Abstract
Multi-phase electric machines such as five-phase permanent magnet synchronous motor (PMSM) play an important role in the ships electrical propulsion because of the advantages of high performance and high reliability. The decoupled mathematic models of five-phase PMSM in dq coordinate frame are established, and the reason caused to high stator harmonic current in the multi-phase motor is analyzed based on the mathematic models. To suppress the harmonic current, a novel vector control (VC) method based on SVPWM and harmonic current closed loop control is proposed. Based on the proposed algorithm, a five-phase PMSM vector control system is established with MATLAB, the performance is simulated and analyzed. The results show that, the stator harmonic current is much little than that of the traditional control method.
Highlights
Variable speed control of multi-phase motor is an important technology in high performance and high power electrical drive field, which has been widely applied to the ships electrical propulsion
Some studies find that the current harmonics of the multi-phase motor are significantly larger than the three-phase motor in the traditional control mode [3]
Five-phase permanent magnet synchronous motor (PMSM) is taking as an example to analyse the causes of excessive harmonic currents generated by the multi-phase motors based on the detailed modelling of the motor, and a multi - phase motor vector control method based on SVPWM and harmonic current closed-loop is proposed
Summary
Variable speed control of multi-phase motor is an important technology in high performance and high power electrical drive field, which has been widely applied to the ships electrical propulsion. Some literatures try to apply the traditional three-phase motor control methods to multi-phase systems directly, such as the twelve-pulse scalar control of six-phase motors [1], the vector control of multi-phase Permanent Magnet Synchronous Motor (PMSM) based on current hysteresis PWM [2], and so on. Five-phase permanent magnet synchronous motor (PMSM) is taking as an example to analyse the causes of excessive harmonic currents generated by the multi-phase motors based on the detailed modelling of the motor, and a multi - phase motor vector control method based on SVPWM and harmonic current closed-loop is proposed. The harmonic current are suppressed effectively, and the motor control performance is enhanced at the same time
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