Rectifier control method, system and device and storage medium

Abstract

The invention discloses a control method, system and equipment of a rectifier and a storage medium, which are applied to the technical field of industrial conversion, and comprise the following steps: determining a reference value of the switching frequency of the rectifier according to the working condition of the rectifier; judging whether the reference value is greater than or equal to a preset first threshold value; if yes, the change range of the switching frequency is determined based on the reference value, and in the change range of the switching frequency, a modulation mode that the switching frequency switching frequency is the first switching frequency switching frequency in the unit time length is adopted to control the rectifier; otherwise, controlling the rectifier by adopting a modulation mode that the switching frequency of the switching frequency is a second switching frequency in the unit time length; the first switching frequency is greater than the second switching frequency. By applying the scheme of the application, the noise of the traction transformer can be effectively reduced, and the noise can be further reduced by setting the secondary transformer leakage inductance and the intermediate direct current voltage.

Description

Technical Field

[0001] The present invention relates to the field of industrial power conversion technology, and in particular to a control method, system, device and storage medium for a rectifier. Background Art

[0002] With the construction and development of rail transit, high-speed rail and intercity trains have become important modes of transportation. Traction transformers are a crucial component of train traction drive systems, converting high-voltage electrical energy from the traction catenary to the voltage required by the traction converter, while also providing electrical isolation and filtering inductance. However, under the influence of the high-frequency harmonics of the onboard converter and the resulting magnetic field, the traction transformer experiences periodic vibration due to the magnetostrictive effect. This vibration is a significant source of noise interference within the train, reducing passenger comfort.

[0003] There are various existing solutions to suppress noise from onboard traction transformers. Some involve installing dedicated harmonic suppression devices or optimizing the transformer's physical structure, both of which are relatively costly. Other solutions suppress traction transformer noise by increasing the converter switching frequency and appropriately shutting down rectifier control. This approach, by changing the converter's harmonic spectrum characteristics to avoid the overlap of harmonic excitation and vibration modes, has a certain suppressive effect on transformer noise. However, shutting down rectifier control only works under certain operating conditions, such as parking, and is ineffective under most traction and braking conditions. Furthermore, the vibration modes of traction transformers are affected by multiple factors, including the transformer's structure and materials, and can shift over time. Therefore, simply increasing the switching frequency cannot guarantee the avoidance of vibration modes.

[0004] In summary, how to effectively and cost-effectively reduce the noise of the traction transformer is a technical problem that those skilled in the art urgently need to solve. Summary of the Invention

[0005] The object of the present invention is to provide a control method, system, device and storage medium for a rectifier, so as to effectively reduce the noise of a traction transformer.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides a method for controlling a rectifier, comprising:

[0008] Determining a reference value of a switching frequency of the rectifier according to an operating condition of the rectifier;

[0009] Determining whether the reference value is greater than or equal to a preset first threshold;

[0010] If yes, determining a variation range of the switching frequency based on the reference value, and controlling the rectifier within the variation range of the switching frequency by adopting a modulation method in which the number of switching times of the switching frequency within a unit time is a first number of switching times;

[0011] If not, determining a variation range of the switching frequency based on the reference value, and controlling the rectifier by adopting a modulation method in which the number of switching times of the switching frequency per unit time is a second number of switching times within the variation range of the switching frequency;

[0012] The first switching number is greater than the second switching number.

[0013] In one embodiment, determining a reference value of a switching frequency of the rectifier according to an operating condition of the rectifier includes:

[0014] A reference value of the switching frequency of the rectifier is determined according to the temperature of the rectifier, the cooling water temperature of the rectifier, the ambient temperature, and the rectifier input power.

[0015] In one embodiment, determining a reference value of the switching frequency of the rectifier according to the temperature of the rectifier, the cooling water temperature of the rectifier, the ambient temperature, and the rectifier input power includes:

[0016] Determine whether the temperature of the rectifier is lower than a preset rectifier safety temperature threshold;

[0017] If the temperature is not lower than the rectifier safety temperature threshold, determining the reference value of the switching frequency of the rectifier to be a first value;

[0018] If it is lower than the rectifier safety temperature threshold, determining whether the cooling water temperature of the rectifier is lower than the preset cooling water safety temperature threshold;

[0019] If the temperature is not lower than the cooling water safety temperature threshold, determining the reference value of the switching frequency of the rectifier to be a second value;

[0020] If it is lower than the cooling water safety temperature threshold, determine whether the ambient temperature is lower than the preset ambient safety temperature threshold;

[0021] If the temperature is not lower than the environmental safety temperature threshold, determining the reference value of the switching frequency of the rectifier to be a third value;

[0022] If the temperature is lower than the environmental safety temperature threshold, determining whether the rectifier input power is lower than a preset input power threshold;

[0023] If the input power is not lower than the input power threshold, determining the reference value of the switching frequency of the rectifier to be a fourth value;

[0024] If the input power is lower than the input power threshold, determining the reference value of the switching frequency of the rectifier to be a fifth value;

[0025] The first value < the second value < the third value < the fourth value < the fifth value.

[0026] In one embodiment, the first value is equal to the lowest available switching frequency Fs, the second value is Fs+Fp, the third value is Fs+2*Fp; the fourth value is Fs+3*Fp; the fifth value is Fs+4*Fp; and Fp is a preset first step length.

[0027] In one embodiment, it further includes:

[0028] During the control of the rectifier, the intermediate DC voltage is set to the current lower limit value of the intermediate DC voltage.

[0029] In one embodiment, the lower limit of the intermediate DC voltage is The determined lower limit value of the intermediate DC voltage;

[0030] in, is the determined lower limit of the intermediate DC voltage, k is the ratio of the secondary winding to the primary winding of the traction transformer connected to the rectifier, Us is the high-voltage AC power supply voltage of the traction transformer, is the angular frequency, Lg is the secondary leakage inductance of the traction transformer, and P is the rectifier input power.

[0031] In one embodiment, a filter inductor is provided at the secondary winding of the traction transformer connected to the rectifier, and the secondary short-circuit impedance corresponding to the secondary leakage inductance meets a set secondary short-circuit impedance constraint.

[0032] In one embodiment, within a range of switching frequency variation, controlling the rectifier by using a modulation method in which the number of switching times of the switching frequency within a unit time is a first number of switching times includes:

[0033] Within the variation range of the switching frequency, the rectifier is controlled by adopting a modulation mode of switching the switching frequency in each carrier cycle.

[0034] In one embodiment, within a range of switching frequency variation, the rectifier is controlled by adopting a modulation method of switching the switching frequency in each carrier cycle, including:

[0035] Within the variation range of the switching frequency, the rectifier is controlled by adopting a modulation mode in which the switching frequency is switched in each carrier cycle and the switching frequency is cyclically varied according to a second step length within the variation range.

[0036] In one embodiment, within a range of change of the switching frequency, a modulation method is adopted in which the switching frequency switching times per unit time is a second switching times to control the rectifier, including:

[0037] Within the range of the switching frequency, a fixed switching period is adopted, and a modulation mode of switching the switching frequency between A and B is used to control the rectifier;

[0038] Wherein, A is the maximum value of the switching frequency variation range, and B is the minimum value of the switching frequency variation range.

[0039] In one embodiment, A is set to F+a*f1, and B is set to Fa*f1;

[0040] Wherein, F is the reference value of the switching frequency, a is a preset coefficient and is a positive integer, and f1 is the fundamental frequency.

[0041] In a second aspect, the present invention provides a control system for a rectifier, comprising:

[0042] A switching frequency reference value determination module, configured to determine a reference value of the switching frequency of the rectifier according to the operating conditions of the rectifier;

[0043] A judging module, configured to judge whether the reference value is greater than or equal to a preset first threshold;

[0044] If yes, triggering a first modulation module, the first modulation module is configured to determine a variation range of the switching frequency based on the reference value, and, within the variation range of the switching frequency, adopt a modulation method in which the number of switching times of the switching frequency per unit time is a first number of switching times, to control the rectifier;

[0045] If not, triggering a second modulation module, the second modulation module is configured to determine a variation range of the switching frequency based on the reference value, and, within the variation range of the switching frequency, adopt a modulation method in which the number of switching times of the switching frequency within a unit time is a second number of switching times, to control the rectifier;

[0046] The first switching number is greater than the second switching number.

[0047] In one embodiment, the first modulation module is specifically configured to:

[0048] The variation range of the switching frequency is determined based on the reference value, and within the variation range of the switching frequency, a modulation mode of switching the switching frequency in each carrier cycle is adopted to control the rectifier.

[0049] In a third aspect, the present invention provides a control device for a rectifier, comprising:

[0050] memory for storing computer programs;

[0051] A processor is used to execute the computer program to implement the steps of the rectifier control method as described above.

[0052] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the rectifier control method as described above are implemented.

[0053] Applying the technical solutions provided by the embodiments of the present invention, considering that traction transformer noise is caused by harmonic excitation sources (i.e., current harmonics in the traction transformer secondary winding), the present solution optimizes the harmonic excitation sources of traction transformer noise, thereby effectively suppressing traction transformer noise. Given that the current harmonics in the traction transformer secondary winding are negatively correlated with the rectifier switching frequency, the secondary winding current harmonics can be suppressed by increasing the rectifier switching frequency. However, the present solution further considers that the rectifier switching frequency is also subject to rectifier device capabilities. Therefore, in the present solution, a reference value for the rectifier switching frequency is determined based on the rectifier's operating conditions, ensuring that the switching frequency is adaptable to the current operating conditions. Furthermore, in the present solution, the switching frequency is not fixed. Instead, after determining the reference value, a switching frequency variation range is determined, allowing subsequent rectifier control to be performed using a variable switching frequency modulation method within this switching frequency variation range. The use of a variable switching frequency modulation scheme reduces pure-tone noise and improves sound quality. This means that the current harmonic spectrum is dispersed, thereby reducing the harshness of the traction transformer's electromagnetic noise and improving passenger comfort. Furthermore, in the present application, when the reference value is greater than or equal to a first threshold, the number of switching cycles of the rectifier's switching frequency per unit time (a first switching frequency) is greater than the number of switching cycles of the rectifier's switching frequency per unit time (a second switching frequency) when the reference value is less than the first threshold. In other words, when the reference value is larger, the switching frequency can be switched more frequently, while when the reference value is smaller, the switching frequency can be switched less frequently. This is because when the required switching frequency is lower, i.e., when the reference value is smaller, switching the switching frequency too frequently can increase harmonics and reduce the current quality of the secondary winding. When the required switching frequency is higher, i.e., when the reference value is larger, the switching frequency can be switched more frequently, resulting in a more dispersed and smoothed current harmonic spectrum, thereby further improving sound quality. In addition, it can be seen that the present application solution does not require the installation of a dedicated harmonic suppression device or the optimization of the physical structure of the traction transformer for adjusting the switching frequency, so the cost is relatively low.

[0054] In summary, the solution of the present application can effectively reduce the noise of the traction transformer without increasing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0056] Figure 1 A flowchart of a control method for a rectifier provided in a specific embodiment of the present invention;

[0057] Figure 2 A schematic diagram of the topological structure of a four-quadrant rectifier system in a specific embodiment of the present invention;

[0058] Figure 3 This is a typical secondary winding current waveform of a transformer with four-quadrant rectification;

[0059] Figure 4 A schematic diagram of a modulation scheme in which a fixed switching period is adopted and switching of the switching frequency between A and B in a specific embodiment of the present invention;

[0060] Figure 5 The spectrum comparison diagram of fixed switching frequency modulation and variable switching frequency modulation;

[0061] Figure 6 A schematic structural diagram of a control system for a rectifier provided in a specific embodiment of the present invention;

[0062] Figure 7 A schematic structural diagram of a rectifier control device provided in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0063] The core of the present invention is to provide a rectifier control method, system, device and storage medium, which can effectively reduce the noise of the traction transformer without increasing the cost.

[0064] To help those skilled in the art better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It is apparent that the embodiments described are only a portion of the present invention, not all of the embodiments. All other embodiments derived by those skilled in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0065] Please refer to Figure 1 , Figure 1 This is a flow chart of an implementation method of a rectifier control method of the present invention. The rectifier control method may include the following steps:

[0066] Step S101: determining a reference value of the switching frequency of the rectifier according to the working condition of the rectifier.

[0067] The rectifier described in this application can generally be a four-quadrant rectifier, that is, a rectifier that uses fully controlled power semiconductor switching devices, can control its AC side voltage and current vectors, and can operate in all four quadrants of a vector coordinate system.

[0068] See Figure 2 Figure 1 is a schematic diagram of the topology of a four-quadrant rectifier system in one embodiment. The primary winding of the traction transformer is connected to the high-voltage AC input power source, while the secondary winding is connected to the four-quadrant rectifier. While other types of rectifiers may be used in other embodiments, it is understood that these must be capable of controlling the switching frequency.

[0069] For the electromagnetic noise of the traction transformer, its excitation source is the transformer current. Under a good input power supply condition, the transformer current is determined by the load current of its secondary winding (i.e., the secondary winding current). Therefore, the present application scheme optimizes the harmonic excitation source generated by the traction transformer noise, thereby suppressing the traction transformer noise.

[0070] Taking the four-quadrant rectifier as an example, according to the electrical characteristics of the four-quadrant rectifier system, the formula for the current harmonic △I affecting the secondary winding can be obtained, which is expressed as Among them is the peak voltage of the secondary side of the traction transformer, is the rectifier DC voltage, that is, the output voltage of the rectifier, or called the intermediate DC voltage. is the filter inductor, that is, the secondary leakage inductance of the traction transformer, is the switching frequency of the rectifier, specifically the switching frequency of a single tube.

[0071] It can be seen from this formula that when the AC voltage level of the traction system remains unchanged, the current harmonic △I and the secondary leakage inductance , switching frequency Inversely proportional to the rectifier DC voltage within a certain range There is a connection. Figure 3 , which is a typical secondary winding current waveform of a transformer with four-quadrant rectification. It can be seen that there are obvious current harmonics in the secondary winding.

[0072] In the present application, the current harmonic △I of the secondary winding can be reduced by increasing the switching frequency of the rectifier, thereby reducing the sound pressure of the transformer noise and achieving noise suppression of the traction transformer. The present application further takes into account that the switching frequency of the rectifier will also be subject to the device capabilities of the rectifier. Therefore, in the present application, the reference value of the switching frequency of the rectifier will be determined according to the operating conditions of the rectifier, that is, the switching frequency is a value that can adapt to the current operating conditions.

[0073] In a specific embodiment of the present invention, step S101 may specifically include:

[0074] The reference value of the switching frequency of the rectifier is determined according to the temperature of the rectifier, the cooling water temperature of the rectifier, the ambient temperature and the rectifier input power.

[0075] This implementation method takes into account that the switching frequency of the rectifier needs to be increased in the present application solution to achieve noise suppression of the traction transformer, but the operating conditions of the rectifier need to be considered. In other words, the appropriate switching frequency should be selected when the current operating conditions of the rectifier allow it. Therefore, the operating conditions of the rectifier can be measured using the rectifier temperature, the rectifier cooling water temperature, the ambient temperature, and the rectifier input power to ensure stable operation of the rectifier, and then the reference value of the rectifier switching frequency is determined based on the rectifier operating conditions. In general, when the rectifier temperature is low, the rectifier cooling water temperature is low, the ambient temperature is low, and the rectifier input power is low, it is a more ideal operating condition. In this case, it is allowed to set the reference value of the switching frequency higher. Correspondingly, when the relevant temperature is high or the rectifier input power is high, in order to ensure operational safety, it is necessary to appropriately reduce the reference value of the rectifier switching frequency.

[0076] In a specific embodiment of the present invention, determining a reference value of the switching frequency of the rectifier based on the temperature of the rectifier, the cooling water temperature of the rectifier, the ambient temperature, and the rectifier input power may specifically include:

[0077] Determine whether the temperature of the rectifier is lower than a preset rectifier safety temperature threshold;

[0078] If the temperature is not lower than the rectifier safety temperature threshold, determining the reference value of the switching frequency of the rectifier to be a first value;

[0079] If it is lower than the rectifier safety temperature threshold, determine whether the cooling water temperature of the rectifier is lower than the preset cooling water safety temperature threshold;

[0080] If the temperature is not lower than the cooling water safety temperature threshold, determining the reference value of the switching frequency of the rectifier to be a second value;

[0081] If it is lower than the cooling water safety temperature threshold, determine whether the ambient temperature is lower than the preset ambient safety temperature threshold;

[0082] If the temperature is not lower than the ambient safety temperature threshold, determining the reference value of the switching frequency of the rectifier to be a third value;

[0083] If it is lower than the ambient safety temperature threshold, determine whether the rectifier input power is lower than the preset input power threshold;

[0084] If the power is not lower than the input power threshold, determining the reference value of the switching frequency of the rectifier to be a fourth value;

[0085] If the input power is lower than the threshold value, the reference value of the switching frequency of the rectifier is determined to be a fifth value.

[0086] Here, the first value < the second value < the third value < the fourth value < the fifth value.

[0087] In this embodiment, a determination is first made as to whether the rectifier temperature is below a preset rectifier safety temperature threshold. This is because the rectifier temperature is of primary importance. If the rectifier temperature is not below the rectifier safety temperature threshold, the reference value of the rectifier switching frequency should be set lower. In other words, prioritizing safety over suppressing traction transformer noise, the reference value of the rectifier switching frequency is a first value. Of course, the specific value of the first value can be set based on actual needs. For example, the first value is equal to the lowest available switching frequency Fs, which is specifically preset to 450 Hz.

[0088] If the rectifier temperature is lower than the rectifier safety temperature threshold, the switching frequency reference value may be appropriately increased to suppress the noise of the traction transformer. At this point, it can be determined whether the rectifier's cooling water temperature is lower than the preset cooling water safety temperature threshold. If it is not lower than the cooling water safety temperature threshold, this indicates that although the rectifier temperature is lower than the rectifier safety temperature threshold, the cooling water temperature is still at a relatively high level. To ensure safety, the switching frequency reference value can only be appropriately increased to suppress the noise of the traction transformer. In this embodiment, the rectifier switching frequency reference value is determined to be a second value. The specific value of the second value can be set according to actual needs. For example, in one scenario, for ease of setup, the second value can be equal to Fs + Fp, where Fp is the preset first step length. For example, if a fundamental frequency of 50 Hz is selected as the value of Fp, and Fs is specifically 450 Hz, then in this example, the second value can be equal to Fs + Fp = 500 Hz.

[0089] If the cooling water temperature is lower than the cooling water safety temperature threshold, it means that the current rectifier temperature and cooling water temperature are both at a low level, then it can be determined whether the ambient temperature is lower than the preset ambient safety temperature threshold. If the ambient temperature is not lower than the preset ambient safety temperature threshold, it means that the ambient temperature is high. In order to ensure safety, the reference value of the rectifier switching frequency is determined to be a third value at this time. The specific value of the third value can be set according to actual needs, but it needs to be higher than the second value to effectively suppress the noise of the traction transformer. For example, in one scenario, for the convenience of setting, the third value can be equal to Fs+2*Fp. In the example where the fundamental frequency of 50Hz is selected as the value of Fp and Fs is specifically 450H, the third value can be equal to Fs+2*Fp=550Hz.

[0090] If the ambient temperature is lower than the preset ambient safety temperature threshold, it means that the current rectifier temperature, cooling water temperature, and ambient temperature are all at a low level, then it can be determined whether the rectifier input power is lower than the preset input power threshold. If the rectifier input power is not lower than the preset input power threshold, it means that the rectifier input power is high. In order to ensure safety, the reference value of the rectifier switching frequency is determined to be a fourth value at this time. The specific value of the fourth value can be set according to actual needs, but it needs to be higher than the third value to effectively suppress the noise of the traction transformer. For example, in one scenario, for the convenience of setting, the fourth value can be equal to Fs+3*Fp. In the example where the fundamental frequency of 50Hz is selected as the value of Fp and Fs is specifically 450H, the fourth value can be equal to Fs+3*Fp=600Hz.

[0091] If the rectifier input power is lower than the preset input power threshold, indicating that the current rectifier temperature, cooling water temperature, and ambient temperature are all at low levels, and the rectifier input power is also low, then the switching frequency can be set higher. In this embodiment, the reference value of the rectifier switching frequency is determined to be a fifth value. The specific value of the fifth value can be set according to actual needs, but it needs to be higher than the fourth value to effectively suppress the noise of the traction transformer. For example, in one scenario, for convenience, the fifth value can be equal to Fs + 4 * Fp. In the example where the fundamental frequency of 50 Hz is selected as the value of Fp, and Fs is specifically 450H, the fifth value can be equal to Fs + 4 * Fp = 650Hz.

[0092] It can be seen that in this embodiment, the rectifier temperature, the rectifier cooling water temperature, the ambient temperature and the rectifier input power are considered in order of importance, so that when the working conditions permit, the reference value of the switching frequency can be adjusted accordingly to reduce noise.

[0093] Step S102: Determine whether the reference value is greater than or equal to a preset first threshold value. If yes, proceed to step S103; if not, proceed to step S104.

[0094] In the solution of the present application, the rectifier is controlled by a modulation method of a variable switching frequency instead of a fixed switching frequency modulation method. Therefore, after obtaining the reference value of the switching frequency of the rectifier, it is necessary to determine the range of change of the switching frequency based on the reference value.

[0095] Furthermore, the solution of this application takes into account that when the required switching frequency is low, that is, when the reference value is low, if the switching frequency is switched too frequently, harmonics will increase and the current quality of the secondary winding will be reduced. However, when the required switching frequency is high, that is, when the reference value is high, the switching frequency can be switched more frequently, which can make the current harmonic spectrum more dispersed and smooth, thereby further improving the sound quality. Therefore, the solution of this application determines whether the reference value is greater than or equal to a preset first threshold value to determine whether the required switching frequency is low or high.

[0096] The specific value of the first threshold can be set according to actual needs. For example, in one scenario, it is specifically set to 20 times the fundamental frequency, that is, 1000 Hz.

[0097] Step S103: determining a variation range of the switching frequency based on the reference value, and controlling the rectifier within the variation range of the switching frequency by adopting a modulation method in which the number of switching times of the switching frequency within a unit time is a first number of switching times.

[0098] Step S104: determining a variation range of the switching frequency based on the reference value, and controlling the rectifier within the variation range of the switching frequency by adopting a modulation method in which the number of switching times of the switching frequency within a unit time is a second number of switching times.

[0099] The first switching frequency is greater than the second switching frequency. That is, when the reference value is greater than or equal to the first threshold, the number of switching times of the rectifier's switching frequency per unit time is greater than the number of switching times of the rectifier's switching frequency per unit time when the reference value is less than the first threshold.

[0100] Regardless of whether the reference value is greater than or equal to a preset first threshold or less than the first threshold, the present application scheme requires determining the switching frequency variation range based on the reference value, and then, within the switching frequency variation range, adopting a modulation method of varying the switching frequency to control the rectifier. The difference is that when the reference value is greater than or equal to the preset first threshold, it indicates that the required switching frequency is higher. In this case, the present application scheme allows switching the switching frequency at a higher frequency, and therefore adopts a modulation method in which the number of switching frequency changes per unit time is a first switching number. When the reference value is less than the first threshold, the switching frequency needs to be appropriately reduced, and therefore adopts a modulation method in which the number of switching frequency changes per unit time is a second switching number to avoid generating larger harmonics. The first switching number is greater than the second switching number. That is, when the reference value is greater than or equal to the first threshold, the number of switching frequency changes per unit time of the rectifier (i.e., the first switching number) is greater than the number of switching frequency changes per unit time of the rectifier (i.e., the second switching number) when the reference value is less than the first threshold.

[0101] The specific numerical value of the unit time described in the scheme of the present application can be set as needed, and is only used to measure the number of times the switching frequency of the rectifier is switched within the unit time, so as to indicate that when the reference value is greater than or equal to the first threshold, the switching frequency of the rectifier can be switched more frequently, and when the reference value is less than the first threshold, the switching frequency of the rectifier does not need to be switched too frequently.

[0102] When determining the variation range of the switching frequency based on the reference value, the specific implementation method can be set according to actual needs, but it can be understood that the reference value should be used as the standard, and the variation range of the switching frequency should be delineated near the reference value. For example, the reference value of the switching frequency is recorded as F, and the variation range of the switching frequency can be set to (Fc, F+b). Here, c and b are both preset parameters greater than or equal to 0, and the values can be set according to actual needs. For example, when c is 0, the reference value F of the switching frequency is used as the lower limit of the variation range, and when b is 0, the reference value F of the switching frequency is used as the upper limit of the variation range. Of course, c and b will not be set to 0 at the same time.

[0103] In addition, it should be noted that regardless of whether the reference value is greater than or equal to the preset first threshold value or less than the first threshold value, in the present application scheme, it is necessary to determine the range of change of the switching frequency based on the reference value. However, for these two different situations, different rules can be used to determine the range of change of the switching frequency, which does not affect the implementation of the present invention, as long as the range of change of the switching frequency is defined near the reference value.

[0104] Regardless of whether the reference value is greater than or equal to the preset first threshold or less than the first threshold, after determining the range of change of the switching frequency, it is necessary to adopt a modulation method of a variable switching frequency to control the rectifier. This is because the present application scheme takes into account that in addition to reducing the amplitude of the secondary winding current harmonics, thereby reducing the sound pressure of the transformer noise, sound quality is also another important evaluation dimension of the transformer noise. In order to improve the sound quality, the present application scheme does not use a fixed switching frequency modulation method as used in the traditional scheme during the control of the rectifier, but adopts a modulation method of a variable switching frequency. This can disperse the harmonic spectrum, thereby reducing the pure tone and improving the sound quality.

[0105] In a specific embodiment of the present invention, within the range of the switching frequency variation, controlling the rectifier by using a modulation method in which the number of switching times of the switching frequency within a unit time is a first number of switching times may specifically include:

[0106] Within the range of switching frequency variation, the rectifier is controlled by adopting a modulation method of switching the switching frequency in each carrier cycle.

[0107] This embodiment takes into account that, in step S103, since the reference value is greater than or equal to the preset first threshold, more frequent switching of the switching frequency is permitted. Therefore, to effectively reduce the noise of the traction transformer, the rectifier is controlled by adopting a modulation method that switches the switching frequency within each carrier cycle within the switching frequency variation range. In other words, in this embodiment, the switching frequency is continuously switched to achieve optimal noise suppression.

[0108] Furthermore, in a specific embodiment of the present invention, within the range of the switching frequency, the rectifier is controlled by adopting a modulation method of switching the switching frequency in each carrier cycle, which may specifically include:

[0109] Within the variation range of the switching frequency, the rectifier is controlled by adopting a modulation mode in which the switching frequency is switched in each carrier cycle and the switching frequency is cyclically varied according to a second step length within the variation range.

[0110] This implementation further takes into account that when the switching frequency needs to be continuously switched, there may be multiple specific implementation methods. However, if the switching frequency is cyclically changed according to the second step size within the variation range, it will be simpler and more convenient to implement.

[0111] For example, in one scenario, the switching frequency base value is 1500 Hz, and the switching frequency variation range is set to (1000 Hz to 2000 Hz). In this example, the switching frequency base value is the middle value of the switching frequency variation range. During the first carrier cycle, when controlling the rectifier, for example, the switching frequency used is 1000 Hz. During the second carrier cycle, when controlling the rectifier, the switching frequency used is 1000 Hz + 50 Hz = 1050 Hz. In this example, the second step size is set to 50 Hz. During the third carrier cycle, when controlling the rectifier, the switching frequency used is 1050 Hz + 50 Hz = 1100 Hz. Similarly, after reaching 2000 Hz, the switching frequency can be cyclically varied. It is understood that there are two possible cyclical modes. For example, in this example, after reaching 2000 Hz, the switching frequency can be gradually decreased to 1000 Hz according to the second step size, and the cycle can be repeated in this manner. For example, after the switching frequency reaches 2000Hz, it can be directly reduced to 1000Hz, and then increased again from 1000Hz according to the second step, and so on. In actual applications, the former cyclic change method is usually selected to avoid sudden changes in the switching frequency.

[0112] It can be seen that in this example, the rectifier is controlled by a modulation method that cyclically changes according to the second step size within the range of the switching frequency. This is relatively simple and convenient to implement, and because the switching frequency is switched in each cycle of the carrier, a good harmonic spectrum dispersion effect can be achieved, which can effectively reduce the pure tone of the traction transformer noise and improve the sound quality.

[0113] In a specific embodiment of the present invention, within a range of change of the switching frequency, a modulation method is adopted in which the switching frequency switching times per unit time is a second switching times to control the rectifier, including:

[0114] Within the range of switching frequency variation, a fixed switching period is adopted and a modulation method of switching the switching frequency between A and B is used to control the rectifier;

[0115] Wherein, A is the maximum value of the switching frequency variation range, and B is the minimum value of the switching frequency variation range.

[0116] This embodiment takes into account that, in step S104, since the reference value is less than the first threshold, there is no need to switch the switching frequency too frequently. Therefore, a modulation method is used to control the rectifier by switching the switching frequency between values A and B within the switching frequency variation range, using a fixed switching cycle. In other words, in this embodiment, the switching frequency can be continuously switched between values A and B according to a fixed switching cycle to achieve noise suppression.

[0117] The specific values of A and B can be set according to actual needs. For example, in one embodiment of the present invention, considering the human hearing effect, A can be set to F + a * f1, and B can be set to Fa * f1 to improve the sound quality of noise. Here, F is the reference value of the switching frequency, a is a preset coefficient and a positive integer, which can generally be 1, 2, or 3, and f1 is the fundamental frequency.

[0118] The switching period described in this embodiment can usually be set to a value such as 1 times, 5 times, 10 times, or 50 times the fundamental wave period according to actual needs.

[0119] See Figure 4 , is a modulation diagram of a specific implementation method, using a fixed switching period and switching the switching frequency between A and B. It can be seen that Figure 4 In the embodiment, the fixed switching period is specifically set to 1 times the fundamental wave period, that is, the switching frequency is switched after each fundamental wave period. For example, if the reference value of the switching frequency is 450Hz, the fundamental wave frequency f1 is 50Hz, and a is set to 2, then A is equal to 550Hz and B is equal to 350Hz in the above example. In other words, in this case, the switching frequency is switched after each fundamental wave period. For example, if the switching frequency used in the current fundamental wave period is specifically 550Hz, then the switching frequency used in the next fundamental wave period is specifically 350Hz. In the next fundamental wave period, the switching frequency is switched back to 550Hz, and so on.

[0120] See Figure 5 , is a spectrum comparison diagram of fixed switching frequency modulation and variable switching frequency modulation. It can be seen that for Figure 5 In the case of fixed switching frequency modulation on the left, the current harmonics have a harmonic amplitude of about 80A and a concentrated spectrum, which will make the electromagnetic noise of the traction transformer more harsh and sharp. Figure 5 The changing switching frequency modulation on the right is Figure 4 By switching the switching frequency at multiples of the fundamental wave, the current harmonic amplitude is about 45A, and the harmonic spectrum is dispersed, which can reduce the purity of the noise and improve the sound quality.

[0121] In a specific embodiment of the present invention, it may further include:

[0122] During the control of the rectifier, the intermediate DC voltage is set to the current lower limit value of the intermediate DC voltage.

[0123] As described above, the formula for the current harmonic △I affecting the secondary winding is expressed as Current harmonics △I and secondary leakage inductance , switching frequency Inversely proportional to the rectifier DC voltage within a certain range There is a connection.

[0124] Since the electrical characteristics of the four-quadrant rectifier are boost type and there is a voltage drop on the transformer leakage inductance, the intermediate DC voltage is reduced. The current harmonics ΔI can be reduced, and the sound pressure of the traction transformer noise can be reduced. In this embodiment, the intermediate DC voltage is reduced during the control of the rectifier. Specifically, directly Set to the current lower limit of the intermediate DC voltage.

[0125] In a specific embodiment, the lower limit of the intermediate DC voltage is Determine the lower limit of the intermediate DC voltage.

[0126] in, is the determined lower limit of the intermediate DC voltage, k is the ratio of the secondary winding to the primary winding of the traction transformer connected to the rectifier, Us is the high-voltage AC power supply voltage of the traction transformer, is the angular frequency, Lg is the secondary leakage inductance of the traction transformer, and P is the rectifier input power.

[0127] In this implementation, the lower limit of the intermediate DC voltage can be determined in real time based on the high-voltage AC power supply voltage and the rectifier input power. , and then setting the intermediate DC voltage to the lower limit of the intermediate DC voltage can effectively reduce the current harmonic △I, thereby reducing the sound pressure of the traction transformer noise.

[0128] In a specific embodiment of the present invention, a filter inductor is provided at the secondary winding of the traction transformer connected to the rectifier, and the secondary short-circuit impedance corresponding to the secondary leakage inductance meets the set secondary short-circuit impedance constraint.

[0129] As described above, the current harmonics △I and the secondary leakage inductance Inversely proportional to the secondary leakage inductance It is also possible to reduce the current harmonics △I, thereby reducing the sound pressure of the traction transformer noise. For example, the air gap between the primary winding and the secondary winding can be enlarged to increase the secondary leakage inductance. In this embodiment, a filter inductor is provided at the secondary winding of the traction transformer to improve the secondary leakage inductance. In addition, the secondary leakage inductance The increase in the secondary leakage inductance must be within a reasonable range. Excessive secondary leakage inductance can inhibit current rise, limiting the system's power output. Therefore, in this implementation, the secondary short-circuit impedance corresponding to the secondary leakage inductance satisfies the specified secondary short-circuit impedance constraint. For example, in a rail transit onboard transformer, the secondary short-circuit impedance corresponding to the secondary leakage inductance should not exceed 50%.

[0130] Applying the technical solutions provided by the embodiments of the present invention, considering that traction transformer noise is caused by harmonic excitation sources (i.e., current harmonics in the traction transformer secondary winding), the present solution optimizes the harmonic excitation sources of traction transformer noise, thereby effectively suppressing traction transformer noise. Given that the current harmonics in the traction transformer secondary winding are negatively correlated with the rectifier switching frequency, the secondary winding current harmonics can be suppressed by increasing the rectifier switching frequency. However, the present solution further considers that the rectifier switching frequency is also subject to rectifier device capabilities. Therefore, in the present solution, a reference value for the rectifier switching frequency is determined based on the rectifier's operating conditions, ensuring that the switching frequency is adaptable to the current operating conditions. Furthermore, in the present solution, the switching frequency is not fixed. Instead, after determining the reference value, a switching frequency variation range is determined, allowing subsequent rectifier control to be performed using a variable switching frequency modulation method within this switching frequency variation range. The use of a variable switching frequency modulation scheme reduces pure-tone noise and improves sound quality. This means that the current harmonic spectrum is dispersed, thereby reducing the harshness of the traction transformer's electromagnetic noise and improving passenger comfort. Furthermore, in the present application, when the reference value is greater than or equal to a first threshold, the number of switching cycles of the rectifier's switching frequency per unit time (a first switching frequency) is greater than the number of switching cycles of the rectifier's switching frequency per unit time (a second switching frequency) when the reference value is less than the first threshold. In other words, when the reference value is larger, the switching frequency can be switched more frequently, while when the reference value is smaller, the switching frequency can be switched less frequently. This is because when the required switching frequency is lower, i.e., when the reference value is smaller, switching the switching frequency too frequently can increase harmonics and reduce the current quality of the secondary winding. When the required switching frequency is higher, i.e., when the reference value is larger, the switching frequency can be switched more frequently, resulting in a more dispersed and smoothed current harmonic spectrum, thereby further improving sound quality. In addition, it can be seen that the present application solution does not require the installation of a dedicated harmonic suppression device or the optimization of the physical structure of the traction transformer for adjusting the switching frequency, so the cost is relatively low.

[0131] In summary, the solution of the present application can effectively reduce the noise of the traction transformer without increasing the cost.

[0132] Corresponding to the above method embodiment, an embodiment of the present invention further provides a control system for a rectifier, which can be referred to in correspondence with the above.

[0133] See also Figure 6 FIG. 1 is a schematic diagram of a control system for a rectifier according to the present invention, comprising:

[0134] A switching frequency reference value determination module 601 is configured to determine a reference value of the switching frequency of the rectifier according to the operating conditions of the rectifier;

[0135] A judgment module 602 is used to judge whether the reference value is greater than or equal to a preset first threshold;

[0136] If yes, the first modulation module 603 is triggered, and the first modulation module 603 is used to determine a variation range of the switching frequency based on the reference value, and control the rectifier by adopting a modulation method in which the number of switching frequency switching times per unit time is a first number of switching times within the variation range of the switching frequency;

[0137] If not, triggering the second modulation module 604, the second modulation module 604 is configured to determine a variation range of the switching frequency based on the reference value, and control the rectifier by adopting a modulation method in which the number of switching frequency switching times per unit time is a second number of switching times within the variation range of the switching frequency;

[0138] The first switching number is greater than the second switching number.

[0139] In a specific embodiment of the present invention, the switching frequency reference value determination module 601 is specifically configured to:

[0140] The reference value of the switching frequency of the rectifier is determined according to the temperature of the rectifier, the cooling water temperature of the rectifier, the ambient temperature and the rectifier input power.

[0141] In a specific embodiment of the present invention, the switching frequency reference value determination module 601 is specifically configured to:

[0142] Determine whether the temperature of the rectifier is lower than a preset rectifier safety temperature threshold;

[0143] If the temperature is not lower than the rectifier safety temperature threshold, determining the reference value of the switching frequency of the rectifier to be a first value;

[0144] If it is lower than the rectifier safety temperature threshold, determine whether the cooling water temperature of the rectifier is lower than the preset cooling water safety temperature threshold;

[0145] If the temperature is not lower than the cooling water safety temperature threshold, determining the reference value of the switching frequency of the rectifier to be a second value;

[0146] If it is lower than the cooling water safety temperature threshold, determine whether the ambient temperature is lower than the preset ambient safety temperature threshold;

[0147] If the temperature is not lower than the ambient safety temperature threshold, determining the reference value of the switching frequency of the rectifier to be a third value;

[0148] If it is lower than the ambient safety temperature threshold, determine whether the rectifier input power is lower than the preset input power threshold;

[0149] If the power is not lower than the input power threshold, determining the reference value of the switching frequency of the rectifier to be a fourth value;

[0150] If the input power is lower than the threshold, determining the reference value of the switching frequency of the rectifier to be a fifth value;

[0151] Here, the first value < the second value < the third value < the fourth value < the fifth value.

[0152] In a specific embodiment of the present invention, the first value is equal to the lowest available switching frequency Fs, the second value is Fs+Fp, the third value is Fs+2*Fp; the fourth value is Fs+3*Fp; the fifth value is Fs+4*Fp; and Fp is a preset first step length.

[0153] In a specific embodiment of the present invention, an intermediate DC voltage adjustment module is further included, which is used to:

[0154] During the control of the rectifier, the intermediate DC voltage is set to the current lower limit value of the intermediate DC voltage.

[0155] In a specific embodiment of the present invention, the lower limit of the intermediate DC voltage is The determined lower limit value of the intermediate DC voltage;

[0156] in, is the determined lower limit of the intermediate DC voltage, k is the ratio of the secondary winding to the primary winding of the traction transformer connected to the rectifier, Us is the high-voltage AC power supply voltage of the traction transformer, is the angular frequency, Lg is the secondary leakage inductance of the traction transformer, and P is the rectifier input power.

[0157] In a specific embodiment of the present invention, a filter inductor is provided at the secondary winding of the traction transformer connected to the rectifier, and the secondary short-circuit impedance corresponding to the secondary leakage inductance meets the set secondary short-circuit impedance constraint.

[0158] In a specific embodiment of the present invention, the first modulation module 603 is specifically configured to:

[0159] The variation range of the switching frequency is determined based on the reference value, and within the variation range of the switching frequency, a modulation mode of switching the switching frequency in each carrier cycle is adopted to control the rectifier.

[0160] In a specific embodiment of the present invention, the first modulation module 603 is specifically configured to:

[0161] The switching frequency variation range is determined based on the reference value, and within the switching frequency variation range, the switching frequency is switched in each carrier cycle, and the switching frequency is cyclically varied according to a second step size within the variation range to control the rectifier.

[0162] In a specific embodiment of the present invention, the second modulation module 604 is specifically configured to:

[0163] Determine a range of switching frequency based on a reference value, and control the rectifier by adopting a modulation method of switching the switching frequency between A and B with a fixed switching period within the range of switching frequency;

[0164] Wherein, A is the maximum value of the switching frequency variation range, and B is the minimum value of the switching frequency variation range.

[0165] In a specific embodiment of the present invention, A is set to F+a*f1, and B is set to Fa*f1;

[0166] Wherein, F is the reference value of the switching frequency, a is a preset coefficient and is a positive integer, and f1 is the fundamental frequency.

[0167] Corresponding to the above method and system embodiments, embodiments of the present invention further provide a rectifier control device and a computer-readable storage medium, which can be referenced in correspondence with the above.

[0168] See also Figure 7 As shown, the device may include:

[0169] Memory 701, used for storing computer programs;

[0170] The processor 702 is configured to execute a computer program to implement the steps of the rectifier control method in any of the above embodiments.

[0171] The computer-readable storage medium stores a computer program. When executed by a processor, the computer program implements the steps of the rectifier control method described in any of the above embodiments. The computer-readable storage medium herein includes random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium known in the art.

[0172] It should also be noted that, in this application, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0173] Those skilled in the art may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in this application can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention. Specific examples are used in this application to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical solution and core ideas of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A rectifier control method, characterized in that: include: Determining a reference value of a switching frequency of the rectifier according to an operating condition of the rectifier; Determining whether the reference value is greater than or equal to a preset first threshold; If yes, determining a variation range of the switching frequency based on the reference value, and controlling the rectifier within the variation range of the switching frequency by adopting a modulation method in which the number of switching times of the switching frequency within a unit time is a first number of switching times; If not, determining a variation range of the switching frequency based on the reference value, and controlling the rectifier by adopting a modulation method in which the number of switching times of the switching frequency per unit time is a second number of switching times within the variation range of the switching frequency; The first switching number is greater than the second switching number.

2. The rectifier control method according to claim 1, characterized in that: Determining a reference value of a switching frequency of the rectifier according to an operating condition of the rectifier includes: A reference value of the switching frequency of the rectifier is determined according to the temperature of the rectifier, the cooling water temperature of the rectifier, the ambient temperature, and the rectifier input power.

3. The rectifier control method according to claim 2, characterized in that: Determining a reference value of the switching frequency of the rectifier according to the temperature of the rectifier, the cooling water temperature of the rectifier, the ambient temperature, and the rectifier input power includes: Determine whether the temperature of the rectifier is lower than a preset rectifier safety temperature threshold; If the temperature is not lower than the rectifier safety temperature threshold, determining the reference value of the switching frequency of the rectifier to be a first value; If it is lower than the rectifier safety temperature threshold, determining whether the cooling water temperature of the rectifier is lower than the preset cooling water safety temperature threshold; If the temperature is not lower than the cooling water safety temperature threshold, determining the reference value of the switching frequency of the rectifier to be a second value; If it is lower than the cooling water safety temperature threshold, determine whether the ambient temperature is lower than the preset ambient safety temperature threshold; If the temperature is not lower than the environmental safety temperature threshold, determining the reference value of the switching frequency of the rectifier to be a third value; If the temperature is lower than the environmental safety temperature threshold, determining whether the rectifier input power is lower than a preset input power threshold; If the input power is not lower than the input power threshold, determining the reference value of the switching frequency of the rectifier to be a fourth value; If the input power is lower than the input power threshold, determining the reference value of the switching frequency of the rectifier to be a fifth value; The first value < the second value < the third value < the fourth value < the fifth value.

4. The rectifier control method according to claim 3, characterized in that: The first value is equal to the lowest available switching frequency Fs, the second value is Fs+Fp, the third value is Fs+2*Fp; the fourth value is Fs+3*Fp; the fifth value is Fs+4*Fp; and Fp is a preset first step length.

5. The rectifier control method according to claim 1, characterized in that: Also includes: During the control of the rectifier, the intermediate DC voltage is set to the current lower limit value of the intermediate DC voltage.

6. The rectifier control method according to claim 5, characterized in that: The lower limit of the intermediate DC voltage is The determined lower limit value of the intermediate DC voltage; in, is the determined lower limit of the intermediate DC voltage, k is the ratio of the secondary winding to the primary winding of the traction transformer connected to the rectifier, Us is the high-voltage AC power supply voltage of the traction transformer, is the angular frequency, Lg is the secondary leakage inductance of the traction transformer, and P is the rectifier input power.

7. The rectifier control method according to claim 1, characterized in that: A filter inductor is provided at the secondary winding of the traction transformer connected to the rectifier, and the secondary short-circuit impedance corresponding to the secondary leakage inductance meets the set secondary short-circuit impedance constraint.

8. The rectifier control method according to any one of claims 1 to 7, characterized in that: Within a range of change of the switching frequency, a modulation method is adopted in which the switching frequency switching times per unit time is a first switching times, to control the rectifier, including: Within the variation range of the switching frequency, the rectifier is controlled by adopting a modulation mode of switching the switching frequency in each carrier cycle.

9. The rectifier control method according to claim 8, characterized in that: Within the range of the switching frequency, the rectifier is controlled by adopting a modulation method of switching the switching frequency in each carrier cycle, including: Within the variation range of the switching frequency, the rectifier is controlled by adopting a modulation mode in which the switching frequency is switched in each carrier cycle and the switching frequency is cyclically varied according to a second step length within the variation range.

10. The rectifier control method according to any one of claims 1 to 7, characterized in that: Within the variation range of the switching frequency, a modulation method is adopted in which the switching frequency switching times per unit time is a second switching times, to control the rectifier, including: Within the range of the switching frequency, a fixed switching period is adopted, and a modulation mode of switching the switching frequency between A and B is used to control the rectifier; Wherein, A is the maximum value of the switching frequency variation range, and B is the minimum value of the switching frequency variation range.

11. The rectifier control method according to claim 10, characterized in that: A is set to F+a*f1, and B is set to Fa*f1; Wherein, F is the reference value of the switching frequency, a is a preset coefficient and is a positive integer, and f1 is the fundamental frequency.

12. A rectifier control system, characterized in that: include: A switching frequency reference value determination module, configured to determine a reference value of the switching frequency of the rectifier according to the operating conditions of the rectifier; A judging module, configured to judge whether the reference value is greater than or equal to a preset first threshold; If yes, triggering a first modulation module, the first modulation module is configured to determine a variation range of the switching frequency based on the reference value, and, within the variation range of the switching frequency, adopt a modulation method in which the number of switching times of the switching frequency within a unit time is a first switching number, to control the rectifier; If not, triggering a second modulation module, the second modulation module being configured to determine a variation range of the switching frequency based on the reference value, and controlling the rectifier by adopting a modulation method in which the number of switching times of the switching frequency within a unit time is a second number of switching times within the variation range of the switching frequency; The first switching number is greater than the second switching number.

13. The rectifier control system according to claim 12, characterized in that: The first modulation module is specifically configured to: The variation range of the switching frequency is determined based on the reference value, and within the variation range of the switching frequency, a modulation mode of switching the switching frequency in each carrier cycle is adopted to control the rectifier.

14. A rectifier control device, characterized in that: include: memory for storing computer programs; A processor, configured to execute the computer program to implement the steps of the rectifier control method according to any one of claims 1 to 11.

15. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the rectifier control method according to any one of claims 1 to 11 are implemented.

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