Evaluation for the Effects of EESS on Renewable Energy Utilization and Load Supply

Under the background of the rapid growth of the power supply and the load demand, the backwardness of the grid makes the heavy load of transmission and transformation equipment, which causes the network congestion more and more common. Therefore, the limited adjustment capability of conventional generation and network congestion causes the increase of renewable energy curtailment, which will hinder the development of renewable energy. Furthermore, both the network congestion and the rapidly growing load demand result in load shedding to a certain extent. In order to solve these problems, this paper uses the electrochemical energy storage system (EESS) on the grid side to alleviate the network congestion caused by the overload of transmission and transformation equipment. This paper uses the power systems operation simulation method which is based on the long-term security-constrained unit commitment (LTSCUC) to precisely simulate the operation of EESS in power systems. Besides, this paper separately proposes two energy storage location schemes for increasing renewable energy utilization and decreasing load shedding. Finally, through data statistics and data processing of the improved ROTS case results, the advantages of the two location schemes under the specific needs are verified.