Economic Dispatching Strategy of Double Lead-acid Battery Packs Considering Various Factors
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ORIGINAL ARTICLE
Economic Dispatching Strategy of Double Lead‑acid Battery Packs Considering Various Factors Qingwu Gong1 · Yubo Wang1 Received: 5 August 2020 / Revised: 13 October 2020 / Accepted: 19 October 2020 © The Korean Institute of Electrical Engineers 2020
Abstract In this paper, a new energy storage economic dispatch strategy is proposed. Firstly, the equivalent life of a battery is evaluated based on its discharge of depth, and the optimal operation state of the battery is determined. Then, a mathematical model of double battery packs operation is established, which can make the battery closer to the optimal operation state. According to different demand of power supply, two dispatching strategies are proposed. The first strategy considers the reliability of power supply and maximum wind and photovoltaic energy consumption, and the second strategy considers the life of battery energy storage itself. The simulation operations in IEEE33 bus system. And it results show that the above two strategies can prolong the battery life, reduce the energy storage cost, and bring more benefits to the energy storage system. The second strategy gains more benefits because of more consideration of energy storage itself. Therefore, energy storage equipment, as an auxiliary service equipment, can make the price differentials between purchase and sale of electricity lower. So the price more flexible when it gains profits by purchasing electricity at a low price and selling electricity at a high price. Keywords Energy storage strategy · Depth of discharge ( DoD) · Rain-flow-counting method · Equivalent life · Double battery pack · Optimum operation state
1 Introduction Renewable energy power has the advantages of non-pollution and sustainable use of primary energy, which provides an effective direction for the sustainable development of lowcarbon power [1]. However, renewable energy is random, intermittent and unpredictable, and its large-scale use will inevitably bring many challenges to the operation, debug and control of power system [2]. Therefore, from the point of view of safe and economic operation of power grid, how to improve the controllability of renewable energy power is an urgent problem for renewable energy grid-connected [3]. Energy storage has the characteristics of fast, accurate and large instantaneous throughput. With its large-scale development and large-scale cost reduction, it has gradually become a high-quality auxiliary service resource in automatic generation control of power system [4, 5].
* Yubo Wang [email protected] 1
School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, People’s Republic of China
Battery energy storage system has the advantages of fast response and large-scale possibilities and can shift the time and space of electric energy in the meantime [6]. It is considered to be an effective mean to improve the controllability of intermittent power supply and its grid-connected ability [7]. Energy storage equipment can reduce system operating costs by
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