支撑电容可分离的直流变压器短路故障电流限流控制方法  

Short-Circuit Fault Current Limiting Control Method of DC Transformer with Separable Supporting Capacitor

作　　者：卓超然 张笑天[1] 张雄 杨旭[1] Zhuo Chaoran;Zhang Xiaotian;Zhang Xiong;Yang Xu(School of Electrical Engineering Xi’an Jiaotong University,Xi’an 710049 China)

机构地区：[1]西安交通大学电气工程学院,西安710049

出　　处：《电工技术学报》2022年第2期424-432,共9页Transactions of China Electrotechnical Society

基　　金：柔性直流电网故障电流抑制的基础理论(2018YFB0904600)。

摘　　要：直流配电系统因线路阻抗低,线路短路故障时电流上升率高,会造成电流限流困难及线路设备二次恢复运行速度慢等问题。该文针对直流配电网中目前存在问题进行分析,提出一种主动控制实现的电力电子变压器短路电流限流新方法。通过对电力电子变压器电路拓扑的改进,并辅以相应的输出电流主动控制方法,实现在发生直流短路故障时切除变压器内部的支撑电容,使该储能元件中的能量不再对线路产生冲击大电流。同时,该方法可对电流实现快速跟踪控制,以满足新能源发电设备实现低电压穿越时的电流控制需要。最后通过仿真和硬件在环实验验证了该文所提方法的正确性。Due to the low line impedance of the DC power distribution system,the current rise rate is high when the line is short-circuited,which causes problems such as difficulty in current limiting and slow recovery of line equipment.This paper analyzes the current problems in the current-limiting reactance method used in DC distribution networks,and proposes a new method for active current-limiting control of short-circuit current using power electronic transformer equipment in the distribution network.The improvement of the circuit topology and the active current control method can realize that the energy in the internal support capacitor of the converter no longer produces a large impact on the line when a short-circuit fault occurs,and can quickly track and control the current in the distribution network line.Renewable energy power generation equipment achieves current control requirements during low voltage ride-through.Hardware-in-the-loop experiments verify the correctness of the method in this paper.

关 键 词：电力电子变压器 支撑电容 短路故障 限流 

分 类 号：TM46[电气工程—电器]