计及集电线路和内部损耗的风电场模型分析比较

风电的接入会改变电网原有的潮流分布而对电网电压稳定性产生影响。潮流计算作为风电接入系统研究的基础，为得到其计算结果的准确性而建立风电场稳态模型具有重要的意义。以往的风电场系统潮流计算都是把整个风电场等效为一个风机处理，并没有详细讨论风电场内部的电网结构，潮流计算无法深入到风电场内部。在DigSILENT / PowerFactory中建立了改进的潮流计算模型，充分考虑了由双馈异步发电机组成的大型风电场的集电系统以及风电机组间电缆的功率损耗对稳态潮流计算的影响。

Analysis and Comparison of Wind Farm Models Taking Account of Feeder Cable and Internal Loss

When wind power is integrated to a power grid, the power flow distribution changes, affecting the voltage stability of the grid. As power flow calculation lies as the foundation of research on integration of wind power with power system, modeling the steady-state of wind farm plays a significant role in guaranteeing the accuracy of the calculation. The previous power flow calculation considered the whole wind farm as one equivalent wind power generator, overlooking the grid structure within the wind farm. They therefore failed to include the internal loss of the wind farm. This paper establishes a modified power flow calculation model with DigSILENT / PowerFactory. The method takes a full consideration of both the large wind farm collector system composed of the doubly-fed induction generators and the effects of the cable line power loss among the wind power generators on the steady-state power flow calculation.