The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Optimum Control Period and Perturbation Voltage for PV-MPPT Controller Considering Real Wether Condition

실제 날씨를 고려한 PV-MPPT 제어기의 최적 주기와 변량전압

  • Ryu, Danbi (Dept. of Electrical, Electronic and Control Eng., Kongju National University) ;
  • Kim, Yong-Jung (Dept. of Electrical, Electronic and Control Eng., Kongju National University) ;
  • Kim, Hyosung (Div. of Electrical, Electronic and Control Eng., Kongju National University)
  • Received : 2019.08.28
  • Accepted : 2019.10.28
  • Published : 2020.02.20
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Abstract

Solar power generation systems require maximum power point tracking (MPPT) control to operate PV panels at their maximum power point (MPP). Most conventional MPPT algorithms are based on the slope-tracking concept. A typical slope-tracking method is the perturb and observe (P&O) algorithm. The P&O algorithm measures the current and voltage of a PV panel to find the operating point of the voltage at which the calculated power is maximized. However, the measurement error of the sensor causes irregularity in the calculation of the generated power and voltage control. This irregularity leads to the problem of not finding the correct MPP operating point. In this work, the power output of a PV panel based on the P&O algorithm is simulated by considering the insolation profiles from typical clear and cloudy weather conditions and the errors of current and voltage sensors. Simulation analysis suggests the optimal control period and perturbation voltage of MPPT to maximize its target efficiency under real weather conditions with sensor tolerance.

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References

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