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arXiv 2409.05086math.OCcs.SYeess.SY
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离网可再生能源电转氢系统中基于多时间尺度能源管理的网侧型储能最优容量探索

Exploring the Optimal Size of Grid-forming Energy Storage in an Off-grid Renewable P2H System under Multi-timescale Energy Management

College of Electrical Engineering, Sichuan University(四川大学电气工程学院);Department of Electrical Engineering, Tsinghua University(清华大学电机工程系)

Jie Zhu, Yiwei Qiu, Yangjun Zeng, Yi Zhou, Shi Chen, Tianlei Zang, Buxiang Zhou, Zhipeng Yu, Jin Lin

AI总结:

本文针对离网可再生能源电转氢系统,提出多时间尺度能源管理框架,经迭代搜索确定最优网侧型电池储能容量,案例研究及敏感性分析给出相关参数建议以降低成本。

摘要:

utility级离网可再生能源电转氢系统(OReP2HS)通常包含光伏电站、风力涡轮机、电解槽(EL)和电池储能系统(BESS),需至少一个组件(通常为BESS)具备网侧型能力,以提供频率和电压参考并通过暂态功率支撑对其进行调节。然而,现有基于5分钟或小时级分辨率能源管理策略(EMS)设计的OReP2HS无法捕捉快速暂态过程,可能低估确保足够网侧型能力所需的BESS容量。本文首先提出一种多时间尺度EMS框架,涵盖电力系统暂态行为、秒级EL负荷调整及分钟级日内调度,以协调可再生能源功率、BESS和EL。随后,采用基于高保真仿真的迭代搜索流程,确定满足网侧型、8760小时长期能量平衡及应急支撑要求的高性价比BESS容量。基于中国内蒙古某规划OReP2HS项目的案例研究表明,所提EMS的基准案例氢平准化度电成本(LCOH)为33.212元/千克,其中BESS的资本支出(CAPEX)占总投资的17.83%;最优BESS容量为额定小时级可再生能源出力的13.6%,年衰减率为4.87%。敏感性分析显示,将电解槽负荷调整时间步长从90秒降至5秒、其 ramp 限制从额定功率每秒1%提升至10%时,BESS容量降低53.57%,LCOH降至25.458元/千克。综合考虑utility级具备快速负荷调节能力的电解槽的设计与制造成本,建议负荷调整时间步长为5至10秒,ramp限制为额定功率每秒4%至6%。

英文摘要:

Utility-scale off-grid renewable power-to-hydrogen systems (OReP2HS), typically comprising photovoltaic plants, wind turbines, electrolyzers (ELs), and battery energy storage system (BESS), requires at least one component, generally the BESS, working with grid-forming ability to provide frequency and voltage references and regulate them through transient power support. However, existing designs of OReP2HS based on the energy management strategies (EMSs) with 5-min or hourly resolution fail to capture fast transients and may underestimate the BESS size required to ensure adequate grid-forming ability. This paper first proposes a framework of multi-timescale EMS covers from those for power system transient behaviors to second-level EL load adjustments and minute-level intra-day scheduling to coordinate renewable power, BESS, and ELs. Then, an iterative search procedure based on high-fidelity simulation is employed to determine the cost-effective BESS size that satisfies grid-forming, long-term energy balancing over 8760 hours, and emergency support requirements. Case studies based on a planned OReP2HS project in Inner Mongolia, China, show that the proposed EMS yields a base-case LCOH of 33.212 CNY/kg, with CAPEX of BESS accounting for 17.83% of total investment. The optimal BESS capacity represents 13.6% of the rated hourly renewable output and shows a yearly degradation of 4.87%. Sensitivity analysis reveals that reducing the electrolytic load adjustment time step from 90 to 5 seconds and increasing its ramping limit from 1% to 10% rated power per second, the BESS size decreases by 53.57%, and the LCOH decreases to 25.458 CNY/kg. Considering the cost of designing and manufacturing utility-scale ELs with fast load regulation capability, a load adjustment time step of 5 to 10 seconds and a ramping limit of 4-6% rated power per second are recommended.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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