Abstract:
In this article, we discuss the multimode operation of a photovoltaic (PV) array, a battery, the grid, and a diesel generator (DG) set-based charging station (CS) for the purpose of supplying household loads with continuous charging and uninterruptible supply respectively.
In this CS, a single voltage source converter operates the CS in an islanded mode, the grid connected mode and the DG set connected mode (DGM) and performs various tasks, such as power management among different energy sources and charging the electric vehicles (EVs), extraction of maximum power from the PV array, the regulation of voltage and frequency of the generator, harmonics current compensation of nonlinear loads and intentional reactive power compensation.
An array of photovoltaic cells and a storage battery are the primary sources of electricity that are utilized by the charging station (CS) control system. Because these two sources are not available, the charging station draws its electricity from the grid. Finally, it makes use of a DG set that is based on a squirrel cage induction generator.
On the other hand, the DG set is managed in such a way that it generates up to 33 percent more power than its rated capacity without exceeding the rated current in windings. As a result, the size of the DG is condensed.
Furthermore, the generator’s voltage and frequency are regulated at their rated values with no mechanical speed governor present. This is a significant advantage. The CS is able to achieve a total harmonic distortion of voltage and current that is less than 5% across all working modes, ensuring that it complies with the IEEE 1547 benchmark.
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