基于有功不平衡指标的储能快速调频方法

因主流变速风电机组有功控制一般不主动参与频率调节，大规模风电并网对电力系统快速调频提出了挑战。储能系统具备有功功率快速响应优势，可改善系统动态频率响应特性，该文提出了一种基于有功不平衡指标的储能快速调频方法。首先，定义了在频率跌落阶段和恢复阶段系统有功不平衡指标。其次，设计了自适应模糊逻辑控制策略，依据系统有功不平衡指标和频率偏差动态调整储能系统在频率跌落阶段和恢复阶段的有功出力。最后，通过算例分析验证了所提出的储能快速调频控制方法的有效性，与常规比例微分（proportional differential，PD）控制方法相比，可减少储能系统容量需求，且对不同工况具有较好的灵活性和适应性。

Fast Frequency Regulation Method Based on Unbalanced Power Index Using Energy Storage System

As most variable speed wind power generators scarcely respond to frequency variation actively, large-scale wind power integration brings challenge to the fast frequency regulation of power system. With the advantage of fast response, energy storage system （ESS） can be used to improve dynamic frequency response of power system. A fast frequency regulation method based on unbalanced power index using ESS is proposed in this paper. Firstly, unbalanced power indices in the stages of frequency fall and recovery are defined. Secondly, an adaptive fuzzy logic control strategy is designed to adjust power output of ESS in the stages of frequency fall and recovery according to unbalanced power index and frequency deviation. Finally, compared to proportional differential （PD） control, the proposed method can reduce capacity demand of ESS and be more flexible and adaptable to different operating conditions, which is verified by case studies.