VARIABLE SPEED CONSTANT FREQUENCY GENERATOR

Abstract

Variable speed wind turbine generators provide the opportunity to capture more power than fixed speed turbines. However the variable speed machine output can be variable voltage and variable frequency for fluctuating wind speeds. The quality of power output can be improved if adequate controls are incorporated in the system. The fluctuating wind generator output needs to be controlled. To this effect, one needs to study the dynamic characteristics of the generator system under variable speed. Based on the dynamic performance of the system, better controls can be designed. The variable speed generators can create voltage and frequency fluctuations and power surges in a weak network. The effect of the commonly used control techniques like converter/inverters and its control on the quality electricity obtained with reduced harmonics are discussed in this dissertation. The simulation of the system can be carried out to obtain the fixed output voltage and frequency irrespective of input.