Abstract
The single-stage flyback Photovoltaic (PV) micro-inverter is considered as a simple and small in size topology but requires expensive digital microcontrollers such as Field-Programmable Gate Array (FPGA) or Digital Signal Processor (DSP) to increase the system efficiency, this would increase the cost of the overall system. To solve this problem, based on a single-stage flyback structure, this paper proposed a low cost and simple analog-digital control scheme. This control scheme is implemented using a low cost ATMega microcontroller built in the Arduino Uno board and some analog operational amplifiers. First, the single-stage flyback topology is analyzed theoretically and then the design consideration is obtained. Second, a 120 W prototype was developed in the laboratory to validate the proposed control. To prove the effectiveness of this control, we compared the cost price, overall system efficiency, and THD values of the proposed results with the results obtained by the literature. So, a low system component, single power stage, cheap control scheme, and decent efficiency are achieved by the proposed system. Finally, the experimental results present that the proposed system has a maximum efficiency of 91%, with good values of the total harmonic distortion (THD) compared to the results of other authors.
Highlights
In renewable energy systems based on solar energy, Photovoltaic modules are the interface with the primary energy [3,4,5]
PV modules are a key element in energy conversion, they will often be looked at as just a source of electrical energy
We propose a simple and low cost analog-digital control scheme for the single-stage flyback
Summary
Renewable energy sources such as solar and wind, which are environmentally clean and free, have been receiving strong attention and emphasis throughout the world [1,2]. In renewable energy systems based on solar energy, Photovoltaic modules are the interface with the primary energy [3,4,5]. PV modules are a key element in energy conversion, they will often be looked at as just a source of electrical energy. Over an electrical energy source, they have a peculiar behavior related to solar irradiance and temperature [6]. A PV module does not contain any moving parts, as opposed to some of the other renewable energy sources such as wind. More and more complex PV modules are studied for the designing and implementation of efficient PV system strategies [7,8,9,10]
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