基于Benders分解的交直流混合输电网随机扩展规划方法

Stochastic Expansion Planning of AC/DC Transmission Network Based on Benders Decomposition

采用随机场景模拟法描述机组和输电线路随机停电事故、负荷预测误差,提出了一种基于Benders分解的交直流混合输电网随机扩展规划方法。首先建立以交直流输电线路投资成本、失负荷成本、系统运行成本等为综合成本目标,采用Benders分解,将交直流混合输电网混合整数线性规划模型分解为规划主问题和可靠性校验和经济调度的子问题迭代求解。在6节点系统和改进的IEEE-118节点系统算例仿真结果表明:与交流输电系统相比,扩建直流输电线路可以节省更多的成本,在选择交流/直流输电线路时,直流线路输送潮流的可控性以及经济性都可以减少失负荷。

In this paper,the random scenario simulation method was employed to describe the stochastic outage accidents of units and transmission lines as well as load prediction errors.Additionally,a stochastic expansion planning method of AC/DC hybrid transmission network was proposed based on Benders decomposition.Firstly,the comprehensive cost objectives of AC/DC transmission line investment cost,loss of load cost and system operation cost were established.The mixed integer linear programming model of AC/DC hybrid transmission network was decomposed into the main planning problem and the subproblems of reliability verification and economic scheduling through Benders decomposition.The simulation results of the six-bus system and the modified IEEE-118 bus system demonstrate that,in comparison to the AC transmission system,expanding the DC transmission line yields greater cost savings.The selection of an AC/DC transmission line can enhance the controllability and economy of the transmission power flow,thereby reducing load loss in the DC line.