Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Performance Analysis of MPPT Techniques Based on Fuzzy Logic and P&O Algorithm in Actual Weather Environment

실제 날씨 환경에서 퍼지로직과 P&O 제어방식의 MPPT 동작 성능 분석

  • Eom, Hyun-Sang (Department of Mechanical and Control Engineering, Handong Global University) ;
  • Yang, Hye-Ji (Department of Mechanical and Control Engineering, Handong Global University) ;
  • An, Hyun-Jun (Department of Mechanical and Control Engineering, Handong Global University) ;
  • Kwon, Youngsung (Department of Mechanical and Control Engineering, Handong Global University)
  • 엄현상 (한동대학교 기계제어공학부) ;
  • 양혜지 (한동대학교 기계제어공학부) ;
  • 안현준 (한동대학교 기계제어공학부) ;
  • 권용성 (한동대학교 기계제어공학부)
  • Received : 2020.06.26
  • Accepted : 2020.10.05
  • Published : 2020.10.31
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Abstract

The power generation of a PV system changes according to the weather variables, such as solar radiation and temperature. In particular, the output characteristics of photovoltaic systems, which are sensitive to changes in solar radiation, can be produced effectively and reliably in various weather conditions through MPPT (Maximum Power Point Tracking) control. This paper proposes a fuzzy-based MPPT control method to improve the efficiency and stability of the power production from a solar system. To verify the performance of the proposed method, under the same weather environment, the efficiency and stability of the newly proposed fuzzy logic were compared and evaluated empirically with P&O (Perturb and Observe), a representative algorithm of MPPT control. Furthermore, the circuits designed to improve the reliability and reliability of the hardware were manufactured from Printed Circuit Boards (PCB) to conduct experiments. Based on the results of the experiment during a certain period, the fuzzy-based MPPT proposed in this paper improved the efficiency by more than 4.4% compared to the MPPT based on the existing P&O algorithm and decreased the fluctuation width by more than 39.7% at the maximum power point.

태양광(PV, Photovoltaic) 시스템의 발전량은 일사량 및 기온 등 날씨 변수에 따라 변동한다. 특히 일사량 변화에 민감하게 반응하는 PV 시스템의 출력 특성은 최대 전력 점 추적(MPPT, Maximum Power Point Tracking) 제어를 통해 변화하는 기상 환경에서도 효율적이며 안정적으로 최대 전력을 생산할 수 있다. 본 논문에서는 PV 시스템의 전력생산 효율 개선과 안정성을 높이기 위해 퍼지 로직 기반의 MPPT 제어 방법을 제안한다. 제안한 방법의 성능 검증을 위해, 동일 기상 조건하에서 기존의 대표적인 MPPT 제어방식인 P&O(Perturb and Observe)와 새로 제안한 퍼지 로직의 효율과 안정성을 실증적으로 비교 및 평가한다. 더욱이 하드웨어의 안정도 및 신뢰도 향상을 위해 설계한 회로를 인쇄 회로 기판(PCB, Printed Circuit Board)으로 제작하여 실험을 진행했다. 특정 기간동안 prototype으로 진행한 실험 결과를 통해, 본 논문에서 제안한 퍼지 로직 기반의 MPPT가 기존의 P&O MPPT 대비 4.4% 이상의 효율 개선과, 최대 전력 점에서 변동 폭의 39.7% 이상 감소가 확인된다.

Keywords

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