2D Repetitive PI Control for Enhanced Harmonic Current Suppression in Induction Machines

This paper presents a novel control strategy, for mitigating harmonics in squirrel cage induction machines using a repetitive PI-controller. The proposed method enhances existing control architectures for permanent-magnet synchronous motors by taking the rotor harmonics into account by adding a second dimension. This is a key enabler for harmonic current mitigation in induction machines, as the magnetic circuit depends on the rotor position and rotor flux angle. The presented controller has been verified by test bench measurements. In addition, its performance is demonstrated by comparison with a conventional PI control and a 1D repetitive PI control using measurements.