面向配网多馈线互联的柔性多状态开关拓扑选型分析

柔性多状态开关(flexible multi-state switch，FMS)是采用电力电子技术的新型智能配电设备，有助于解决配电网馈线功率失衡、电压波动越限等问题。多端FMS能够实现多条馈线柔性互联，其拓扑选型对设备的经济效益、联接限制等方面均有重要影响。文中以应用于中压配电网的三端FMS拓扑为例，就拓扑结构、性能和应用场景进行探索。重点针对模块化多电平变流器拓扑、九桥臂变流器拓扑和桥臂分叉变流器拓扑，分析各拓扑运行特性，并计算对应的核心参数、运行损耗和运行范围，进而得出各拓扑建设成本、占地空间、运行效率和潮流调节能力等指标的对比结果。最后，给出三种拓扑所适用的场景，为配网系统中多端FMS拓扑的选取提供建议。

Topology Selection Analysis of Flexible Multi-state Switch for Distribution Network Multi-feeder Interconnection

Flexible Multi-state Switch (FMS) is a new type of intelligent power distribution equipment using power electronics technology, which helps to solve the problems of power distribution network feeder power imbalances and voltage fluctuations beyond limits. Multi-terminal FMS can realize flexible interconnection of multiple feeders, and its topology selection has important impacts on the economic benefits and connection limitations of the device. This article takes the three-terminal FMS topology used in the medium voltage distribution network as an example to explore the topological structure, performance, and application scenarios. Focusing on modular multilevel converter topology, nine-arm modular multilevel converter and bifurcate modular multilevel converter, the operating characteristics of each topology are analyzed, and the corresponding core parameters, operating losses and operating ranges are calculated. The comparison results of various topological construction costs, floor space, operating efficiency and power flow regulation capabilities are presented. Finally, the scenarios applicable to the three topologies are given to provide recommendations for the selection of multi-terminal FMS topology in the distribution network system.