Research on the Stability of Biaxial Excitation of Synchronous Generators

Abstract

The biaxially excited synchronous generator overcomes the shortcomings of conventional synchronous generators in fault regulation and is able to regulate the output power of reactive power while transmitting active power, with deep phase in, significantly improving power system stability. In this paper, a vector model of the biaxially excited synchronous generator on the dq0 coordinate system is constructed, the power angle characteristics and basic equations are derived, and the dual-channel excitation method and the active and reactive power regulation process of the biaxially excited synchronous generator are further elaborated. By building a simulation model in Flux simulation software, the effects of the magnitude, action time and input moment of the generator's q-axis excitation current on the power angle and motor stability when a short-circuit fault occurs in the line are investigated in depth. The results indicate the conclusion that the motor with the q-axis excitation current incorporated is more helpful for power system stability than the conventional single-axis motor.