双调压室多机组水电站水力-调速系统稳定性研究

Study on Stability of Hydraulic and Governor System of Multiple Units with Double-surge Chambers Hydropower Plant

讨论了设置上下游调压室多机组水电站水力调速系统的稳定性,基于系统动力平衡原理与线性方程组稳定性条件系数矩阵特征值实部皆为负值求取水力调速系统的稳定域。通过实例分别计算了不同比例的支管管道参数稳定域及一台机组参数选定下另一台机组的稳定域。结果表明,多机组电站的各支管管道惯性时间常数越接近,其合并机组与未合并机组方法的计算结果越接近;多台机组采用不同调速器参数同样可确保系统的稳定,为实际工程提供了可靠的理论依据。

The stability of governor system of hydropower plant of multi-units with the downstream and upstream surge chamber is discussed in this paper. The stability domain of governor system is obtained by the dynamic balance principle of the system, the stability condition of the system of linear equations and negative eigen values of the real component of the coefficient matrix. The stability domain of the parameters of different-scale branch pipe and another unit stability domain of the parameters with giving other unit parameters are calculated by the instances, respectively. The results with the method of merging units are more close to those of unconsolidated unit method when the branch pipes inertia time constants get closely. In addition, the stability of system is also ensured by choosing the different parameters of governors for multi-units. It provides reliable theoretical basis for the actual engineering projects.