Study On Efficiency Control Techniques In PV Generation Syetem

With the development of photovoltaic (PV) technologies, applications of photovoltaic have grownrapidly, indicating that the photovoltaic are attractive to produce environmentally benign electricity fordiversified purposes. In order to maximize the use of solar energy, this thesis focuses on the PV powergeneration systems, which includes modeling of PV systems, maximum power point tracking (MPPT)methods for PV arrays.The model of PV arrays is the base of research on PV systems. This thesis presents simulation modelof PV arrays based on the output characteristics formulas. It can be directly applied in circuit simulationand system analysis.Maximum Power Point Tracking (MPPT) method is an important means to improve the systemefficiency of PV power generation system. MPPT theory and various MPPT algorithms are introduced inthe literature. Furthermore, this article analyzes the principle of Boost circuit and impedancetransformation characteristic in stand-alone PV system with MPPT technology applications. Thesimulation study of Boost circuit applied in the MPPT is completed based on Simulink simulation model.Based on those researches, this thesis proposes a novel implementation of an adaptive duty cycle P&Oalgorithm that can reduce the main drawbacks commonly related to the traditional P&O method, at thesame time,the simulation results verify that the novel MPPT algorithm can track PV array‘s MPP efficient,even under the circumstance of isolation level, ambient temperature changing rapidly.