影响±800kV特高压直流输电交流滤波器失谐保护准确性的原因分析

Influencing Factors for AC Filter Mismatching Protection Accuracy of ±800 kV UHV DC Transmission

通过对锦苏±800 kV特高压直流输电苏州站投运过程中失谐保护频繁发信的过程、保护逻辑、动作等详细的分析,指出6次谐波分量的影响,提出需要紧密监视直流偏磁对电网的影响,测量交流系统谐波电压情况;并针对这种状态研究换流变充电励磁涌流对交流系统谐波的影响。

This paper makes the detailed analysis of the mismatching protection frequent singalling in the operation process of SuZhou Station of Jin-Su ± 800kV UHV DC transmission, including the signalling process, protection logic and action. The influence of six-time harmonic component is pointed out, and it is emphazied that the influence of DC bias on power grid should be closely monitored, and that the harmonic voltage of AC system should be measured. Accordingly the influence of the rheological charging excitation inrush current on t the harmonic voltage of AC system is researched.