Multi-module parallel control method and device, equipment and storage medium

Abstract

The invention discloses a multi-module parallel control method, device and equipment and a storage medium, and belongs to the technical field of variable-voltage variable-frequency power sources, the multi-module parallel control method is applied to a multi-module parallel system, and the multi-module parallel system comprises a plurality of power modules connected in parallel. The method comprises the following steps: determining a regulation and control type of the multi-module parallel system based on respective electric power parameters of a plurality of power modules; and determining a to-be-shut-down module in the plurality of power modules based on the regulation and control type, and controlling the to-be-shut-down module to stop running. The invention provides a multi-module parallel control strategy to improve the reliability of a multi-module parallel system.

Description

Technical Field

[0001] The present application belongs to the technical field of variable voltage and variable frequency power supply, and in particular, relates to a multi-module parallel control method, device, equipment and storage medium. Background Art

[0002] At present, the way to improve the power level of the system is mainly through modular design in the system, and then connecting multiple power modules in parallel to improve the power level of the system, wherein the power module refers to a three-phase controllable rectifier bridge and a DC capacitor and related filter units, sampling circuits, and drive circuits. The rectifier bridge can be a half bridge or a full bridge, and can be two-level or multi-level. A system containing multiple parallel power modules is called a multi-module parallel system. Specifically, for products of different power levels, the number of parallel power modules can be adjusted without increasing or decreasing the current capacity of the power modules, so that the overall capacity of the multi-module parallel system can be adjusted quickly. However, during the operation of multiple parallel power modules, a control method is adopted in which all power modules are started or stopped at the same time without distinction, that is, regardless of the load size, all power modules work at the same time, and when any module in the multiple parallel power modules fails, the multi-module parallel system is directly controlled to shut down, resulting in low reliability of the multi-module parallel system.

[0003] In summary, how to provide a multi-module parallel control strategy to improve the reliability of the multi-module parallel system has become a technical problem that needs to be urgently solved in the field of variable voltage and variable frequency power supply technology. Summary of the invention

[0004] The main purpose of this application is to provide a multi-module parallel control method, device, equipment and storage medium, and to provide a multi-module parallel control strategy to improve the reliability of the multi-module parallel system.

[0005] In order to achieve the above object, the present application provides a multi-module parallel control method, the multi-module parallel control method is applied to a multi-module parallel system, the multi-module parallel system includes a plurality of parallel power modules, and the multi-module parallel control method includes the following steps:

[0006] Determining the control type of the multi-module parallel system based on the power parameters of each of the plurality of power modules;

[0007] A module to be shut down among the plurality of power modules is determined based on the regulation type, and the module to be shut down is controlled to stop running.

[0008] Optionally, the step of determining the regulation type of the multi-module parallel system based on the power parameters of each of the plurality of power modules includes:

[0009] Calculating the total output power of the plurality of power modules based on the respective power parameters of the plurality of power modules;

[0010] Calculating a ratio between the total output power and the rated power of the multi-module parallel system;

[0011] When the ratio is less than a preset value, it is determined that the control type of the multi-module parallel system is active control.

[0012] Optionally, the step of determining a module to be shut down among the plurality of power modules based on the regulation type includes:

[0013] When the control type is active control, calculating the second number based on the first number of the plurality of power modules and the ratio;

[0014] The second number of power modules are arbitrarily selected from the plurality of power modules as modules to be shut down.

[0015] Optionally, after the step of controlling the module to be shut down to stop running, the method further includes:

[0016] In the case where the regulation type is active regulation, recording the target time when the module to be shut down stops running, and after a preset time of the target time, arbitrarily selecting a third number of power modules from the module to be shut down as the first power modules, wherein the sum of the third number and the second number is the first number;

[0017] The first power module is controlled to start running, the power modules except the first power module among the multiple power modules are updated to the modules to be shut down, and the step of controlling the modules to be shut down to stop running is returned to be executed.

[0018] Optionally, the step of determining the regulation type of the multi-module parallel system based on the power parameters of each of the plurality of power modules includes:

[0019] Detecting whether the power parameters of each of the power modules are within a preset parameter range;

[0020] If it is detected that the power parameter of at least one of the power modules is not within the preset parameter range, it is determined that the control type of the multi-module parallel system is passive control.

[0021] Optionally, the step of determining a module to be shut down among the plurality of power modules based on the regulation type includes:

[0022] When the control type is passive control, a second power module among the multiple power modules is determined as a module to be shut down, wherein the second power module is a power module among the multiple power modules whose power parameters are not within the preset parameter range.

[0023] Optionally, after the step of controlling the module to be shut down to stop running, the method further includes:

[0024] In the case where the regulation type is passive regulation, the average output power of each third power module is calculated based on the total output power of the plurality of power modules, wherein the third power module is a power module other than the module to be shut down among the plurality of power modules;

[0025] If the average output power is greater than the preset rated power, the multi-module parallel system is controlled to shut down.

[0026] In addition, to achieve the above-mentioned purpose, the present application also provides a frequency converter, the frequency converter comprising a plurality of power modules connected in parallel, the frequency converter comprising:

[0027] A type determination module, used to determine the control type of the multi-module parallel system based on the power parameters of each of the plurality of power modules;

[0028] A shutdown module is used to determine a module to be shut down among the multiple power modules based on the regulation type, and control the module to be shut down to stop running.

[0029] In addition, to achieve the above-mentioned purpose, the present application also provides a frequency converter, which includes: a memory, a processor, and a multi-module parallel control program stored in the memory and executable on the processor. When the multi-module parallel control program of the frequency converter is executed by the processor, the steps of the multi-module parallel control method as described above are implemented.

[0030] In addition, to achieve the above-mentioned purpose, the present application also provides a computer-readable storage medium, on which a multi-module parallel control program is stored, and when the multi-module parallel control program is executed by a processor, the steps of the multi-module parallel control method as described above are implemented.

[0031] The embodiment of the present application is applied to a multi-module parallel system. It can be understood that the multi-module parallel system is a system including multiple parallel power modules. Based on the power parameters of the multiple power modules during operation, the control type of the multi-module parallel system is determined, and then the modules to be shut down among the multiple power modules are determined based on the control type, and the modules to be shut down are controlled to stop running. In this way, compared with the traditional control method of indiscriminately starting or stopping all power modules at the same time, the embodiment of the present application determines the modules to be shut down among the power modules based on the control type of the multi-module parallel system, and only controls the modules to be shut down to stop running, retaining other power modules except the modules to be shut down, thereby ensuring the availability of the multi-module parallel system and improving the reliability of the multi-module parallel system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the device structure of the inverter hardware operating environment involved in the embodiment of the present application;

[0033] Figure 2 This is a schematic diagram of the steps of the first embodiment of the multi-module parallel control method of the present application;

[0034] Figure 3 A block diagram of a multi-module parallel system involved in an embodiment of a multi-module parallel control method of the present application;

[0035] Figure 4 This is a block diagram of the operation processing of multiple modules Nx involved in one embodiment of the multi-module parallel control method of the present application;

[0036] Figure 5 This is a schematic diagram of the active Nx operation processing flow involved in an embodiment of the multi-module parallel control method of the present application;

[0037] Figure 6 This is a schematic diagram of a passive Nx operation processing flow involved in an embodiment of the multi-module parallel control method of the present application;

[0038] Figure 7 This is a schematic diagram of the functional modules of an inverter according to an embodiment of the present application.

[0039] 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

[0040] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0041] Reference Figure 1 , Figure 1 This is a schematic diagram of the device structure of the hardware operating environment of the inverter involved in the embodiment of the present application.

[0042] It should be noted that the embodiments of the present application relate to a frequency converter integrated with a multi-module parallel system in the field of variable voltage and variable frequency power supply technology. Specifically, the multi-module parallel system includes a plurality of parallel power modules, and the multi-module parallel system may also include a control unit, which refers to a micro-computing and control unit such as an MCU (Microcontroller Unit), a DSP (Digital Signal Processing) or an FPGA (Field Programmable Gate Array) for realizing signal processing calculations and system control.

[0043] like Figure 1 As shown, the frequency converter may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (DiSplay), an input unit such as a keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a Wi-Fi interface). The memory 1005 may be a high-speed RAM memory, or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may optionally be a storage device independent of the aforementioned processor 1001. For ease of description below, the execution body of the method steps in each embodiment is omitted.

[0044] Those skilled in the art will understand that Figure 1 The inverter structure shown in the figure does not constitute a limitation on the inverter, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0045] like Figure 1 As shown, the memory 1005 as a computer storage medium may include an operating system, a network communication module, a user interface module, and a multi-module parallel control program.

[0046] exist Figure 1 In the terminal shown, the network interface 1004 is mainly used to connect to the backend server and perform data communication with the backend server; the user interface 1003 is mainly used to connect to the client and perform data communication with the client; and the processor 1001 can be used to call the multi-module parallel control program stored in the memory 1005 and perform the following operations:

[0047] Determining the control type of the multi-module parallel system based on the power parameters of each of the plurality of power modules;

[0048] A module to be shut down among the plurality of power modules is determined based on the regulation type, and the module to be shut down is controlled to stop running.

[0049] Further, the operation of determining the regulation type of the multi-module parallel system based on the power parameters of each of the plurality of power modules includes:

[0050] Calculating the total output power of the plurality of power modules based on the respective power parameters of the plurality of power modules;

[0051] Calculating a ratio between the total output power and the rated power of the multi-module parallel system;

[0052] When the ratio is less than a preset value, it is determined that the control type of the multi-module parallel system is active control.

[0053] Further, the operation of determining a module to be shut down among the plurality of power modules based on the regulation type includes:

[0054] When the control type is active control, calculating the second number based on the first number of the plurality of power modules and the ratio;

[0055] The second number of power modules are arbitrarily selected from the plurality of power modules as modules to be shut down.

[0056] Further, after the step of controlling the module to be shut down to stop running, the processor 1001 may also be used to call the multi-module parallel control program stored in the memory 1005 to perform the following operations:

[0057] In the case where the regulation type is active regulation, recording the target time when the module to be shut down stops running, and after a preset time of the target time, arbitrarily selecting a third number of power modules from the module to be shut down as the first power modules, wherein the sum of the third number and the second number is the first number;

[0058] The first power module is controlled to start running, the power modules except the first power module among the multiple power modules are updated to the modules to be shut down, and the step of controlling the modules to be shut down to stop running is returned to be executed.

[0059] Further, the operation of determining the regulation type of the multi-module parallel system based on the power parameters of each of the plurality of power modules includes:

[0060] Detecting whether the power parameters of each of the power modules are within a preset parameter range;

[0061] If it is detected that the power parameter of at least one of the power modules is not within the preset parameter range, it is determined that the control type of the multi-module parallel system is passive control.

[0062] Further, the operation of determining a module to be shut down among the plurality of power modules based on the regulation type includes:

[0063] When the control type is passive control, a second power module among the multiple power modules is determined as a module to be shut down, wherein the second power module is a power module among the multiple power modules whose power parameters are not within the preset parameter range.

[0064] Further, after the step of controlling the module to be shut down to stop running, the processor 1001 may also be used to call the multi-module parallel control program stored in the memory 1005 to perform the following operations:

[0065] In the case where the regulation type is passive regulation, the average output power of each third power module is calculated based on the total output power of the plurality of power modules, wherein the third power module is a power module other than the module to be shut down among the plurality of power modules;

[0066] If the average output power is greater than the preset rated power, the multi-module parallel system is controlled to shut down.

[0067] Based on the above structure, various embodiments of a multi-module parallel control method are proposed.

[0068] Please refer to Figure 2 , Figure 2 This is a flowchart of the first embodiment of the multi-module parallel control method of the present application. It should be noted that although the logical order is shown in the flowchart, in some cases, the multi-module parallel control method of the present application can of course also perform the steps shown or described in a different order from that here. In this embodiment, the execution subject of the multi-module parallel control method is a frequency converter, which is not limited in this embodiment. The multi-module parallel control method includes S10~S20:

[0069] Step S10: determining a control type of the multi-module parallel system based on respective power parameters of the plurality of power modules.

[0070] The multi-module parallel system includes a plurality of power modules connected in parallel. It should be understood that the multi-module parallel system provides energy supply and transmission, and can monitor, control and protect the multi-module parallel system. Through the control of the multi-module parallel system, each power module can work in coordination to keep the entire multi-module parallel system stable, safe and efficient. The module refers to a three-phase controlled rectifier bridge and a DC capacitor as well as related filter units, sampling circuits, and drive circuits. The rectifier bridge can be a half bridge or a full bridge, and can be two-level or multi-level. In this embodiment, the module has the same meaning as the power module. The power parameters include but are not limited to the input current, output current, input voltage, output voltage, output power and temperature characteristics of the power module, among which the output power is the active power, i.e., the actual output power. The control type of the multi-module parallel system includes active control (i.e., the system is lightly loaded) and / or passive control (i.e., power device failure), wherein the power device failure includes but is not limited to overcurrent failure, overtemperature failure, overvoltage failure, undervoltage failure and short circuit failure of the power module. When a power device failure occurs in a power module in the system, the control type of the multi-module parallel system is determined to be passive control.

[0071] Based on the power parameters of each of the multiple power modules connected in parallel in the multi-module parallel system, the control type of the multi-module parallel system is determined. This embodiment does not limit the way of obtaining the power parameters of each power module. For example, in a feasible implementation, the voltage, current, frequency, power and other parameters in the multi-module parallel system can be monitored in real time using dedicated sensors and measuring instruments. These sensors can be connected to the input and output terminals of the corresponding power modules to obtain key power parameters. For example, in another feasible implementation, the data obtained by the sensors are collected, recorded and analyzed through a data acquisition and monitoring system. These systems can monitor the power parameters of each power module in real time, and provide visualization and reporting of the changes of parameters such as current, voltage, power, frequency, etc. over time. In addition, this embodiment does not limit the specific implementation method of determining the control type based on each power parameter.

[0072] In one feasible implementation, the step S10 includes steps A10 to A30:

[0073] Step A10: calculating the total output power of the plurality of power modules based on the respective power parameters of the plurality of power modules.

[0074] The multi-module parallel system (also referred to as a multi-module parallel system) including multi-module parallel connection is characterized in that the DC side and the AC side are directly connected in parallel through a common bus, the number of parallel modules can be freely increased or decreased, and a single control unit is used for control. The DC side and the AC side are connected to the load and the power grid respectively, or the DC side and the AC side are connected to the DC power supply and the AC motor respectively. The multi-module parallel system can operate in a single quadrant or a four-quadrant. For example, Figure 3 The block diagram of the multi-module parallel system shown in the figure controls the operation of each module through a control unit, wherein each module can be respectively recorded as module 1...module N, N is greater than or equal to 2, indicating the total number of modules, and the AC side of the multi-module parallel system is connected to the AC power grid, and the DC side of the multi-module parallel system is connected to the load.

[0075] In a specific implementation, the control unit collects the AC voltage information Uabc and the AC current information Iabc_n of modules 1 to N (N≥2, an integer) in real time, and calculates the total system power P_total (i.e., the above-mentioned total output power) based on the voltage and current information, wherein the AC voltage information is the active component after decoupling the AC voltage, and the AC current information is also the active component after decoupling the AC current, so the total system power is the active power, i.e., the actual output power.

[0076] Step A20, calculating the ratio between the total output power and the rated power of the multi-module parallel system.

[0077] Get the rated power P_rate of the multi-module parallel system, and then calculate the ratio between the total output power P_total and the rated power P_rate. This ratio is recorded as c.

[0078] Step A30, when the ratio is less than a preset value, determining that the control type of the multi-module parallel system is a system light load.

[0079] A value is set in advance according to actual needs as a preset value, and it is determined whether the above ratio is less than the preset value. If the above ratio is less than the preset value, it is determined that the control type of the multi-module parallel system is active control.

[0080] In a specific implementation, the preset value is set to 0.5. When the ratio c between the total output power P_total and the rated power P_rate is less than 0.5, it means that the actual output power is less than half of the rated power. It can be determined that the system is lightly loaded, that is, the current system load is small. At this time, the control type of the multi-module parallel system is determined to be active control.

[0081] In another feasible implementation manner, the step S10 includes steps B10 to B20:

[0082] Step B10, detecting whether the power parameters of each of the power modules are within a preset parameter range;

[0083] Step B20: If it is detected that the power parameter of at least one of the power modules is not within the preset parameter range, determining that the control type of the multi-module parallel system is passive control.

[0084] A standard parameter range of power parameters is set in advance according to actual needs, that is, the above-mentioned preset parameter range, to detect whether the power parameters of each power module are within the preset parameter range. If it is detected that the power parameters of at least one power module among the power modules are not within the preset parameter range, it is determined that the control type of the multi-module parallel system is passive control.

[0085] In a specific implementation, the operation of the multi-module parallel system can be compared with the corresponding standards and specifications to ensure whether the power parameters of each power module meet the predetermined requirements. For example, it can be checked whether the power module voltage is within the specified range. If the voltage is not within the specified range, it is determined that the power module has an overvoltage fault or an undervoltage fault.

[0086] Step S20: determining a module to be shut down among the plurality of power modules based on the regulation type, and controlling the module to be shut down to stop running.

[0087] When the control type of the multi-module parallel system is system light load, the power modules defined as abnormal operation among the multiple power modules are determined as modules to be shut down. Specifically, when the system is determined to be light load, the number of power modules that need to be started and operated is determined based on the load demand, and other power modules that do not need to be operated are regarded as modules to be shut down. When the control type of the multi-module parallel system is power device failure, the power modules in which power device failure occurs among the multiple power modules are determined as modules to be shut down. After the modules to be shut down among the multiple power modules are determined based on the control type of the multi-module parallel system, the modules to be shut down are controlled to stop running.

[0088] In a feasible implementation, when the control type of the multi-module parallel system is system light load and power device failure, the power module in which the power device failure occurs among the multiple power modules can be first determined as the module to be shut down, and the module to be shut down can be shut down. Then, the power module that does not need to be operated can be determined from the remaining power modules as the module to be shut down, and the module to be shut down can be shut down.

[0089] It should be noted that, in this application, the method of "determining a module to be shut down from multiple power modules to shut down" is referred to as the Nx operation control method, where N is the total number of multiple power modules, and x is the number of modules to be shut down among the multiple power modules. Figure 4The figure shows a multi-module Nx operation processing block diagram, which obtains the AC voltage information Uabc and AC current information Iabc_n of each power module, obtains the operating power of each power module, and then enters the Nx processing module based on each operating power, and then controls the start and stop of each module through the module driver.

[0090] In this embodiment, after step A30, step A40 is further included:

[0091] In a feasible implementation manner, the step S20 includes steps S201 to S202:

[0092] Step S201: when the control type is active control, calculating a second quantity based on a first quantity of a plurality of the power modules and the ratio.

[0093] The number of power modules in parallel in the multi-module parallel system (hereinafter referred to as the first number for distinction) is counted, and the number is multiplied by the ratio between the total output power P_total and the rated power P_rate, and the result is recorded as the number of operating modules, wherein the number of operating modules refers to the number of power modules that must be operated to meet the load demand under the current load demand. The second number is obtained by subtracting the number of operating modules from the first number.

[0094] In a specific implementation, the calculation formula for the number of operating modules is: M=N*c, where M is an integer representing the number of operating modules, N is the total number of power modules, and c is the ratio between the total output power P_total and the rated power P_rate. The calculation formula for the second number is (NM).

[0095] Step S202: arbitrarily selecting the second number of power modules from the plurality of power modules as modules to be shut down.

[0096] When the control type of the multi-module parallel system is active control, any second number of power modules (hereinafter referred to as second power modules for distinction) are selected from the multiple power modules as modules to be shut down.

[0097] In a specific implementation, it is assumed that there are 10 power modules in operation in a multi-module parallel system, and the total output power of these 10 power modules is calculated. It is calculated that the total output power is exactly one-half of the rated power of the system, that is, c is 0.5, then the total number 10 is multiplied by c, and the number of operating modules is 5. Then, 5 power modules are randomly selected from the 10 power modules to keep running, and the remaining 5 power modules (modules to be shut down) are shut down to reduce the switching loss of the system.

[0098] In another feasible implementation, the step S20 includes step S203:

[0099] Step S203, when the regulation type is passive regulation, determine the second power module among the multiple power modules as the power module to be shut down, where the second power module is the power module among the multiple power modules whose electrical parameters are not within the preset parameter range.

[0100] When the regulation type of the multi-module parallel system is passive regulation, determine the power module (hereinafter referred to as the second power module for distinction) among the multiple power modules whose electrical parameters are not within the preset parameter range as the power module to be shut down.

[0101] In a specific embodiment, the control unit detects the fault status of each module in real time. When x (1 ≤ x < N, positive integer) modules fail, control the faulty modules to stop running immediately and prompt the corresponding fault information.

[0102] In this way, based on the electrical parameters of the multiple power modules during operation, the present application determines the regulation type of the multi-module parallel system, and then determines the abnormally operating power module among the multiple power modules, that is, the power module to be shut down, and controls the power module to be shut down to stop running. In this way, compared with the traditional control method of starting and stopping all power modules without distinction at the same time, the embodiment of the present application determines the power module to be shut down in each power module based on the regulation type of the multi-module parallel system, and only controls the power module to be shut down to stop running, retaining the other power modules except the power module to be shut down, ensuring the availability of the multi-module parallel system, thereby improving the reliability of the multi-module parallel system.

[0103] Further, based on the first embodiment of the multi-module parallel control method of the present application, a second embodiment of the multi-module parallel control method of the present application is proposed.

[0104] In this embodiment, after the step S20, the steps C10 to C20 are further included:

[0105] Step C10, when the regulation type is active regulation, record the target time when the power module to be shut down stops running. After a preset duration at the target time, randomly select a third number of power modules from the power modules to be shut down as the first power modules, where the sum of the third number and the second number is the first number.

[0106] Step C20, control the first power modules to start running, update the power modules other than the first power modules among the multiple power modules as the power modules to be shut down, and return to execute the step of controlling the power modules to be shut down to stop running.

[0107] The third quantity is the result of subtracting the second quantity from the first quantity, and has the same meaning as the number of running modules. When the control type of the multi-module parallel system is active control, the moment when the module to be shut down stops running is recorded, hereinafter referred to as the target moment. After the preset duration of the target moment, a third number of power modules (hereinafter referred to as the first power module for distinction) are arbitrarily selected from the modules to be shut down, and the first power module is controlled to start running, and then the power modules except the first power module in the multiple power modules are updated to the modules to be shut down, and the step of shutting down the modules to be shut down is returned to execute, thereby realizing the cyclic operation of multiple power modules and avoiding the continuous operation of the same power module within two adjacent preset durations.

[0108] It should be noted that the present application refers to the Nx operation control mode under the light load condition of the system as the active Nx operation control mode. For example, Figure 5 The figure shows a schematic diagram of the active Nx operation processing flow. First, the multi-module system is turned on, the current information of each power module is obtained, and the total power P_total of the system is calculated based on the current information and the parallel AC voltage. Then, the ratio of the rated power P_rate and P_total is calculated to determine whether the ratio of P_rate and P_total is greater than or equal to 2; if not, return to the step of obtaining the module current information; if so, c is substituted into the formula M=N*c, at this time, the value range of c is (0,0.5], and the number of modules that stop running x is counted, and the calculation formula of x is x=NM, and then any M modules among the multiple modules are controlled to continue running, and each x module is controlled to stop running; finally, after the preset time T, the module that did not run last time is switched to run, to ensure that M modules are running and x modules are stopped at the same time.

[0109] In this way, when the system is lightly loaded, the present application determines the number of modules working simultaneously through a real-time power allocation algorithm, that is, dynamically adjusts the number of working modules, thereby ensuring that only some modules work within a certain period of time, and all modules work in turn during the entire working time. On the one hand, it takes into account the heat distribution on each power module in the multi-module parallel system, and on the other hand, it minimizes the switching loss of the multi-module parallel system.

[0110] Furthermore, based on the above-mentioned first embodiment and / or second embodiment of the multi-module parallel control method of the present application, a third embodiment of the multi-module parallel control method of the present application is proposed.

[0111] In this embodiment, after the above step S30, steps D10 to D20 are further included:

[0112] Step D10, in the case where the regulation type is passive regulation, calculate the average output power of each third power module based on the total output power of multiple said power modules, where the third power module is a power module other than the module to be shut down among the multiple said power modules.

[0113] Step D20, if the average output power is greater than the preset rated power, control the multi-module parallel system to shut down.

[0114] In the case where the regulation type of the multi-module parallel system is passive regulation, determine the power modules other than the module to be shut down among the multiple power modules (hereinafter referred to as the third power modules for distinction), calculate the average output power of each third power module based on the total output power of each power module, and then detect whether the average output power is greater than the preset rated power. The preset rated power is set in advance according to actual requirements. When it is detected that the average output power is greater than the preset rated power, control the multi-module parallel system to shut down.

[0115] In a specific embodiment, the above-mentioned third power module can be understood as the power module currently in operation after shutting down the module to be shut down with a fault. The calculation formula for the average power of the currently operating module is: P_ave = P_total / (N - x). When the control unit determines that P_ave < P_unit (assuming equal power distribution among different modules here), it indicates that the remaining modules can keep the system running continuously. Otherwise, the control unit performs protection shutdown according to the overload protection time. Here, P_unit represents the long-term operating power of a single module, that is, the above-mentioned preset rated power.

[0116] It should be noted that in the case where the regulation type of the multi-module parallel system in this application is a power device fault, the N - x operation control method is called the passive N - x operation control method. Exemplarily, as Figure 6 shown in the schematic diagram of the passive N - x operation processing flow, first, the multi-module system is powered on, the current information of each power module is obtained, and the total power P_total of the system is calculated based on this current information and the parallel AC voltage. Then, it is detected whether each power module is faulty; if not, the step of obtaining the module current information is returned for execution; if so, the faulty module is shut down, and other modules continue to operate, and the number of faulty modules x is counted. Then, the average power P_ave of the normally operating modules is calculated, and it is detected whether the average power P_ave is less than P_unit; if so, the step of obtaining the module current information is returned for execution; if not, the multi-module parallel system is protected according to the overload capacity, and the multi-module parallel system is controlled to shut down.

[0117] In this way, when a single or partial module fails, the present application determines whether the system is shut down or in Nx operation based on the module capacity calculated in real time. For situations that meet the Nx operation requirements, the faulty module automatically exits work and prompts the fault information to the outside, and other normal units bear all the loads to ensure reliable and continuous operation of the system, and minimize the number of times the entire system is shut down due to single or partial module failures, so as to improve the reliability of the multi-module parallel system. Moreover, the Nx operation control method proposed in the present application does not require additional hardware communication between farms and reclamation sites, and can automatically realize the dynamic adjustment of the number of operating modules, saving control costs.

[0118] In addition, an embodiment of the present application also provides a frequency converter, which includes a plurality of power modules connected in parallel.

[0119] Please refer to Figure 7 , Figure 7 This is a functional module diagram of an embodiment of the frequency converter of the present application, such as Figure 7 As shown, the frequency converter of this application includes:

[0120] A type determination module 10, configured to determine a control type of the multi-module parallel system based on respective power parameters of the plurality of power modules;

[0121] The shutdown module 20 is used to determine a module to be shut down among the multiple power modules based on the regulation type, and control the module to be shut down to stop running.

[0122] Furthermore, the type determination module 10 includes:

[0123] A first calculation unit, configured to calculate a total output power of the plurality of power modules based on respective power parameters of the plurality of power modules;

[0124] A second calculation unit, used to calculate the ratio between the total output power and the rated power of the multi-module parallel system;

[0125] The first abnormality determination unit is used to determine that the control type of the multi-module parallel system is active control when the ratio is less than a preset value.

[0126] Furthermore, the shutdown module 20 includes:

[0127] a third calculation unit, configured to calculate a second number based on the first number of the plurality of power modules and the ratio when the regulation type is active regulation;

[0128] The first abnormality determination unit is used to arbitrarily select the second number of power modules from the plurality of power modules as modules to be shut down.

[0129] Furthermore, the frequency converter of the present application further includes:

[0130] a reselection module, configured to, when the regulation type is active regulation, record a target time at which the modules to be shut down stop running, and after a preset time period of the target time, arbitrarily select a third number of power modules from the modules to be shut down as first power modules, wherein the sum of the third number and the second number is the first number;

[0131] An update module is used to control the first power module to start running, update the power modules other than the first power module among the multiple power modules to the modules to be shut down, and return to execute the step of controlling the modules to be shut down to stop running.

[0132] Furthermore, the type determination module 10 includes:

[0133] A detection unit, used to detect whether the power parameters of each of the power modules are within a preset parameter range;

[0134] The second abnormality determination unit is used to determine that the control type of the multi-module parallel system is passive control if it is detected that the power parameter of at least one power module among the power modules is not within the preset parameter range.

[0135] Furthermore, the shutdown module 20 includes:

[0136] The second abnormality determination unit is used to determine, when the control type is passive control, that a second power module among the multiple power modules is a module to be shut down, wherein the second power module is a power module among the multiple power modules whose power parameters are not within the preset parameter range.

[0137] Furthermore, the frequency converter of the present application further includes:

[0138] a calculation module, configured to calculate, when the regulation type is passive regulation, an average output power of each third power module based on the total output power of the plurality of power modules, wherein the third power module is a power module other than the module to be shut down among the plurality of power modules;

[0139] The shutdown protection module is used to control the multi-module parallel system to shut down if the average output power is greater than the preset rated power.

[0140] The present application also provides a computer storage medium, on which a multi-module parallel control program is stored. When the multi-module parallel control program is executed by a processor, the steps of the multi-module parallel control program method described in any of the above embodiments are implemented.

[0141] The specific embodiments of the computer storage medium of the present application are basically the same as the above-mentioned embodiments of the multi-module parallel control program method of the present application, and will not be repeated here.

[0142] The present application also provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps of the multi-module parallel control method of the present application as described in any of the above embodiments are implemented, which will not be repeated here.

[0143] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article 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 process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0144] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0145] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, including several instructions for enabling a frequency converter (which can be a TWS headset, etc.) to execute the methods described in each embodiment of the present application.

[0146] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A multi-module parallel control method, characterized in that: The multi-module parallel control method is applied to a multi-module parallel system, wherein the multi-module parallel system includes a plurality of parallel power modules, and the multi-module parallel control method includes the following steps: Determining the control type of the multi-module parallel system based on the power parameters of each of the plurality of power modules; A module to be shut down among the plurality of power modules is determined based on the regulation type, and the module to be shut down is controlled to stop running.

2. The multi-module parallel control method according to claim 1, characterized in that: The step of determining the regulation type of the multi-module parallel system based on the power parameters of each of the plurality of power modules comprises: Calculating the total output power of the plurality of power modules based on the respective power parameters of the plurality of power modules; Calculating a ratio between the total output power and the rated power of the multi-module parallel system; When the ratio is less than a preset value, it is determined that the control type of the multi-module parallel system is active control.

3. The multi-module parallel control method according to claim 2, characterized in that: The step of determining a module to be shut down among the plurality of power modules based on the regulation type comprises: When the control type is active control, calculating the second number based on the first number of the plurality of power modules and the ratio; The second number of power modules are arbitrarily selected from the plurality of power modules as modules to be shut down.

4. The multi-module parallel control method according to claim 3, characterized in that: After the step of controlling the module to be shut down to stop running, the method further includes: In the case where the regulation type is active regulation, recording the target time when the module to be shut down stops running, and after a preset time of the target time, arbitrarily selecting a third number of power modules from the module to be shut down as the first power modules, wherein the sum of the third number and the second number is the first number; The first power module is controlled to start running, the power modules except the first power module among the multiple power modules are updated to the modules to be shut down, and the step of controlling the modules to be shut down to stop running is returned to be executed.

5. The multi-module parallel control method according to claim 1, characterized in that: The step of determining the regulation type of the multi-module parallel system based on the power parameters of each of the plurality of power modules comprises: Detecting whether the power parameters of each of the power modules are within a preset parameter range; If it is detected that the power parameter of at least one of the power modules is not within the preset parameter range, it is determined that the control type of the multi-module parallel system is passive control.

6. The multi-module parallel control method according to claim 5, characterized in that: The step of determining a module to be shut down among the plurality of power modules based on the regulation type comprises: When the control type is passive control, a second power module among the multiple power modules is determined as a module to be shut down, wherein the second power module is a power module among the multiple power modules whose power parameters are not within the preset parameter range.

7. The multi-module parallel control method according to claim 6, characterized in that: After the step of controlling the module to be shut down to stop running, the method further includes: In the case where the regulation type is passive regulation, the average output power of each third power module is calculated based on the total output power of the plurality of power modules, wherein the third power module is a power module other than the module to be shut down among the plurality of power modules; If the average output power is greater than the preset rated power, the multi-module parallel system is controlled to shut down.

8. A frequency converter, characterized in that: The frequency converter comprises a plurality of power modules connected in parallel, and the frequency converter comprises: A type determination module, used to determine the control type of the multi-module parallel system based on the power parameters of each of the plurality of power modules; A shutdown module is used to determine a module to be shut down among the multiple power modules based on the regulation type, and control the module to be shut down to stop running.

9. A frequency converter, characterized in that: include: A memory and a processor, wherein the memory stores a multi-module parallel control program that can be run on the processor, and when the multi-module parallel control program is executed by the processor, the steps of the multi-module parallel control method as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a multi-module parallel control program, which, when executed by a processor, implements the steps of the multi-module parallel control method according to any one of claims 1 to 7.

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