Control method and device of parallel-operation charging system, controller and parallel-operation charging system
By forming a voltage ring and current average in the parallel charging system, dynamically adjusting the output current of the AC and DC power supply unit, the problem of unstable output of the charging module is solved and a more stable charging process is achieved.
Patent Information
- Application Number
- CN202411414624.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2025-08-12
AI Technical Summary
The output current of the charging module in the parallel charging system is unstable, resulting in frequent faults, and the existing master-slave control method is difficult to effectively solve.
By forming a voltage ring based on the preset reference voltage value and bus voltage, calculating the current average value and correcting the voltage ring parameters, generating a vector pulse modulation signal, and dynamically adjusting the output current of the AC-DC power supply unit to achieve equalization control.
It improves the stability of the output current of the parallel charging system, ensures the output balance of each AC and DC power supply unit, and reduces the probability of failure.
Smart Images
Figure CN120474155A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of parallel control, and in particular to a control method, device, controller and parallel charging system for a parallel charging system. Background Art
[0002] Parallel charging systems utilize multiple charging modules in parallel to improve charging efficiency and power. Compared to using a single charging module, parallel charging systems can significantly increase the maximum output current, thereby increasing charging speed and shortening charging time to meet growing charging needs.
[0003] However, to ensure stable output current, parallel charging systems often use a master-slave control scheme to manage each charging mode. In this scheme, the charging module is divided into a master and a slave. The master performs voltage regulation, while the slave uses current control. This means that when the charging module output fluctuates, the master needs to bear more current, which can easily cause failures and lead to unstable output current. Therefore, how to control the charging modules in a parallel charging system to improve the stability of the system's output current is an urgent problem that needs to be solved. Summary of the Invention
[0004] The embodiments of the present application provide a control method, device, controller, and parallel charging system for a parallel charging system, which control the charging modules in the parallel charging system, improve the stability of the output current of the parallel charging system, and at least partially solve the above-mentioned technical problems.
[0005] To achieve the above objectives, according to a first aspect of the present application, a control method for a parallel charging system is provided, comprising: forming a voltage loop based on a preset reference voltage value and a bus voltage to obtain voltage loop parameters; Calculating a current average based on the output current of each AC / DC power supply unit; Based on the current mean value and the output current of the AC / DC power supply unit, the voltage loop parameters are corrected to obtain a current reference value; A vector pulse modulation signal is generated based on the input current of the AC / DC power supply unit and the current reference value, and the AC / DC power supply unit is controlled according to the vector pulse modulation signal.
[0006] Optionally, the correcting the voltage loop parameter based on the current mean value and the output current of the AC / DC power supply unit to obtain a current reference value includes: performing a proportional integral operation on a current deviation value between the current mean value and the output current of the AC / DC power supply unit to obtain a deviation correction value; The current reference value is obtained based on the deviation correction amount and the voltage loop parameter.
[0007] Optionally, obtaining the current reference value based on the deviation correction amount and the voltage loop parameter includes: Obtaining a current limiting range of the current reference value; Superimposing the deviation correction amount and the voltage loop parameter to obtain a theoretical current value; If the theoretical current value is within the current limiting range, the theoretical current value is used as the current reference value; If the theoretical current value is not within the current limiting range, the current reference value is determined based on the current limiting range.
[0008] Optionally, obtaining the current limiting range of the current reference value includes: When the AC / DC power supply unit is abnormal, obtaining a preset range of the current reference value; Obtaining a first current limit required by the abnormal AC / DC power supply unit due to the abnormality; Based on the preset range and the first current limit, a current limit range of the abnormal current reference value of the AC / DC power supply unit is obtained.
[0009] Optionally, the parallel charging system includes a plurality of the AC and DC power supply units. When an abnormal AC and DC power supply unit exists in the parallel charging system, calculating the current average based on the output current of each AC and DC power supply unit includes: Determine the number of AC and DC power supply units that are in normal operation; Obtain the output current of the AC / DC power supply unit in normal operation; The current average is calculated based on the number and the output current of the AC / DC power supply unit in normal operation.
[0010] Optionally, the parallel charging system further includes a DC power supply module, and the method further includes: In response to the current average being greater than or equal to the maximum value of the current limiting range, a current limiting instruction is output to the DC power supply module.
[0011] Optionally, the current limiting instruction includes a second current limiting value; and after outputting the current limiting instruction to the DC power supply module, the method further includes: Obtaining a preset operating current of the DC power supply module; Based on the second current limiting value, the preset operating current is adjusted to obtain the current limiting operating current of the DC power supply module.
[0012] Optionally, forming a voltage loop based on a preset reference voltage value and a bus voltage to obtain voltage loop parameters includes: A proportional integral operation is performed on a voltage deviation value between the preset reference voltage value and the bus voltage to obtain the voltage loop parameter.
[0013] Optionally, generating a vector pulse modulation signal based on the input current of the AC / DC power supply unit and the current reference value, and controlling the AC / DC power supply unit according to the vector pulse modulation signal includes: generating an active current based on an input current of the AC / DC power supply unit; Subtracting the active current from the current reference value to obtain an active current deviation value; A proportional-integral operation is performed on the active current deviation value to obtain an active control parameter, and the vector pulse modulation signal is generated based on the active control parameter.
[0014] Optionally, the generating active current based on the input current of the AC / DC power supply unit includes: The input current of the DC power supply unit is input into a preset coordinate transformation algorithm to obtain the active current.
[0015] According to a second aspect of the present application, a control device for a parallel charging system is provided, comprising: A current loop module is used to form a voltage loop based on a preset reference voltage value and a bus voltage to obtain voltage loop parameters; A mean value calculation module, configured to calculate a current mean value based on the output current of each AC / DC power supply unit; a voltage loop module, configured to correct the voltage loop parameters based on the current mean value and the output current of the AC / DC power supply unit to obtain a current reference value; The signal generating module is configured to generate a vector pulse modulation signal based on an input current of the AC / DC power supply unit and the current reference value, and control the AC / DC power supply unit according to the vector pulse modulation signal.
[0016] According to a third aspect of the present application, a controller is provided, comprising: Memory; processor; The processor has stored thereon a computer program executed by the processor; When the computer program is executed by the processor, the processor executes the control method of the parallel charging system as described above.
[0017] According to a fourth aspect of the present application, a parallel charging system is provided, comprising the controller as described above.
[0018] In summary, the present application first obtains the voltage loop parameters through the voltage loop in order to determine the overall output level of the AC / DC power supply module, then corrects the voltage loop parameters based on the current mean, and generates a current loop reference value to dynamically adjust the output current of each AC / DC power supply unit so that the output current of each AC / DC power supply unit is balanced. Finally, the input current and current reference value of the AC / DC power supply unit are used to generate a vector pulse modulation signal. The vector pulse modulation signal combines the voltage loop parameters that characterize the overall output level and the current mean for controlling the output current balance of each AC / DC power supply module, so that each AC / DC power supply unit can be independently controlled by the vector pulse modulation signal and the output balance of each AC / DC power supply unit can be maintained, thereby improving the stability of the output current of the parallel charging system.
[0019] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.
[0020] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.
[0021] Figure 1 is a flow chart of a control method of a parallel charging system provided in an exemplary embodiment of the present disclosure; Figure 2 is a structural schematic diagram of a parallel charging system provided in an exemplary embodiment of the present disclosure; Figure 3 is a flow chart of a current average value generating method provided in an exemplary embodiment of the present disclosure; Figure 4 is a flow chart of a method for determining a current reference value provided in an exemplary embodiment of the present disclosure; Figure 5 is a schematic structural diagram of a voltage loop, a current loop, and a current sharing loop provided in an exemplary embodiment of the present disclosure; Figure 6 is a flow chart of a method for determining a current limiting range provided in an exemplary embodiment of the present disclosure; Figure 7 is a flowchart of a method for generating a vector pulse modulation signal provided in an exemplary embodiment of the present disclosure; Figure 8FIG. 1 is a schematic diagram of a control device of a parallel charging system provided in an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.
[0023] According to the first aspect of this application, referring to Figures 1 to 5 The present disclosure provides a control method for a parallel charging system, including steps S101 to S104, which are described in detail below.
[0024] Step S101: forming a voltage loop based on a preset reference voltage value and a bus voltage to obtain voltage loop parameters.
[0025] For example, a preset reference voltage value is used to represent the desired stable bus voltage in a parallel charging system. The voltage loop is used to maintain the bus voltage near the preset reference voltage value. By comparing the actual bus voltage with the preset reference voltage value, the voltage error is calculated, and the output is adjusted to reduce the error.
[0026] Step S102: Calculating a current average based on the output current of each AC / DC power supply unit.
[0027] The parallel charging system includes AC / DC power supply units, DC power supply units and busbars. Figure 2 As an example of a parallel charging system, there are n AC / DC power supply units, namely ACDC1, ACDC2, ..., ACDCn; and n DC power supply units, namely DCDC1, DCDC2, ..., DCDCn. "BUS" represents the bus. The AC / DC power supply units receive AC power from the grid, convert it into stable DC power after rectification and filtering, and output it via the bus. The DC power supply units, acting as post-conversion devices, receive the DC power output from the AC / DC power supply units to the bus and adjust their output current and voltage based on actual charging needs, thereby controlling the charging power.
[0028] As an example, the current mean is calculated by averaging the output currents of all AC and DC power supply units, reflecting the overall current output level of the AC and DC power supply units. If the current mean is too high, it means that the load of the AC and DC power supply units is high.
[0029] Step S103: Based on the current average value and the output current of the AC / DC power supply unit, the voltage loop parameters are corrected to obtain a current reference value.
[0030] As an example, the output of the voltage loop is adjusted by calculating the current mean to balance the current output of each AC / DC power supply unit. For example, if the output current of one of the AC / DC power supply units is higher than the current mean, its current output can be reduced by reducing its corresponding voltage loop parameters; and if the output current of one of the AC / DC power supply units is lower than the current mean, its current output can be increased by increasing its corresponding voltage loop parameters. The voltage loop parameters corrected by the current mean are used as the current reference value, that is, as the expected current output value set for each AC / DC power supply unit, thereby achieving output balancing for each AC / DC power supply unit.
[0031] Step S104: generating a vector pulse modulation signal based on the input current of the AC / DC power supply unit and the current reference value, and controlling the AC / DC power supply unit according to the vector pulse modulation signal.
[0032] As an example, a vector pulse modulation signal can be generated using space vector pulse width modulation (SVPWM). This pulse modulation strategy controls the switching devices in the AC / DC power supply unit, thereby controlling the output voltage and current of the AC / DC power supply unit. In space vector pulse width modulation, parameters such as the modulation ratio and carrier frequency must be set to generate the vector pulse modulation signal. These parameters are set using the input current and current reference value of the AC / DC power supply unit to produce the vector pulse modulation signal.
[0033] In the above embodiment, the voltage loop parameters are first obtained through the voltage loop to determine the overall output level of the AC / DC power modules. The voltage loop parameters are then corrected based on the current mean, and a current loop reference value is generated to dynamically adjust the output current of each AC / DC power unit so that the output current of each AC / DC power unit is balanced. Finally, a vector pulse modulation signal is generated using the input current and current reference value of the AC / DC power unit. The vector pulse modulation signal combines the voltage loop parameters representing the overall output level and the current mean for controlling the output current balance of each AC / DC power module. This allows the vector pulse modulation signal to independently control each AC / DC power unit and maintain the output balance of each AC / DC power unit, thereby improving the stability of the output current of the parallel charging system.
[0034] In some embodiments, step S101 may include performing a proportional integral operation on a voltage deviation value between a preset reference voltage value and the bus voltage to obtain voltage loop parameters.
[0035] Reference Figure 3 In some embodiments, the parallel charging system includes several AC and DC power supply units. When there is an abnormal AC and DC power supply unit in the parallel charging system, step S102 may include steps S1021 to S1023, which are described in detail below.
[0036] Step S1021: Determine the number of AC and DC power supply units that are operating normally.
[0037] Step S1022: Obtain the output current of the AC / DC power supply unit that is operating normally.
[0038] As an example, when there is an abnormal AC / DC power supply unit, in order to ensure that the abnormal AC / DC power supply unit is not damaged, the output current of the abnormal AC / DC power supply unit is usually reduced. If the output current of the abnormal AC / DC power supply unit is used as part of the calculated current average, the calculated current average may be too low, resulting in a reduction in the output current of all AC / DC power supply units. Therefore, only the output current of the normal AC / DC power supply unit is obtained as the basis for calculating the current average.
[0039] It should be noted that, for abnormal AC and DC power supply units, they are no longer controlled by the current average value, but are operated with limited power.
[0040] Step S1023: Calculating a current average based on the number of normally operating AC and DC power supply units and the output currents of the normally operating AC and DC power supply units.
[0041] In the above embodiment, by determining the number of normally operating power supply units, obtaining the output current of the normally operating power supply units, and calculating the current average, the influence of abnormal AC and DC modules is eliminated, and the load level of the current normal AC and DC power supply modules can be more accurately reflected.
[0042] As an example, when there is no abnormal AC / DC power supply unit in the parallel charging system, the current average is calculated based on the total number of AC / DC power supply units and the output current of each AC / DC power supply unit.
[0043] In some embodiments, step S103 may include steps S1031 and S1032, which are described in detail below.
[0044] Step S1031: performing a proportional integral operation on the current mean value and the output current of the AC / DC power supply unit to obtain a deviation correction value.
[0045] As an example, the current deviation reflects the unevenness or abnormality in load distribution of each power supply unit. A current sharing loop is formed based on the current mean and the output current of the AC and DC power supply units, and current sharing control is achieved by generating a deviation correction amount.
[0046] Step S1032: Obtain a current reference value based on the deviation correction amount and the voltage loop parameter.
[0047] In the above embodiment, the deviation correction amount obtained by performing a proportional integral operation between the current mean and the output current of the AC / DC power supply units can be used to adjust the output current of each AC / DC power supply unit in real time to reduce the deviation of the output current of each AC / DC power supply unit and the unevenness of load distribution.
[0048] Reference Figure 4 In some embodiments, step S1032 may include steps S201 to S204, which are described in detail below.
[0049] Step S201: obtaining a current limiting range of a current reference value.
[0050] As an example, the current limiting range is an allowable range of the current reference value, and the upper limit and the lower limit of the current limiting range are used to ensure that the current reference value is not too high or too low.
[0051] Step S202: superimpose the deviation correction amount and the voltage loop parameter to obtain the current theoretical value.
[0052] As an example, since the deviation correction amount represents the gap between the current AC / DC power supply module and the current average, and the voltage loop parameter represents the desired stable value of the bus voltage, the deviation correction amount and the voltage loop parameter are superimposed to obtain the theoretical current value with the best control effect, that is, the theoretical current value is the optimal current value that can simultaneously meet the current sharing output of the AC / DC power supply module and achieve the stable value of the bus voltage.
[0053] Step S203: If the theoretical current value is within the current limiting range, the theoretical current value is used as the current reference value.
[0054] Step S204: If the theoretical current value is not within the current limiting range, a current reference value is determined based on the current limiting range.
[0055] For example, while the theoretical current value is the optimal current value that simultaneously meets the requirements for equalizing the output current of the AC / DC power modules and achieving a stable bus voltage, to ensure that each AC / DC power module does not operate under overload for extended periods, an upper limit for the current reference value must be set using the current limit range. For example, when the theoretical current value exceeds the current limit range, the upper limit of the current limit range can be used as the current reference value to ensure that the current value is as close to the theoretical current value as possible while protecting the AC / DC power modules from damage.
[0056] As an example, see Figure 5 , Figure 5This example illustrates the structure of the current loop, voltage loop, and current sharing loop for controlling a single AC / DC power supply unit. The current loop is formed based on the current reference value and the input current of each AC / DC power supply module. PI represents a controller for performing proportional-integral operations. In the voltage loop, Vref represents the preset reference voltage value; Vbus represents the bus voltage. In the current sharing loop, Iavg represents the average current value, and Io represents the output current of each AC / DC power supply module. Figure 2 For example, when there are n AC / DC power modules, Io may include Io1, Io2, ..., Ion, Limit represents a current limiting module for limiting the current reference value, Iref represents the current reference value after current limiting, and Id represents the active current generated by the input current of each AC / DC power module. For example, when there are n AC / DC power modules, Id may include Id1, Id2, Id3, ..., Idn. SVMVP represents a quantity pulse modulation signal.
[0057] Reference Figure 6 In some embodiments, step S201 may include steps S2011 to S2013, which are described in detail below.
[0058] Step S2011: When the AC / DC power supply unit is abnormal, a preset range of a current reference value is obtained.
[0059] For example, the preset range can be set based on factors such as the design specifications of the AC / DC power supply unit, rated current, maximum allowable current, and safe long-term operating current. The preset range typically includes a lower limit and an upper limit, which define a safe operating range for the current reference value. The lower limit can be set to zero.
[0060] Step S2012: obtaining a first current limit required by the abnormal AC / DC power supply unit due to the abnormality.
[0061] As an example, the first current limit value refers to a current limit value that needs to be implemented to cope with a current abnormality. The abnormality may include an overheating condition or other overcurrent faults.
[0062] Step S2013: Based on the preset range and the first current limit, a current limit range of the abnormal AC / DC power supply unit's current reference value is obtained.
[0063] As an example, the upper limit of the current limit range of the abnormal AC / DC power supply unit's current reference value can be expressed as IdMax1 = IdMax - Idtemp, where IdMax is the upper limit of the preset range and Idtemp is the first current limit. The lower limit of the current limit range of the abnormal AC / DC power supply unit's current reference value can be set to zero.
[0064] In some embodiments, when the AC / DC power supply unit is normal, the preset range of the current reference value can be directly used as the current limiting range.
[0065] In the above embodiment, by obtaining a preset range of the current reference value, calculating the first current limiting amount required due to the abnormality, and finally determining the current limiting range, when an abnormality occurs in the AC / DC power supply module, corresponding measures can be quickly taken to limit the current, thereby preventing the AC / DC power supply unit from being damaged due to overcurrent, and at the same time ensuring that the AC / DC power supply module can continue to operate stably under abnormal conditions.
[0066] In some embodiments, the parallel charging system further includes a DC power supply module, and the parallel charging system further includes outputting a current limiting instruction to the DC power supply module in response to the current average being greater than or equal to the maximum value of the current limiting range.
[0067] As an example, when the current average is greater than or equal to the maximum value of the current limit range, it indicates that the overall load of the AC / DC power supply unit is too high. At this time, the output current cannot be effectively controlled by the AC / DC current unit alone, and the charging power needs to be reduced by the back-end DC power supply module for power-limited charging. Figure 2 A communication unit can be provided between the AC / DC power supply unit and the DC power supply unit to enable data transmission between the AC / DC power supply unit and the DC power supply unit. For example, a current limiting instruction can be transmitted from the AC / DC power supply unit to the DC power supply unit via the communication unit.
[0068] In some embodiments, the current limiting instruction includes a second current limiting instruction. After outputting the current limiting instruction to the DC power supply module, the process may further include steps S301 and S302, which are described in detail below.
[0069] Step S301: obtaining a preset operating current of a DC power module.
[0070] Step S302: Based on the second current limiting value, the preset operating current is adjusted to obtain the current limiting operating current of the DC power module.
[0071] As an example, the current-limited operating current of the DC power module can be expressed as Ioref = IoMax - IacMax; wherein IoMax represents the preset operating current, that is, the unadjusted current operating current; and IacMax represents the second current limit.
[0072] In the above embodiment, by obtaining the preset operating current and adjusting it according to the second current limit in the current limit instruction, it is possible to ensure that the AC and DC power supply modules will not operate under overload for a long time, thereby reducing the risk of damage to the parallel charging system due to excessive current.
[0073] Reference Figure 7In some embodiments, step S104 may include steps S1041 to S1043, which are described in detail below.
[0074] Step S1041: generating active current based on the input current of the AC / DC power supply unit.
[0075] As an example, step S1041 may include inputting the input current of the AC / DC power supply unit into a preset coordinate transformation algorithm to obtain the active current. The coordinate transformation algorithm may adopt a DQ algorithm. The input current of the DC power supply unit is the three-phase voltage output by the three-phase power grid. Figure 2 Taking the AC / DC power supply unit ACDC1 as an example, the input current of the AC / DC power supply unit ACDC1 is the three-phase voltage Ia1, Ib1 and Ic1. Ia1, Ib1 and Ic1 are transformed using the coordinate transformation algorithm to obtain the active current and reactive current.
[0076] Among them, active current refers to the current part that can actually do work and be converted into useful energy. It is related to the output power of the AC / DC power supply unit. The overall output of the AC / DC power supply unit is controlled by controlling the active current.
[0077] Step S1042: Subtract the active current from the current reference value to obtain an active current deviation value.
[0078] Step S1043: performing a proportional-integral operation on the active current deviation value to obtain an active control parameter, and generating a vector pulse modulation signal based on the active control parameter.
[0079] As an example, a current loop is formed based on the active current and the current reference value to obtain the active power control parameter for generating the vector pulse modulation signal.
[0080] In addition, an embodiment of the present application discloses a control device for a parallel charging system. The control device for a parallel charging system can be applied to a controller. In this embodiment, the controller can include the control device for the parallel charging system, a machine-readable storage medium, and a processor.
[0081] In this embodiment, the machine-readable storage medium and the processor may be located in the controller and configured separately. The machine-readable storage medium may also be independent of the controller and accessed by the processor. The control device of the parallel charging system may include multiple functional modules stored in the machine-readable storage medium, such as the various software functional modules included in the control device of the parallel charging system. When the processor executes the computer programs corresponding to the software functional modules in the control device of the parallel charging system, the control device of the parallel charging system provided in the aforementioned method embodiment is implemented.
[0082] In this embodiment, the controller may include one or more processors. The processor may process information and / or data related to the service request to perform one or more functions described in the present invention. In some embodiments, the processor may include one or more processing engines (e.g., a single-core processor or a multi-core processor). Just to give an example, the processor may include one or more hardware processors, such as a central processing unit (CPU), an application-specific integrated circuit (ASIC), an application-specific instruction set processor (ASIP), a graphics processing unit (GPU), a physical processing unit (PPU), a digital signal processor (DSP), a field programmable gate array (FPGA), a programmable logic device (PLD), a controller, a microcontroller unit, a reduced instruction set computer (RISC), a microprocessor, etc., or similar or any combination thereof.
[0083] The machine-readable storage medium may store data and / or instructions. In some embodiments, the machine-readable storage medium may store acquired data or information. In some embodiments, the machine-readable storage medium may store data and / or instructions for execution or use by the controller, and the controller may execute or use the data and / or instructions to implement the exemplary methods described herein. In some embodiments, the machine-readable storage medium may include mass storage, removable storage, volatile read-write memory, read-only memory (ROM), or similar or any combination of the foregoing examples. Exemplary mass storage may include magnetic disks, optical disks, solid-state disks, etc. Exemplary removable storage may include flash drives, floppy disks, optical disks, memory cards, compact disks, magnetic tapes, etc. Exemplary volatile read-write memory may include random access memory (RAM). Exemplary random access memory may include dynamic RAM, double-speed synchronous dynamic RAM, static RAM, thyristor RAM, and zero-capacitor RAM. Exemplary ROM may include masked ROM, programmable ROM, erasable programmable ROM, electrically erasable programmable ROM, compact disk ROM, and digital versatile disk ROM.
[0084] The controller of the parallel charging system may include one or more software function modules. The software function modules may be programs or instructions stored in the machine-readable storage medium. When executed by a corresponding processor, these software function modules are used to implement the above-mentioned method. For example, when executed by a processor of a drone, they are used to implement the method steps performed by the drone, or when executed by the controller, they are used to implement the method steps performed by the controller.
[0085] Refer to the detailed Figure 8 According to a second aspect of the present disclosure, a control device for a parallel charging system is provided, comprising a current loop module, a mean value calculation module, a voltage loop module, and a signal generation module.
[0086] The current loop module is configured to form a voltage loop based on a preset reference voltage value and the bus voltage to obtain voltage loop parameters. The mean value calculation module is configured to calculate a current mean based on the output current of each AC / DC power supply unit. The voltage loop module is configured to modify the voltage loop parameters based on the current mean and the output current of the AC / DC power supply unit to obtain a current reference value. The signal generation module is configured to generate a vector pulse modulation signal based on the input current of the AC / DC power supply unit and the current reference value, and to control the AC / DC power supply unit according to the vector pulse modulation signal.
[0087] The current loop module, mean value calculation module, voltage loop module, and signal generation module of this embodiment are respectively used to implement steps S101 to S104 in the control method of the parallel charging system.
[0088] According to a third aspect of the present application, a controller is provided, comprising a memory and a processor; wherein a computer program to be executed by the processor is stored on the processor; when the computer program is executed by the processor, the processor executes the control method of the parallel charging system as described above.
[0089] According to a fourth aspect of the present application, a parallel charging system is provided, comprising the controller as described above.
[0090] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.
[0091] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0092] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.
[0093] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. Although the descriptions of each embodiment in the embodiments of the present application have different focuses, for parts that are not described in detail in a certain embodiment, please refer to the relevant embodiments of other embodiments. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.
Claims
1. A control method for a parallel charging system, characterized in that: include: forming a voltage loop based on a preset reference voltage value and a bus voltage to obtain voltage loop parameters; Calculating a current average based on the output current of each AC / DC power supply unit; Based on the current mean value and the output current of the AC / DC power supply unit, the voltage loop parameters are corrected to obtain a current reference value; A vector pulse modulation signal is generated based on the input current of the AC / DC power supply unit and the current reference value, and the AC / DC power supply unit is controlled according to the vector pulse modulation signal.
2. The control method of the parallel charging system according to claim 1, characterized in that: The correcting the voltage loop parameter based on the current mean value and the output current of the AC / DC power supply unit to obtain a current reference value includes: performing a proportional integral operation on a current deviation value between the current mean value and the output current of the AC / DC power supply unit to obtain a deviation correction value; The current reference value is obtained based on the deviation correction amount and the voltage loop parameter.
3. The control method of the parallel charging system according to claim 2, characterized in that: The obtaining of the current reference value based on the deviation correction amount and the voltage loop parameter includes: Obtaining a current limiting range of the current reference value; Superimposing the deviation correction amount and the voltage loop parameter to obtain a theoretical current value; If the theoretical current value is within the current limiting range, the theoretical current value is used as the current reference value; If the theoretical current value is not within the current limiting range, the current reference value is determined based on the current limiting range.
4. The control method of the parallel charging system according to claim 3, characterized in that: The obtaining of the current limiting range of the current reference value includes: When the AC / DC power supply unit is abnormal, obtaining a preset range of the current reference value; Obtaining a first current limit required by the abnormal AC / DC power supply unit due to the abnormality; Based on the preset range and the first current limit, a current limit range of the abnormal current reference value of the AC / DC power supply unit is obtained.
5. The control method of the parallel charging system according to claim 1, wherein the parallel charging system comprises a plurality of AC and DC power supply units, characterized in that: When an abnormal AC / DC power supply unit exists in the parallel charging system, calculating the current average based on the output current of each AC / DC power supply unit includes: Determine the number of AC and DC power supply units that are in normal operation; Obtain the output current of the AC / DC power supply unit in normal operation; The current average is calculated based on the number and the output current of the AC / DC power supply unit in normal operation.
6. The control method of the parallel charging system according to claim 3, wherein the parallel charging system further comprises a DC power supply module, characterized in that: Also includes: In response to the current average being greater than or equal to the maximum value of the current limiting range, a current limiting instruction is output to the DC power supply module.
7. The control method of the parallel charging system according to claim 6, characterized in that: The current limiting instruction includes a second current limiting instruction; after outputting the current limiting instruction to the DC power supply module, the method further includes: Obtaining a preset operating current of the DC power supply module; Based on the second current limiting value, the preset operating current is adjusted to obtain the current limiting operating current of the DC power supply module.
8. The control method of the parallel charging system according to claim 1, characterized in that: The forming of a voltage loop based on a preset reference voltage value and a bus voltage to obtain voltage loop parameters includes: A proportional integral operation is performed on a voltage deviation value between the preset reference voltage value and the bus voltage to obtain the voltage loop parameter.
9. The control method of the parallel charging system according to any one of claims 1 to 8, characterized in that: The generating of a vector pulse modulation signal based on the input current of the AC / DC power supply unit and the current reference value, and controlling the AC / DC power supply unit according to the vector pulse modulation signal, includes: generating an active current based on an input current of the AC / DC power supply unit; Subtracting the active current from the current reference value to obtain an active current deviation value; A proportional-integral operation is performed on the active current deviation value to obtain an active control parameter, and the vector pulse modulation signal is generated based on the active control parameter.
10. The control method of the parallel charging system according to claim 9, characterized in that: The generating active current based on the input current of the AC / DC power supply unit includes: The input current of the DC power supply unit is input into a preset coordinate transformation algorithm to obtain the active current.
11. A control device for a parallel charging system, characterized in that: include: A current loop module is used to form a voltage loop based on a preset reference voltage value and a bus voltage to obtain voltage loop parameters; A mean value calculation module, configured to calculate a current mean value based on the output current of each AC / DC power supply unit; a voltage loop module, configured to correct the voltage loop parameters based on the current mean value and the output current of the AC / DC power supply unit to obtain a current reference value; The signal generating module is configured to generate a vector pulse modulation signal based on an input current of the AC / DC power supply unit and the current reference value, and control the AC / DC power supply unit according to the vector pulse modulation signal.
12. A controller, characterized in that: include: Memory; processor; The processor has stored thereon a computer program executed by the processor; When the computer program is executed by the processor, the processor executes the control method of the parallel charging system according to any one of claims 1 to 10.
13. A parallel charging system, characterized in that: Comprising the controller of claim 12.