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PV Mismatch 보상을 위한 N-벅 컨버터 기반의 PV 옵티마이저 회로 설계
이정준(Jeong-Jun Lee),강선희(Seon-Heui Kang),박광우(Kwang-Woo Park),강건민(Geon-Min Kang),소순열(Soon-Youl So),김창선(Chang-Sun Kim) 대한전기학회 2021 전기학회논문지 P Vol.70 No.2
The PV optimizer compensates the power loss due to the mismatch of PV panels. The solar power efficiency of PV panels can be increased by using the PV optimizer. Several topology can be considered for PV optimizer but the N-Buck converter is chosen for specific environment. And in this paper, it is considered for N-Buck converter design for PV optimizer. The PV optimizer is used as a power compensator between the PV module and the inverter. Each element of the N-Buck converter circuit is designed and selected by the analyzed formulas and the design conditions. As a result, we can confirm that the design is optimized through PSIM simulation and experiments.
PV Mismatch 보상용 PV Optimizer MPPT 제어 알고리즘 설계
고길용(Gil-Yong Go),박광우(Kwang-Woo Park),강건민(Geon-Min Kang),김창선(Chang-Sun Kim) 대한전기학회 2021 전기학회논문지 P Vol.70 No.1
This paper includes on the development of a PV Optimizer. The PV optimizer is designed as an MIC (Module Integrated Converter) using P&O algorithm to track a maximum power point. It compensates the power loss from mismatch of the panels. The mismatch occurs due to partial shading because of clouds or other environment conditions in PV panel with serial string structure. The PV optimizer can be operated as a buck converter. The buck converter operation range is limited by its MPPT operational characteristics. The Maximum Power Point Tracking (MPPT) is also controlled under the mismatch using the developed embedded program. Using the PV Simulator and TerraSAS program, It is experimented under a situation that solar radiation rapdly changes due to partial shading. It is verified that the developed PV Optimizer increases the power efficiency to about 20% and the MPPT efficiency is measured up to 99.87%.