Inverter-Current Feedback-Only Control Method for LCL-Equipped HSPMSM Drives With Capacitively Coupled Active Damper

This article proposes an inverter-current feedback-only control method for LCL-equipped high-speed permanent magnet synchronous motor (HSPMSM) drives with a capacitively coupled active damper. The proposed method only needs to sample the inverter current, which can meet the requirements of inverter-current feedback-only in existing industrial applications. The proposed control method is developed based on the dual-source model of LCL-equipped HSPMSM drives. A coefficient selection method with strong parameter robustness is developed to design the controller. Thanks to the proposed method, the voltage stress of the damper is much lower than that of the main inverter, which helps to reduce the switching loss of the damper. This makes it possible to use low-voltage MOSFETs to build the damper instead of expensive SiC-MOSFETs. The experimental results of a 3 kW–12 k $\cdot $ r/min (1000 Hz) test motor verify the proposed method.