Rectifier control method, apparatus, system and device

Abstract

A rectifier control method, apparatus, system and device, capable of determining the number of normally operating rectifiers on the basis of state information of each rectifier among multiple rectifiers, and then dynamically adjusting the frequency and phase shift angle of a carrier of each rectifier on the basis of the number of normally operating rectifiers and the magnitude of operating power of each rectifier, thereby changing the distribution of harmonics in a grid-side current. Thus, the harmonics in the grid-side current can be effectively suppressed, effectively reducing the risks of transformer overheating, abnormal vibration of components, and capacitor breakdown and damage in the multiple rectifiers.

Description

A control method, device, system and apparatus of a rectifier TECHNICAL FIELD

[0001] The present application belongs to the technical field of power control, and particularly relates to a control method, device, system and apparatus of a rectifier. BACKGROUND

[0002] With the development of power electronics technology, multi-rectifiers have been widely applied in rail transit vehicles, new energy power generation, industrial transmission and other industries.

[0003] The multi-rectifier is an intermediate bridge connecting the power supply network and the subsequent devices and loads. During the operation of each rectifier in the multi-rectifier, due to the action of the electronic switch in the rectifier, not only low-frequency harmonics but also high-frequency harmonics exist in the network-side current. When the high-frequency harmonics contained in the network-side current exceed a certain limit, it may cause the transformer in the multi-rectifier to overheat, may cause abnormal vibration of the device, and may cause breakdown and damage of the capacitor in the rectifier.

[0004] Therefore, how to suppress the harmonics in the network-side current is a problem to be solved by those skilled in the art.

[0005] SUMMARY

[0006] The purpose of the present application is to provide a control method, device, system and apparatus of a rectifier. The control method, device, system and apparatus of a rectifier provided by the present application can effectively suppress the harmonics in the network-side current and can effectively reduce the risk of overheat of the transformer in the multi-rectifier, abnormal vibration of the device, and breakdown and damage of the capacitor.

[0007] The technical scheme provided by the present application is as follows:

[0008] A control method of a rectifier applied to a multi-rectifier, the multi-rectifier comprising a transformer and a plurality of rectifiers, the method comprising:

[0009] obtaining a network-side voltage signal and extracting phase information of the network-side voltage signal;

[0010] obtaining a rectification current signal of each rectifier;

[0011] obtaining operating power and state information of each rectifier in the multi-rectifier according to the network-side voltage signal, the rectification current signal of each rectifier and a transformation ratio of the transformer;

[0012] setting a frequency and a phase-shifting angle of a carrier of each rectifier according to the phase information of the network-side voltage signal and the operating power and state information of each rectifier in the multi-rectifier.

[0013] According to the frequency and phase shift angle of the carrier of each rectifier, a corresponding carrier and modulation wave pair drive control each rectifier.

[0014] Optionally, the setting of the frequency and phase shift angle of the carrier of each rectifier according to the phase information of the grid-side voltage signal, the operating power and state information of each rectifier in the multi-rectifier includes:

[0015] If there are N+M rectifiers normally operating in the multi-rectifier, and the operating power of the N+M rectifiers is equal to the first preset power, then based on the phase information of the grid-side voltage signal, the phase shift angle of the carrier of each rectifier is set to be separated by an angle of π / (N+M) between adjacent two rectifiers, and the rated carrier frequency is taken as the frequency of the carrier of each rectifier, wherein N and M are positive integers greater than or equal to 1.

[0016] If there are N rectifiers normally operating and M rectifiers stopped in the multi-rectifier, and the operating power of the N rectifiers is equal to the first preset power, then based on the phase information of the grid-side voltage signal, the phase shift angle of the carrier of each rectifier is set to be separated by an angle of π / N between adjacent two rectifiers in the N rectifiers, the phase shift angle of the carrier of each rectifier is set to be separated by an angle of π / M between adjacent two rectifiers in the M rectifiers, and the rated carrier frequency of the rectifier is taken as the frequency of the carrier of the M+N rectifiers.

[0017] Optionally, the setting of the frequency and phase shift angle of the carrier of each rectifier according to the phase information of the grid-side voltage signal, the operating power and state information of each rectifier in the multi-rectifier further includes:

[0018] If there are N1+N2 rectifiers normally operating and M rectifiers stopped in the multi-rectifier, and the operating power of the N1 rectifiers is equal to the first preset power, and the deviation rate of the operating power of the N2 rectifiers from the first preset power is less than a first preset deviation rate, then the following steps are performed:

[0019] Based on the phase information of the grid-side voltage signal, the phase shift angle of the carrier of each rectifier is set to be separated by an angle of π / (N1+N2) between adjacent two rectifiers in the N1+N2 rectifiers, and the initial setting angle of the carrier of the N2 rectifiers is obtained.

[0020] extracting phase information of modulation waves of the N1 rectifiers and phase information of modulation waves of the N2 rectifiers, and setting phase-shifting angles of the carrier waves of the N2 rectifiers according to the phase information of the modulation waves of the N1 rectifiers, the phase information of the modulation waves of the N2 rectifiers, and the initial setting angle of the carrier waves of the N2 rectifiers;

[0021] setting phase-shifting angles of the carrier waves of the M rectifiers according to intervals of π / M angles between adjacent two rectifiers in the M rectifiers based on the phase information of the grid-side voltage signal;

[0022] setting the rated carrier frequency of the rectifier as the frequency of the carrier waves of the N1+N2+M rectifiers, wherein N=N1+N2, and N1 and N2 are positive integers greater than or equal to 1.

[0023] Optionally, the setting of the frequency and the phase-shifting angle of the carrier wave of each rectifier according to the phase information of the grid-side voltage signal, the operating power and the state information of each rectifier in the multi-rectifier further comprises:

[0024] If there are N1+N2+N3 rectifiers in normal operation and M rectifiers in shutdown in the multi-rectifier, and the operating power of the N1 rectifiers is equal to the first preset power, the deviation rate of the operating power of the N2 rectifiers from the first preset power is less than the first preset deviation rate, and the deviation rate of the operating power of the N3 rectifiers from the first preset power is greater than or equal to the first preset deviation rate and less than a second preset deviation rate, the following steps are performed:

[0025] setting phase-shifting angles of the carrier waves of the N1 rectifiers according to intervals of π / (N1+N2) angles between adjacent two rectifiers in the N1+N2 rectifiers based on the phase information of the grid-side voltage signal, and obtaining an initial setting angle of the carrier waves of the N2 rectifiers;

[0026] extracting phase information of modulation waves of the N1 rectifiers and phase information of modulation waves of the N2 rectifiers, and setting phase-shifting angles of the carrier waves of the N2 rectifiers according to the phase information of the modulation waves of the N1 rectifiers, the phase information of the modulation waves of the N2 rectifiers, and the initial setting angle of the carrier waves of the N2 rectifiers;

[0027] setting phase-shifting angles of the carrier waves of the N3 rectifiers according to intervals of π / N3 angles between adjacent two rectifiers in the N3 rectifiers based on the phase information of the grid-side voltage signal;

[0028] According to phase information of the grid-side voltage signal, phase angles of the carriers of the M rectifiers are set according to intervals of π / M between adjacent two of the M rectifiers.

[0029] According to a rated carrier frequency of the rectifier, a first carrier frequency is obtained, wherein the first carrier frequency is greater than the rated carrier frequency.

[0030] The rated carrier frequency of the rectifier is taken as frequencies of the carriers of N1+N2+M rectifiers, and the first carrier frequency is taken as frequencies of the carriers of N3 rectifiers, wherein N=N1+N2+N3, N1, N2, and N3 are positive integers greater than or equal to 1.

[0031] Optionally, the setting of the frequencies and the phase angles of the carriers of each rectifier according to the phase information of the grid-side voltage signal and the operating power and state information of each rectifier in the multi-rectifier further comprises:

[0032] If there are N1+N2+N3+N4 rectifiers in normal operation and M rectifiers in shutdown in the multi-rectifier, and the operating power of the N1 rectifiers is equal to the first preset power, the deviation rate of the operating power of the N2 rectifiers from the first preset power is less than the first preset deviation rate, the deviation rate of the operating power of the N3 rectifiers from the first preset power is greater than or equal to the first preset deviation rate and less than the second preset deviation rate, and the deviation rate of the operating power of the N4 rectifiers from the first preset power is greater than or equal to the second preset deviation rate, the following steps are performed:

[0033] According to phase information of the grid-side voltage signal, phase angles of the carriers of the N1 rectifiers are set according to intervals of π / (N1+N2) between adjacent two of the N1+N2 rectifiers, and initial setting angles of the carriers of the N2 rectifiers are obtained.

[0034] Phase information of the modulation waves of the N1 rectifiers and phase information of the modulation waves of the N2 rectifiers are extracted, and phase angles of the carriers of the N2 rectifiers are set according to the phase information of the modulation waves of the N1 rectifiers, the phase information of the modulation waves of the N2 rectifiers, and the initial setting angles.

[0035] According to phase information of the grid-side voltage signal, phase angles of the carriers of the N3 rectifiers are set according to intervals of π / N3 between adjacent two of the N3 rectifiers.

[0036] According to phase information of the grid-side voltage signal, phase-shifting angles of carrier waves of N4 rectifiers are set to be separated by an angle of π / N4 between adjacent two of the N4 rectifiers.

[0037] According to phase information of the grid-side voltage signal, phase-shifting angles of carrier waves of M rectifiers are set to be separated by an angle of π / M between adjacent two of the M rectifiers.

[0038] A first carrier frequency is obtained according to a rated carrier frequency of the rectifier, wherein the first carrier frequency is greater than the rated carrier frequency.

[0039] A second carrier frequency is obtained according to the rated carrier frequency of the rectifier, wherein the second carrier frequency is greater than the first carrier frequency.

[0040] The rated carrier frequency of the rectifier is taken as the frequency of carrier waves of N1+N2+M rectifiers, the first carrier frequency is taken as the frequency of carrier waves of N3 rectifiers, and the second carrier frequency is taken as the frequency of carrier waves of N4 rectifiers, wherein N=N1+N2+N3+N4, N1, N2, N3 and N4 are positive integers greater than or equal to 1.

[0041] Optionally, the obtaining of the grid-side voltage signal and the extraction of the phase information of the grid-side voltage signal comprise:

[0042] The grid-side voltage signal is obtained, and the phase information of the grid-side voltage signal is extracted through a phase-locked loop.

[0043] The application further provides a control device of a rectifier, which is applied to a multiple rectifier, the multiple rectifier comprising a transformer and a plurality of rectifiers, and the control device comprising:

[0044] A first obtaining module is configured to obtain a grid-side voltage signal and extract phase information of the grid-side voltage signal;

[0045] A second obtaining module is configured to obtain rectification current signals of the rectifiers;

[0046] A first processing module is configured to obtain operating power and state information of the rectifiers in the multiple rectifier according to the grid-side voltage signal, the rectification current signals and a transformation ratio of the transformer;

[0047] A second processing module is configured to set frequencies and phase-shifting angles of carrier waves of the rectifiers according to the phase information of the grid-side voltage signal and the operating power and state information of the rectifiers in the multiple rectifier;

[0048] The control module is configured to generate corresponding carrier waves and modulation waves according to the frequency and phase-shifting angle of the carrier wave of each rectifier to drive and control each rectifier.

[0049] Optionally, when the second processing module sets the frequency and phase-shifting angle of the carrier wave of each rectifier according to the phase information of the grid-side voltage signal, the operating power and state information of each rectifier in the multi-rectifier, the second processing module is specifically configured to:

[0050] If there are N+M rectifiers in normal operation in the multi-rectifier, and the operating power of the N+M rectifiers is equal to the first preset power, the phase-shifting angle of the carrier wave of each rectifier is set according to the interval of π / (N+M) angle between adjacent two rectifiers based on the phase information of the grid-side voltage signal, and the rated carrier frequency is taken as the frequency of the carrier wave of each rectifier, wherein N and M are positive integers greater than or equal to 1.

[0051] If there are N rectifiers in normal operation and M rectifiers in shutdown in the multi-rectifier, and the operating power of the N rectifiers is equal to the first preset power, the phase-shifting angle of the carrier wave of each rectifier is set according to the interval of π / N angle between adjacent two rectifiers in the N rectifiers based on the phase information of the grid-side voltage signal, the phase-shifting angle of the carrier wave of each rectifier is set according to the interval of π / M angle between adjacent two rectifiers in the M rectifiers, and the rated carrier frequency of the rectifier is taken as the frequency of the carrier wave of the M+N rectifiers.

[0052] Optionally, when the second processing module sets the frequency and phase-shifting angle of the carrier wave of each rectifier according to the phase information of the grid-side voltage signal, the operating power and state information of each rectifier in the multi-rectifier, the second processing module is specifically configured to:

[0053] If there are N1+N2 rectifiers in normal operation and M rectifiers in shutdown in the multi-rectifier, and the operating power of the N1 rectifiers is equal to the first preset power, and the deviation rate of the operating power of the N2 rectifiers from the first preset power is less than a first preset deviation rate, the following steps are performed:

[0054] The phase-shifting angle of the carrier wave of each rectifier is set according to the interval of π / (N1+N2) angle between adjacent two rectifiers in the N1+N2 rectifiers based on the phase information of the grid-side voltage signal, and the initial setting angle of the carrier wave of the N2 rectifiers is obtained.

[0055] extracting phase information of modulation waves of the N1 rectifiers and phase information of modulation waves of the N2 rectifiers, and setting phase-shifting angles of the carrier waves of the N2 rectifiers according to the phase information of the modulation waves of the N1 rectifiers, the phase information of the modulation waves of the N2 rectifiers, and the initial setting angle of the carrier waves of the N2 rectifiers;

[0056] setting phase-shifting angles of the carrier waves of the M rectifiers according to intervals of π / M angles between adjacent two rectifiers in the M rectifiers based on the phase information of the grid-side voltage signal;

[0057] setting the rated carrier frequency of the rectifier as the frequency of the carrier waves of the N1+N2+M rectifiers, wherein N=N1+N2, and N1 and N2 are positive integers greater than or equal to 1.

[0058] Optionally, when the second processing module executes the setting of the frequency and the phase-shifting angle of the carrier wave of each rectifier according to the phase information of the grid-side voltage signal, the operating power and the state information of each rectifier in the multi-rectifier, the second processing module is further configured to:

[0059] if there are N1+N2+N3 rectifiers in normal operation and M rectifiers in shutdown in the multi-rectifier, and the operating power of the N1 rectifiers is equal to the first preset power, the deviation rate of the operating power of the N2 rectifiers from the first preset power is less than the first preset deviation rate, and the deviation rate of the operating power of the N3 rectifiers from the first preset power is greater than or equal to the first preset deviation rate and less than a second preset deviation rate, the second processing module executes the following steps:

[0060] setting phase-shifting angles of the carrier waves of the N1 rectifiers according to intervals of π / (N1+N2) angles between adjacent two rectifiers in the N1+N2 rectifiers based on the phase information of the grid-side voltage signal, and obtaining an initial setting angle of the carrier waves of the N2 rectifiers;

[0061] extracting phase information of modulation waves of the N1 rectifiers and phase information of modulation waves of the N2 rectifiers, and setting phase-shifting angles of the carrier waves of the N2 rectifiers according to the phase information of the modulation waves of the N1 rectifiers, the phase information of the modulation waves of the N2 rectifiers, and the initial setting angle of the carrier waves of the N2 rectifiers;

[0062] setting phase-shifting angles of the carrier waves of the N3 rectifiers according to intervals of π / N3 angles between adjacent two rectifiers in the N3 rectifiers based on the phase information of the grid-side voltage signal;

[0063] According to phase information of the grid-side voltage signal, phase angles of carriers of M rectifiers are set according to intervals of π / M between adjacent two of the M rectifiers.

[0064] According to a rated carrier frequency of the rectifier, a first carrier frequency is obtained, wherein the first carrier frequency is greater than the rated carrier frequency.

[0065] The rated carrier frequency of the rectifier is taken as frequencies of carriers of N1+N2+M rectifiers, and the first carrier frequency is taken as frequencies of carriers of N3 rectifiers, wherein N=N1+N2+N3, N1, N2, and N3 are positive integers greater than or equal to 1.

[0066] Optionally, when the second processing module executes the setting of the frequencies and the phase angles of the carriers of each rectifier according to the phase information of the grid-side voltage signal, the operating power and the state information of each rectifier in the multi-rectifier, the second processing module is further used for:

[0067] If there are N1+N2+N3+N4 rectifiers in normal operation and M rectifiers in shutdown in the multi-rectifier, and the operating power of the N1 rectifiers is equal to the first preset power, the deviation rate of the operating power of the N2 rectifiers from the first preset power is less than the first preset deviation rate, the deviation rate of the operating power of the N3 rectifiers from the first preset power is greater than or equal to the first preset deviation rate and less than the second preset deviation rate, and the deviation rate of the operating power of the N4 rectifiers from the first preset power is greater than or equal to the second preset deviation rate, the following steps are executed:

[0068] According to phase information of the grid-side voltage signal, phase angles of carriers of N1 rectifiers are set according to intervals of π / (N1+N2) between adjacent two of the N1+N2 rectifiers, and initial setting angles of carriers of N2 rectifiers are obtained;

[0069] Phase information of modulation waves of the N1 rectifiers and phase information of modulation waves of the N2 rectifiers are extracted, and phase angles of carriers of the N2 rectifiers are set according to the phase information of the modulation waves of the N1 rectifiers, the phase information of the modulation waves of the N2 rectifiers, and the initial setting angles;

[0070] According to phase information of the grid-side voltage signal, phase angles of carriers of N3 rectifiers are set according to intervals of π / N3 between adjacent two of the N3 rectifiers;

[0071] According to phase information of the grid-side voltage signal, phase-shifting angles of carriers of N4 rectifiers are set to be separated by an angle of π / N4 between adjacent two of the N4 rectifiers.

[0072] According to phase information of the grid-side voltage signal, phase-shifting angles of carriers of M rectifiers are set to be separated by an angle of π / M between adjacent two of the M rectifiers.

[0073] A first carrier frequency is obtained according to a rated carrier frequency of the rectifier, wherein the first carrier frequency is greater than the rated carrier frequency.

[0074] A second carrier frequency is obtained according to the rated carrier frequency of the rectifier, wherein the second carrier frequency is greater than the first carrier frequency.

[0075] The rated carrier frequency of the rectifier is taken as a frequency of carriers of N1+N2+M rectifiers, the first carrier frequency is taken as a frequency of carriers of N3 rectifiers, and the second carrier frequency is taken as a frequency of carriers of N4 rectifiers, wherein N=N1+N2+N3+N4, N1, N2, N3 and N4 are positive integers greater than or equal to 1.

[0076] Optionally, the first acquisition module, when acquiring the grid-side voltage signal and extracting phase information of the grid-side voltage signal, is specifically configured to:

[0077] The grid-side voltage signal is acquired, and phase information of the grid-side voltage signal is extracted through a phase-locked loop.

[0078] The application further provides a control system of a rectifier, which comprises the control device, a voltage acquisition device and a plurality of current acquisition devices.

[0079] The voltage acquisition device is configured to acquire a high-voltage analog grid-side voltage signal, perform voltage reduction and analog-digital conversion processing on the high-voltage analog grid-side voltage signal, obtain a low-voltage digital grid-side voltage signal, and output the low-voltage digital grid-side voltage signal.

[0080] Each current acquisition device is configured to acquire an analog rectifier current signal of each rectifier, perform analog-digital conversion processing on the acquired analog rectifier current signal, obtain a digital rectifier current signal, and output the digital rectifier current signal.

[0081] Optionally, the voltage acquisition device comprises a voltage sensor, a voltage dividing circuit and a first analog-digital converter, and the current acquisition device comprises a current sensor and a second analog-digital converter.

[0082] A first end of the voltage sensor is connected to a power grid.

[0083] a second end of the voltage sensor is connected with a first end of the voltage dividing circuit;

[0084] a second end of the voltage dividing circuit is connected with a first end of the first analog-digital converter;

[0085] a second end of the first analog-digital converter is connected with the control device;

[0086] a first end of each of the current sensors is connected with each of the rectifiers one by one;

[0087] a second end of each of the current sensors is connected with a first end of the second analog-digital converter;

[0088] a second end of the second analog-digital converter is connected with the control device.

[0089] The application further provides a control device of a rectifier, comprising the control system and the multiple rectifier as described in any one of the above, the multiple rectifier comprising a transformer and a plurality of rectifiers, the rectifier comprising a first resistor, a first inductor, a full-bridge rectifier circuit, a second inductor, a first capacitor and a second capacitor;

[0090] a first end and a second end of a primary side of the transformer are connected with a power grid;

[0091] a first end of a secondary side of the transformer is connected with a first end of the first resistor;

[0092] a second end of the first resistor is connected with a first end of the first inductor;

[0093] a second end of the first inductor is connected with a first end of the full-bridge rectifier circuit;

[0094] a second end of the full-bridge rectifier circuit is connected with a first end of the second inductor and a first end of the first capacitor;

[0095] a second end of the second inductor is connected with a first end of the second capacitor;

[0096] a second end of the first capacitor and a second end of the second capacitor are connected with a third end of the full-bridge rectifier circuit;

[0097] a fourth end of the full-bridge rectifier circuit is connected with a second end of the secondary side of the transformer.

[0098] Optionally, the rectifier further comprises a second resistor, a third inductor and a third capacitor;

[0099] a third end of the secondary side of the transformer is connected with a first end of the second resistor;

[0100] The second end of the second resistor is connected with the first end of the third inductor;

[0101] The second end of the third inductor is connected with the first end of the third capacitor;

[0102] The second end of the third capacitor is connected with the fourth end of the secondary side of the transformer.

[0103] Compared with the prior art, the control method, device, system and equipment of the rectifier provided by the application can obtain a grid-side voltage signal, extract phase information of the grid-side voltage signal, obtain rectification current signals of each rectifier, obtain operation power and state information of each rectifier in the multi-rectifier according to the grid-side voltage signal, the rectification current signals of each rectifier and a transformation ratio of a transformer, set a frequency and a phase-shifting angle of a carrier of each rectifier according to the phase information of the grid-side voltage signal and the operation power and state information of each rectifier in the multi-rectifier, and generate corresponding carriers and modulation waves to drive and control each rectifier. In the application, the number of rectifiers in normal operation can be determined according to the state information of each rectifier in the multi-rectifier, and the frequency and the phase-shifting angle of the carrier of each rectifier in normal operation can be dynamically adjusted according to the number of rectifiers in normal operation and the size of the operation power of each rectifier, so that the distribution of harmonics in the grid-side current can be changed, the harmonics in the grid-side current can be effectively suppressed, and the risk of overheat, abnormal vibration of devices and breakdown and damage of capacitors of the transformer in the multi-rectifier can be effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0104] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0105] FIG. 1 is a flowchart of a control method of a rectifier disclosed by an embodiment of the application;

[0106] FIG. 2 is a structural block diagram of a control device of a rectifier disclosed by an embodiment of the application;

[0107] FIG. 3 is a structural block diagram of a control system of a rectifier disclosed by an embodiment of the application;

[0108] FIG. 4 is a structural block diagram of a control device of a rectifier disclosed by an embodiment of the application;

[0109] FIG. 5 is a circuit diagram of a multi-rectifier disclosed by an embodiment of the application;

[0110] Fig. 6 is a circuit diagram of another multiplex rectifier disclosed in embodiments of the present application;

[0111] Fig. 7 is a circuit diagram of a rectifier disclosed in embodiments of the present application. DETAILED DESCRIPTION

[0112] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0113] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0114] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0115] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" or "several" is two or more, unless otherwise explicitly specified.

[0116] It should be understood that the structures, proportions, sizes, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, to enable those skilled in the art to understand and read, and are not used to limit the conditions that can be implemented by the present application, and therefore do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, which does not affect the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0117] As shown in FIG. 1, the embodiment of the present application provides a control method of a rectifier, applied to a multiple rectifier, the multiple rectifier comprising a transformer and a plurality of rectifiers, the method comprising:

[0118] S1, acquiring a grid-side voltage signal and extracting phase information of the grid-side voltage signal;

[0119] In the embodiment, the voltage sensor can be used to collect the high-voltage analog grid-side voltage signal u s , i.e. the voltage of the power grid, and then the voltage dividing circuit is used to step down the high-voltage analog grid-side voltage signal to obtain a low-voltage analog grid-side voltage signal, and then the first analog-to-digital converter is used to perform analog-to-digital conversion on the low-voltage analog grid-side voltage signal to obtain a low-voltage digital grid-side voltage signal, so as to acquire the low-voltage digital grid-side voltage signal and extract the phase information of the low-voltage digital grid-side voltage signal.

[0120] S2, acquiring a rectification current signal of each rectifier;

[0121] In the embodiment, the current sensor can be used to collect the analog rectification current signal i N of each rectifier, and then the second analog-to-digital converter is used to perform analog-to-digital conversion on each analog rectification current signal to obtain a digital rectification current signal, so as to acquire the digital rectification current signal of each rectifier.

[0122] S3, obtaining the operating power and state information of each rectifier in the multiple rectifier according to the grid-side voltage signal, the rectification current signal of each rectifier and the transformation ratio of the transformer;

[0123] In the embodiment, the low-voltage digital grid-side voltage signal is multiplied by the digital rectification current signal of the first rectifier, and then divided by the transformation ratio of the transformer connected to the rectifier, so as to obtain the operating power of the first rectifier, and in this way, the operating power of the remaining rectifiers is obtained. If the operating power of a certain rectifier is 0, it means that there is no rectification current in the rectifier, i.e. the state information of the rectifier can be determined as shutdown, and if the operating power of a certain rectifier is greater than 0, it means that the rectifier is in normal operation, i.e. the state information of the rectifier can be determined as normal operation, so that the number of rectifiers in normal operation in the multiple rectifier and the operating power of each rectifier in normal operation can be obtained.

[0124] S4, setting the frequency and phase-shifting angle of the carrier of each rectifier according to the phase information of the grid-side voltage signal, the operating power and state information of each rectifier in the multiple rectifier;

[0125] In the embodiment, the frequency and the phase shift angle of the carrier of each rectifier can be set according to the phase information of the grid-side voltage signal, the number of rectifiers in normal operation and the magnitude of the operating power of each rectifier, and the frequency and the phase shift angle of the carrier of each rectifier can be dynamically adjusted when the number of rectifiers in normal operation and / or the magnitude of the operating power of each rectifier changes.

[0126] S5, generating corresponding carrier and modulation wave according to the frequency and the phase shift angle of the carrier of each rectifier to drive and control each rectifier.

[0127] In the embodiment, the rectifier can include a full-bridge rectifier circuit, the full-bridge rectifier circuit can include a plurality of switching tubes, specifically, the full-bridge rectifier circuit can include four IGBTs (Insulated Gate Bipolar Transistor), and the corresponding carrier and modulation wave can be generated according to the frequency and the phase shift angle of the carrier of each rectifier to drive and control the IGBT in each rectifier.

[0128] The control method of the rectifier in the embodiment can be applied not only to single-phase multi-rectifier but also to three-phase multi-rectifier.

[0129] Compared with the prior art, the control method, device, system and equipment of the rectifier provided by the application can obtain the grid-side voltage signal, extract the phase information of the grid-side voltage signal, obtain the rectification current signal of each rectifier, obtain the operating power and the state information of each rectifier in the multi-rectifier according to the grid-side voltage signal, each rectification current signal and the transformation ratio of the transformer, set the frequency and the phase shift angle of the carrier of each rectifier according to the phase information of the grid-side voltage signal and the operating power and the state information of each rectifier in the multi-rectifier, generate the corresponding carrier and modulation wave according to the frequency and the phase shift angle of the carrier of each rectifier to drive and control each rectifier, and in the application, the number of rectifiers in normal operation can be determined according to the state information of each rectifier in the multi-rectifier, and the frequency and the phase shift angle of the carrier of each rectifier in normal operation can be dynamically adjusted according to the number of rectifiers in normal operation and the magnitude of the operating power of each rectifier, so that the distribution of the harmonics in the grid-side current can be changed, the harmonics in the grid-side current can be effectively suppressed, and the risk of overheat, abnormal vibration of devices and breakdown and damage of capacitors of the transformer in the multi-rectifier can be effectively reduced.

[0130] As an embodiment, in the embodiment of the application, step S4 includes:

[0131] S411, if there are N+M rectifiers in normal operation in the multiple rectifier, and the operating power of the N+M rectifiers is equal to the first preset power, then based on the phase information of the grid-side voltage signal, the phase shift angle of the carrier of each rectifier is set according to the interval of π / (N+M) angle between adjacent two rectifiers, and the rated carrier frequency is taken as the frequency of the carrier of each rectifier, wherein N and M are both positive integers greater than or equal to 1.

[0132] In the embodiment, the first preset power is a pre-set power, π is a circular constant, if there are N+M rectifiers in normal operation in the multiple rectifier, and the operating power of the N+M rectifiers is equal to the first preset power, then the phase information of the grid-side voltage signal is taken as the reference, the phase shift angle of the carrier of each rectifier is set according to the interval of π / (N+M) angle between adjacent two rectifiers, that is, the carrier of the N+M rectifiers in normal operation is uniformly phase shifted, and the rated carrier frequency f sw1 is taken as the frequency of the carrier of each rectifier.

[0133] S412, if there are N rectifiers in normal operation and M rectifiers in shutdown in the multiple rectifier, and the operating power of the N rectifiers is equal to the first preset power, then based on the phase information of the grid-side voltage signal, the phase shift angle of the carrier of the N rectifiers is set according to the interval of π / N angle between adjacent two rectifiers in the N rectifiers, the phase shift angle of the carrier of the M rectifiers is set according to the interval of π / M angle between adjacent two rectifiers in the M rectifiers, and the rated carrier frequency of the rectifier is taken as the frequency of the carrier of the M+N rectifiers.

[0134] In the embodiment, if there are N rectifiers in normal operation and M rectifiers in shutdown in the multiple rectifier, and the operating power of the N rectifiers is equal to the first preset power, then the phase information of the grid-side voltage signal is taken as the reference, the phase shift angle of the carrier of the N rectifiers is set according to the interval of π / N angle between adjacent two rectifiers in the N rectifiers, that is, the carrier of the N rectifiers in normal operation is uniformly phase shifted, the phase shift angle of the carrier of the M rectifiers is set according to the interval of π / M angle between adjacent two rectifiers in the M rectifiers, and the rated carrier frequency f sw1 of the rectifier is taken as the frequency of the carrier of the M+N rectifiers, if the harmonic content in the grid-side current is still excessive, the frequency of the carrier of the N rectifiers can be dynamically adjusted synchronously, specifically, the carrier frequency can be increased or decreased within the operating range, or the carrier of the N rectifiers can be offset by an angle (π / N+θ), wherein |θ|<π / N, by adjusting the carrier frequency and the phase shift angle, the harmonic frequency spectrum distribution is dynamically adjusted and changed, and the specific harmonic is reduced.

[0135] In one embodiment of this application, step S4 further includes:

[0136] S421. If the multiplexed rectifier has N1+N2 rectifiers operating normally and M rectifiers shut down, and the operating power of the N1 rectifiers is equal to the first preset power, and the deviation rate of the operating power of the N2 rectifiers from the first preset power is less than the first preset deviation rate, then perform the following steps:

[0137] In this embodiment, the first preset deviation rate is a pre-set deviation rate, which can be 20%. If there are N1+N2 rectifiers operating normally and M rectifiers shut down in the multiplexed rectifier, and the operating power of the N1 rectifiers is equal to the first preset power, and the deviation rate between the operating power of the N2 rectifiers and the first preset power is less than 20%, then steps S422 to S425 are executed.

[0138] S422. Based on the phase information of the grid-side voltage signal, according to the angle π / (N1+N2) between two adjacent rectifiers in N1+N2 rectifiers, set the phase shift angle of the carrier of N1 rectifiers, and obtain the initial set angle of the carrier of N2 rectifiers.

[0139] In this embodiment, based on the phase information of the grid-side voltage signal, and according to the angle π / (N1+N2) between two adjacent rectifiers in the N1+N2 rectifiers, the phase shift angle of the carrier of the N1 rectifiers is obtained and set, and the initial setting angle of the carrier of the N2 rectifiers is obtained.

[0140] S423. Extract the phase information of the modulation waves of N1 rectifiers and the phase information of the modulation waves of N2 rectifiers. Based on the phase information of the modulation waves of N1 rectifiers, the phase information of the modulation waves of N2 rectifiers and the initial set angle, set the phase shift angle of the carrier of N2 rectifiers.

[0141] In this embodiment, the phase information α0…α of the modulation waves of N1 rectifiers is extracted. n1， Extract the phase information of the modulation waves from N2 rectifiers, and calculate and obtain the phase information α0…α of the modulation waves from N1 rectifiers. n1 The average phase α ave The phase average value β of the modulation wave of N2 rectifiers is calculated and obtained. ave Then according to α ave and β ave Obtain the modulation wave compensation angle β 补 ,β 补 =α ave -β ave Then add β to the initial angle setting. 补, and the phase-shifting angles of the carriers of the N2 rectifiers are obtained and set.

[0142] S424, based on the phase information of the grid-side voltage signal, the phase-shifting angles of the carriers of the M rectifiers are set according to the interval of π / M angle between adjacent two rectifiers in the M rectifiers;

[0143] S425, the rated carrier frequency of the rectifier is taken as the frequency of the carriers of the N1+N2+M rectifiers, wherein N=N1+N2, and N1 and N2 are positive integers greater than or equal to 1.

[0144] In the embodiment, the rated carrier frequency f sw1 as the frequency of the carriers of the N1+N2+M rectifiers.

[0145] As an implementation form, in the embodiment of the application, the step S4 further includes:

[0146] S431, if there are N1+N2+N3 rectifiers in normal operation and M rectifiers in shutdown in the multiple rectifiers, and the operating power of the N1 rectifiers is equal to the first preset power, the deviation rate of the operating power of the N2 rectifiers from the first preset power is less than the first preset deviation rate, and the deviation rate of the operating power of the N3 rectifiers from the first preset power is greater than or equal to the first preset deviation rate and less than the second preset deviation rate, the following steps are executed:

[0147] In the embodiment, the second preset deviation rate is a preset deviation rate, and the second preset deviation rate can be 50%. If there are N1+N2+N3 rectifiers in normal operation and M rectifiers in shutdown in the multiple rectifiers, and the operating power of the N1 rectifiers is equal to the first preset power, the deviation rate of the operating power of the N2 rectifiers from the first preset power is less than 20%, and the deviation rate of the operating power of the N3 rectifiers from the first preset power is greater than or equal to 20% and less than 50%, the steps S432 to S437 are executed.

[0148] S432, based on the phase information of the grid-side voltage signal, the phase-shifting angles of the carriers of the N1 rectifiers are set according to the interval of π / (N1+N2) angle between adjacent two rectifiers in the N1+N2 rectifiers, and the initial setting angles of the carriers of the N2 rectifiers are obtained;

[0149] S433, the phase information of the modulation wave of the N1 rectifiers and the phase information of the modulation wave of the N2 rectifiers are extracted, and the phase-shifting angles of the carriers of the N2 rectifiers are set according to the phase information of the modulation wave of the N1 rectifiers, the phase information of the modulation wave of the N2 rectifiers, and the initial setting angles;

[0150] S434, based on the phase information of the grid-side voltage signal, setting the phase-shifting angle of the carrier of the N3 rectifiers according to the interval of π / N3 angle between adjacent two rectifiers in the N3 rectifiers;

[0151] In this embodiment, based on the phase information of the grid-side voltage signal, the phase-shifting angle of the carrier of the N3 rectifiers is set according to the interval of π / N3 angle between adjacent two rectifiers in the N3 rectifiers, that is, the carrier of the N3 rectifiers is uniformly phase-shifted.

[0152] S435, based on the phase information of the grid-side voltage signal, setting the phase-shifting angle of the carrier of the M rectifiers according to the interval of π / M angle between adjacent two rectifiers in the M rectifiers;

[0153] S436, obtaining a first carrier frequency according to the rated carrier frequency of the rectifier, wherein the first carrier frequency is greater than the rated carrier frequency;

[0154] In this embodiment, the first carrier frequency f sw2 may be obtained by increasing the rated carrier frequency of the rectifier. sw1 Preferably, 1.5*f sw2 <2*f sw1 .

[0155] S437, taking the rated carrier frequency of the rectifier as the frequency of the carrier of the N1+N2+M rectifiers, and taking the first carrier frequency as the frequency of the carrier of the N3 rectifiers, wherein N=N1+N2+N3, and N1, N2 and N3 are all positive integers greater than or equal to 1.

[0156] In this embodiment, the rated carrier frequency f sw1 of the rectifier is taken as the frequency of the carrier of the N1+N2+M rectifiers, and the first carrier frequency f sw2 is taken as the frequency of the carrier of the N3 rectifiers, which can effectively reduce the harmonic content in the grid-side current.

[0157] In this embodiment, the carrier of the N3 rectifiers can also be non-uniformly phase-shifted, and the rated carrier frequency f sw1 is taken as the frequency of the carrier of the N3 rectifiers. Specifically, the frequency and the phase-shifting angle of the carrier of the N3 rectifiers can be adjusted according to the harmonic content in the grid-side current.

[0158] As an implementation manner, in the embodiment of the present application, the step S4 further includes:

[0159] S441, if there are N1+N2+N3+N4 rectifiers in normal operation and M rectifiers in shutdown in the multiple rectifier, and the operating power of the N1 rectifiers is equal to the first preset power, the deviation rate of the operating power of the N2 rectifiers from the first preset power is less than the first preset deviation rate, the deviation rate of the operating power of the N3 rectifiers from the first preset power is greater than or equal to the first preset deviation rate and less than the second preset deviation rate, and the deviation rate of the operating power of the N4 rectifiers from the first preset power is greater than or equal to the second preset deviation rate, the following steps are executed:

[0160] In this embodiment, if there are N1+N2+N3+N4 rectifiers in normal operation and M rectifiers in shutdown in the multiple rectifier, and the operating power of the N1 rectifiers is equal to the first preset power, the deviation rate of the operating power of the N2 rectifiers from the first preset power is less than 20%, the deviation rate of the operating power of the N3 rectifiers from the first preset power is greater than or equal to 20% and less than 50%, and the deviation rate of the operating power of the N4 rectifiers from the first preset power is greater than or equal to 50%, steps S442 to S449 are executed.

[0161] S442, based on the phase information of the grid-side voltage signal, the phase shift angle of the carrier of the N1 rectifiers is set according to the interval of π / (N1+N2) degrees between adjacent two rectifiers in the N1+N2 rectifiers, and the initial setting angle of the carrier of the N2 rectifiers is obtained;

[0162] S443, the phase information of the modulation wave of the N1 rectifiers and the phase information of the modulation wave of the N2 rectifiers are extracted, and the phase shift angle of the carrier of the N2 rectifiers is set according to the phase information of the modulation wave of the N1 rectifiers, the phase information of the modulation wave of the N2 rectifiers and the initial setting angle;

[0163] S444, based on the phase information of the grid-side voltage signal, the phase shift angle of the carrier of the N3 rectifiers is set according to the interval of π / N3 degrees between adjacent two rectifiers in the N3 rectifiers;

[0164] S445, based on the phase information of the grid-side voltage signal, the phase shift angle of the carrier of the N4 rectifiers is set according to the interval of π / N4 degrees between adjacent two rectifiers in the N4 rectifiers;

[0165] In this embodiment, according to the phase information of the grid-side voltage signal as the reference, the phase shift angle of the carrier of the N4 rectifiers is set according to the interval of π / N4 degrees between adjacent two rectifiers in the N4 rectifiers, that is, the carrier of the N4 rectifiers is uniformly phase shifted.

[0166] S446, based on the phase information of the grid-side voltage signal, the phase shift angle of the carrier of the M rectifiers is set as π / M between adjacent two rectifiers in the M rectifiers;

[0167] S447, according to the rated carrier frequency of the rectifier, a first carrier frequency is obtained, wherein the first carrier frequency is greater than the rated carrier frequency;

[0168] S448, according to the rated carrier frequency of the rectifier, a second carrier frequency is obtained, wherein the second carrier frequency is greater than the first carrier frequency;

[0169] In this embodiment, the rated carrier frequency of the rectifier can be adjusted to obtain the adjusted second carrier frequency f sw3 , preferably, 2*f sw1 ≤f sw3 <3*f sw1 .

[0170] S449, the rated carrier frequency of the rectifier is taken as the frequency of the carrier of the N1+N2+M rectifiers, the first carrier frequency is taken as the frequency of the carrier of the N3 rectifiers, and the second carrier frequency is taken as the frequency of the carrier of the N4 rectifiers, wherein N=N1+N2+N3+N4, N1, N2, N3, N4 are all positive integers greater than or equal to 1.

[0171] In this embodiment, the rated carrier frequency f sw1 of the rectifier is taken as the frequency of the carrier of the N1+N2+M rectifiers, the first carrier frequency f sw2 is taken as the frequency of the carrier of the N3 rectifiers, and the second carrier frequency f sw3 is taken as the frequency of the carrier of the N4 rectifiers, which can effectively reduce the harmonic content in the grid-side current.

[0172] As an embodiment, in the embodiment of the application, the grid-side voltage signal is obtained, and the phase information of the grid-side voltage signal is extracted, which comprises:

[0173] The grid-side voltage signal is obtained, and the phase information of the grid-side voltage signal is extracted through a phase-locked loop.

[0174] In this embodiment, the phase-locked loop can be a parameter adaptive enhanced phase-locked loop, which can quickly and accurately capture the synchronous phase of the grid voltage. When the grid voltage is distorted, it also has good dynamic performance. The parameter adaptive enhanced phase-locked loop overcomes the adverse effects caused by the coupling characteristics of the traditional enhanced phase-locked loop. When the phase jumps, the frequency fluctuation can be suppressed, further improving the dynamic tracking performance and anti-interference of the phase-locked loop. Through the phase-locked loop, the high-frequency characteristic harmonics of the grid-side current of the multiple rectifiers are more concentrated, and the high-frequency harmonic band is avoided to be too wide.

[0175] As shown in FIG. 2, the embodiment of the present application further provides a control device 110 of a rectifier, which is applied to a multiple rectifier including a transformer and multiple rectifiers, and the control device 110 includes:

[0176] a first obtaining module 111, configured to obtain a grid-side voltage signal and extract phase information of the grid-side voltage signal;

[0177] a second obtaining module 112, configured to obtain rectification current signals of the multiple rectifiers;

[0178] a first processing module 113, configured to obtain operating power and state information of each rectifier in the multiple rectifier according to the grid-side voltage signal, the rectification current signals and a transformation ratio of the transformer;

[0179] a second processing module 114, configured to set a frequency and a phase-shifting angle of a carrier of each rectifier according to the phase information of the grid-side voltage signal and the operating power and the state information of each rectifier in the multiple rectifier;

[0180] a control module 115, configured to generate corresponding carriers and modulation waves to drive and control each rectifier according to the frequency and the phase-shifting angle of the carrier of each rectifier.

[0181] In the embodiment, the control device can be a total controller including the first obtaining module, the second obtaining module, the first processing module, the second processing module and the control module, or the control device can be a master controller and multiple slave controllers, the number of the slave controllers can be the same as the number of the multiple rectifiers, each slave controller obtains the grid-side voltage signal and extracts the phase information of the grid-side voltage signal, and sends the grid-side voltage signal to the master controller, each slave controller obtains the rectification current signals of the multiple rectifiers and sends the obtained rectification current signals of the multiple rectifiers to the master controller, the master controller obtains the operating power and the state information of each rectifier in the multiple rectifier according to the grid-side voltage signal, the rectification current signals and the transformation ratio of the transformer, and sends the operating power and the state information of each rectifier in the multiple rectifier to each slave controller, wherein the transformation ratio of the transformer can be pre-stored in the master controller, each slave controller sets the frequency and the phase-shifting angle of the carrier of each rectifier according to the phase information of the grid-side voltage signal and the operating power and the state information of each rectifier in the multiple rectifier, and generates corresponding carriers and modulation waves to drive and control each rectifier according to the frequency and the phase-shifting angle of the carrier of each rectifier.

[0182] In the embodiment, when each slave controller acquires the grid-side voltage signal, the grid-side voltage zero-crossing point can be taken as a synchronization trigger signal to start voltage sampling, so that the grid-side voltage zero-crossing point through the phase-locked loop realizes synchronized sampling.

[0183] As an implementation, in the embodiment, when the second processing module sets the frequency and the phase-shifting angle of the carrier of each rectifier according to the phase information of the grid-side voltage signal, the operating power and the state information of each rectifier in the multi-rectifier, the second processing module is specifically used for:

[0184] If there are N+M rectifiers normally operating in the multi-rectifier, and the operating power of the N+M rectifiers is equal to the first preset power, then based on the phase information of the grid-side voltage signal, the phase-shifting angle of the carrier of each rectifier is set according to the interval of π / (N+M) angle between adjacent two rectifiers, and the rated carrier frequency is taken as the frequency of the carrier of each rectifier, wherein N and M are positive integers greater than or equal to 1.

[0185] If there are N rectifiers normally operating and M rectifiers shutting down in the multi-rectifier, and the operating power of the N rectifiers is equal to the first preset power, then based on the phase information of the grid-side voltage signal, the phase-shifting angle of the carrier of the N rectifiers is set according to the interval of π / N angle between adjacent two rectifiers in the N rectifiers, the phase-shifting angle of the carrier of the M rectifiers is set according to the interval of π / M angle between adjacent two rectifiers in the M rectifiers, and the rated carrier frequency of the rectifier is taken as the frequency of the carrier of the M+N rectifiers.

[0186] As an implementation, in the embodiment, when the second processing module sets the frequency and the phase-shifting angle of the carrier of each rectifier according to the phase information of the grid-side voltage signal, the operating power and the state information of each rectifier in the multi-rectifier, the second processing module is specifically used for:

[0187] If there are N1+N2 rectifiers normally operating and M rectifiers shutting down in the multi-rectifier, and the operating power of the N1 rectifiers is equal to the first preset power, and the deviation rate of the operating power of the N2 rectifiers from the first preset power is less than the first preset deviation rate, then the following steps are performed:

[0188] Based on the phase information of the grid-side voltage signal, the phase-shifting angle of the carrier of the N1 rectifiers is set according to the interval of π / (N1+N2) angle between adjacent two rectifiers in the N1+N2 rectifiers, and the initial setting angle of the carrier of the N2 rectifiers is obtained.

[0189] extract phase information of the modulation wave of the N1 rectifiers and phase information of the modulation wave of the N2 rectifiers, and set the phase-shifting angle of the carrier of the N2 rectifiers according to the phase information of the modulation wave of the N1 rectifiers, the phase information of the modulation wave of the N2 rectifiers, and the initial setting angle of the carrier of the N2 rectifiers;

[0190] set the phase-shifting angle of the carrier of the M rectifiers according to the phase information of the grid-side voltage signal, and according to the interval of π / M angle between adjacent two rectifiers in the M rectifiers;

[0191] set the frequency of the carrier of the N1+N2+M rectifiers as the rated carrier frequency of the rectifiers, wherein N=N1+N2, N1 and N2 are positive integers greater than or equal to 1.

[0192] As an implementation manner, in the embodiment of the application, the second processing module, when performing the setting of the frequency and the phase-shifting angle of the carrier of each rectifier according to the phase information of the grid-side voltage signal, the operating power and the state information of each rectifier in the multi-rectifier, is further used for:

[0193] if there are N1+N2+N3 rectifiers in normal operation and M rectifiers in shutdown in the multi-rectifier, and the operating power of the N1 rectifiers is equal to the first preset power, the deviation rate of the operating power of the N2 rectifiers from the first preset power is less than the first preset deviation rate, and the deviation rate of the operating power of the N3 rectifiers from the first preset power is greater than or equal to the first preset deviation rate and less than the second preset deviation rate, the following steps are performed:

[0194] set the phase-shifting angle of the carrier of the N1 rectifiers according to the phase information of the grid-side voltage signal, and according to the interval of π / (N1+N2) angle between adjacent two rectifiers in the N1+N2 rectifiers, and obtain the initial setting angle of the carrier of the N2 rectifiers;

[0195] extract phase information of the modulation wave of the N1 rectifiers and phase information of the modulation wave of the N2 rectifiers, and set the phase-shifting angle of the carrier of the N2 rectifiers according to the phase information of the modulation wave of the N1 rectifiers, the phase information of the modulation wave of the N2 rectifiers, and the initial setting angle of the carrier of the N2 rectifiers;

[0196] set the phase-shifting angle of the carrier of the N3 rectifiers according to the phase information of the grid-side voltage signal, and according to the interval of π / N3 angle between adjacent two rectifiers in the N3 rectifiers;

[0197] set the phase-shifting angle of the carrier of the M rectifiers according to the phase information of the grid-side voltage signal, and according to the interval of π / M angle between adjacent two rectifiers in the M rectifiers;

[0198] According to a rated carrier frequency of the rectifier, a first carrier frequency is obtained, wherein the first carrier frequency is greater than the rated carrier frequency;

[0199] The rated carrier frequency of the rectifier is taken as the frequency of the carriers of the N1+N2+M rectifiers, and the first carrier frequency is taken as the frequency of the carriers of the N3 rectifiers, wherein N=N1+N2+N3, and N1, N2 and N3 are positive integers greater than or equal to 1.

[0200] As an implementation form, in the embodiment of the application, the second processing module, when performing the setting of the frequency and the phase-shifting angle of the carrier of each rectifier according to the phase information of the grid-side voltage signal, the operating power and the state information of each rectifier in the multi-rectifier, is further used for:

[0201] If there are N1+N2+N3+N4 rectifiers in normal operation and M rectifiers in shutdown in the multi-rectifier, and the operating power of the N1 rectifiers is equal to the first preset power, the deviation rate of the operating power of the N2 rectifiers from the first preset power is less than the first preset deviation rate, the deviation rate of the operating power of the N3 rectifiers from the first preset power is greater than or equal to the first preset deviation rate and less than the second preset deviation rate, and the deviation rate of the operating power of the N4 rectifiers from the first preset power is greater than or equal to the second preset deviation rate, the following steps are performed:

[0202] Based on the phase information of the grid-side voltage signal, the phase-shifting angle of the carrier of the N1 rectifiers is set according to the interval of π / (N1+N2) angle between adjacent two rectifiers in the N1+N2 rectifiers, and the initial setting angle of the carrier of the N2 rectifiers is obtained;

[0203] The phase information of the modulation wave of the N1 rectifiers and the phase information of the modulation wave of the N2 rectifiers are extracted, and the phase-shifting angle of the carrier of the N2 rectifiers is set according to the phase information of the modulation wave of the N1 rectifiers, the phase information of the modulation wave of the N2 rectifiers and the initial setting angle;

[0204] Based on the phase information of the grid-side voltage signal, the phase-shifting angle of the carrier of the N3 rectifiers is set according to the interval of π / N3 angle between adjacent two rectifiers in the N3 rectifiers;

[0205] Based on the phase information of the grid-side voltage signal, the phase-shifting angle of the carrier of the N4 rectifiers is set according to the interval of π / N4 angle between adjacent two rectifiers in the N4 rectifiers;

[0206] Based on the phase information of the grid-side voltage signal, the phase-shifting angle of the carrier of the M rectifiers is set according to the interval of π / M angle between adjacent two rectifiers in the M rectifiers;

[0207] According to a rated carrier frequency of the rectifier, a first carrier frequency is obtained, wherein the first carrier frequency is greater than the rated carrier frequency;

[0208] According to a rated carrier frequency of the rectifier, a second carrier frequency is obtained, wherein the second carrier frequency is greater than the first carrier frequency;

[0209] The rated carrier frequency of the rectifier is taken as the frequency of the carrier of the N1+N2+M rectifiers, the first carrier frequency is taken as the frequency of the carrier of the N3 rectifiers, and the second carrier frequency is taken as the frequency of the carrier of the N4 rectifiers, wherein N=N1+N2+N3+N4, N1, N2, N3, and N4 are positive integers greater than or equal to 1.

[0210] As an implementation form, in the embodiment of the application, when the first acquisition module is used to acquire the grid-side voltage signal and extract the phase information of the grid-side voltage signal, it is specifically used for:

[0211] The grid-side voltage signal is acquired, and the phase information of the grid-side voltage signal is extracted through a phase-locked loop.

[0212] As shown in FIG. 3, the application embodiment further provides a control system 100 of a rectifier, comprising the control device 110, the voltage acquisition device 120, and the plurality of current acquisition devices 130 according to any one of the above;

[0213] In the embodiment, the number of the current acquisition devices can be the same as the multiplicity of the multi-rectifier, specifically, the plurality of current acquisition devices can be N+M current acquisition devices.

[0214] The voltage acquisition device 120 is used to acquire the high-voltage analog grid-side voltage signal, and perform voltage reduction and analog-digital conversion processing on the high-voltage analog grid-side voltage signal to obtain and output a low-voltage digital grid-side voltage signal;

[0215] In the embodiment, the voltage acquisition device 120 acquires the high-voltage analog grid-side voltage signal, and performs voltage reduction and analog-digital conversion processing on the high-voltage analog grid-side voltage signal to obtain and output a low-voltage digital grid-side voltage signal to the control device 110.

[0216] Each current acquisition device 130 is used to acquire the analog rectification current signal of each rectifier 210, and perform analog-digital conversion processing on each acquired analog rectification current signal to obtain and output a digital rectification current signal.

[0217] In the embodiment, each current acquisition device 130 acquires the analog rectification current signal of each rectifier, and performs analog-digital conversion processing on each acquired analog rectification current signal to obtain and output a digital rectification current signal to the control device 110.

[0218] As shown in FIG. 3, as an implementation, in the embodiment of the application, the voltage collection device 120 includes a voltage sensor 121, a voltage dividing circuit 122 and a first analog-digital converter 123, and the current collection device 130 includes a current sensor 131 and a second analog-digital converter 132; a first end of the voltage sensor 121 is connected with the power grid; a second end of the voltage sensor 121 is connected with a first end of the voltage dividing circuit 122; a second end of the voltage dividing circuit 122 is connected with a first end of the first analog-digital converter 123; a second end of the first analog-digital converter 123 is connected with the control device 110; a first end of each current sensor 131 is connected with each rectifier 210 one by one; a second end of each current sensor 131 is connected with a first end of the second analog-digital converter 132; a second end of the second analog-digital converter 132 is connected with the control device 110.

[0219] In the embodiment, the voltage sensor can collect the high-voltage analog grid-side voltage signal u s that is, collect the voltage of the power grid, then the voltage dividing circuit can reduce the voltage of the high-voltage analog grid-side voltage signal to obtain a low-voltage analog grid-side voltage signal, and then the first analog-digital converter can perform analog-digital conversion processing on the low-voltage analog grid-side voltage signal to obtain and output a low-voltage digital grid-side voltage signal to the control device, and each current sensor can collect an analog rectifier current signal i N， of each rectifier, and then each second analog-digital converter can perform analog-digital conversion processing on each analog rectifier current signal to obtain a digital rectifier current signal, and the control device can obtain the digital rectifier current signal of each rectifier.

[0220] As shown in FIG. 4 and FIG. 5, the application further provides a rectifier control device, which includes the control system 100 of any one of the above and a multiple rectifier 200, and the multiple rectifier 200 includes a transformer T and a plurality of rectifiers 210, and each rectifier 210 includes a first resistor R1, a first inductor L1, a full-bridge rectifier circuit 211, a second inductor L2, a first capacitor C1 and a second capacitor C2; a first end and a second end of a primary side of the transformer T are connected with the power grid; a first end of a secondary side of the transformer T is connected with a first end of the first resistor R1; a second end of the first resistor R1 is connected with a first end of the first inductor L1; a second end of the first inductor L1 is connected with a first end of the full-bridge rectifier circuit 211; a second end of the full-bridge rectifier circuit 211 is connected with a first end of the second inductor L2 and a first end of the first capacitor C1; a second end of the second inductor L2 is connected with a first end of the second capacitor C2; a second end of the first capacitor C1 and a second end of the second capacitor C2 are connected with a third end of the full-bridge rectifier circuit 211; a fourth end of the full-bridge rectifier circuit 211 is connected with a second end of the secondary side of the transformer T.

[0221] In this embodiment, us represents the voltage of the power grid, the first inductance L1 is an inductance for filtering, the first resistance R1 is an alternating current equivalent resistance, is is a grid-side current, u N(t) The secondary side voltage of the transformer T, i N is a rectified current, u ab represents a rectified alternating current side voltage, U dc represents an intermediate direct current voltage, the first capacitor C1 can be a direct current side support capacitor, R L is a back-end load of the rectifier 200, the back-end can be a resistive and inductive load, the back-end can also be connected to an inverter (single-phase or three-phase) load, and the filter circuit composed of L2 and C2 is used to filter out the harmonics of the specific direct current circuit.

[0222] In this embodiment, the rectifier can be a single-phase PWM rectifier, and the full-bridge rectifier circuit can include four IGBTs.

[0223] As shown in FIGS. 5 and 6, in this embodiment, in the multi-rectifier, there can be one transformer T, or there can be as many transformers T as the number of the multi-rectifier, and both topologies can use the control method of the rectifier in this application to increase the leakage inductance of each secondary winding to achieve suppression of high-frequency harmonics.

[0224] As shown in FIG. 7, as an implementation manner, in this embodiment, the rectifier 210 further includes a second resistance R2, a third inductance L3, and a third capacitor C3; a third end of the secondary side of the transformer T is connected to a first end of the second resistance R2; a second end of the second resistance R2 is connected to a first end of the third inductance L3; a second end of the third inductance L3 is connected to a first end of the third capacitor C3; and a second end of the third capacitor C3 is connected to a fourth end of the secondary side of the transformer T.

[0225] In this embodiment, the RLC filter circuit composed of the second resistance R2, the third inductance L3, and the third capacitor C3 can have a good attenuation effect on high-frequency harmonics of a specific frequency band, further improving the effect of harmonic suppression in the grid-side current.

[0226] It should be understood that, in this application, if "system", "device", "unit" and / or "module" are used, it is only a method for distinguishing different components, elements, parts, portions or assemblies at different levels. However, if other words can achieve the same purpose, the words can be replaced by other expressions.

[0227] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0228] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method of a rectifier characterized by, The method is applied to a multiple rectifier including a transformer and multiple rectifiers, and comprises: obtaining a grid-side voltage signal and extracting phase information of the grid-side voltage signal; obtaining rectification current signals of the rectifiers; obtaining operating power and state information of each of the rectifiers in the multiple rectifier according to the grid-side voltage signal, the rectification current signals and a transformation ratio of the transformer; setting a frequency and a phase-shifting angle of a carrier of each of the rectifiers according to the phase information of the grid-side voltage signal and the operating power and state information of each of the rectifiers in the multiple rectifier; generating corresponding carriers and modulation waves to drive and control each of the rectifiers according to the frequency and the phase-shifting angle of the carrier of each of the rectifiers.

2. The control method according to claim 1, characterized by, The setting of the frequency and the phase-shifting angle of the carrier of each of the rectifiers according to the phase information of the grid-side voltage signal and the operating power and state information of each of the rectifiers in the multiple rectifier comprises: if there are N+M rectifiers normally operating in the multiple rectifier and the operating power of the N+M rectifiers is equal to a first preset power, setting the phase-shifting angle of the carrier of each of the rectifiers according to the phase information of the grid-side voltage signal and the interval of π / (N+M) between adjacent two rectifiers, and setting the frequency of the carrier of each of the rectifiers as a rated carrier frequency, wherein N and M are positive integers greater than or equal to 1; if there are N rectifiers normally operating and M rectifiers being shut down in the multiple rectifier and the operating power of the N rectifiers is equal to the first preset power, setting the phase-shifting angle of the carrier of the N rectifiers according to the phase information of the grid-side voltage signal and the interval of π / N between adjacent two rectifiers in the N rectifiers, setting the phase-shifting angle of the carrier of the M rectifiers according to the interval of π / M between adjacent two rectifiers in the M rectifiers, and setting the frequency of the carrier of the M+N rectifiers as the rated carrier frequency of the rectifiers.

3. The control method according to claim 2, characterized by, The setting of the frequency and the phase-shifting angle of the carrier of each of the rectifiers according to the phase information of the grid-side voltage signal and the operating power and state information of each of the rectifiers in the multiple rectifier further comprises: if there are N1+N2 rectifiers normally operating and M rectifiers being shut down in the multiple rectifier and the operating power of the N1 rectifiers is equal to the first preset power and the deviation rate of the operating power of the N2 rectifiers from the first preset power is less than a first preset deviation rate, performing the following steps: setting the phase-shifting angle of the carrier of the N1 rectifiers according to the phase information of the grid-side voltage signal and the interval of π / (N1+N2) between adjacent two rectifiers in the N1+N2 rectifiers, and obtaining an initial setting angle of the carrier of the N2 rectifiers; Extract the phase information of the modulation waves of N1 rectifiers and the phase information of the modulation waves of N2 rectifiers. Based on the phase information of the modulation waves of N1 rectifiers and the phase information of the modulation waves of N2 rectifiers... Based on the information and the initial set angle, set the phase shift angle of N2 carriers of the rectifier; Based on the phase information of the grid-side voltage signal, the phase shift angle of the carrier of the M rectifiers is set according to the interval of π / M angle between two adjacent rectifiers in the M rectifiers; The rated carrier frequency of the rectifier is used as the frequency of the carriers of N1+N2+M rectifiers, where N=N1+N2, and N1 and N2 are both positive integers greater than or equal to 1.

4. The control method according to claim 3, characterized by The step of setting the carrier frequency and phase shift angle of each rectifier based on the phase information of the grid-side voltage signal and the operating power and status information of each rectifier in the multiplexed rectifier further includes: If the multiplexed rectifier has N1+N2+N3 rectifiers operating normally and M rectifiers shut down, and the operating power of the N1 rectifiers is equal to the first preset power, the deviation rate of the operating power of the N2 rectifiers from the first preset power is less than the first preset deviation rate, and the deviation rate of the operating power of the N3 rectifiers from the first preset power is greater than or equal to the first preset deviation rate and less than the second preset deviation rate, then the following steps are performed: Based on the phase information of the grid-side voltage signal, according to the interval π / (N1+N2) between two adjacent rectifiers in the N1+N2 rectifiers, the phase shift angle of the carrier of the N1 rectifiers is set, and the initial setting angle of the carrier of the N2 rectifiers is obtained. Extract the phase information of the modulation waves of N1 rectifiers and the phase information of the modulation waves of N2 rectifiers. Based on the phase information of the modulation waves of N1 rectifiers, the phase information of the modulation waves of N2 rectifiers, and the initial set angle, set the phase shift angle of the carrier of N2 rectifiers. Based on the phase information of the grid-side voltage signal, the phase shift angle of the carrier of the N3 rectifiers is set according to the interval of π / N3 angle between two adjacent rectifiers; Based on the phase information of the grid-side voltage signal, the phase shift angle of the carrier of the M rectifiers is set according to the interval of π / M angle between two adjacent rectifiers in the M rectifiers; A first carrier frequency is obtained based on the rated carrier frequency of the rectifier, wherein the first carrier frequency is greater than the rated carrier frequency; The rated carrier frequency of the rectifier is used as the frequency of the carriers of N1+N2+M rectifiers, and the first carrier frequency is used as the frequency of the carriers of N3 rectifiers, where N=N1+N2+N3, and N1, N2, and N3 are all positive integers greater than or equal to 1.

5. The control method according to claim 4, characterized by The method further comprises: If there are N1+N2+N3+N4 normal operating rectifiers and M stopped rectifiers in the multi-rectifier, and the operating power of N1 rectifiers is equal to the first preset power, the deviation rate of the operating power of N2 rectifiers from the first preset power is less than the first preset deviation rate, the deviation rate of the operating power of N3 rectifiers from the first preset power is greater than or equal to the first preset deviation rate and less than the second preset deviation rate, and the deviation rate of the operating power of N4 rectifiers from the first preset power is greater than or equal to the second preset deviation rate, the following steps are performed: Based on the phase information of the grid-side voltage signal, the phase shift angles of the carriers of N1 rectifiers are set according to the interval of π / (N1+N2) between adjacent two of N1+N2 rectifiers, and the initial setting angles of the carriers of N2 rectifiers are obtained; The phase information of the modulation waves of N1 rectifiers and the phase information of the modulation waves of N2 rectifiers are extracted, and the phase shift angles of the carriers of N2 rectifiers are set according to the phase information of the modulation waves of N1 rectifiers, the phase information of the modulation waves of N2 rectifiers and the initial setting angles; Based on the phase information of the grid-side voltage signal, the phase shift angles of the carriers of N3 rectifiers are set according to the interval of π / N3 between adjacent two of N3 rectifiers; Based on the phase information of the grid-side voltage signal, the phase shift angles of the carriers of N4 rectifiers are set according to the interval of π / N4 between adjacent two of N4 rectifiers; Based on the phase information of the grid-side voltage signal, the phase shift angles of the carriers of M rectifiers are set according to the interval of π / M between adjacent two of M rectifiers; The first carrier frequency is obtained according to the rated carrier frequency of the rectifier, wherein the first carrier frequency is greater than the rated carrier frequency; The second carrier frequency is obtained according to the rated carrier frequency of the rectifier, wherein the second carrier frequency is greater than the first carrier frequency; The rated carrier frequency of the rectifier is taken as the frequency of the carriers of N1+N2+M rectifiers, the first carrier frequency is taken as the frequency of the carriers of N3 rectifiers, and the second carrier frequency is taken as the frequency of the carriers of N4 rectifiers, wherein N=N1+N2+N3+N4, N1, N2, N3 and N4 are positive integers greater than or equal to 1. The method further comprises:

6. The control method according to claim 1, characterized by, The grid-side voltage signal is obtained, and the phase information of the grid-side voltage signal is extracted through a phase-locked loop. ​ 7. A control device for a rectifier, characterized by The application is applied to a multiple rectifier comprising a transformer and multiple rectifiers, and the control device comprises: A first acquisition module is configured to acquire a grid-side voltage signal and extract phase information of the grid-side voltage signal; A second acquisition module is configured to acquire rectification current signals of the rectifiers; A first processing module is configured to obtain operating power and state information of each of the rectifiers in the multiple rectifier according to the grid-side voltage signal, the rectification current signals, and a transformation ratio of the transformer; A second processing module is configured to set frequencies and phase shift angles of carriers of the rectifiers according to the phase information of the grid-side voltage signal and the operating power and state information of each of the rectifiers in the multiple rectifier; A control module is configured to generate corresponding carriers and modulation waves to drive and control each of the rectifiers according to the frequencies and phase shift angles of the carriers of each of the rectifiers.

8. The control device of claim 7, wherein In the execution of the setting of the frequencies and phase shift angles of the carriers of each of the rectifiers according to the phase information of the grid-side voltage signal and the operating power and state information of each of the rectifiers in the multiple rectifier, the second processing module is specifically configured to: If there are N+M rectifiers normally operating in the multiple rectifier, and the operating power of the N+M rectifiers is equal to a first preset power, the phase shift angles of the carriers of each of the rectifiers are set according to an interval of π / (N+M) angles between adjacent two rectifiers based on the phase information of the grid-side voltage signal, and a rated carrier frequency is taken as the frequency of the carrier of each of the rectifiers, wherein N and M are positive integers greater than or equal to 1; If there are N rectifiers normally operating and M rectifiers shutting down in the multiple rectifier, and the operating power of the N rectifiers is equal to the first preset power, the phase shift angles of the carriers of the N rectifiers are set according to an interval of π / N angles between adjacent two rectifiers in the N rectifiers based on the phase information of the grid-side voltage signal, the phase shift angles of the carriers of the M rectifiers are set according to an interval of π / M angles between adjacent two rectifiers in the M rectifiers, and the rated carrier frequency of the rectifiers is taken as the frequency of the carriers of the M+N rectifiers.

9. The control device of claim 8, wherein, In the execution of the setting of the frequencies and phase shift angles of the carriers of each of the rectifiers according to the phase information of the grid-side voltage signal and the operating power and state information of each of the rectifiers in the multiple rectifier, the second processing module is further specifically configured to: If there are N1+N2 rectifiers normally operating and M rectifiers shutting down in the multiple rectifier, and the operating power of the N1 rectifiers is equal to the first preset power and the deviation rate of the operating power of the N2 rectifiers from the first preset power is less than a first preset deviation rate, the following steps are performed: According to the phase information of the grid-side voltage signal, the phase shift angle of the carrier of the N1 rectifiers is set according to the interval of π / (N1+N2) degrees between adjacent two of the N1+N2 rectifiers, and the initial setting angle of the carrier of the N2 rectifiers is obtained; The phase information of the modulation wave of the N1 rectifiers and the phase information of the modulation wave of the N2 rectifiers are extracted, and the phase shift angle of the carrier of the N2 rectifiers is set according to the phase information of the modulation wave of the N1 rectifiers, the phase information of the modulation wave of the N2 rectifiers and the initial setting angle; According to the phase information of the grid-side voltage signal, the phase shift angle of the carrier of the M rectifiers is set according to the interval of π / M degrees between adjacent two of the M rectifiers; The rated carrier frequency of the rectifier is taken as the frequency of the carrier of the N1+N2+M rectifiers, wherein N=N1+N2, N1 and N2 are positive integers greater than or equal to 1.

10. The control device of claim 9, wherein When the second processing module executes the setting of the frequency and the phase shift angle of the carrier of each rectifier according to the phase information of the grid-side voltage signal, the operating power and the state information of each rectifier in the multi-rectifier, it is further used for: If there are N1+N2+N3 rectifiers normally operating and M rectifiers shutting down in the multi-rectifier, the operating power of the N1 rectifiers is equal to the first preset power, the deviation rate of the operating power of the N2 rectifiers from the first preset power is less than the first preset deviation rate, the deviation rate of the operating power of the N3 rectifiers from the first preset power is greater than or equal to the first preset deviation rate and less than the second preset deviation rate, the following steps are executed: According to the phase information of the grid-side voltage signal, the phase shift angle of the carrier of the N1 rectifiers is set according to the interval of π / (N1+N2) degrees between adjacent two of the N1+N2 rectifiers, and the initial setting angle of the carrier of the N2 rectifiers is obtained; The phase information of the modulation wave of the N1 rectifiers and the phase information of the modulation wave of the N2 rectifiers are extracted, and the phase shift angle of the carrier of the N2 rectifiers is set according to the phase information of the modulation wave of the N1 rectifiers, the phase information of the modulation wave of the N2 rectifiers and the initial setting angle; According to the phase information of the grid-side voltage signal, the phase shift angle of the carrier of the N3 rectifiers is set according to the interval of π / N3 degrees between adjacent two of the N3 rectifiers; According to the phase information of the grid-side voltage signal, the phase shift angle of the carrier of the M rectifiers is set according to the interval of π / M degrees between adjacent two of the M rectifiers; According to the rated carrier frequency of the rectifier, a first carrier frequency is obtained, wherein the first carrier frequency is greater than the rated carrier frequency; ​ The rated carrier frequency of the rectifier is the frequency of the carriers of N1+N2+M rectifiers, and the first carrier frequency is the frequency of the carriers of N3 rectifiers, wherein N=N1+N2+N3, N1, N2, and N3 are positive integers greater than or equal to 1.

11. The control device of claim 10, wherein The second processing module is further configured to: If there are N1+N2+N3+N4 rectifiers in normal operation and M rectifiers in shutdown in the multi-rectifier, and the operating power of N1 rectifiers is equal to the first preset power, the deviation rate of the operating power of N2 rectifiers from the first preset power is less than the first preset deviation rate, the deviation rate of the operating power of N3 rectifiers from the first preset power is greater than or equal to the first preset deviation rate and less than the second preset deviation rate, and the deviation rate of the operating power of N4 rectifiers from the first preset power is greater than or equal to the second preset deviation rate, the following steps are performed: Based on the phase information of the grid-side voltage signal, the phase shift angles of the carriers of N1 rectifiers are set at intervals of π / (N1+N2) between adjacent two rectifiers in N1+N2 rectifiers, and initial setting angles of the carriers of N2 rectifiers are obtained; The phase information of the modulation waves of N1 rectifiers and the phase information of the modulation waves of N2 rectifiers are extracted, and the phase shift angles of the carriers of N2 rectifiers are set according to the phase information of the modulation waves of N1 rectifiers, the phase information of the modulation waves of N2 rectifiers, and the initial setting angles; Based on the phase information of the grid-side voltage signal, the phase shift angles of the carriers of N3 rectifiers are set at intervals of π / N3 between adjacent two rectifiers in N3 rectifiers; Based on the phase information of the grid-side voltage signal, the phase shift angles of the carriers of N4 rectifiers are set at intervals of π / N4 between adjacent two rectifiers in N4 rectifiers; Based on the phase information of the grid-side voltage signal, the phase shift angles of the carriers of M rectifiers are set at intervals of π / M between adjacent two rectifiers in M rectifiers; The first carrier frequency is obtained according to the rated carrier frequency of the rectifier, wherein the first carrier frequency is greater than the rated carrier frequency; The second carrier frequency is obtained according to the rated carrier frequency of the rectifier, wherein the second carrier frequency is greater than the first carrier frequency; ​ The rated carrier frequency of the rectifier is the frequency of N1+N2+M carriers of the rectifier, the first carrier frequency is the frequency of N3 carriers of the rectifier, and the second carrier frequency is the frequency of N4 carriers of the rectifier, wherein N=N1+N2+N3+N4, N1, N2, N3, and N4 are positive integers greater than or equal to 1.

12. The control device of claim 7, wherein The first acquisition module is configured to: acquire a grid-side voltage signal and extract phase information of the grid-side voltage signal through a phase-locked loop.

13. A control system for a rectifier, characterized by The control device, the voltage acquisition device, and the plurality of current acquisition devices are included. The voltage acquisition device is configured to acquire a high-voltage analog grid-side voltage signal, perform voltage reduction and analog-to-digital conversion processing on the high-voltage analog grid-side voltage signal, obtain a low-voltage digital grid-side voltage signal, and output the low-voltage digital grid-side voltage signal. Each current acquisition device is configured to acquire an analog rectifier current signal of each rectifier, perform analog-to-digital conversion processing on the acquired analog rectifier current signal, obtain a digital rectifier current signal, and output the digital rectifier current signal.

14. The control system of claim 13, wherein, The voltage acquisition device includes a voltage sensor, a voltage dividing circuit, and a first analog-to-digital converter, and the current acquisition device includes a current sensor and a second analog-to-digital converter. A first end of the voltage sensor is connected to a power grid. A second end of the voltage sensor is connected to a first end of the voltage dividing circuit. A second end of the voltage dividing circuit is connected to a first end of the first analog-to-digital converter. A second end of the first analog-to-digital converter is connected to the control device. A first end of each current sensor is connected to each rectifier in a one-to-one correspondence. A second end of each current sensor is connected to a first end of the second analog-to-digital converter. A second end of the second analog-to-digital converter is connected to the control device.

15. A control device of a rectifier characterized by comprising: The control system and the multi-rectifier are included. A first end and a second end of a primary side of the transformer are connected to a power grid. A first end of a secondary side of the transformer is connected to a first end of the first resistor. A second end of the first resistor is connected to a first end of the first inductor. A second end of the first inductor is connected to a first end of the full-bridge rectifier circuit. A second end of the full-bridge rectifier circuit is connected to a first end of the second inductor and a first end of the first capacitor. A second end of the second inductor is connected to a first end of the second capacitor. A second end of the first capacitor and a second end of the second capacitor are connected to a third end of the full-bridge rectifier circuit. A fourth end of the full-bridge rectifier circuit is connected to a second end of the secondary side of the transformer. The rectifier further includes a second resistor, a third inductor, and a third capacitor.

16. The control device according to claim 15, characterized by A third end of the secondary side of the transformer is connected to a first end of the second resistor. A second end of the second resistor is connected to a first end of the third inductor. A second end of the third inductor is connected to a first end of the third capacitor. A second end of the third inductor is connected with a first end of the third capacitor; A second end of the third capacitor is connected with a fourth end of the secondary side of the transformer.

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