Modulation function based SVPWM control method for single-phase open-circuit fault of five-phase permanent magnet synchronous motor

Abstract

The invention discloses a modulation function based SVPWM control method for a single-phase open-circuit fault of a five-phase permanent magnet synchronous motor, and the method is applied to fault-tolerant control over single-phase open-circuit fault of the five-phase permanent magnet synchronous motor, improves the utilization rate of DC voltage and reduces the operation time. The fault-tolerantcontrol system generates a two-phase static coordinate system modulation voltage instruction and a third harmonic space modulation voltage instruction, and carries out preprocessing to obtain a groupof modulation functions with coefficients as constants. During real-time operation, six sectors are determined, modulation functions of the corresponding sectors are directly called, the modulation functions are directly loaded into a comparison value register of each phase of driving pulse, and the comparison value register is compared with a time base counting register to obtain each phase of SVPWM pulse. By simplifying basic space voltage vector action sequence selection, action time calculation and switching action moment conversion processes, an SVPWM modulation calculation program is simplified, SVPWM modulation link operation time and overall control time are reduced, the control frequency under the same controller is improved, and thus more excellent control performance is obtained.

Description

technical field [0001] The invention belongs to the field of electrical engineering and relates to a modulation function-based SVPWM control method for single-phase open-circuit faults of five-phase permanent magnet synchronous motors. Background technique [0002] The five-phase permanent magnet synchronous motor has the characteristics of high power density, small torque fluctuation, wide speed range, and strong overload capacity. It can realize fault-tolerant operation through open-circuit fault fault-tolerant control in the case of phase loss, and has high reliability. The five-phase voltage source inverter space voltage vector pulse width modulation (SVPWM) algorithm is widely used in the five-phase permanent magnet synchronous motor control system due to its clear physical meaning, high voltage utilization rate and simple implementation. However, the traditional SVPWM algorithm exists The shortcomings of large amount of calculation, complex operation and poor real-time...

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Problems solved by technology

[0004] In order to solve the problems of large amount of calculation and complex operation in the traditional fault-tolerant control method, the present invention proposes a SVPWM control method for single-phase open-circuit fault of five-phase permanent magnet synchronous motor based on modulation function, by simplifying the basic space voltage vector action sequence The process of selection, action time calculation and switch action time conversion realizes the simplification of the calculation program of the SVPWM modulation method and reduces the calculation time of the SVPWM; the realization process is: the modulation voltage command and the third harmonic space modulation voltage command in the two-phase stationary coordinate system. Preprocessing to obtain a set of modulation functions with constant coefficients. In real-time operation, after judging the sector, directly call the corresponding modulation function to configure the comparison value register, and directly load the modulation function of each sector into the comparison value as the comparison value. The value register is compared with the time base counting register to obtain the upper bridge arm switching pulse of each phase, the lower bridge arm pulse is complementary to the upper bridge arm pulse, and the upper and lower bridge arm pulses of each phase are added to the dead zone signal respectively to control the power switch tube Pulse signal, so as to complete the duty cycle control of PWM pulse, and realize the SVPWM control of five-phase permanent magnet synchronous motor single-phase open-circuit fault

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