Method, device and equipment for suppression control of output voltage of grid-side converter and medium

Abstract

The invention provides a suppression control method, device and equipment for the output voltage of a grid-side converter and a medium. The suppression control method comprises the following steps: acquiring the output voltage of the grid side of the converter; judging whether a suppression program needs to be started or not according to the output voltage and a voltage preset threshold value; under the condition that it is judged that the suppression program needs to be started, the q-axis current and the d-axis current are adjusted according to the output voltage and a voltage preset threshold value, and on this basis, the q-axis current is adjusted according to the difference value between the d-axis current instruction and the d-axis actual current so as to reduce the output voltage. The technical problems that in the prior art, a method for restraining the output voltage of the grid-side converter is poor in restraining effect and high in cost are solved.

Description

Technical Field

[0001] The present invention relates to the field of power electronics technology, and in particular to a method for controlling the output voltage of a grid-side converter, a device for controlling the output voltage of a grid-side converter, an electronic device, and a readable storage medium. Background Art

[0002] Currently, grid-side converters, as efficient and flexible power electronic devices, are widely used in a variety of power conversion applications. Their role is becoming increasingly prominent, particularly in areas such as renewable energy, energy conservation, and emission reduction. However, in actual operation, grid-side converters may encounter complex operating conditions such as high grid impedance or grid voltage fluctuations. These conditions often cause the converter output voltage to rise, even exceeding the device's rated voltage range. If effective voltage suppression measures are not implemented promptly, the excessive voltage will not only damage the converter itself but may also cause failures in other equipment on the grid, potentially threatening the stable operation of the entire grid.

[0003] Currently, the industry has proposed several solutions to the problem of excessively high grid-side converter output voltage. For example, by adjusting the converter's control strategy and changing its output power factor, the output voltage can be reduced. However, this approach often affects the converter's operating efficiency and may not achieve the desired suppression effect under certain operating conditions. Another common approach is to add additional hardware devices, such as filters or transformers, to reduce the output voltage. However, this approach not only increases system cost and complexity but may also introduce new power quality issues. Summary of the Invention

[0004] The present invention solves the technical problems in the prior art of suppressing the output voltage of a grid-side converter, such as poor suppression effect and high cost.

[0005] To solve the above problems, the present invention provides a suppression control method for the output voltage of a grid-side converter, the suppression control method comprising: obtaining the output voltage of the converter grid side; judging whether it is necessary to start a suppression program based on the output voltage and a preset voltage threshold; and if it is judged that the suppression program needs to be started, adjusting the q-axis current and the d-axis current based on the output voltage and the preset voltage threshold to reduce the output voltage.

[0006] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: real-time monitoring of the voltage of the grid-side port of the grid-side converter, and using a voltage sensor on the grid side of the AC reactor to monitor the output voltage of the grid-side converter in real time. Based on the output voltage and a preset voltage threshold, the system determines whether the output voltage is too high, thereby determining whether to initiate a suppression program for the grid-side converter. If the grid-side converter suppression program is deemed necessary, the system adjusts the q-axis current and d-axis current, specifically adjusting the q-axis current based on the difference between the d-axis current command and the actual d-axis current, and then increasing the q-axis current using a PI regulator to achieve a rapid response and reduce the output voltage to below the preset voltage threshold. This effectively reduces the converter's output voltage and prevents damage to the grid or equipment caused by excessive voltage. Furthermore, the present invention addresses the shortcomings of the prior art and, incorporating the principles of motor field-weakening control, proposes a method for suppressing excessive output voltage of the grid-side converter based on limiting the square sum of the d-axis and q-axis currents. This method monitors the voltage at the grid-side port of the converter in real time and, when the voltage is excessive, dynamically adjusts the d-axis and q-axis currents so that their square sum does not exceed a predetermined limit, thereby effectively suppressing the rise in output voltage. This method is not only simple and easy to implement, but also effectively protects the grid-side converter and grid equipment from damage caused by excessive voltage without sacrificing the operating efficiency of the grid-side converter. At the same time, since no additional hardware equipment is required, the implementation cost of the present invention is relatively low.

[0007] In one embodiment of the present invention, when it is determined that the suppression program needs to be started, the q-axis current and the d-axis current are adjusted according to the output voltage and the voltage preset threshold to reduce the output voltage, including: when it is determined that the suppression program needs to be started, obtaining a voltage difference according to the output voltage and the voltage preset threshold ; Adjust the q-axis current according to the voltage difference to obtain the actual q-axis voltage that needs to be output; and adjust the output voltage according to the q-axis actual voltage. is the output voltage, Preset threshold for voltage, is the voltage difference.

[0008] In one example of the present invention, the q-axis current is adjusted according to the voltage difference to obtain the actual q-axis voltage that is actually required to be output, including: performing PI calculation on the voltage difference to obtain a d-axis current instruction; generating a d-axis actual current difference by subtracting the d-axis current instruction from the d-axis actual current; further calculating the q-axis current based on the d-axis current instruction and the d-axis actual current difference to obtain the q-axis actual current difference; and performing PI adjustment on the q-axis actual current difference to obtain the actual q-axis voltage that is actually required to be output.

[0009] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: when it is determined that the suppression program needs to be started, the q-axis current and the d-axis current are adjusted according to the output voltage and the voltage preset threshold to reduce the output voltage. Specifically, the voltage difference is calculated. ; For voltage difference Perform PI calculation to obtain the d-axis current instruction and set the d-axis current command The actual current of d axis Make a difference and get the actual current difference of d axis ;Will Through a proportional link with a proportional coefficient K, the value obtained by the proportional link is involved in the calculation of the q-axis current. and the actual current on the q axis The difference between the two values is further subtracted from the value obtained by the proportional link to obtain the actual current difference of the q axis. , in order to increase the q-axis current, thereby increasing the q-axis voltage and improving the response speed of the system. , through the PI regulator, adjust the q-axis current, thereby increasing the q-axis voltage, and finally the output voltage Less than the preset voltage threshold.

[0010] In one embodiment of the present invention, obtaining the output voltage of the converter grid side includes: obtaining the q-axis voltage and the d-axis voltage; calculating the phase voltage according to the q-axis voltage and the d-axis voltage as follows: ; Obtain output voltage according to phase voltage; Wherein, is the q-axis voltage, is the d-axis voltage, is the phase voltage.

[0011] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: obtaining the current q-axis voltage and d-axis voltage , in the control program, and The calculation results of the voltage loop can be obtained directly and their voltage square roots can be calculated. , square root of voltage This is the phase voltage; this step is to convert the voltage vector form into a scalar form for subsequent comparison and adjustment. By calculating the square root of the voltage, the magnitude of the converter output voltage can be more intuitively reflected.

[0012] In one embodiment of the present invention, the output voltage is obtained according to the phase voltage, which includes: the output voltage can be replaced by the phase voltage.

[0013] Compared with the existing technology, the technical effect achieved by adopting this technical solution is that the square root S can be used to replace the output voltage of the voltage sensor to monitor in real time. ; Optional, because the given q-axis is smaller than the d-axis in actual application, the q-axis voltage value can be omitted in the calculation, and the calculation formula of the square root S can be simplified to .

[0014] In one embodiment of the present invention, whether the suppression program needs to be started is determined based on the output voltage and the voltage preset threshold, including: when the output voltage is greater than the voltage preset threshold, it is determined that the suppression program needs to be started; when the output voltage is less than or equal to the voltage preset threshold, it is determined that the suppression program does not need to be started.

[0015] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: comparing the obtained output voltage with the voltage preset threshold value: If the current voltage is within the allowable range, no adjustment is required. , it is determined that the output voltage is too high and the suppression program needs to be started, then the voltage of the d-axis and q-axis needs to be adjusted.

[0016] In one example of the present invention, when it is determined that the suppression program needs to be started, after adjusting the q-axis current and the d-axis current according to the output voltage and the voltage preset threshold to reduce the output voltage, the suppression control method also includes: repeatedly obtaining the output voltage on the grid side of the converter; and cyclically executing the determination of whether the suppression program needs to be started based on the output voltage and the voltage preset threshold.

[0017] Compared with the existing technology, the technical effect achieved by adopting this technical solution is as follows: when it is determined that the suppression program needs to be initiated, the q-axis current and d-axis current are adjusted according to the output voltage and the preset voltage threshold to reduce the output voltage. The adjusted q-axis current and d-axis current are then fed into the control algorithm of the grid-side converter, generating new PWM control signals, thereby changing the output voltage of the converter. The process then returns to the step of determining whether the suppression program needs to be initiated based on the output voltage and the preset voltage threshold, continuing to monitor the output voltage and making necessary adjustments to ensure the stability of the output voltage of the grid-side converter. Through this iterative process, the output voltage of the grid-side converter can be ensured to always remain within the preset voltage threshold range during the energy feedback process, avoiding damage to the power grid or equipment caused by excessive voltage. At the same time, this method also has the advantages of fast response speed and high control accuracy, and can meet the voltage suppression requirements in different scenarios.

[0018] On the other hand, an embodiment of the present invention also provides a suppression control device for the output voltage of a grid-side converter, including: an acquisition module, the acquisition module is used to obtain the output voltage of the converter grid side; a judgment module, the judgment module is used to judge whether it is necessary to start a suppression program based on the output voltage and a preset voltage threshold; a processing module, the processing module is used to adjust the q-axis current and the d-axis current according to the output voltage and the preset voltage threshold to reduce the output voltage when it is judged that the suppression program needs to be started.

[0019] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the suppression control device for the output voltage of the grid-side converter in this embodiment is used to implement the suppression control method for the output voltage of the grid-side converter as in any embodiment of the present invention, and therefore it has all the beneficial effects of the suppression control method for the output voltage of the grid-side converter as in any embodiment of the present invention, which will not be repeated here.

[0020] On the other hand, an embodiment of the present invention further provides an electronic device, which includes: a processor, a memory, and a program or instruction stored in the memory and executable on the processor. When the program or instruction is executed by the processor, the steps of the method for suppressing the output voltage of the grid-side converter as described in any one of the above embodiments are implemented.

[0021] Compared with the prior art, the technical effect achieved by adopting this technical solution is: the electronic device in this embodiment operates the method for suppressing the output voltage of the grid-side converter as in any embodiment of the present invention, so it has all the beneficial effects of the method for suppressing the output voltage of the grid-side converter as in any embodiment of the present invention, which will not be repeated here.

[0022] On the other hand, an embodiment of the present invention further provides a readable storage medium, which stores a program or instruction. When the program or instruction is executed by a processor, the steps of the method for suppressing the output voltage of the grid-side converter as described in any of the above embodiments are implemented.

[0023] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: the readable storage medium in this embodiment is used to store the suppression control method of the grid-side converter output voltage as in any embodiment of the present invention, so it has all the beneficial effects of the suppression control method of the grid-side converter output voltage as in any embodiment of the present invention, which will not be repeated here.

[0024] After adopting the technical solution of the present invention, the following technical effects can be achieved: (1) In response to the shortcomings of the existing technology, the present invention combines the idea of weak magnetic control of the motor and proposes a method for suppressing excessive output voltage of the grid-side converter based on limiting the sum of the squares of the d-axis current and the q-axis current. By monitoring the voltage of the grid-side port of the converter in real time and dynamically adjusting the currents of the d-axis and q-axis when the voltage is too high, so that the sum of their squares does not exceed a predetermined limit value, the rise of the output voltage is effectively suppressed. This method is not only simple and easy to implement, but also can effectively protect the grid-side converter and power grid equipment from damage caused by excessive voltage without sacrificing the operating efficiency of the grid-side converter. At the same time, since no additional hardware equipment is required, the implementation cost of the present invention is relatively low; (2) When it is determined that the suppression program needs to be started, the q-axis current is adjusted according to the output voltage and the voltage preset threshold, and the q-axis current is reduced according to the difference between the d-axis current command and the d-axis actual current to reduce the output voltage. After that, the adjusted q-axis current and d-axis current are sent to the control algorithm of the grid-side converter to generate a new PWM control signal, thereby changing the output voltage of the converter. Then, the process returns to the step of determining whether the suppression program needs to be started according to the output voltage and the voltage preset threshold, and continues to monitor the output voltage and make necessary adjustments to ensure that the output voltage of the grid-side converter is stable. Through such an iterative process, it can be ensured that during the energy feedback process, the output voltage of the grid-side converter is always maintained within the preset voltage preset threshold range, avoiding damage to the grid or equipment caused by excessive voltage. At the same time, this method also has the advantages of fast response speed and high control accuracy, and can meet the voltage suppression requirements in different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a flow chart of a method for suppressing and controlling the output voltage of a grid-side converter provided in the first embodiment of the present invention; Figure 2 This is an electrical flow chart of the present invention in energy feedback; Figure 3 for Figure 2 The basic control link in the energy feedback process; Figure 4 A schematic block diagram of the structure of a device for suppressing and controlling the output voltage of a grid-side converter provided by a second embodiment of the present invention; Figure 5 A block diagram of an electronic device according to a third embodiment of the present invention; Figure 6 A schematic structural diagram of a readable storage medium provided in a fourth embodiment of the present invention.

[0026] Description of reference numerals: 100 - grid-side converter output voltage suppression control device; 101 - acquisition module; 102 - judgment module; 103 - processing module; 200 - electronic device; 210 - memory; 211 - computer program; 220 - processor; 300 - readable storage medium; 310 - computer executable instructions. DETAILED DESCRIPTION

[0027] To make the above-mentioned objectives, features, and advantages of the present invention more clearly understood, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0028] [Example 1] See also Figure 1 , which is a flow chart of a method for suppressing and controlling the output voltage of a grid-side converter provided by a first embodiment of the present invention. The suppression and control method includes: Step S100: obtaining the output voltage of the grid side of the converter; Step S200: determining whether to start the suppression program based on the output voltage and the preset voltage threshold; Step S300: When it is determined that the suppression program needs to be started, the q-axis current and the d-axis current are adjusted according to the output voltage and the preset voltage threshold to reduce the output voltage.

[0029] Furthermore, step S100 includes: Step S110: acquiring the q-axis voltage and the d-axis voltage; Step S120: Calculate the phase voltage according to the q-axis voltage and the d-axis voltage: ; Step S130: obtaining an output voltage according to the phase voltage; in, is the q-axis voltage, is the d-axis voltage, is the phase voltage.

[0030] Furthermore, step S130 includes: the output voltage may be replaced by the phase voltage.

[0031] In a specific embodiment, the grid-side converter includes a DC side, an AC side, a control system, and a monitoring system. The DC side is connected to an energy storage device or an energy feedback device; the AC side is connected to the power grid; the control system is responsible for controlling the converter's operation and implementing the voltage suppression strategy; the monitoring system includes a voltage sensor and a current sensor for real-time monitoring of the voltage and current at the grid-side port of the grid-side converter. Figure 2 , which is the electrical flow chart of the present invention in energy feedback, wherein are the current vectors on the three-phase grid side, is the DC bus voltage, M is the motor; when the motor is in the power generation state, the DC bus voltage When the voltage rises, the energy feedback device starts to work. At this time, the control program will control the converter and feed back the excess voltage on the DC bus to the grid through the converter device. Figure 3 , showing the basic control links in the energy feedback process, including the outer voltage loop and the inner current loop. When the energy feedback activation threshold is higher than the energy feedback activation threshold, the energy feedback device is in a working state. The present invention will be described in detail below based on this premise.

[0032] Specifically, the suppression control method of this patent monitors the voltage of the grid-side port of the grid-side converter in real time, and uses a voltage sensor on the grid side of the AC reactor to monitor the output voltage of the grid-side converter in real time. Based on the output voltage and the preset voltage threshold, the system determines whether the output voltage is too high, thereby determining whether to initiate the grid-side converter suppression program. If the grid-side converter suppression program is deemed necessary, the system adjusts the q-axis and d-axis currents. Specifically, the q-axis current is adjusted based on the difference between the d-axis current command and the actual d-axis current. The q-axis current is then increased using a PI regulator, reducing the output voltage to below the preset voltage threshold. This effectively reduces the converter's output voltage, preventing damage to the grid or equipment caused by excessive voltage.

[0033] Obtaining the output voltage of the converter grid side may include: obtaining the current q-axis voltage and d-axis voltage , in the control program, and The calculation results of the voltage loop can be obtained directly and their voltage square roots can be calculated. , square root of voltage That is, the phase voltage; this step is to convert the vector form of the voltage into a scalar form for subsequent comparison and adjustment. By calculating the square root of the voltage, the magnitude of the converter output voltage can be more intuitively reflected. Optionally, the square root S can be used instead of the output voltage monitored in real time by the voltage sensor. ; Optional, because the given q-axis voltage is relatively small relative to the d-axis voltage in actual application, the q-axis voltage value can be omitted in the calculation, and the calculation formula of the square root S can be simplified to .

[0034] Preferably, before step S100, the suppression control method may further include: system initialization and parameter setting, setting the voltage preset threshold and the parameters of the PI regulator in the converter control system, specifically: presetting the converter output voltage threshold as the voltage preset threshold in the converter control system The value of this parameter can be adjusted according to the specific grid standards and equipment specifications to adapt to different grid environments and equipment requirements. The following two factors are mainly considered when setting the voltage threshold: (1) Grid standards: Refer to the local grid standards of the equipment and the maximum voltage fluctuation range allowed by the grid to set the voltage threshold. The voltage of the Chinese industrial grid of 380V is used as the reference. (2) Equipment specifications: The rated voltage of the converter device should match the operating voltage of the grid. On this basis, a threshold slightly higher than the rated voltage can be set based on the safety margin of the equipment. At the same time, the parameters of the PI regulator are set to achieve fast and accurate control in the subsequent voltage adjustment process.

[0035] Preferably, the voltage preset threshold Generally equal to the grid voltage.

[0036] Furthermore, step S300 includes: Step S310: When it is determined that the suppression program needs to be started, a voltage difference is obtained based on the output voltage and the voltage preset threshold. ; Step S320: adjusting the q-axis current according to the voltage difference to obtain the actual q-axis voltage that needs to be output; in, is the output voltage, Preset threshold for voltage, is the voltage difference.

[0037] Furthermore, step S320 includes: Step S321: Perform PI calculation on the voltage difference to obtain the d-axis current command; Step S322: Subtract the d-axis current command from the d-axis actual current to generate a d-axis actual current difference; Step S323: further calculating the q-axis current according to the d-axis current command and the d-axis actual current difference to obtain the q-axis actual current difference; Step S324: performing PI regulation on the q-axis actual current difference to obtain the q-axis actual voltage that actually needs to be output.

[0038] Specifically, step S300 includes: calculating the voltage difference ; For voltage difference Perform PI calculation to obtain the d-axis current instruction and set the d-axis current command The actual current of d axis Make a difference and get the actual current difference of d axis ;Will Through a proportional link with a proportional coefficient K, the value obtained by the proportional link is involved in the calculation of the q-axis current. and the actual current on the q axis The difference between the two values is further subtracted from the value obtained by the proportional link to obtain the actual current difference of the q axis. , to adjust the q-axis current.

[0039] According to the actual current difference of the q axis obtained , pass it through the PI regulator to adjust the q-axis current, thereby increasing the q-axis voltage and making the output voltage Less than the preset voltage threshold.

[0040] Among them, regulation It is recommended that the proportional link coefficient and integral link coefficient in the loop be consistent with the proportional coefficient and integral coefficient in the basic voltage loop and current loop.

[0041] Optionally, in step 1 the voltage difference Perform PI calculation to obtain the q-axis current instruction, and then adjust it through PI to obtain the actual q-axis voltage that needs to be output. In order to simplify the calculation, the proportion link can be omitted in step S321.

[0042] Furthermore, step S200 includes: Step S210: When the output voltage is greater than the preset voltage threshold, it is determined that a suppression program needs to be started; Step S220: When the output voltage is less than or equal to the preset voltage threshold, it is determined that the suppression program does not need to be started.

[0043] Specifically, the obtained output voltage is compared with the voltage preset threshold: If the current voltage is within the allowable range, no adjustment is required. , it is determined that the output voltage is too high and the suppression program needs to be started, then the voltage of the d-axis and q-axis needs to be adjusted.

[0044] Preferably, the square root S is used instead of the voltage sensor to monitor the output voltage in real time. In the case of To compare: If , indicating that the current voltage is within the allowable range and does not need to be adjusted; if , you need to adjust the voltage of the d-axis and q-axis.

[0045] Furthermore, after step S300, the suppression control method further includes: Repeatedly obtain the output voltage of the grid side of the converter; The loop is executed to determine whether the suppression program needs to be started based on the output voltage and the voltage preset threshold.

[0046] Specifically, after step S300, the adjusted q-axis current and d-axis current are fed into the grid-side converter's control algorithm, generating new PWM control signals to change the converter's output voltage. The process then returns to step S200 to continue monitoring the output voltage and making necessary adjustments to ensure the grid-side converter's output voltage remains stable. This iterative process ensures that during energy regeneration, the grid-side converter's output voltage remains within a preset voltage threshold, preventing damage to the grid or equipment caused by excessive voltage. This method also offers the advantages of fast response and high control accuracy, meeting voltage suppression requirements in various scenarios.

[0047] To further enhance the practicality and reliability of the present invention, improvements can be incorporated into the grid-side converter method. For example, the parameters of the PI regulator can be adjusted based on actual conditions to optimize voltage regulation performance. Alternatively, when an excessively high output voltage is detected, in addition to adjusting the d-axis and q-axis currents, other measures, such as reducing the converter's operating frequency, can be employed to further reduce the output voltage. These improvements can be flexibly selected and combined based on specific application requirements and actual conditions to achieve optimal results.

[0048] [Example 2] See also Figure 4 This embodiment further provides a device 100 for controlling the output voltage of a grid-side converter, which includes, for example: an acquisition module 101, which is used to acquire the output voltage of the grid side of the converter; a judgment module 102, which is used to judge whether a suppression program needs to be started according to the output voltage and a preset voltage threshold; and a processing module 103, which is used to adjust the q-axis current and the d-axis current according to the output voltage and the preset voltage threshold to reduce the output voltage when it is judged that the suppression program needs to be started.

[0049] In a specific embodiment, the acquisition module 101, the judgment module 102 and the processing module 103 of the grid-side converter output voltage suppression control device 100 cooperate to implement the grid-side converter output voltage suppression control method of the first embodiment above, which will not be repeated here.

[0050] [Example 3] See also Figure 5 This embodiment provides a structural diagram of an electronic device 200. The electronic device 200 includes, for example, a processor 220 and a memory 210 electrically connected to the processor 220. The memory 210 stores a computer program 211. The processor 220 loads the computer program 211 to implement the suppression control method of the grid-side converter output voltage as in the first embodiment.

[0051] [Example 4] See also Figure 6 This embodiment also provides a readable storage medium 300, which stores computer-executable instructions 310. When the computer-executable instructions 310 are read and executed by the processor, the electronic device 200 where the readable storage medium 300 is located is controlled to implement the suppression control method of the grid-side converter output voltage as in the first embodiment.

[0052] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the functional modules in the various embodiments of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0053] If the function is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the present invention. The aforementioned readable storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program code.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for suppressing and controlling the output voltage of a grid-side converter, characterized in that: The inhibition control method comprises: Obtain the output voltage of the grid side of the converter; Determining whether to start a suppression program according to the output voltage and a preset voltage threshold; When it is determined that the suppression program needs to be started, the q-axis current and the d-axis current are adjusted according to the output voltage and a preset voltage threshold to reduce the output voltage.

2. The suppression control method according to claim 1, characterized in that: When it is determined that the suppression program needs to be started, adjusting the q-axis current and the d-axis current according to the output voltage and a preset voltage threshold to reduce the output voltage includes: When it is determined that the suppression program needs to be started, a voltage difference is obtained according to the output voltage and the voltage preset threshold. ; Adjusting the q-axis current according to the voltage difference to obtain the actual q-axis voltage that needs to be output; Adjusting the output voltage according to the actual voltage of the q-axis; in, is the output voltage, A threshold value is preset for the voltage, is the voltage difference.

3. The suppression control method according to claim 2, characterized in that: The step of adjusting the q-axis current according to the voltage difference to obtain the q-axis actual voltage that is actually required to be output includes: Performing PI calculation on the voltage difference to obtain a d-axis current command; The d-axis actual current difference is generated by subtracting the d-axis current command from the d-axis actual current; Further calculating the q-axis current according to the d-axis current command and the d-axis actual current difference to obtain the q-axis actual current difference; The q-axis actual current difference is PI-regulated to obtain the q-axis actual voltage that actually needs to be output.

4. The suppression control method according to claim 1, characterized in that: The obtaining of the output voltage of the grid side of the converter includes: Obtaining the q-axis voltage and the d-axis voltage; The phase voltage is calculated based on the q-axis voltage and the d-axis voltage: ; obtaining the output voltage according to the phase voltage; in, is the q-axis voltage, is the d-axis voltage, is the phase voltage.

5. The suppression control method according to claim 4, characterized in that: The obtaining the output voltage according to the phase voltage comprises: The output voltage may be replaced by the phase voltage.

6. The suppression control method according to claim 1, characterized in that: The determining whether to start the suppression program according to the output voltage and the preset voltage threshold comprises: When the output voltage is greater than the preset voltage threshold, determining that the suppression program needs to be started; When the output voltage is less than or equal to the preset voltage threshold, it is determined that the suppression program does not need to be started.

7. The suppression control method according to claim 1, characterized in that: In the case where it is determined that the suppression program needs to be started, after adjusting the q-axis current and the d-axis current according to the output voltage and the preset voltage threshold to reduce the output voltage, the suppression control method further includes: Repeatedly obtain the output voltage of the grid side of the converter; The cycle is executed to determine whether a suppression program needs to be started according to the output voltage and the preset voltage threshold.

8. A device for controlling the output voltage of a grid-side converter, characterized in that: The inhibition control device comprises: An acquisition module, configured to acquire an output voltage of a grid-side converter; a judgment module, configured to judge whether a suppression program needs to be started based on the output voltage and a preset voltage threshold; A processing module is configured to, when it is determined that the suppression program needs to be started, adjust the q-axis current and the d-axis current according to the output voltage and a preset voltage threshold to reduce the output voltage.

9. An electronic device, characterized in that: The electronic device includes: a processor, a memory, and a program or instruction stored in the memory and executable on the processor. When the program or instruction is executed by the processor, the steps of the method for suppressing and controlling the output voltage of the grid-side converter according to any one of claims 1 to 7 are implemented.

10. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the steps of the method for suppressing and controlling the output voltage of the grid-side converter according to any one of claims 1 to 7 are implemented.

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