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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.

Inactive Publication Date: 2006-01-04
HITACHI MITSUBISHI HYDRO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The regulator gain is sufficient to ensure this stability only in the first region outside the S characteristic region (in which the Q1 value decreases as the N1 value increases), however, in the S characteristic where the positive feedback operation is performed The area is not enough to ensure the stability of the operation

Method used

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  • Method for controlling water-turbine of water pump
  • Method for controlling water-turbine of water pump
  • Method for controlling water-turbine of water pump

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Embodiment Construction

[0073] Some preferred embodiments of the present invention will be explained below with reference to the accompanying drawings.

[0074] see below figure 2 The overall structure of the pump turbine of the present invention will be explained. The water collected in the upper reservoir 101 is introduced into the draft pipe 102, and then divided into the water pump turbines 14α-14γ by the draft pipes 103α-103γ, respectively.

[0075]The amount of water flowing from the guide pipes 103α-103γ into the impellers 114α-114γ of the pump turbines 14α-14γ is controlled by the guide valves 112α-112γ, and these guide valves are respectively controlled by the regulating devices 110α-110γ. The power of the swooping water makes the impellers 114α-114γ rotate, and the power of the impellers is transmitted to the generators 111α-111γ. The electricity generated by the generator is delivered to the power system.

[0076] The water flowing through the pump turbines 14α-14γ is introduced into t...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03B15/04F03B3/10H02P9/04F16D33/08
CPCF16D33/08
Inventor 桑原尚夫片山庆中川博人萩原春树
Owner HITACHI MITSUBISHI HYDRO
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