QUALIDADE DA ENERGIA ELÉTRICA EM UMA MICRORREDE TRIFÁSICA ISOLADA FORMADA POR INVERSORES BIDIRECIONAIS AGREGANDO GERAÇÃO FOTOVOLTAICA DISTRIBUÍDA

Abstract

This work evaluates the quality of the electricity supply in an isolated experimental microgeneration system, not connected to the conventional grid. The system uses bidirectional inverters that form the three-phase electricity grid, integrates photovoltaic generation on the system's DC and AC buses; an electricity distribution microgrid, serving several consumer units (CUs) with loads controlled to emulate a demand with a typical residential profile (Consumer Units - CUs). It also includes energy storage using batteries and photovoltaic generators connected to grid-tie inverters distributed across the microgrid. The study deals with and analyzes data from practical tests in two scenarios: with and without distributed photovoltaic generation, using indicators and limits defined by ANEEL's PRODIST. To assess power quality, indicators, limits and reference values defined by Module 8 of ANEEL's PRODIST were considered. It should be noted that events and disturbances were identified during operations, resulting in proposals for improvements, such as the addition of DGs near the consumer units at the end of the microgrid to reduce dependence on other subsystems and minimize frequency variations caused by the inverters.