CAJ | 학술논문

随着未来多回大容量高压直流高密度接入交流电网，交直流系统间的相互作用变得更加复杂。基于二阶线性系统的冲击响应模型，阐释直流换相失败后的功率冲击对两区域交流联络线功率波动的影响机制；证明直流换相失败冲击下，两区域互联系统交流联络线功率首摆峰值大小主要取决于直流换相失败的功率跌幅和持续时间、交流互联系统区域振荡模式的振荡频率和阻尼比、区域电网的总惯性常数之比，峰值时刻主要取决于振荡频率；提出直流换相失败冲击下两区域交流联络线功率波动峰值的快速估算公式，并从能量守恒的角度进行了推导印证。通过对简单三区域交直流互联系统的仿真分析和华北—华中—华东互联系统直流换相失败的分析验证了所提方法的有效性。研究结果可为互联电网运行方式的安排和控制措施的制定提供依据。
수착미래다회대용량고압직류고밀도접입교류전망，교직류계통간적상호작용변득경가복잡。기우이계선성계통적충격향응모형，천석직류환상실패후적공솔충격대량구역교류련락선공솔파동적영향궤제；증명직류환상실패충격하，량구역호련계통교류련락선공솔수파봉치대소주요취결우직류환상실패적공솔질폭화지속시간、교류호련계통구역진탕모식적진탕빈솔화조니비、구역전망적총관성상수지비，봉치시각주요취결우진탕빈솔；제출직류환상실패충격하량구역교류련락선공솔파동봉치적쾌속고산공식，병종능량수항적각도진행료추도인증。통과대간단삼구역교직류호련계통적방진분석화화북—화중—화동호련계통직류환상실패적분석험증료소제방법적유효성。연구결과가위호련전망운행방식적안배화공제조시적제정제공의거。
With large capacity high-voltage direct current (HVDC) transmission lines densely connecting to AC power grid in the near future, interactions between AC and DC systems become much more complicated. Based on the impulse response model of second order linear system, the mechanism of power oscillation on AC tie-line caused by HVDC commutation failure was clarified. It was proved that the peak value of the power oscillation is mainly determined by the power loss and time interval during HVDC commutation failure, the frequency and damping ratio of dominant area oscillation mode, and the ratio of total inertia constants of the two area power systems, and meanwhile the peak time is mainly determined by the oscillation frequency. Fast algorithms for peak value calculation of power oscillation on AC tie-line after HVDC commutation failure were proposed and confirmed by using the energy conservation principle as well. Finally, the correctness and effectiveness of the algorithms were verified by simulation analysis of a simple three-area AC/DC interconnected power system and practical HVDC commutation failure analysis of North China-Central China-East China interconnected power system. It provides basis for arranging operating schemes and control measures of interconnected power systems.