Self - Excitation and Voltage Control of an Induction Generator in an Independent Wind Energy Conversion System

This paper proposes an excitation system and voltage control for a Squirrel Cage Induction Generator in an independent wind energy conversion system. Energy is considered to be very promising alternative for power generation because of its tremendous environment, social, and economic benefits. Of all wind power technologies, the variable speed systems employing the Squirrel Cage Induction Generator are the cheapest and simplest. A voltage source converter directly interfaces the Squirrel Cage Induction Generator through dc load network and also be the DC link of an inverter. The Squirrel Cage Induction Generator which is excited using voltage source converter connected to a single capacitor and battery on the DC side. In this paper, Space vector pulse width modulation technique is used because of their easier digital realization, efficient use of supply voltage and better dc bus utilization. A controller is specifically designed that keeps the DC bus voltage at a constant value under wind speed and electrical load variations. The proposed system with its controller is modeled and simulated using MATLAB/SIMULINK software.