Reactive Power Flows of Photovoltaic Inverters with a Power FactorRequirement of One

摘要

The generated power of photovoltaic (PV) systems represents a growing part of the electrical energy supply inGermany. At the beginning of 2013, more than 32 GW have been installed [BUR-13]. This leads to new challenges to ensurethe required grid stability. Due to the rapid extension of PV systems, primarily in low voltage grids, the state of the grid isincreasingly unknown. This paper discusses reactive power flows due to PV inverter systems. The focus hereby is on thepower factor (PF) requirement of one. Hence PV inverters should feed only active and no reactive power into the grid. Variousobservations in low voltage grids show a dispersion of the active and apparent power feed in and thus a reactive powerflow. The direction and extend of these reactive power flows are analysed within this paper.