水电机组轴系-调速耦合系统动态特性分析

doi:10.11660/slfdxb.20240409

摘要/Abstract

摘要： 水电机组轴系-调速耦合系统动态特性尚未揭示，制约机组调节优化控制。为此，建立了水电机组不同运行模式轴系-调速耦合系统非线性数学模型，研究分析了耦合系统的非线性动态响应特性。首先，采用Hopf分岔理论分析调速系统稳定域和分岔特性。进一步，仿真分析机组不同运行模式轴系-调速耦合系统的时频动态响应特性。结果表明：机组孤网和并网运行调速系统均存在超临界Hopf分岔，机组并网模式调速器参数稳定域较孤网模式增大。机组并网模式调速系统机组、电网频率动态响应存在多频特性，轴系振动会引发调压室水位动态响应超超低频振荡。并网与孤网模式相比并网模式系统动态响应超调量增大，调节时间缩短。机组孤网和并网运行轴系振动均为多频拟周期振动，但孤网模式轴系振动特性更复杂。

关键词: 水电机组, 调压室, 电网, 轴系, 调速系统, 动态特性

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.

Key words: hydropower unit, surge tank, power grid, shafting, hydro-turbine governing system, dynamic characteristic

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.

SHI Yousong, ZHANG Ge, CHENG Jian, LI Yinbin, ZHANG Dongfeng, ZHENG Yang. Dynamic characteristics analysis of shafting and hydro-turbine governing system coupling of hydropower units[J]. Journal of Hydroelectric Engineering, 2024, 43(4): 97-111.

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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

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