交直流系统中三相重合时序对功率倒向的影响  

Influence of Three-Phase Reclosure Sequence on Power Converse in AC/DC System

作　　者：孙士云[1] 安德超 韩军强[1] 陈春敏[1] 孙德娟[1] 

机构地区：[1]昆明理工大学电力工程学院,云南昆明650500

出　　处：《昆明理工大学学报（自然科学版）》2017年第3期66-71,共6页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(51367009;50847043)

摘　　要：发现交直流系统中三相重合时序对功率倒向有较大影响.建立交直流系统模型,在交流输电线路发生对称性故障时,推导出不同三相重合时序下健全线路两端电流电压的相位关系表达式.据此,揭示电压、电流之间的相位关系随故障距离、整流及逆变侧系统电抗、直流系统等值阻抗和两侧电源相角的变化规律.利用PSD-BPA和MATLAB在两区域交直流系统中验证了所述模型和方法的正确性,并得出减小交直流系统健全线路方向保护误动风险的最佳重合时序方案.The significant effect of three - phase reclosure sequence on power converse in AC/DC system is dis- covered. Based on an established AC/DC system model, the expression of the phase between voltage and current on both sides of the perfect line are deduced under different reclosure sequences when three - phase faults occur. Hereby, the variation laws are analyzed on the phase between measured voltage and current along with fault dis- tance, impedance both on rectifier side and inverter side, the equivalent impedance of DC systems and angle be- tween the sources at two terminals. Based on this, the best reclosure sequence to decrease the maloperation of the direction protection is obtained and its correctness is verified in two - area AC/DC system by utilizing the software of PSD- BPA and MATLAB.

关 键 词：三相重合时序 功率倒向 交直流系统 

分 类 号：TM76[电气工程—电力系统及自动化]