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| Fine-Grained Dispatching of Isolated Microgrids Under Flexible Access of Wave Energy hydraulic Power Generation System |
| Li Feiyu1, Gu Yanxun2, Wei Fanrong1, Ou Zhongxi2, Lin Xiangning1 |
1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China;
2. Guangdong Power Grid Corporation Zhuhai Power Supply Bureau Zhuhai 519000 China |
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Abstract Currently, countries around the world are paying more attention to the development of ocean energy. However, wave energy has a large fluctuation in power output on short time scales, which makes it difficult to capture wave energy. Therefore, wave energy hydraulic power generation system generally adopts the control strategy of maximum power tracking, and the hydraulic power generation system needs to experience a certain time of energy storage before discharge, resulting in its power output curve showing the characteristics of short discharge time and high discharge power. According to the relevant research, the capacity loss of the battery will be several times higher than the normal operation mode when facing such a power shock. Therefore, the efficient energy conversion comes at the cost of a significant increase in battery losses. In this context, it is debatable whether choosing the maximum efficiency tracking strategy is necessarily economically optimal.
In this paper, for the islanded microgrid system with flexible wave energy access, firstly, the working principle of wave energy device is analyzed in depth and the mathematical model of wave energy hydraulic system is built; based on this, the economic optimality in the dispatching cycle is the goal, and a wave energy flexible access under The fine-grained dispatching model of the islanded microgrid with flexible wave energy access is established and solved by GUROBI. The simulation results show that the wave energy dispatching proposed in this paper is different from the maximum efficiency conversion control strategy, which makes a trade-off between the pursuit of conversion efficiency and the fast charging loss of energy storage, and chooses to discard part of the wave energy conversion efficiency to obtain a more economical dispatching scheme for islanded microgrids with wave energy. The power discarded in one dispatching cycle is 287 kW·h, and the cost of energy storage less loss in one dispatching cycle is 686 RMB. To highlight the economy of the dispatching strategy proposed in this paper, the following control schemes are designed: Scheme 1: the fine-grained dispatching strategy of the islanded microgrid based on the power exchange mode proposed in this paper; Scheme 2: the wave energy adopts the conventional maximum efficiency control strategy, and the other remains the same as Scheme 1; Scheme 3: the submarine cable is used to build the transmission channel between the offshore wave energy device and the islanded microgrid. The annual comprehensive cost of the proposed scheme in this paper is 6.048 million yuan, respectively, which is 3.4% and 13.3% more economical compared with scheme 2 and scheme 3.
Based on the above results, the following conclusions are drawn that: (1) the isolated island microgrid containing floating wave energy devices has better economy by using ship-for-power mode to supply power; (2) the isolated island microgrid satisfies the real-time power balance of source-load-storage, and the ship-for-power mode realizes the dynamic balance of island energy; (3) the fine-grained scheduling strategy of the hydraulic power generation system regulates the speed and accumulator pressure of the wave energy hydraulic power generation system, compared with the maximum conversion efficiency control strategy The economy is improved by 3.4%.
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Received: 12 April 2022
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2023, Vol. 38 
