A Proposal of Sinusoidal Voltage Source Fed Optimal Current Control for SPMSM with Active LC Filter by IRM-ILQ Control

Generally, the output voltage of a PWM inverter that drives SPMSM (Surface Permanent Magnet Synchronous Motor) has many harmonic components caused by switching. Harmonic components cause EMI (Electro Magnetic Interference), noise and leakage current problems. LPF (Low Pass Filter) including LC filter is effective to suppresses harmonics. LC filters have the potential for resonance phenomena. In addition, because of the presence of two dynamics, multivariable control based on modern control theory is required. Stable control is possible for SPMSM with Active LC filter, using ILQ (Inverse Linear Quadratic) control, which can realize robust multivariable control, and the IRM (Inverse Reference Model), which is two-degree-of-freedom control system. In this paper, Simulations confirm the effectiveness and robustness of the active LC filter. Controlling the SPMSM with active LC filter by this control method can suppress harmonics and contribute to the improvement of EMI problems and noise.