自适应限流型固态断路器的直流电源设计

Design of DC Power Supply for Self-adaptive Current-limiting Solid-state Circuit Breaker

为消除常规限流电抗对直流系统运行稳定性和直流断路器断流速度的不利影响,桥式限流型固态断路器实现了兼具自适应故障限流与断流的优异性能,但其桥电路中的直流偏置电源存在无过流保护和电源容量与投资成本相对较高的缺陷。针对桥式限流型固态断路器,文中设计了一种基于三相半波整流电路的直流偏置电源,提出了偏置电源参数选取和电压整定方法,有效减少了电力电子器件数量,实现了偏置电源过流保护电路,降低了偏置电源设计容量和制造成本。样机实验和仿真算例证明了所提出的自适应限流型固态断路器的偏置电源的优势。

In order to eliminate the adverse effects of conventional current-limiting reactance on the operation stability of DC system and the breaking speed of DC circuit breaker,the bridge-type current-limiting solid-state circuit breaker has achieved excellent performance of both self-adaptive fault current limiting and breaking.However,the DC bias power supply in the bridge circuit has the shortcomings of no overcurrent protection,relatively high power capacity and high investment cost.For the bridgetype current-limiting solid-state circuit breaker,this paper designs a DC bias power supply based on three-phase half-wave rectifier circuit.The method of selecting the parameters of bias power supply and setting the voltage is put forward,which effectively reduces the number of power electronic devices,realizes the over-current protection circuit of bias power supply,and reduces the designed capacity and cost of bias power supply.The prototype experiment and simulation examples verify the advantages of the proposed bias power supply of self-adaptive current-limiting solid-state circuit breaker.