Abstract
This paper presents a novel oversampling deadbeat current control approach for permanent magnet synchronous motor drives capable of operating at a controller sampling frequency multiple of the power converter switching frequency. Model-based controllers suffer from heavy computational demand and performance degradation due to parameter uncertainties. The proposed controller concurrently with field-programmable gate array implementation permits to achieve a constant switching frequency and an optimal current ripple along with a high current-loop bandwidth and robust behavior to parameter variation. A disturbance observer has been added to the proposed controller in order to compensate for the converter voltage distortions. The proposed control strategy is tested through both simulations and experiments.
Highlights
In the field of variable-speed AC drives Permanent Magnet Synchronous Motors (PMSMs), compared to other motor types like induction motors, offer several advantages
For clarity and simplicity, a standard proportional integral (PI) controller has been used for the speed loop
The PMSM is fed by a two level IGBT converter while the control board specification can be found in [22]
Summary
In the field of variable-speed AC drives PMSMs, compared to other motor types like induction motors, offer several advantages. Previous work has been done combining the DB controller with a standard PI to reduce the performance deterioration due to voltage non-linearities and parameters mismatches [7], while in [5] the control sensitivity from model uncertainties is reduced by introducing a disturbance observer for the DB controller. The proposed oversampling approach increase the robustness to machine parameters variation, on the other hand it introduces a distortion in the control voltages fed into the PWM. To eliminate this behaviour a compensation strategy has been developed and successfully validated.
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