基于自关断器件的新型桥式短路限流器拓扑与控制策略

提出一种基于自关断开关器件的新型桥式短路故障限流器。该种单相(三相)限流器由1个整流桥、1个直流电感和1个(3个)旁路电感组成。直流电感用来限制故障初期的短路电流上升速度，其电感根据控制电路的响应速度和系统电压、电流额定值，以体积、成本最小为目标进行设计。旁路电感用来将短路电流限制到继电保护要求的数值上，其电感量根据系统电压和继电保护要求的短路电流设计。短路限流期间的电源电流仍为正弦量，因而不会对阻抗继电器、传统的电压电流互感器和总的继电保护方案产生不良影响。新型限流器的主电路得到了简化，控制电路和控制方法非常简单，动态性能得以提高。文中详细论述了用于三相系统的限流器的主电路拓扑结构、控制策略、参数设计与优化方法等。仿真和实验结果证明了所提新型限流器的有效性和实用性。

Topology and Control Strategy of Novel Bridge Type FCL Based on Self-turn-off Devices

A kind of novel bridge type fault current limiter (FCL) based on self-turn-off devices for three-phase power systems is proposed. The new FCL is composed of a rectifier bridge, a DC limiting reactor and one/three bypass reactor/ reactors for single-phase/three-phase structure. The increasing speed of the fault current just after the occurrence of a fault is limited by a DC limiting reactor, whose inductance is designed according to the response speed of the control circuit. The bypass reactors are designed in term of the requirements of coordination of protective relays. The source currents during limiting events are sinusoidal and have no harmful effect on the overall protection schemes, impedance relays and conventional current and voltage transformers. The main circuit of the novel FCL is simplified. The control method and control circuit is very simple. The dynamic performance of the new FCL is improved. The topologies of the FCL proposed for three-phase four-wire and three-phase three-wire power systems are investigated in detail. Parameter design and optimization are presented. Simulations and experimental result proved the feasibility of the new FCL.