This paper presents a novel grid-connected photovoltaic Microinverter topology and its control implementation. A very significant contribution is to propose an innovative conversion structure with the aim of achieving high efficiency, easy control, high reliability and low design cost. In a first part of this contribution, we describe the proposed configuration topology. In a second part, we present the simulation tests developed in order to verify the validity and performance of its operating principle. The last part is reserved for discussion of the simulation results
Słowa kluczowe: Photovoltaic Microinverter, Boost converter, PWM control, grid-connected
W artykule opisano topologię mikroprzekształtnika współpracującego z ogniwem fotowoltaicznym. Zaproponowano nową koncepcję konwersji dla osiągnięcia prostego sterowania I małego kosztu. W pierwszej części opisano układ, w drugiej części przedstawiono wyniki symulacji a w trzeciej dyskusję wyników.
Keywords: przekształtnik typu boost, ogniwo fotowoltaiczne
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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