| 引用本文: | 王世蓉,李民族,唐晓玲.改进式晶闸管串联调压电容无功补偿装置的断态过电压仿真[J].电力自动化设备,2006,(9):34-38 |
| .Simulation of thyristor off-state over-voltage in improved capacitor var compensation device of thyristor series voltage regulation[J].Electric Power Automation Equipment,2006,(9):34-38 |
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| 摘要: |
| 改进式晶闸管串联调压电容无功补偿装置的晶闸管开关带电断开时,要承受危险的断态过电压,为保证装置的安全运行,阐述了晶闸管断开时过电压产生的原理及状态。对装置投入、换级以及故障等各种工况下断态过电压的大小进行了理论分析,用电磁暂态分析PSCAD/EMTDC软件对典型工况的断态过电压进行了仿真分析。采用氧化锌压敏电阻过压保护后,重新对严重故障时的断态过电压进行了仿真。结果表明,装置投入、换级等正常操作时,晶闸管开关断态过电压不高;但在装置故障时,会出现严重过电压,若过压保护动作后,断路器在0.1s内跳闸,压敏电阻通流容量不很大。 |
| 关键词: 串联调压,无功补偿装置,晶闸管开关,断态过电压,压敏电阻,EMTDC |
| DOI： |
| 分类号:TM761.12 |
| 基金项目:贵州省科技攻关项目 |
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| Simulation of thyristor off-state over-voltage in improved capacitor var compensation device of thyristor series voltage regulation |
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WANG Shi-rong LI Min-zu TANG Xiao-ling
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| Abstract: |
| The thyristor in the improved capacitor var compensation device of thyristor series voltage regulation endures unsafe off-state over-voltage when it switches off on line.To ensure its safe operation,the principle and conditions of the over-voltage generated under off-state of thyristor are explained.States of off-state over-voltage is analyzed theoretically under different device working conditions,such as put-in,tap change and faults.Simulation results with PSCAD / EMTDC software are presented for typical working conditions.For serious fault conditions,the simulation is redone with ZnO varistor over-voltage protection being adopted.Results show that the off-state over-voltage of thyristor is not high for normal operations,such as put-in and tap change,but when there is fault in the device,serious off-state over-voltage will occur.If circuit breaker trips within 0.1 s after the over-voltage protection acted,the current passing ZnO varistor is not high. This project is supported by the Key Scientific Foundation of Guizhou Province[GY(2005)3019]. |
| Key words: series voltage regulation,reactive power compensation device,thyristor switch,off-state over-voltage,varistor,EMTDC |
