Abstract
In the field of photovoltaic (PV) plants and energy conversion from renewable sources, a large part of the technical literature is more devoted to practical aspects (new solar cells, electrically driven PV panels, safety, reduction of parasitic currents, etc.) than to theoretical investigations. Despite this tendency, this paper presents a mathematical analysis of a medium scale photovoltaic power generation system connected to the distribution network and of its control system. In such a system, the conversion stage is unique due to the absence of a boost chopper. The conducted analysis leads to the interesting conclusion that the inverter used in the plant presents two degrees of freedom, easy to exploit in a control system in which the inverter simultaneously realizes the interconnection to the grid and the MPPT control. The structure of the control system is then presented, discussed and validated by means of numerical simulations.
Highlights
Since photovoltaic (PV) installed power increases all over the world, solar technology is strongly present in the electricity market, and it cannot be seen only as a vision of the future
This paper presents an analytical and numerical investigation on a medium scale PV power generator connected to an active network with its power flow and MPPT control system
This paper has presented a comprehensive analysis of a power generation system from PV source
Summary
Since photovoltaic (PV) installed power increases all over the world, solar technology is strongly present in the electricity market, and it cannot be seen only as a vision of the future. A boost chopper is used to follow the maximum power point, while inverters are used only to adjust voltages and currents to meet the load/grid requirements [18,19,20,21]. This paper presents an analytical and numerical investigation on a medium scale PV power generator connected to an active network with its power flow and MPPT control system. The analysis here shows that the inverter presents two degrees of freedom These two degrees of freedom consist in two control variables, the direct and the quadrature line axis current components, which can be profitably utilized to control the active power, the reactive power and the MPPT at the same time
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