Abstract
Feedback control is ubiquitous in engineering applications and is a powerful tool to achieve automatic regulation of the outputs of a system. Existing closed-loop control methods typically employ a single feedback loop to regulate each output. This paper proposes a new generalized multi-loop control structure, which utilizes more than one feedback loops to control one output. The control performance of an existing single-loop controller can be boosted by closing extra feedback loops outside the original loop. The main advantage of the multi-loop structure is enhanced robustness without necessarily sacrificing the stability and dynamics of the original control system. The proposed multi-loop structure is a general control technique that can potentially be combined with any existing control methods. A straightforward design guideline for minimum-phase systems is provided to implement the multi-loop controller and determine the control parameters. The proposed idea is illustrated with a power-factor-correction circuit and is validated in simulation and experiments.
© 2025 The Authors.
© 2025 The Authors.
| Original language | English |
|---|---|
| Pages (from-to) | 9289-9300 |
| Journal | IEEE Transactions on Power Electronics |
| Volume | 40 |
| Issue number | 7 |
| Online published | 6 Mar 2025 |
| DOIs | |
| Publication status | Published - Jul 2025 |
Funding
This work was supported by the CityU Power Electronics Research and International Collaboration Fund under Grant 9380173. Open Access made possible with partial support from the Open Access Publishing Fund of the City University of Hong Kong.
Research Keywords
- additional feedback loops
- disturbance rejection
- double-loop
- multi-loop
- robust control
- triple-loop
Publisher's Copyright Statement
- This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/