风电场高压电缆局放在线监测系统及去噪方法研究

Online Monitoring of Partial Discharge and Noise Elimination Method of High Voltage Cable in Wind Farm

鉴于风电场高压电缆绝缘故障易导致机组停运,研制了基于脉冲电流法的风电场高压电缆局放在线监测系统。构建了系统的硬件平台,阐述了系统的监测原理,并设计了提高局放在线监测灵敏度及安全性的系统构架方法。针对局放在线监测中电磁干扰难以消除的技术难题,提出了基于时域波形分析的局放脉冲辨识方法,通过简单的时域分析,即可实现放电脉冲的辨识,最后给出了系统在某风电场应用效果。实践证明,该系统及脉冲辨识方法具有较强的实用价值。

As insulation fault of high voltage cable in wind farm will easily cause the wind turbine unit outage,the high voltage cable on-line Partial Discharge(PD)monitoring system based on pulse current method was developed in this paper.The hardware platform of the system was built and a lot of methods of improving the safety and sensitivity of the system were designed.According to the technical problems that it was difficult to suppress the pulse shape interference during PD online monitoring,a PD pulse recognition method based on time-domain shape analysis was puts forward,which could easily realize the PD pulse recognition by analyzing the pulses shape.At present,the system was applied in a wind farm project.The application effect proved that the system developed and the pulse recognition put award in this paper had good project value.