A method, device, equipment and medium for suppressing circulating current

Abstract

The present invention discloses a method, device, equipment and medium for suppressing circulating current, including: determining an equivalent circuit model according to the circuit structure of a common DC dual-motor controller to be optimized; determining a target loop from the equivalent circuit model according to the impedance distribution in the equivalent circuit model; determining a target device to be optimized and the target parameter value of the target device in the target loop according to the resonance frequency change rule and / or the ripple current frequency change rule of the target loop; optimizing the target device according to the target parameter value to suppress the circulating current in the target loop. According to the resonance frequency change rule and / or the ripple current frequency change rule in the target loop, the present invention can determine the target device to be optimized, and then optimize the target device to suppress the circulating current in the target loop. The present invention can be used for substantially all common DC dual-motor controllers, can provide a solution direction for suppressing circulating current, reduces the process of repeated rectification in the test stage, and reduces the test cost.

Description

Technical Field

[0001] The present invention relates to the technical field of controllers, and particularly to a method, device, equipment and medium for suppressing circulating current. Background Art

[0002] In new energy vehicles, the drive motor needs to be controlled by a motor controller. According to different drive modes, a hybrid vehicle needs to drive two sets of motors, namely a motor and a generator, simultaneously. In order to meet the performance requirements, a high-performance pure electric vehicle needs to use a coaxial dual-motor system. And two sets of motors require two sets of motor controllers to control them respectively. To meet the requirements of integration and cost, the dual-motor controller usually adopts an integrated design to obtain a common DC dual-motor controller, that is, a motor controller product integrates two sets of control units to realize the control of the dual motors.

[0003] However, in the actual use process, the common DC dual-motor controller generates serious heat, resulting in low reliability of the common DC dual-motor controller. Summary of the Invention

[0004] By providing a method, device, equipment and medium for suppressing circulating current, the embodiments of the present application solve the technical problems that the common DC dual-motor controller in the prior art generates serious heat and has low reliability, and achieve the technical effects of reducing the heat generation degree of the common DC dual-motor controller and improving the reliability of the common DC dual-motor controller.

[0005] In a first aspect, the present application provides a method for suppressing circulating current, and the method includes:

[0006] Determine an equivalent circuit model according to the circuit structure of the common DC dual-motor controller to be optimized;

[0007] Determine a target loop from the equivalent circuit model according to the impedance distribution in the equivalent circuit model;

[0008] Determine the target device to be optimized in the target loop and the target parameter value of the target device according to the resonance frequency change rule and / or the ripple current frequency change rule of the target loop;

[0009] Optimize the target device according to the target parameter value to suppress the circulating current of the target loop.

[0010] Further, determining a target loop from the equivalent circuit model according to the impedance distribution in the equivalent circuit model includes:

[0011] Determine the actual current flow direction in the equivalent circuit model according to the impedance distribution in the equivalent circuit model;

[0012] Determine the target loop from the equivalent circuit model according to the ideal current flow direction and the actual current flow direction of the equivalent circuit model.

[0013] Further, according to the variation law of the resonance frequency of the target circuit, determine the target device to be optimized and the target parameter value of the target device in the target circuit, including:

[0014] According to the variation law of the resonance frequency of the target circuit, determine the first parameter set related to the resonance frequency of the target circuit;

[0015] According to the adjustment difficulty of the circuit devices corresponding to the parameters in the first parameter set, determine the target device to be optimized and the target parameter value from the circuit devices corresponding to the parameters in the first parameter set.

[0016] Further, determine the target parameter value, including:

[0017] Obtain the first correlation relationship between the parameter value of the target device, the resonance frequency of the target circuit, and the loop current of the target circuit;

[0018] According to the first correlation relationship and the preset ripple current value of the target circuit, determine the target parameter value.

[0019] Further, according to the variation law of the ripple current frequency of the target circuit, determine the target device to be optimized and the target parameter value of the target device in the target circuit, including:

[0020] According to the variation law of the ripple current frequency of the target circuit, determine the second parameter set related to the ripple current frequency of the target circuit;

[0021] According to the adjustment difficulty of the circuit devices corresponding to the parameters in the second parameter set, determine the target device to be optimized and the target parameter value from the circuit devices corresponding to the parameters in the second parameter set.

[0022] Further, according to the variation law of the resonance frequency and the variation law of the ripple current frequency of the target circuit, determine the target device to be optimized and the target parameter value of the target device in the target circuit, including:

[0023] According to the variation law of the resonance frequency of the target circuit, determine the first alternative device;

[0024] According to the variation law of the ripple current frequency of the target circuit, determine the second alternative device;

[0025] According to the adjustment difficulty of the first alternative device and the second alternative device, select one device from the first alternative device and the second alternative device as the target device, and determine the target parameter value corresponding to the target device.

[0026] In a second aspect, the present application provides a circulating current suppression device, and the device includes:

[0027] An equivalent circuit model determination module, configured to determine an equivalent circuit model according to the circuit structure of a co-DC dual-motor controller to be optimized;

[0028] A target loop determination module, configured to determine a target loop from the equivalent circuit model according to the impedance distribution in the equivalent circuit model;

[0029] A target device determination module, configured to determine a target device to be optimized and a target parameter value of the target device in the target loop according to the resonance frequency variation law and / or the ripple current frequency variation law of the target loop;

[0030] An optimization module, configured to optimize the target device according to the target parameter value to suppress the circulating current of the target loop.

[0031] Further, the target loop determination module includes:

[0032] An actual current flow direction determination sub-module, configured to determine the actual current flow direction in the equivalent circuit model according to the impedance distribution in the equivalent circuit model;

[0033] A target loop determination sub-module, configured to determine the target loop from the equivalent circuit model according to the ideal current flow direction and the actual current flow direction of the equivalent circuit model.

[0034] In a third aspect, the present application provides an electronic device, including:

[0035] A processor;

[0036] A memory for storing instructions executable by the processor;

[0037] Wherein, the processor is configured to execute to implement a circulating current suppression method provided in the first aspect.

[0038] In a fourth aspect, the present application provides a non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by the processor of the electronic device, enabling the electronic device to execute and implement a circulating current suppression method provided in the first aspect.

[0039] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0040] In the embodiments of the present application, the impedance distribution in the equivalent circuit model of the common DC dual-motor controller is used to determine the target loop to be optimized. According to the variation law of the resonant frequency and / or the variation law of the ripple current frequency in the target loop, the target device to be optimized can be determined, and then the target device can be optimized to suppress the circulating current in the target loop. It can be seen that the embodiments of the present application can be used for substantially all types of common DC dual-motor controllers, can provide a solution direction for suppressing the circulating current, thereby reducing the process of repeated rectification in the test stage, reducing the test cost, and shortening the test cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0042] Figure 1 is a schematic circuit structure diagram of a single-motor controller;

[0043] Figure 2 is a schematic circuit structure diagram of a common DC dual-motor controller;

[0044] Figure 3 is a schematic flow chart of a circulating current suppression method provided by the present application;

[0045] Figure 4 In the present application, according to Figure 2 is a schematic diagram of the equivalent circuit model structure obtained from the circuit structure shown;

[0046] Figure 5 In the present application, based on Figure 4 is another schematic diagram of the equivalent circuit model structure obtained;

[0047] Figure 6 is Figure 5 a schematic curve diagram between the voltage frequency and the loop current in;

[0048] Figure 7 In the present application, according to different Ldc values substituted into Figure 5 is a schematic diagram of the curve of the variation of different loop currents with frequency obtained by simulating the circuit shown;

[0049] Figure 8 is a schematic diagram of the structure of a circulating current suppression device provided by the present application;

[0050] Figure 9 is a schematic diagram of the structure of an electronic device provided by the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0051] In an embodiment of the present application, by providing a circulating current suppression method, the technical problems in the prior art that the common DC dual-motor controller has serious heat generation and low reliability of the common DC dual-motor controller are solved.

[0052] The technical solution of the embodiment of the present application to solve the above technical problems is generally as follows:

[0053] A circulating current suppression method, the method includes: determining an equivalent circuit model according to the circuit structure of the common DC dual-motor controller to be optimized; determining a target loop from the equivalent circuit model according to the impedance distribution in the equivalent circuit model; determining a target device to be optimized and the target parameter value of the target device in the target loop according to the resonance frequency change law and / or the ripple current frequency change law of the target loop; optimizing the target device according to the target parameter value to suppress the circulating current of the target loop.

[0054] In an embodiment of the present application, according to the impedance distribution in the equivalent circuit model of the common DC dual-motor controller, the target loop to be optimized is determined. According to the resonance frequency change law and / or the ripple current frequency change law in the target loop, the target device to be optimized can be determined, and then the target device is optimized to suppress the circulating current in the target loop. It can be seen that the embodiment of the present application can be used for basically all types of common DC dual-motor controllers, can provide a solution direction for suppressing the circulating current, thus reducing the process of repeated rectification in the test stage, reducing the test cost, and shortening the test cycle.

[0055] To better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0056] First, it should be noted that the term "and / or" appearing in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the front and rear associated objects.

[0057] A single-motor controller usually includes: a DC input interface, a DC bus capacitor, an inverter, and a three-phase current output interface. For details, please refer to Figure 1 . The DC input interface introduces the direct current of the battery into the motor controller. After the DC bus capacitor connected in parallel at both ends of the DC input interface and both ends of the inverter is charged, it will provide a stable battery voltage for the inverter, and at the same time, it can filter out the harmonic components in the direct current. After the inverter converts the direct current into three-phase alternating current, it is transmitted to the motor through the three-phase interface to realize a complete control loop.

[0058] In a dual-motor controller, two sets of components and circuits of a single-motor controller are required. To save costs, the DC input interfaces of the two sets of single-motor controllers are usually designed in a combined manner, sharing the same DC input interface, resulting in a common-DC dual-motor controller as shown in Figure 2 . This can reduce the cost of one set of external DC cables and one set of connectors, and can effectively optimize the in-vehicle layout space.

[0059] However, in actual use, the common-DC dual-motor controller generates severe heat, resulting in low reliability. In order to analyze the heat generation reason of the common-DC dual-motor controller, the inventor of this application has conducted a series of researches and tests on this, and finally determined the heat generation reason, which is as follows:

[0060] There are high-frequency switches inside the inverter. When switching, it will cause high-frequency changes in the DC voltage. The voltage of the bus capacitor will also change following this high-frequency change. At the same time, the voltage of the bus capacitor in another set of control units will also show high-frequency changes, ultimately resulting in a voltage difference between the two bus capacitors.

[0061] Since the voltage changes of the two bus capacitors will inevitably lead to the charging and discharging of the bus capacitors, high-frequency charging and discharging will occur between the two bus capacitors, forming a ripple voltage and a ripple current. In addition, the impedance inside the loop formed by the bus capacitor, the copper bar (the device that conducts current in the controller), and the DC input interface includes a capacitance component, a resistance component, and an inductance component. The existence of the impedance leads to the possibility of resonance in the loop.

[0062] When the charging and discharging frequency of the bus capacitor coincides with the inherent resonance frequency of the loop, resonance will occur, amplifying the ripple current. Coupled with the fact that the internal circuits of the controller are all connected through copper bars, the value of its resistance component is very small. The high-frequency voltage change forms a high-amplitude loop current between the two bus capacitor loops. This loop current is much larger than the design value of the controller, and then it will generate huge heat on the copper bar and the bus capacitor, resulting in severe heat generation of the common-DC dual-motor controller, and may even damage the common-DC dual-motor controller.

[0063] Based on the above reasons for the heat generation of the common-DC dual-motor controller, the inventor provides a circulating current suppression method as shown in Figure 3 . The method includes steps S31 - S34.

[0064] Step S31, determine the equivalent circuit model according to the circuit structure of the common-DC dual-motor controller to be optimized;

[0065] Step S32, determine the target loop from the equivalent circuit model according to the impedance distribution in the equivalent circuit model;

[0066] Step S33: Determine the target device to be optimized and the target parameter value of the target device in the target loop according to the resonance frequency change law and / or the ripple current frequency change law of the target loop.

[0067] Step S34: Optimize the target device according to the target parameter value to suppress the circulating current in the target loop.

[0068] Regarding step S31, determine the equivalent circuit model according to the circuit structure of the co - DC dual - motor controller to be optimized.

[0069] Extract the key parameters of the key devices from the circuit structure of the co - DC dual - motor controller to be optimized for circuit model construction, and obtain the equivalent circuit model.

[0070] As Figure 4 shown, it is the equivalent circuit model obtained according to the circuit structure shown in Figure 2 . Among them, one set of motor controllers in Figure 2 is denoted as motor controller 1, the corresponding bus capacitor is denoted as bus capacitor 1, the inverter is denoted as inverter 1, the other set of motor controllers is denoted as motor controller 2, the corresponding bus capacitor is denoted as bus capacitor 2, and the inverter is denoted as inverter 2.

[0071] As Figure 4 shown, the bus capacitor 1 of motor controller 1 can be decomposed according to impedance into: inductance component Lc1, resistance component Rc1, and capacitance component C1; the bus capacitor 2 of motor controller 2 can be decomposed according to impedance into: inductance component Lc2, resistance component Rc1, and capacitance component C2; the common - DC input interface can be decomposed according to impedance into: DC voltage source battery, resistance component Rb, and inductance component Lb. MCU1 is the remaining circuit part of motor controller 1, and MCU2 is the remaining circuit part of motor controller 2. MCU1, Lc1, Rc1, and C1 form a motor controller 1; MCU2, Lc2, Rc2, and C2 form a motor controller 2; Rb, battery, and Lb form the DC input interface of the dual - motor controller. Motor controller 1, motor controller 2, and the DC input interface of the dual - motor controller form the co - DC dual - motor controller assembly.

[0072] Regarding step S32, determine the target loop from the equivalent circuit model according to the impedance distribution in the equivalent circuit model.

[0073] When designing the co - DC dual - motor controller, the design flow direction of the co - DC dual - motor controller, that is, the ideal current flow direction, is usually considered. However, when the co - DC dual - motor controller is actually operating, there are still differences between the actual current flow direction and the ideal current flow direction.

[0074] According to the impedance distribution in the equivalent circuit model, the actual current flow in the equivalent circuit model can be determined. Based on the difference between the ideal current flow and the actual current flow in the equivalent circuit model, the target loop can be determined from the equivalent circuit model. The target loop refers to the current loop other than the design.

[0075] As Figure 2 and Figure 4 shown, due to the existence of high-frequency switches inside the inverter, high-frequency changes in the DC voltage will be caused during switching, and the voltage of the bus capacitor will also change following this high-frequency change. Ideally, the current generated by the charging and discharging of the voltage change of the C1 bus capacitor should flow in loop 1 composed of Lc1, Rc1, C1, Lb, battery, and Rb, and the current generated by the charging and discharging of the voltage change of the C2 bus capacitor should flow in loop 2 composed of Lc2, Rc2, C2, Lb, battery, and Rb.

[0076] However, due to the existence of connectors and long DC cables in the actual DC loop, the impedance of the Rb, battery, and Lb parts will be greater than the impedance values of Lc2, Rc2, C2 and Lc1, Rc1, C1. Therefore, the charging and discharging current will actually be generated in loop 3 composed of Lc1, Rc1, C1, C2, Rc2, and Lc2. This part of the current is not within the design and will resonate in loop 3. So, loop 3 is taken as the target loop.

[0077] In addition, due to the existence of the resistance Rdc and inductance Ldc of the copper bar in the real loop, they need to be added to loop 3 for calculation. Therefore, the voltage difference of the bus capacitor can be equivalent to the voltage source V, and then the equivalent circuit model as Figure 5 shown can be obtained, which can be recorded as loop 4 composed of Lc1, Rc1, C1, C2, Rc2, Lc2, Rdc, Ldc, and V.

[0078] Regarding step S33, according to the resonance frequency change law and / or the ripple current frequency change law of the target loop, the target device to be optimized and the target parameter value of the target device in the target loop are determined.

[0079] Refer to Figure 5 , the calculation formula of the resonance frequency in the target loop is shown as the following formula (1):

[0080]

[0081] where f is the resonance frequency, C1 is the capacitance component of the equivalent capacitor C1, C2 is the capacitance component of the equivalent capacitor C2, L c1 is the inductance component of the equivalent inductor Lc1, L c2 is the inductance component of the equivalent inductor Lc2, L dcIt is the inductance component of the equivalent inductance Ldc.

[0082] The ripple current frequency f1 is related to the inverter switching frequency f of the motor controller 1 M1 and the inverter switching frequency f of the motor controller 2 M2 and the calculation method is shown in Equation (2).

[0083] f1≈f M1 +f M2 (2)

[0084] For Figure 5 the loop 4 shown in the figure, circuit simulation is carried out, and the curve graph of the current in the loop changing with the frequency of the voltage source V is obtained, as shown in Figure 6 the figure. It can be seen that when the frequency of the voltage source V is equal to f0, the loop resonates and the current reaches the peak value. When the controller is operating normally, the frequency of the voltage source V is equal to f1. At this time, f1 will be near the resonance frequency f0. Although the loop current A1 (i.e., the current corresponding to f1) does not reach the peak value, it far exceeds the preset ripple current value As. It can be seen from the figure that when f1 is far from f0, the current will become smaller.

[0085] Therefore, the circulating current can be adjusted in two directions: adjusting the resonance frequency and adjusting the ripple current frequency.

[0086]

Adjusting the ripple current frequency

[0087] According to the change rule of the ripple current frequency of the target loop, determine the second parameter set related to the ripple current frequency of the target loop; according to the adjustment difficulty of the circuit devices corresponding to the parameters in the second parameter set, determine the target device and the target parameter value to be optimized from the circuit devices corresponding to the parameters in the second parameter set.

[0088] According to the change rule of the ripple current frequency (such as Equation (2)), the second parameter set related to the ripple current frequency can be determined, including the inverter 1 switching frequency f of the motor controller 1 M1 and the inverter 2 switching frequency f of the motor controller M2 .

[0089] According to the adjustment difficulty of the switching frequencies of the inverter 1 and the inverter 2, one of the devices can be selected as the target device and the corresponding switching frequency value can be determined.

[0090] In actual operation, the inverter switching frequency f M1 or f M2 is controlled by the software program. If it is necessary to adjust f M1 and / or f M2 , it can be achieved by modifying the software program.

[0091]

Adjusting the resonance frequency

[0092] Determine a first parameter set related to the resonance frequency of the target circuit according to the variation law of the resonance frequency of the target circuit; determine the target device to be optimized and the target parameter value from the circuit devices corresponding to the parameters in the first parameter set according to the adjustment difficulty of the circuit devices corresponding to each parameter in the first parameter set.

[0093] According to the parameter values of each equivalent device in the target circuit, the resonance frequency in the target circuit can be determined. Then, the parameters of each equivalent device directly affect the resonance frequency of the target circuit. Furthermore, according to the relationship between each equivalent device and the resonance frequency, the variation law of the resonance frequency can be determined.

[0094] It can be seen from the above formula (1) that the first parameter set related to the resonance frequency of the target circuit may include the capacitance component C1, the capacitance component C2, the inductance component L c1 、the inductance component L c2 、the inductance component L dc , and the corresponding circuit devices include the bus capacitor C1, the bus capacitor C2, and the copper bar.

[0095] Generally, compared with the adjustment difficulty of the capacitance component, the adjustment difficulty of the inductance component is smaller, and the inductance component of the copper bar is easier to adjust than the inductance component of the bus capacitor. Therefore, the copper bar can be used as the target device.

[0096] After determining the target device, the target parameter value corresponding to the target device can be further determined, including:

[0097] Obtain the first correlation relationship between the parameter value of the target device, the resonance frequency of the target circuit, and the loop current of the target circuit; determine the target parameter value according to the first correlation relationship and the preset ripple current value of the target circuit.

[0098] If the inductance component of the copper bar is taken as the adjustment object, then L in the above formula (1) dc is used as a variable to obtain the corresponding f, and then the current relationship between f and the current in loop 4 is determined. As Figure 6 shown, it is the frequency response curve between the resonance frequency and the loop current of the target circuit, that is, the first correlation relationship. Among them, the frequency corresponding to the maximum current value in the curve is the highest resonance frequency f0, and when the frequency f1 remains unchanged, it is necessary to make f0 far away from f1. Therefore, f0 needs to be adjusted.

[0099] As Figure 7 shown, different Ldc values are substituted into the circuit of loop 4 for simulation, and the variation curve of different loop currents with frequency is obtained. From Figure 7Find the inductance value Ldc of f1 in which the corresponding current value is less than the preset ripple current value As. This Ldc value is the inductance value that the DC bus loop needs to achieve (i.e., the target parameter value), and this value is used as the design input value of the DC bus.

[0100] For the above two adjustment directions, this embodiment also provides the following optimization scheme to select a more appropriate adjustment direction from the two adjustment directions to suppress the circulating current in the target loop, specifically including steps S41 - S43.

[0101] Step S41: Determine the first alternative device according to the resonance frequency change law of the target loop.

[0102] Step S41 is the same as the above method of

Adjusting the resonance frequency

[0103] Step S42: Determine the second alternative device according to the ripple current frequency change law of the target loop.

[0104] Step S42 is the same as the above method of

Adjusting the ripple current frequency

[0105] Step S43: Select a device from the first alternative device and the second alternative device as the target device according to the adjustment difficulty of the first alternative device and the second alternative device, and determine the target parameter value corresponding to the target device.

[0106] That is to say, the first alternative device can be a bus bar, and the second alternative device can be an inverter. Select the device with less adjustment difficulty from the bus bar and the inverter as the target device, and determine the target parameter value corresponding to the target device.

[0107] Regarding step S34, optimize the target device according to the target parameter value to suppress the circulating current in the target loop.

[0108] For example, if the bus bar is used as the target device, then the bus bar with the target parameter value needs to be used as the bus bar in the common DC dual - motor controller to suppress the circulating current in the common DC dual - motor controller, reduce the heat generation, and improve the reliability of the common DC dual - motor controller.

[0109] In addition, the solution provided in this embodiment is not only applicable to Figure 2 the shown common DC dual - motor controller, but also applicable to other forms of common DC dual - motor controllers, which will not be elaborated in this embodiment.

[0110] In summary, in this embodiment, the target loop to be optimized is determined based on the impedance distribution in the equivalent circuit model of the common DC dual-motor controller. According to the variation law of the resonance frequency and / or the variation law of the ripple current frequency in the target loop, the target device to be optimized can be determined, and then the target device is optimized to suppress the circulating current in the target loop. It can be seen that this embodiment can be used for basically all types of common DC dual-motor controllers, which can provide a solution direction for suppressing the circulating current, thus reducing the process of repeated rectification in the test stage, reducing the test cost, and shortening the test cycle. In addition, the suppression of the loop current can be achieved through relatively small structural changes, which not only simplifies the rectification difficulty, reduces the rectification cost, but also reduces the high thermal load caused by the loop current.

[0111] Based on the same inventive concept, this embodiment provides a Figure 8 circulating current suppression device as shown in

[0112] The equivalent circuit model determination module 81 is configured to determine an equivalent circuit model according to the circuit structure of the common DC dual-motor controller to be optimized;

[0113] The target loop determination module 82 is configured to determine a target loop from the equivalent circuit model according to the impedance distribution in the equivalent circuit model;

[0114] The target device determination module 83 is configured to determine the target device to be optimized and the target parameter value of the target device in the target loop according to the variation law of the resonance frequency and / or the variation law of the ripple current frequency of the target loop;

[0115] The optimization module 84 is configured to optimize the target device according to the target parameter value to suppress the circulating current in the target loop.

[0116] Further, the target loop determination module 82 includes:

[0117] The actual current flow direction determination sub-module is configured to determine the actual current flow direction in the equivalent circuit model according to the impedance distribution in the equivalent circuit model;

[0118] The target loop determination sub-module is configured to determine a target loop from the equivalent circuit model according to the ideal current flow direction and the actual current flow direction of the equivalent circuit model.

[0119] Further, the target device determination module 83 includes:

[0120] The first parameter set determination sub-module is configured to determine a first parameter set related to the resonance frequency of the target loop according to the variation law of the resonance frequency of the target loop;

[0121] A target device determination sub-module, configured to determine a target device to be optimized and a target parameter value from the circuit devices corresponding to the parameters in the first parameter set according to the adjustment difficulty of the circuit devices corresponding to the parameters in the first parameter set.

[0122] Further, the target device determination sub-module includes:

[0123] A target parameter value determination sub-module, configured to:

[0124] Obtain a first correlation relationship between the parameter value of the target device, the resonant frequency of the target loop, and the loop current of the target loop;

[0125] Determine the target parameter value according to the first correlation relationship and the preset ripple current value of the target loop.

[0126] Further, the target device determination module 83 includes:

[0127] A second parameter set determination sub-module, configured to determine a second parameter set related to the ripple current frequency of the target loop according to the variation law of the ripple current frequency of the target loop;

[0128] A target device determination sub-module, configured to determine a target device to be optimized and a target parameter value from the circuit devices corresponding to the parameters in the second parameter set according to the adjustment difficulty of the circuit devices corresponding to the parameters in the second parameter set.

[0129] Further, the target device determination module 83 includes:

[0130] A first alternative device determination sub-module, configured to determine a first alternative device according to the variation law of the resonant frequency of the target loop;

[0131] A second alternative device determination sub-module, configured to determine a second alternative device according to the variation law of the ripple current frequency of the target loop;

[0132] A target device determination sub-module, configured to select one device from the first alternative device and the second alternative device as the target device according to the adjustment difficulty of the first alternative device and the second alternative device, and determine the target parameter value corresponding to the target device.

[0133] Based on the same inventive concept, this embodiment provides an electronic device as shown in Figure 9 and includes:

[0134] A processor;

[0135] A memory for storing instructions executable by the processor;

[0136] Wherein, the processor is configured to execute to implement a current circulation suppression method as provided above.

[0137] Based on the same inventive concept, this embodiment provides a non-transitory computer-readable storage medium. When the instructions in the storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute a circulation suppression method as provided above.

[0138] Since the electronic device introduced in this embodiment is the electronic device used to implement the information processing method in the embodiments of the present application, based on the information processing method introduced in the embodiments of the present application, those skilled in the art can understand the specific implementation manners and various variations of the electronic device in this embodiment. Therefore, the specific implementation of how this electronic device implements the method in the embodiments of the present application will not be described in detail here. As long as the electronic device used by those skilled in the art to implement the information processing method in the embodiments of the present application belongs to the scope protected by the present application.

[0139] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0140] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0141] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implements the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0142] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus, so that a series of operation steps are performed on the computer or other programmable apparatus to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable apparatus provide steps for implementing the functions specified in one process or a plurality of processes and / or blocks. Figure 1 one process or a plurality of processes and / or blocks Figure 1 or steps for implementing the functions specified in one block or a plurality of blocks.

[0143] Although the preferred embodiments of the present invention have been described, additional changes and modifications can be made by those skilled in the art once they learn of the basic creative concept. Therefore, the appended claims are intended to be construed to cover the preferred embodiments as well as all changes and modifications that fall within the scope of the present invention.

[0144] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A method for suppressing circulation, characterized in that, The method includes: Determining an equivalent circuit model according to the circuit structure of the common DC dual-motor controller to be optimized; Determining a target loop from the equivalent circuit model according to the impedance distribution in the equivalent circuit model; the target loop refers to the current loop other than the designed one; Determining a target device to be optimized and a target parameter value of the target device in the target loop according to the resonance frequency change law and / or the ripple current frequency change law of the target loop; Optimizing the target device according to the target parameter value to suppress the circulating current in the target loop; The determining the target device to be optimized and the target parameter value of the target device in the target loop according to the resonance frequency change law of the target loop includes: Determining a first parameter set related to the resonance frequency of the target loop according to the resonance frequency change law of the target loop; Determining the target device to be optimized and the target parameter value from the circuit devices corresponding to the parameters in the first parameter set according to the adjustment difficulty of the circuit devices corresponding to the parameters in the first parameter set.

2. The method according to claim 1, wherein The determining the target loop from the equivalent circuit model according to the impedance distribution in the equivalent circuit model includes: Determining the actual current flow direction in the equivalent circuit model according to the impedance distribution in the equivalent circuit model; Determining the target loop from the equivalent circuit model according to the ideal current flow direction and the actual current flow direction of the equivalent circuit model.

3. The method according to claim 1, characterized in that Determining the target parameter value includes: Obtaining a first correlation relationship among the parameter value of the target device, the resonance frequency of the target loop, and the loop current of the target loop; Determining the target parameter value according to the first correlation relationship and the preset ripple current value of the target loop.

4. The method according to claim 1, characterized in that, The determining the target device to be optimized and the target parameter value of the target device in the target loop according to the ripple current frequency change law of the target loop includes: Determining a second parameter set related to the ripple current frequency of the target loop according to the ripple current frequency change law of the target loop; Determining the target device to be optimized and the target parameter value from the circuit devices corresponding to the parameters in the second parameter set according to the adjustment difficulty of the circuit devices corresponding to the parameters in the second parameter set.

5. The method according to claim 1, characterized in that The determining the target device to be optimized and the target parameter value of the target device in the target loop according to the resonance frequency change law and the ripple current frequency change law of the target loop includes: Determining a first alternative device according to the resonance frequency change law of the target loop; Determining a second alternative device according to the ripple current frequency change law of the target loop; Selecting one device from the first alternative device and the second alternative device as the target device according to the adjustment difficulty of the first alternative device and the second alternative device, and determining the target parameter value corresponding to the target device.

6. A circulation suppression device, characterized in that, The device includes: An equivalent circuit model determining module, configured to determine an equivalent circuit model according to the circuit structure of the common DC dual-motor controller to be optimized; A target loop determination module, configured to determine a target loop from the equivalent circuit model according to the impedance distribution in the equivalent circuit model; the target loop refers to a current loop other than the design. A target device determination module, configured to determine a target device to be optimized and a target parameter value of the target device in the target loop according to the resonance frequency change rule and / or the ripple current frequency change rule of the target loop. An optimization module, configured to optimize the target device according to the target parameter value to suppress the circulating current of the target loop. The target device determination module includes: A first parameter set determination sub-module, configured to determine a first parameter set related to the resonance frequency of the target loop according to the resonance frequency change rule of the target loop. A target device determination sub-module, configured to determine a target device to be optimized and a target parameter value from the circuit devices corresponding to the parameters in the first parameter set according to the adjustment difficulty of the circuit devices corresponding to the parameters in the first parameter set.

7. The device according to claim 6, characterized in that, The target loop determination module includes: An actual current flow direction determination sub-module, configured to determine the actual current flow direction in the equivalent circuit model according to the impedance distribution in the equivalent circuit model. A target loop determination sub-module, configured to determine the target loop from the equivalent circuit model according to the ideal current flow direction and the actual current flow direction of the equivalent circuit model.

8. An electronic device, characterized in that, Includes: A processor; A memory for storing instructions executable by the processor; Wherein, the processor is configured to execute to implement a circulating current suppression method according to any one of claims 1 to 5.

9. A non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by a processor of an electronic device, enabling the electronic device to execute and implement a circulating current suppression method according to any one of claims 1 to 5.

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