Double-regulating electric combined device and method of Kaplan turbine

Abstract

The invention relates to a double-regulating electric combined device and method of a Kaplan turbine. The double-regulating electric combined device of the Kaplan turbine is characterized in that the turbine is connected with a centrifugal pendulum through a synchronizing mechanism; the centrifugal pendulum is connected with a guide vane pressure distributing valve through a lever mechanism; the guide vane pressure distributing valve is connected with an oil path of a guide vane servomotor; the opening or the closing or the stopping of the guide vane servomotor is manipulated through the oil path; a feedback unit is connected between the guide vane servomotor and the synchronizing mechanism; meanwhile, the guide vane servomotor is electrically connected with an electric combined and blade pressure distributing valve which is formed by sequentially connecting a displacement sensor, a processing unit and a hydraulic conversion mechanism; the vane pressure distributing valve is connected with the oil path of the guide vane servomotor; and the vane servomotor is with the turbine. The double-regulating electric combined device of the Kaplan turbine has the advantages that the stability of a set is improved, the stopping of the set is facilitated and a brake moment is increased, and the structure is simple, safe and reliable.

Description

technical field [0001] The invention belongs to hydraulic mechanical engineering, in particular to a dual-regulation electrical association device and method for a paddle type water turbine. Background technique [0002] The regulation system of the low-head rotary paddle turbine is double regulation, that is, the movable guide vane of the turbine is linked with the runner blade. It has been proved by experiments and practice that the low-head turbine adopts double regulation, which can enable the turbine to obtain a wider high-efficiency area, improve the overall efficiency of the turbine, maximize the use of water energy, and obtain the maximum kinetic energy. The double adjustment is adjusted in this way: with the increase of the output of the unit, the opening of the movable guide vane increases, the application flow of the turbine increases, the angle of the runner blade increases, and the output of the unit decreases; vice versa; when the unit stops, the opening of the...

AI Technical Summary

Problems solved by technology

This adjustment is well known, but there are two problems. It is correct to improve the efficiency of the turbine and obtain the maximum energy during normal operation and start-up. However, it is correct when the turbine is shut down or transitioned from power generation to phase modulation. The hydraulic turbine has a transition period from the working condition of the turbine to the working condition of the reverse pump and the phase modulation and compression. At this time, this adjustment: 1. During the period of shutdown or transition from power generation to phase modulation (phase modulation and compression), the turbine has In the working condition of the reverse water pump, in this case, the decrease of the opening of the guide vane, the decrease of the flow rate of the unit, and the decrease of the angle of the runner blades are the increase of the head of the reverse water pump, which becomes the cause of the shutdown of the vertical unit and the lifting of the machine during the transition process. The main factors, such as Gezhou generator set shut down and lift, and the Syrian Dishlin power station unit designed by our institute is lifted during the process of phase modulation and compression; increase the axial rear thrust of the horizontal generator set

Decrease the stability of the unit

2. At this time, the unit does not need to obtain a lot of water energy and needs to stop quickly or the transition process is completed quickly. According to the above adjustment, the movable guide vanes of the water turbine are all closed to 0 opening, and the runner blades will be reduced to the minimum angle position. Small, the turbine can get the maximum water energy in the process, which is not conducive to the reduction of downtime and transition time

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