Method for controlling water-turbine of water pump

A technology of water pump turbine and flow controller, which is applied in the direction of controlling generators, control systems, mechanical equipment, etc., can solve problems such as insufficient guarantee of operation stability.
CN1234968CInactive Publication Date: 2006-01-04HITACHI MITSUBISHI HYDRO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HITACHI MITSUBISHI HYDRO
Publication Date
2006-01-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

An object of the present invention is to provide a pump turbine capable of improving the stability of the governor by fully lessening the influences by the S-characteristics even when the running point of the pump turbine is in the S-characteristics region. For this purpose, in a pump turbine comprising a runner which is coupled with a generator motor, discharge control apparatus for controlling the quantity of water passing through the runner, and a governor for controlling said discharge control apparatus to keep the runner speed at a predetermined speed, the arithmetic apparatus of said governor is controlled to temporarily open said closing discharge control apparatus in the leading half of the speed decrease or earlier after the first speed increase upon a load rejection turns to a speed decrease upon a load rejection which abruptly shuts off power from the generator motor, so that the rotational speed of the runner goes down at much slower rate than the rate of increasing immediately after a load rejection.
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Description

technical field

[0001] The present invention relates to a method of controlling a pump turbine by changing the direction of the impeller to function as a pump and turbine (by changing the direction of rotation of the impeller). Background technique

[0002] Generally speaking, for pump turbines, especially those with high head, the impeller can be designed to obtain a sufficient centrifugal pumping effect, so as to obtain a higher pressure head during pumping operation.

[0003] However, this design will have adverse effects on the turbine working conditions of the pump turbine. Especially when, for example, so-called S-characteristics occur, it is said that it is difficult to completely avoid such S-characteristics.

[0004] It has been recognized that, especially for high head pump turbines, the S characteristic is a bottleneck (weak link) in the internal design, installation height, etc. of the upstream and downstream waterways. Therefore, there have been various scheme...

Claims

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