考虑柔性交流输电系统设备控制的校正型安全约束最优潮流

为提升安全约束最优潮流调度的经济性与安全性,提出一种基于直流潮流的考虑柔性交流输电系统(FACTS)设备控制的校正型安全约束最优潮流模型。在线路故障发生后,通过FACTS设备校正措施,将线路潮流控制在其容许范围内。由于所提模型为大规模的非凸、非线性优化问题,难以直接求解,因此先采用大M法,将原非线性优化模型转换为混合整数线性规化模型,并采用Benders分解算法将转换后的模型分解为基态最优潮流主问题与N-1故障校验子问题。通过固定整数变量的方法,将非凸的混合整数优化子问题转换为线性规划子问题,从而能向主问题返回对应的Benders割。6节点系统与IEEE RTS-79节点系统算例验证了所提模型与算法的有效性。结果表明,考虑FACTS设备校正控制的安全约束最优潮流能有效提升调度运行的经济性。

Corrective Security-constrained Optimal Power Flow with Control of Flexible AC Transmission System Devices

To improve the economy and security of the security-constrained optimal power flow(SCOPF), a corrective security-constrained optimal power flow(CSCOPF)with the control of flexible AC transmission system(FACTS)devices is proposed based on the DC power flow. The FACTS device corrective action is adopted to control the line power flow within the allowable range while a contingency occurs. As the proposed model is a large-scale, non-convex and nonlinear model, it is hard to solve directly. First, the model is transformed into a mixed integer linear program(MILP)model by the Big-M method. Second, the Benders decomposition is used to decouple the proposed model into an optimal power flow master problem and an N-1 contingency check subproblem. Third, the non-convex subproblem is transformed into a linear program by fixing the binary variable, which can return the corresponding Benders cuts to the master problem. The proposed model and solution technique are tested on a 6-bus system and an IEEE RTS-79-bus system. Numerical results show that CSCOPF with the control of FACTS devices will leads to a lower operation cost. This work is supported Post-doctoral Science Foundation of China(No. 2016M590693).