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Particle Swarm Method-Based Hyperbolic Sliding Mode Control Strategy for the Optimal Design of Parallel-Connected UPS Systems

En-Chih Chang, Rong-Ching Wu, Pei-Shan Wang, and Kuo-Yuan Liao
Department of Electrical Engineering, I-Shou University, Kaohsiung City, Taiwan, R.O.C.

Abstract—In this paper, the optimal design of parallel-connected UPS systems using particle swarm method-based hyperbolic sliding mode control strategy is developed. By the use of the Hyperbolic Sliding Mode Control (HSMC), the AC output voltage regulation and balanced current-sharing among the parallel modules can be achieved. However, the chattering phenomenon still exists in HSMC and will cause heat losses and high voltage harmonics in UPS systems. To remarkably attenuate the chattering, a particle swarm method is used to optimally design the HSMC system. With the proposed strategy, the robustness of the UPS system is enhanced, and a high-quality UPS sinusoidal output voltage with low voltage harmonics and fast dynamic response can be obtained even under large parameter variations. Experiments are performed to testify the proposed strategy.

Index Terms—Hyperbolic Sliding Mode Control (HSMC), chattering, particle swarm method, UPS system, voltage harmonics

Cite: En-Chih Chang, Rong-Ching Wu, Pei-Shan Wang, and Kuo-Yuan Liao, "Particle Swarm Method-Based Hyperbolic Sliding Mode Control Strategy for the Optimal Design of Parallel-Connected UPS Systems," International Journal of Electrical Energy, Vol. 3, No. 4, pp. 271-274, December 2015. doi: 10.18178/ijoee.3.4.271-274

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