面向燃气机组调峰的天然气管网动态安全域
Natural Gas Network Dynamic Security Region for Gas-fired Units Peak Regulation
杜蕙 1林涛 1张效宁 2李君 1李轻言 1付希越1
作者信息
- 1. 武汉大学电气与自动化学院,湖北省 武汉市 430072
- 2. 华北电力大学控制与计算机工程学院,北京市 昌平区 102206
- 折叠
摘要
燃气机组调峰的灵活性有助于提升可再生能源消纳水平,但所造成的管道压力剧烈波动却为天然气管网引入新的安全风险.该文提出一种面向燃气机组调峰的天然气管网动态安全域,以表征满足动态管流安全的燃气机组有功调整量的集合.首先,分析以时域连续的气负荷质量流率作为注入空间的天然气管网动态安全域难以实用化的原因.为此,提出将燃气机组进气口质量流率转化为有功调整量的函数,定义以初始运行点为基准、以各燃气机组有功调整量为注入空间的天然气管网动态安全域.为兼顾计算精度和效率,基于时空正交配置法对管网连续变量进行近似离散,建立安全域边界搜索优化模型.并进一步揭示天然气管网稳态安全域可通过松弛该优化模型中部分约束条件求解得到,为动态安全域的一种退化形式.算例结果表明,所提方法克服天然气管网稳态安全域对于日内安全分析过于乐观的局限性,有助于增强电力-天然气耦合系统的协同态势感知能力.
Abstract
The flexible peak regulation of gas-fired units increases the consumption of renewable energy but the resultant sharp gas-pressure fluctuations introduce new security risks to the natural gas network.This paper proposes a natural gas network dynamic security region to represent a set of peak regulation amounts of gas-fired units that satisfy dynamic pipe flow security constraints.First,impractical reasons for the dynamic security region with time-continuous gas loads'mass flow rates(MFRs)as the injection space are analyzed.To this end,the inlet MFR of each gas-fired unit is converted into a function of the active-power adjustment.And the dynamic security region is constructed by taking the discrete active-power adjustment as the injection space referring to the initial operating point.For balancing computational accuracy and efficiency,the continuous variables in the security region boundary search optimization model are discretized by the space-time orthogonal collocation.The gas network steady-state security region is revealed to be a reduced form of the dynamic security region,for it can be obtained by slacking some constraints in the optimization model.Simulation results show that the proposed method can overcome the over optimism of the gas network steady-state security region for intraday security analysis,thus enhancing coordinated situation awareness of electricity-gas coupling systems.
关键词
新型电力系统/天然气管网/智能发电/燃气机组调峰/安全域/动态管流Key words
new-type power grid/natural gas network/smart generation/gas-fired units peak regulation(GPR)/security region/dynamic pipe flow引用本文复制引用
基金项目
国家自然科学基金联合基金重点支持项目(U2166206)
出版年
2024
国家科技期刊平台
NSTL
万方数据