Metodologia para representação de sistemas de transmissão em corrente contínua multiterminais no problema de fluxo de potência

Abstract

High Voltage Direct Current (HVDC) technology has characteristics that make it especially attractive for certain transmission applications. Furthermore, it is possible to notice that there is a trend and prospect of increased use of this technology in Electric Power Systems around the world. In this context, it has been increasingly important to have techniques that efficiently include these equipment models in network analysis programs, especially in power flow, in order to allow a correct modeling of the network in studies of expansion planning and operation. The direct current transmission is becoming widely recognized by their advantages in transporting large blocks of power over long distances, to transport power from offshore wind farms to land, in asynchronous interconnection of systems, in underwater crossings, and other issues that make it technically and economically feasible in some situations. In this context, this thesis has the objective to develop and implement a generic methodology for the representation of HVDC Multi-Terminal Systems in the power flow problem. In this sense, this methodology is based on the simultaneous solution of a system of nonlinear equations that represent, in steady state studies, the DC and AC networks, using the Newton-Raphson method to solve the problem. Equations that represent the steady state response of the converters, the DC network and control strategies are presented. In addition, it will be presented the main settings of HVDC converters, their characteristics and how their modelling are set forth in the Power Flow problem. The proposed methodology is validated by studying tutorial and test systems found in the literature. The results show that the proposed methodology is able to represent satisfactorily models of HVDC Multi-Terminal Systems in studies of steady state in Electric Power Systems.