Abstract
Voltage stability margin is associated with reactive power reserve. From this point of view, an optimization method to schedule VAR sources is proposed. Generators have various efficiency of reactive supports to voltage stability because of their location and system condition, etc. Generator participation factor is introduced to assess the importance of generator reactive reserve. The optimization model which maximizes system reactive power reserve is proposed. The model is decomposed to generator master problem and capacitor sub-problem so as to get a better optimization result. The method is tested on IEEE_39 system, and the result shows that the proposed optimization method can improve voltage stability tremendously.
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