Modelagem e controle de funções auxiliares em inversores inteligentes para suporte a microrredes CA - simulação em tempo real com controle hardware in the loop

Abstract

Distributed Generation technologies generally consist of modular (mostly renewa-ble) generators that offer a number of potential benefits, while being closer to the end consumers. Although the DG present features as commented, the insertion of renewa-ble energies in the electrical network can affect the protection and also the stability of the network, implying in voltage and frequency deviations. One of the main problems faced is the lack of inertia of renewable energies and also the appearance of harmonic currents due to non-linear loads. Based on this scenario, and as a way of solving these problems, the research of smart inverters, capable of not only connecting such renewable energies to the electric grid but also supporting it, emerges. Some ancillary services as voltage and frequency stability, mitigation of harmonic content, balance of generation and energy demand, among other aspects, can be fullfilled. Thus, methodologies based on sophisticated control implementations such as the Virtual Synchronous Machine and the Active Power Filter, can be adopted as solutions to these problems. In this aspect, real-time simulations with Control Hardware In The Loop HIL in Real Time Digital Simulator RTDS and dSPACE, are a powerfulls tool can aid the simulation process of the analyzed ancillary functions. Thus, in this work, the multifunctional inverter was simulated as a way to show the effective regulation of voltage, frequency, and harmonic content mitigation in power systems, especially in AC microgrids. Finally, the results demonstrate the operation of the system and can be used as validation of the proposed control strategies.