PMU based PSS and SVC fuzzy controller design for angular stability analysis

Master of ScienceDepartment of Electrical and Computer EngineeringShelli StarrettVariability in power systems is increasing due to pushing the system to limits for economic purposes, the inclusion of new energy sources like wind turbines and photovoltaic, and the introduction of new types of loads such as electric vehicle chargers. In this new environment, system monitoring and control must keep pace to insure system stability and reliability on a wide area scale. Phasor measurement unit technology implementation is growing and can be used to provide input signals to new types of control. Fuzzy logic based power system stabilizer (PSS) controllers have also been shown effective in various studies. This thesis considers several choices of input signals, composed assuming phasor measurement availability, for fuzzy logic-based controllers. The purpose of the controller is to damp power systems’ low frequency oscillations. Nonlinear transient simulation results for a 4-machine two-area system and 50 machine system are used to compare the effects of input choice and controller type on damping of system oscillations. Reactive power in the system affects voltage, which in turn affects system damping and dynamic stability. System stability and damping can be enhanced by deploying SVC controllers properly. Different types of power system variables play critical role to damp power swings using SVC controller. A fuzzy logic based static var compensator (SVC) was used near a generator to damp these electromechanical oscillations using different PMU-acquired inputs. The goal was again improve dynamic stability and damping performance of the system at local and global level. Nonlinear simulations were run to compare the damping performance of different inputs on the 50 machine system

Controle de amortecimento de oscilações eletromecânicas utilizando unidades eólicas do tipo DFIG

The use of renewable energy sources for the production of electric energy is gaining more and more space in the world scenario, due to the great concern with environment, for example. Due to the evolution in technologies and large investments in recent years, the Wind Energy sector is increasingly becoming a competitive and clean alternative for the energy matrices diversification. In this work will be presented aspects related to the participation of wind farms in the control of frequency electromechanical oscillations damping, through the installation of an additional control oscillation via POD (Power Oscillation Damping) in the rotor side converter (active power grid or Reactive) of the DFIG wind units. The simulations were performed through the CEPEL programs: ANAREDE (Analysis of Electrical Networks) and ANATEM (Analysis of Electromechanical Transients) in three test systems.A utilização de fontes de energias renováveis para produção de energia elétrica vem ganhando cada vez mais espaço no cenário mundial, devido à grande preocupação com relação ao meio ambiente, por exemplo. Devido à crescente evolução nas tecnologias e aos grandes investimentos nos últimos anos, o setor de Energia Eólica vem se tornando cada vez mais uma alternativa competitiva e limpa para diversificação das matrizes energéticas. Neste trabalho serão apresentados aspectos relacionados à participação de Parques Eólicos no controle de amortecimento das oscilações eletromecânicas de baixa frequência, através da instalação de uma malha de controle adicional via POD (Power Oscillation Damping) no conversor do lado do rotor (malha de potência ativa ou reativa) das unidades Eólicas do tipo DFIG. As simulações foram realizadas através dos programas do CEPEL: ANAREDE (Análise de Redes Elétricas) e ANATEM (Análise de Transitórios Eletromecânicos) em três sistemas testes

Desenvolvimento de sistemas robustos de estabilização de oscilações de potência eléctrica para utilizar em redes com grande integração de produção eólica

Tese de doutoramento. Engenharia Electrotécnica e de Computadores (Área de especialização de Energia). Faculdade de Engenharia. Universidade do Porto. 200