This paper investigates the stability control of dynamic system of hydropower station with two turbine units sharing a super long headrace tunnel (SLHT). Firstly, the model of dynamic system of hydropower station with two turbine units sharing a SLHT is established. Then, the method for the description and evaluation of stability of hydropower station is proposed. The stable domain is obtained. The dynamic response characteristics are analyzed. Finally, the stability of hydropower station under asymmetric turbine units is studied based on stable domain and dynamic response. The effects of asymmetric factors on the stability of hydropower station are revealed. The results indicate that there are two bifurcation lines (BLs) for the hydropower station with two turbine units sharing a SLHT. The stable domain is the left domain of the two BLs. The stable domain provides an effective method for the description and evaluation of stability. The stability under asymmetric turbine units depends on the total value of asymmetric parameters. Under the effect of asymmetric factors, the dynamic response processes (DRPs) of turbine frequencies show asymmetric characteristics. The asymmetric governor parameters and load adjustments have an obvious effect on the stability of hydropower station and DRPs of turbine frequencies.

本文研究了两台机组共用一条超长引水隧道（SLHT）的水电站动力系统的稳定性控制。首先，建立了两台机组共用一个SLHT的水电站动力系统模型。然后，提出了水电站稳定性的描述与评价方法。获得稳定域。分析了动态响应特性。最后，基于稳定域和动态响应，研究了非对称机组下水电站的稳定性。揭示了非对称因素对水电站稳定性的影响。结果表明，水电站有两条分叉线 (BL)，其中两个涡轮机组共享一个 SLHT。稳定域是两个 BL 的左域。稳定域为稳定性的描述和评价提供了一种有效的方法。非对称机组下的稳定性取决于非对称参数的总值。在非对称因素的影响下，汽轮机频率的动态响应过程（DRPs）表现出非对称特性。不对称调速器参数和负荷调整对水电站的稳定性和汽轮机频率的DRPs有明显的影响。