Abstract
In this paper, a new operation mode is proposed for energy storage, based on which an improved semi-centralized mechanism is proposed for energy storage to participate in the day-ahead energy market. The new operation mode, namely the flexible state-of-energy (SOE) mode, is proposed based on the previous fixed SOE mode, under which the final SOE of energy storage at the end of the last period of the scheduling horizon is no more limited to a predefined value. Accordingly, the value-of-SOE curve is introduced to quantify the deviation cost of the final SOE from the predefined value. Under the proposed market mechanism, energy storage submits to the system operator the unit charging and discharging cost and the value-of-SOE curve. The system operator dispatches the charging and discharging power of energy storage according to the data submitted and system operation. A comparative analysis is conducted in the case studies, and results demonstrate that the proposed mechanism is efficient in further realizing the flexibility potential of energy storage and reducing the total cost of power system.
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