基于站域信息的整流站100Hz保护优化方案

100 Hz Protection Optimization Scheme of Rectifier Station Based on Station Domain Information

摘要:

对于现有仅利用单一设备量测量信息进行故障判断的100 Hz保护，其动作响应存在一定的盲目性，在换流站交流区域故障时适应性不足。对此提出基于站域信息区分整流站直流区域故障和交流区域故障，实现100 Hz保护优化，赋予100 Hz保护识别整流站直流区域故障与交流区域故障的能力。基于100 Hz保护误动原因分析，提出换流母线基频负序电压与直流线路二次谐波电压的相关系数，构建整流站故障区域识别方法。仿真结果表明，该方法不受故障类型、故障位置、过渡电阻、故障初始角以及噪声干扰的影响，可靠性高。

Abstract:

Aiming at the existing 100 Hz protection using only a single device measurement information for fault judgment, the action response of the protection is blind to a certain extent, and its adaptability is insufficient when the AC area of converter station fails. It is proposed to distinguish the DC area fault from the AC area fault of rectifier station based on station domain information, which realizes 100 Hz protection optimization and gives 100 Hz protection the ability to identify the DC area fault and the AC area fault of rectifier station. Based on the cause analysis of misoperation of 100 Hz protection, the correlation coefficient between the negative sequence voltage of converter bus fundamental frequency and the second harmonic voltage of DC line is proposed, and the fault area identification method of rectifier station is constructed. The simulation results show that the method is not affected by fault type, fault location, transition resistance, fault initial angle and noise interference, and has high reliability.