单端量行波保护在中压柔性直流配电网的适应性分析

为了研究单端量行波保护原理在中压柔性直流配电网的适应性，首先通过对单端量行波保护的原理分析，得出其最佳应用条件。结合柔性直流配电线路的故障特征进行理论分析，从而得到行波保护在直流配电网中适应性的一般结论；然后搭建中压柔性直流配电网的电磁暂态模型并进行仿真，并与通过理论分析得到的结论进行了比较分析。研究结果表明，单端量行波保护能够适用于中压柔性直流配电线路的保护，且动作性能良好。仿真结果验证了理论分析的正确性。

Adaptability analysis of single terminal traveling wave protection in mid-voltage DC distribution based on VSC

For studying the adaptability of single terminal traveling wave protection in mid-voltage DC distribution based on VSC (voltage sourced converter), firstly the best working condition is obtained by analyzing the principle of singe terminal traveling wave protection, the general protection adaptability conclusion is reached by theoretical analysis based on the condition and the fault characteristics of DC distribution lines. Then, the electrical-magnetic model of DC distribution network is established and simulated, and the simulation results are compared with theoretical analysis results. The research shows that the single-terminal traveling wave protection can apply to VSC-based mid-voltage DC distribution line with good performance. The correctness of theoretical analysis is verified by simulation results. This work is supported by National Natural Science Foundation of China (No. 51477131).