Volume 40: Energy Transitions toward Carbon Neutrality: Part III

Research on Optimal Configuration of Energy Storage Capacity Considering High Proportion of Stable Photovoltaic Consumption Jingwen Cai, Xinxue Zhang, Jie Shi,Yue Zhou, Yanni Zhang, Jie Gao, Guangbin Duan

Abstract

To satisfy the requirements of the renewable energy systems’ construction and development, as well as reducing the challenge got from large-scale renewable energy integration, this paper made some contributions based on a hydropower-photovoltaic (PV)- storage system (HPSS). The capacity ratio of storage system, hydropower and PV, is optimized aiming to smoothly utilize the renewable power output.
First of all, two application scenarios are created. One scenario is focusing on the power output smoothing effort during the piecewised time durations, which is defined as Step Output Power Scenario (SOPS) in this paper; the other scenario is power output shaving in high-frequency segment based on full-time duration. It is defined as Smooth Out the Power Fluctuation Scenario (SOPFS) in this paper. Finally, based on the above two scenarios, multi-objective energy storage capacity optimization is proposed. In addition, the integration value of each generation scheduling period in SOPS is optimized.
The measured data from hydro-PV power stations in Lancang River Energy Base is applied, which shows that the proposed method can effectively alleviate the stochastic fluctuations of the renewable energy power output. What’s more, compared with the stand-alone PV system, the integration percentage of renewable energy increased by 21.45%. The HPSS which utilizes energy storage units with capacity of 1,500 MWh is more economical than the stand-alone power generation system.

Keywords photovoltaic integration, SPOS, SOPFS, NSGA-II, energy storage capacity optimization, LCC