基于热力学参数摄动分析的潜油电机温度辨识

Temperature Identification of Electric Submersible Motors Based on Analysis of Rotor Slot Harmonics

为有效提高无传感器温度辨识方法的计算精度,将热力学参数摄动分析理论应用于潜油电机的温度辨识。基于潜油电机的网络热力学建模,给出潜油电机热参数,尤其是定、转子间耦合电阻参数摄动对电机温度变化的规律性。通过对所推导热力学方程进行频域根轨迹分析,可验证所取热力学参数的稳定性与合理性。仿真与实验结果表明,依据本文所提方法给出的潜油电机定、转子间耦合电阻等热力学参数得到的电机辨识温度可与实测结果相印证。

In view of the limit to the conventional temperature estimation method in the unique high temperature and pressure environment and the urgent request for temperature monitoring of electrical submersible motor（ESM）,this paper proposed a sensor-less temperature estimation method for ESM based on rotor slot harmonics.The core of the identification is by the easy obtained stator voltage and current signals to realize the real-time temperature monitoring of ESM worked in the underground 2～3km deep.According to the rotor temperature analysis expressions,the speed,inductive reactance and rotor resistance can be calculated and the status changes can be monitored.The experimental results show that the maximum error of speed based on rotor slot harmonics is 3r/min and error of temperature is less than 10℃,it shows the validity and feasibility of the whole scheme.