Análise dos Impactos do Controle de Potência Reativa na Capacidade de Acomodação de Geradores Distribuídos de Redes de Distribuição

Abstract

The increased integration of photovoltaic (PV) systems to distribution networks can cause several problems for the system operator. If the distributed generation hosting capacity (DGHC) of the network is exceeded, some power quality limits, such as reverse power flow in substation, undervoltage and overvoltage, will also be exceeded. The reactive power control of grid-interface inverters associated with the distributed generation (DG) can be a solution to this problem since it allows the maximization of the network DGHC. In this paper, an analysis of the impacts of the inverters reactive power on DGHC of the IEEE 33 bus test system is presented. Four cases are tested: all inverters with unity power factor; all inverters with inductive minimum power factor; all inverters with capacitive minimum power factor and inverters with variable power factors adjusted by Volt-VAr control. The power factor limits are based on the Standard IEEE 1547-2018. The Monte Carlo Simulation (MCS) was adopted to consider the uncertainties associated with the PV locations and the irradiance and load profile. From the results, it is concluded that the use of Volt-VAr control as a programmed function in the inverters allows the minimization of the problems of voltage regulation and reverse power flow.