风-铝联合系统协同频率控制策略研究

Research on Cooperative Frequency Control Strategy with Wind-Aluminum Combination System

对于含有大规模新能源接入的联网型高耗能工业电网,新能源功率波动势必造成联络线功率波动以及额外备用容量费用,不利于工业电网经济运行。为深入挖掘源荷两侧调频资源,基于IEEE标准两区域模型,提出一种考虑风-铝联合的源荷协同频率控制策略。首先,基于自饱和电抗器建立电解铝负荷有功功率消耗与直流电压的耦合关系模型。其次,基于电解铝负荷特性提出一种电解铝参与的电网辅助调频策略。同时考虑风机惯性控制的快速频率响应能力,将电解铝负荷与风电机组调频手段结合,联合参与系统频率调节。最后,仿真验证了所提控制策略能有效抑制孤立电网的频率波动,使电力系统具有更强的抗干扰性和更快的动态响应。

For the interconnected and high energy consumption industrial power grid with large-scale new energy access,the fluctuation of new energy power will inevitably lead to the fluctuation of tie line power and additional standby capacity costs,which is not conducive to the economic operation of the industrial power grid.In order to deeply explore the frequency modulation resources on both sides of the source and load,based on the IEEE standard two-region model,a cooperative frequency control strategy of the source and load considering the wind-aluminum combination is proposed.Firstly,the coupling relationship model between active power consumption and DC voltage of electrolytic aluminum load is established based on self saturating reactor.Secondly,based on the characteristics of electrolytic aluminum load,a power grid auxiliary frequency modulation strategy with electrolytic aluminum participation is proposed.At the same time,considering the fast frequency response ability of the wind turbine inertia control,the electrolytic aluminum load is combined with the wind turbine frequency modulation means to jointly participate in the system frequency regulation.Finally,the simulation results verify that the proposed control strategy can effectively suppress the frequency fluctuations of isolated power grid,and make the power system have stronger anti-interference and faster dynamic response.