Inverse Proportion Technique Based Scheduling Strategy for Energy Storage System Considering Load Demand Differences

The energy storage system (ESS) as a demand-side management (DSM) resource can effectively smooth the load power fluctuation of a power system. However, designing a more reasonable ESS operational strategy will be a prerequisite before incorporating the energy storage device into DSM. As different load levels have different demands for the real-time charge-discharge power of an ESS, this paper proposes a heuristic ESS operation scheduling strategy which can take into account the electrical load demand differences. In this paper, firstly, two demand degree concepts for charging power and discharging power are defined to describe the differentiated ESS demand under the condition of different electrical load levels. Secondly, an inverse proportion technique based ESS scheduling strategy, with the consideration of the load demand difference, is proposed in this paper. Thirdly, some evaluating indices are defined in this paper for describing the influence of the proposed strategy on the smoothing degree of the daily load curve. Finally, several case studies are designed to verify the validity and correctness of the proposed technique, and the results show that the proposed technique can effectively smooth the load curve and improve the ability of peak shaving and valley filling.