Multimode Operation of Solar PV Array, Grid, Battery and Diesel Generator Set Based EV Charging Station

In this project, the multimode operation of a Photo Voltaic (PV) array, a battery, the grid and the Diesel Generator (DG) set based Charging Station (CS) are used for providing the continuous charging and uninterruptible supply to the household loads. In this CS, a single voltage source converter (VSC) operates the CS in an Islanded Mode (IM), the Grid Connected Mode (GCM) 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. 

The control of CS is designed such that it primarily takes power from the PV array and a storage battery. In the absence of these two sources, the charging station takes power from the grid, and at last, it utilizes a squirrel cage induction generator based DG set. However, the DG set is operated such that it generates up to 33% more power than its rated capacity without exceeding the rated current in windings, therefore, the size of the DG is reduced. 

Moreover, the voltage and frequency of the generator are regulated at its rated values without a mechanical speed governor. In all operating modes, the CS complies with the IEEE 1547 standard and the Total Harmonic Distortion (THD) of voltage and current, is achieved less than 5%.

Keywords: Photo Voltaic (PV) array, Diesel Generator, Electric Vehicles, Voltage Source Converter, Islanded Mode, Grid Connected Mode and DG Set Connected Mode (DGM).