Banca de DEFESA: MAXWEL DA SILVA SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MAXWEL DA SILVA SANTOS
DATE: 02/07/2021
TIME: 09:00
LOCAL: Remota
TITLE:

Improved Margin Voltage Control Strategy for Multi-terminal High Voltage Direct Current Systems based on the Modular Multilevel Converter for Robustness Towards Disturbances

KEY WORDS:

Margin Voltage Control, Master-Slave Control, Modular Multilevel Converter, Multi-Terminal High Voltage Direct Current, Voltage Droop Control.

PAGES: 67
BIG AREA: Engenharias
AREA: Engenharia Elétrica
SUBÁREA: Sistemas Elétricos de Potência
SPECIALTY: Transmissão da Energia Elétrica, Distribuição da Energia Elétrica
SUMMARY:

In modern systems, multi-terminal high-voltage Direct Current (MTDC) transmission technology has been considered the key technology for long-distant bulk electric power transmission, asynchronous grid interconnections, and offshore wind energy converter systems (WECS). The main purpose of an MTDC grid is to share power among the AC grids. However, this technology presents challenges in its operation and control. Therefore, for its control is necessary the use of appropriate control system strategies, such as master-slave, margin voltage, voltage droop, and their combinations. In this work, it is proposed a modification in the DC voltage control loop of the margin voltage control strategy aiming to avoid degradation of current control and to increase the supportability to disturbances in the power grid. This modification is based on closed-loop control of the power and feed-forward compensation of the DC grid power. The performance of the proposed method was assessed in a four-terminal meshed MTDC system topology based on the multilevel modular converter (MMC) under abnormal operating conditions and a comparison with the margin voltage and voltage droop control strategies was accomplished. The operation scenarios consider challenging and common failures for MTDC network control systems such as power flow variation in a converter station, open-circuit of a DC transmission line, and failure of a converter station. The proposed control presented the best performance, obtaining a new balance of power flow with less power and voltage oscillations.

BANKING MEMBERS:
Presidente - 1597497 - LUCIANO SALES BARROS
Interno - 1328152 - CARLOS EDUARDO TRABUCO DOREA
Interno - 1807863 - FLAVIO BEZERRA COSTA
Externo à Instituição - RODRIGO ANDRADE RAMOS - USP