Improved Sensorless Control Strategy of High- Power Synchronous Motor for Pumped Storage Power Station

The high-power synchronous motor is widely used in pumped storage power station. An improved sensorless control strategy of synchronous motor is proposed in this paper, which can improve its operating reliability. First, the mathematical model of synchronous motor is built, and the low speed rotor position detection method is given. The detailed theoretical analysis and mathematical derivation are provided. Then, the back electromotive force phase detection for high-power synchronous motor at high speed is proposed. The influence of on-load operation on back electromotive force phase detection is given. Further, an improved constant leading commutation angle control method is expounded. At last, the simulation result verifies the proposed sensorless control strategy is feasibility.