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。
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 ener
作者
贺玮杰
冯忠楠
林湘宁
魏繁荣
顾本硕
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)
出处
《电工技术学报》
EI
CSCD
北大核心
2024年第20期6502-6516,共15页
Transactions of China Electrotechnical Society
基金
国家重点研发计划(2022YFE0120400)
国家自然科学基金(U22B20106)资助项目。
关键词
海岛微电网
波浪能发电
冲击消纳
优化调度
Island microgrid
wave energy generation
shock absorption
optimize scheduling
