A HVDC system has some characteristics which should be considered in AC filter connection protection, such as harmonic, island operation, breaking capability of circuit breaker and TA saturation. An AC filter connection protection scheme was proposed with the consideration of these characteristics. The scheme includes differential protections taking accounts of TA saturation and over voltage prelections involving the factors of harmonic, AC over voltage, circuit breaker capacity and island operation. The proposed scheme has been successfully applied to a number of domestic projects of HV and EHV DC. Operation performences show that the proposed proleclion scheme can provide a good protection for AC filter connection.%高压直流输电系统具有存在谐波、孤岛运行、过电压及TA饱和等特点,交流滤波器连线保护需要充分考虑这些特点带来的影响,才能起到既全面又有效的保护作用.基于上述特点,提出一种新的交流滤波器连线保护方案,方案中考虑了TA饱和的差动保护和计及谐波、交流过电压、断路器分断能力及孤岛运行的过电压保护等.该方案已成功运用于国内多个高压及特高压直流工程中.运行情况表明其保护效果良好.
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