摘要
超高压直流输电光控晶闸管阀监测系统向阀控制系统实时回报阀侧阈值电压信号,阀控系统综合该信号和网侧调度信息进行调度控制和保护。国内某站发生多个晶闸管电压监测单元(TVM)回报异常事件,为究其原因分析了阀监测系统,发现TVM脉宽控制电路存在不足。本文介绍了TVM架构和脉宽控制电路,剖析了正向过零电压监测(POS)、负向过零电压监测(NEG)、BOD过电压监测(BOD)3种脉冲脉宽控制电路原理,并给出了优化方案。在试验验证中,分别在工频有效值380 V和BOD峰值为7 kV的脉冲电压情况下对原电路和优化电路试验结果做对比,充分验证了电路优化的有效性,为国内外光控型晶闸管换流站阀监测系统后期升级和改造提供了技术支持和安全保障。
The light-trigged thyristor valve monitoring system of EHVDC returns the valve-side threshold voltage signal to the valve control system in real time.The valve control system integrates this signal and the grid-side dispatching information for dispatching control and protection.Several abnormal events of return of thyristor voltage monitoring unit(TVM)occur in a certain station in China.In order to investigate the cause,the valve monitoring system is analyzed,several shortcomings are found in the TVM pulse width control circuit.This paper introduces the architecture of TVM and pulse width control circuit,analyzes the principles of three kinds of pulse width control circuits,which are positive zero-crossing voltage monitoring(POS),negative zero-crossing voltage monitoring(NEG)and BOD over-voltage monitoring(BOD),and gives the optimization scheme.In the experimental verification,the experimental results of the original circuit and the optimized circuit are compared under the condition of the effective value of 380 V and the pulse voltage of 7 kV,respectively,which fully verifies the effectiveness of the circuit optimization.It provides technical support and safety guarantee for the later upgrade and transformation of the valve monitoring system of light-trigged thyristor converter station at home and abroad.
作者
王振
任孟干
刘坤
黄安付
周亮
张俊
WANG Zhen;REN Menggan;LIU Kun;HUANG Anfu;ZHOU Liang;ZHANG Jun(Maintenance&Test Center of EHV Power Transmission Company,CSG,Guangzhou 510663,China;C-EPRI Electrical Engineering Co.,Ltd.,Beijing 102200,China)
出处
《南方电网技术》
CSCD
北大核心
2020年第4期85-91,共7页
Southern Power System Technology
