An improved improved control scheme for grid connected doubly fed induction generator considering wind-solar hybrid system

摘要

This paper proposes a wind-solar hybrid generation scheme, along with an improved control strategy for grid connected wind energy conversion system (WECS) considering parameter uncertainty. In the proposed scheme, a photo voltaic (PV) supplemented rotor power management scheme (RPMS) has been developed for doubly fed indugion generator (DFIG) with stator connected to grid. The topology of RPMS is implemented in isolation with the grid during entire period of DFIG operation. The proposed scheme ensures an increased output power delivered to the grid during low wind speeds. The DFIG control scheme require accurate information for the rotor position and speed at all operating conditions, which is estimated in the proposed method without any significant dependency on machine parameters. The control strategy proposed in this paper is implemented with a 2.5 kW DFIG using dSPACE DS1104 module with PC interface, which produced satisfactory results. (C) 2015 Elsevier Ltd. All rights reserved.