83. Analysis of Variable Speed Constant Frequency Generator

Variable speed wind turbines 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 systems. 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 has been discussed.