电工技术学报  2024, Vol. 39 Issue (20): 6502-6516    DOI: 10.19595/j.cnki.1000-6753.tces.232102
电力系统与综合能源 |
考虑源网储协同配合下的移动式波浪能发电平台并网优化调度
贺玮杰, 冯忠楠, 林湘宁, 魏繁荣, 顾本硕
强电磁工程与新技术国家重点实验室（华中科技大学电气与电子工程学院） 武汉 430074
Grid-Connected Optimization Dispatch of Mobile Wave Energy Power Generation Platform Considering the Coordination of Source, Network and Storage
He Weijie, Feng Zhongnan, Lin Xiangning, Wei Fanrong, Gu Benshuo
State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electric Engineering Huazhong University of Science and Technology Wuhan 430074 China
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摘要 针对含波浪能发电的新型海岛供电模式,存在最大功率控制策略下波浪能发电形态脉冲性强、且利用储能消纳全部功率冲击导致的过大电池寿命损耗问题,因此,提出一种考虑源网储协同配合的移动式波浪能发电平台并网策略。首先,该文构建波浪能发电的数学模型,基于物理机理分析各变量的耦合关系,提出功率灵活控制方法。其次,考虑到波浪能发电冲击与一般阶跃冲击的差异,对微电网频率响应过程进行数学分析,量化评估微电网的极限承受能力。在此基础上,以经济成本最小为目标,考虑微电网系统运行的各类约束条件,建立一种根据微电网需求灵活调制波浪能发电装置功率曲线,利用微电网和储能系统协同消纳功率冲击的海岛微电网日前优化调度模型。最后,通过Gurobi求解器求解模型,并对各类优化调度方案进行对比。结果表明,该文所提模型能有效提升海岛微电网运行的经济性,同时为波浪能的并网提供了一个可行思路。
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贺玮杰
冯忠楠
林湘宁
魏繁荣
顾本硕
关键词 ： 海岛微电网,  波浪能发电,  冲击消纳,  优化调度    
Abstract：As a new type of renewable energy, wave energy power generation output is periodic and impulsive. Since island microgrids in the marine environment lack inertia and rotating backup, meeting the access requirements for periodic and impulsive power supplies is challenging. In real-world application scenarios, wave energy power generation adopts a maximum power control strategy and energy storage to smooth out impacts when connected to the grid. However, traditional strategies ignore the huge charge and discharge loss of battery storage during this process, resulting in the economic costs of the island microgrid. This paper proposes a grid-connected strategy for the wave-energy power generation platform, considering source, grid, and storage coordination. This strategy modulates the power of wave energy power generation from the disturbance source and uses the microgrid and energy storage to jointly absorb the power impact. The simulation results show that the proposed strategy can reduce battery losses and improve grid connection friendliness.
First, a mathematical model for the output power of the hydraulic wave-energy power generation device is constructed. The valve opening power of the device in each generation cycle can be changed to modulate the power curve and improve its impulsive characteristics. Secondly, since the microgrid's ability to absorb power impact is related to the inertia, an island microgrid inertia evaluation model and a post-disturbance frequency response model are established. The difference between the grid-connected disturbance of the wave energy power generation and the general step disturbance is subdivided, and the changing rate of frequency and transient frequency extreme values in the frequency response process are calculated. These two indicators are used to quantify the ultimate bearing capacity of the microgrid. Finally, with the minimum economic cost as the objective function, a global grid-connected dispatch model is established under multiple source, network, and storage constraints. In this model, the energy flow interaction processes of the three sides are flexibly coupled, thereby greatly reducing economic costs.
The simulation with the actual island microgrid data shows that when the wave energy power generation adopts the maximum power point tracking (MPPT) control strategy, the equivalent battery loss is 1 440.6 kW·h, and the maximum power impact is 100 kW. In the flexible control strategy adopted by the wave energy power generation, the equivalent battery loss is 516.2 kW·h, and the maximum power impact is reduced to less than 70 kW. In addition, if the energy storage and microgrid jointly absorb the power impact, the battery loss is only 302.1 kW·h. Movable and high penetration scenarios of wave energy are further simulated to verify the proposed model.
The following conclusions can be drawn. (1) The output power curve of the wave energy power generation using the flexible control strategy is smoother than the MPPT strategy, which greatly reduces the rate loss and charge and discharge loss of energy storage. The wave energy device can also flexibly adjust the impact disturbance when connected to the grid to ensure frequency safety. (2) According to the simulation results, the economic benefits of the global consumption strategy that comprehensively considers the coordination of source, network, and storage are 17.8% higher than the traditional strategy that only uses energy storage. The economy and security of the microgrid operation are further improved if mobility is considered.
Key words： Island microgrid    wave energy generation    shock absorption    optimize scheduling   
收稿日期: 2023-12-19     
PACS: TM732  
基金资助:国家重点研发计划（2022YFE0120400）和国家自然科学基金（U22B20106）资助项目
通讯作者: 冯忠楠 女,1998年生,博士研究生,研究方向为新能源发电。E-mail: fengzhongnan@hust.edu.cn   
作者简介: 贺玮杰 男,2001年生,硕士研究生,研究方向为新能源发电。E-mail: 1071918830@qq.com
引用本文:   
贺玮杰, 冯忠楠, 林湘宁, 魏繁荣, 顾本硕. 考虑源网储协同配合下的移动式波浪能发电平台并网优化调度[J]. 电工技术学报, 2024, 39(20): 6502-6516. He Weijie, Feng Zhongnan, Lin Xiangning, Wei Fanrong, Gu Benshuo. Grid-Connected Optimization Dispatch of Mobile Wave Energy Power Generation Platform Considering the Coordination of Source, Network and Storage. Transactions of China Electrotechnical Society, 2024, 39(20): 6502-6516.
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