摘要
考虑到未来一段时期传统火电机组依旧是主要的灵活性供给源,文章提出一种充分反映现有火电机群固有运行灵活性的定量评价方法。固有运行灵活性为火电机群自身通过爬坡或者改变开机组合来平衡负荷波动的能力,只与技术参数和负荷波动范围有关,与系统的运行方式无关。首先,在单台机组灵活调节特性的基础上,对多台机组构成的机群进行离散组合分析,获得机群层面的灵活调节参数。其次,由于开机状态的离散性,机群出力区间也是离散的,基于这一离散出力特征提出反映机群不同时间尺度的固有运行灵活性评价指标,并采用机组最小启停时间分类聚集的方法减少模型求解的计算量,形成'聚集-分段-交叉-评估'四阶段的指标求解方法。最后,模型的有效性和正确性通过数值算例进行验证,并对提出的评价方法进行了灵敏度分析。结果表明,火电机群固有运行灵活性与其自身的离散出力特征和承担的负荷区间有密切关系。
Considering that traditional thermal power units are still the main flexible resources in the future,this paper proposes a quantitative evaluation method that fully reflects the inherent operational flexibility of the existing thermal power fleet.The inherent operational flexibility defined here is the ability to balance load fluctuations by ramping or changing commitment of the fleet,only being related to the technical parameters and load fluctuation range,regardless of the operating mode of the system.Firstly,the paper analyzes the discrete combination characters of the thermal power fleet and obtains regulating parameters of the fleet on the basis of flexible parameters of single unit.Secondly,using the discrete output characteristics of the fleet,the evaluation model reflecting different time scales of the fleet’s inherent operational flexibility is proposed.In addition,the model is solved by using the minimum start-stop time classification and aggregation method.The calculation method consists of about four stages namely'aggregation-segmentation-crossover-evaluation'.Finally,the validity and correctness of the model are verified by numerical examples,and the sensitivity analysis of the proposed evaluation method is carried out.The results showthat the inherent operational flexibility of the thermal power unit is closely related to its discrete output characteristics and the load range.
作者
刘教民
郭通
徐姗姗
李永刚
高亚静
LIU Jiaomin;GUO Tong;XU Shanshan;LI Yonggang;GAO Yajing(Department of Electrical Engineering,North China Electric Power University,Baoding 071003,Hebei Province,China;Technical and Economic Consulting Center of Electricity Power Construction,China Electricity Council,Beijing 100761,China)
出处
《电力建设》
北大核心
2019年第6期65-73,共9页
Electric Power Construction
基金
国家自然科学基金项目(51607068)
中央高校基本科研业务费专项资金资助项目(2017XS114)~~
关键词
固有运行灵活性
量化评价
离散出力特征
机组分类聚集
inherent operational flexibility
quantitative evaluation
discrete output characteristics
units’classification and aggregation
