考虑风电不确定性的交直流混联电网受端系统恢复决策优化方法

Optimization Method of Restoration Decision for the Receiving-end System of Hybrid AC/DC Power Grids Considering Wind Power Uncertainty

随着风电渗透率的不断提高,恢复方案受接入风电不确定性的影响越来越大。对含高压直流馈入的受端系统,恢复期间高压直流输电(high-voltage direct current,HVDC)的启动及运行对交流系统的网架结构及功率调度方案均有较高要求。为最大限度地利用HVDC的支援功率加速系统恢复进程,在对HVDC馈入的受端系统进行恢复决策时考虑风电不确定性的影响具有十分重要的意义。为此,该文提出HVDC馈入下考虑风电不确定性的受端系统恢复决策方法。首先,基于非全维凸包不确定集详细刻画风电极端场景;其次,考虑风电不确定性及HVDC的启动及运行特性建立两阶段鲁棒恢复模型;然后,通过伴随网络法将HVDC的启动及运行特性进行线性化处理;之后,采用列与约束生成算法求解所构建的优化模型。最后,通过新英格兰10机39节点算例及我国西南某省实际算例验证所提方法的有效性与实用性。

With the continuous improvement of wind power penetration rate, the restoration plan is increasingly affected by the uncertainty of accessing wind power. For the receiving end system containing high-voltage direct current transmission (HVDC), the start-up and operation of HVDC during the restoration process has high requirements for the network structure and power scheduling scheme of the AC system. It is of great significance to consider the impact of wind power uncertainty when making restoration decision on the receiving end system fed by HVDC in order to maximize the support power of HVDC to accelerate the system restoration process. Therefore, the paper proposes a restoration decision method of the receiving end system fed by HVDC considering wind power uncertainty. First, the partial- dimensional correlation-aided convex hull uncertainty set (CHUS) is used to characterize the extreme wind power output scenarios. Second, a two-stage adaptive robust restoration model considering the wind power uncertainty and the start-up and operational characteristics of HVDC is established. Then, the start-up and operational characteristics of HVDC are linearized using the adjoint network method. Next, the column and constraint generation algorithm (C&CG) is used to solve the optimization model. Finally, the effectiveness and practically of the proposed method are verified by the New England 10-unit 39-bus case and an actual system from a southwestern province of China.