Sizing of photovoltaic distributed generators in a distribution system with consideration of solar radiation and harmonic distortion

Abstract

This dissertation presents a probabilistic approach to calculate an optimal size of photovoltaic distributed generators (PV-DGs) in a distribution system with consideration of solar radiation and harmonic distortion. Monte Carlo simulation is applied to predict solar radiations, ambient temperatures, substation voltages and load demands. The formulated objective function is to minimize average real power loss, while power quality constraints i.e., node voltage, harmonic current, total harmonic distortion voltage and total demand distortion are kept within the limits complied with IEC and IEEE standards. Existing background harmonics are included in an evaluation of the optimal size of PV-DG. In addition, static voltage stability index analysis is proposed to select a proper location of PV-DG installation in a distribution system. Furthermore, impacts of static load models and power factor control on optimal PV-DG sizing as well as effects of PV inverter modeling and existing DGs in a distribution system are taken into account. The developed method can be applied to actual systems and was tested with a 33-Bus test system and an actual 51-Bus radial distribution system in Thailand.