Analysis of Asynchronous Excitation Synchronous Generator for Distributed Generation

This paper proposes a structure of asynchronous excitation synchronous generator based on a three-stage synchronous generator. The motor structure utilizes the slip rate of the asynchronous generator, which can reduce the rotor frequency to a lower frequency without the need for a rotating rectifier, thereby reducing rotor losses and simplifying the motor structure. When the loop is open, the motor model is simplified, and three-phase symmetrical alternating current is used to supply power to the stator winding of the exciter to obtain the output of the main generator. When in a closed loop, a double closed-loop structure is required to control the phase of the DC side voltage to be ahead of the stator phase voltage of the exciter, so as to achieve energy transfer. This paper analyzes the motor structure, operating principle and energy transfer process of the asynchronous excitation synchronous generator. And an open-loop model of the motor was established in Maxwell software for simulation, verifying the feasibility of this method.