MICROPROCESSOR CONTROLLED WIND ENERGY POWER CONVERSION USING SELF-EXCITED INDUCTION GENERATOR

Abstract

The design, fabrication and performance characteristics of a microprocessor controlled wind energy conversion scheme using self-excited induction generator has been discussed in this dissertation. A DC machine has been used to simulate the wind turbine. It has been operated at different speeds randomly to represent the actual behavior of wind. A squirrel cage induction machine has been used as induction generator by connecting external fixed value capacitance to provide self-excitation. Both the voltage and frequency of induction generator output vary randomly with the wind speed. To utilize this power available at variable voltage and variable frequency two cases have been considered. (i) Autonomous application (ii) Generator feeding power to the grid. In the autonomous application the power available at variable voltage, variable frequency is converted into DC voltage using a fully controlled three phase converter. oIn second case i.e. generator feeding power to the grid, the variable voltage, variable frequency is first converted to DC voltage and then fed to the grid by using a line commutated inverter. The performance characteristics of both the schemes have been discussed in this dissertation. The chapter wise contents of the dissertation are as follows: The first chapter discusses the wind energy and induction generator for its exploitation. The second chapter describes the review of literature related to the proposed scheme. Chapter three deals in details about wind energy, induction generator and wind energy conversion using self-excited induction generator. A • comparative study of some 'schemes to utilize wind energy using induction generator is also given in this chapter. In the fourth chapter the complete hardware and its interfacing with the microprocessor have been discussed. Chapter five deals with the software development for the operation of system. Finally in the last chapter the experimental results of the two schemes mentioned above viz, autonomous application and induction generator feeding power to the grid are discussed and scope for future work is also given. 0