Converter control method and device, electronic equipment, storage medium and program product

Abstract

The present application relates to the technical field of electric power, and discloses a converter control method and device, electronic equipment, a storage medium and a program product, and the present application comprises: obtaining a reference vector of a converter and a corresponding zero common-mode vector subset; the zero common-mode vector subset comprises a plurality of zero common-mode vectors for constructing a virtual vector; each zero common-mode vector is combined by using a preset combination coefficient to obtain the virtual vector; the preset combination coefficient is determined based on the angle of the reference vector; a voltage deviation of a direct current side of the converter is taken as an input of PID control to obtain a PID adjustment term; based on the PID adjustment term and a preset reference adjustment coefficient, a midpoint adjustment coefficient is determined; the preset combination coefficient is adjusted according to the midpoint adjustment coefficient to obtain an adjusted virtual vector; and the converter is controlled to operate based on the adjusted virtual vector. The present application adjusts the effect of the midpoint current while maintaining the zero common-mode characteristic of the virtual vector, thereby improving the stability of the midpoint voltage in the operation process of the converter.

Description

Technical Field

[0001] This invention relates to the field of power technology, and more specifically to converter control methods, devices, electronic equipment, storage media, and program products. Background Technology

[0002] With the rapid development of new energy power generation, electric vehicles, motor drives, and energy storage systems, three-level converters are widely used in power conversion systems due to their advantages such as high output voltage quality, low voltage stress on switching devices, low harmonic content, and high system efficiency. To achieve stable operation of three-level converters, existing technologies typically employ corresponding modulation methods to generate drive signals for the power switching devices based on the control target, thereby controlling the converter's output AC voltage.

[0003] However, existing converter modulation and control methods are difficult to simultaneously achieve common-mode voltage suppression and midpoint potential balance in actual operation, resulting in a decline in converter operating performance. Summary of the Invention

[0004] This invention provides a converter control method, device, electronic device, storage medium, and program product to solve the problem that it is difficult to simultaneously achieve common-mode voltage suppression and midpoint potential balance, which leads to a decrease in converter operating performance.

[0005] In a first aspect, the present invention provides a converter control method, comprising: Obtain the converter's reference vector and its corresponding zero common-mode vector subset; the reference vector is used to characterize the magnitude and direction of the target voltage expected to be output by the converter at the current moment, and the zero common-mode vector subset includes multiple zero common-mode vectors used to construct virtual vectors; A virtual vector is obtained by combining each zero common-mode vector using preset combination coefficients; the preset combination coefficients are determined based on the angle of the reference vector. The voltage deviation on the DC side of the converter is used as the input to the PID control to obtain the PID adjustment term; The midpoint adjustment coefficient is determined based on the PID control term and the preset benchmark adjustment coefficient. The preset combination coefficients are adjusted according to the midpoint adjustment coefficient to obtain the adjusted virtual vector; The converter operates based on the adjusted virtual vector control.

[0006] The converter control method provided in this embodiment obtains a subset of zero common-mode vectors corresponding to the converter reference vector, and determines a preset combination coefficient based on the reference vector angle. Multiple zero common-mode vectors are combined to form a virtual vector, enabling the converter to achieve voltage output control based on the zero common-mode vector, thereby reducing the common-mode voltage during converter operation. The PID regulation term is determined according to the voltage deviation on the DC side of the converter, and the midpoint regulation coefficient is obtained by combining the reference regulation coefficient. The combination ratio between the zero common-mode vectors in the virtual vector is dynamically adjusted through the midpoint regulation coefficient, so that the virtual vector maintains the zero common-mode characteristics while adjusting the effect of the midpoint current according to the DC side midpoint voltage state, thereby improving the problem of voltage imbalance between the upper and lower capacitors on the DC side and improving the midpoint voltage stability during converter operation.

[0007] In one optional implementation, the midpoint adjustment coefficient is determined based on the PID control term and a preset baseline adjustment coefficient, including: The preset reference adjustment coefficient is adjusted based on the PID control term to obtain the adjusted reference adjustment coefficient; The compensation terms are determined based on the operating status of the converter; Based on the compensation term, the adjusted benchmark adjustment coefficient is compensated to obtain the midpoint adjustment coefficient.

[0008] The converter control method provided in this embodiment adjusts a preset reference adjustment coefficient based on a PID adjustment term determined by the DC-side voltage deviation, so that the adjusted reference adjustment coefficient can reflect the feedback adjustment requirements corresponding to the current midpoint voltage deviation. A compensation term is determined according to the operating state of the converter, and the compensation term is used to further correct the reference adjustment coefficient after PID adjustment, so that the final midpoint adjustment coefficient can not only respond to the DC-side midpoint voltage deviation, but also adapt to changes in operating states such as modulation and three-phase imbalance.

[0009] In one optional implementation, obtaining the converter's reference vector and its corresponding zero common-mode vector subset includes: Obtain the target sector corresponding to the reference vector; Based on the target sector, a subset of zero common-mode vectors corresponding to the reference vector is determined from a pre-determined set of zero common-mode vectors. The set of zero common-mode vectors includes multiple intermediate vectors and zero vectors corresponding to the converter. Each intermediate vector has a corresponding direction and amplitude and is distributed in different sectors. The common-mode voltage of multiple intermediate vectors and zero vectors is zero.

[0010] The converter control method provided in this embodiment determines the corresponding zero common-mode vector subset according to the target sector corresponding to the reference vector, so that the zero common-mode vector participating in the construction of the virtual vector can match the spatial position of the current reference vector, thereby improving the modulation accuracy of the virtual vector on the target voltage.

[0011] In one alternative implementation, the converter operates based on the adjusted virtual vector control, including: Based on the adjusted virtual vector, the corresponding three-phase modulation signal is generated, which includes the voltage modulation amount corresponding to each converter. Based on the three-phase modulation signal, determine the duty cycle of each phase arm of the converter; Drive signals are generated based on the duty cycle, and the converter operation is controlled based on the drive signals.

[0012] The converter control method provided in this embodiment generates a three-phase modulation signal based on the adjusted virtual vector, and further determines the duty cycle corresponding to each phase bridge arm and generates a drive signal. This realizes the conversion from virtual vector to converter switching device control signal, so that the zero common-mode and midpoint voltage regulation effect corresponding to the adjusted virtual vector can be applied to the actual operation of the converter, thereby improving the converter's common-mode voltage suppression capability and midpoint voltage balance capability.

[0013] In one optional implementation, determining the duty cycle corresponding to each phase arm of the converter based on the three-phase modulation signal includes: The voltage modulation amounts of each phase in the three-phase modulation signal are sorted. Based on the preset modulation relationship table and the sorting results, the duty cycle corresponding to each phase arm of the converter is determined.

[0014] The converter control method provided in this embodiment determines the three-phase modulation signal by a virtual vector adjusted by the midpoint, and determines the arm duty cycle by sorting the three-phase voltage modulation amount. This allows the preset combination coefficient of the zero common-mode vector and the midpoint adjustment coefficient to be transmitted to the actual switching control process, thereby improving the balance capability of the DC side midpoint voltage while outputting low common-mode voltage.

[0015] In one optional implementation, adjusting a preset combination coefficient according to a midpoint adjustment coefficient to obtain an adjusted virtual vector includes: Obtain the preset combination coefficients corresponding to the zero common mode vector subset; The preset combination coefficients are corrected based on the midpoint adjustment coefficient to obtain the corrected combination coefficients; Based on the corrected combination coefficients, the zero common mode vectors are combined to obtain the adjusted virtual vector.

[0016] The converter control method provided in this embodiment modifies the preset combination coefficient based on the midpoint adjustment coefficient, so that the interaction ratio between the zero common-mode vectors can be dynamically adjusted according to the midpoint voltage state of the DC side; based on the modified combination coefficient, the zero common-mode vectors are recombined, so that the adjusted virtual vectors maintain the zero common-mode characteristics while changing the effect of the midpoint current corresponding to the virtual vectors, thereby improving the DC side midpoint voltage balance capability.

[0017] In one alternative implementation, the method further includes: Obtain the current information of each phase of the converter, and obtain the preset dead time corresponding to the power switching devices in the converter; Based on the preset dead time and the current information of each phase, the midpoint current deviation caused by the preset dead time is determined. Based on the midpoint current deviation, the midpoint adjustment coefficient is corrected, and the corrected midpoint adjustment coefficient is used to adjust the preset combination coefficient.

[0018] The converter control method provided in this embodiment determines the midpoint current deviation caused by the dead zone based on the preset dead time of the converter power switching devices and the current information of each phase, and corrects the midpoint adjustment coefficient based on the midpoint current deviation. This allows the influence of the non-ideal characteristics of the power switching devices on the midpoint current to be considered during the virtual vector construction process, thereby improving the accuracy of the midpoint adjustment coefficient, reducing the midpoint voltage offset caused by the dead zone effect, and improving the DC side midpoint voltage balance capability.

[0019] In a second aspect, the present invention provides a converter control device, the device comprising: The acquisition module is used to acquire the reference vector of the converter and its corresponding zero common-mode vector subset; the reference vector is used to characterize the magnitude and direction of the target voltage expected to be output by the converter at the current moment, and the zero common-mode vector subset includes multiple zero common-mode vectors used to construct virtual vectors; The combination module is used to combine each zero common mode vector using preset combination coefficients to obtain a virtual vector; the preset combination coefficients are determined based on the angle of the reference vector. The adjustment module is used to take the voltage deviation on the DC side of the converter as the input of PID control to obtain the PID adjustment term; The determination module is used to determine the midpoint adjustment coefficient based on the PID control term and the preset benchmark adjustment coefficient; The adjustment module is used to adjust the preset combination coefficients according to the midpoint adjustment coefficient to obtain the adjusted virtual vector; The control module is used to control the operation of the converter based on the adjusted virtual vector control.

[0020] Thirdly, the present invention provides an electronic device, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the converter control method of the first aspect or any corresponding embodiment described above.

[0021] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the converter control method of the first aspect or any corresponding embodiment thereof.

[0022] Fifthly, the present invention provides a computer program product, including computer instructions for causing a computer to execute the converter control method of the first aspect or any corresponding embodiment described above.

[0023] It should be understood that the beneficial effects of the converter control device, electronic device, storage medium and program product involved in the embodiments of the present invention can be found in the corresponding beneficial effect description of the converter control method shown above, and will not be repeated here. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic flowchart of a first type of converter control method according to an embodiment of the present invention; Figure 2 This is a second flowchart illustrating the converter control method according to an embodiment of the present invention; Figure 3 This is a third flowchart of the converter control method according to an embodiment of the present invention; Figure 4 This is a structural block diagram of a converter control device according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] With the development of power electronic conversion technology, converters are widely used in new energy power generation, energy storage systems, motor drives, and grid-connected conversion scenarios because they can reduce the voltage stress on power devices and improve the output voltage waveform quality. During converter operation, modulation strategies are usually used to control the on / off state of power switching devices to ensure that the converter output AC voltage meets the target requirements.

[0029] Control methods based on Space Vector Pulse Width Modulation (SVPWM) or Sinusoidal Pulse Width Modulation (SPWM), while achieving AC voltage output control, will generate a common-mode voltage (CMV) at the converter output that varies with the switching state. This CMV may cause problems such as shaft current, bearing electrolytic corrosion, and deterioration of motor insulation performance in the motor drive system; at the same time, it may also lead to increased electromagnetic interference (EMI) and leakage current, thereby affecting the system's operational stability.

[0030] Furthermore, for three-level converters employing a split DC capacitor structure, the DC side typically includes an upper capacitor and a lower capacitor connected in series. During the charging and discharging process, the upper and lower capacitors may exhibit inconsistent charging and discharging due to factors such as the switching state of power devices and current changes, leading to a shift in the DC side midpoint voltage. This midpoint voltage imbalance further causes output voltage waveform distortion and increased harmonic content, while also subjecting power devices to unbalanced voltage stress, thus affecting the converter's operational reliability.

[0031] To address the aforementioned issues, related technologies typically reduce the impact of common-mode voltage by incorporating hardware structures such as filters and isolation transformers. However, this approach increases system cost, size, and structural complexity. Another example is reducing common-mode voltage through improved modulation strategies, including virtual vector modulation and zero-sequence voltage injection. However, these technologies often struggle to simultaneously achieve common-mode voltage suppression and DC-side midpoint voltage balance control, and some methods still suffer from insufficient common-mode voltage reduction to zero or inadequate midpoint regulation capability. Therefore, this application proposes a converter control method that can simultaneously address common-mode voltage suppression and midpoint potential balance, thereby improving converter operational stability.

[0032] According to an embodiment of the present invention, a converter control method embodiment is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0033] The converter control method provided in this application can be applied to power electronic systems that require DC-AC power conversion, such as new energy power generation systems, energy storage systems, and motor drive systems. For example, it can be applied to photovoltaic grid-connected inverters, wind power converters, energy storage converters, and AC motor drive devices.

[0034] This embodiment provides a converter control method, which can be used in the aforementioned power electronic conversion systems, such as new energy power generation systems, energy storage systems, and motor drive systems. Figure 1 This is a flowchart of a converter control method according to an embodiment of the present invention, such as... Figure 1 As shown, the process includes the following steps: Step S101: Obtain the reference vector of the converter and its corresponding zero common-mode vector subset; the reference vector is used to characterize the magnitude and direction of the target voltage expected to be output by the converter at the current moment, and the zero common-mode vector subset includes multiple zero common-mode vectors used to construct virtual vectors.

[0035] The reference vector is used to characterize the magnitude and direction of the target voltage that the converter is expected to output at the current moment. Specifically, the reference vector is used to describe the state of the target output voltage on the AC side of the converter, and it contains the magnitude and phase direction information of the target output voltage.

[0036] A virtual vector is an equivalent voltage vector obtained by combining multiple vectors that meet preset conditions in a certain proportion. Optionally, this embodiment uses multiple zero common-mode vectors to combine, and the multiple zero common-mode vectors act together in a corresponding proportion to produce an output voltage effect equivalent to the reference vector, thereby forming a virtual vector. Here, a zero common-mode vector refers to a vector that the converter can output with a corresponding zero common-mode voltage. The converter can form multiple output voltage states with different amplitudes and directions by controlling the conduction states of different power switching devices. Different output states correspond to different common-mode voltages. Some of the intermediate and zero common-mode vectors have zero common-mode voltages. These voltage vectors that meet the condition of zero common-mode voltage are used as zero common-mode vectors. Since the zero common-mode vector does not generate additional common-mode voltage during its operation, this embodiment can reduce the common-mode voltage of the converter by combining zero common-mode vectors to form a virtual vector.

[0037] Step S102: Combine each zero common mode vector using preset combination coefficients to obtain a virtual vector; the preset combination coefficients are determined based on the angle of the reference vector.

[0038] The preset combination coefficient is used to characterize the initial combination ratio among the zero-common-mode vectors constituting the virtual vector. In this embodiment, since the reference vector has different angular positions within the target sector, the corresponding adjacent zero-common-mode vectors have different degrees of influence on the synthesis of the reference vector. Therefore, the combination coefficient can be determined based on the angle of the reference vector within the target sector. Determine weighting factors And based on weighting factors Generate preset combination coefficients. Preset combination coefficients are used to characterize the initial combination relationship between multiple zero common mode vectors, so that each zero common mode vector participates in the construction of virtual vectors according to its corresponding role ratio.

[0039] Based on preset combination coefficients, the proportions of multiple zero common-mode vectors within a control cycle are controlled, allowing these vectors to jointly participate in the synthesis of the converter's output voltage. Since the converter can control the on / off states of different power switching devices, allowing different zero common-mode vectors to act on the output process separately, the output voltage effects corresponding to each zero common-mode vector are superimposed according to their proportions. Therefore, the combined effect of combining these zero common-mode vectors using preset combination coefficients can be equivalent to a new voltage vector, thus obtaining a virtual vector.

[0040] Step S103: Use the voltage deviation on the DC side of the converter as the input for PID control to obtain the PID adjustment term.

[0041] The voltage deviation on the DC side of the converter is used to characterize the degree of voltage imbalance on the DC side. The DC side of a three-level converter typically employs a split capacitor structure formed by an upper and lower capacitor connected in series. The connection point between the two capacitors serves as the DC side midpoint. Generally, the voltages of the upper and lower capacitors should remain equal to ensure a stable midpoint voltage. However, when the two capacitors have different voltages due to inconsistent charging and discharging, a corresponding voltage deviation will occur. Therefore, this embodiment obtains the DC side voltage deviation by collecting the voltages of the upper and lower capacitors on the DC side of the converter and calculating the difference between them. This voltage deviation reflects the current direction and degree of midpoint voltage offset, providing feedback for subsequent midpoint adjustment.

[0042] Using the DC-side voltage deviation as the input to PID control means inputting the currently detected midpoint voltage imbalance into the PID control process, so that the PID control can calculate the corresponding adjustment amount based on the magnitude, cumulative change and trend of the voltage deviation, thereby obtaining the PID control term used to characterize the midpoint voltage adjustment requirement.

[0043] Step S104: Determine the midpoint adjustment coefficient based on the PID control term and the preset benchmark adjustment coefficient.

[0044] The reference adjustment coefficient is used to provide a basic adjustment value for the midpoint adjustment coefficient, thereby determining the initial value of the midpoint adjustment coefficient under ideal symmetrical operating conditions. In this embodiment, the reference adjustment coefficient is set to 1 / 3. Under ideal symmetrical operating conditions, the midpoint adjustment coefficient takes the basic value corresponding to the reference adjustment coefficient, and based on the preset combination coefficient determined by the direction angle of the reference vector, multiple zero common-mode vectors are combined to make the average midpoint current corresponding to the formed virtual vector approach zero, thereby maintaining the balance of the DC side midpoint voltage when there is no midpoint voltage deviation, while maintaining the zero common-mode characteristics of the virtual vector.

[0045] Optionally, during the actual operation of a three-level converter, the charging and discharging processes of the upper and lower capacitors on the DC side may be inconsistent due to the conduction states of different power switching devices and load changes, leading to a midpoint voltage deviation. When a midpoint voltage deviation occurs during actual operation, the PID control term is determined based on the midpoint voltage deviation, and the reference control coefficient is corrected to obtain the corresponding midpoint control coefficient. This midpoint control coefficient is used to adjust the combination ratio between multiple zero common-mode vectors in the virtual vector, thereby changing the effect of the midpoint current generated during the action of each zero common-mode vector, and achieving indirect regulation of the DC side midpoint voltage.

[0046] Compared to constructing virtual vectors using a fixed combination ratio, this implementation can dynamically adjust the action ratio of each zero common-mode vector within the virtual vector according to the actual operating state of the converter. This allows the virtual vector to maintain zero common-mode characteristics while generating a neutral-point current that is beneficial for neutral-point voltage recovery, thereby improving the balance capability of the DC-side neutral-point voltage.

[0047] Step S105: Adjust the preset combination coefficient according to the midpoint adjustment coefficient to obtain the adjusted virtual vector.

[0048] Adjusting the preset combination coefficients based on the midpoint adjustment coefficient refers to modifying the initial combination relationship (preset combination coefficients) used to construct the virtual vector according to the adjustment requirements corresponding to the DC-side midpoint voltage deviation. Since the virtual vector is formed by combining multiple zero-common-mode vectors in a certain proportion, changing the preset combination coefficients alters the proportion of each zero-common-mode vector in the virtual vector, thereby changing the effect of the midpoint current corresponding to the virtual vector. Therefore, by recombining the zero-common-mode vectors based on the adjusted combination proportions, the adjusted virtual vector can be obtained, enabling dynamic adjustment of the DC-side midpoint voltage while maintaining the zero-common-mode characteristics.

[0049] Step S106: Operate the converter based on the adjusted virtual vector control.

[0050] Based on the adjusted virtual vector, a corresponding control signal is generated, and the control signal is used to control the power switching devices in the converter to switch on and off, so that the converter output voltage state corresponds to the adjusted virtual vector, thereby achieving dynamic adjustment of the DC side midpoint voltage while meeting the output voltage control requirements.

[0051] The converter control method provided in this embodiment obtains a subset of zero common-mode vectors corresponding to the converter reference vector, and determines a preset combination coefficient based on the reference vector angle. Multiple zero common-mode vectors are combined to form a virtual vector, enabling the converter to achieve voltage output control based on the zero common-mode vector, thereby reducing the common-mode voltage during converter operation. The PID regulation term is determined according to the voltage deviation on the DC side of the converter, and the midpoint regulation coefficient is obtained by combining the reference regulation coefficient. The combination ratio between the zero common-mode vectors in the virtual vector is dynamically adjusted through the midpoint regulation coefficient, so that the virtual vector maintains the zero common-mode characteristics while adjusting the effect of the midpoint current according to the DC side midpoint voltage state, thereby improving the problem of voltage imbalance between the upper and lower capacitors on the DC side and improving the midpoint voltage stability during converter operation.

[0052] This embodiment provides a converter control method, which can be used in the aforementioned power electronic conversion systems, such as new energy power generation systems, energy storage systems, and motor drive systems. Figure 2 This is a flowchart of a converter control method according to an embodiment of the present invention, such as... Figure 2 As shown, the process includes the following steps: Step S201: Obtain the converter's reference vector and its corresponding zero common-mode vector subset. The reference vector characterizes the amplitude and direction of the target voltage expected to be output by the converter at the current moment. The zero common-mode vector subset includes multiple zero common-mode vectors used to construct virtual vectors. For details, please refer to... Figure 1 Step S101 of the illustrated embodiment will not be described again here.

[0053] Step S202: Combine the zero common-mode vectors using preset combination coefficients to obtain a virtual vector; the preset combination coefficients are determined based on the angle of the reference vector. For details, please refer to [link to relevant documentation]. Figure 1 Step S102 of the illustrated embodiment will not be described again here.

[0054] Step S203: The voltage deviation on the DC side of the converter is used as the input to the PID control to obtain the PID adjustment term. For details, please refer to [link to relevant documentation]. Figure 1 Step S103 of the illustrated embodiment will not be described again here.

[0055] Step S204: Determine the midpoint adjustment coefficient based on the PID control term and the preset benchmark adjustment coefficient.

[0056] Specifically, step S204 includes: Step S2041: Adjust the preset reference adjustment coefficient based on the PID adjustment term to obtain the adjusted reference adjustment coefficient.

[0057] The midpoint regulation coefficient is obtained by correcting the reference regulation coefficient based on the PID control term. The midpoint regulation coefficient is used to reflect the current midpoint voltage regulation requirement and further adjusts the combination ratio between the zero common-mode vectors in the virtual vector to change the effect of the midpoint current and achieve dynamic balance of the DC side midpoint voltage.

[0058] Step S2042: Determine the compensation item based on the operating status of the converter.

[0059] Considering that the operating status of the converter affects the neutral point voltage regulation effect, corresponding compensation items are determined based on the operating status of the converter. For example, the corresponding parameters for the operating status may include parameters such as modulation index and degree of imbalance, and the corresponding compensation amount is determined based on these parameters. For instance, the modulation index compensation amount is determined based on the converter's modulation index, and the imbalance compensation amount is determined based on the degree of three-phase imbalance of the converter. These compensation amounts are then combined to obtain the compensation item.

[0060] Step S2043: Based on the compensation term, compensate the adjusted benchmark adjustment coefficient to obtain the midpoint adjustment coefficient.

[0061] The PID control term is obtained based on the DC-side voltage deviation to reflect the feedback regulation requirements corresponding to the current neutral point voltage offset. A compensation term is determined based on the current operating state of the converter to compensate for the influence of factors such as modulation index and three-phase imbalance on the neutral point current. The preset reference regulation coefficient is corrected based on the PID control term and the compensation term to obtain the neutral point regulation coefficient. This neutral point regulation coefficient is determined by the following formula: .

[0062] In the above formula, This is the midpoint adjustment coefficient. As the benchmark adjustment coefficient, For PID control term, This is a compensation item. Among them, This refers to the voltage deviation on the DC side of the converter. The proportional adjustment parameter is used to adjust the intensity of the instantaneous adjustment corresponding to the current DC-side upper and lower capacitor voltage deviation. This is an integral control parameter used to adjust the voltage based on the cumulative change in voltage deviation, in order to eliminate steady-state deviations that may occur during long-term operation. This is a differential adjustment parameter used to make advance adjustments based on the changing trend of voltage deviation, thereby improving system stability. For the modulation of the converter, To adjust the coupling gain of the system, Three-phase unbalance is used to characterize the degree of imbalance between three-phase currents or three-phase voltages. This is the unbalanced compensation coefficient.

[0063] This embodiment introduces a compensation term related to the modulation scheme. The reference modulation coefficient is feedforward-corrected based on the current modulation scheme, enabling the converter to have higher midpoint regulation sensitivity under low modulation scheme operation and improving the midpoint voltage regulation capability under different modulation scheme operating conditions. Furthermore, when the converter has three-phase current imbalance or load asymmetry, the effect of the zero common-mode vector corresponding to each phase current on the midpoint current may change asymmetrically. In this case, feedback regulation based solely on the DC-side voltage deviation may have a certain response lag. Therefore, this embodiment determines the imbalance compensation amount based on the three-phase imbalance degree and uses the imbalance compensation amount to feedforward-correct the midpoint regulation coefficient, allowing the midpoint regulation coefficient to adjust with changes in the three-phase operating state. This reduces the adverse impact of the midpoint current bias caused by the three-phase imbalance on the midpoint voltage recovery process and improves the dynamic balance capability of the midpoint voltage.

[0064] The converter control method provided in this embodiment adjusts a preset reference adjustment coefficient based on a PID adjustment term determined by the DC-side voltage deviation, so that the adjusted reference adjustment coefficient can reflect the feedback adjustment requirements corresponding to the current midpoint voltage deviation. A compensation term is determined according to the operating state of the converter, and the compensation term is used to further correct the reference adjustment coefficient after PID adjustment, so that the final midpoint adjustment coefficient can not only respond to the DC-side midpoint voltage deviation, but also adapt to changes in operating states such as modulation and three-phase imbalance.

[0065] Step S205: Adjust the preset combination coefficient according to the midpoint adjustment coefficient to obtain the adjusted virtual vector.

[0066] Specifically, step S205 includes: Step S2051: Obtain the preset combination coefficients corresponding to the zero common mode vector subset.

[0067] Optionally, a preset combination coefficient is determined based on the direction angle of the reference vector. The preset combination coefficient is used to determine the initial combination ratio of the virtual vector, and the midpoint adjustment coefficient k is used to adjust the initial combination ratio (preset combination coefficient) based on the DC side midpoint voltage deviation and the converter operating status. The two together determine the final action ratio of each zero common mode vector in the virtual vector.

[0068] Step S2052: Based on the midpoint adjustment coefficient, the preset combination coefficient is corrected to obtain the corrected combination coefficient.

[0069] The combination relationship corresponding to the preset combination coefficient is adjusted according to the midpoint adjustment coefficient to obtain the corrected combination coefficient, so as to change the proportion of multiple zero common mode vectors in the virtual vector construction process.

[0070] Step S2053: Based on the corrected combination coefficients, combine each zero common mode vector to obtain the adjusted virtual vector.

[0071] Based on the modified combination coefficients, the zero-common-mode vectors in the subset of zero-common-mode vectors are weighted and combined to obtain the adjusted virtual vector. The modified combination coefficients characterize the final contribution ratio of each zero-common-mode vector in the virtual vector construction process. By combining multiple zero-common-mode vectors according to the modified combination coefficients, the zero-common-mode vectors are synthesized into the adjusted virtual vector. The virtual vector is determined by the following formula: .

[0072] In the above formula, For virtual vectors, It can form a preset combination coefficient. , as well as These are the zero common-mode vectors in the zero common-mode vector subset.

[0073] The converter control method provided in this embodiment modifies the preset combination coefficient based on the midpoint adjustment coefficient, so that the interaction ratio between the zero common-mode vectors can be dynamically adjusted according to the midpoint voltage state of the DC side; based on the modified combination coefficient, the zero common-mode vectors are recombined, so that the adjusted virtual vectors maintain the zero common-mode characteristics while changing the effect of the midpoint current corresponding to the virtual vectors, thereby improving the DC side midpoint voltage balance capability.

[0074] Step S206: Operate the converter based on the adjusted virtual vector control.

[0075] This embodiment provides a converter control method, which can be used in the aforementioned power electronic conversion systems, such as new energy power generation systems, energy storage systems, and motor drive systems. Figure 3 This is a flowchart of a converter control method according to an embodiment of the present invention, such as... Figure 3 As shown, the process includes the following steps: Step S301: Obtain the reference vector of the converter and its corresponding zero common-mode vector subset; the reference vector is used to characterize the magnitude and direction of the target voltage expected to be output by the converter at the current moment, and the zero common-mode vector subset includes multiple zero common-mode vectors used to construct virtual vectors.

[0076] Specifically, step S301 includes: Step S3011: Obtain the target sector corresponding to the reference vector.

[0077] The reference vector is used to characterize the magnitude and direction of the target voltage that the converter expects to output at the current moment. Based on the direction angle corresponding to the reference vector, the spatial region where the reference vector is located can be determined, and this spatial region can be defined as the target sector. This target sector is used to characterize the positional relationship of the reference vector in the space vector plane, so as to determine the zero common-mode vector subset corresponding to the reference vector based on the target sector.

[0078] Step S3012: Based on the target sector, determine the zero common-mode vector subset corresponding to the reference vector from the predetermined zero common-mode vector set; the zero common-mode vector set includes multiple intermediate vectors and zero vectors corresponding to the converter, each intermediate vector has a corresponding direction and amplitude, and is distributed in different sectors, and the common-mode voltage of multiple intermediate vectors and zero vectors is zero.

[0079] Optionally, based on the spatial direction corresponding to each median vector, the correspondence between each median vector and different sectors is predetermined. After obtaining the target sector corresponding to the reference vector, the median vectors corresponding to the target sector are selected from the zero common-mode vector set according to the correspondence, and combined with the zero vectors to form a subset of zero common-mode vectors corresponding to the reference vector.

[0080] The converter control method provided in this embodiment determines the corresponding zero common-mode vector subset according to the target sector corresponding to the reference vector, so that the zero common-mode vector participating in the construction of the virtual vector can match the spatial position of the current reference vector, thereby improving the modulation accuracy of the virtual vector on the target voltage.

[0081] Step S302: Combine the zero common-mode vectors using preset combination coefficients to obtain a virtual vector; the preset combination coefficients are determined based on the angle of the reference vector. For details, please refer to [link to relevant documentation]. Figure 1 Step S102 of the illustrated embodiment will not be described again here.

[0082] Step S303: The voltage deviation on the DC side of the converter is used as the input to the PID control to obtain the PID adjustment term. For details, please refer to [link to relevant documentation]. Figure 1 Step S103 of the illustrated embodiment will not be described again here.

[0083] Step S304: Determine the midpoint adjustment coefficient based on the PID control term and the preset baseline adjustment coefficient. For details, please refer to [link to relevant documentation]. Figure 2 Step S204 of the illustrated embodiment will not be described again here.

[0084] Step S305: Adjust the preset combination coefficients according to the midpoint adjustment coefficient to obtain the adjusted virtual vector. For details, please refer to [link to relevant documentation]. Figure 2 Step S205 of the illustrated embodiment will not be described again here.

[0085] Step S306: Operate the converter based on the adjusted virtual vector control.

[0086] Specifically, step S306 includes: Step S3061: Generate the corresponding three-phase modulation signal based on the adjusted virtual vector. The three-phase modulation signal includes the voltage modulation amount corresponding to each converter.

[0087] Based on the adjusted virtual vector, the corresponding three-phase voltage modulation information is determined, and a three-phase modulation signal is generated. The three-phase modulation signal includes voltage modulation amounts corresponding to the three-phase bridge arms of the converter. These voltage modulation amounts characterize the adjustment target of the output voltage of each phase, thereby controlling the conduction state of the corresponding power switching devices in the converter.

[0088] Step S3062: Based on the three-phase modulation signal, determine the duty cycle corresponding to each phase arm of the converter.

[0089] In some optional implementations, step S3062 above includes: Step a1: Sort the voltage modulation amounts of each phase in the three-phase modulation signal.

[0090] Step a2: Based on the preset modulation relationship table and the sorting results, determine the duty cycle corresponding to each phase arm of the converter.

[0091] The corresponding voltage modulation amounts in the three-phase modulation signals are compared and sorted to determine the relative magnitude relationship between the voltage modulation amounts of each phase.

[0092] Based on the sorting results of the voltage modulation quantities, the preset modulation relationship table is consulted to determine the duty cycle corresponding to each phase arm of the converter. The preset modulation relationship table characterizes the correspondence between different voltage modulation quantity sorting relationships and the arm duty cycles. By determining the corresponding duty cycle allocation method based on the current sorting results of the three-phase voltage modulation quantities, the converter operates according to the modulation requirements corresponding to the adjusted virtual vector.

[0093] The converter control method provided in this embodiment determines the three-phase modulation signal by a virtual vector adjusted by the midpoint, and determines the arm duty cycle by sorting the three-phase voltage modulation amount. This allows the preset combination coefficient of the zero common-mode vector and the midpoint adjustment coefficient to be transmitted to the actual switching control process, thereby improving the balance capability of the DC side midpoint voltage while outputting low common-mode voltage.

[0094] Step S3063: Generate a drive signal based on the duty cycle, and control the operation of the converter based on the drive signal.

[0095] Based on the duty cycle of each phase arm, the turn-on and turn-off times of each power switching device are determined, and corresponding drive signals are generated. By applying the drive signals to the power switching devices of the converter, coordinated control of the common-mode voltage and the DC-side midpoint voltage is achieved.

[0096] The converter control method provided in this embodiment generates a three-phase modulation signal based on the adjusted virtual vector, and further determines the duty cycle corresponding to each phase bridge arm and generates a drive signal. This realizes the conversion from virtual vector to converter switching device control signal, so that the zero common-mode and midpoint voltage regulation effect corresponding to the adjusted virtual vector can be applied to the actual operation of the converter, thereby improving the converter's common-mode voltage suppression capability and midpoint voltage balance capability.

[0097] In some alternative implementations, the method further includes: Step b1: Obtain the current information of each phase of the converter, and obtain the preset dead time corresponding to the power switching devices in the converter; Step b2: Based on the preset dead time and the current information of each phase, determine the midpoint current deviation caused by the preset dead time; Step b3: Based on the midpoint current deviation, the midpoint adjustment coefficient is corrected, and the corrected midpoint adjustment coefficient is used to adjust the preset combination coefficient.

[0098] In actual operation, due to the dead time of the power switching devices in the converter, an additional freewheeling process is generated during the switching of the upper and lower switching devices on the same bridge arm. This causes the actual midpoint current to deviate from the ideal modulation state, resulting in midpoint voltage regulation error. At the same time, since the virtual vector is mainly formed by the combination of zero common-mode midpoint vectors, the asymmetric freewheeling current caused by the dead time will generate midpoint current bias in different directions under different phase current directions, resulting in cumulative offset of the midpoint voltage.

[0099] To reduce the impact of the aforementioned dead-time effect on midpoint voltage regulation, this embodiment acquires the current information of each phase of the converter and the preset dead-time corresponding to the power switching devices. Based on the preset dead-time and the current direction information of each phase, the midpoint current deviation caused by the dead-time is determined. Specifically, the midpoint current deviation can be expressed as: .

[0100] in, This indicates the preset dead time corresponding to the power switching device. This indicates the switching frequency of the power switching device. This indicates that the phase current is drawn from the midpoint. This represents the midpoint current deviation.

[0101] The midpoint adjustment coefficient is corrected based on the midpoint current deviation to compensate for the midpoint current offset caused by the dead zone effect. The corrected midpoint adjustment coefficient is determined by the following formula: .

[0102] in, This is the midpoint adjustment coefficient. The reference current used for normalization. This is the corrected midpoint adjustment coefficient. Based on Adjusting the combination relationship between zero common-mode vectors allows the virtual vectors to maintain zero common-mode characteristics while offsetting the midpoint current offset caused by the dead zone effect, thereby improving the voltage balance capability of the upper and lower capacitors on the DC side.

[0103] The converter control method provided in this embodiment determines the midpoint current deviation caused by the dead zone based on the preset dead time of the converter power switching devices and the current information of each phase, and corrects the midpoint adjustment coefficient based on the midpoint current deviation. This allows the influence of the non-ideal characteristics of the power switching devices on the midpoint current to be considered during the virtual vector construction process, thereby improving the accuracy of the midpoint adjustment coefficient, reducing the midpoint voltage offset caused by the dead zone effect, and improving the DC side midpoint voltage balance capability.

[0104] This embodiment also provides a converter control device for implementing the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0105] This embodiment provides a converter control device, such as... Figure 4 As shown, it includes: The acquisition module 401 is used to acquire the reference vector of the converter and its corresponding zero common-mode vector subset; the reference vector is used to characterize the magnitude and direction of the target voltage expected to be output by the converter at the current moment, and the zero common-mode vector subset includes multiple zero common-mode vectors used to construct virtual vectors.

[0106] The combination module 402 is used to combine each zero common mode vector with preset combination coefficients to obtain a virtual vector; the preset combination coefficients are determined based on the angle of the reference vector.

[0107] The adjustment module 403 is used to take the voltage deviation on the DC side of the converter as the input of PID control to obtain the PID adjustment term.

[0108] The determination module 404 is used to determine the midpoint adjustment coefficient based on the PID adjustment term and the preset benchmark adjustment coefficient.

[0109] The adjustment module 405 is used to adjust the preset combination coefficients according to the midpoint adjustment coefficient to obtain the adjusted virtual vector.

[0110] Control module 406 is used to control the operation of the converter based on the adjusted virtual vector control.

[0111] In some optional implementations, the determining module 404 is further configured to adjust a preset reference adjustment coefficient based on the PID adjustment term to obtain the adjusted reference adjustment coefficient; determine a compensation term according to the operating state of the converter; and compensate the adjusted reference adjustment coefficient based on the compensation term to obtain the midpoint adjustment coefficient.

[0112] In some optional implementations, the acquisition module 401 is further configured to acquire the target sector corresponding to the reference vector; based on the target sector, determine the zero common-mode vector subset corresponding to the reference vector from a predetermined set of zero common-mode vectors; the set of zero common-mode vectors includes multiple intermediate vectors and zero vectors corresponding to the converter, each intermediate vector having a corresponding direction and amplitude, and distributed in different sectors, and the common-mode voltage of the multiple intermediate vectors and zero vectors is zero.

[0113] In some optional implementations, the control module 406 is further configured to generate a corresponding three-phase modulation signal based on the adjusted virtual vector, the three-phase modulation signal including the voltage modulation amount corresponding to each phase of the converter; determine the duty cycle corresponding to each phase arm of the converter based on the three-phase modulation signal; generate a drive signal based on the duty cycle; and control the operation of the converter based on the drive signal.

[0114] In some alternative implementations, the converter control device further includes: The duty cycle determination module is used to sort the voltage modulation amounts of each phase in the three-phase modulation signal; based on the preset modulation relationship table and the sorting results, it determines the duty cycle corresponding to each phase arm of the converter.

[0115] In some optional implementations, the adjustment module 405 is further configured to obtain the preset combination coefficients corresponding to the subset of zero common mode vectors; correct the preset combination coefficients according to the midpoint adjustment coefficient to obtain the corrected combination coefficients; and combine each zero common mode vector based on the corrected combination coefficients to obtain the adjusted virtual vector.

[0116] In some alternative implementations, the converter control device further includes: The dead-time adjustment module is used to acquire the current information of each phase of the converter and the preset dead time corresponding to the power switching devices in the converter; based on the preset dead time and the current information of each phase, it determines the midpoint current deviation caused by the preset dead time; based on the midpoint current deviation, it corrects the midpoint adjustment coefficient, and the corrected midpoint adjustment coefficient is used to adjust the preset combination coefficient.

[0117] The converter control device provided in this embodiment of the invention can execute the converter control method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects for executing the method. Further functional descriptions of the various modules and units described above are the same as in the corresponding embodiments described above, and will not be repeated here.

[0118] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention.

[0119] The following is a detailed reference. Figure 5The diagram illustrates a structural schematic suitable for implementing an electronic device according to embodiments of the present invention. The electronic device may include a processor (e.g., a central processing unit, graphics processor, etc.) 501, which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 502 or a program loaded from memory 508 into random access memory (RAM) 503. The RAM 503 also stores various programs and data required for the operation of the electronic device. The processor 501, ROM 502, and RAM 503 are interconnected via a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.

[0120] Typically, the following devices can be connected to I / O interface 505: input devices 506 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 507 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; memory devices 508 including, for example, magnetic tapes, hard disks, etc.; and communication devices 509. Communication device 509 allows electronic devices to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 5 Electronic devices with various devices are shown, but it should be understood that it is not required to implement or have all of the devices shown, and more or fewer devices may be implemented or have instead.

[0121] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 509, or installed from a memory 508, or installed from a ROM 502. When the computer program is executed by the processor 501, it performs the functions defined in the converter control method of the embodiments of the present invention.

[0122] Figure 5 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of the embodiments of the present invention.

[0123] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code. When the software or computer code is accessed and executed by the computer, processor, or hardware, the converter control method shown in the above embodiments is implemented.

[0124] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0125] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A converter control method, characterized in that, The method includes: Obtain the reference vector of the converter and its corresponding zero common-mode vector subset; the reference vector is used to characterize the amplitude and direction of the target voltage expected to be output by the converter at the current moment, and the zero common-mode vector subset includes multiple zero common-mode vectors used to construct virtual vectors; The virtual vector is obtained by combining the zero common mode vectors using preset combination coefficients; the preset combination coefficients are determined based on the angle of the reference vector. The voltage deviation on the DC side of the converter is used as the input to the PID control to obtain the PID adjustment term; Based on the PID control term and the preset benchmark control coefficient, the midpoint control coefficient is determined; The preset combination coefficients are adjusted according to the midpoint adjustment coefficient to obtain the adjusted virtual vector; The converter is operated based on the adjusted virtual vector control.

2. The method according to claim 1, characterized in that, The determination of the midpoint adjustment coefficient based on the PID adjustment term and the preset benchmark adjustment coefficient includes: The preset benchmark adjustment coefficient is adjusted based on the PID adjustment term to obtain the adjusted benchmark adjustment coefficient; The compensation term is determined based on the operating status of the converter; Based on the compensation term, the adjusted benchmark adjustment coefficient is compensated to obtain the midpoint adjustment coefficient.

3. The method according to claim 1, characterized in that, The acquisition of the converter's reference vector and its corresponding zero common-mode vector subset includes: Obtain the target sector corresponding to the reference vector; Based on the target sector, a subset of zero common-mode vectors corresponding to the reference vector is determined from a predetermined set of zero common-mode vectors; the set of zero common-mode vectors includes multiple intermediate vectors and zero vectors corresponding to the converter, each intermediate vector having a corresponding direction and amplitude, and distributed in different sectors, and the common-mode voltage of multiple intermediate vectors and zero vectors is zero.

4. The method according to claim 1, characterized in that, The operation of the converter based on the adjusted virtual vector control includes: Based on the adjusted virtual vector, a corresponding three-phase modulation signal is generated, the three-phase modulation signal including the voltage modulation amount corresponding to each converter. Based on the three-phase modulation signal, the duty cycle corresponding to each phase arm of the converter is determined; A drive signal is generated based on the duty cycle, and the converter is controlled to operate based on the drive signal.

5. The method according to claim 4, characterized in that, The step of determining the duty cycle of each phase arm of the converter based on the three-phase modulation signal includes: The voltage modulation amounts of each phase in the three-phase modulation signal are sorted. Based on the preset modulation relationship table and the sorting results, the duty cycle corresponding to each phase arm of the converter is determined.

6. The method according to claim 1, characterized in that, The step of adjusting the preset combination coefficients according to the midpoint adjustment coefficient to obtain the adjusted virtual vector includes: Obtain the preset combination coefficients corresponding to the zero common mode vector subset; The preset combination coefficients are corrected based on the midpoint adjustment coefficient to obtain the corrected combination coefficients; Based on the corrected combination coefficients, the zero common mode vectors are combined to obtain the adjusted virtual vector.

7. The method according to claim 1, characterized in that, The method further includes: Obtain the phase current information of the converter and the preset dead time corresponding to the power switching devices in the converter; Based on the preset dead time and the current information of each phase, the midpoint current deviation caused by the preset dead time is determined. Based on the midpoint current deviation, the midpoint adjustment coefficient is corrected, and the corrected midpoint adjustment coefficient is used to adjust the preset combination coefficient.

8. A converter control device, characterized in that, The device includes: The acquisition module is used to acquire the reference vector of the converter and its corresponding zero common-mode vector subset; the reference vector is used to characterize the amplitude and direction of the target voltage expected to be output by the converter at the current moment, and the zero common-mode vector subset includes multiple zero common-mode vectors used to construct virtual vectors; The combination module is used to combine the zero common mode vectors using preset combination coefficients to obtain the virtual vector; the preset combination coefficients are determined based on the angle of the reference vector. The adjustment module is used to take the voltage deviation on the DC side of the converter as the input of PID control to obtain the PID adjustment term; The determination module is used to determine the midpoint adjustment coefficient based on the PID adjustment term and the preset benchmark adjustment coefficient; The adjustment module is used to adjust the preset combination coefficient according to the midpoint adjustment coefficient to obtain the adjusted virtual vector; A control module is used to control the operation of the converter based on the adjusted virtual vector.

9. An electronic device, characterized in that, include: A memory and a processor are communicatively connected, the memory stores computer instructions, and the processor executes the computer instructions to perform the converter control method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to perform the converter control method according to any one of claims 1 to 7.

11. A computer program product, characterized in that, Includes computer instructions for causing a computer to perform the converter control method according to any one of claims 1 to 7.

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