Power Flow Solution of Power Networks with Photovoltaic Generation and a Battery Energy Storage System

This paper addresses the computation of the power flow solution of power networks with photovoltaic (PV) generation and energy storage devices. The PV model implemented in this work provides the steady state solution taking into account meteorological conditions. This model is validated with field measurements recorded at a PV installation consisting of monocrystalline solar PV panels. A battery storage system (BESS) based on a lithium-ion battery storage device is used to balance power generation of the PV renewable source. Furthermore, the power flow analysis is carried out for a 5-node benchmark power system using PSS/E software package. Results indicate that the active and reactive power losses can be reduced approximately to 60% of the base case when a PV system is connected to the power grid. However, the voltage deviation index and the loading of the transmission line connected to the point of common coupling increase up to 60%. In contrast, simulation results show that the operation of a BESS helps to reduce power losses and line loading in about 30% and 40%, respectively, while the voltage deviation increases in only 20% with respect to the base case.