交流滤波器C1电容器保护配合策略研究

以南方电网各工程采用的交流滤波器C1电容器保护配合策略及运行情况为研究对象,对三种不平衡保护原理的优劣进行分析,指出当前计数法不平衡保护原理中存在的动作灵敏性、准确性的缺陷。综合比值法、桥差法和脉冲法的原理,提出了改进脉冲不平衡保护计数定值的建议,并首次提出了多段位计数的方法。基于一些特殊运行情况,提出了与桥差保护的配合思路。

Study on the coordination strategy of the C1 capacitor protection of AC filter

The coordination strategy and operation condition of the C1 capacitor protection of AC filter used in HVDC systems of CSG are analyzed. The advantages and disadvantages of the three unbalance protection principles are studied. The paper points out the defects in the sensitivity and reliability of the present unblanced protection principle using the counting method. Combining the ratio method, bridge differential method and pulse method, the paper proposes to improve the fixed value of pulse unbalance counting protection and first puts forward the multi-grade counting method. The coordination with the bridge differential protection is proposed based on the special operation status.