水力发电学报2024，Vol.43Issue(4)：97-111,15.DOI:10.11660/slfdxb.20240409
水电机组轴系-调速耦合系统动态特性分析
Dynamic characteristics analysis of shafting and hydro-turbine governing system coupling of hydropower units
摘要
Abstract
The dynamic characteristics of the shafting and hydro-turbine governing system(HTGS)of hydropower units(HU)have not been revealed,which restricts the optimal control of HU regulation.This paper develops a nonlinear mathematical model for a shafting-HTGS coupling system in different operating modes,and examines its nonlinear dynamic response characteristics.First,the Hopf bifurcation theory is used to analyze the stable region and bifurcation characteristics of the HTGS.Then,the time-frequency dynamic response characteristics of this coupling system are simulated and analyzed for its different operating modes.The results show that supercritical Hopf bifurcation exists in HTGS of both the isolated network and grid-connected HU,and the stability region of the governor parameter under the grid-connected HU is significantly larger than that of the isolated network HU.The HTGS frequency dynamic response of the HU and the power grid in the grid-connected mode have multi-frequency characteristics,and shafting vibration causes the dynamic response of the surge tank water level to ultra-low frequency oscillation(ULFO).The dynamic response overshoot of the grid-connected HU is significantly larger than that of the isolated HU,but its adjustment time is shorter.The shafting vibrations of isolated and grid-connected HUs are multi-frequency quasi-periodic,but the dynamic characteristics of shafting vibrations of the isolated HU are more complex.关键词
水电机组/调压室/电网/轴系/调速系统/动态特性Key words
hydropower unit/surge tank/power grid/shafting/hydro-turbine governing system/dynamic characteristic分类
能源与动力引用本文复制引用
时有松,张舸,程建,李银斌,张东峰,郑阳..水电机组轴系-调速耦合系统动态特性分析[J].水力发电学报,2024,43(4):97-111,15.基金项目
国家自然科学基金(52009096) （52009096）
湖北省自然科学基金(2022CFD165) （2022CFD165）
