Rotating speed and flow optimizing method and system for variable-speed operation of mixed-flow water turbine

A technology of Francis and water turbines, applied in mechanical equipment, hydropower, engine components, etc., can solve problems such as difficulty in obtaining operating characteristic curves of Francis turbines, lack of accumulation of actual operating data, etc., achieve flexible configuration and operation, and increase additional Energy gain, the effect of low difficulty of acquisition

Active Publication Date: 2021-12-07
KUNMING UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

Moreover, most of the power plants in my country are new power plants, lacking the accumulation of actual operating data, so it is difficult to obtain the operating characteristic curve of the Francis turbine

Method used

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  • Rotating speed and flow optimizing method and system for variable-speed operation of mixed-flow water turbine
  • Rotating speed and flow optimizing method and system for variable-speed operation of mixed-flow water turbine
  • Rotating speed and flow optimizing method and system for variable-speed operation of mixed-flow water turbine

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Experimental program
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Embodiment 1

[0063] Such as figure 1 As shown, this embodiment provides a speed and flow optimization method for variable-speed operation of a Francis turbine. This method starts from the basic data of the existing Francis turbine model comprehensive characteristic curve, and derives the variable speed of the Francis turbine. The calculation method of the optimal speed and flow for unit operation can provide a certain theoretical basis and data support for the control and research of mixed flow variable speed units in power plants. The steps of this method are as follows:

[0064] Step S1 , drawing tangent lines 2 to the comprehensive characteristic curve of the existing Francis turbine model to obtain multiple tangent points 3 . Specifically include:

[0065] On the comprehensive characteristic curve of the Francis turbine model, along the axis Q perpendicular to the abscissa 11 tangent 2 to each equal efficiency curve circle in the integrated characteristic curve of the Francis turbin...

Embodiment 2

[0097] Such as image 3 As shown, this embodiment provides a speed and flow optimization system for variable speed operation of Francis turbines, and the system specifically includes:

[0098] The tangent line drawing module M1 is used for drawing tangent lines 2 on the comprehensive characteristic curve of the existing Francis turbine model to obtain multiple tangent points 3 . Specifically include:

[0099] The tangent drawing module M1 draws a tangent 2 to each equal efficiency curve circle in the comprehensive characteristic curve of the Francis turbine model along the direction perpendicular to the abscissa axis on the comprehensive characteristic curve of the Francis turbine model, The plurality of tangent points 3 are obtained; the tangent points 3 are connection points between each of the equivalent efficiency curve circles and the corresponding tangent lines 2 .

[0100] The optimal path determination module M2 is used to connect the plurality of tangent points 3 wi...

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Abstract

The invention relates to a rotating speed and flow optimizing method and system for variable-speed operation of a mixed-flow water turbine, and belongs to the field of water turbine parameter optimizing processing. The method comprises the following steps: firstly, conducting tangent drawing processing on an existing mixed-flow water turbine model comprehensive characteristic curve to obtain a plurality of tangent points; connecting the plurality of tangent points with optimal working condition points in the mixed-flow water turbine model comprehensive characteristic curve, and determining an optimal path for the variable-speed operation of the mixed-flow water turbine; on the mixed-flow water turbine model comprehensive characteristic curve, determining the unit flow and the unit rotating speed at the intersection point of the optimal path and each equal guide vane opening line; and finally, calculating the optimal rotating speed and the optimal flow of the mixed-flow water turbine under any water head and guide vane opening combination according to the unit rotating speeds and the unit flows. According to the method, the optimal rotating speed and the optimal flow of the mixed-flow water turbine under any water head and guide vane opening combination can be calculated by utilizing existing basic data, and the overall hydraulic efficiency of the mixed-flow water turbine can be effectively improved.

Description

technical field [0001] The invention relates to the field of water turbine parameter optimization processing, in particular to a speed and flow optimization method and system for variable speed operation of a Francis water turbine. Background technique [0002] The control core of the variable speed Francis turbine is to automatically optimize the speed and flow rate under different combinations of water head and guide vane opening. The optimization is based on the operating characteristic curve of the Francis turbine that has actually been put into operation for many years. However, this curve belongs to variable speed. The control core of the speed unit is generally in the hands of foreign main equipment manufacturers such as ALSTOM, GE, ANDRITZ, and is strictly confidential to our country. Moreover, most of the power plants in my country are newly built power plants and lack the accumulation of actual operating data. Therefore, it is difficult to obtain the operating char...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03B15/00
CPCF03B15/00Y02E10/20
Inventor 王文全喻智锋洪金玲陈云良张昌兵徐永党晓强闫妍
Owner KUNMING UNIV OF SCI & TECH
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