基于负荷重要性和源-荷互补性的离网系统终端电/热/冷负荷投切策略

Research on Power/Heating/Cooling Load Switching Strategy of Off-Grid System Based on Load Importance and Source Load Complementarity

针对如何减少离网系统供需不平衡以及提高能源利用效率的问题,该文提出一种基于负荷重要性和源-荷互补性的离网系统终端电/热/冷负荷投切策略。首先,定义负荷重要性指标以及源-荷互补性指标,并利用熵权法确定综合指标。然后,在此基础上提出基于单时间尺度供能和综合指标的负荷投切策略以及基于多时间尺度供能和综合指标的负荷投切策略。考虑到预测偏差会导致储能荷电状态(SOC)偏离计划值,进而影响负荷投切方案,该文利用基于模型预测控制(MPC)的滚动优化调度方法减少不确定性因素,实时跟踪储能SOC计划值。最后,以某离网系统夏季典型日为算例,验证了所提策略的有效性。

In order to reduce the imbalance between supply and demand of off grid system and improve the efficiency of energy utilization,this paper proposes a strategy based on the importance of load and the complementarity between source and load.Firstly,the importance index of load and the complementarity index of source and load are defined,and the comprehensive index is determined by entropy weight method.On this basis,the load switching strategy based on single time scale energy supply and comprehensive index and the load switching strategy based on multi time scale energy supply and comprehensive index are proposed successively.Considering that the prediction deviation will lead to state of charge(SOC)deviation from the planned value,and then affect the load switching scheme,this paper uses the rolling optimization scheduling method based on model predictive control(MPC)to reduce the uncertainty factors.Finally,this paper takes a typical summer day of an off-grid system as an example to verify the effectiveness of the proposed strategy.