Executive Summary : | The power distribution system is equipped with various kinds of loads based on the requirements of the end user. These loads are categorized into various types based on the power consumption characteristics. The electrical supply system will deliver good quality of power in the presence linear loads. However, non-linear loads will draw harmonic content from the supply which in turn need to be taken care so as maintain grid standards. The category of loads which involves alternating to unidirectional conversion stage namely, storage systems, electrical vehicle (EV) charging, rectifier loads, mobile laptops and personal computers etc., are usually considered as non-linear loads as it draws harmonic content from the electrical supply. The problem of power quality and the criteria of fulfilling grid standards can be addressed by placing shunt active power filter across the load which delivers the required harmonic content to the load. As a result, the current drawn from the supply will be pure sinusoidal. The intention of the project is to find the efficient way of delivering power to the non-linear load through a solar interfaced three phase inverter with the facilitation of power quality support and grid energy exchange against increasing penetration of EV charging stations. Here, the inverter is supported with both the photo-voltaic (PV) system as well as the utility grid. As the power from the PV source is uncertain, the deficit and surplus powers will be managed through energy exchange with the utility grid. The possible configurations of the proposed solar interfaced device are; 1. Bi-directional exchange of active power and harmonics required by the load 2. Reactive power and harmonic requirements of the load in the absence of PV generation 3. Active power injection from PV to grid in the absence of non-linear load 4. Active power and harmonic requirement of load in the absence of grid and sufficient PV generation Hence, in this work an appropriate and enhanced control of solar interfaced power quality device would be proposed to meet the aforementioned requirements. The work includes, modeling or mathematical representation of the system, design and implementation of control methodologies along with hardware development and validation. |