磁通约束型超导限流开关系统应用

System Application of Flux-Coupling Superconducting Fault Current Limiting Switch

随着社会的日益进步和经济的快速发展,对电力需求量越来越大,电力系统的规模也进一步扩大,致使其短路电流水平不断提高,超过现有断路器的遮断能力。磁通约束型超导限流开关是一种具有快速响应速度且能有效抑制短路电流的装置。结合10kV特定传输线路,选取限流开关各部件参数,并提出相应的控制策略。再者,对限流开关内的耦合超导电感线圈进行初步的电磁设计。同时,由于引入限流开关可能会影响电力系统内原有继电保护装置的性能,针对距离保护,理论分析故障过程中限流阻抗的投切对其工作特性的影响,并提出改善措施。最后在Matlab/Simulink中搭建带有磁通约束型限流开关的10kV电力系统仿真模型,仿真研究证明了上述分析结论。结果表明,引入磁通约束型限流开关能有效降低故障电流水平,但其会缩短电力系统原有距离保护装置的保护范围,而对阻抗继电器的动作特性采用合理的修订方法可消除该影响。

With the development of society and economy,the demand for electricity is increasing,and the scale of the power system is further expanded,resulting in the continuous increase of the short-circuit current level and exceeding the interrupting capacity of the existing breaker.The flux-coupling superconducting fault current limiting switch(FC-SFCLS)is a device with fast response speed and can effectively suppress short circuit current.For the specific application scenario of a 10kV transmission system,the parameters of the current limiting switch are selected and the corresponding control strategy is proposed.Then,the preliminary electromagnetic design of the superconducting coupled inductor coils is performed.However,the introduction of current limiting breaker may affect the performance of original relay protections of power system.Thus,the influence of current limiting impedance on distance protection performance is analyzed,and the improvement measures are then put forward.Finally,a 10kV power system model integrated with the current limiting breaker is built in Matlab/Simulink.The results show that the introduction of flux-coupling fault current limiting breaker can effectively reduce the fault current level,but it will shorten the protection range of original distance protection devices.The influence can be eliminated by adopting a reasonable revision method.