고효율 태양광 모듈집약형 DC/DC 컨버터 시스템 = High Efficiency Photovoltaic Module Integrated DC/DC Converter System

국문 초록 (Abstract)

본 논문에서는 태양광 모듈집약형 시스템의 효율 및 신뢰성 향상을 위한 고효율 DC/DC 컨버터와 최대전력추종(maximum power point tracking) 제어 알고리즘을 제안하였다.
제안된 DC/DC 컨버터는 기존의 위상천이 풀-브릿지 컨버터에 보조 인덕터와 보조 커패시터로 구성된 보조회로를 적용하여 입력 변동과 넓은 부하 범위에 대하여 ZVS 확립을 위한 추가적인 에너지를 주 회로에 공급함으로써 넓은 ZVS 범위를 확보할 수 있게 하였다. 또한 보조회로의 전류가 주 회로에 반영되어 전도손실을 증가 시키기 때문에 이를 최소화시킬 수 있도록 이론적 근거를 제시하였다.
제안된 MPPT 제어 알고리즘은 기존의 P&O(Perturbation & Observation) MPPT 제어 알고리즘의 불필요한 연산 과정과 동특성을 개선하여 기존의 P&O 방식에 비해 신속하고 안정적으로 출력 전압을 얻게 하였다.
제안된 위상천이 풀-브릿지 컨버터 및 MPPT 제어 알고리즘의 이론적인 해석 및 동작 원리를 제시하였으며, 그 타당성을 컴퓨터 시뮬레이션을 통해 입증 하였다.

목차 (Table of Contents)

• 국문 요지 ···························································································· i
• 목차 ···································································································· ii
• 제 1 장 서론 ······················································································ 1
• 1.1 연구 배경 및 필요성 ·································································· 1
• 1.2 연구 내용 및 구성 ·······································································4
• 제 2 장 위상천이 풀-브릿지 컨버터 ···············································6
• 2.1 기존의 위상천이 풀-브릿지 컨버터 ·········································6
• 2.2 제안된 위상천이 풀-브릿지 컨버터 ·······································10
• 2.3 정상상태 해석 ············································································11
• 2.4 보조회로 설계시 고려사항 ······················································18
• 제 3 장 최대전력추종제어 ······························································20
• 3.1 P&O(Perturbation & Observation) ·······································21
• 3.2 IncCond(Incremental Conductance) ··································22
• 3.3제안된 최대전력추종 제어 알고리즘 ······································24
• 제 4 장 시뮬레이션 및 검토 ···························································26
• 제 5 장 결론 ······················································································33
• 참고 문헌 ··························································································35