Comparative Stability Analysis of Synchronous Reference Frame Current Controllers Operated at High Fundamental Frequency

Synchronous reference frame (SRF) proportional-integral (PI) current controller (CC) is the most well-established solution for current regulation in AC machine drives and grid-connected voltage source converters. The design of high dynamic performance current control loop has several challenges in h...

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Bibliographic Details
Published in:IEEE transactions on transportation electrification 2023-06, Vol.9 (2), p.1-1
Main Authors: Diab, Ahmed M., Guo, Feng, Yeoh, Seang Shen, Bozhko, Serhiy, Gerada, Chris, Galea, Michael
Format: Article
Language:English
Subjects:
AC machines
Controllers
Current control
current controller
Delay effects
Delays
Dynamic stability
Dynamic structural analysis
Frequency control
High-Speed motor drives
Mathematical analysis
Mathematical models
Pulse duration modulation
Resonant frequencies
Stability analysis
Switches
synchronous reference frame
time delay
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Summary:Synchronous reference frame (SRF) proportional-integral (PI) current controller (CC) is the most well-established solution for current regulation in AC machine drives and grid-connected voltage source converters. The design of high dynamic performance current control loop has several challenges in high-speed and high-power applications due to the effects of controller gain's selection, non-linearities, parameters variations, disturbances, digital implementation, and time delays. These become more significant due to high operating frequencies, which severely degrade dynamics and stability of the current control system. Various structures of SRF PI CCs have been reported in the literature. However, the aforementioned effects on the dynamics at high frequency operation have not been thoroughly addressed. Therefore, a comparative analysis of different SRF PI CCs' structures is proposed in this paper, which addresses the design principles and gains' selection while also taking into account the heavy computational burden and PWM delays. Additionally, the paper thoroughly analyzes and evaluates the dynamics and stability of the system operating at high fundamental frequencies. The advantages and limitations of each SRF PI CC scheme are studied and reported. The performance of the SRF PI CCs is comprehensively tested to demonstrate the analytical outcome of this study.
ISSN:2332-7782
2577-4212
2332-7782
DOI:10.1109/TTE.2022.3208825