Analysis and Design of Single-Phase Photovoltaic Grid-Connected Inverter
Jaehwe Shim Department of Embedded SW
Graduate School, Kwangwoon University Seoul, Korea
Abstract
This paper proposed a new maximum power point tracking(MPPT) algorithm to find true maximum power point(MPP) for mismatched PV(Photovoltaic) modules. And also, various anti-islanding algorithms for grid-connected PV system were analyzed comparatively. At first, in order to have PV PCS maximum power generation efficiency, maximum power point trackers are used to operate a solar PV panel at its MPP. A number of MPPT algorithms has been used in the past such as P&O, IncCond, etc. But these algorithm cannot track true maximum power point under mismatched PV modules caused by clouds, shadow, and snow. The multiple local maxima can be existed on PV characteristic curve under mismatched PV modules. Therefore, the proposed MPPT algorithm, which is capable of tracking the true MPP under mismatched PV, is verified by simulation and experiment. In addition, this paper covered various anti-islanding methods for distributed grid-connected PV PCS. The islanding is that the phenomenon wherein the distributed PV PCS does not detect the interruption due to the power failures and faults, but dose continue operation. Islanding phenomenon can cause to have maintenance engineer in danger and to have application load damaged. Therefore grid-connected PV PCS must be disconnected while detecting the islanding phenomenon within the specified time, which secures safety and reliability. In this paper past various anti-islanding algorithms were explained and verified validity comparatively. For the validity of the proposed MPPT algorithm, 3kW PV system was designed with connected PV simulator.
LINK
http://www.mediafire.com/file/zxhzxcphv8p7la1/Analysis_and_Design_of_Single_Phase_Photovoltaic_Grid_Connected_Inverter.pdf
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