Abstract: To solve the problems of high curtailment rates of RESs, unstable outputs and low financial performance call for more flexible dispatch method. A coordinated dispatch method for the hybrid energy storages system to enhance financial performance and reduce carbon emissions is proposed in this paper. The proposed method fully utilized the dynamic response capabilities and capacity characteristics of different energy storages. The hydrogen storage system (HSS) operates for the high power demand with low power fluctuation, whereas the battery storage system (BSS) is utilized for the low power demand with high power fluctuation. The gas storage system (GSS) improves the flexibility of the hybrid energy storage, and operates for the power balance of the energy system. The uncertainties of wind turbines (WTs) output, photovoltaics(PVs) output, local power demand and electricity price are fully considered. At the cross-seasonal decision stage, the state of charges of HSS and GSS are determined based on the typical seasonal predicted data. At the daily decision stage, the power of all energy storages is scheduled according to daily prediction data. At the real-time decision stage, the WTs output, PVs output and the tie-line power are determined based on the short-leading-time predictions of uncertainties. The numerical results show that the proposed method effectively reduces the curtailment rate of RESs and improves the financial performance of the energy system.

Key words: parks with high penetration of renewable energy sources, hybrid energy storages system, energy-power cross-seasonal dispatch, multi-timescale coordinated operation, stochastic optimization, carbon trading