一种采用陷波滤波器的超前角弱磁控制算法

Notch filter leading angle flux weakening control algorithm

针对永磁同步电主轴在弱磁阶段,当采用SVPWM过调制控制时稳态速度产生波动的现象,在分析超前角弱磁控制算法的基础上,将主要原因归结为SVPWM过调制引起逆变器输出电压的6次谐波分量通过弱磁电压闭环传导到dq轴参考电流中,造成电流环控制性能变差进而影响电主轴的速度控制性能。对此,提出一种采用陷波滤波器的超前角弱磁控制算法。此方法在弱磁电压闭环回路中设计了陷波滤波器,以滤除输入电压信号中的6次谐波分量,同时不影响其他信号分量。实验结果表明,加入陷波滤波器之后,弱磁阶段的输出电压、电流与速度信号中的6次谐波分量明显地减小,其波形得到了显著改善,从而有效地提高了电主轴的弱磁调速性能。

As permanent magnet synchronous spindle （ PMSS ） runs in the flux weakening region, the SVPWM over modulation control will cause the fluctuation of steady-state speed. By analyzing the princi-ple of the leading angle flux weakening control algorithm, the main reason is that the SVPWM over modu-lation causes the sixth harmonic of inverter output voltage and it transmits to the dq reference currents though the flux weakening voltage close-loop, as a result the current and speed control performance of PMSS is deteriorated. In order to solve this problem, a notch filter leading angle flux weakening control algorithm was proposed. A notch filter was designed to filter the sixth harmonic component of the input voltage signal in the voltage close-loop, and the other signal components were not affected. The experi-ment results show that the notch filter can significantly reduce the sixth harmonic component of the input voltage, current and speed signal in the flux weakening region, and their waveforms are remarkably im-proved. The flux weakening speed control performance is effectively enhanced.