含光伏电站的输电网不对称故障分析方法  

A grid asymmetric fault analysis method for photovoltaic power station

作　　者：许崇新[1] 焦彦军[1] 张旭[1] 

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003

出　　处：《电测与仪表》2016年第4期20-24,共5页Electrical Measurement & Instrumentation

摘　　要：根据国内最新光伏能源并网规程的要求提出了一种新的光伏并网逆变器低电压穿越运行控制策略,当系统发生严重故障时,优先输出尽可能大的无功电流,以为电网提供较大的无功支撑;而当系统发生非严重性故障时,可同时保证光伏电站的最大有功输出及其对系统的无功支撑。在此基础上,建立了光伏电站受并网点电压和当前时刻所捕捉最大有功功率共同控制的受控电流源模型,并进一步研究了含大型并网光伏电站的输电网不对称故障分析理论和方法,利用对称分量法建立了不对称故障电路方程,提出了基于试根法的计算机求解方案。最后,通过算例计算与仿真设计,验证了理论分析的可行性与有效性。According to the latest regulation for for inverter low voltage ride through is presented tive current outputted priority as large as possib] grid-connected photovohaic system, a new operating control strategy in this paper. When the system happened to serious faults, the reac- le, in order to provide the grid larger reactive power support. When slight fauh occurs to system, photovoltaic power can output maximum active power, and it can provide enough reactive power support at the same time. On this basis, a controlled current source model of the photovoltaic power station which is controlled by grid-connected joint voltage and timely maximum active power is established. This paper propo- ses an accurate theoretical analysis and method for grid fault when it is connected with large scale photovohaic power stations, and then power fault equation and its solution method are introduced. Finally, the example calculation and simulation design verify the feasibility and correctness of the theoretical analvsis.

关 键 词：大型光伏电站 低电压穿越 输电网 不对称故障 故障分析方法 

分 类 号：TM711[电气工程—电力系统及自动化]