CAJ | 학술논문

针对三相四线制静止式中频电源负载短路时功率器件极易损坏,传统的短路保护方法不能抑制短路瞬间快速上升的短路电流,且会造成负载供电断续等问题,在对传统短路限流保护加以改进的基础上,提出了一种软硬件协同控制的短路限流保护方法.为了抑制短路电流的快速上升,该方法运用固态断路器过零点瞬时关断的能力,采用短路限流值及短路电流瞬态变化率双重判断条件.结合短路时切换为恒流源控制的手段,克服了电力电子设备瞬时过载能力弱的缺点.实验结果证明了该方法可以保证短路故障的迅速切除及负载的持续供电.
침대삼상사선제정지식중빈전원부재단로시공솔기건겁역손배,전통적단로보호방법불능억제단로순간쾌속상승적단로전류,차회조성부재공전단속등문제,재대전통단로한류보호가이개진적기출상,제출료일충연경건협동공제적단로한류보호방법.위료억제단로전류적쾌속상승,해방법운용고태단로기과영점순시관단적능력,채용단로한류치급단로전류순태변화솔쌍중판단조건.결합단로시절환위항류원공제적수단,극복료전력전자설비순시과재능력약적결점.실험결과증명료해방법가이보증단로고장적신속절제급부재적지속공전.
The power cells can be damaged when short-circuit occurred in the three-phase four-wire 400 Hz solid-state power supply. The traditional methods can not ensure the rapid removal of short-circuit fault. In allusion to their limitation, a method of short-circuit protection based on software-hardware coordination control is presented. The method determines the conditions by using the current limit and the rate of transient short-circuit change. The method can overcome the instantaneous weak overload of power electronic devices and ensure the rapid removal of short-circuit fault and the continuous power supply by the quick turnoff of solid-state switch at the zero crossing and the constant-current source. The experiment results show that the method is useful and effective.