Dynamic monitoring method for internal energy loss of water turbine

A technology of internal energy and hydraulic turbines, applied in the direction of machines/engines, hydroelectric power generation, mechanical equipment, etc., can solve problems such as difficulty in distinguishing or dividing the composition of hydraulic turbine energy conversion losses, large errors, etc.

Inactive Publication Date: 2010-03-17
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

However, in the nonlinear model, its nonlinearity is mainly reflected in the dynamics of the hydraulic system, and the description of the output power adopts an approximate linearization process, and the error is large
[0004] However, due to the complexity of the flow path of the turbine and the flow regime of the water flow, it is difficult for the existing research methods and means to distinguish or divide the composition of the loss during the energy conversion process of the turbine
Therefore, targeted analysis, calculation and optimization cannot be carried out from the perspective of the energy loss of the turbine to improve the operating characteristics of the turbine

Method used

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  • Dynamic monitoring method for internal energy loss of water turbine
  • Dynamic monitoring method for internal energy loss of water turbine
  • Dynamic monitoring method for internal energy loss of water turbine

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Embodiment Construction

[0128] The real-time monitoring method for the internal loss of the water turbine proposed by the invention has a simple algorithm, and its core is the formulation of coefficients in the water turbine model. The following steps are included in the specific implementation.

[0129] Step 1: Determine the efficiency curve used to calculate the coefficients and calculate the characteristic parameters

[0130] 1) Calculation using the comprehensive characteristic curve of the model:

[0131] According to the unit parameters, select the rated water head H r For the corresponding unit speed, read the data from the comprehensive characteristic curve of the model, draw the efficiency curve under the rated water head, and determine the highest efficiency point. Find the flow Q at the point of maximum efficiency z , Output N z . The hydraulic loss coefficient f of the water diversion system p Estimate based on actual piping layout.

[0132] 2) Calculated using the measured efficie...

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Abstract

The invention relates to a dynamic monitoring method for internal energy loss of a water turbine. The method decomposes the internal energy loss of the water turbine into four types: bulk loss, hydraulic loss of passageways, mechanical friction loss and impact loss and offers an expression of loss and a calibration method of corresponding loss coefficient; and then by defining the reduced parameters, the method converts the water head and flow rate in a water turbine model to the parameters of actual measurement in operation of a machine unit and further offers a method for calculating variousinternal energy losses inside the water turbine in real time by using the parameters of actual measurement in the machine unit. The method offers basis for the research based on internal energy lossproperty and the improvement of relevant problems in the operation of water turbines.

Description

technical field [0001] The invention relates to the field of analyzing the running stability of a water turbine generating set, in particular to a dynamic monitoring method for internal energy loss during the operation of a water turbine. Background technique [0002] There are two main methods to study the performance of the turbine: one is to make a model runner and conduct energy tests and cavitation performance tests on the test bench to obtain the comprehensive characteristic curve of the runner. According to the similarity theory of hydraulic turbines, based on this comprehensive characteristic curve, the operating characteristics of the actual unit are obtained after a slight correction. This is a relatively traditional research method, which essentially obtains the overall performance index of the runner by measuring the external characteristics of the runner. It is currently used only when a few large manufacturers develop new types of runners. The second is the f...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03B11/00
CPCY02E10/226Y02E10/20
Inventor 曾云张立翔徐天茂武亮王文全闫妍李泽姚激
Owner KUNMING UNIV OF SCI & TECH
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