Resonance suppression method, whole vehicle high-voltage system and all-in-one equipment

Abstract

The invention discloses a resonance suppression method, a whole vehicle high-voltage system and all-in-one equipment, and relates to the technical field of electrical equipment control, the method is used for a high-voltage direct-current bus network comprising a high-voltage power supply and a plurality of electrical equipment, and the electrical equipment comprises a switch module and a load which are connected with each other. The high-voltage power supply is respectively connected with the plurality of switch modules through a high-voltage direct-current bus; the method comprises the steps of determining idle electrical equipment in electrical equipment in a non-working state when resonance of a high-voltage direct-current bus is detected; determining a target control strategy corresponding to the idle electrical equipment in preset control strategies according to the topology type and the load type of a switch module in the idle electrical equipment; and controlling a switch module of the idle electrical equipment to execute an action according to the target control strategy so as to adjust the natural resonant frequency of the high-voltage direct-current bus. According to the invention, the resonance of the high-voltage direct-current bus is suppressed, and the robustness of the high-voltage direct-current bus and the compatibility of electrical equipment are improved.

Description

Technical Field

[0001] This application relates to the field of electrical equipment control technology, and in particular to a resonance suppression method, a vehicle high-voltage system, and an all-in-one device. Background Technology

[0002] In the high-voltage systems or all-in-one products of new energy vehicles, electrical equipment sharing a high-voltage DC bus is prone to causing high-voltage DC bus resonance during operation. Related technologies primarily suppress high-voltage DC bus resonance by adjusting the frequency of the excitation source. However, this method can easily affect the normal operation of the excitation source and electrical equipment, failing to meet the needs of different application scenarios and reducing the robustness of the excitation source. Summary of the Invention

[0003] The main purpose of this application is to provide a resonance suppression method, a vehicle high-voltage system, and an all-in-one device, aiming to solve the technical problems in the related technologies where resonance suppression methods affect the normal operation of the excitation source and electrical equipment, resulting in poor system compatibility and reduced robustness of the excitation source.

[0004] To at least achieve the above objectives, this application proposes a resonance suppression method for a high-voltage direct current (HVDC) bus network. The HVDC bus network includes a high-voltage power supply and multiple electrical devices. Each electrical device includes interconnected switching modules and loads. The high-voltage power supply is connected to the switching modules of the multiple electrical devices via the HVDC bus. The resonance suppression method includes:

[0005] When high-voltage DC bus resonance is detected, an idle electrical device is identified among the electrical devices that are not in operation.

[0006] Based on the topology and load type of the switch modules in the idle electrical equipment, the target control strategy corresponding to the idle electrical equipment is determined in the preset control strategy; wherein, the preset control strategy includes switch control strategies corresponding to different topology types and different load types;

[0007] The switching modules of idle electrical equipment are controlled to perform actions according to the target control strategy in order to adjust the inherent resonant frequency of the high-voltage DC bus.

[0008] In one embodiment, when the topology type is a three-phase bridge topology and the load type is an inductive load, the target control strategy includes a first control strategy;

[0009] According to the target control strategy, the switching modules of idle electrical equipment are controlled to perform actions to adjust the inherent resonant frequency of the high-voltage DC bus, including:

[0010] According to the first control strategy, the upper arm switch of any one phase arm circuit in the three-phase bridge topology is controlled to be chopped, and any one of the lower arm switches of the other two phase arm circuits in the three-phase bridge topology is controlled to be turned on, so as to form the first equivalent circuit.

[0011] The impedance characteristics of the high-voltage DC bus are adjusted by connecting the first equivalent circuit in parallel to the high-voltage DC bus, thereby adjusting the inherent resonant frequency of the high-voltage DC bus.

[0012] In one embodiment, when the topology type is a three-phase bridge topology and the load type is an inductive load, the target control strategy includes a second control strategy;

[0013] According to the target control strategy, the switching modules of idle electrical equipment are controlled to perform actions to adjust the inherent resonant frequency of the high-voltage DC bus, including:

[0014] According to the second control strategy, the upper arm switch of any one phase bridge arm circuit in the three-phase bridge topology is controlled to be chopped, and the lower arm switches of the other two phase bridge arm circuits in the three-phase bridge topology are controlled to be turned on simultaneously to form the second equivalent circuit.

[0015] The impedance characteristics of the high-voltage DC bus are adjusted by connecting the second equivalent circuit in parallel to the high-voltage DC bus, thereby adjusting the inherent resonant frequency of the high-voltage DC bus.

[0016] In one embodiment, when the topology type is a three-phase bridge topology and the load type is an inductive load, the target control strategy includes a third control strategy;

[0017] According to the target control strategy, the switching modules of idle electrical equipment are controlled to perform actions to adjust the inherent resonant frequency of the high-voltage DC bus, including:

[0018] According to the third control strategy, the upper arm switch of any one phase bridge arm circuit in the three-phase bridge topology is chopped, and the lower arm switch of any one phase bridge arm circuit is turned on to form a bridge arm through circuit.

[0019] The impedance characteristics of the high-voltage DC bus are adjusted by connecting the bridge arm through circuit in parallel to the high-voltage DC bus, thereby adjusting the inherent resonant frequency of the high-voltage DC bus.

[0020] In one embodiment, when the topology type is a full-bridge switch topology and the load type is a capacitive load and / or an inductive load, the target control strategy includes a fourth control strategy;

[0021] According to the target control strategy, the switching modules of idle electrical equipment are controlled to perform actions to adjust the inherent resonant frequency of the high-voltage DC bus, including:

[0022] According to the fourth control strategy, the upper arm switch of any phase arm circuit in the full-bridge switch topology is controlled to be chopped, and the lower arm switch of another phase arm circuit in the full-bridge switch topology is controlled to be turned on, so as to form a first access circuit; the first access circuit includes a capacitive load, an inductive load, or a series capacitive load and an inductive load.

[0023] The impedance characteristics of the high-voltage DC bus are adjusted by connecting the first access circuit in parallel to the high-voltage DC bus, thereby adjusting the inherent resonant frequency of the high-voltage DC bus.

[0024] In one embodiment, when the topology type is a relay and the load type is a charging box, the target control strategy includes a fifth control strategy;

[0025] According to the target control strategy, the switching modules of idle electrical equipment are controlled to perform actions to adjust the inherent resonant frequency of the high-voltage DC bus, including:

[0026] According to the fifth control strategy, the control relay is closed to form a second access circuit; the second access circuit includes a charging box with an internal relay connected, and the charging box includes a boost charging box or a boost current charging box.

[0027] The impedance characteristics of the high-voltage DC bus are adjusted by connecting the second access circuit in parallel to the high-voltage DC bus, thereby adjusting the inherent resonant frequency of the high-voltage DC bus.

[0028] In one embodiment, when the topology type is a controllable switch and the load type is a resistive load, the target control strategy includes a sixth control strategy;

[0029] According to the target control strategy, the switching modules of idle electrical equipment are controlled to perform actions to adjust the inherent resonant frequency of the high-voltage DC bus, including:

[0030] According to the sixth control strategy, the controllable switch is turned on to form a third access circuit; the third access circuit includes a resistive load.

[0031] The quality factor of the high-voltage DC bus network is adjusted by connecting a third access circuit in parallel to the high-voltage DC bus, thereby adjusting the inherent resonant frequency of the high-voltage DC bus.

[0032] In one embodiment, before the step of identifying an idle electrical device among the non-operating electrical devices when high-voltage DC bus resonance is detected, the resonance suppression method further includes:

[0033] The switching carrier frequency, operating frequency, and carrier frequency harmonic noise of the electrical equipment in operation are obtained, as well as the inherent resonant frequency of the high-voltage DC bus. The inherent resonant frequency is the inherent frequency of the equivalent circuit formed by the impedance of all electrical equipment in operation and the impedance of the high-voltage power supply.

[0034] The inherent resonant frequency is compared with the switching carrier frequency, the operating frequency, and the carrier frequency harmonic noise, respectively.

[0035] If the inherent resonant frequency is equal to the switch carrier frequency, operating frequency, or carrier frequency harmonic noise, it is determined that a high-voltage DC bus resonance has been detected.

[0036] In addition, to at least achieve the above objectives, this application also proposes a vehicle high-voltage system, comprising:

[0037] A high-voltage direct current (HVDC) bus network includes a high-voltage power supply and multiple electrical devices. The electrical devices include interconnected switch modules and loads. The high-voltage power supply is connected to the switch modules of the multiple electrical devices through the high-voltage direct current bus.

[0038] The vehicle controller is connected to multiple electrical devices to implement the resonance suppression method described above.

[0039] In addition, to at least achieve the above objectives, this application also proposes an all-in-one device, comprising:

[0040] A high-voltage direct current (HVDC) bus network includes a high-voltage power supply and multiple electrical devices. The electrical devices include interconnected switch modules and loads. The high-voltage power supply is connected to the switch modules of the multiple electrical devices through the high-voltage direct current bus.

[0041] At least one microprocessor, each microprocessor being connected to multiple electrical devices, to implement the steps of the resonance suppression method described above.

[0042] One or more technical solutions proposed in this application have at least the following technical effects:

[0043] A resonance suppression method is proposed for a high-voltage DC bus network comprising a high-voltage power supply and multiple electrical devices. The electrical devices include interconnected switching modules and loads. The high-voltage power supply is connected to multiple switching modules via the high-voltage DC bus. When resonance is detected on the high-voltage DC bus, an idle electrical device is identified among the non-operating devices. Based on the topology and load type of the switching module in the idle device, a corresponding target control strategy is determined from a preset control strategy. Then, according to the target control strategy, the switching module of the idle device is controlled to perform an action to connect the load to the high-voltage DC bus, utilizing the impedance characteristics of the load to mitigate resonance. The resonant network impedance characteristics of the high-voltage DC bus are analyzed to adjust the inherent resonant frequency of the high-voltage DC bus and avoid the relevant frequencies of the electrical equipment, thereby suppressing the resonance of the high-voltage DC bus. In this application, resonance suppression is achieved by using the non-operating electrical equipment among multiple electrical devices on the common high-voltage DC bus, without the need for additional hardware, resulting in low cost. Moreover, it ensures that each electrical device operates in its optimal state, improving system efficiency. In addition, this method can be used to suppress the resonance of the high-voltage DC bus based on different electrical devices according to various switching control strategies, improving the robustness of the high-voltage DC bus and the compatibility of the electrical equipment. Attached Figure Description

[0044] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0045] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the connection of the high-voltage DC bus network involved in the embodiments of this application;

[0047] Figure 2 This is a schematic diagram of the equivalent circuit of the high-voltage DC bus network involved in the embodiments of this application;

[0048] Figure 3 This is a flowchart illustrating the first embodiment of the resonance suppression method of this application;

[0049] Figure 4 A schematic diagram of the equivalent circuit of the high-voltage DC bus network in the first embodiment of the second embodiment of the resonance suppression method of this application;

[0050] Figure 5This is a schematic diagram of the equivalent circuit of the high-voltage DC bus network in the second embodiment of the resonance suppression method of this application;

[0051] Figure 6 A schematic diagram of the equivalent circuit of the high-voltage DC bus network in the third embodiment of the second embodiment of the resonance suppression method of this application;

[0052] Figure 7 This is a schematic diagram of the equivalent circuit of the high-voltage DC bus network in the fourth embodiment of the second embodiment of the resonance suppression method of this application;

[0053] Figure 8 A schematic diagram of the equivalent circuit of the high-voltage DC bus network in the fifth embodiment of the second embodiment of the resonance suppression method of this application;

[0054] Figure 9 A schematic diagram of the equivalent circuit of the high-voltage DC bus network in the sixth embodiment of the second embodiment of the resonance suppression method of this application;

[0055] Figure 10 This is a schematic diagram of the communication network provided in the embodiment of the vehicle high-voltage system of this application;

[0056] Figure 11 This is a schematic diagram of the communication network provided for an embodiment of the all-in-one device of this application.

[0057] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0058] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0059] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0060] In the high-voltage system or all-in-one product of new energy vehicles, there are numerous controllable electrical devices, which are connected in parallel with the battery pack, and multiple devices share a high-voltage DC bus. Since the functions of the electrical devices are different, not all devices need to work at the same time. Therefore, the high-voltage network impedance characteristics of the vehicle's high-voltage system or all-in-one product will vary.

[0061] When the carrier frequency, operating frequency, or harmonic frequency of certain electrical equipment coincides with the natural frequency of the high-voltage network, the high-voltage DC bus will resonate, causing increased bus voltage fluctuations. This affects the stable operation of electrical equipment on the common high-voltage DC bus, potentially triggering faults or causing malfunctions. It can also lead to compatibility issues with the vehicle's electrical equipment, resulting in problems such as overvoltage faults, vehicle vibration, and electrical insulation failure. In severe cases, it can even damage the entire vehicle's electrical system, affecting vehicle operation and safety.

[0062] Among related technologies, methods for suppressing high-voltage DC bus resonance include:

[0063] 1. Adjusting the operating carrier frequency or operating frequency of the excitation source to avoid the inherent frequency of the high-voltage DC bus; however, in this method, adjusting the operating frequency or switching frequency of the excitation source may cause the excitation source and electrical equipment to be unable to work in the optimal efficiency state, that is, it may easily affect the normal operation of the electrical equipment, thus failing to meet the needs of different application scenarios. Moreover, adjusting the operating frequency or switching frequency of the excitation source will cause it to only work under specific operating conditions, thereby reducing the robustness of the excitation source.

[0064] 2. Adding filters or the vehicle's high-voltage system to the excitation source or high-voltage DC bus can reduce the amplitude of the excitation source, but this method will increase equipment costs.

[0065] 3. The inherent frequency can be changed by altering the electrical architecture, cable length, cable arrangement, or impedance characteristics of other equipment input ports of the high-voltage DC bus to avoid synchronization with the frequency of the excitation source, but this method will increase the system cost.

[0066] To address the aforementioned problems, this application provides a resonance suppression method, a vehicle high-voltage system, and an all-in-one device. The resonance suppression method provided in this application utilizes the non-operating electrical equipment among multiple electrical devices on a common high-voltage DC bus to achieve resonance suppression. This eliminates the need for additional hardware, resulting in low cost. Furthermore, it ensures that each electrical device operates in its optimal state, improving system efficiency. Additionally, this method can accommodate various switching control strategies to achieve high-voltage DC bus resonance suppression based on different electrical devices, enhancing the robustness of the high-voltage DC bus and the compatibility of the electrical devices.

[0067] In a first embodiment of the resonance suppression method of this application, the resonance suppression method is used in a high-voltage DC bus network.

[0068] Reference Figure 1 , Figure 1This is a connection diagram of a high-voltage direct current (HVDC) bus network. The HVDC bus network includes a high-voltage power supply and multiple electrical devices. The electrical devices include interconnected switch modules and loads. The high-voltage power supply is connected to the switch modules of the multiple electrical devices through the high-voltage direct current bus.

[0069] It should be noted that the high-voltage DC bus network can be installed on the new energy vehicle or in an all-in-one device. Specifically, it can include multiple electrical devices sharing a high-voltage DC bus and a high-voltage power supply (HV) to supply power to these electrical devices. These electrical devices can be various types, such as front motor drivers, rear motor drivers, electric air conditioning systems, generator systems, voltage conversion systems (e.g., DC-DC converters), OBC (On-Board Charger) systems, fast charging systems (e.g., boost charging systems, boost current charging systems), and PTC (Positive Temperature Coefficient) thermistors.

[0070] like Figure 1 As shown, based on the overall vehicle high-voltage electrical architecture design, all electrical equipment is connected in parallel with respect to the high-voltage power supply. The cables between each electrical device and the high-voltage power supply can be represented by equivalent inductance, such as... Figure 1 L1, L2…Ln-1, and Ln are assigned one-to-one correspondences to n (n≥2) electrical devices; each electrical device has a bus filter capacitor at its high-voltage input port, such as… Figure 1 C1, C2...Cn-1, and Cn are assigned one-to-one correspondences with n electrical devices. In this high-voltage direct current bus network, each electrical device has switching characteristics and carries different types of loads, such as... Figure 1 Electrical equipment n has an inductive load, and electrical equipment n-1 has a resistive load.

[0071] Reference Figure 1 and Figure 2 ,based on Figure 1 High-voltage DC bus network, Figure 2 This is a schematic diagram of the equivalent circuit of the high-voltage DC bus network. The connection relationship between the bus filter capacitors of each electrical device and the cables of each electrical device can be represented by the equivalent resistance, such as... Figure 2 R1, R2...Rn-1, and Rn correspond one-to-one with n electrical devices. For each electrical device, in addition to the equivalent circuit of the cable and bus filter capacitor constituted by the equivalent inductance, bus filter capacitor, and equivalent resistance mentioned above, it may also include a switching module and a load. The types of switching modules and loads can be various, and can be configured as needed in practical applications; no limitation is made here. Taking electrical device 1 as an example, assuming that electrical device 1 is an ECU (Electronic Control Unit) in a certain system, such as... Figure 2The ECU1 shown has an equivalent circuit of cables and bus filter capacitors connected in series, consisting of L1, C1, and R1. This equivalent circuit is connected in parallel with the interconnected switching module and load. In the ECU1, the switching module is a three-phase bridge switching circuit, including switching devices S1-S6. The load is a three-phase winding motor, including U-phase winding L1U, V-phase winding L1V, and W-phase winding L1W.

[0072] Since it's generally not the case that all electrical devices operate simultaneously, let's assume that electrical device n is an ECU (Electronic Control Unit) in a system (e.g., ...). Figure 2 As shown in the diagram (ECUn), and only when this electrical device n is working, the operation of ECUn will generate internal noise, such as... Figure 2 The noise source NS shown will resonate with the high-voltage DC bus when the noise frequency of the electrical equipment n (ECUn) during operation is the same as the natural frequency of the high-voltage DC bus, thus generating noise with harmonic characteristics. Figure 2 The high-voltage DC bus noise (HV-bus Noise) shown is composed of the high-voltage power supply impedance and the cables and bus filter capacitors of the remaining n-1 electrical devices. In addition, each of the aforementioned electrical devices has switching characteristics and carries different types of loads, thus providing the conditions for changing the natural frequency of the high-voltage DC bus.

[0073] Reference Figure 3 , Figure 3 This is a flowchart illustrating the first embodiment of the resonance suppression method. The resonance suppression method provided in this embodiment may include steps S10 to S30:

[0074] Step S10: When high-voltage DC bus resonance is detected, identify an idle electrical device among the electrical devices that are not in operation.

[0075] It should be noted that this resonance suppression method can be implemented by the vehicle controller of the vehicle's high-voltage system, by control devices connected to multiple electrical devices, or by the control module of any one of the interconnected electrical devices. The specific implementation can be chosen according to actual needs and is not limited here. High-voltage DC bus resonance refers to the resonance problem caused by the operation of electrical devices in a working state among multiple electrical devices sharing a high-voltage DC bus. When there are multiple electrical devices in a non-working state, one can be randomly selected as an idle electrical device, or the idle electrical device can be determined according to preset selection rules, such as selecting an electrical device that will not affect the currently operating electrical device, or selecting an electrical device of the same type as the load within the currently operating electrical device.

[0076] Step S20: Based on the topology type and load type of the switch module in the idle electrical equipment, determine the target control strategy corresponding to the idle electrical equipment in the preset control strategy; wherein, the preset control strategy includes switch control strategies corresponding to different topology types and different load types.

[0077] It should be noted that, for different electrical equipment, if the load impedance characteristics are to be introduced into the high-voltage DC bus network, and the impedance characteristics of the high-voltage DC bus are to be adjusted by connecting it in parallel with the high-voltage DC bus to achieve the purpose of adjusting the inherent resonant frequency of the high-voltage DC bus and thus suppressing resonance, it is necessary to control the switching devices of the switching module within the electrical equipment to form different switching combinations, thereby introducing different load impedances into the high-voltage DC bus network. The preset control strategy refers to the switching control strategy set according to the topology type of the switching module and the load type within different electrical equipment.

[0078] For example, consider the aforementioned electrical devices such as the front motor driver, rear motor driver, electric air conditioning system, generator system, DC-DC system, OBC system, fast charging system, and PTC thermistor. The front motor driver, rear motor driver, and electric air conditioning system all have motor loads, which are inductive loads, and the topology of their switching modules can include a three-phase full-bridge topology. The generator system contains capacitors and transformers, providing both inductive and capacitive loads. The DC-DC system has battery loads, which are capacitive loads. The OBC system contains an AC-DC-DC converter, providing both inductive and capacitive loads. The topology of the switching modules in these three electrical devices can include a full-bridge switching topology. The fast charging system contains relays and a charging box, with an internal relay inside the charging box. The load type is the specific controlled device, i.e., the charging box, and the topology of its switching module is a relay. The PTC thermistor contains a controllable switch and a thermistor, with a resistive load. The topology of its switching module is a controllable switch. Therefore, it can be seen that switch control strategies can be set in advance for different electrical equipment to form preset control strategies. Then, in actual application, the target control strategy corresponding to the idle electrical equipment can be obtained by looking up the corresponding switch control strategy from the preset control strategies.

[0079] Step S30: Control the switching module of the idle electrical equipment to perform actions according to the target control strategy in order to adjust the inherent resonant frequency of the high voltage DC bus.

[0080] It should be noted that the actions performed include chopping, turning on, or turning off. The purpose of controlling the operation of each switching device in the switching module of the idle electrical equipment according to the target control strategy is to connect the load impedance of the idle electrical equipment to the high-voltage DC bus network, thereby adjusting the impedance characteristics of the high-voltage DC bus and adjusting its inherent resonant frequency. By suppressing resonance solely through controlling the switching state of the switching devices within the switching module, the electrical equipment on the vehicle is utilized efficiently without adding any components, thus achieving cost reduction for the entire vehicle.

[0081] In one feasible implementation, before step S10, the resonance suppression method further includes steps S01 to S03:

[0082] Step S01: Obtain the switching carrier frequency, operating frequency, and carrier frequency harmonic noise of the electrical equipment in operation, as well as the inherent resonant frequency of the high-voltage DC bus; the inherent resonant frequency is the inherent frequency of the equivalent circuit formed by the impedance of all electrical equipment in operation and the impedance of the high-voltage power supply.

[0083] Step S02: Compare the inherent resonant frequency with the switching carrier frequency, the operating frequency, and the carrier frequency harmonic noise, respectively;

[0084] Step S03: If the inherent resonant frequency is equal to the switching carrier frequency, operating frequency, or carrier frequency harmonic noise, it is determined that high-voltage DC bus resonance has been detected.

[0085] It should be noted that at a certain moment during the operation of the electrical equipment, its switching carrier frequency f is set. cn Operating frequency f on and carrier frequency harmonic noise f cnk The natural frequency of the equivalent circuit formed by the impedance of inactive electrical equipment and high-voltage power supply on the high-voltage DC bus network is f. n-1 The inherent frequency f n-1 respectively with the switching carrier frequency f cn Operating frequency f on and carrier frequency harmonic noise f cnk Compare, if f n-1 =f on f n-1 =f cn or f n-1 =f cnk If this is detected, it indicates that the high-voltage DC bus is resonating, meaning that high-voltage DC bus resonance has been detected, and step S10 can be initiated. After executing steps S10-S30, the load impedance of the idle electrical equipment can be connected in parallel with the high-voltage DC bus, thereby changing the impedance characteristics of the high-voltage DC bus, and its inherent resonant frequency becomes f'. n-1 At this time, f' n-1 with f on fcn or f cnk If none of them are equal, then the resonance is suppressed.

[0086] It should also be noted that if the inherent resonant frequency is not equal to the switching carrier frequency, the operating frequency, and the carrier frequency harmonic noise, it means that there is no high-voltage DC bus resonance at present, and there is no need to suppress resonance. In this case, no response can be made, or the process can return to step S01 to perform resonance detection at subsequent times, and then proceed with the subsequent steps according to the detection results.

[0087] This embodiment provides a resonance suppression method for a high-voltage DC bus network comprising a high-voltage power supply and multiple electrical devices. The electrical devices include interconnected switching modules and loads. The high-voltage power supply is connected to multiple switching modules via the high-voltage DC bus. When resonance is detected on the high-voltage DC bus, an idle electrical device is identified among the non-operating devices. Based on the topology and load type of the switching module in the idle device, a corresponding target control strategy is determined from a preset control strategy. Then, according to the target control strategy, the switching module of the idle device is controlled to perform an action to connect the load to the high-voltage DC bus, utilizing the impedance characteristics of the load to suppress resonance. Improving the impedance characteristics of the resonant network of the high-voltage DC bus, thereby adjusting the inherent resonant frequency of the high-voltage DC bus and avoiding the relevant frequencies of electrical equipment operation, achieves the purpose of suppressing high-voltage DC bus resonance. In this application, resonance suppression is achieved by utilizing the non-operating electrical equipment among multiple electrical devices on the common high-voltage DC bus, without the need for additional hardware, resulting in low cost. Moreover, it ensures that each electrical device operates in its optimal state, improving system efficiency. In addition, this method can be used to suppress high-voltage DC bus resonance based on different electrical devices according to various switching control strategies, improving the robustness of the high-voltage DC bus and the compatibility of electrical equipment.

[0088] Based on the first embodiment of the resonance suppression method of this application, in the second embodiment of the resonance suppression method of this application, the same or similar content as the above embodiment can be referred to the above description, and will not be repeated hereafter.

[0089] In the first embodiment of this example, when the topology is a three-phase bridge topology and the load type is an inductive load, the target control strategy includes a first control strategy; step S30 in the resonance suppression method may include steps S311 to S312:

[0090] Step S311: According to the first control strategy, control the upper arm switch of any one phase bridge arm circuit in the three-phase bridge topology to chop, and control any one of the lower arm switches of the other two phase bridge arm circuits in the three-phase bridge topology to conduct, so as to form the first equivalent circuit.

[0091] Step S312: Adjust the impedance characteristics of the high-voltage DC bus by connecting the first equivalent circuit in parallel to the high-voltage DC bus, so as to adjust the inherent resonant frequency of the high-voltage DC bus.

[0092] It should be noted that controlled switch chopping refers to controlling the output voltage by changing the switching frequency and duty cycle of the switching transistor. The switching frequency refers to the frequency of switching between on and off, and the duty cycle refers to the ratio of the on-time in one cycle to the total cycle time. The switching frequency and duty cycle of controlled switch chopping can be set according to actual needs and are not specifically limited here. Controlled switch conduction refers to controlling the switching transistor to remain in a conducting state for a period of time.

[0093] It should also be noted that in a three-phase bridge topology, any one phase arm circuit corresponds to a winding. When the upper arm switch of any one phase arm circuit is chopped, and any one of the lower arm switches of the other two phase arm circuits is turned on, there is a situation where the two phase windings corresponding to the two switch arm circuits are connected in series. At this time, an equivalent circuit, namely the first equivalent circuit, can be formed by connecting the two series-connected phase windings to the voltage-controlled current source. By connecting this first equivalent circuit in parallel to the high-voltage DC bus, the impedance characteristics of the high-voltage DC bus can be changed, thereby changing the inherent resonant frequency of the high-voltage DC bus. This ensures that the inherent resonant frequency is not equal to the switching carrier frequency, operating frequency, or carrier frequency harmonic noise of the electrical equipment in operation, thus achieving the effect of suppressing the resonance of the high-voltage DC bus by controlling the switching modules in the idle electrical equipment.

[0094] Reference Figure 4 , Figure 4 This is a schematic diagram of the equivalent circuit of the high-voltage DC bus network in this embodiment. In a high-voltage DC bus network, it is assumed that electrical equipment 1 to electrical equipment n all include an ECU. Electrical equipment n is working, while electrical equipment 1 is not working, and electrical equipment 1 is defined as an idle electrical equipment. At the same time, the load type of electrical equipment 1 is an inductive load, specifically a three-phase motor, represented by three parallel winding inductors L1U, L1V, and L1W. The topology type of the switching module of electrical equipment 1 is a three-phase bridge topology, specifically including switching transistors S1-S6. Among them, S1 and S2 form a phase bridge arm circuit. The upper bridge arm switch of this bridge arm circuit is S1, and the lower bridge arm switch is S2. The other two are similar, and the details are not elaborated. Furthermore, the common connection point of the upper and lower bridge arm switches of each phase bridge arm circuit is connected to a winding inductor, such as the common connection point of S1 and S2 being connected to the winding inductor L1U.

[0095] For example, the upper bridge arm switch S1 of the first phase bridge arm circuit can be choppered, and either the lower bridge arm switches S4 and S6 of the other two phase bridge arm circuits can be turned on. Here, we take the turn on of S6 as an example, forming the following... Figure 4The first equivalent circuit shown on the right side of the diagram represents the voltage-controlled current source kUdc and the equivalent inductance formed by the series connection of L1U and L1W. The first equivalent circuit formed by the series equivalent inductance 2Lm and the voltage-controlled current source kUdc will be connected in parallel to the high-voltage DC bus to adjust its inherent resonant frequency.

[0096] The resonance suppression method in this embodiment can be specifically applied to specific scenarios such as idle electrical equipment being electrical equipment with motor loads (such as front motor driver, rear motor driver, electric air conditioning system, etc.) or other electrical equipment with three-phase inverters and inductive loads. It utilizes the load characteristics of the electrical equipment that is not in operation among multiple electrical equipment on a common high-voltage DC bus, combined with specific switching control strategies to achieve resonance suppression.

[0097] In the second embodiment of this example, when the topology is a three-phase bridge topology and the load type is an inductive load, the target control strategy includes a second control strategy; step S30 in the resonance suppression method may include steps S321 to S322:

[0098] Step S321: According to the second control strategy, control the upper arm switch of any one phase bridge arm circuit in the three-phase bridge topology to chop, and control the lower arm switches of the other two phase bridge arm circuits in the three-phase bridge topology to be turned on at the same time to form the second equivalent circuit.

[0099] Step S322: Adjust the impedance characteristics of the high-voltage DC bus by connecting the second equivalent circuit in parallel to the high-voltage DC bus, so as to adjust the inherent resonant frequency of the high-voltage DC bus.

[0100] It should be noted that in a three-phase bridge topology, any one phase arm circuit corresponds to a winding. When the upper arm switch of any one phase arm circuit is chopped, and the lower arm switches of the other two phase arm circuits are simultaneously turned on, there is a situation where the two phase windings corresponding to the two lower arm switches are first connected in parallel, and then connected in series with the one phase winding corresponding to the upper arm switch. This forms an equivalent circuit, the second equivalent circuit, where the parallel two phase windings are connected in series with the third phase winding and then connected to a voltage-controlled current source. Connecting this second equivalent circuit in parallel to the high-voltage DC bus can change the impedance characteristics of the high-voltage DC bus, thereby changing its inherent resonant frequency. This achieves the effect of controlling the switching modules in the idle electrical equipment to suppress the high-voltage DC bus resonance.

[0101] Reference Figure 5 , Figure 5 This is a schematic diagram of the equivalent circuit of the high-voltage DC bus network in this embodiment; the configuration of this high-voltage DC bus network is similar to that in the first embodiment, and will not be described again here.

[0102] For example, the upper bridge arm switch S1 of the first phase bridge arm circuit can be controlled to chop, and the lower bridge arm switches S4 and S6 of the other two phase bridge arm circuits can be controlled to conduct simultaneously, forming a configuration as shown in the figure. Figure 5 The second equivalent circuit shown on the right side of the diagram represents the voltage-controlled current source kUdc and the equivalent inductance formed by the parallel L1V and L1W connected in series with L1U. The second equivalent circuit formed by the series equivalent inductance 1.5Lm and the voltage-controlled current source kUdc will be connected in parallel to the high-voltage DC bus to adjust its inherent resonant frequency.

[0103] The resonance suppression method in this embodiment can also be specifically applied to specific scenarios such as idle electrical equipment being electrical equipment with motor loads (such as front motor driver, rear motor driver, electric air conditioning system, etc.) or other electrical equipment with three-phase inverters and inductive loads. It utilizes the load characteristics of the electrical equipment that is not in operation among multiple electrical equipment on a common high-voltage DC bus, combined with specific switching control strategies to achieve resonance suppression.

[0104] In the third embodiment of this example, when the topology is a three-phase bridge topology and the load type is an inductive load, the target control strategy includes the third control strategy; step S30 in this resonance suppression method may include steps S331 to S332:

[0105] Step S331: According to the third control strategy, control the upper arm switch of any phase arm circuit in the three-phase bridge topology to chop, and control the lower arm switch of any phase arm circuit to conduct, so as to form a bridge arm through circuit.

[0106] Step S332: Adjust the impedance characteristics of the high-voltage DC bus by connecting the bridge arm through circuit in parallel to the high-voltage DC bus, thereby adjusting the inherent resonant frequency of the high-voltage DC bus.

[0107] It should be noted that in a three-phase bridge topology, when the upper arm switch of any phase bridge arm circuit is chopped, and the lower arm switch of that same phase circuit is turned on, there is a possibility that both switches in that phase bridge arm circuit can be turned on simultaneously. When the upper and lower arm switches of the same phase bridge arm circuit are turned on simultaneously, a bridge arm pass-through circuit can be formed. Connecting this pass-through circuit in parallel to the high-voltage DC bus can change the impedance characteristics of the high-voltage DC bus, thereby altering its inherent resonant frequency. This achieves the effect of controlling the switching modules in the idle electrical equipment to suppress high-voltage DC bus resonance.

[0108] Reference Figure 6 , Figure 6 This is a schematic diagram of the equivalent circuit of the high-voltage DC bus network in this embodiment; the configuration of this high-voltage DC bus network is similar to that in the first embodiment, and will not be described again here.

[0109] For example, the upper bridge arm switch S1 of the first phase bridge arm circuit can be controlled to chop, and the lower bridge arm switch S2 of the same phase bridge arm circuit can be controlled to conduct, forming a bridge arm through circuit. This bridge arm through circuit will be connected in parallel to the high voltage DC bus, and its inherent resonant frequency can be adjusted by the current change of the bridge arm through circuit.

[0110] The resonance suppression method in this embodiment can also be applied to scenarios where the idle electrical equipment is a front motor driver, a rear motor driver, an electric air conditioning system, or other electrical equipment with a three-phase inverter. It does not involve the introduction of a load. It utilizes the impedance characteristics of the electrical equipment that is not in operation among multiple electrical equipment on a common high-voltage DC bus, combined with a specific switching control strategy to achieve resonance suppression.

[0111] In the fourth embodiment of this example, when the topology is a full-bridge switching topology and the load type is a capacitive load and / or an inductive load, the target control strategy includes the fourth control strategy; step S30 in this resonance suppression method may include steps S341 to S342:

[0112] Step S341: According to the fourth control strategy, control the upper arm switch of any phase arm circuit in the full-bridge switch topology to chop, and control the lower arm switch of another phase arm circuit in the full-bridge switch topology to conduct, so as to form a first access circuit; the first access circuit includes a capacitive load, an inductive load, or a series capacitive load and an inductive load.

[0113] Step S342: Adjust the impedance characteristics of the high-voltage DC bus by connecting the first access circuit in parallel to the high-voltage DC bus, so as to adjust the inherent resonant frequency of the high-voltage DC bus.

[0114] It should be noted that when the load consists only of capacitive loads, such as capacitors, in the full-bridge switching topology, one phase arm circuit is connected to one end of the capacitor, and the other phase arm circuit is connected to the other end of the capacitor. When the upper arm switch of any one phase arm circuit is chopped and the lower arm switch of the other phase arm circuit is turned on, there is a situation where both bridge arm circuits are connected in series with the capacitor, which can correspondingly form a first access circuit that only includes capacitive loads. When the load consists only of inductive loads, such as transformers, in the full-bridge switching topology, one phase arm circuit is connected to one end of the transformer's primary winding, and the other phase arm circuit is connected to the other end of the transformer's primary winding. When the upper arm switch of any one phase arm circuit is chopped... When the lower bridge arm switch of the other phase bridge arm circuit is turned on, there is a situation where both bridge arm circuits are connected in series with the primary winding, which can correspondingly form a first access circuit that only includes inductive loads. When the load includes both capacitive and inductive loads, such as in an OBC system with a capacitor and a transformer, in the full-bridge switch topology, one phase bridge arm circuit is connected to one end of the transformer's primary winding through a capacitor, and the other phase bridge arm circuit is connected to the other end of the transformer's primary winding. When the upper bridge arm switch of any one phase bridge arm circuit is chopped and the lower bridge arm switch of the other phase bridge arm circuit is turned on, there is a situation where both bridge arm circuits are connected in series with the capacitor and the primary winding, which can correspondingly form a first access circuit that includes both capacitive and inductive loads. Connecting the first access circuit in parallel to the high-voltage DC bus can change the impedance characteristics of the high-voltage DC bus, thereby changing the inherent resonant frequency of the high-voltage DC bus, and realizing the effect of controlling the switching modules in the idle electrical equipment to suppress the resonance of the high-voltage DC bus.

[0115] Reference Figure 7 , Figure 7 This is a schematic diagram of the equivalent circuit of the high-voltage DC bus network in this embodiment. In a high-voltage DC bus network, it is assumed that electrical device n is an ECU, electrical device 1 is an OBC system, electrical device n is working, electrical device 1 is not working, and electrical device 1 is defined as an idle electrical device. Meanwhile, the load type of electrical device 1 is capacitive and inductive, specifically including capacitor Cp and transformer T1; the topology type of the switching module of electrical device 1 is a full-bridge switching topology, specifically including switching transistors S11-S14, where S1... S1 and S12 form a bridge arm circuit, with S11 as the upper bridge arm switch and S12 as the lower bridge arm switch. S13 and S14 form another bridge arm circuit, with S13 as the upper bridge arm switch and S14 as the lower bridge arm switch. The common connection of S11 and S12 is connected to one end of the primary winding of transformer T1 through capacitor Cp. The common connection of S13 and S14 is connected to the other end of the primary winding of transformer T1. The secondary winding of transformer T1 is connected to the output interface, through which voltage is output.

[0116] For example, the upper bridge arm switch S11 of the first phase bridge arm circuit can be controlled to chop, and the lower bridge arm switch S14 of the other phase bridge arm circuit can be controlled to conduct, forming a first access circuit, which will be connected in parallel to the high voltage DC bus to adjust its inherent resonant frequency.

[0117] The resonance suppression method in this embodiment can be specifically applied to scenarios where the idle electrical equipment is electrical equipment with capacitors and / or transformers (such as generator systems, DC-DC systems, OBC systems) or other electrical equipment with full-bridge switching circuits and capacitive and / or inductive loads. It utilizes the load characteristics of the electrical equipment that is not in operation among multiple electrical equipment on a common high-voltage DC bus, combined with specific switching control strategies to achieve resonance suppression.

[0118] In the fifth embodiment of this example, when the topology type is a relay and the load type is a charging box, the target control strategy includes the fifth control strategy; step S30 in this resonance suppression method may include steps S351 to S352:

[0119] Step S351: According to the fifth control strategy, control the relay to close to form a second access circuit; the second access circuit includes a charging box with an internal relay connected, and the charging box includes a boost charging box or a boost current charging box.

[0120] Step S352: Adjust the impedance characteristics of the high-voltage DC bus by connecting the second access circuit in parallel to the high-voltage DC bus, so as to adjust the inherent resonant frequency of the high-voltage DC bus.

[0121] It should be noted that when the load is a charging box, the switching module can directly use a relay to implement switching control, meaning the topology of the switching module is a relay. In some embodiments, an internal relay can also be installed inside the charging box. When the relay acting as the switching module is closed, a corresponding command can be sent to the charging box. Inside the charging box, its microprocessor can send a control signal to the internal relay, causing the internal relay to turn on. This creates a situation where the closed relay and the charging box with the internal relay turned on are connected in series. In this case, the charging box with the internal relay turned on is the second access circuit. Connecting this second access circuit in parallel to the high-voltage DC bus can change the impedance characteristics of the high-voltage DC bus, thereby changing the inherent resonant frequency of the high-voltage DC bus. This achieves the effect of suppressing high-voltage DC bus resonance by controlling the switching of the relay in the idle electrical equipment.

[0122] Reference Figure 8 , Figure 8This is a schematic diagram of the equivalent circuit of the high-voltage DC bus network in this embodiment. In a high-voltage DC bus network, it is assumed that electrical device n is an ECU, electrical device 1 is a fast charging system, electrical device n is working, electrical device 1 is not working, and electrical device 1 is defined as an idle electrical device. At the same time, the load type of electrical device 1 is a charging box, which is equipped with an internal relay. Figure 8 The equivalent circuit of the charging box is represented by internal relays connected in sequence and equivalent resistance, capacitance and inductance. The topology of the switching module of electrical equipment 1 is a relay, specifically including a relay Relay, which is connected to the charging box.

[0123] For example, the relay can be controlled to close with the internal relay of the charging box, forming a second access circuit including the charging box in the ON state. This second access circuit will be connected in parallel to the high-voltage DC bus to adjust its inherent resonant frequency.

[0124] The resonance suppression method in this embodiment can be specifically applied to scenarios where idle electrical equipment is a fast charging system or other electrical equipment with a charging box (including a boost charging box or a boost current charging box). It utilizes the capacitive load characteristics of the charging box, which is an electrical equipment that is not in operation among multiple electrical equipment on a common high-voltage DC bus, and combines it with a specific switching control strategy to achieve resonance suppression.

[0125] In the sixth embodiment of this example, when the topology type is a controllable switch and the load type is a resistive load, the target control strategy includes the sixth control strategy; step S30 in this resonance suppression method may include steps S361 to S362:

[0126] Step S361: According to the sixth control strategy, controllable switch is turned on to form a third access circuit; the third access circuit includes a resistive load.

[0127] Step S362 involves adjusting the quality factor of the high-voltage DC bus network by connecting the third access circuit in parallel to the high-voltage DC bus, thereby adjusting the inherent resonant frequency of the high-voltage DC bus.

[0128] It should be noted that when the load type is resistive, such as a resistor, the switching module uses a controllable switch. When the controllable switch is turned on, there is a situation where the controllable switch and the resistor are connected in series, which correspondingly forms a third access circuit including the resistive load. Connecting the third access circuit in parallel to the high-voltage DC bus can change the quality factor of the high-voltage DC bus network, thereby changing the inherent resonant frequency of the high-voltage DC bus. This achieves the effect of controlling the switching module in the idle electrical equipment to suppress the resonance of the high-voltage DC bus.

[0129] Reference Figure 9 , Figure 9This is a schematic diagram of the equivalent circuit of the high-voltage DC bus network in this embodiment. In a high-voltage DC bus network, it is assumed that electrical device n is an ECU, electrical device 1 is a PTC thermistor, electrical device n is working, electrical device 1 is not working, and electrical device 1 is identified as an idle electrical device. At the same time, the load type of electrical device 1 is a resistive load, specifically a thermistor RP; the topology type of the switching module of electrical device 1 is a controllable switch, specifically including a switch Sp, which is connected to the thermistor RP.

[0130] For example, the switch Sp can be turned on to form a third access circuit including a thermistor RP, which will be connected in parallel to the high-voltage DC bus to adjust its inherent resonant frequency.

[0131] The resonance suppression method in this embodiment can be specifically applied to scenarios where the idle electrical equipment is a PTC thermistor or other electrical equipment with controllable switches and resistive loads. It utilizes the impedance characteristics of the electrical equipment that is not in operation among multiple electrical equipment on a common high-voltage DC bus, combined with a specific switch control strategy to achieve resonance suppression.

[0132] Based on the above-described specific implementation methods, it can be seen that the resonance suppression method of this embodiment can have different switching control strategies, thereby achieving resonance suppression in different scenarios.

[0133] This embodiment provides a resonance suppression method. By utilizing the controllable switching characteristics and load impedance characteristics of electrical equipment, different load impedances are introduced into the high-voltage DC bus network through different switching combinations by controlling the switching modules in the non-operational electrical equipment. This improves the resonance network impedance characteristics and natural frequency of the high-voltage DC bus, which can avoid or reduce the resonance amplitude and achieve resonance suppression. This avoids many problems that may be caused by high-voltage DC bus resonance, and improves the robustness of the high-voltage DC bus network and the safety of the entire vehicle in a low-cost manner.

[0134] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the resonance suppression method of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0135] This application also provides a vehicle high-voltage system, as shown in the reference. Figure 10 , Figure 10 A schematic diagram of a communication network for a vehicle high-voltage system is provided. This vehicle high-voltage system may include:

[0136] A high-voltage direct current (HVDC) bus network includes a high-voltage power supply and multiple electrical devices. The electrical devices include interconnected switch modules and loads. The high-voltage power supply is connected to the switch modules of the multiple electrical devices through the high-voltage direct current bus.

[0137] The vehicle controller is connected to multiple electrical devices to implement the steps of the resonance suppression method as described in Embodiment 1 or 2 above.

[0138] The vehicle control unit (VCU) can communicate with multiple electrical devices via a CAN (Controller Area Network) network or a CANFD (CAN with Flexible Data-Rate) network. It can confirm the operating status of each electrical device and control idle electrical devices to enter the resonance suppression operating mode by issuing commands. After receiving the command from the VCU, the idle electrical devices execute the corresponding switching control to improve the impedance of the high-voltage DC bus.

[0139] For example, Figure 10 In this embodiment, the VCU communicates with n (n≥2) electrical devices via a CAN network, which specifically includes two buses, CANH and CANL. This embodiment applies a resonance suppression method to the vehicle's high-voltage system, which can rationally utilize existing electrical equipment to improve resonance, reduce overall vehicle costs, ensure that each electrical device operates in its optimal state, and improve the efficiency of the entire vehicle system.

[0140] The vehicle high-voltage system provided in this application employs the resonance suppression method described in the above embodiments, which solves the technical problems of resonance suppression methods in related technologies affecting the normal operation of the excitation source and electrical equipment, resulting in poor system compatibility and reduced robustness of the excitation source. Compared with related technologies, the beneficial effects of the vehicle high-voltage system provided in this application are the same as those of the resonance suppression method provided in the above embodiments, and other technical features of this vehicle high-voltage system are the same as those disclosed in the resonance suppression method of the above embodiments, and will not be repeated here.

[0141] This application also provides an all-in-one device, as described above. Figure 11 , Figure 11 A communication network diagram of an all-in-one device is provided, which may include:

[0142] A high-voltage direct current (HVDC) bus network includes a high-voltage power supply and multiple electrical devices. The electrical devices include interconnected switch modules and loads. The high-voltage power supply is connected to the switch modules of the multiple electrical devices through the high-voltage direct current bus.

[0143] At least one microprocessor, each microprocessor being connected to a plurality of electrical devices, to implement the steps of the resonance suppression method as described in Embodiment 1 or 2 above.

[0144] The microprocessor can communicate with multiple electrical devices via a CAN network or a CANFD network. When there is only one microprocessor, it can be a control device independent of each electrical device, or it can be a controller within one of the electrical devices. When there are multiple microprocessors, it can be a control device composed of multiple microprocessors, or it can be a controller belonging to multiple electrical devices, or it can be an external independent controller and corresponding controllers within multiple electrical devices. The specific configuration can be determined according to actual needs, so that one of the microprocessors executes the resonance suppression method, or multiple microprocessors cooperate with each other to execute the resonance suppression method. For example, a master controller and a slave controller can be determined first. The master controller can send commands to the slave controller via CAN communication to control the idle electrical devices to perform resonance suppression. It should be noted that when the command sent by the master controller conflicts with the vehicle's command, the vehicle's request is responded to first.

[0145] For example, Figure 11 The u-MCU (multi-functional microprocessor) communicates with n (n≥2) electrical devices via a CAN network. The CAN network specifically includes two buses, CANH and CANL. The u-MCU also connects to each electrical device via other wires to achieve other functions, such as start / stop control and voltage protection control, etc., which are not specifically limited here. In this embodiment, if a high-voltage DC bus resonance occurs when a certain electrical device is operating, the u-MCU can control a specific idle electrical device to perform resonance suppression according to the operating mode of each device.

[0146] The all-in-one device provided in this application employs the resonance suppression method described in the above embodiments, which solves the technical problems of resonance suppression methods in related technologies affecting the normal operation of the excitation source and electrical equipment, resulting in poor system compatibility and reduced robustness of the excitation source. Compared with related technologies, the beneficial effects of the all-in-one device provided in this application are the same as those of the resonance suppression method provided in the above embodiments, and other technical features of this all-in-one device are the same as those disclosed in the resonance suppression method of the above embodiments, and will not be repeated here.

[0147] The above are only some embodiments of this application and do not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A resonance suppression method, characterized in that, For a high-voltage direct current (HVDC) bus network, the HVDC bus network includes a high-voltage power supply and multiple electrical devices, each electrical device including interconnected switching modules and loads, the high-voltage power supply being connected to the switching modules of the multiple electrical devices via a high-voltage direct current bus; the resonance suppression method includes: When high-voltage DC bus resonance is detected, an idle electrical device is identified among the electrical devices that are not in operation. Based on the topology type and load type of the switch module in the idle electrical equipment, a target control strategy corresponding to the idle electrical equipment is determined in a preset control strategy; wherein, the preset control strategy includes switch control strategies corresponding to different topology types and different load types; According to the target control strategy, the switching module of the idle electrical equipment is controlled to perform actions to adjust the inherent resonant frequency of the high-voltage DC bus.

2. The resonance suppression method as described in claim 1, characterized in that, When the topology type is a three-phase bridge topology and the load type is an inductive load, the target control strategy includes a first control strategy; The step of controlling the switching module of the idle electrical equipment to perform actions according to the target control strategy to adjust the inherent resonant frequency of the high-voltage DC bus includes: According to the first control strategy, the upper arm switch of any one phase bridge arm circuit in the three-phase bridge topology is controlled to be chopped, and any one of the lower arm switches of the other two phase bridge arm circuits in the three-phase bridge topology is controlled to be turned on, so as to form the first equivalent circuit. The impedance characteristics of the high-voltage DC bus are adjusted by connecting the first equivalent circuit in parallel to the high-voltage DC bus, thereby adjusting the inherent resonant frequency of the high-voltage DC bus.

3. The resonance suppression method as described in claim 1, characterized in that, When the topology type is a three-phase bridge topology and the load type is an inductive load, the target control strategy includes a second control strategy; The step of controlling the switching module of the idle electrical equipment to perform actions according to the target control strategy to adjust the inherent resonant frequency of the high-voltage DC bus includes: According to the second control strategy, the upper arm switch of any one phase bridge arm circuit in the three-phase bridge topology is controlled to be chopped, and the lower arm switches of the other two phase bridge arm circuits in the three-phase bridge topology are controlled to be turned on simultaneously to form a second equivalent circuit. The impedance characteristics of the high-voltage DC bus are adjusted by connecting the second equivalent circuit in parallel to the high-voltage DC bus, thereby adjusting the inherent resonant frequency of the high-voltage DC bus.

4. The resonance suppression method as described in claim 1, characterized in that, When the topology type is a three-phase bridge topology and the load type is an inductive load, the target control strategy includes a third control strategy; The step of controlling the switching module of the idle electrical equipment to perform actions according to the target control strategy to adjust the inherent resonant frequency of the high-voltage DC bus includes: According to the third control strategy, the upper bridge arm switch of any one phase bridge arm circuit in the three-phase bridge topology is controlled to be chopped, and the lower bridge arm switch of any one phase bridge arm circuit is controlled to be turned on, so as to form a bridge arm through circuit. The impedance characteristics of the high-voltage DC bus are adjusted by connecting the bridge arm through circuit in parallel to the high-voltage DC bus, thereby adjusting the inherent resonant frequency of the high-voltage DC bus.

5. The resonance suppression method as described in claim 1, characterized in that, When the topology type is a full-bridge switch topology and the load type is a capacitive load and / or an inductive load, the target control strategy includes a fourth control strategy; The step of controlling the switching module of the idle electrical equipment to perform actions according to the target control strategy to adjust the inherent resonant frequency of the high-voltage DC bus includes: According to the fourth control strategy, the upper bridge arm switch of any phase bridge arm circuit in the full-bridge switch topology is controlled to be chopped, and the lower bridge arm switch of another phase bridge arm circuit in the full-bridge switch topology is controlled to be turned on, so as to form a first access circuit; the first access circuit includes the capacitive load, the inductive load, or the capacitive load and the inductive load connected in series. The impedance characteristics of the high-voltage DC bus are adjusted by connecting the first access circuit in parallel to the high-voltage DC bus, thereby adjusting the inherent resonant frequency of the high-voltage DC bus.

6. The resonance suppression method as described in claim 1, characterized in that, When the topology type is a relay and the load type is a charging box, the target control strategy includes a fifth control strategy; The step of controlling the switching module of the idle electrical equipment to perform actions according to the target control strategy to adjust the inherent resonant frequency of the high-voltage DC bus includes: According to the fifth control strategy, the relay is controlled to close to form a second access circuit; the second access circuit includes the charging box with the internal relay connected, and the charging box includes a boost charging box or a boost current charging box. The impedance characteristics of the high-voltage DC bus are adjusted by connecting the second access circuit in parallel to the high-voltage DC bus, thereby adjusting the inherent resonant frequency of the high-voltage DC bus.

7. The resonance suppression method as described in claim 1, characterized in that, When the topology type is a controllable switch and the load type is a resistive load, the target control strategy includes a sixth control strategy; The step of controlling the switching module of the idle electrical equipment to perform actions according to the target control strategy to adjust the inherent resonant frequency of the high-voltage DC bus includes: According to the sixth control strategy, the controllable switch is turned on to form a third access circuit; the third access circuit includes the resistive load. The quality factor of the high-voltage DC bus network is adjusted by connecting the third access circuit in parallel to the high-voltage DC bus, thereby adjusting the inherent resonant frequency of the high-voltage DC bus.

8. The resonance suppression method according to any one of claims 1 to 7, characterized in that, Before the step of identifying an idle electrical device among the non-operating electrical devices when high-voltage DC bus resonance is detected, the resonance suppression method further includes: The switching carrier frequency, operating frequency, and carrier frequency harmonic noise of the electrical equipment in operation are obtained, as well as the inherent resonant frequency of the high-voltage DC bus; the inherent resonant frequency is the inherent frequency of the equivalent circuit formed by the impedance of all electrical equipment in operation and the impedance of the high-voltage power supply. The inherent resonant frequency is compared with the switching carrier frequency, the operating frequency, and the carrier frequency harmonic noise, respectively. If the inherent resonant frequency is equal to the switch carrier frequency, the operating frequency, or the carrier frequency harmonic noise, then it is determined that high-voltage DC bus resonance has been detected.

9. A high-voltage system for a vehicle, characterized in that, include: A high-voltage direct current (HVDC) bus network, comprising a high-voltage power supply and multiple electrical devices, wherein the electrical devices include interconnected switch modules and loads, and the high-voltage power supply is connected to the switch modules of the multiple electrical devices respectively via the high-voltage direct current bus; A vehicle controller, which is connected to a plurality of the electrical devices respectively, to implement the steps of the resonance suppression method as described in any one of claims 1 to 8.

10. An all-in-one device, characterized in that, include: A high-voltage direct current (HVDC) bus network, comprising a high-voltage power supply and multiple electrical devices, wherein the electrical devices include interconnected switch modules and loads, and the high-voltage power supply is connected to the switch modules of the multiple electrical devices respectively via the high-voltage direct current bus; At least one microprocessor, each of the microprocessors being connected to a plurality of the electrical devices to implement the steps of the resonance suppression method as described in any one of claims 1 to 8.

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