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Optimal Control Strategy for Energy Storage Considering Wind Farm Scheduling Plan and Modulation Frequency Limitation under Electricity Market Environment |
Li Junhui, Hou Tao, Mu Gang, Yan Gangui, Li Cuiping |
Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin 132012 China |
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Abstract The intermittency of wind power not only makes it difficult for the wind farm to respond to the day-ahead scheduling plan(DASP) accurately, but also aggravates the frequency fluctuation of power system. In order to improve the schedulability of wind power and the security of power system frequency, this paper taking day-ahead scheduling as an example constructed the formation method of the DASP and the modulation frequency limitation of the power system. Based on this, a control strategy of energy storage was proposed which combined energy storage assisting wind farm tracking the DASP with participating in frequency modulation. Then, a wind-energy storage(WES) operation model was established under the electricity market environment to maximize the profit of the WES station. The combined output power constraint of WES station and the frequency security constraint which formed by the proposed strategy were considered in the model. This model can calculate the optimal output power of the energy storage which are used to tracking DASP and participating in frequency modulation. Simulation verification was carried out based on actual measurement data. Test results show that the proposed strategy can improve the ability of wind farm tracking DASP and the security of frequency. At the same time, it also has good economic benefits.
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Received: 19 July 2020
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