有源等效阻抗限流器的研究

有源等效阻抗限流器由电压型电力电子逆变器、直流电容、滤波器组成,通过变压器串联接入电网.电网正常时,限流器实现提高电能质量的功能或停止工作;故障发生后,立刻投入限流,对电网来说限流器等效为一可调阻抗,此阻抗设定为纯电感时可同时满足限流及使装置提供的有功最小.给出了实际电路与控制方法,理论分析与仿真结果均表明限流器具有优良的限流特性.

Study on Active Equivalent Impedance Fault Current Limiter

Active equivalent impedance fault current limiter(FCL)is composed of voltage source inverter,DC capacitor,filter and connected through transformer in series.At normal operation state,the FCL improves the quality of power supply,or it stops working.It begins to limit the fault currents immediately after faults occur.The FCL is regarded as an adjustable equivalent impedance and when the impedance is set as a pure inductance,the FCL can meet current limiting demand and provide minimum active power simultaneously.The practical circuit and control method are given.Theoretical analysis and simulation result verlfies that the FCL has a good current limiting characteristic.