Estudo de técnicas de controle coordenado de tensão aplicadas a microgrids em regime permanente

Abstract

For the social and economic development of a country, having an Electric Power System that operates safely and reliably is essential. Such operational conditions, requiring the development at an ever lower cost, have led to the studies needed on the electric energy area and the subsequent improvement of the sector, which have become a support for the organization of the present society. Consequently, with increasing demands, studies were necessary for anticipating the actions which would enable the system to supply the consumers and adapt to new technologies. In this development context, the term “microgrid” emerges as a resource capable of integrating multiple generation units, including loads and power storage systems, capable of operating connected to the main grid or operating in an autonomous way, maintaining the required safety and reliability standards in electrical systems. From this context, the main objective of this research work will be to present the joint modeling of the Coordinated Voltage Control and of inverters with control system in droop through the insertion of new equations to the power flow problem solved by the Full Newton Method. In addition, through this modeling, it will be possible to calculate the behavior of the reference voltage value V0 of the controllers. For validation of the proposed methodology, results are obtained in two microgrids, the 38 bus system, and the U.K. GDS EHV1 network. These results are compared to those obtained by the ANAREDE program, which is widely used in the steady-state analysis of power systems in the Brazilian electricity sector. Steady-state control schemes are proposed, and gains are obtained in terms of reduction of electrical losses, increasing the loading margin and decrease of the variability of the voltage profile.