A Novel Excitation Control Equipment Design of Synchronous Motor

This paper studied a novel excitation control device of a synchronous motor. a novel excitation control device was design directly using three-phase rectifier through high power switching power supply. It is of servo power characteristics that can changes itself output with the synchronous motor slip detected by high-speed programmable logic controller and the synchronous motor load, to eliminate the synchronous motor desynchronizing and an electromagnetic pulsating have been troubled and so on. Three-phase bridge rectifier by power diode rectifier filter was adopted to provide direct-current which it is f to four IGBT for a single-phase full-bridge output circuit. according to the load sensing characteristics and a "servo-driven" approach, IGBT drive signal with PWM duty cycle was controlled and regulated, to achieve synchronous motor excitation power supply. The novel excitation control device could detect accurately synchronous motor desynchronizing signal to achieve fast deexcitation and accurate re-closing, which not only to eliminate effectively power fluctuations caused by motor, but also to increase greatly the energy saving effect of excitation system.