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Method for distinguishing temperature of submersible motor based on lumped parameter model

A thermal network model, submersible motor technology, applied in the temperature measurement of moving solids, electrical digital data processing, special data processing applications, etc. cost effect

Active Publication Date: 2012-06-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the temperature information of the submersible motor obtained by using a temperature sensor is restricted by the downhole environment, and to provide a temperature identification method for the submersible motor based on a centralized parameter thermal network model

Method used

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  • Method for distinguishing temperature of submersible motor based on lumped parameter model
  • Method for distinguishing temperature of submersible motor based on lumped parameter model
  • Method for distinguishing temperature of submersible motor based on lumped parameter model

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specific Embodiment approach 1

[0029] Specific implementation mode one: the following combination Figure 1 to Figure 13 Describe this implementation mode, this implementation mode comprises the following steps:

[0030] Step 1: collecting the three-phase stator voltage and three-phase stator current of the submersible motor;

[0031] Step 2: respectively process the three-phase stator voltage and the three-phase stator current through the signal conditioning circuit, and use the processed signals as the stator original current input signal and the stator original voltage input signal;

[0032] Step 3: Calculate the total calorific value u of the submersible motor by using the industrial computer according to the stator original current input signal and the stator original voltage input signal;

[0033] Step 4: in the industrial computer, distribute the total heating value u of the submersible motor to the components of the submersible motor according to the geometric dimensions and energy consumption rati...

specific Embodiment approach 2

[0042] Specific implementation mode two: the following combination Figure 12 and Figure 13 Illustrate this embodiment, this embodiment is the further explanation to embodiment one, adopt industrial computer in step 3 to calculate the total calorific value u of submersible motor according to stator original current input signal and stator original voltage input signal as follows: The total calorific value u of the submersible motor is the iron loss W i , stator copper loss W s and rotor copper loss W r and its expression is u=W i +W s +W r ,

[0043] W i = [ 1 cR m - R d cX m ( X m + 2 ...

specific Embodiment approach 3

[0050] Specific implementation mode three: the following combination Figure 2 to Figure 11 Describe this embodiment, this embodiment is the further explanation to Embodiment 2, the equivalent circuit of each part of submersible motor described in step 4 is to simulate and reduce the thermal convection and thermal contact resistance of its various parts,

[0051] 41): Calculate the thermal contact resistance of the base as the resistance R 1 and R 2 consists of a resistor network in which resistor R 1 and R 2 in series at node J 0 and J 2 Between, R 1 and R 2 The connection point of is node J 1 , R 1 Obtained for direct measurement,

[0052] R 2 = 1 π h c Lr 1 ,

[0053] where h c is the contact coefficient between the base and the iron core, L is the lengt...

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Abstract

The invention provides a method for distinguishing the temperature of a submersible motor based on a lumped parameter model, belonging to the technical field of an application base of combination of thermodynamics modeling and motor control. The method is used for solving the problem that acquisition of temperature information for the submersible motor by using a temperature sensor is restricted by subsurface environments. The method comprises the following steps: firstly, collecting the three-phase stator voltage and three-phase stator current of the submersible motor; then, respectively processing the three-phase stator voltage and the three-phase stator current by a signal conditioning circuit, wherein the processed signals as original current input signals of a stator and original voltage input signals of the stator; calculating the gross calorific power u of the submersible motor by an industrial personal computer (IPC) in accordance with the original current input signals of thestator and the original voltage input signals of the stator; and allocating the gross calorific power u to each part of the submersible motor, combining equivalent circuits of the submersible motor, constructing a lumped parameter heat network model and solving the lumped parameter heat network model to obtain a temperature value of each part of the submersible motor. The method is applied to distinguishing the temperature of the submersible motor.

Description

technical field [0001] The invention relates to a method for identifying the temperature of a submersible motor based on a centralized parameter thermal network model, and belongs to the field of application basic technology combining thermodynamic modeling and motor control. Background technique [0002] Submersible motors generally work at a depth of 1.0-3.5km underground. They are connected to the ground power supply through armored cables. The ambient temperature in the well is as high as 120°C. When the centrifugal pump is discharged, it will take away the heat to dissipate the heat of the motor, so that the temperature rise of the motor will not exceed a certain limit, otherwise the motor will be burned due to excessive temperature rise. In order to ensure its safe, efficient and stable operation, it is necessary to monitor the downhole temperature change of the submersible motor to avoid accidents. [0003] In order to obtain the temperature information of the submer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50G01K13/04
CPCY02T10/82
Inventor 王立国徐殿国张凤娜李邻春郝宏海任翔夏禹吕琳琳董明轩
Owner HARBIN INST OF TECH
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