考虑风电和负荷不确定性的灵活阻抗元件规划

Flexible Impedance Device Planning Considering Wind Power and Load Uncertainty

输电阻塞是影响风电消纳的一个主要瓶颈。除了进行电力系统规划之外,灵活阻抗元件可以通过调节现有线路的阻抗,改变输电线路潮流,从而更加充分地利用风电资源。该文提出了一个考虑风电和负荷不确定性的灵活阻抗元件随机规划模型。通过基于大M值变换技巧和整数规划方法,将灵活阻抗元件规划引入的非线性约束线性化,使得整个模型变成一个商业优化软件可直接求解的混合整数线性规划模型。利用这个模型,论文研究了单个灵活阻抗元件的投资-效益、多个灵活阻抗元件的协同配置和不同场景的最优补偿水平等重要问题。修改的IEEE RTS-24系统的运行结果表明,合理地安装灵活阻抗元件不仅可以减少运行费用,而且可以提升风电的消纳水平,为大规模风电的接入提供一个可行的解决手段。

Transmission congestion is one of the main bottlenecks affecting full delivery of the produced wind power. Besides power system expansion planning, flexible impedance devices provide an option adjusting existing transmission line impedance to change power flow for better utilization of wind power resources. This paper proposes a flexible impedance device stochastic planning model considering wind power and load uncertainty. Big-M based reformulation technique and integer programming approach is utilized to transform nonlinear constraint introduced by flexible impedance device to an equivalent linear formulation to be directly and conveniently solved with mature commercial optimized software. Using the model, the paper explores some relevant problems, including investment benefit of single flexible impedance device, coordinative allocation of multiple devices and optimal compensation level in different wind-load scenarios. The results on modified IEEE RTS-24 system demonstrate that rational installation of flexible impedance devices can decrease operational cost and increase wind power penetration, providing a viable solution coping with large-scale wind power.