Performance Enhancement of Low Voltage Distribution Network by Optimal Inverter Control of Solar PV System

Abstract

The thesis highlights the increasing contribution and impact of grid-connected photovoltaic (GCPV) systems, a type of renewable energy source, in electrical distribution systems. GCPV systems offer several advantages to customers and distribution network utilities. They enable consumers to fulfill their own electricity demand, reduce electricity bills, and even feed surplus power back into the grid. Additionally, GCPV systems can act as backup systems when there is insufficient or no PV generation. The increasing number of network-connected PV inverters also allows for their usage as Volt Ampere Reactive Compensators, which can regulate distribution network voltage and eliminate the need for expensive compensation devices like capacitor banks. However, introducing a large number of small-scale rooftop gridconnected PV systems with varying ratings into the distribution network can lead to technical challenges. One major problem is the voltage rise along the distribution network, causing reverse power flow, especially during low power demand and high PV generation conditions. This voltage rise limits the network's ability to accommodate more PV connections. Another issue is the possibility of voltage drop along the network during periods of no PV generation, particularly when there is high power demand and no PV generation.