基于阀电流实时计算的故障录波分析方法

Fault Recording Data Analysis Method Based on Real-time Calculation of Valve Current

针对当前缺乏通过录波数据实时分析换流阀运行状况的问题,提出了一种基于阀电流实时计算的故障录波分析方法。首先,分析了录波数据中的触发脉冲编码方法,并根据触发脉冲编码和换流阀外部交直流电流实时计算阀状态;其次,提出了利用故障录波实时计算得到的阀状态检测换相失败及其恢复的方法;最后,基于某实际直流工程录波数据得到的阀状态实时计算结果和换相失败检测结果,验证了所提方法的有效性。计算结果表明,所提方法可为直流系统的故障诊断和今后控制保护的优化提供基础。

A fault recording analysis method based on real-time calculation of valve current was proposed to address the current lack of a real-time analysis method for the operation status of converter valves through recorded data.Firstly,the triggering pulse coding method in the recorded wave data was analysed,and the valve status was calculated in real-time based on the triggering pulse coding and the external AC/DC current of the converter valve;secondly,a method for detecting commutation failure and its recovery based on real-time calculation of valve status using fault recording was put forward;finally,according to the real-time calculation results of valve status and commutation failure detection results based on the recording data from an actual high voltage direct current(HVDC)project,the effectiveness of the proposed method was verified.The calculation results indicate that the proposed method can provide a basis for fault diagnosis of DC systems and optimization of control protection in the future.