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A single-phase photovoltaic Microinverter topology based on boost converter DOI:10.15199/48.2019.04.40

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In recent years, the grid-connected photovoltaic systems have attracted considerable interest in view of a crucial effect on improving their energy efficiency and reliability. With this in view, much research has focused on reducing costs and improving performance by modifying the power circuit topologies and the controller structures. In other words, the configuration of the photovoltaic panels and the right choice of the inverter have a direct influence on the cost and the efficiency of the whole system. On the market, there are three distinct types of photovoltaic systems: Type1- large-scale photovoltaic systems (generating several Megawatts) in regions with high solar insulation, Type 2- medium-scale PV systems (generating from one tenth to one hundredth of kilowatts), mainly for professional use and finally, Type 3- decentralized grid-connected photovoltaic systems on a small scale, such as photovoltaic structures based on Microinverters involved in small residential applications [1-3]. In Type 3, individual Microinverter connects a PV panel directly to the grid, adjusted to the maximum power thanks to an electronic tracker of this maximum point. Within this technological solution, the Maximum Power Point Tracker, MPPT [4, 5] allowing efficiency and improvement of the system reliability by eliminating the potential single point of failure [1, 6]. To this end in type 3 topology, photovoltaic Microinverters are the subject of extensive researches in academia and industry laboratories. Two important parameters in the design of Microinverters are considered, which are the quality of the injected signal into the grid and the sizing of the converter. In the scope of this work, a compromise between the size of the Microinverter and the switching frequency need to be found. However, to maintain or improve efficiency at higher switching frequencies, advanced topologies and control strategies are needed [6-7]. Improving the M[...]

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