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A flexible current tracking control of sensorless induction motors via adaptive observer
Li Li1, Zhongcai Zhang1, Chunxiao Wang1
1School of Engineering, Qufu Normal University, Rizhao 276826, China.
ISA Transactions
|March 17, 2019
Summary
This study introduces a novel sensorless current control method using adaptive observers, eliminating the need for persistent excitation. The approach enhances control range and robustness, validated by simulations.
Area of Science:
- Electrical Engineering
- Control Systems
Background:
- Sensorless current control is crucial for motor drives but often requires persistent excitation.
- Coupling between control and parameter estimation limits performance.
Purpose of the Study:
- To develop a sensorless current control method without persistent excitation.
- To improve robustness and control range in electrical systems.
Main Methods:
- An interconnected adaptive observer-based backstepping control strategy was designed.
- Mathematical stability theories were employed for observer design.
- Fluxes and external load estimation were performed using the observer.
Main Results:
- The method successfully achieved sensorless current control without persistent excitation.
- Uncoupling control and parameter estimation broadened the current control range.
- The observer demonstrated effective online tracking and adaptability, ensuring parameter robustness.
Conclusions:
- The proposed method offers a superior alternative for sensorless current control.
- It effectively addresses limitations of traditional coupled control-estimation approaches.
- Numerical simulations confirm the theoretical effectiveness and advantages.
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