A Linearized OPF Model With Reactive Power and Voltage Magnitude: A Pathway to Improve the MW-Only DC OPF

作者：Yang, Zhifang; Zhong, Haiwang; Bose, Anjan; Zheng, Tongxin; Xia, Qing^*; Kang, Chongqing

来源：IEEE Transactions on Power Systems, 2018, 33(2): 1734-1745.

DOI：10.1109/TPWRS.2017.2718551

• Linear approximation
• locational marginal price (LMP)
• losses
• market clearing
• optimal power flow (OPF)

In this study, a linearized and convergenceguaranteed optimal power flow (OPF) model with reactive power (Q) and voltage magnitude (v) is proposed. Based on a linearized network model, a fully linearly-constrained OPF model is formulatedwith constraints on Q and v and limits on the apparent branch flow. Compared with the commonly used DC OPF method, the proposed method narrows the deviation fromthe AC OPF solution without requiring any additional information of the power grid. The locational marginal price (LMP) of the proposed method is closer to the AC OPF solution than the DC OPF method. The marginal price of the reactive power (Q-LMP) is provided, which offers the opportunity to price the reactive power. Case studies on several IEEE and Polish benchmark systems show that the proposed OPF method substantially enhances the performance of the prevalent DC OPF method. In addition, it is shown that if the accuracy of the linearized networkmodel needs to be further improved, such as that during the iterative quasi-optimization process that reconstitutes the AC feasibility, a solution that is notably close to the optimum of the AC OPF model can be obtained by taking only one more iteration.

• 出版日期2018-3
• 单位清华大学