A novel control strategy for static excitation system based on three-phase current source converter

摘要

In modern power system, increasing pressures of system stability have become more and more serious. Because ex citation systems are one of the most effective and economical ways contribute to effective control of voltage, increasing attention has been focused on the effects of excitation control. To satisfy the needs of modern power system, excitation system based on full-controlled devices is proposed to be used in synchronous generator excitation, and a new decoupled control technique is adopted to design a controller for current source converter based ex citation system in this paper. Then, the modified Heffron-Phllips mathematical model of synchronous generator based on this new type of excitation system is discussed, which helps to explicate the principle of reactive power injector in the new excitation system and its design strategy. Also, the crucial function of reactive power injector that could provide more damping to the system is explained. The simulation results are presented to demonstrate the correctness and effectiveness of the proposed approaches, and its advantage over the conventional excitation system.