ENERGY MAXIMIZATION AND VOLTAGE REGULATION OF A STAND-ALONE VARIABLE SPEED WIND ENERGY CONVERSION SYSTEM

Document Type : Original Article

Authors

Electrical Engineering Department Faculp of Engineering, Minoufiya University, Egypt

Abstract

This paper presents a new control strategy of a stand-alone wind energy conversion system. The
proposed system consists of a three pbase induction machine connected to a variable speed wind
turbine through a step-up gear box. A current controlled voltage sonrce inverter (CC-VSI) with an
electronic load controller (ELC) is connected in parallel with the main load to the AC terminaIs of
the induction machine. The proposed control strategy is based on fuzzy logic control principles
which enhance the system performance. There are three fuzzy logic PI controllers and one
hysteresis cnrrent controller (HCC) which are used to extract the maximum available energy from
the wind turbine as well as to regulate the generator terminal voltage simultaneously against wind
speed and load variations. A complete mathematical model of the proposed system is developed in
order to simulate its performance with the proposed control strategy. Simulation results using
MatlabISimulink demonstrate the effectiveness of the proposed contrcl strategy in capturing the
maximum available energy Grom the wind turbine and in regulation of the generated terminal
voltage simultaneously against wind speed and load variations

Keywords