The renewable energy is gradually transited into the main power supply and inter-provincial and inter-regional power exchange,thus characterizing the power supply capability of wide-area renewable energy systems is of significant importance for ensuring reliable power supply.Energy storage can effectively mitigate the volatility of renewable and en-hance their power supply capability.Capacity credit(CC)serves as a crucial index for characterizing power supply capability of renewable and storage.Therefore,this paper proposes a multi-temporal and multi-spatial CC evaluation framework and calculation method for inter-provincial and inter-regional wind-photovoltaic-storage systems.The CC evaluation is extended to short-term operational,medium-term operational,and planning time scales,so as to better sup-port the power supply requirements in key scenarios.Furthermore,the proposed method is investigated for wind-photovoltaic farms,provincial grids,and inter-regional grids,enabling the characterization of power supply capabil-ity for multi-area wind-photovoltaic-storage.Additionally,an accelerating simulation algorithm considering temporal and spatial dimensions for CC assessment is proposed to enhance calculation efficiency in such systems.Case studies on the RTS-GMLC system verify the validation and efficiency of the proposed method.The results indicate that key scenarios with peak hours have a significant impact on the CC of renewable and storage systems,and the multi-area complementa-rity and storage integration can effectively enhance the CC of renewable energy.
关键词
多时空尺度/容量置信度/风光储系统/跨省跨区/可靠性评估/供电能力
Key words
multiple temporal-spatial scales/capacity credit/wind-photovoltaic-storage systems/inter-provincial and inter-regional/reliability assessment/power supply capability
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