直流闭锁暂态过电压机理与阀基电子设备逻辑优化OA

To address the abnormal operation of overvoltage protection during the valve control retrofit debugging of the Tian-Guang HVDC project,this paper conducts a comprehensive analysis of the event development process by examining the converter valve triggering and protection trip logic,and establishing an equivalent DC circuit model.The results indicate that the transient overvoltage during DC blocking was caused by abnormal conduction of the rectifier-side converter valve,rooted in a logic defect within the valve control system that allowed trigger pulses to be issued even after blocking.To resolve this,a logic optimization strategy is proposed to actively send cut-off pulses upon the disappearance of the deblocking signal.Using the RTDS(Real-Time Digital Simulator)hardware-in-the-loop platform of the Tian-Guang HVDC project,the fault was reproduced and the effectiveness of the proposed measure was verified.Both simulation and field application demonstrate that the optimization effectively prevents false triggering of the converter valve and overvoltage incidents.This study provides a practical reference for optimizing control logic and ensuring the safe and stable operation of DC engineering.