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Fuzzy-Based Nonlinear Variable Structure Control of DC-AC Inverters for Wind Energy Systems

En-Chih Chang 1, Yow-Chyi Liu 2, and Kuo-Yuan Liao 1
1. Department of Electrical Engineering, I-Shou University, Kaohsiung City, Taiwan, R.O.C.
2. Department of Electrical Engineering, Kao Yuan University, Kaohsiung City, Taiwan, R.O.C.

Abstract—This paper presents a fuzzy-based nonlinear variable structure controlled DC-AC inverter, and is suitable for the application of wind energy systems. The Nonlinear Variable Structure Control (NVSC) can provide zero tracking error and achieves system behavior with high accuracy. But, the chatter problem still exists in switching manifold of NVSC. The chatter incurs steady-state errors and high voltage harmonics in DC-AC inverter output, thus deteriorating the performance of the Wind Energy System (WES). To remove the chatter, the NVSC’s switching manifold can be smoothed by Fuzzy Logic (FL). By combining NVSC with FL, a closed-loop wind energy DC-AC inverter system will yield low total harmonic distortion, zero tracking error, and fast dynamic response. Experimental results are given to conform that the proposed control method can obtain good performance under different kinds of loading. Because the proposed control method is simpler to realize than prior control methods and provides zero tracking error, this paper will be of interest to designers of related green energy.

Index Terms—DC-AC inverter, Nonlinear Variable Structure Control (NVSC), chatter, Wind Energy System (WES), Fuzzy Logic (FL)

Cite: En-Chih Chang, Yow-Chyi Liu, and Kuo-Yuan Liao, "Fuzzy-Based Nonlinear Variable Structure Control of DC-AC Inverters for Wind Energy Systems," International Journal of Electrical Energy, Vol. 3, No. 4, pp. 243-247, December 2015. doi: 10.18178/ijoee.3.4.243-247

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