Estudo de caso sobre comportamento de uma minigeração em um circuito com cargas desequilibradas

Abstract

The exploration of renewable sources interconnected with the electric power system, called distributed generation, shows an increasingly interesting market, with good profitability, managed subsidies and based on sustainability concepts. Currently in Brazil, there has been a significant growth in the number of consumer units connected to the electricity distribution system and generating their own energy. The National Electric Energy Agency - ANEEL regulates the access of energy producers to the distribution system through PRODIST Module 3, for low, medium and high voltage connections. The popularization of distributed generation and its connection to a conventional distribution system, which is usually based on one-way power supply (from the source to the load) has brought with it changes in the way the electrical system is viewed in its operation and maintenance, consequently in the perception of customers about the quality of the service provided. It's necessary to debate constantly about the rational an safe use because we're facing a new reality which has caused changes in the energy distribution business, both in planning expansion and in real time operations. The ANEEL has been debating a lot on this topic with the purpose of promoting rational use and the safety of customers and workers who interact with the electric power system. Another aspect discussed are the concerns on the economic balance of the distributors. Many companies have claimed lost revenue and in some cases increased operating and maintenance costs. This study presents the impacts of connecting a new power supply to a three-phase medium voltage circuit with unbalanced loads, the impact on the quality of the electricity supply to the customer as well as the solutions implemented involving the coordination of protection, rebalancingthe circuits to the installation of a grounding reactor.