Pump turning direction hydraulically-started reversible water turbine and work method thereof

Abstract

The invention discloses a pump turning direction hydraulically-started reversible water turbine. The pump turning direction hydraulically-started reversible water turbine comprises a ring pipe, telescopic joints, a top cover, a main shaft, a seat ring, a movable guide vane, a tail water pipe and a runner. The ring pipe is connected with a needle valve operation device. The top cover is provided with a water guiding chamber. The runner is provided with a main runner channel and an auxiliary runner channel. The water inlet end of a needle valve communicates with a pressure steel pipe behind a unit water inlet valve. The water outlet end of the needle valve is connected with the ring pipe. The ring pipe is connected with the multiple telescopic joints. The telescopic joints communicate with the water guiding chamber on the top cover. An outlet of the water guiding chamber corresponds to an opening in the outer edge of the auxiliary runner channel. An opening in the inner side of the auxiliary runner channel communicates with the tail water pipe. The inner side of the seat ring communicates with the movable guide vane. The inner side of the movable guide vane corresponds to an opening in the outer edge of the main runner channel. An opening in the inner side of the main runner channel communicates with the tail water pipe. The main shaft is connected with the runner to transmit torque. Pump turning direction starting does not impact on a power grid and does not generate harmonic sources, operation is easy, extra space is not occupied, components prone to damage do not exist, and safety and reliability are achieved.

Description

technical field [0001] The invention relates to a water turbine, in particular to a reversible water turbine with pump rotation and hydraulic start and a working method thereof. Background technique [0002] At present, for medium and large mixed-flow reversible hydro-generator units, the start-up method of the pump rotation condition directly powered by the grid to the motor will cause a great impact on the grid. Usually, the unit needs to be rotated to the synchronous speed, and then connected to the grid at the same time. This requires expensive starting equipment, complicated operating procedures, and additional equipment takes up a lot of space, such as the commonly used inverter starting and back-to-back starting methods. When the frequency converter is used, it will generate harmonics, which will become the harmonic source of the power grid system, and at the same time cause the voltage of the plant power system to be deformed; back-to-back start-up requires special e...

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Problems solved by technology

[0003] In order to overcome the disadvantages of complicated start-up operation, expensive equipment, and large space occupied by the equipment in the pump rotation condition of the current medium and large reversible units, the present invention provides a reversible water turbine that can adapt to the rapid start of the pump rotation condition and its working method. Use water energy to start, control the flow of water entering the unit by operating the needle valve, adjust the speed of the unit, and connect to the grid at the same time when the synchronous speed is reached, and enter the pump rotation mode to operate. The operation is simple and fast, and there is no impact on the grid system and no harmonics. No need to increase equipment space separately, saving investment and reducing the risk of startup failure

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