Browsing by Author "Avila, Victor Habermann"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- Control and quality analysis of grid connected inverters output currentPublication . Avila, Victor Habermann; Leite, Vicente; Gules, RogerWith the expansion of the use of renewable energies to generate electricity, the global energy matrix tends to become more sustainable. The inverter is an essential part of an electricity generation system from renewable sources, it interfaces between the system and the electrical network, supplying power to the grid or feeding the household loads. As a result, the number of inverters connected to the grid has become increasingly larger, with the possibility of injecting current with harmonic components in the system. So that this does not affect the normal operation of the distribution system, some regulations were created defining energy quality parameters to be respected. Therefore, the objective of this dissertation is to study and experimentally validate some techniques for controlling the output current of an inverter and output filter topologies, analyzing the impact of these components on the quality of the injected current. The converter model, as well as the control strategies and the output filters were validated through a simulation in Simulink / MATLAB. For the experimental tests, a power structure of a DC-AC converter previously used in the LSE was used, which consists of a simple topology of a DC-DC converter and a complete bridge inverter. For the control of the platform the dSPACE system was used, which allows a simple programming of the control structure, as well as the acquisition and processing of the test data. The objective of this dissertation was achieved, obtaining results that present the quality of the injected current under different test conditions and system configurations. The resonant proportional control with harmonic compensation showed better results in the nominal power, but the other applied strategies also proved to be valid for some applications.
- Control of grid-connected inverter output current: a practical reviewPublication . Avila, Victor Habermann; Leite, VicenteThe number of grid-connected inverters is growing due to the expansion of the use of renewable energies (RE) systems and this may affect grid power quality and stability. Some control algorithms reduce injected current harmonics and add new possibilities to the converter. This paper implements and analyses the proportional integral (PI) controller in the synchronous frame and the proportional resonant (PR) controller with and without the harmonics compensators (HC). All these control strategies have proven to be effective and robust. However, the PR+HC controller presents better output current quality. The PI and PR controllers have similar performances. This work also compares the harmonic content of the current with the IEEE 1547 reference and with three commercial inverters from different manufacturers.