Coordinated and optimized voltage control in active distribution based on two-stage programming algorithm

摘要

A coordinated and optimized voltage control method using two-stage programming algorithm is proposed in this paper. Based on the forecasts of loads and the maximum power output predictions of the distributed generators (DGs) day-ahead, it realizes the coordinated control among the active and reactive power of DGs, on-load tap changer (OLTC) and the shunt capacitors (SCs). With the voltage level for each node in qualified condition, this method takes reducing network loss, reducing regulation times of equipment and promoting power utilization ratio of DGs as target. Firstly, the differential evolution algorithm is used to obtain the feasible state when the statuses of the OLTC and the SCs are determined by the second stage. Then the DG optimal output from the first stage is fed back to the second stage, and the optimal values of the objective function are calculated by the dynamic programming algorithm while the voltage control plan for day-ahead is obtained. On this basis, the method is realized by MATLAB, and the case study verifies the validity and effectiveness of the proposed method.