考虑风电和负荷不确定性的灵活阻抗元件规划

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.