Reactive power management modeling of an autonomous Wind-Diesel Power plant

This paper presents a small signal analysis and modeling in an isolated Wind-Diesel Power plant. Such systems are increasingly implemented for power generation in isolated areas where large continental power grids are not reachable. The considered system is mainly constituted by a diesel prime mover driving a Synchronous Generator (Diesel genset), a Self-Excited Induction Generator based Fixed-Speed Wind Turbine, a static synchronous reactive power compensator (STATCOM) and all the active power sinks lumped as a single Load. The reactive power expression of each aforementioned subcomponent is carried out and a small signal analysis is used to derive relationships between reactive powers transients and voltage drifts on the main distribution AC bus. The produced dynamic models have been implemented and simulated using Matlab/Simulink software tools and the main results are carried out. The main results show the influence of the steady state prior to the transients, the effect of the compensation and the influence of the wind power variations. The validity of the model is proven by good accuracy with other models developed in the literature. Presented models can be used for system stability analysis, voltage regulation and reactive power compensation purposes.