Study on Voltage Profile and Power Losses of Distributed Photovoltaics Systems Integrated into a Local Distribution Grid in Vietnam

Abstract

In recent years, the integration of renewable energy into power grid has gained prominence among researchers and scientists due to the growing energy demand and the depletion of fossil fuels. This paper would analyse the Huong Khe 35-kV medium voltage distribution network, in which 373E18.8 and 374E18.8 feeders are selected, to study the effects of the distributed Photovoltaics (PV) systems on the voltage quality and power losses on the grid such as overvoltage, reverse power, and increased power loss. The simulation results might solve the voltage quality and power loss problems. In addition, the results of different scenarios are examined. Using the Electrical Transient and Analysis Program (ETAP) software, we discussed how PV plants affected each scenario's voltage profile and power losses in the feeders. This study then provides solutions for those challenges using tap-changers of the substation from 37.5 kV to 36.5 kV and curtailment. Therefore, both the voltage quality and power loss problems have been solved.