Study on distributed renewable energy generation aggregation application based on energy storage

Abstract

As large amounts of distributed renewable energy generation (DREG) replace conventional generating units on the grid, the tension between the supply lack of flexible resources and the increased demand for flexible resources on the grid intensifies. To address this issue, this paper focuses on distributed renewable energy generation aggregation (DREGA) applications based on energy storage systems (ESS). Considering the interconnection and supply–demand coupling between generation and consumption in the grid, ESS is used to flexibly regulate the flow of electrical energy between producers and consumers in DREGA. A pricing methodology that takes into account aggregation differences and real-time changes based on supply and demand is developed. This method mobilizes resources within the aggregator to help the network operator balance supply and demand through price incentives. Electricity is shared directly between producers and consumers within the aggregation, in addition to indirectly shared through ESS. It improves the self-consumption of renewable energy and the self-supply rate of users from the perspective of aggregators. The validity of the proposed method is proven by case study results.

Keywords

• Aggregator
• Energy storage system
• Differentiated electricity prices
• Producers and consumers
• Dispatchable resources