, used to control the opening and closing of the negative electrode circuit; Pre-charging resistor: connected in series with the pre-charging switch tube between the negative electrode of the energy storage battery and the negative electrode input terminal of the inverter DC side capacitor, or connected in series with the pre-charging switch tube between the positive electrode of the energy storage battery and the positive electrode input terminal of the inverter DC side capacitor to form a pre-charging circuit for limiting the current size of the pre-charging circuit; Pre-charging switch tube: used to control the opening and closing of the pre-charging circuit; Battery management system BMS: connected to the main positive switch tube gate, the main negative switch tube gate, and the pre-charge switch tube gate, and used to control the opening and closing of the main positive switch tube, the main negative switch tube, and the pre-charge switch tube based on the real-time detected pressure difference between the input voltage of the inverter DC side capacitor and the total voltage of the energy storage battery, so as to perform pre-charging of the inverter DC side capacitor; The main positive switch tube, the main negative switch tube and the pre-charge switch tube are MOS tubes or insulated gate bipolar transistors; The initial state of the main positive switch tube, the main negative switch tube and the pre-charge switch tube is the off state; The battery management system BMS is further configured as follows: Before discharging the energy storage battery, performing a fault check on the pre-charge control circuit; The fault check includes sending a test signal to verify the response of the pre-charge control circuit; monitoring the pre-charge resistance and the status of the main positive switch tube, the main negative switch tube, and the pre-charge switch tube; checking the voltage and grounding of the energy storage battery; reading and verifying sensor data, and executing the self-diagnosis software of the battery management system BMS; The battery management system BMS is further configured as follows: When the voltage difference between the input voltage of the inverter DC side capacitor and the total voltage of the energy storage battery is greater than 5% of the total voltage of the energy storage battery, it is determined that pre-charging is performed, the pre-charging switch tube and the main positive switch tube are controlled to be turned on, and the main negative switch tube is controlled to be turned off, so as to perform pre-charging of the inverter DC side capacitor; When the voltage difference between the input voltage of the inverter DC side capacitor and the total voltage of the energy storage battery is less than or equal to 5% of the total voltage of the energy storage battery, the pre-charging is judged to be completed, the pre-charging switch tube is controlled to be turned off, and the main positive switch tube and the main negative switch tube are controlled to be turned on, and the pre-charging of the inverter DC side capacitor is stopped.

2. The precharge control circuit according to claim 1, characterized in that: The battery management system BMS is further configured as follows: According to the formula Adjust the pre-charging resistance, and control the current of the pre-charging circuit according to the pre-charging resistance, wherein I pre is the current of the pre-charge circuit, V bat is the voltage of the energy storage battery, V load is the initial voltage of the inverter DC side capacitor, R pre is the resistance of the pre-charge resistor, R sys are other resistors inside the pre-charge control circuit.

3. A pre-charging control method for an inverter, characterized in that: The precharge control circuit according to any one of claims 1 to 2 comprises: Based on the real-time detected voltage difference between the input voltage of the inverter DC side capacitor and the total voltage of the energy storage battery, the main positive switch tube, the main negative switch tube, and the pre-charge switch tube are controlled to be turned on and off to perform pre-charging of the inverter DC side capacitor; When the voltage difference between the input voltage of the inverter DC side capacitor and the total voltage of the energy storage battery is greater than 5% of the total voltage of the energy storage battery, the battery management system BMS controls the pre-charging switch tube and the main positive switch tube to turn on, and controls the main negative switch tube to turn off, so as to perform pre-charging of the inverter DC side capacitor; When the voltage difference between the input voltage of the inverter DC side capacitor and the total voltage of the energy storage battery is less than or equal to 5% of the total voltage of the energy storage battery, the battery management system BMS determines that the pre-charging is completed, controls the pre-charging switch tube to turn off, controls the main positive switch tube and the main negative switch tube to turn on, and stops pre-charging the inverter DC side capacitor.

4. A computer-readable storage medium having computer instructions stored thereon, characterized in that: When the computer instructions are executed by a processor, the pre-charging control method as claimed in claim 3 is implemented.

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