Multi-stage Robust Comprehensive Voltage Control in Active Distribution Network

As to the fact that the uncertainty and volatility of the power output of renewable sources greatly affect the voltage regulation of active distribution power network,a voltage control method of comprehensive active distribution network is presented based on robustness optimization theory by introducing demand respond technique and by using control ability of elastic load to optimize the operation of distribution power network on the base of voltage adjustment. The proposed method is completed in three phases. In the first stage, in order to determine the uncertain parameters,the uncertainty of renewable energy output is described by uncertain set, and the extreme scenario method is adopted to cut down uncertain set.In the second stage, the elastic load is applied to ease the load fluctuation by applying demand respond method.In the third stage, the DGs reactive power output actively participate in voltage control and cooperate with the traditional devices using bi-level planning to reduce the number of switching device operations and system network loss.In the end, the robustness, security and economy of the proposed model are analyzed using the PG&E 69-bus system.