电-气-氢混联综合能源配网灵活运行域模型

doi:10.19595/j.cnki.1000-6753.tces.241804

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摘要

高比例新能源并网与管道掺氢为配电网灵活运行带来了巨大挑战。为定量评估配电网运行的灵活性,该文以电-气-氢耦合为载体,提出了一种了电-气-氢混联综合能源配网灵活运行域模型。首先,考虑配电网管道掺氢的准动态运行过程,建立了电-气-氢混联综合能源配网运行模型;其次,考虑光伏预测误差和系统多断面时域耦合特性,提出了考虑管道掺氢的配电网机会约束灵活运行域模型;然后,提出了一种径向自适应重构算法获取灵活运行域边界运行点,并基于运行点构建灵活运行域空间;最后,在由33节点配电网和20节点配气网构成的电-气混联系统中开展测试,基于可视化灵活运行域空间准确、直观地刻画了光伏不确定性和灵活资源调控特性对于配电网灵活调控能力的影响,验证了所提模型的有效性。

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关键词 ：配电网, 掺氢配气网, 灵活性运行域, 机会约束

Abstract：

The integration of high proportions of renewable energy and hydrogen blending in gas pipelines presents significant challenges for the flexible operation of distribution networks. Currently, the operation domain of distribution networks emphasizes the flexibility characterization of active and reactive power in a single time segment, while there is a lack of research focusing on the construction of multi-time segment operation domain models under multi-energy coupling. Furthermore, due to the high-dimensional nonlinearity of the coupled electrical-gas-hydrogen multi-energy flow equations, the analytical methods based on projection approximation are difficult to apply directly to construct the operation domain. Additionally, simulation methods for searching boundary points also suffer from low computational efficiency. To address this, this paper uses electrical-gas-hydrogen coupling as a framework, taking into account the dynamic hydrogen production characteristics of hydrogen generation units and the quasi-dynamic operation processes of the gas network under pipeline hydrogen blending, thereby constructing a flexible operation domain model for integrated electrical-gas-hydrogen energy distribution networks.
Firstly, considering the quasi-dynamic operation process of pipeline hydrogen blending in the distribution network, a coupled electrical-gas-hydrogen integrated energy distribution network operation model was established. Next, taking into account photovoltaic forecasting errors and the multi-cross-section time-domain coupling characteristics of the system, an opportunity-constrained flexible operation domain model for the distribution network with pipeline hydrogen blending was constructed. Then, the radial adaptive reconstruction algorithm was utilized to obtain the boundary operational points of the flexible operation domain, and the flexible operation domain space was constructed based on these points. Finally, tests were conducted within a coupled electrical-gas system composed of a 33-node distribution network and a 20-node gas network, where the visually represented flexible operation domain space accurately and intuitively depicted the impact of photovoltaic uncertainty and flexible resource regulation characteristics on the flexible regulation capability of the distribution network.
Based on the results of the case studies, the following conclusions can be drawn: 1) The multi-time segment flexible operation domain constructed in this paper characterizes the active regulation capability of the distribution network across different time segments, thereby providing a technical reference for multi-period scheduling and rolling optimization of the distribution network, supporting the flexible operation of renewable energy-based distribution networks. 2) The opportunity-constrained operation domain effectively considers the impact of photovoltaic output uncertainty on the flexible operation of the distribution network, revealing that under high confidence levels, the flexible operation space of the distribution network is constrained. The selection of actual confidence levels must comprehensively take into account the accuracy of photovoltaic forecasting and operational risks. 3) The upper limit of hydrogen injection ratios in the gas network pipeline directly affects the flexible operation domain space of the distribution network, with significant differences observed under 2%, 6%, and 10% hydrogen blending ratios. Additionally, the flexible injection of green hydrogen must adequately consider the safe operational constraints of the blended gas network.

Key words： Distribution network Natural gas network with hydrogen injections Flexible operating region Chance-constrained optimization.

收稿日期: 2024-10-16

PACS:

TM73

基金资助:

国家自然科学基金资助项目（52377091）和中国科协青年人才托举工程项目（2021QNRC001）资助

通讯作者: 陈胜男,1990年生,青年教授,研究方向为综合能源系统运行与市场交易、能源系统低碳化转型。E-mail：chensheng2019@hhu.edu.cn

作者简介: 陈明健男,2000年生,硕士研究生,研究方向为绿氢综合能源系统。E-mail：599036409@qq.com

引用本文:

陈胜, 陈明健, 卫志农, 孙国强, 臧海祥. 电-气-氢混联综合能源配网灵活运行域模型[J]. 电工技术学报, 0, (): 20241804-20241804. Chen Sheng, Chen Mingjian, Wei Zhinong, Sun Guoqiang, Zang Haixiang. Flexible Operation Region for Integrated Electric-Gas-Hydrogen Distribution Network. Transactions of China Electrotechnical Society, 0, (): 20241804-20241804.

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