基于系统有功网损-风速灵敏度的双馈机风电场并网位置研究

Integration Point of Doubly-Fed Induction Generator Wind Farm Based on Active Power Loss and Wind Speed Sensitivity

关于风电并网对网损影响的分析,有助于风电系统安全经济运行,但是现有网损灵敏度指标,不能直接反映风速波动影响。在最大功率点跟踪(maximum power point tracking,MPPT)方式下,考虑双馈感应发电机(doubly-fed induction generator,DFIG)内部损耗时,有功出力与定子电压有关,在潮流求解前未知。基于并网DFIG潮流模型,拓展网损灵敏度算法,提出电网有功网损对风速的灵敏度模型,以反映有功网损受风速影响及趋势。量化DFIG不同无功控制方式对网损及风速灵敏度的影响。考虑风速概率区间分布,综合分析灵敏度结果对风电场选址和双馈感应风电机组无功控制方式的辅助参考价值。算例结果证明了所提灵敏度模型的可行性和正确性。

Research on the impact of w ind pow er integration on transmission loss is beneficial to the safe and economic operation of w ind pow er system. How ever,the existing sensitivity index of transmission loss cannot directly reflect the influence of w ind speed fluctuation. Under the maximum pow er point tracking（ M PPT） strategy,active pow er output of doubly-fed induction generator（ DFIG） is dependent on the stator voltage,and unknow n before pow er flow solution due to its pow er loss. Based on pow er flow model of DFIGs,transmission loss sensitivity model w as extended to propose new model for the sensitivity of active pow er loss to w ind speed,w hich could reflect the influence of w ind speed on active pow er loss and its tendency. The influence of var control modes for DFIGs on transmission loss and w ind speed sensitivity w as quantified. With considering w ind speed probability interval distribution,the auxiliary criterions of sensitivity results on the location of w ind farm and the var control modes of DFIGs w ere compositely analyzed. The results validate the feasibility and accuracy of the proposed sensitivity model.