An Anti-Overvoltage Strategy for Electrolytic Capacitorless IPMSM Drives Using Power Controller

Three-phase input diode rectifier interior permanent magnet synchronous motor (IPMSM) drives with small-volume film capacitors have many merits, such as high reliability, low cost and high power density. However, in regenerative braking, the DC-link voltage becomes harder to be controlled than the traditional topology due to the application of slim film capacitors. In this paper, an anti-overvoltage strategy is proposed by controlling the electrical power of the motor directly. The q-axis current boundary is determined by the proposed power controller. Compared with the conventional method of voltage controller, the proposed method is more suitable for electrolytic capacitorless drives.