Design and Stability Analysis of a Fuzzy Adaptive SMC System for Three-Phase UPS Inverter

Khawar Naheem; Young-Sik Choi; Francis Mwasilu; Han Ho Choi; Jin-Woo Jung

Design and Stability Analysis of a Fuzzy Adaptive SMC System for Three-Phase UPS Inverter

Vol. 14, No. 4, pp. 704-711, Jul. 2014

10.6113/JPE.2014.14.4.704

Fuzzy Adaptive Sliding-mode Voltage Controller (FASVC)

Three-phase inverter

Total harmonic distortion (THD)

uninterruptible power supply (UPS)

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Abstract

This paper proposes a combined fuzzy adaptive sliding-mode voltage controller (FASVC) for a three-phase UPS inverter. The proposed FASVC encapsulates two control terms: a fuzzy adaptive compensation control term, which solves the problem of parameter uncertainties, and a sliding-mode feedback control term, which stabilizes the error dynamics of the system. To extract precise load current information, the proposed method uses a conventional load current observer instead of current sensors. In addition, the stability of the proposed control scheme is fully guaranteed by using the Lyapunov stability theory. It is shown that the proposed FASVC can attain excellent voltage regulation features such as a fast dynamic response, low total harmonic distortion (THD), and a small steady-state error under sudden load disturbances, nonlinear loads, and unbalanced loads in the existence of the parameter uncertainties. Finally, experimental results are obtained from a prototype 1 kVA three-phase UPS inverter system via a TMS320F28335 DSP. A comparison of these results with those obtained from a conventional sliding-mode controller (SMC) confirms the superior transient and steady-state performances of the proposed control technique.

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Cite this article

[IEEE Style]

K. Naheem, Y. Choi, F. Mwasilu, H. H. Choi, J. Jung, "Design and Stability Analysis of a Fuzzy Adaptive SMC System for Three-Phase UPS Inverter," Journal of Power Electronics, vol. 14, no. 4, pp. 704-711, 2014. DOI: 10.6113/JPE.2014.14.4.704.

[ACM Style]

Khawar Naheem, Young-Sik Choi, Francis Mwasilu, Han Ho Choi, and Jin-Woo Jung. 2014. Design and Stability Analysis of a Fuzzy Adaptive SMC System for Three-Phase UPS Inverter. Journal of Power Electronics, 14, 4, (2014), 704-711. DOI: 10.6113/JPE.2014.14.4.704.