Complex Vector Harmonic Current Controller Based on Multiple Synchronous Reference Frame for Harmonic Reduction Considering Saliency and Flux Saturation of IPMSMs

In this paper, a harmonic current controller based on the multiple synchronous reference frame (MSRF) is proposed to achieve stable harmonic current control in an interior permanent magnet synchronous motor (IPMSMs) at dynamic response. The structure of the controller consists of complex vector PI controllers that control the current of each frequency component connected in parallel. To ensure a stable dynamic response, controller is designed to achieve pole-zero cancellation between the plant and the resonant controller. In this process, the controller structure and gains are determined by considering the saliency and flux saturation of the plant. To consider saliency, the controller gains are applied before performing the rotational transformation into each harmonic reference frame. Additionally, considering flux saturation, the controller gains are designed with dynamic inductance and apparent inductance. The proposed controller can be applied with the same structure even to motors without saliency like SPMSMs. Experiments were conducted on a 17 kW IPMSM including 6th harmonic components, and the improvement in controller performance was verified through dynamic current response analysis.