串联补偿型饱和铁心故障限流器气隙结构的优化设计

Optimization Design of Air Gap Structure of Series Compensating Saturated Core Fault Current Limiter

饱和铁心故障限流器应用于串联补偿时会造成较高的谐波污染。为保证电力系统的安全稳定运行,文中依据铁心分段饱和的原理设计了一种改进气隙结构的饱和铁心故障限流器。通过JMAG建立不同气隙结构的饱和铁心故障限流器仿真模型。将限流器的电流磁链关系导入MATLAB/Simulink并建立相应的仿真系统模型,从而进一步对比两种限流器模型的控制特性、谐波含量以及故障限流能力。研究结果表明,在不损失限流能力的情况下,相比于全气隙结构,改进气隙结构的饱和铁心故障限流器具有约1.5倍的电抗调节范围和较低的谐波畸变率。

Saturated core fault current limiter will cause higher harmonic pollution when used in series compensation.In order to ensure the safe and stable operation of the power system,the saturated core fault current limiter with improved air gap structure is designed based on the principle of segment saturated core.The simulation models of saturated core fault current limiter with different air gap structures are established by JMAG.The relationship between current and flux of the current limiter is imported into MATLAB/Simulink and the corresponding simulation system model is established to further analyze and compare the control characteristics,harmonic content and fault current limiting ability of the two current limiter models.The results show that the saturated core fault current limiter with improved air gap structure has about 1.5 times of reactance regulation range and lower harmonic distortion rate when compared with the full air gap structure without losing the current limiting capacity.