Reduction of energy losses achieved by an optimal reactive power generation in photovoltaic systems installed inside a low voltage distribution network

Abstract

This paper deals with the evaluation of electrical energy savings in a low voltage distribution network, gathered by reduced energy losses. The latter is achieved by optimal reactive power generation of photovoltaic (PV) systems, where losses in the low voltage network and distribution transformer are taken into consideration. The energy savings are determined for three typical low voltage networks: urban, rural and rural with long distance LV lines. In the discussed networks PV systems are installed. The study of network electrical energy savings is performed for smaller PV systems with 5 kWp per unit and for larger units, all for the same total PV power installed in the network. The results shows, that significant electrical energy savings can be achieved in networks, where PV systems are installed away from the transformer station or smaller PV systems are installed at sites, where consumption is present.