APPLICATION OF SEIG FOR DC MICRO-GRID USING DIFFERENT CONTROL SCHEMES

Abstract

The generation of electricity from wind energy involves the usage of Induction Machines. Induction machines can be operated successfully as induction generators if there is sustained availability of excitation which is possible by connection of capacitor banks. Self-excited induction generators (SEIG) are preferred mostly in isolated areas to generate electrical energy. This dissertation work proposes the creation of fixed DC grid voltage sourced from SEIG operating under variable speed and load conditions using power electronics interfaces and suitable control schemes. For the designing of the proposed system, first step is to study and analyse the steady-state characteristics of the chosen Induction Generator. The value of capacitor bank is chosen according to the non-linear magnetisation characteristics of the Induction machine. Two different topologies are designed for the achievement of proposed work. One by using Uncontrolled Diode Bridge Rectifier (DBR) and DC-DC converter and the other by using Hysteresis Current Controller and Pulse width Modulated (PWM) Rectifier system. For both the topologies, MATLAB Simulink® models are designed for the implementation of control strategy. Three Different controllers namely PI , ANN and ANFIS are employed in MATLAB® to get the desired results.