计及双馈风力发电机内部等值电路的电力系统随机潮流计算

The Probabilistic Load Flow Computation Based on the Steady-State Equivalent Circuit of DFIG

研究了含变速恒频双馈式发电机的风电场接入系统后对电压质量的影响,在双馈式发电机简化等值电路的基础上建立了风电场的确定性潮流模型,建立了风力发电机的随机分析模型,并在这二者的基础上运用基于半不变量法的随机潮流进行计算。算例结果表明,风电场接入系统后,对系统中各节点的电压质量均产生影响,其中风电场节点的电压越限概率最高,对非风电场节点,其电压越限概率与其基准电压值及距风电场节点电气距离远近有关。

This paper studies the impact on voltage quality which is produced by wind farms connected to power system.The deterministic load flow model based on the simplified steady-state equivalent circuit of doubly fed induction generator(DFIG) and the probabilistic analysis model of wind farms are presented,then combining with the cumulants method to implement the probabilistic load flow computation.Test results show that the wind farm connected to power system will have impacts on the bus voltage quality,wind farm has the highest voltage overshoot probability,and the voltage overshoot probability of non-wind farm nodes relates to its base voltage and the electrical distance to the wind farm.