A semi-definite programming approach for solving optimal reactive power reserve dispatch

It is well known that proper reactive power reserve (RPR) is essential to avoid voltage instability and abnormal voltage. Most literatures limits the maximum supply of generator reactive power output by the maximum loading point. Thus the optimization of RPR usually involves two operating points, i.e. current operating point and maximum loading point. However, extreme differences exist between the statuses of generators at those two operating points and cannot be given in advance. That means current techniques cannot solve optimal RPR model directly. In this paper, a semi-definite programming (SDP) approach for solving optimal RPR model is proposed. Proposed method transforms the solution into iterations and each iteration is an optimal power flow problem solved by SDP. For demonstrating the validity of proposed method, IEEE 118 system in three load scenarios is set as the test case. The results prove the effectiveness and robustness of the proposed method.