面向有源配电网运行经济性的智能储能软开关规划

在可再生分布式电源大量接入的背景下,结合智能软开关(soft open point, SOP)的功率调节能力和储能系统(energy storage system, ESS)的电能储存特性,智能储能软开关(SOP integrated with ESS, ESOP)可以从时间与空间2个维度优化有源配电网潮流分布,提升运行经济性。考虑到智能储能软开关物理结构复杂、投资成本较高,因此,在规划阶段应选择合理的换流器与储能电池容量配置方案以提升有源配电网综合效益。首先介绍了智能储能软开关的物理结构与数学模型;其次,以有源配电网年综合费用最小为规划目标,考虑智能储能软开关运行约束以及有源配电网运行约束,建立了提升有源配电网运行经济性的智能储能软开关规划模型;最后采用二阶锥规划算法对上述规划模型进行求解,并以改进的IEEE 33节点测试算例验证了所提规划模型的有效性。结果表明,提出的智能储能软开关规划方法能够有效降低有源配电网综合成本,提升有源配电网的运行经济性。

Optimal Planning for Soft Open Point Integrated with ESS to Improve the Economy of Active Distribution Network

With the increasing penetration of renewable distributed generators (DGs), combined with the power regulation capabilities of soft open point (SOP) and the characteristics of energy storage system (ESS), SOP integrated with ESS (ESOP) can adjust the power flow and enhance the economy of active distribution networks (ADNs) in spatial and temporal aspects. Considering the complex physical structure and high investment cost of ESOP, reasonable capacity configuration of inverter and energy storage battery should be selected in the planning stage to enhance the comprehensive benefits of the ADNs. Firstly, the structure and mathematical model of ESOP are elaborated in this paper. Secondly, to establish the ESOP planning model of ADNs, the minimum comprehensive cost of the network is taken as the object and the operation constraints of ESOP and ADNs are considered. Finally, the second-order cone-programming algorithm is used to solve the proposed model, and the effectiveness of the proposed planning model is verified by a modified IEEE 33-node test system. The results show that the proposed ESOP planning model can effectively reduce the comprehensive cost and improve the economy of ADNs.