CN-121984306-A - Multiphase generator power control and decoupling control method and system

CN121984306ACN 121984306 ACN121984306 ACN 121984306ACN-121984306-A

Abstract

The application discloses a power control and decoupling control method and system for a multiphase generator, and belongs to the technical field of direct current power generation. The method comprises the steps of sampling output current of a multiphase generator, converting the output current into d-q axis current components under a rotating coordinate system through coordinate transformation, constructing a double closed-loop control relation of a power outer loop and a current inner loop based on the converted d-q axis current components, wherein the output of the power outer loop serves as a q-axis current reference value, the d-axis current reference value is given according to a field weakening curve or a field weakening control strategy, introducing a feedforward decoupling calculation link to compensate multiphase winding mutual inductance coupling, realizing current decoupling control, carrying out pulse width modulation on control output, generating multiphase rectifier control signals, and outputting the multiphase rectifier control signals to a multiphase rectifier. The application has the characteristics of high efficiency and high power density, can be easily improved to realize the four-quadrant operation of the motor, analyzes and designs decoupling links aiming at the mutual inductance coupling of the multiphase motor, and can realize the high-performance power generation rectification control.

Inventors

CHU WENTING
WANG YUE
Zou Fanshu
HUI YANNIAN
HE WEIDONG
XU LIE
HAN YANJIE

Assignees

中国商用飞机有限责任公司北京民用飞机技术研究中心
中国商用飞机有限责任公司

Dates

Publication Date: 20260505
Application Date: 20251223

Claims (10)

1. A multiphase generator power control and decoupling control method, comprising: s1, sampling output current of a multiphase generator, and converting the output current into d-q axis current components under a rotating coordinate system through coordinate transformation; S2, based on the converted d-q axis current component, constructing a double closed-loop control relation of a power outer loop and a current inner loop, wherein the output of the power outer loop is used as a q axis current reference value, and the d axis current reference value is given according to a field weakening curve or a field weakening control strategy; s3, compensating the mutual inductance coupling of the multiphase winding by introducing a feedforward decoupling calculation link to realize current decoupling control; and S4, performing pulse width modulation on the control output to generate a multiphase rectifier control signal, and outputting the multiphase rectifier control signal to a multiphase rectifier.
2. The multiphase generator power control and decoupling control method of claim 1, wherein S1 specifically comprises: s11, sampling multiphase stator currents output by the multiphase generator in real time to obtain current components of each phase; s12, taking the sampled multiphase current components as a coupling form of N/3 three-phase units, respectively applying Clarke transformation matrix to each three-phase unit, and converting the current components under a multiphase stationary coordinate system into components under a two-phase stationary coordinate system; And S13, applying a Park transformation matrix to the converted two-phase stationary coordinate system components, and further converting the Park transformation matrix into d-q axis components under a rotating coordinate system, wherein the Park transformation matrix comprises an i-th set of unit winding A phase angle for projection to a respective corresponding fundamental wave d-q plane.
3. The multiphase generator power control and decoupling control method of claim 2, wherein in S12, the Clarke transformation employs an equal magnitude transformation or an equal power transformation, wherein: When the constant amplitude transformation is adopted, the amplitude coefficient of the Clarke transformation matrix is ; When the equal power conversion is adopted, the amplitude coefficient of the Clarke conversion matrix is 。
4. The multiphase generator power control and decoupling control method of claim 2, wherein in S13, the rotational angle of the Park transformation matrix The real-time electric angle of the phase A of the ith set of unit windings in the rotating process is set, and n is the number of windings; wherein, after the Park transformation matrix is applied, the current components of each set of unit windings are decoupled to the corresponding unit windings Shaft current component An axis current component.
5. The multiphase generator power control and decoupling control method of claim 1, wherein S2 specifically comprises: s21, analyzing a converted d-q axis current component, wherein the q axis current component is related to torque, and the d axis current component is related to flux linkage; s22, sampling the DC bus voltage and inputting the DC bus voltage and a preset DC voltage set value into a PI controller to generate a power outer loop output as a q-axis current reference value; s23, setting a d-axis current reference value along a weak current curve according to the working condition of the multiphase generator; S24, inputting the q-axis current reference value, the d-axis current reference value and the actually converted d-q-axis current component into a current inner loop PI controller, and constructing a double closed loop control relation of a power outer loop and a current inner loop.
6. The method for power control and decoupling control of a multiphase generator according to claim 5, wherein in S23, if the multiphase generator is operating in a field weakening region, a voltage value corresponding to a maximum voltage utilization rate is defined by a field weakening control strategy, and the defined result is used as a d-axis current reference value.
7. The multiphase generator power control and decoupling control method of claim 1, wherein S3 specifically comprises: s31, expanding a stator voltage equation of the multiphase motor, and extracting a mutual inductance voltage component, wherein the stator voltage equation comprises a mutual inductance coupling term; s32, designing a feedforward decoupling calculation link after the current inner loop PI control loop, and performing compensation calculation on the mutual inductance coupling item to generate a decoupling calculation variable; and S33, compensating current coupling among the multiphase windings according to the generated decoupling calculation variable to realize mutual decoupling of multiphase voltage components.
8. The method for power control and decoupling control of a multiphase generator of claim 7, wherein said expanding multiphase motor stator voltage equation extracting a mutual inductance voltage component in S31 comprises: The stator voltage equation is expressed in a multiphase form comprising voltage, resistance, current, self-induced current derivatives and mutual inductance current derivative terms, wherein the mutual inductance coupling terms represent inter-winding coupling.
9. The multiphase generator power control and decoupling control method of claim 1, wherein S4 specifically comprises: S41, acquiring PI controller output from the double closed-loop control relation of the power outer loop and the current inner loop, and combining a compensation result of a feedforward decoupling calculation link to form a modulation input signal; S42, processing the modulated input signal by using pulse width modulation to generate a control signal required by the multiphase rectifier, wherein the pulse width modulation considers the structures of N half-bridge systems; and S43, outputting the generated control signal to a multiphase rectifier to realize stable control of the output power of the multiphase generator.
10. A multiphase generator power control and decoupling control system, characterized in that the system operates based on a method according to any of claims 1 to 9, the system comprising: The current sampling module is used for sampling the output current of the multiphase generator and converting the output current into a d-q axis current component under a rotating coordinate system through coordinate transformation; the double closed-loop control module is used for constructing a double closed-loop control relation between a power outer loop and a current inner loop based on the converted d-q axis current component, wherein the output of the power outer loop is used as a q axis current reference value, and the d axis current reference value is given according to a weak magnetic curve or a weak magnetic control strategy; The feedforward compensation module is used for introducing feedforward decoupling calculation links to compensate the mutual inductance coupling of the multiphase windings so as to realize current decoupling control; and the control signal output module is used for carrying out pulse width modulation on the control output, generating a multiphase rectifier control signal and outputting the multiphase rectifier control signal to the multiphase rectifier.

Description

Multiphase generator power control and decoupling control method and system Technical Field The application belongs to the technical field of direct current power generation, and particularly relates to a power control and decoupling control method and system of a multiphase generator. Background Compared with a three-phase motor, the multi-phase motor has the advantages of larger capacity, higher reliability, stronger control flexibility and the like, and can realize high-voltage and high-current electric energy conversion without multiple power tube series-parallel connection. The multiphase generator and the rectifier jointly form a direct current power generation system, and due to the high-speed operation of the multiphase generator and the change of a direct current bus load, the output direct current voltage of the rectifier of the multiphase generator can fluctuate, and a rectifier control strategy is required to make control adjustment according to the voltage and the current fed back in real time so as to keep the direct current bus voltage stable. The research on the rectification system of the multiphase generator and the research and investigation on the prior literature include the technical proposal that the diode rectifier bridge circuit is used for carrying out uncontrolled rectification on the alternating current signal output by the multiphase generator, and then the alternating current signal is subjected to DC/DC conversion to realize boosting output to a direct current bus, thereby completing the control of the direct current power generation system. Patent investigation on a multiphase generator rectifying system is disclosed in [1] Kang Lili, jiang Dongjie, sunzhen open, and the like, the multiphase permanent magnet generator rectifying system [ P ] Hebei: CN107317488A,2017-11-03, and an N-phase permanent magnet generator and N/3 rectifier structure of the multiphase permanent magnet generator rectifying system are disclosed, wherein N is larger than 3 and N is an integer multiple of 3. However, the existing scheme has low efficiency and low power density, cannot realize accurate regulation and control of the output power of the multiphase rectifier, and cannot ensure the operation stability under complex working conditions. Disclosure of Invention The application provides a multiphase generator power control and decoupling control method and system, which adopt a multiphase PWM rectification controller formed by N half-bridge systems, and compared with a scheme of uncontrolled rectification and DC/DC converter, the multiphase generator power control and decoupling control method and system have the characteristics of high efficiency and high power density. According to a first aspect of the present invention, there is provided a multiphase generator power control and decoupling control method, including: s1, sampling output current of a multiphase generator, and converting the output current into d-q axis current components under a rotating coordinate system through coordinate transformation; S2, based on the converted d-q axis current component, constructing a double closed-loop control relation of a power outer loop and a current inner loop, wherein the output of the power outer loop is used as a q axis current reference value, and the d axis current reference value is given according to a field weakening curve or a field weakening control strategy; s3, compensating the mutual inductance coupling of the multiphase winding by introducing a feedforward decoupling calculation link to realize current decoupling control; And S4, performing pulse width modulation (Pulse width modulation, PWM) on the control output to generate a multiphase rectifier control signal and outputting the multiphase rectifier control signal to the multiphase rectifier. Further, the S1 specifically includes: s11, sampling multiphase stator currents output by the multiphase generator in real time to obtain current components of each phase; s12, taking the sampled multiphase current components as a coupling form of N/3 three-phase units, respectively applying Clarke transformation matrix to each three-phase unit, and converting the current components under a multiphase stationary coordinate system into components under a two-phase stationary coordinate system; And S13, applying a Park transformation matrix to the converted two-phase stationary coordinate system components, and further converting the Park transformation matrix into d-q axis components under a rotating coordinate system, wherein the Park transformation matrix comprises an i-th set of unit winding A phase angle for projection to a respective corresponding fundamental wave d-q plane. Further, in S12, the sampled multiphase current components are regarded as coupling forms of N/3 three-phase units, specifically: The number of phases of the N-phase generator is determined, wherein N is greater than 3 and is an integer multiple of 3, and the N is decomp