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| Author(s): |
Pedro José dos Santos Neto
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Elétrica e de Computação |
| Defense date: | 2021-08-25 |
| Examining board members: |
Ernesto Ruppert Filho;
José Antenor Pomilio;
Marcelo Gradella Villalva;
Rodrigo Padilha Vieira;
Tiago Davi Curi Busarello
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| Advisor: | Ernesto Ruppert Filho |
| Abstract | |
This Ph.D. thesis investigates the operation of two emergent technologies: the DC microgrids integrated into the AC utility grid and the switched reluctance generator (SRG) for application in small wind systems as distributed generation. The approach in this thesis is the study of the power management inside the DC microgrid, considering the bidirectional power flow established by the renewable energy resource, local loads, energy storage system, and the microgrid integration to the AC utility grid. The main power management techniques for DC microgrids are benchmarked to base the choice of the control strategy applied to the system under study. A master-follower power management strategy based on virtual inertia is proposed for the energy storage system, which returns to the microgrid increased flexibility and autonomy. In the event of a communication line failure, an adaptive droop strategy is applied as a backup to improve the system's reliability. Another proposal is the SRG performance optimization for wind systems application using the optimal control parameters obtained through the technique called design of computational experiments. The goal is to maximize the generator efficiency and reduce the electromagnetic torque ripple. It is shown that the SRG connection to the microgrid introduces undesired distortion components into the DC bus. These frequency components are propagated to the electric currents injected into the utility grid, thus reducing the system power quality. A bidirectional DC-DC interface converter is used to obtain the SRG optimum performance when connected to the microgrid. Moreover, the interface converter adds a filter functionality to mitigate part of the undesired frequency components. The experimental results presented in this thesis validate the proposed power management applicability. In addition, the obtained results indicate that the SRG wind system using the interface converter returns better performance compared to the conventional direct connection approach (AU) | |
| FAPESP's process: | 17/21087-8 - Study and implementation of the control and the energetic management of a DC microgrid, with wind energy conversion system, using the switched reluctance generator. |
| Grantee: | Pedro Jose dos Santos Neto |
| Support Opportunities: | Scholarships in Brazil - Doctorate |