高比例可再生能源电网消纳及调峰灵活性评估

Flexibility evaluation of grid consumption and peak shaving of power system with high proportion renewable energy

为建立一种新型的电力系统灵活性评估方法,实现高比例可再生能源电网的消纳及调峰灵活性的综合量化分析,在电力系统灵活性理论的基础上,将可再生能源的消纳情况纳入灵活性评估的范畴,提出以系统功率供需平衡为核心的高比例可再生能源电网消纳及调峰灵活性理论和分析方法。结合不同的可再生能源出力曲线,分析可再生能源接入对系统调峰灵活性的影响机理;基于系统总体的功率过剩和灵活性资源实时的爬坡能力不足情况,从可再生能源消纳灵活性和系统调峰灵活性两个方面构建评估指标;基于某含高比例可再生能源区域电网的实际数据设置算例,对所评估系统的灵活性盈余以及灵活性不足情况进行定量计算,并以可再生能源和储能机组装机量为变量进行工况区分,分析不同影响因素下系统灵活性的变化。算例表明,随可再生能源机组容量的增大,系统的调峰和消纳灵活性均有所降低,但随着储能机组接入容量的增加,高比例可再生能源造成的功率波动与消纳问题得以有效解决,系统调峰及消纳灵活性均有所提高,验证了本研究所提出的高比例可再生能源电网消纳及调峰灵活性综合评估体系的有效性。

A comprehensive evaluation method was established.The consumption and peak shaving flexibility of high proportion renewable energy grid was quantified.This research included the consumption of renewable energy into the category of flexibility evaluation.A theory of consumption and peak shaving flexibility with system power supply and demand balance as the core was proposed based on the flexibility theory of power system.Combined with the different renewable energy power output curves,the influence mechanism of system peak shaving flexibility caused by renewable energy was analyzed.Based on the overall system power surplus and real-time climbing capacity of flexibility resources,the evaluation indexes were constructed in terms of the flexibility of renewable energy consumption and the flexibility of system peak shaving.With the actual data of a regional grid,an example was set to quantitatively calculate the flexibility surplus and deficit of the evaluated system.And the installed capacity of renewable energy and energy storage units were used as variables to differentiate the working conditions and analyze the flexibility of the system under different influencing factors.The calculation example showed that with the increase of the proportion of renewable energy units,the system flexibility of peak shaving and consumption decreased,but with the increase of the storage capacity,the power fluctuation and consumption problem caused by high proportion of renewable energy could be effectively solved,and the system flexibility of peak shaving and consumption was improved,which verified the effectiveness of the proposed comprehensive evaluation system for the high proportion renewable energy grid consumption and peak shaving flexibility.