摘要
晶闸管级控制单元(TCU)是电控型换流阀控制与保护系统的核心部件,深入挖掘TCU单元监测信号规律对于换流阀运行状态实时监测与评估具有重要意义。本文在分析换流阀晶闸管级TCU工作原理以及监测回报信号时序特征基础上,结合实际工程中换流阀晶闸管运行老化后的实测I-V曲线特征,采用Matlab/Simulink建立了考虑多级晶闸管级串联的六脉动换流阀仿真模型,针对串联器件劣化的典型统计分布情况,研究了换流阀晶闸管级阻尼电容、晶闸管等效绝缘电阻等参数劣化对各晶闸管级电压波形、TCU单元监测信号时序分布特性的影响,并搭建了模拟试验验证平台。结果表明:晶闸管级的电路参数劣化时,其回报信号将超前于健康晶闸管出现,随着劣化程度加深,该时序差增大,且相较于阻尼电容参数劣化,回报信号时序对晶闸管绝缘劣化更为敏感;晶闸管绝缘劣化时,其余健康晶闸管相较于劣化晶闸管将承担更高的电压,而阻尼电容劣化的晶闸管级其承担的电压反而升高;最后通过实验对仿真所得的相关结论进行了验证。研究可为进一步基于TCU单元监测信号进行换流阀关键器件健康状态实时在线评估提供支撑。
The thyristor control unit(TCU)is the core component of the electric-controlled converter valve control and protection system.It is of great significance to explore the monitoring signal rules of the TCU unit in depth for real-time monitoring and evaluation of the operation status of the converter valve.Based on the analysis of the working principle of the TCU for the thyristor level of the converter valve and the timing characteristics of the monitoring databack signal,this article combines the I-V curve characteristics of the thyristor in the converter valve measured on-site.Using Matlab/Simulink,a six-pulse converter valve simulation model considering multi-stage thyristor series connection is established.In view of the typical statistical distribution of degradation of series devices,the influence of degradation parameters such as damping capacitors and equivalent insulation resistances of thyristor on the voltage waveform and monitoring signal timing distribution characteristics of each thyristor level in the TCU unit is studied,and a simulation test verification platform is built.The results show that when the circuit parameters of the thyristor deteriorate,its databack signal will appear ahead of the healthy thyristor,and the timing difference will increase with the degree of deterioration.In addition,compared with the deterioration of the damping capacitance parameter,the timing of the databack signal is more sensitive to the insulation deterioration of the thyristor.When the insulation of the thyristor deteriorates,the healthy thyristors will bear a higher voltage compared to the deteriorated thyristor,and the voltage borne by the thyristor with a deteriorated damping capacitance will increase.Finally,the relevant conclusions obtained from the simulation are verified through experiments.This research can provide support for further real-time online evaluation of the health status of key components of the valve based on TCU unit monitoring signals.
作者
刘隆晨
贾志杰
王鑫冰
庞磊
喻悦箫
LIU Longchen;JIA Zhijie;WANG Xinbing;PANG Lei;YU Yuexiao(State Grid Sichuan Electric Power Research Institute,Chengdu 610000,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《电工电能新技术》
CSCD
北大核心
2024年第11期43-54,共12页
Advanced Technology of Electrical Engineering and Energy
基金
国网四川省电力公司科技项目(521997220015)。
关键词
晶闸管级
回报信号
健康状态劣化
MATLAB仿真
thyristor level
databack signal
deterioration of health status
Matlab simulation
