Abstract: China is abundant of hydraulic energy resources suitable for the development of impact turbine units. The core technologies of developing and manufacturing are mainly in the hands of a few European and American hydropower equipment manufacturers, hence having limited the development and utilization of large-capacity impact turbine and regulation control system. On the basis of summarizing the research and practice experiences, we propose an innovative scheme of adopting three CPUs in the electrical regulator, and a control device of impact turbine diverter by introducing the unit characteristic curve factor into the control of large multi-nozzle impact turbine for the first time. By putting into operation this speed regulating system, we have obtained good economic and social benefits. This research is expected to be conducive to the type-selection, design, standardization and application of extra-large multi-nozzle impulse turbine.

Key words: extra-large impulse turbine, speed regulation system, multi-nozzle, diverter, unit control