Method and apparatus for regulating output voltage of vehicle, storage medium, product, and vehicle

Abstract

Provided are a method and apparatus for regulating an output voltage of a vehicle, a storage medium, a product, and a vehicle. The method comprises: when a vehicle transmits electrical energy to a power grid, on the basis of reactive power currently outputted by an on-board charger (OBC) and a current bus alternating-current voltage value of the power grid, regulating an alternating-current voltage value currently outputted by the OBC, so that the bus alternating-current voltage value of the power grid is within a predetermined range.

Description

Methods, devices, storage media, products, and vehicles for regulating vehicle output voltage.

[0001] Cross-references to related applications

[0002] This disclosure claims priority to Chinese Patent Application No. 202410687642.7, filed on May 29, 2024, entitled "Method, Apparatus, Storage Medium, Product and Vehicle for Regulating Vehicle Output Voltage", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the technical field of vehicle charging control methods, specifically to a method, apparatus, storage medium, product, and vehicle for regulating vehicle output voltage. Background Technology

[0004] Vehicle-to-Grid (V2G) technology refers to the technology of electric vehicles supplying electricity to the power grid. Its core idea is to utilize the energy storage of numerous electric vehicles as a buffer between the power grid and renewable energy sources. V2G technology is receiving widespread attention because it can significantly alleviate the problems of low grid efficiency and renewable energy fluctuations, and can also generate revenue for electric vehicle users. Summary of the Invention

[0005] The purpose of this disclosure is to provide a method, apparatus, storage medium, product, and vehicle for regulating the output voltage of a vehicle to stabilize the voltage of the power grid.

[0006] To achieve the above objectives, this disclosure provides a method for adjusting the output voltage of a vehicle, the method comprising:

[0007] When the vehicle transmits electrical energy to the power grid, the AC voltage value currently output by the on-board charger (OBC) is adjusted according to the reactive power currently output by the OBC and the current AC bus voltage value of the power grid, so that the AC bus voltage value of the power grid is within a predetermined range.

[0008] In some embodiments, adjusting the AC voltage value currently output by the OBC based on the reactive power currently output by the on-board charger (OBC) and the current AC bus voltage value of the power grid includes:

[0009] Based on the reactive power currently output by the OBC and the current AC bus voltage of the power grid, the AC voltage currently output by the OBC is adjusted using an outer voltage loop and an inner current loop.

[0010] In some embodiments, adjusting the AC voltage value currently output by the OBC based on the reactive power currently output by the OBC and the current AC bus voltage value of the power grid, using a voltage outer loop-current inner loop approach, includes:

[0011] Based on the reactive power currently output by the OBC and the current AC bus voltage of the power grid, perform reactive power control in the outer loop and output the q-axis reference current value.

[0012] Perform active power control on the outer loop and output the d-axis reference current value;

[0013] Based on the q-axis reference current value and the d-axis reference current value, inner loop current control is performed to output AC voltage value.

[0014] In some embodiments, the step of performing outer-loop reactive power control based on the reactive power currently output by the OBC and the current AC bus voltage of the power grid, and outputting a q-axis reference current value, includes:

[0015] Based on the current AC bus voltage value and the reference value of the AC bus voltage of the power grid, the reference value of the reactive power output by the OBC is obtained using a closed-loop control method.

[0016] Based on the reference value of the reactive power output by the OBC and the current reactive power output by the OBC, the q-axis reference current value is obtained using a closed-loop control method.

[0017] In some embodiments, the closed-loop control method includes at least one of the following: PID control method, PI control method, and PD control method.

[0018] In some embodiments, the method further includes:

[0019] The reference value of the reactive power output by the OBC is limited to a predetermined reference value range; and / or,

[0020] The q-axis reference current value is limited to a predetermined current value range.

[0021] In some embodiments, the step of performing inner-loop current control based on the q-axis reference current value and the d-axis reference current value to output an AC voltage value includes:

[0022] When the current value currently output by the OBC is greater than the current value threshold, the q-axis current value and / or d-axis current value currently output by the OBC are adjusted so that the adjusted current value currently output by the OBC is less than or equal to the current value threshold. When adjusting, priority is given to ensuring that the q-axis current value currently output by the OBC does not decrease.

[0023] Based on the q-axis reference current value, the d-axis reference current value, the adjusted q-axis current value, and the adjusted d-axis current value, inner loop current control is performed to output AC voltage value.

[0024] In some embodiments, adjusting the q-axis current value and / or d-axis current value currently output by the OBC includes:

[0025] If the current q-axis current value output by the OBC is less than or equal to the q-axis reference current value, then the current q-axis current value output by the OBC is used as the adjusted q-axis current value, and the current d-axis current value output by the OBC is reduced.

[0026] If the current output q-axis current value of the OBC is greater than the current output q-axis reference current value, then the current output d-axis current value of the OBC is used as the adjusted current value, and the current output d-axis current value of the OBC is reduced.

[0027] In some embodiments, when the vehicle transmits electrical energy to the power grid, adjusting the AC voltage value currently output by the OBC based on the reactive power currently output by the on-board charger (OBC) and the current AC bus voltage value of the power grid includes:

[0028] When the vehicle transmits electrical energy to the power grid and the AC bus voltage of the power grid is not within the predetermined range, the AC voltage value currently output by the on-board charger (OBC) is adjusted according to the reactive power currently output by the on-board charger (OBC) and the current AC bus voltage value of the power grid.

[0029] This disclosure also provides a vehicle output voltage regulating device, the device comprising:

[0030] A memory on which computer programs are stored;

[0031] A processor is configured to execute the computer program in the memory to implement the steps of the method described above provided in this disclosure.

[0032] This disclosure also provides a non-transitory computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of the methods described above provided in this disclosure.

[0033] This disclosure also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the methods described above provided in this disclosure.

[0034] This disclosure also provides a vehicle including the vehicle output voltage regulating device provided in this disclosure.

[0035] The above technical solution adjusts the AC voltage output of the OBC based on its current reactive power output and the current AC bus voltage of the power grid. In other words, the AC voltage is controlled by the reactive power output of the OBC. Reactive power is the electrical power required to establish an alternating magnetic field and induced magnetic flux. Therefore, in a V2G scenario, controlling the reactive power output of the OBC can control the AC voltage output by the vehicle, thereby improving the stability of the AC bus voltage of the power grid, ensuring grid voltage security, and reducing the risk of voltage collapse in the power system.

[0036] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0037] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0038] Figure 1 is a schematic diagram of an implementation scenario of a vehicle output voltage adjustment method provided in an exemplary embodiment.

[0039] Figure 2 is a flowchart of a method for adjusting the output voltage of a vehicle according to an exemplary embodiment.

[0040] Figure 3 is a schematic diagram of an exemplary embodiment of a voltage outer loop-current inner loop adjustment method.

[0041] Figure 4 is a schematic diagram of the output q-axis reference current value provided in an exemplary embodiment.

[0042] Figure 5 is a schematic diagram of adjusting the current value of the OBC output according to an exemplary embodiment.

[0043] Figure 6 is a block diagram of a vehicle output voltage regulation device provided in an exemplary embodiment. Detailed Implementation

[0044] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0045] Figure 1 is a schematic diagram of an implementation scenario of a vehicle output voltage regulation method provided in an exemplary embodiment. As shown in Figure 1, in a V2G scenario, the on-board charger (OBC) converts the DC power output from the power battery into AC power. The method provided in this disclosure is applied to a vehicle output voltage regulation device installed in the vehicle, which regulates the AC power output from the OBC and transmits the regulated AC power to the power grid via a charging pile. The arrows in Figure 1 indicate the direction of current flow.

[0046] Figure 2 is a flowchart of a method for adjusting the output voltage of a vehicle according to an exemplary embodiment. As shown in Figure 2, the method includes step S101.

[0047] In step S101, when the vehicle transmits electrical energy to the power grid, the AC voltage value currently output by the OBC is adjusted according to the reactive power currently output by the OBC and the current AC voltage value of the power grid bus, so that the AC voltage value of the power grid bus is within a predetermined range.

[0048] The current AC bus voltage of the power grid can be acquired, for example, through a voltage transformer (PT) and transmitted to the vehicle via wireless communication. The reactive power output of the OBC can be calculated using methods in related technologies. Regulating the AC voltage output of the OBC and transmitting it to the power grid (e.g., via a charging station) ensures that the AC bus voltage of the power grid remains within a predetermined range, thereby stabilizing the grid voltage.

[0049] In this scheme, the AC voltage output of the OBC is adjusted based on its current reactive power output and the current AC bus voltage of the power grid. In other words, the AC voltage is controlled by the reactive power output of the OBC. Reactive power is the electrical power required to establish an alternating magnetic field and induced magnetic flux. Therefore, in a V2G scenario, controlling the reactive power output of the OBC can control the AC voltage output by the vehicle, thereby improving the stability of the AC bus voltage of the power grid, ensuring grid voltage security, and reducing the risk of voltage collapse in the power system.

[0050] In another embodiment, the AC voltage value currently output by the on-board charger (OBC) is adjusted based on the reactive power currently output by the OBC and the current AC bus voltage value of the power grid. This includes adjusting the AC voltage value currently output by the OBC using a voltage outer loop and current inner loop method, based on the reactive power currently output by the OBC and the current AC bus voltage value of the power grid.

[0051] The voltage outer loop and current inner loop control method mainly consists of two levels: voltage outer loop control and current inner loop control. The goal of voltage outer loop control is to regulate and maintain voltage signal stability, while the goal of current inner loop control is to regulate current stability and response speed. By using the voltage outer loop and current inner loop control method to adjust the current output AC voltage value of the OBC, the system's response speed and stability can be effectively improved.

[0052] In another embodiment, based on the reactive power currently output by the OBC and the current AC bus voltage of the power grid, the AC voltage currently output by the OBC is adjusted using a voltage outer loop-current inner loop method, including:

[0053] Based on the reactive power output of the OBC and the current AC bus voltage of the power grid, perform reactive power control in the outer loop and output the q-axis reference current value.

[0054] Perform active power control on the outer loop and output the d-axis reference current value;

[0055] Based on the q-axis reference current value and the d-axis reference current value, inner loop current control is performed to output AC voltage value.

[0056] Figure 3 is a schematic diagram of an exemplary embodiment of a voltage outer loop-current inner loop adjustment method. As shown in Figure 3, the current three-phase current i currently output by the OBC is... a i b i c After Park transformation, it is converted into d-axis current components. isd and q-axis current component i sq Based on the q-axis current component i sq d-axis current component i sd q-axis reference current value i qref d-axis reference current value i dref Perform inner loop current control.

[0057] For the control of active power in the outer loop, both active power control and DC voltage control methods can be used. For the control of reactive power in the outer loop, this scheme uses the current reactive power output of the OBC and the current AC bus voltage of the power grid for control.

[0058] In this embodiment, in the voltage outer loop-current inner loop method, the reactive power of the outer loop is controlled according to the reactive power output of the OBC and the current AC bus voltage value of the power grid to obtain the q-axis reference current value, and the current inner loop control is performed to adjust the AC voltage value output by the OBC. The response speed is fast and the voltage regulation stability is good.

[0059] In another embodiment, based on the reactive power currently output by the OBC and the current AC bus voltage of the power grid, outer-loop reactive power control is performed, outputting a q-axis reference current value, including:

[0060] 1) Based on the current AC bus voltage value and the reference value of the AC bus voltage of the power grid, the reference value of the reactive power output of the OBC is obtained by using the closed-loop control method.

[0061] In this closed-loop control, the input is the deviation between the current AC bus voltage value and the reference value of the AC bus voltage, and the output is the reference value of the reactive power output by the OBC.

[0062] 2) Based on the reference value of the reactive power output by the OBC and the current reactive power output by the OBC, the q-axis reference current value is obtained using a closed-loop control method.

[0063] In this closed-loop control, the input is the deviation between the reference value of the reactive power output by the OBC and the current reactive power output by the OBC, and the output is the q-axis reference current value.

[0064] The conversion relationship between the deviation of the bus AC voltage and the reactive power output by the OBC can be determined according to methods in relevant technologies. Similarly, the conversion relationship between the reactive power deviation and the q-axis reference current value can be determined according to methods in relevant technologies.

[0065] Closed-loop control methods may include at least one of the following: proportional-integral-derivative (PID) control, PI control, and PD control.

[0066] In this embodiment, the reactive power output by the OBC is used as an intermediate parameter. The deviation between the current AC bus voltage value and the reference value of the AC bus voltage, and the deviation between the reference value of the reactive power output by the OBC and the current reactive power output by the OBC are used as inputs for two closed-loop controls to obtain the q-axis reference current value. This method has good accuracy and voltage regulation effect.

[0067] In another embodiment, the method further includes: limiting a reference value of the reactive power output by the OBC to a predetermined reference value range; and / or limiting a q-axis reference current value to a predetermined current value range.

[0068] The predetermined reference value range can be the range of reactive power that the OBC can output, which is determined in advance based on the specific parameters in the vehicle, reflecting the vehicle's configuration. Similarly, the predetermined current value range can be the range of q-axis current values ​​that the OBC can output, which is determined in advance based on the specific parameters in the vehicle, reflecting the vehicle's configuration.

[0069] The results obtained from the closed-loop control described above can be further limited to a predetermined range. Specifically, if the reference value of the reactive power output of the OBC obtained from the closed-loop control is greater than the upper limit of the reference value range, then the result of the closed-loop control can be replaced by the upper limit of the reference value range; similarly, if the q-axis reference current value obtained from the closed-loop control is greater than the upper limit of the current value range, then the result of the closed-loop control can be replaced by the upper limit of the current value range.

[0070] In this embodiment, during the process of determining the q-axis reference current value, the reference value of the reactive power output by the OBC and the q-axis reference current value are limited according to the vehicle configuration, so that the control result is combined with the actual situation of the vehicle, the voltage control is more accurate, and the voltage stabilization effect is better.

[0071] Figure 4 is a schematic diagram of the output q-axis reference current value provided in an exemplary embodiment. In the embodiment of Figure 4, the current bus AC voltage value |U s |Reference value for AC voltage of busbar|U sref The difference is input to the PI controller, and the output is the reference value Q of the reactive power output by the OBC. ref Among them, the reference value Q of the reactive power output by the OBC is... ref Q is limited to a predetermined reference range. min Q is the lower limit of the reference range. max This represents the upper limit of the reference value range.

[0072] The reference value Q of the reactive power output by the OBC. ref The difference between the reactive power Q output by the current controller and the reactive power Q output by the OBC is input to the PI controller, and the output is the q-axis reference current value i. qref Among them, the q-axis reference current value i qref Limited to a predetermined current value range, i qmin i is the lower limit of the current value range. qmax This represents the upper limit of the current value range.

[0073] In other embodiments of this solution, when a current over-limit occurs, a current limiting control method that prioritizes reactive current over active current can be adopted.

[0074] In another embodiment, inner-loop current control is performed based on the q-axis reference current value and / or the d-axis reference current value to output an AC voltage value, including:

[0075] When the current value currently output by the OBC is greater than the current value threshold, the current value of the q-axis current and / or the current value of the d-axis current of the OBC is adjusted so that the adjusted current value of the OBC is less than or equal to the current value threshold. When adjusting, priority is given to ensuring that the current value of the q-axis current of the OBC does not decrease.

[0076] Based on the q-axis reference current value, d-axis reference current value, adjusted q-axis current value, and adjusted d-axis current value, inner loop current control is performed to output AC voltage value.

[0077] Specifically, when the current value output by the OBC exceeds the current threshold, it is considered that a current overrun has occurred. The current threshold can be predetermined based on experiments or experience. When the current exceeds the limit, the current value can be adjusted to avoid exceeding the limit. The current output by the OBC is an alternating current. During adjustment, the current values ​​on the q-axis and d-axis are calculated, prioritizing ensuring that the current output q-axis current value of the OBC does not decrease. The q-axis current value reflects the magnitude of reactive power; therefore, prioritizing ensuring that the q-axis current value does not decrease prioritizes ensuring reactive power stability, thereby stabilizing the AC voltage value output by the OBC.

[0078] Specific control strategies can be set to prioritize ensuring that the current q-axis current value of the OBC does not decrease. For example, if reducing the d-axis current value can make the AC current value less than or equal to the current threshold while the current q-axis current value of the OBC remains unchanged, then the d-axis current value is reduced until the AC current value equals the current threshold.

[0079] In this embodiment, when controlling the current value currently output by the OBC to exceed the limit, priority is given to ensuring the stability of reactive power. This stabilizes the AC voltage value output by the OBC, which is beneficial to the stability of the grid bus voltage.

[0080] In another embodiment, adjusting the q-axis current value and / or d-axis current value currently output by the OBC includes:

[0081] 1) If the current output q-axis current value of OBC is less than or equal to the q-axis reference current value, then the current output q-axis current value of OBC will be used as the adjusted q-axis current value, and the current output d-axis current value of OBC will be reduced.

[0082] The q-axis reference current value is the ideal value for the current q-axis current output of the OBC. If the current q-axis current output of the OBC is less than or equal to the q-axis reference current value, then the current q-axis current output of the OBC does not need to be changed. You can simply decrease the current d-axis current output of the OBC until the adjusted current output of the OBC equals the current threshold value.

[0083] 2) If the current output q-axis current value of OBC is greater than the q-axis reference current value, then the q-axis reference current value will be used as the adjusted q-axis current value, and the current output d-axis current value of OBC will be reduced.

[0084] If the current output q-axis current value of the OBC is greater than the q-axis reference current value, the current output q-axis current value of the OBC can be adjusted to its ideal q-axis reference current value, and the current output d-axis current value of the OBC can be reduced until the adjusted current output current value of the OBC is equal to the current value threshold.

[0085] In this embodiment, the q-axis reference current value is used as the ideal value for the current q-axis current output of the OBC. Based on this, priority is given to ensuring that the current q-axis current output of the OBC does not decrease. This adjustment of the OBC's output current value makes the reactive power transmitted from the vehicle to the grid more stable, thereby stabilizing the grid's bus voltage.

[0086] Figure 5 is a schematic diagram illustrating the adjustment of the current value output by the OBC according to an exemplary embodiment. As shown in Figure 5, the radius of the circle represents the current value threshold. The vertical axis represents the q-axis reference current value i. qref The horizontal axis represents the reference current value i along the d-axis. dref The first vector 'a' represents the AC current output by the OBC before adjustment, and its q-axis current value 'i'. qo d-axis current value i do If the magnitude of the first vector 'a' is greater than the radius of the circle, i.e., the current threshold, then the q-axis current value 'i' is maintained. qo Keep the d-axis current value i unchanged. do , until the adjusted second vector b is reached.

[0087] The second vector b represents the adjusted AC current, and its q-axis current value i ql with i qo Equal, d-axis current value i dl Compared to i do It has decreased. The magnitude of the second vector b is equal to the current threshold value.

[0088] In the aforementioned embodiments, the output voltage can be adjusted simultaneously with the vehicle's V2G charging, or it can be adjusted only when the AC voltage of the power grid bus is determined to be unstable.

[0089] In another embodiment, when the vehicle is transmitting electrical energy to the power grid, the AC voltage value currently output by the on-board charger (OBC) is adjusted based on the reactive power currently output by the OBC and the current AC bus voltage value of the power grid, including:

[0090] When a vehicle transmits electrical energy to the power grid and the AC voltage of the power grid bus is not within a predetermined range, the AC voltage value currently output by the on-board charger (OBC) is adjusted according to the reactive power output by the on-board charger (OBC) and the current AC voltage value of the power grid bus.

[0091] If the AC bus voltage of the power grid is not within a predetermined range, it can be considered that the AC bus voltage is unstable. For example, the predetermined range could be 370V to 390V. In this embodiment, the AC bus voltage of the power grid can be monitored in real time during the vehicle's charging process. When it is determined that the AC bus voltage of the power grid is not within the predetermined range, the aforementioned voltage regulation is activated.

[0092] Methods for determining that the AC voltage value of the power grid bus is not within a predetermined range may include, for example, determining that the AC voltage value of the power grid bus exceeds the predetermined range for a predetermined duration.

[0093] In this embodiment, when an unstable AC voltage is detected on the power grid bus, the voltage output by the OBC is adjusted as described above, which reduces the amount of data processing and saves computing power at the vehicle end.

[0094] Based on the same inventive concept, this disclosure also provides a vehicle output voltage regulating device. FIG6 is a block diagram of a vehicle output voltage regulating device provided in an exemplary embodiment. As shown in FIG6, the vehicle output voltage regulating device 600 includes a regulating module 601.

[0095] The adjustment module 601 is used to adjust the AC voltage value currently output by the on-board charger (OBC) based on the reactive power currently output by the on-board charger (OBC) and the current AC bus voltage value of the power grid when the vehicle is transmitting electrical energy to the power grid, so that the AC bus voltage value of the power grid is within a predetermined range.

[0096] In some embodiments, the adjustment module 601 is used to: adjust the AC voltage value currently output by the OBC according to the reactive power currently output by the OBC and the current AC bus voltage value of the power grid, using a voltage outer loop-current inner loop method.

[0097] In some embodiments, the adjustment module 601 includes a first control submodule, a second control submodule, and a third control submodule.

[0098] The first control submodule is used to perform reactive power control of the outer loop based on the reactive power output of the OBC and the current AC bus voltage of the power grid, and outputs the q-axis reference current value.

[0099] The second control submodule is used for active power control of the outer loop and outputs the d-axis reference current value.

[0100] The third control submodule is used to perform inner-loop current control based on the q-axis reference current value and the d-axis reference current value, and output AC voltage value.

[0101] In some embodiments, the first control submodule is used for:

[0102] Based on the current AC bus voltage value and the reference value of the AC bus voltage of the power grid, the reference value of the reactive power output by the OBC is obtained by using the closed-loop control method.

[0103] Based on the reference value of the reactive power output by the OBC and the current reactive power output by the OBC, the q-axis reference current value is obtained using a closed-loop control method.

[0104] In some embodiments, the closed-loop control method includes at least one of the following: PID control method, PI control method, and PD control method.

[0105] In some embodiments, the first control submodule is further configured to: limit the reference value of the reactive power output by the OBC to a predetermined reference value range; and / or limit the q-axis reference current value to a predetermined current value range.

[0106] In some embodiments, the third control submodule is used for:

[0107] When the current value currently output by the OBC is greater than the current value threshold, the current value of the q-axis current and / or the current value of the d-axis current of the OBC is adjusted so that the adjusted current value of the OBC is less than or equal to the current value threshold. When adjusting, priority is given to ensuring that the current value of the q-axis current of the OBC does not decrease.

[0108] Based on the q-axis reference current value, d-axis reference current value, adjusted q-axis current value, and adjusted d-axis current value, inner loop current control is performed to output AC voltage value.

[0109] In some embodiments, the third control submodule is used for:

[0110] If the current output q-axis current value of OBC is less than or equal to the q-axis reference current value, then the current output q-axis current value of OBC will be used as the adjusted q-axis current value, and the current output d-axis current value of OBC will be reduced.

[0111] If the current output q-axis current value of OBC is greater than the q-axis reference current value, then the q-axis reference current value will be used as the adjusted q-axis current value, and the current output d-axis current value of OBC will be reduced.

[0112] In some embodiments, the adjustment module is configured to: adjust the AC voltage value currently output by the on-board charger (OBC) based on the reactive power currently output by the on-board charger (OBC) and the current AC voltage value of the power grid when the vehicle transmits electrical energy to the power grid and the AC voltage value of the power grid bus is not within a predetermined range.

[0113] This disclosure also provides a vehicle output voltage regulating device, the device including a memory and a processor, the memory storing a computer program; the processor is used to execute the computer program in the memory to implement the steps of the method provided in this disclosure.

[0114] This disclosure also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the methods described above provided in this disclosure.

[0115] This disclosure also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the methods described above provided in this disclosure.

[0116] This disclosure also provides a vehicle including the vehicle output voltage regulating device provided in this disclosure.

[0117] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0118] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0119] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A method for regulating the output voltage of a vehicle, wherein, The method includes: When the vehicle transmits electrical energy to the power grid, the AC voltage value currently output by the on-board charger (OBC) is adjusted according to the reactive power currently output by the OBC and the current AC bus voltage value of the power grid, so that the AC bus voltage value of the power grid is within a predetermined range.

2. The method according to claim 1, wherein, The step of adjusting the AC voltage value currently output by the OBC based on the reactive power currently output by the on-board charger (OBC) and the current AC bus voltage value of the power grid includes: Based on the reactive power currently output by the OBC and the current AC bus voltage of the power grid, the AC voltage currently output by the OBC is adjusted using an outer voltage loop and an inner current loop.

3. The method according to claim 2, wherein, The step of adjusting the AC voltage value currently output by the OBC based on the reactive power currently output by the OBC and the current AC bus voltage value of the power grid, using a voltage outer loop-current inner loop approach, includes: Based on the reactive power currently output by the OBC and the current AC bus voltage of the power grid, perform reactive power control in the outer loop and output the q-axis reference current value. Perform active power control on the outer loop and output the d-axis reference current value; Based on the q-axis reference current value and the d-axis reference current value, inner loop current control is performed to output AC voltage value.

4. The method according to claim 3, wherein, The process of performing outer-loop reactive power control based on the current reactive power output of the OBC and the current AC bus voltage of the power grid, and outputting a q-axis reference current value, includes: Based on the current AC bus voltage value and the reference value of the AC bus voltage of the power grid, the reference value of the reactive power output by the OBC is obtained using a closed-loop control method. Based on the reference value of the reactive power output by the OBC and the current reactive power output by the OBC, the q-axis reference current value is obtained using a closed-loop control method.

5. The method according to claim 4, wherein, The closed-loop control method includes at least one of the following: PID control method, PI control method, and PD control method.

6. The method according to claim 4 or 5, wherein, The method further includes: The reference value of the reactive power output by the OBC is limited to a predetermined reference value range; and / or, The q-axis reference current value is limited to a predetermined current value range.

7. The method according to any one of claims 3 to 6, wherein, The step of performing inner-loop current control based on the q-axis reference current value and the d-axis reference current value to output an AC voltage value includes: When the current value currently output by the OBC is greater than the current value threshold, the q-axis current value and / or d-axis current value currently output by the OBC are adjusted so that the adjusted current value currently output by the OBC is less than or equal to the current value threshold. When adjusting, priority is given to ensuring that the q-axis current value currently output by the OBC does not decrease. Based on the q-axis reference current value, the d-axis reference current value, the adjusted q-axis current value, and the adjusted d-axis current value, inner loop current control is performed to output AC voltage value.

8. The method according to claim 7, wherein, The adjustment of the q-axis current value and / or d-axis current value currently output by the OBC includes: If the current q-axis current value output by the OBC is less than or equal to the q-axis reference current value, then the current q-axis current value output by the OBC is used as the adjusted q-axis current value, and the current d-axis current value output by the OBC is reduced. If the current output q-axis current value of the OBC is greater than the current output q-axis reference current value, then the current output d-axis current value of the OBC is used as the adjusted current value, and the current output d-axis current value of the OBC is reduced.

9. The method according to any one of claims 1 to 8, wherein, When the vehicle transmits electrical energy to the power grid, adjusting the AC voltage value currently output by the OBC based on the reactive power currently output by the on-board charger (OBC) and the current AC bus voltage value of the power grid includes: When the vehicle transmits electrical energy to the power grid and the AC bus voltage of the power grid is not within the predetermined range, the AC voltage value currently output by the on-board charger (OBC) is adjusted according to the reactive power currently output by the on-board charger (OBC) and the current AC bus voltage value of the power grid.

10. A device for regulating the output voltage of a vehicle, wherein, The device includes: A memory on which computer programs are stored; A processor for executing the computer program in the memory to implement the steps of the method according to any one of claims 1 to 9.

11. A non-transitory computer-readable storage medium having a computer program stored thereon, wherein, When executed by a processor, the computer program implements the steps of the method according to any one of claims 1 to 9.

12. A computer program product, wherein, It includes a computer program that, when executed by a processor, implements the steps of the method according to any one of claims 1 to 9.

13. A vehicle, wherein, Includes the vehicle output voltage regulating device as described in claim 10.

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