摘要
故障暂态期间熄弧角的计算精度会影响换相失败预测和控制效果,为减小故障暂态期间熄弧角计算误差,通过对逆变器换相过程进行分析,推导建立了含直流电流变化量的熄弧角计算公式。提出了一种提高换相期间直流电流变化量预测精度的方法,构建了基于直流电流微分的换相失败预测判据。在预测型定熄弧角控制器中增添直流电流预测模块,改善故障暂态期间的控制效果。以PSCAD/EMTDC为平台搭建直流标准测试模型,对不同过渡电阻、电感的接地故障进行仿真测试,验证了所提换相失败预测判据与控制策略的有效性。
The prediction and mitigation of commutation failure are influenced by the accuracy of extinguishing angle during fault transient period.In order to reduce the calculation error of extinction angle during fault transient period,the calculation formula of extinction angle including DC current variation is deduced by analyzing the commutation process of inverters.A method to improve the prediction accuracy of DC current variation during commutation is proposed.A commutation failure prediction criterion based on DC current differential is proposed.The conventional predictive extinction angle controller is optimized to ameliorate its control effect during fault transient period by adding DC current prediction module.Based on PSCAD/EMTDC simulation platform,a DC standard test model is built to simulate and analyze under the grounding faults of different transition resistors and inductors,which validates the effectiveness of the predictive commutation failure method and control strategy.
作者
周博昊
李凤婷
宋新甫
尹纯亚
ZHOU Bohao;LI Fengting;SONG Xinfu;YIN Chunya(Engineering Research Center for Renewable Energy Power Generation and Grid Technology(Xinjiang University),Ministry of Education,Urumqi830047,Xinjiang Uygur Autonomous Region,China;Economic and Technical Research Institute of Xinjiang Electric Power Co.,Ltd.,Urumqi830011,Xinjiang Uygur Autonomous Region,China)
出处
《电网技术》
EI
CSCD
北大核心
2019年第10期3497-3504,共8页
Power System Technology
基金
国家自然科学基金项目(51877185)
国网新疆电力有限公司经济技术研究院(SGXJJY00GHJS1900041)~~
关键词
高压直流输电
直流电流变化量
熄弧角控制
换相失败预测
HVDC power transmission
DC current variation
extinction angle control
commutation failure prediction
