Abstract
In two-stage micro-inverter photovoltaic (PV) applications, DC/DC converter is used to obtain the highest DC power from the PV module. In this type of inverter, the rising of voltage from the PV module to a grid voltage level is limited to a certain value. Moreover, the absence of the isolation between the input and output makes it is less efficient. For these reasons, an efficient single-stage grid-tied flyback PV micro-inverter with discontinuous conduction mode (DCM) control strategy is proposed to feed an alternating current (AC) to the main grid with a lower value of the total harmonic distortion (THD). The control strategy is based on a sine sinusoidal pulse width modulation (SPWM) technique to control the main switch of flyback inverter. Also, a simple perturb and observe (P&O) maximum power point tracking (MPPT) technique has been presented to obtain the MPP point from the PV module for any environmental conditions. The proposed control was verified using PSIM software and simulation results is obtained. The proposed control is tested under different weather conditions for solar irradiance and temperature, as a result, a pure sin wave current has been injected into the grid with a lower harmonics value. Finally, the small size, low cost and high reliability of single stage flyback micro-inverter is presented without the need for DC/DC converter.
Highlights
Nowadays, renewable energy is considered the attractive solution to solve most problems in fuel fossil energy
A few numbers of inverters are connected with many number of PV modules. It is more efficient than the string inverter but at the same time it is failing in the shading effects of the PV modules
A lower efficiency is obtained in these inverters due to a one maximum power point tracking (MPPT) technique implemented for all PV modules in the same time
Summary
Renewable energy is considered the attractive solution to solve most problems in fuel fossil energy. Compared with the previous types, the micro-inverters represent an attractive solution for low power applications. It is more expensive than the other inverters, but provides high efficiency and reliability. Flyback micro-inverter [11,12,13,14,15,16] represents a good attractive micro-inverter that is integrated with a single PV module. By incorporating this configuration, the possibilities of operating a system, based on a “plug and play” device. A pure sine wave current is injected to the grid with a low content of THD
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