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Pump hydroturbine

A technology for pumping water and turbines, applied in pumps, mechanical equipment, hydroelectric power generation, etc., can solve the problems of low S-characteristics, achieve the effects of improving performance, increasing operating range, and stabilizing speed control

Inactive Publication Date: 2002-11-13
HITACHI MITSUBISHI HYDRO
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Therefore, the S-characteristic exhibited by the unit speed N1 becomes lower at the same guide vane opening amount, thereby making the above-mentioned problem more serious

Method used

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Embodiment Construction

[0034] First, description will be made below under the concept of the present invention. After explaining the concept, the preferred embodiment of the present invention will be described in detail. Usually in pump turbines, especially in pump turbines with a high pumping head, the rotor is designed to exhibit a satisfactory centrifugal action for pumping operation in order to obtain a high pumping head in the pumping operation.

[0035] However, this design has adverse effects in the operation of the pump turbine for the turbine. Here, first, the S-characteristic will be described. The so-called S-characteristic will appear more or less. It is very difficult to completely avoid the occurrence of S-characteristics. The displacement characteristics of the pump turbine usually use the opening of the guide vane as a parameter, and a unit speed is represented by a group and a unit displacement (Q1 The characteristic curve of the relationship between them is represented. On ...

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Abstract

A pump-turbine that can work in pumping mode or power generation mode by switching the rotation direction of the rotor, adjusts the displacement through the rotor on the basis of the opening of the guide vane; senses the speed of the rotor; temporarily sets a target speed set as a first speed different from the rated speed in the power generation start state; the speed responsiveness of the speed controlled by the displacement regulating device is controlled to be a lower value after the speed reaches the target speed than before the speed reaches the target value; finally, The speed stability is improved when the turbine is started and the head range is increased, synchronizing in the process.

Description

Background technique [0001] The present invention relates to a pump turbine for operating the pump or turbine by changing the rotation direction of the rotor. [0002] The pump turbine designed in this way can be operated like a pump or a water turbine, and can satisfactorily exhibit the centrifugal force for the pumping action in the pumping operation, thereby obtaining a predetermined high pumping head. However, design for pumping operation has a negative effect on turbine operation, that is, the output characteristic is called S-characteristic. The S-characteristic is prominent in pump turbines suitable for high pumping heads. [0003] The output characteristics of the pump turbine are usually composed of a set of parameters that use the opening of the guide vane as a parameter, representing the unit speed and unit displacement The characteristic curve representation of the relationship between. The region in which the water turbine operates includes a portion (first ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03B3/10F03B15/04F03B15/08H02P9/04
CPCF03B3/10F03B15/08Y02E10/20Y10S415/91
Inventor 桑原尚夫
Owner HITACHI MITSUBISHI HYDRO
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