摘要
为提高电力电子变换设备运行的抗扰性及保护有效性,该文结合AC-DC-AC变换系统拓扑结构和工作原理,研究了整流及逆变过程中各类型的短路故障特征,发现故障主要集中在功率开关器件、移相变压器及交直流输电线路上,对应提出零序电压/电流保护、改进型复合电压过流保护以及直流母线保护等多层保护配置,解决了短路过流、零序分量、故障穿越等问题,构建了具备完整性和系统性的故障分析方法及保护算法,最后通过MATLAB/Simulink搭建故障仿真模型并进行动态试验,验证了文中所给出的保护原理的可行性。
In order to improve the disturbance immunity and protection effectiveness of the operation of power electronic conversion equipment,combined with the topology structure and working principle of AC-DC-AC conversion system,this paper studies the characteristics of various types of short circuit faults in the process of rectification and inverter.It is found that the faults are mainly concentrated in the power switching devices,phase-shifting transformers and AC-DC transmission lines.Accordingly,multi-layer protection configurations such as zero-sequence voltage/current protection,improved composite voltage overcurrent protection and DC bus protection are proposed to solve problems such as short-circuit overcurrent,zero-sequence component and fault traversal,and construct a complete and systematic fault analysis method and protection algorithm.Finally,a fault simulation model was built by MATLAB/Simulink and dynamic tests were carried out to verify the feasibility of the proposed protection principle.
作者
李阳
刘健
LI Yang;LIU Jian(School of Electrical and Information,Wuhan Institute of Technology,Wuhan 430000,China)
出处
《自动化与仪表》
2022年第4期15-20,共6页
Automation & Instrumentation
基金
研究生教育创新基金资助项目(CX2020064)。
关键词
AC-DC-AC
短路故障
保护配置
零序分量
AC-DC-AC
short-circuit fault
protection configuration
zero sequence component
