Control of reactive power of autonomous wind-diesel hybrid power systems

This paper presents the automatic reactive power control of an autonomous wind-diesel hybrid power system having an induction generator (IG) for a wind energy conversion system (WECS) and a synchronous generator (SG) for a diesel generator (DG) set. To minimize the gap between reactive power generation and demand, a variable source of reactive power is used such as static synchronous compensator (STATCOM). The mathematical model of the system based on reactive power flow equations is developed. Three examples of the wind-diesel hybrid power system are considered with different wind power generation capacities to study the effect of the wind power generation on the system performance. The study is based on small signal analysis by considering IEEE type-1 excitation system for the synchronous generator. The paper also shows the dynamic performance of the hybrid system for variable slip condition and 1% step change in reactive power load.