高压直流输电系统交流滤波器故障与保护分析

Fault and protection analysis of AC filter for HVDC transmission system

高压直流输电系统中的交流滤波器,兼具限制谐波电流及无功补偿的双重作用,其可靠运行直接影响整个直流输电系统的安全与稳定。对交流滤波器的短路故障、电容器损坏、设备过负荷、滤波器失谐等故障进行了故障机理分析。通过故障分析和EMTDC/PSCAD仿真,对各故障可配置的保护进行了系统的研究,指出了各保护的特点及存在的不足,为实际直流工程中交流滤波器保护的选型与配置提供了理论指导。

AC filters play the role of both restraining the AC side harmonics and reactive power compensation, whose reliable operation directly affects the HVDC transmission system. This paper analyzes the mechanism of the fault of the AC filter, including the short-circuit fault, capacitor damage, equipment overload, filter detuning and other faults. Through fault analysis and EMTDC/PSCAD simulation, a systematic study of the protection for each kind of fault is done. Also, the characteristics and shortcomings of each protection are pointed out, which provides theoretical guidance for protection selection and configuration of AC filter in HVDC transmission project.