Banca de DEFESA: THIAGO FIGUEIREDO DO NASCIMENTO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : THIAGO FIGUEIREDO DO NASCIMENTO
DATE: 28/08/2026
TIME: 09:00
LOCAL: Auditoria do LAMP
TITLE:

Contributions to Virtual Synchronous Generator Control Applied to Grid-Connected Distributed Generation Systems.

KEY WORDS:

Adaptive Control, Distributed generation, power control, renewable energy sources

PAGES: 70
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUBÁREA: Eletrônica Industrial, Sistemas e Controles Eletrônicos
SPECIALTY: Controle de Processos Eletrônicos, Retroalimentação
SUMMARY:

In recent years, the number of distributed generation systems based on renewable energy sources, such as solar and wind, has grown significantly. In this context, it is necessary to develop and improve control techniques to increase the efficiency and reliability of these generation systems. Among the strategies proposed in the literature, synchronous generator emulation techniques stand out as an attractive solution for power flow control in interconnection systems of renewable generation units to the power grid. However, the dynamic performance of these techniques has not yet been widely discussed in situations where the equivalent line impedance parameters deviate from their nominal values. To investigate this issue, this work develops a dynamic power-flow model and analyzes its dynamic characteristics. Based on this model, the closed-loop response to the conventional virtual synchronous generator technique is analyzed, accounting for grid impedance variations.

Additionally, a robust adaptive control strategy is proposed to minimize the effects of equivalent line impedance variation on the performance of active and reactive power control. The proposed controller combines a Variable-Structure-based parametric estimation block with an Adaptive Pole-Placement Strategy to improve disturbance rejection and mitigate the impact of parameter uncertainties on the virtual synchronous generator controller dynamics. The parametric estimator is designed using Lyapunov's direct method to ensure the asymptotic stability of the control strategy in estimating power model parameters. Using the estimated model, the active and reactive power controllers are designed to be flexible, allowing their performance criteria to be adjusted in real time. Finally, simulation results for a system with a nominal power of 20 MVA, a voltage of 13.8 kV, and a frequency of 60 Hz demonstrate the effectiveness of the theoretical analysis and the proposed control strategy in reducing transient oscillations in the power controller's response across different system operating scenarios.

COMMITTEE MEMBERS:
Interno - 350693 - ANDRE LAURINDO MAITELLI
Presidente - 1149567 - ANDRES ORTIZ SALAZAR
Externo à Instituição - ELMER ROLANDO LLANOS VILLARREAL - UFERSA
Externo ao Programa - 1375337 - JOSENALDE BARBOSA DE OLIVEIRA - UFRNExterno à Instituição - LUCIANO PEREIRA DOS SANTOS JUNIOR