Abstract
In a practical alternating current (ac) machine drive system, a zero-order hold equivalent discrete-time machine model motivates the development of a direct discrete-time current regulator structure. However, it is complicated to establish the direct discrete-time current regulator for asymmetric machine11Asymmetric machine denotes a ac salient machine in this article, whereas the symmetric machine denotes a ac non-salient machine. model due to the involvement of complex matrix exponential related to unequal machine inductance parameters. In order to overcome this barrier, a novel direct discrete-time current regulator based on the flux model is proposed, where a modified ac machine model considering delay compensation is developed and a new feed-forward voltage compensation is designed to eliminate the matrix exponential. In addition, a discrete-time flux observer is proposed and can work in the proposed current regulator to suppress the adverse one-step delay effect on the feed-forward voltage compensation and current regulator. The theoretical analysis has shown that the proposed discrete-time current regulator and flux observer have good parameter robustness and stability. Also, the experimental verification is performed on an ac machine drive test rig.
| Original language | English |
|---|---|
| Pages (from-to) | 5847-5858 |
| Number of pages | 12 |
| Journal | IEEE Transactions on Power Electronics |
| Volume | 37 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 1 May 2022 |
| Externally published | Yes |
Keywords
- Alternating current (ac) machine
- current regulator
- discrete-time model
- parameter robustness
ASJC Scopus subject areas
- Electrical and Electronic Engineering