For a more comprehensive understanding and mastering of the structure and features of hydro-turbine governing system under different working conditions, the same parameters were compared and studied on the basis of the modeling and sim-ulation results of hydro-turbine governing system mostly obtained in ideal research conditions. Through linear and nonlinear modeling of hydro-turbine governing system, simulation study on linear and nonlinear dynamic characteristics of hydro-turbine governing system was conducted by matlab/simulink. Idle frequency fluctuations and power disturbance response curves under linear condition and the nonlinear system response are obtained from the simulation, and the rotational speed and servomotor stroke curves under linear and nonlinear conditions were compared and analyzed. The analysis shows that linear modeling is suit-able for small fluctuation while nonlinear modeling is suitable for large fluctuation. The results of these two cases are similar and able to reflect the dynamic process of the same governing system. The conclusion can provide some help for the control of hydro-turbine governing system in different working conditions.%为了更加全面地了解和掌握水轮机调速系统的组成结构和不同工况下的特性,在大量研究理想条件下水轮机调节系统建模与仿真结果的基础上,对水轮机调节系统进行线性和非线性建模,并运用matlab/simu-link对水轮机调节系统的线性和非线性动态特性进行仿真研究,从而得到了线性条件下空载频率波动和功率扰动波动响应曲线以及非线性环节的系统响应,并对这2种条件下的转速和接力器行程曲线进行了对比分析. 分析结果表明,在小波动情况下适合运用线性模型,在大波动情况下适合运用非线性模型,而且这2种情况下得到的结果相差无几,均能反映同一系统的动态过程. 该结论将有助于水轮机调节系统在不同工况下的控制.
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