基于改进型谐振控制扰动观测器的永磁同步电机驱动解耦死区补偿方法

This article presents a decoupled dead-time compensation method for voltage source inverters in permanent magnet synchronous machine (PMSM) drives. In the proportional-integral-resonant (PIR) based compensation scheme, the performances of the current control loop and dead-time compensation are coupled. Hence, effective compensation of the dead-time effect is yield with the expense of distorted current step response, where significant overshoot and oscillation are introduced. Besides, the extended-state observer (ESO) based scheme suffers from poor compensation capability due to limited tracking bandwidth. To increase the tracking bandwidth, the quasi-resonant-controller (QRC) based disturbance observer was proposed. However, such observer suffers from the problem of system instability. To address above issues, a revised-resonant control-based disturbance observer is proposed in this article, which could fully decouple the performances of the current control loop and dead-time compensation. Compared with the PIR, the proposed scheme could donate superior compensation capability without introducing overshoot and oscillation in the current step response. Compared with the ESO, the proposed scheme could increase tracking bandwidth and thus donate superior compensation capability. Compared with the QRC-based observer, the proposed scheme could guarantee system stability. Detailed analysis of system stability and compensation capability is presented. Finally, the proposed scheme is experimentally validated on a 0.55 kW PMSM platform.