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 . first , the topology of pwm - fcl is proposed based on the analysis of others " s research 它是由一個(gè)以pwm原理控制的電感模塊和一個(gè)補(bǔ)償電容并聯(lián)后,再與一個(gè)限流電感串聯(lián)而成,改變脈沖的占空比可以得到變化的阻抗,實(shí)現(xiàn)限流和串聯(lián)補(bǔ)償。