摘要
面向可再生能源消纳背景下电网深度调峰需求,提高调峰范围成为燃气轮机发展必不可少的一个环节。本文提出一种海上水力储能耦合燃气轮机发电系统,分别对11410 kW燃气轮机和储能系统进行数学建模和求解,得到水泵水轮机全工况运行特性曲线,分析燃气轮机不同输出负荷比对耦合系统性能的影响,并与常规燃气轮机运行性能进行比较。研究表明:设计进、排水流量下,水泵水轮机安装在海平面下245 m时其达到最佳运行效率72.88%;耦合系统的调峰深度达到81.54%,相比基准燃气轮机机组增长11.54%;外界相对负荷相等时,耦合系统的运行效率要显著高于常规燃气轮机;耦合系统的输出功率与运行效率随外界相对负荷的增大先增大后减小,且在外界相对负荷为0.52时输出功率与运行效率达到峰值9336.98 kW、25.98%;外界延时阶跃负荷下,耦合系统日平均效率随着峰谷比的减小逐渐增大;耦合系统日平均效率明显高于常规燃气轮机,相对增效随峰谷比的减小或谷荷频率的增大逐渐增大。
Facing the demand for deep peak shaving of power grids under the background of renewable energy consumption,increasing the peak shaving range has become an indispensable part of the development of gas turbines.An offshore hydraulic energy storage coupled gas turbine power generation system was proposed.Mathematical modeling and solving of a 11410 kW gas turbine and energy storage system were carried out to obtain the operating characteristic curves of pump turbine under all operating conditions.The influence of output load ratio of gas turbines on the performance of the coupling system was analyzed.Moreover,the performance of the coupling system was compared with that of the conventional gas turbines.The research shows that,the optimal operating efficiency of the pump turbine reaches 72.88%when the head is 245 m under the designed filling and drainage flow rate.The peak shaving depth of the coupled system reaches 81.54%,which is 11.54%higher than that of the reference gas turbine unit.When the relative demand loads are equal,the operating efficiency of the coupled system is significantly higher than that of reference gas turbines.The output power and operating efficiency of the coupled system increases first and then decreases with the rise of the demand load,and reaches a peak at 9336.98 kW and 25.98%at relative demand load of 0.52.Under delay-step demand load,the daily average efficiency of the coupling system gradually increases with the decrease of the peak-to-valley ratio and is comparatively higher than that of reference gas turbines.The relative efficiency increases with the decrease of the peak-to-valley ratio or increase of the valley charge frequency.
作者
彭远超
杨承
马晓茜
PENG Yuanchao;YANG Cheng;MA Xiaoqian(School of Electric Power,South China University of Technology,Guangzhou 510640,China)
出处
《热力发电》
CAS
CSCD
北大核心
2021年第4期36-43,共8页
Thermal Power Generation
基金
广东省基础与应用基础研究基金项目(2020A1515011103)。
关键词
水力储能
燃气轮机
耦合系统
水泵水轮机
调峰
阶跃负荷
hydraulic energy storage
gas turbine
coupling system
pump turbine
peak shaving
step load
