船舶直流电网短路故障限流保护方法

Current limiting protection method for short circuit fault of marine DC network

船舶直流电网短路下会导致电路中断,通过限流控制方法进行电网短路故障分析,提出一种基于LLC串联谐振保护控制的船舶直流电网短路故障限流保护方法。构建船舶直流电网短路故障下的耦合参数模型,测试电路的电流、电压和功率因素的参数,建立电网短路故障下的谐振参数分布矩阵,由此构造电网短路故障限流保护输出调节封闭方程组,调节输出线圈的次级侧绕组的自感,进行电流谐振控制,构建LLC串联等效电路模型,进行电网的连通性判别,计算电流超限阈值,实现船舶直流电网短路故障限流保护系统的硬件设计。测试表明,采用该方法进行电网的限流保护,能有效排除电网短路故障。

The short circuit of ship DC network will lead to the circuit interruption,through the current limiting control method to analyze the power grid short circuit fault.Based on LLC series resonant protection control,a current limiting protection for short circuit fault of marine DC network is proposed.The coupling parameter model of ship DC network short circuit fault is constructed,and the current of the circuit is tested.Based on the parameters of voltage and power factors,the distribution matrix of resonance parameters is established,and the closed equations of output regulation for current limiting protection of power network short circuit fault are constructed,and the self-inductance of secondary side winding of output coil is adjusted.The current resonance control,the LLC series equivalent circuit model are constructed,the connectivity of the power network is judged,the threshold of current overrun is calculated,and the current limiting protection of the ship DC network short circuit fault is realized.This method can effectively eliminate the short-circuit fault of the power network by using the current limiting protection.