Research On Soft Mearureing Temperature Of Electric Submersible Motor Based On Analyzing Rotor Slot Harmonics

This paper is based on National Natural Science Foundation project"Temperature Soft-sensing for Submersible Motor Based on Network Thermodynamic"(50877016), focusing on the common problem of high temperature and high pressure in the oil field of China, research on the smart power supply of the submersible motor in the environment where filled with sand and gas via sensorless temperature estimation. By conducing the mathematical mechanism between rotor slot harmonics and submersible motor temperature, make the foundation of real-time temperature monitoring system of submersible motor. Design the closed-loop control system of temperture estimation and converter power supply, servering as theoretical reference of submersible motor energy efficient operation of intelligent power distribution and stability control. The main content is as follow:Research on the method of obtaining the frequency spectrum of the stator current according to FFT. Give the relation between the speed of motor and rotor slot harmonics. Deduce the least square method based on motor modeling in ABC coordinate andαβcoordinate.Build the three phase induction motor model in ABC coordinate and transfer it toαβcoordinate. Use the least square method to estimate the submersible parameter. Verify the result of FFT. Lay the basis for identification of submersible motor based on rotor slot harmonics.Design the hardware platform, which is featured by IPC and PCI. Identify the motor temperature in different speed and different load. Building the monitoring system by DSP2812 and realize the real-time temperature estimate and protection on overheat, verifys the accuracy of submersible motor temperature identification and frequency droop control system under the condition of overheat.Establish three-dimensional submersible motor and armored cable model by solid works and import it into Ansys Workbench. Achieve the Mathematical deduction on the temperature field of submersible motor. Analyze the temperature field of the motor. Thus verify the accuracy of this temperature monitoring system.