ABSTRACT:
A
terminal sliding mode control method based on nonlinear disturbance observer is
investigated to realize the speed and current tracking control for PMSM drive
system in this paper. The proposed method adopts the speed-current single-loop
control structure instead of the traditional cascade control in the vector
control of PMSM. Firstly, considering the nonlinear and the coupling
characteristic, a single-loop terminal sliding mode controller is designed for
PMSM drive system through feedback linearization technology. This method can
make the motor speed and current reach the reference value in finite time,
which can realize the fast transient response. Although the sliding mode
control is less sensitive to parameter uncertainties and external disturbance,
it may produce a large switching gain, which may cause the undesired
chattering. Meanwhile, the sliding mode control cannot keep the property of
invariance in the presence of unmatched uncertainties. Then, a nonlinear
disturbance observer is proposed to the estimate the lump disturbance, which is
used in the feed-forward compensation control. Thus, a composite control scheme
is developed for the PMSM drive system. The results show that the motor control
system based on the proposed method has good speed and current tracking
performance and strong robustness.
KEYWORDS:
1. PMSM
drive
2. Terminal
sliding mode control
3. Feedback
linearization
4. Nonlinear
disturbance observer
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Figure 1: Block Diagram Of PMSM Control System
EXPECTED SIMULATION RESULTS:
Figure
2: The Motor Response Waveforms Of The Proposed Method: (A) Motor Speed (B)
Dq-Axes Current (C) Phase Current
Figure
3: The Speed Waveforms Of Three Methods: (A) The Speed When The Motor Starts
(B) The Speed With Load Disturbance
Figure
4: The Motor Waveforms With The Parameter Disturbance. (A) Motor Speed (B)
Dq-Axes Current
Figure
5: The Contrastive Results With The Common Sliding Mode Control Method. (A)
D-Axes Current (B) Q-Axes Current
CONCLUSION:
In this paper, a novel control method based on
terminal sliding mode control through feedback linearization technology has
been studied for PMSM drive system. The controller adopts the speed-current
single-loop structure, which has the fast transient response. With the designed
terminal sliding mode controller, the speed and current stabilizing control is
achieved. Then, considering the lump disturbance in the drive system, a
nonlinear disturbance observer is designed to deal with the mismatched
disturbance, and it is used for the feed-forward compensation, and the
robustness is improved effectively. Simulation results have proved that the
controller has good robust performance and speed tracking performance under
various conditions. But the speed and current control problems in the
flux-weakening control areas are not considered at present, which will be the
future research emphases.
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