Optimizing Generator Reactive Power Resources

A method is described for selecting generator step-up and auxiliary transformer tap positionsto provide the desired reactivepower requirementsin a coal burning power plant. It is shown how a generator could be made to absorb reactive power, when previously unable to do so, by adjustment of tap positions on the generator stepup and auxiliary transformers. The approach described provides an indication of the range of reactive power outputs that are available for different tap positions. This information would facilitate the alteration of transformer tap positions to make more effective useof generator reactive power resources.