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The capacity allocation of D-STATCOM adapting to renewable energy generation in distribution networks

By means of distributed generation, renewable energy generation has become the inevitable development trend of electric power industry. Since the renewable energy generation is uncontrollable and its output is intermittent, its connection to the distribution networks leads to many problems such as voltage fluctuation. Aiming at this status, a capacity allocation method of D-STATCOM adapting to renewable energy generation is proposed in this paper, based upon the mechanism analysis of voltage drop and sensitivity analysis of distribution feeder parameters. To prevent the maximum voltage fluctuation, the proposed method is based on the voltage sensitivity of distribution feeder parameters, and provides a capacity allocation formula of D-STATCOM through unified-objective multiple-linear regression. Taking the actual distribution feeders as examples, the result of simulation prove that the proposed method is effective and it can calculate the reasonable capacity of D-STATCOM which could exactly prevent the maximum voltage fluctuation produced by renewable energy generation.