S.U. Ahn

Universidade Federal de Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul, Brazil

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Publications (2)6.5 Total impact

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    ABSTRACT: This paper proposes a novel phase-locked loop (PLL) control strategy to synthesize unit vector using the modified synchronous reference frame (MSRF) instead of the traditional synchronous reference frame. The unit vector is used for vector rotation or inverse rotation in vector-controlled three-phase grid-connected converting equipment. The developed MSRF-PLL is fast in transient response compared to standard PLL technique. The performance is robust against disturbances on the grid, voltage wave with harmonic distortion, and noise. The proposed algorithm has been analyzed in detail and was fully implemented digitally using digital signal processor TMS320F2812. The experimental evaluation of the MSRF-PLL in a shunt active power filter confirms its fast dynamic response, noise immunity, and applicability.
    IEEE Transactions on Industrial Electronics 12/2010; 57(11-57):3814 - 3821. DOI:10.1109/TIE.2010.2040554 · 6.50 Impact Factor
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    ABSTRACT: This paper describes an algorithm to implement a full digital adaptive current hysteresis control. The algorithm can be applied in all types of inverters. The proposed strategy takes care of DC link voltage fluctuations, load parameters variations, and it guaranties constant switching frequency operation keeping the ripple at the smaller possible value. The Fuzzy based algorithm has been developed in such way that no hysteresis-band calculations are needed. The constant switching frequency is important to minimize the power semiconductors losses and to maintain the optimal operation of the output ripple filter. The algorithm is full digitally implemented in DSP and it doesn't need any additional circuits to do the job. It is easy to be programmed, fast and extendable to three-phase applications. Simulation and experimental results have shown the good performance of the algorithm in all practical situations: normal operation, fast load transient, load parameters variation and harmonics follow-up.
    Industry Applications Conference, 2007. 42nd IAS Annual Meeting. Conference Record of the 2007 IEEE; 10/2007