CAJ | 학술논문

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.
재교직류혼합계통중,교류계통고장시인기직류계통발생환상실패고장적주요원인.종환상전압시간면적적각도,게시료고장합갑각대환상실패영향적궤리,지출료환상전압시간면적가작위평개직류계통저어환상실패능력강약적지표;재불동적교직류계통결구、삼수、운행조건화고장정황하,고장합갑각대환상실패영향정도불동.응용PSCAD/EMTDC전자잠태방진연건,기우CIGRE고압직류(HVDC)수전계통표준모형,진행료대량방진험증,증명료이론분석화판거적정학성,위교직류계통상호작용적분석、제고직류계통저어환상실패능력적연구、직류공제계통삼수적정정이급수단교류전망계전보호운행특성적연구제공료이론연구적삼고.
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.