Five-phase inverter non-sinusoidal random SVPWM modulation method

Abstract

The invention discloses a five-phase inverter non-sinusoidal random SVPWM modulation method, and belongs to the technical field of multi-phase motor drive control. According to the method, two big vectors and two middle vectors which surround sectors which a fundamental wave reference voltage vector belongs to are selected to compound the fundamental wave reference voltage vector; a third harmonic reference voltage vector is compounded on a voltage vector corresponding to a third harmonic space through the chosen two big vectors and two middle vectors; when vector action time is calculated, in every sampling cycle, the sampling cycle is kept constant, a PWM pulse is delayed randomly, two zero action times are randomly allocated, and double-random of switch frequency and zero vector action time is achieved. According to the five-phase inverter non-sinusoidal random SVPWM modulation method, when a motor is driven, the torque amount of a fundamental wave current and a third harmonic current are linearly overlaid, thus the torque density of a system is increased, on the condition of not influencing low frequency-band harmonic performance, the amplitude of higher harmonic is drastically lowered, electromagnetic interference and high frequency noise are inhibited, and the electromagnetic compatibility of the system is improved.

Description

technical field [0001] The invention discloses a non-sinusoidal random SVPWM modulation method for a five-phase inverter, in particular to a five-phase inverter SVPWM method capable of simultaneously controlling fundamental wave and third harmonic output and double random switching frequency and zero vector action time , belongs to the technical field of multi-phase motor drive control. Background technique [0002] With the development of modern power electronics technology, microelectronics technology and control theory, the motor system driven by the inverter has got rid of the limitation of the three-phase power grid. A series of problems, multiphase motor systems have gradually received more and more attention. Compared with the three-phase motor system, the multi-phase motor system has the advantages of strong fault tolerance, high reliability, and small torque ripple. It is suitable for aerospace, ship propulsion, and electric vehicles with high power, high reliabili...

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Problems solved by technology

At present, the research on random modulation technology is limited to three-phase systems and their subsystems, and has not been applied to multi-phase systems composed of non-three-phase subsystems, and the non-sinusoidal SVPWM method for multi-phase inverters has not considered high The improvement of frequency performance, the inherent problems of traditional PWM-electromagnetic interference and the concentrated distribution of harmonic energy still exist

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