双三相PMSM锯齿载波双随机SVPWM策略

Sawtooth Carrier Double Random SVPWM Strategy for Dual Three-phase PMSM

双三相永磁同步电机具有高功率密度、低成本、高可靠性等优点,适用于电动飞机、舰船推进等场合。然而,采用空间矢量脉宽调制策略(space vector pulse width modulation,SVPWM)会导致相电流在开关频率及其整数倍处存在集中的高频谐波,并因此带来振动噪声问题。此外,对双三相电机开关序列的中心化处理,也会增加谐波含量。为此,文中结合随机零矢量SVPWM与变延时SVPWM,提出基于锯齿载波的双随机SVPWM控制方法。在不影响矢量控制运行性能的情况下,将开关频率及其整数倍处的谐波分散到指定频域内,显著降低相电流的高频谐波幅值。与此同时,采用锯齿载波代替传统的三角载波,避免了开关序列的中心化处理,降低了谐波含量。实验结果验证了所提控制方法的有效性。

Dual three-phase permanent magnet synchronous motors offer high power density, low cost and high reliability, which are suitable for electric aircraft, ship propulsion and so on. However, space vector pulse width modulation(SVPWM) causes concentrated high-frequency harmonics of the phase current at the switching frequency and its integral multiples, which brings vibration and noise problems. In addition, the centralization of switching sequence of the dual three-phase motor also increases the harmonic content. In this paper, combined with random zero vector SVPWM and variable time delayed SVPWM, a double random SVPWM using sawtooth carrier control method was proposed.The harmonics at the switching frequency and its integral multiples were dispersed into the specified frequency domain with good operation performance of vector control, and the high-frequency harmonic amplitude of phase current was reduced significantly. Meanwhile, the centralization of switch sequence was avoided and the harmonic content was reduced by using the sawtooth carrier replace the traditional triangle carrier. The experimental results verified the proposed control method.