Journal of the Korean Institute of Illuminating and Electrical Installation Engineers (조명전기설비학회논문지)

The Korean Institute of IIIuminating and Electrical Installation Engineers (한국조명전기설비학회)
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MPPT Control of Photovoltaic using VS-PO Method

VS-PO 방법을 이용한 태양광 발전의 MPPT 제어

  • Ko, Jae-Sub (Dept. of Electrical Control Engineering, Sunchon National University) ;
  • Chung, Dong-Hwa (Dept. of Electrical Control Engineering, Sunchon National University)
  • Received : 2014.09.23
  • Accepted : 2015.02.09
  • Published : 2015.03.31
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Abstract

A I-V and P-V characteristic of solar cell is changed to nonlinear by radiation and temperature. Therefore, to use efficiently PV system, operating point of PV system is must operate at maximum power point always. A performance of conventional the PO and the IC method is depend on the step size. So it has weakness which is must select optimal step size. Also, MPPT control applying PI and fuzzy control is not expected satisfactory performance, because of PI controller has fixed gain and fuzzy control has cumulative error by an integral calculus. Therefore, this paper proposes the VS-PO(Variable Stepsize - Perturbation & Observation) MPPT control that is automatically adjusted the step size according to the operating conditions. The VS-PO MPPT method proposed in this paper analyzes control characteristic about condition of radiation and compares with conventional methods. The validity of this paper proves using this results.

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References

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