一种可改善配电网电能质量的故障限流器的拓扑与仿真

Topology and Simulation of a Fault Current Limiter for Distribution Power Quality Improvement

提出了一种可以改善配电网电能质量的故障限流器,它是由一个以脉宽调制(PulseWidthModulation,缩写为PWM)原理控制的电感模块和一个补偿电容并联后,再与一个限流电感串联而成。改变脉冲的占空比可以得到变化的阻抗,实现限流和串联补偿,进而有效地改善配电网在故障期间的母线电压下陷(VoltageSags)问题。此外,本装置还有产生谐波少、能抑制谐波传播等优点。使用MATLAB进行数字仿真证明了此装置的有效性。

A fault current limiter for improvement of distribution power quality is proposed. It is composed of a limiting reactor and a compensator capacitor which is in parallel with a pulse width modulation (PWM ) switched reactor. A variable reactance can be realized by duty ratio control. Then the FCL can attain to the goal of controllable limiting fault current and controllable series compensation. The bus voltage sags can also be well improved during the fault due to the fast action of the FCL. Low harmonics can be reached through pulse width modulation. The digital simulation proved the efficiency of the device with MATLAB.