Banca de DEFESA: SÂMARA DE CAVALCANTE PAIVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : SÂMARA DE CAVALCANTE PAIVA
DATE: 13/10/2020
TIME: 08:00
LOCAL: Remoto
TITLE:

Wavelet-Based Systems for Frequency Monitoring and Islanding Detection of AC Microgrids.

KEY WORDS:

Islanding detection, frequency estimation, microgrids, power systems, continuous wavelet transform.

PAGES: 150
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUBÁREA: Sistemas Elétricos de Potência
SPECIALTY: Geração da Energia Elétrica
SUMMARY:

The modern distribution system widely uses renewable energy sources (RESs) as a distributed generation that introduces problems like unintentional islanding, protection concerns, and reverse power flow. The RES intermittent characteristics can cause frequency deviations that could result in systems instabilities. In general, hierarchical structures implement these microgrids' power flow control management, composed of primary, secondary, and tertiary control layers. The primary control layer consists of inner current and voltage control loops, typically implemented via droop control loops, for the purpose of maintaining a stabilization of frequency and voltage amplitudes, as well as power-sharing. The principal drawbacks of droop control approaches are steady-state frequency and voltage deviations. For that reason, the secondary control layer is introduced to mitigate these deviations. The accurate knowledge of microgrid frequency deviations permits the implementation of proper frequency restoration. Besides, those microgrids could operate in the connected or islanding modes. Islanding or fault occurrences must be detected and treated to ensure system stability. This way, the continuous wavelet transform is employed for developing a hybrid islanding detection and a frequency monitor to fulfill the microgrid's requirements related to a secure islanding detection and a frequency restoration. In this Thesis, both systems' development is carried out, with the effectiveness of proposed methods evaluated and validated through experimental results.

BANKING MEMBERS:
Presidente - 1196444 - RICARDO LUCIO DE ARAUJO RIBEIRO
Interno - 1807863 - FLAVIO BEZERRA COSTA
Interno - 1543191 - LUIZ FELIPE DE QUEIROZ SILVEIRA
Externo à Instituição - JOSEP MARIA GUERRERO ZAPATA
Externo à Instituição - KLEBER MELO E SILVA - UnB
Externo à Instituição - LEANDRO MICHELS - UFSM