Harmonic Current Controller Design for Anisotropic Synchronous Machines based on a Machine Model in Harmonic Reference Frame

This paper proposes a novel controller design for harmonic current control of synchronous machines based on a plant model in a harmonic reference frame. The modeling in the harmonic reference frame exposes additional harmonic couplings in the plant's transfer function, caused by the different inductances in the direct- and quadrature-axis of the rotor. These effects disturb conventional harmonic controllers. Therefore, the proposed controller uses an inverse plant model including the additional harmonic couplings, to achieve the desired stationary and dynamic behavior. The implementation of the novel harmonic controller, simulations and experimental results are presented for a permanent magnet assisted synchronous reluctance machine.