摘要
在交直流混合系统中,交流系统故障是引起直流系统发生换相失败故障的主要原因。从换相电压时间面积的角度,揭示了故障合闸角对换相失败影响的机理,指出了换相电压时间面积可作为评价直流系统抵御换相失败能力强弱的指标;在不同的交直流系统结构、参数、运行条件和故障情况下,故障合闸角对换相失败影响程度不同。应用PSCAD/EMTDC电磁暂态仿真软件,基于CIGRE高压直流(HVDC)输电系统标准模型,进行了大量仿真验证,证明了理论分析和判据的正确性,为交直流系统相互作用的分析、提高直流系统抵御换相失败能力的研究、直流控制系统参数的整定以及受端交流电网继电保护运行特性的研究提供了理论研究的参考。
In the AC/DC hybrid system,the AC-system fault is the main cause for the commutation failure of the DC system. From the view of the commutation voltage-time area,this paper reveals the mechanism of the effect of initial fault voltage angle （IFVA） on the commutation failure and indicates that the commutation voltage-time area can be the index for evaluating the risk of commutation failure. Furthermore,under different system structure,parameters,operating and fault conditions,the IFVA has different effects on the commutation failure. Extensive simulations based on the CIGRE HVDC system using PSCAD/EMTDC software are done to verify the theoretic analysis and the commutation failure criteria presented in this paper. The results show that the analysis and criteria are accurate and can be the theoretic basis of researches on AC/DC system interactions,commutation failure avoidance,control system settings in HVDC system and operation characteristic analysis of AC network relaying at the inverter side.
出处
《电力系统自动化》
EI
CSCD
北大核心
2010年第4期49-54,102,共7页
Automation of Electric Power Systems
基金
"十一五"国家科技支撑计划重大项目(2006BAA02A30)
国家自然科学基金资助项目(50977032
50337010)
粤港关键领域重点突破项目(2009498B3201)~~
