考虑智能软开关接入的主动配电网扩展规划方法

Active Distribution Network Expansion Planning Method Considering the Integration of Soft Open Point

柔性互联装置的广泛应用给主动配电网(active distribution network,ADN)规划带来巨大挑战。该文提出一种考虑智能软开关(soft open point,SOP)接入的ADN扩展规划方法,对变电站新建及扩容,线路新建,智能软开关、分布式电源、储能系统以及无功补偿等设备的选址定容进行协同规划。首先,考虑分布式电源出力和负荷功率不确定性,采用基于改进高斯混合模型的聚类方法构建典型日场景。在此基础上,以年综合费用最小为目标函数,建立了考虑SOP接入的ADN扩展规划模型。然后,通过线性化和二阶锥松弛技术,将原始非凸非线性规划模型转化为混合整数二阶锥规划(mixed-integer second-order cone programming,MISOCP)模型,并提出逐次收缩凸松弛算法以获得凸松弛间隙足够小的原问题最优解。最后,在54节点主动配电网算例上验证了所提规划模型和求解算法的可行性与有效性。

The wide application of flexible interconnection devices brings great challenges to the planning of active distribution network(ADN). This paper proposes a novel ADN expansion planning method considering the integration of soft open point(SOP), in which the investment of substation, transmission line construction, SOP, distributed generation, energy storage and reactive power compensation are planned coordinately. First, an improved Gaussian mixture model clustering method is adopted to deal with the uncertainties of the power of distributed generation and load demand. On this basis, an expansion planning model for ADN considering the integration of SOP is established, whose objective function is to minimize the annual comprehensive cost. Then, the original non-convex and nonlinear model is transformed to a mixed-integer second-order cone programming(MISOCP) model by linearization and convex relaxation techniques, and a successive contraction convex relaxation algorithm is developed to obtain the optimal solution of the original problem with a sufficiently small relaxation gap. Finally, the feasibility and effectiveness of the proposed planning model and solving strategy are verified on a 54-bus ADN.