Converter charging control method, device and system, storage medium and program product

Abstract

The invention discloses a converter charging control method, device and system, a storage medium and a program product, and relates to the technical field of power electronic control, and the disclosed converter charging control method comprises the steps: in a controllable charging stage, for each phase of converter unit in a converter, obtaining a current DC voltage average value of a current charging power module in the converter unit; comparing the current charging power module with a preset lower limit value and a preset upper limit value to obtain a comparison result; adjusting the number of the current charging power modules in the current conversion unit according to the comparison result; and returning to execute the step of acquiring the current DC voltage average value of the current charging power module in the converter unit until the current DC voltage average value is greater than or equal to the preset lower limit value and less than or equal to the preset upper limit value, thereby realizing converter charging control. According to the invention, automatic charging control of the current converter is realized, and the starting safety of the current converter is improved.

Description

Technical Field

[0001] The present application relates to the field of power electronic control technology, and in particular to a converter charging control method, device, system, storage medium and program product. Background Art

[0002] In new power systems based on renewable energy, before starting the converter, it is usually necessary to increase the capacitor voltage of each power module in the converter to near the reference voltage, and then unlock and start the converter to reduce the impact current when the converter is unlocked, thereby reducing safety issues.

[0003] Therefore, how to realize automatic charging control of the inverter and improve the safety of inverter startup needs to be solved urgently. Summary of the invention

[0004] The main purpose of this application is to provide a converter charging control method, device, system, storage medium and program product, aiming to solve the technical problem of how to realize automatic charging control of the converter and improve the safety of converter startup.

[0005] To achieve the above objectives, the present application proposes a converter charging control method, which includes:

[0006] In the controllable charging stage, for each phase commutation unit in the converter, the current DC voltage average value of the current charging power module in the commutation unit is obtained, wherein the current charging power module is a power module that is in a charging state at the current moment;

[0007] Compare the current charging power module with the preset lower limit value and the preset upper limit value to obtain a comparison result;

[0008] According to the comparison result, the number of current charging power modules in the commutation unit is adjusted;

[0009] Return to the step of obtaining the current average DC voltage of the current charging power module in the converter unit until the current average DC voltage is greater than or equal to the preset lower limit value and less than or equal to the preset upper limit value, thereby realizing converter charging control.

[0010] In one embodiment, the step of adjusting the number of current charging power modules according to the comparison result includes:

[0011] If the current DC voltage average value is less than the preset lower limit value, the first selected power module with the highest DC voltage among the current charging power modules is controlled to enter a bypass state;

[0012] If the current DC voltage average value is greater than the preset upper limit value, the second selected power module with the lowest DC voltage among the bypassed power modules is controlled to enter the charging state, wherein the bypassed power module is the power module that is currently in the bypassed state.

[0013] In one embodiment, the step of controlling a first selected power module having the highest DC voltage among the current charging power modules to enter a bypass state includes:

[0014] Within a first preset time period after the current moment, controlling a first selected power module with the highest DC voltage among the current charging power modules to enter a bypass state;

[0015] The step of controlling a second selected power module having the lowest DC voltage among the bypassed power modules to enter a charging state comprises:

[0016] Within a second preset time period after the current moment, a second selected power module with the lowest DC voltage among the bypassed power modules is controlled to enter a charging state.

[0017] In one embodiment, the first preset time length is greater than or equal to the second preset time length.

[0018] In one embodiment, the preset lower limit value and the preset upper limit value are determined according to the charging steady-state voltage value of the converter.

[0019] In one embodiment, in the controllable charging stage, before the step of obtaining the current average value of the current DC voltage of the current charging power module in the converter unit for each phase converter unit in the converter, the converter charging control method further includes:

[0020] Control the inverter to enter the uncontrollable charging stage;

[0021] When the average DC voltage of each power module in the converter meets the preset charging condition, the converter is controlled to enter the controllable charging stage.

[0022] In addition, to achieve the above-mentioned purpose, the present application also proposes a converter charging control device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the computer program is configured to implement the steps of the converter charging control method as described above.

[0023] In addition, to achieve the above purpose, the present application also proposes a converter charging control system, the converter charging control system comprising:

[0024] Inverter;

[0025] As the inverter charging control device mentioned above.

[0026] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by the processor, the steps of the inverter charging control method as described above are implemented.

[0027] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the converter charging control method as described above are implemented.

[0028] One or more technical solutions proposed in this application have at least the following technical effects:

[0029] The present application provides a converter charging control method, device, system, storage medium and program product. After the converter enters the controllable charging stage, the number of power modules entering the charging state is cyclically adjusted according to the average DC voltage of the current charging power module in the charging state to control the average DC voltage of each power module in each phase converter unit to gradually increase to within the charging steady-state voltage range corresponding to a preset lower limit value and a preset upper limit value, thereby realizing automatic converter charging control, solving the technical problem of how to realize automatic converter charging control and improve the startup safety of the converter, and improving the startup safety of the converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a partial structural diagram of the converter charging control system of this application;

[0033] Figure 2 This is a flow chart of the first embodiment of the converter charging control method of the present application;

[0034] Figure 3 This is a flow chart of the second embodiment of the converter charging control method of the present application;

[0035] Figure 4 Schematic diagram of the device structure of the hardware operating environment involved in the converter charging control method in the embodiment of the present application.

[0036] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0038] It should be noted that in this application, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a device or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a device or system. In the absence of more restrictions, an element defined by the sentence "includes..." does not exclude the existence of other identical elements in the device or system including the element.

[0039] In the present application, the suffixes such as "module", "component" or "unit" used to represent elements are used only to facilitate the description of the present application and have no specific meaning in themselves. Therefore, "module", "component" or "unit" can be used in a mixed manner. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, the technical solutions of the various embodiments can be combined with each other, but they must be based on the ability of those of ordinary skill in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0040] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0041] The main solution of the embodiment of the present application is: in the controllable charging stage, for each phase converter unit in the converter, the current DC voltage average value of the current charging power module in the converter unit is obtained, wherein the current charging power module is a power module that is in a charging state at the current moment; the current charging power module is compared with a preset lower limit value and a preset upper limit value to obtain a comparison result; according to the comparison result, the number of current charging power modules in the converter unit is adjusted; and the step of obtaining the current DC voltage average value of the current charging power module in the converter unit is returned to execute until the current DC voltage average value is greater than or equal to the preset lower limit value and less than or equal to the preset upper limit value, thereby realizing converter charging control.

[0042] In new power systems based on renewable energy, before starting the converter, it is usually necessary to increase the capacitor voltage of each power module in the converter to near the reference voltage, and then unlock and start the converter to reduce the impact current when the converter is unlocked, thereby reducing safety issues.

[0043] In the related technology, during the controllable charging stage of the converter, the number of power modules that need to be soft-bypassed can be calculated manually based on the effective value of the grid-side voltage and the reference value of the module DC voltage, and each power module in the converter can be controlled to perform soft-bypass operation; after the DC voltage of each power module reaches the vicinity of the reference value, a voltage stabilization operation is performed; during the voltage stabilization operation, the number of power modules that need to be put in and removed is calculated manually based on the allowable deviation value of the module DC voltage, thereby realizing converter charging control. It can be seen that the related converter charging control method requires frequent manual calculations, which is time-consuming and labor-intensive, resulting in low converter charging efficiency.

[0044] Therefore, the present application provides a solution. After the converter enters the controllable charging stage, the number of power modules entering the charging state is cyclically adjusted according to the average DC voltage of the current charging power module in the charging state, so as to control the average DC voltage of each power module in each phase converter unit to gradually increase to the charging steady-state voltage range corresponding to the preset lower limit value and the preset upper limit value, thereby realizing automatic converter charging control, solving the technical problem of how to realize automatic converter charging control and improve the start-up safety of the converter, and improving the start-up safety of the converter. Moreover, in the process of converter charging control, there is no need for frequent manual calculations, which saves the voltage stabilization time in the converter charging process and improves the charging efficiency of the converter.

[0045] First, an embodiment of the present application provides a converter charging control system, which may include:

[0046] Inverter;

[0047] Such as the inverter charging control device below.

[0048] It should be noted that if Figure 1 As shown, the converter charging control system is connected to the AC power grid. The converter charging control system can be a new power system or a part of a new power system. The number of converters in the converter charging control system can be one or more. The converter charging control device ( Figure 1 The power converter (not shown) may be a controller such as an MCU (Microcontroller Unit), a PLC (Programmable Automation Controller), or the like. The converter charging control device may control the charging of each converter in the converter charging control system according to the converter charging control method described below.

[0049] Based on this, the embodiment of the present application provides a converter charging control method, referring to Figure 2 , Figure 2 This is a flow chart of the first embodiment of the converter charging control method of the present application.

[0050] In this embodiment, the converter charging control method may include steps S100 to S400:

[0051] Step S100, in the controllable charging stage, for each phase converter unit in the converter, the current average value of the current charging power module in the converter unit is obtained.

[0052] The current charging power module is a power module that is currently in a charging state.

[0053] It should be noted that the converter may include a three-phase converter unit, and one phase converter unit may include one bridge arm, or may include two upper and lower bridge arms, and one bridge arm may include multiple power modules. The converter charging control device may control each phase converter unit to charge separately. Among them, the power module may be a full-bridge power module and / or a half-bridge power module.

[0054] It can be understood that before step S100, after the converter is controlled to enter the controllable charging stage, for each converter unit, the converter charging control device can control each power module in the converter unit to be put into the charging state in sequence according to the order of input. In the process of each power module being put into the charging state in sequence, step S100 is executed to obtain the current DC voltage average value of the current charging power module in the charging state. That is, after the converter charging control device controls the converter to enter the controllable charging stage, for a converter unit, the converter charging control device first controls part of the power modules of the converter unit to be put into the charging state according to the order of input, and then completes the charging control of the converter according to the converter charging control method of the embodiment of the present application. Among them, the power modules that are not put into the charging state are in the bypass state, and the order of input can be determined according to the position of each power module in the converter unit.

[0055] In a specific implementation, in the controllable charging stage, for each phase converter unit in the converter, the converter charging control device can obtain the current DC voltage average value of the current charging power module in the converter unit in real time. Among them, the number of current charging power modules can be one or more. When the number of current charging power modules is one, the current DC voltage average value is the DC voltage value of the current charging power module. When the number of current charging power modules is multiple, the current DC voltage average value is the average value of the DC voltage values ​​of multiple current charging power modules.

[0056] Step S200, comparing the current charging power module with a preset lower limit value and a preset upper limit value to obtain a comparison result.

[0057] Step S300: adjusting the number of current charging power modules in the commutation unit according to the comparison result.

[0058] Step S400, returning to step S100, until all power modules in the converter unit are in a charging state, the current DC voltage average value is greater than or equal to the preset lower limit value, and less than or equal to the preset upper limit value, to achieve converter charging control.

[0059] It should be noted that, for each converter unit in the converter, when the current DC voltage average value at the current moment is less than the preset lower limit or greater than the preset upper limit, the converter charging control device can control the current DC voltage average value to approach the range defined by the preset lower limit and the preset upper limit by putting in or removing the power module that has entered the charging state, so as to cyclically adjust the number of current charging power modules in the converter unit, until the current DC voltage average value is within the range defined by the preset lower limit and the preset upper limit, indicating that the converter charging has reached a stable state, and the converter charging control is realized. Among them, the power module put in or removed during one cycle can be one or more power modules, and preferably, one power module is put in or removed during one cycle.

[0060] In this embodiment, the preset lower limit value and the preset upper limit value are determined according to the charging steady-state voltage value of the converter.

[0061] It is understandable that the preset lower limit value and the preset upper limit value can be determined based on engineering experience or charging simulation. Preferably, the preset lower limit value and the preset upper limit value are determined based on the charging steady-state voltage value of the converter. The charging steady-state voltage value is the target DC voltage value of each power module after the converter is fully charged.

[0062] In a specific implementation, the preset lower limit value may be the difference between the charging steady-state voltage value and the preset voltage value, and the preset lower limit value may be the sum of the charging steady-state voltage value and the preset voltage value. The magnitude of the preset voltage value may be determined according to the magnitude of the charging steady-state voltage value of the actual converter.

[0063] In a feasible implementation, step S300 may include steps A310 to A320:

[0064] Step A310: If the current DC voltage average value is less than the preset lower limit value, the first selected power module with the highest DC voltage among the current charging power modules is controlled to enter a bypass state.

[0065] Step A320: If the current DC voltage average value is greater than the preset upper limit value, the second selected power module with the lowest DC voltage among the bypassed power modules is controlled to enter a charging state.

[0066] The bypassed power module is a power module that is currently in a bypassed state.

[0067] It should be noted that when the current DC voltage average value at the current moment is less than the preset lower limit value, a first selected power module in the charging state can be controlled to enter the bypass state, reducing the number of power modules in the charging state, thereby increasing the current DC voltage average value at the next moment, wherein the first selected power module can be any power module in the charging state, or it can be a power module determined from the current charging power modules in the charging state according to actual needs.

[0068] When the current DC voltage average value at the current moment is greater than the preset upper limit value, a second selected power module in the bypass state can be controlled to enter the charging state, and the number of power modules in the charging state can be increased, thereby reducing the current DC voltage average value at the next moment, wherein the second selected power module can be any power module in the bypass state, or it can be a power module determined from the bypassed power modules in the bypass state according to actual needs.

[0069] It can be understood that by cutting off the first selected power module with the highest DC voltage, not only the number of power modules in the charging state is reduced, but also the first selected power module can be prevented from being continuously charged and the DC voltage being too high. By putting in the second selected power module with the lowest DC voltage, not only the number of power modules in the charging state is increased, but also the second selected power module can be prevented from being continuously low.

[0070] In a feasible implementation, step A310 may include: within a first preset time period after the current moment, controlling a first selected power module with the highest DC voltage among the current charging power modules to enter a bypass state.

[0071] Step A320 may include: within a second preset time period after the current moment, controlling a second selected power module having the lowest DC voltage among the bypassed power modules to enter a charging state.

[0072] It should be noted that, in order to ensure charging safety during the charging process of the converter, the input time and the removal time of the power module can be set, and when the power module is input or removed, it is ensured that the input operation or removal operation of the power module is completed within the corresponding time. Among them, the first preset time is the input time, and the second preset time is the removal time. The first preset time and the second preset time can be determined according to the actual charging time of the converter.

[0073] In this embodiment, the first preset time length is greater than or equal to the second preset time length.

[0074] It should be noted that during the charging process of the inverter, the operation of putting the power module into operation has higher safety requirements than the operation of removing the power module. Therefore, the first preset time length can be set to be greater than or equal to the second preset time length to ensure charging safety.

[0075] In a feasible implementation, before step S100, the converter charging control method may further include: controlling the converter to enter an uncontrollable charging stage; when the average DC voltage of each power module in the converter meets a preset charging condition, controlling the converter to enter a controllable charging stage.

[0076] It should be noted that the converter charging process may include an uncontrollable charging stage and a controllable charging stage, such as Figure 1 As shown, by controlling the circuit breaker QF1 to be closed, the converter can be controlled to enter the uncontrollable charging stage. When the average DC voltage of each power module in the converter reaches the bypass threshold of the soft-start resistor R, the average DC voltage meets the preset charging condition, and the circuit breaker QF2 is controlled to be closed, the converter can be controlled to enter the controllable charging stage.

[0077] In one example, if Figure 1 and Figure 3 As shown, the complete process of the converter charging control method of this embodiment is to close QF1, and when the average DC voltage of each power module in the converter reaches the bypass threshold of the soft-start resistor R, close QF2, and control the converter to complete charging according to the converter charging control method of this embodiment. When the average DC voltage of each power module in the converter reaches the charging steady-state voltage value, the converter reaches the unlocking condition and enters the unlocking state. When the unlocking receives the receiving instruction, the converter is unlocked.

[0078] Therefore, this embodiment provides a converter charging control method. After the converter enters the controllable charging stage, the number of power modules entering the charging state is cyclically adjusted according to the average DC voltage of the current charging power module in the charging state to control the average DC voltage of each power module in each phase converter unit to gradually increase to the charging steady-state voltage range corresponding to the preset lower limit value and the preset upper limit value, thereby realizing automatic converter charging control, solving the technical problem of how to realize automatic converter charging control and improve the startup safety of the converter, and improving the startup safety of the converter.

[0079] The present application provides an inverter charging control device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the inverter charging control method in the above-mentioned embodiment one.

[0080] Reference below Figure 4 , which shows a schematic diagram of the structure of the converter charging control device suitable for implementing the embodiment of the present application. The converter charging control device in the embodiment of the present application may include but is not limited to mobile terminals such as controllers, notebook computers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions: tablet computers), etc., and fixed terminals such as desktop computers, etc. Figure 4 The inverter charging control device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0081] like Figure 4 As shown, the inverter charging control device may include a processing device 1001 (such as a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the inverter charging control device are also stored. The processing device 1001, ROM1002 and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 may allow the inverter charging control device to communicate with other devices wirelessly or by wire to exchange data. Although the figure shows an inverter charging control device with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems may be implemented or have alternatively.

[0082] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0083] The converter charging control device provided by the present application adopts the converter charging control method in the above embodiment, which can solve the technical problem of how to realize automatic charging control of the converter and improve the safety of converter startup. Compared with the related art, the beneficial effects of the converter charging control device provided by the present application are the same as the beneficial effects of the converter charging control method provided by the above embodiment, and the other technical features in the converter charging control device are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0084] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0085] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0086] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the inverter charging control method in the above-mentioned embodiment.

[0087] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0088] The computer-readable storage medium may be included in the inverter charging control device; or may exist independently without being assembled into the inverter charging control device.

[0089] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the converter charging control device, the converter charging control device: in the controllable charging stage, for each phase converter unit in the converter, obtain the current DC voltage average value of the current charging power module in the converter unit, wherein the current charging power module is a power module that is in a charging state at the current moment; compare the current charging power module with a preset lower limit value and a preset upper limit value to obtain a comparison result; according to the comparison result, adjust the number of current charging power modules in the converter unit; return to execute the step of obtaining the current DC voltage average value of the current charging power module in the converter unit until the current DC voltage average value is greater than or equal to the preset lower limit value and less than or equal to the preset upper limit value, thereby realizing converter charging control.

[0090] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0091] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0092] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0093] The readable storage medium provided in this application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned converter charging control method, and can solve the technical problem of how to realize automatic converter charging control and improve the startup safety of the converter. Compared with the related art, the beneficial effects of the computer-readable storage medium provided in this application are the same as the beneficial effects of the converter charging control method provided in the above-mentioned embodiment, and will not be repeated here.

[0094] The present application also provides a computer program product, including a computer program, which implements the steps of the above-mentioned converter charging control method when executed by a processor.

[0095] The computer program product provided in this application can solve the technical problem of how to realize automatic charging control of the converter and improve the safety of converter startup. Compared with the related art, the beneficial effects of the computer program product provided in this application are the same as the beneficial effects of the converter charging control method provided in the above embodiment, which will not be repeated here.

[0096] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A method for controlling charging of a converter, characterized in that: The converter charging control method comprises: In the controllable charging stage, for each phase commutation unit in the converter, the current DC voltage average value of the current charging power module in the commutation unit is obtained, wherein the current charging power module is a power module that is in a charging state at the current moment; Comparing the current charging power module with a preset lower limit value and a preset upper limit value to obtain a comparison result; According to the comparison result, adjusting the number of the current charging power modules in the commutation unit; Return to the step of obtaining the current average DC voltage of the current charging power module in the converter unit until the current average DC voltage is greater than or equal to the preset lower limit value and less than or equal to the preset upper limit value, so as to realize converter charging control.

2. The inverter charging control method according to claim 1, characterized in that: The step of adjusting the number of the current charging power modules according to the comparison result includes: If the current DC voltage average value is less than the preset lower limit value, controlling the first selected power module with the highest DC voltage among the current charging power modules to enter a bypass state; If the current DC voltage average value is greater than the preset upper limit value, the second selected power module with the lowest DC voltage among the bypassed power modules is controlled to enter the charging state, wherein the bypassed power module is the power module that is currently in the bypassed state.

3. The inverter charging control method according to claim 2, characterized in that: The step of controlling the first selected power module with the highest DC voltage among the current charging power modules to enter a bypass state comprises: Within a first preset time period after the current moment, controlling a first selected power module with the highest DC voltage among the current charging power modules to enter a bypass state; The step of controlling the second selected power module with the lowest DC voltage among the bypassed power modules to enter the charging state comprises: Within a second preset time period after the current moment, a second selected power module with the lowest DC voltage among the bypassed power modules is controlled to enter the charging state.

4. The inverter charging control method according to claim 3, characterized in that: The first preset time length is greater than or equal to the second preset time length.

5. The inverter charging control method according to any one of claims 1 to 4, characterized in that: The preset lower limit value and the preset upper limit value are determined according to a charging steady-state voltage value of the converter.

6. The inverter charging control method according to any one of claims 1 to 4, characterized in that: Before the step of obtaining the current average value of the current DC voltage of the current charging power module in each phase converter unit in the converter unit in the controllable charging stage, the converter charging control method further includes: Controlling the converter to enter an uncontrollable charging stage; When the average DC voltage of each power module in the converter meets the preset charging condition, the converter is controlled to enter the controllable charging stage.

7. An inverter charging control device, characterized in that: The converter charging control device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, the steps of the converter charging control method according to any one of claims 1 to 6 are implemented.

8. An inverter charging control system, characterized in that: The converter charging control system comprises: Inverter; The inverter charging control device as claimed in claim 7.

9. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the converter charging control method according to any one of claims 1 to 6 are implemented.

10. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the converter charging control method according to any one of claims 1 to 6 are implemented.

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