考虑风速随机性的风电-抽水蓄能微网一次调频方法

The Primary Frequency Regulation Method of Wind Power and Pumped Storage in the Microgrid Considering Random Wind Speed

风电主导的微电网系统惯量低,对负荷频率控制的快速性和稳定性产生负面影响。为此,提出一种考虑风速随机性的风电与抽水蓄能协同控制方法。首先,通过对风机次优功率跟踪(optimized power point tracking,OPPT)惯性控制方法在电网频率调节时受风速影响机理的分析,制定风机进行微网一次调频时的风速整定规则;然后,在获取风机参与调频整定风速区间的基础上,根据风机参与状态,设计抽水蓄能机组控制方式,并对其控制器参数进行动态调整以适应风速的不确定性,确保调频效果最佳。通过仿真分析,验证所提方法不仅能充分挖掘风机的调频潜力,而且能提高微网调频的完备性。

The low inertia of the microgrid system dominated by wind power has a negative impact on rapidity and stability of load frequency control. Therefore,considering the randomness of wind speed,a cooperative control method of wind power and pumped storage is proposed in this paper. Firstly,based on the influencing mechanism analyzing of the inertia control method of Optimized Power Point Tracking(OPPT)affected by the wind speed in frequency regulation,the wind speed setting rules for the primary frequency regulation of the microgrid are formulated. Secondly,based on the wind speed range of the wind turbine participating in frequency regulation,the control method of the pumped storage unit is designed according to the state of the wind turbine. In addition,the controller parameters are dynamically adjusted to adapt to the uncertainty of wind speed to ensure the best frequency regulation effect. Finally,through simulation analysis,it is verified that the proposed method can not only fully exploit the frequency regulation potential of the wind turbine,but also improve the completeness of the microgrid frequency regulation.