Investigating the influence of types and parameters of excitation systems on the dynamic reactive power reserve of synchronous generators

It is of great interest to fully utilize the dynamic reactive power reserve of synchronous generator, which is generally high in capacity and cheap in cost, to meet the demand of reactive power during the serious faults. The Guangdong power grid is used as the target system to evaluate the influence of the types and parameters of excitation controllers on the dynamic reactive power reserve of a generator. Two typical excitation systems, i.e., the static self-parallel excitation and the AC rotating excitation, are investigated in both frequency and time domain. Sensitivity analysis has been conducted on the linearized system model to obtain quantitative results and some key parameters (gains and time constants of AVR) affecting the dynamic reactive power reserve are identified, laying a foundation for optimizing excitation parameters of generators.