Melhoria da resposta transitória em máquinas síncronas virtuais com controle de decaimento auxiliar via filtros de Washout

Abstract

The increasing demand for renewable sources of energy and its insertion in the electric power system has motivated several works in the area of control applied in micrredes. Among the several existing control techniques, the virtual synchronous machine (MSV) has aroused great interest on the part of the researchers in recent years. The MSV consists of controlled power converters in order to emulate, with some fidelity, the dynamics of a real synchronous machine through frequency and ow control loop. In this way, the converters acquire important properties present in real synchronous machines, such as inertia and self-synchronization, contributing to the system's voltage and frequency stability. In this work the MSV known as synchronverter is modified by the addition of controllers by decay curves (or droop control) based on washout filters. The converter currents are improved so as to obtain a better transient response. The time constant design of the washout filters is obtained according to the MSV parameters. A new quantity called quorte, recently introduced in the literature, is used instead of the reactive power to generate the MSV ow. The quorte is related to reactive power in the same way that torque is related to active power. Simulation results are presented to demonstrate the good performance of the proposed control strategy.