저 일사량 조건에서 Power to Heat 시스템의 최대전력점 추적 성능 개선에 관한 연구 = Study on Improving MPPT Performance of Power to Heat System in Low Solar Irradiance Conditions

다국어 초록 (Multilingual Abstract)

Recently, RE100 has been discussed worldwide to reduce the use of fossil fuels and switch to renewable energy to achieve carbon neutrality. To address the variability and intermittent generation characteristic of renewable energy source, the concept of Power to Heat (P2H) has been proposed. P2H aims to convert surplus electricity into heat energy. The Photovoltaic (PV) power generation system supplies P2H system's power. The PV generation system's the maximum power point changes non-linearly depending on solar irradiance, load, and series-parallel connection of PV modules. By changing the series-parallel connection of the PV module, PV module’s resistance can be changed and improving the Maximum Power Point Tracking (MPPT) performance according to changes in solar irradiance. Cosideration of the delay between the voltage and current sensors and the control board, and the charging time of the input capacitor is necessary to MPPT control. PV power efficiency and MPPT performance may decrease in low irradiance conditions then research into improving MPPT performance is necessary. In this study proposed a method changing the series-parallel connection of PV modules to compensate for MPPT performance in low solar irradiance conditions. Through simulation and experiment verified the feasibility of improving the MPPT performance of the P2H system in low solar radiation conditions by changing the series and parallel connections of solar modules.

목차 (Table of Contents)

• 제 1장 서론 ·································································································1
• 1.1 연구 배경 및 필요성 ··················································································· 1
• 1.2 연구 동향 ······································································································· 3
• 1.3 연구의 내용 및 목적 ··················································································· 4
• 제 2장 태양광 발전 시스템 ··································································5
• 2.1 태양전지 모델링 ··························································································· 5
• 2.2 온도와 일사량에 따른 태양광 모듈 특성 ··············································· 8
• 2.3 직·병렬 연결에 따른 태양광 모듈 특성 ··············································· 10
• 2.4 최대전력점 추적 제어 ··············································································· 11
• 제 3장 N-Buck 컨버터 ·········································································15
• 3.1 N-Buck 컨버터 개요 ················································································ 15
• 3.2 N-Buck 컨버터 MPPT 추적 영역 ························································ 19
• 제 4장 P2H의 최대전력점 추적 성능 개선 방안 ··························21
• 4.1 제안하는 P2H의 최대전력점 추적 성능 개선 방안 ··························· 21
• 제 5장 P2H 시스템 시뮬레이션 및 실험 ·········································24
• 5.1 P2H 시스템 시뮬레이션 구성 ································································· 24
• 5.2 P2H 시스템 시뮬레이션 결과 ································································· 27
• 5.3 태양광 시뮬레이터를 활용한 P2H 시스템 실험 구성 ······················· 29
• 5.3.1 P2H 실험을 위한 N-Buck 컨버터 구성 및 제작 ··························· 29
• 5.3.2 태양광 시뮬레이터를 활용한 P2H 시스템 실험 구성 ···················· 32
• 5.4 태양광 시뮬레이터를 활용한 P2H 시스템 실험 결과 ······················· 33
• 5.5 P2H 시스템 실험을 위한 테스트 베드 구성 ······································· 35
• 5.6 P2H 시스템 테스트 베드 실험 결과 ····················································· 37
• 제 6장 결론 ·······························································································42
• 참고문헌 ·····································································································43
• 요지 ·············································································································48