Optimal range of loading for operating a fixed-speed wind turbine using a self-excited induction generator

Abstract

In the present study, a new strategy of analysis was used to determine the optimal interval of a single-phaseresistive load to operate a fixed-speed wind turbine. The essence of this optimal range is to enable the generator tohave stable voltages and current balances, large power, and an acceptable frequency range, and also mitigate generatoroverheating. The generator windings and excitation capacitances were prepared according to the C-2C connectionscheme with suitable values of excitation capacitances. The admittance matrix of the system was based on positive andnegative sequence generator voltages and was calculated by symmetrical components theory. The generator performancewas found through optimization of the determinant admittance matrix magnitude. Moreover, balanced position of thegenerator can be achieved near the maximum load power. Consequently, the best interval of resistive load of the generator(1.5 kW) was found around 2% voltage unbalance factor. The appropriate optimal load was approximately ±6% of theperfect balance resistive load value.