Discrete-time current regulator for AC machine drives
In a practical alternating current (AC) machine drive system, a direct discrete-time current regulator model based on a zero order hold (ZOH) equivalent discrete-time machine model should be the first choice to be established compared with the discrete-time current regulator model based on continuou...
Saved in:
| Main Authors: | , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2022
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/154984 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | In a practical alternating current (AC) machine drive system, a direct discrete-time current regulator model based on a zero order hold (ZOH) equivalent discrete-time machine model should be the first choice to be established compared with the discrete-time current regulator model based on continuous-time machine model when designing a digital current regulator. However, it is complicated to establish a direct discrete-time current regulator for asymmetric machine1 model due to the involvement of matrix exponential related to unequal machine inductance parameters. In order to overcome this issue, a simple direct discrete-time current regulator based on flux model is proposed, where a novel AC machine model is developed by employing a new feed-forward voltage compensation. In addition, a direct discrete-time flux observer with low parameter sensitivity is proposed to compensate the inherent one-step delay in practical systems. Simulation results and theoretical analysis have shown that the proposed discrete-time current regulator and flux observer have good parameter robustness and stability. Also, the experimental verification is performed on a AC machine drive test rig. |
|---|