Development of nonlinear predictor with several lead steps for continuation power flow calculation

This paper proposes a new continuation power flow calculation method in power systems. The continuation power flow calculation focuses on tracing power flow solutions in changing a specified value of the power flow calculation. It plays an important role in power system operation and planning. In particular, it is very useful for understanding load characteristics at each node. From a standpoint of static voltage instability, the results are used for drawing a P-V curve at a node. In practice, the continuation power flow calculation needs both computational efficacy and robustness of the algorithm. The mainstream of continuation power flow calculation is based on the predicted-corrector method. In this paper, a new nonlinear predictor is proposed to speed up computational time of the predictor-corrector method. The proposed method makes use of the solution extrapolation to evaluate a predicted value for several lead steps. The effectiveness of the proposed method is demonstrated in the IEEE 118-node and 300-node systems.