含规模化储能系统的最优潮流模型与求解方法

摘要

大规模储能系统的应用可提高电网运行的经济性，其优化调度的难点是如何处理能量约束。提出了一种含储能系统经济调度的滚动优化思路，在建立储能系统细化模型的基础上，构造了考虑规模化储能系统的多时段最优潮流模型，并对剩余能量约束进行了松弛与自适应调整。通过等效变换与Lagrange松弛，推导出其对偶问题进行求解。该对偶问题是一个凸的半正定规划，且在一定条件下对偶间隙为零，有效提高了解的全局最优性。对储能系统单点接入和多点接入的算例进行了测试，并与内点法计算的结果进行了比较，验证了所提模型和算法的有效性。%The application of large-scale energy storage system (ESS) can improve the economical efficiency of power system, while it brings optimal operation problem on how to deal with energy constraint. An idea of rolling optimization of operation considering ESS is proposed. On the basis of a detailed modeling of ESS, a multi-period optimal power flow (OPF) model including large-scale ESS is put forward, and the constraint of remaining energy is relaxed and adaptively adjusted. Through equivalent transformation and Lagrange relaxation, its dual problem can be derived, which is a convex semidefinite programming. It can be proved that under certain conditions the duality gap is zero. With this method the global optimal solution can be guaranteed. Examples of ESS integrating in single bus and multiple buses are tested. The results are compared with those of interior-point method, verifying the accuracy of the proposed formulation and solution method.