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JACIII Vol.22 No.5 pp. 629-639
doi: 10.20965/jaciii.2018.p0629
(2018)

Paper:

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Stability Regions of Nonlinear LCL-Filtered Converter with Converter-Current-Feedback Control Without Damping

Qingyi Wang*,**, Xuefen Wang*,**, Min Ding*,**,†, Quan Yin***, and Haichun Li***

*School of Automation, China University of Geosciences
No. 388, Lumo Road, Wuhan 430074, China

**Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems
Wuhan 430074, China

***School of Automation, Huazhong University of Science and Technology
1037 Luoyu Road, Wuhan 430074, China

†Corresponding author

Received:
February 28, 2018
Accepted:
May 21, 2018
Published:
September 20, 2018
Creative Commons License
Keywords:
converter, nonlinear LCL-filtered model, stable boundaries, undamping
Abstract

The stability regions of a LCL-filtered converter adopting converter-current-feedback control without damping are analyzed. The nonlinear LCL-filtered model is presented to investigate its influence on the system stability. The stability analysis is performed by means of the Nyquist diagram in s domain. It reveals that three factors have the dominant effects on the system stability, including internal loss of LCL-filtered model, PWM transport delay and controller parameters. The undamped stability boundaries of the system gain calculated by the symmetrical optimum method are obtained. It can be found that stable regions for the nonlinear LCL-filtered system are extended into a continuous region of ratios of LCL filter resonance frequency to control frequency from three distinct regions. Finally, the stable regions are validated by the nonlinear model simulation, and experimental results verify the theoretical analysis.

Nonlinear LCL-filtered system stability regions are extended into three distinct regions

Nonlinear LCL-filtered system stability regions are extended into three distinct regions

Cite this article as:
Q. Wang, X. Wang, M. Ding, Q. Yin, and H. Li, “Stability Regions of Nonlinear LCL-Filtered Converter with Converter-Current-Feedback Control Without Damping,” J. Adv. Comput. Intell. Intell. Inform., Vol.22 No.5, pp. 629-639, 2018.
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