An Energy Storage Capacity Configuration Method for a Provincial Power System Considering Flexible Adjustment of the Tie-Line

IF 3 4区工程技术 Q3 ENERGY & FUELS

Energies Pub Date : 2024-01-04 DOI:10.3390/en17010270

Bing Sun, Zheng Zhang, Jing Hu, Zihan Meng, Bibin Huang, Nana Li

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Abstract

A high proportion of renewable generators are widely integrated into the power system. Due to the output uncertainty of renewable energy, the demand for flexible resources is greatly increased in order to meet the real-time balance of the system. But the investment cost of flexible resources, such as energy storage equipment, is still high. It is necessary to propose a method for determining the capacity of energy storage scientifically. An optimization and planning method of energy storage capacity is proposed. It is characterized by determining the optimal capacity of energy storage by carrying out 8760 hours of time series simulation for a provincial power grid with energy storage. Firstly, the current situation of power supply and demand for provincial power grids is analyzed. The difficulty of realizing a power balance at different time scales is analyzed. Then, the source load balancing solutions at different time scales are proposed. The difficulty of a long-term power balance can be alleviated by flexibly adjusting the power on the tie-line of the provincial power grid. And the difficulty of a short-term power balance can be met through energy storage. In addition, an optimal planning model of an energy storage system is established with the power supply cost as the objective function. The optimal capacity of the energy storage is determined by comparing the objective function of different planning schemes. Finally, a case study is carried out. It is found that flexible adjustment of interprovincial interconnection lines can reduce the maximum demand for electricity from 8.439 billion kWh to 2.299 billion kWh. At the same time, the curtailment ratio of renewable electricity can be decreased from 12.6% to 5.0% by using energy storage. However, the average power supply cost of the system gradually increases from 0.307 CNY/kWh to 0.485 CNY/kWh. It is necessary to fully tap into the various values of energy storage equipment.

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考虑纽带线路灵活调整的省级电力系统储能容量配置方法

电力系统中广泛集成了高比例的可再生能源发电机。由于可再生能源输出的不确定性，为了满足系统的实时平衡，对柔性资源的需求大大增加。但储能设备等柔性资源的投资成本仍然较高。有必要提出一种科学确定储能容量的方法。本文提出了一种储能容量的优化和规划方法。其特点是通过对某省电网进行 8760 小时的储能时间序列仿真，确定储能的最优容量。首先，分析了省级电网的电力供需现状。分析了不同时间尺度下实现电力平衡的难度。然后，提出了不同时间尺度下的源负荷平衡方案。长期电力平衡的难度可以通过灵活调整省级电网的联络线功率来缓解。而短期电力平衡的困难可以通过储能来解决。此外，以供电成本为目标函数，建立了储能系统的优化规划模型。通过比较不同规划方案的目标函数，确定储能的最佳容量。最后，还进行了案例研究。研究发现，灵活调整省际联网线路可将最大电力需求从 84.39 亿千瓦时降至 22.99 亿千瓦时。同时，利用储能技术可将可再生能源电力的削减率从 12.6% 降至 5.0%。但是，系统的平均供电成本将从 0.307 元/千瓦时逐渐增加到 0.485 元/千瓦时。有必要充分挖掘储能设备的各种价值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Energies ENERGY & FUELS-

CiteScore

6.20

自引率

21.90%

发文量

8045

审稿时长

1.9 months

期刊介绍： Energies (ISSN 1996-1073) is an open access journal of related scientific research, technology development and policy and management studies. It publishes reviews, regular research papers, and communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.