微电网跟踪调度计划双层双时间尺度实时控制策略

为了提升微电网跟踪调度计划的能力,并降低分布式电源和负荷的功率波动对跟踪效果的影响,提出一种利用由超级电容和电池储能组成的混合储能系统跟踪调度计划的双层双时间尺度实时控制策略。上层基于模型预测控制方法建立日内滚动优化模型,结合分布式电源和负荷的超短期功率预测结果,综合考虑一段时域内的跟踪偏差及混合储能系统的功率和荷电状态对跟踪调度计划进行滚动优化;下层在上层优化结果的基础上,采用基于荷电状态的混合储能系统实时控制策略对超级电容和电池储能的实时功率进行协调分配,进一步降低分布式电源和负荷的实时功率波动对跟踪效果的影响。通过仿真算例对所提控制策略进行验证,结果表明:所提策略不但实现了良好的实时跟踪调度计划的控制效果,而且优化了超级电容和电池储能的荷电状态。

Two-layer double-time scale real-time control strategy of microgrid for tracking scheduling plan

In order to enhance the microgrid’s ability of tracking scheduling plan and reduce the impact of power fluctuations of distributed generations and loads on the tracking effect,a two-layer double-time scale real-time control strategy is proposed to track the scheduling plan by utilizing the HESS(Hybrid Energy Storage System)composed of SC(SuperCapacitor)and BS(Battery Storage).In the upper layer,the intraday rolling optimization model is established based on model predictive control.Combined with the ultrashort term power prediction results of distributed generations and loads,the tracking scheduling plan rolling optimization is carried out by comprehensively considering the tracking deviation and the power and SOC(State Of Charge)of HESS in a period of time.On the basis of the optimization results of upper layer,in the lower layer,the real-time control strategy of HESS based on SOC is applied to allocate the realtime power of SC and BS coordinately,so as to further reduce the impact of real-time power fluctuations of distributed generations and loads on tracking effect.A simulation example is given to verify the proposed control strategy.The results show that the proposed strategy not only achieves good control effect of real-time tracking scheduling plan,but also optimizes the SOC of SC and BS.