空心超导变压器参数设计对可控阻抗型限流器性能的影响  

Influence of air-core superconducting transformer parameters on performances of controllable impedance type fault current limiter

作　　者：陈磊[1] 唐跃进[1] 陈楠[1] 宋萌[1] 石晶[1] 程时杰[1] 

机构地区：[1]华中科技大学超导电力科学研究与发展中心,湖北武汉430074

出　　处：《电力自动化设备》2009年第6期15-18,23,共5页Electric Power Automation Equipment

基　　金：国家863计划资助项目(2007AA03Z243)~~

摘　　要：介绍了可控阻抗型超导限流器的电路结构和工作原理,该限流器由空心超导变压器及PWM变流器组成。故障发生后,通过变流器控制变压器二次侧注入电流的相位和幅值,进而调节限流器的等效阻抗,从而实现抑制短路电流的目的。针对空心超导变压器参数设计对限流器工作性能的影响,以初始补偿电流、不同工作模式下的限流阻抗以及变流器的功率传输为指标,进行了理论研究;以该型限流器在一个三相接地系统的应用为例,利用Matlab建立仿真模型,分析了不同变压器参数下限流器工作性能的差别。仿真结果与理论分析相符,得出如下结论:增大变压器一次侧自感有利于加强限流能力;增加变比会导致初始补偿电流的上升;提高耦合系数有助于降低变流器的无功功率输出。The structure and operation principle of controllable impedance- type SFCL （Superconducting Fault Current Limiter） are introduced,which is composed of an air-core superconducting transformer and a PWM converter. In the case of short- circuit,the output current amplitude and phase of PWM converter are controlled to adjust the equivalent impedance of current-limiter for fault current suppression. To study the influence of air-core superconducting transformer parameters on the performances of SFCL,theoretical analysis is carried out with the initial compensation current,current- limiting impedance under different operation modes and power transmission of PWM converter as performance indexes. For a grounded three-phase power system,the simulation model of SFCL is built with Matlab and the differences of its working performances under different transformer parameters are analyzed. Simulation results fit well with the theoretical analysis, and conclusions are shown as follows：raising self-inductance of primary winding is beneficial to current -limiting capacity;enhancing transformation ratio leads to increase of initial compensation current;increasing coupling coefficient is helpful to reduce the reactive power output of converter.

关 键 词：可控阻抗型超导限流器 空心超导变压器 参数设计 变比 耦合系数 功率传输 

分 类 号：TM471[电气工程—电器] TM26[一般工业技术—材料科学与工程]