Abstract
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.
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