Optimal Scheduling of Island Microgrid with Seawater-Pumped Storage Station and Renewable Energy

Abstract

The rapid development of renewable energy, represented by wind and photovoltaic, provides a new solution for island power supplies. However, due to the intermittent and random nature of renewable energy, a microgrid needs energy-storage components to stabilize its power supply when coupled with them. The emergence of seawater-pumped storage stations provides a new method to offset the shortage of island power supply. In this study, an optimal scheduling of island microgrid is proposed, which uses seawater-pumped storage station as the energy storage equipment to cooperate with wind, photovoltaic and diesel generator. First, a mathematic formulation of seawater-pumped storage station with renewable energy is presented. Then, to reach the goal of economic dispatch, an optimal scheduling model of island microgrid is established with the consideration of both respective operation constraints and island load requirements. Finally, the effectiveness of the proposed model is verified by an island microgrid over two typical seasons. The simulation results show that the proposed framework not only increases the usage of renewable energy, but also improves the operational reliability and economy of island microgrids.

Optimization Scheduling Strategy for Energy Storage and Cement Load Aggregation Considering Production Constraints

“…Current research on pumped storage mainly focuses on control strategies. According to literature [4], pumped storage power stations change their operating states based on power fluctuation to participate in frequency control together with thermal power units. Literature [5] adjusts the operating rate and planned output power of pumped storage units based on DC voltage fluctuations to reduce the impact of renewable energy output power fluctuations on the AC system.…”