Controle de corrente aplicado a conversores PWM conectados à rede elétrica sem sensor de tensão CA utilizando observadores de corrente por modos deslizantes

• Ano de defesa: 2014
• Autor(a) principal: Tonin, Rodrigo Gehrke
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Santa Maria; BR; Engenharia Elétrica; UFSM; Programa de Pós-Graduação em Engenharia Elétrica
• Palavras-chave em Português: Observador de corrente por modos deslizantes; Controle de corrente sensorless; Sincronismo com a rede sem sensor de tensão; Separação de sequência de fase positiva; Sliding mode current observer; Sensorless current control; Grid voltage sensorless synchornism; Positive sequence separator; CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA
• Link de acesso: http://repositorio.ufsm.br/handle/1/8554

This master thesis presents a current sliding mode observer for voltage sensorless grid connected converters. To perform the grid synchronization a sliding mode current observer in stationary axes αβ is proposed. Aiming its implementation in digital signal processors or microcontroller both the synchronism and control are developed in discrete time domain. Firstly the line currents are measured, then the transformation to stationary axes is carried out and the sliding mode current observer is proposed. Based on a Fortescue discrete component theory an algorithm to separation of sequence positive phase is proposed aiming to obtained the positive grid angular position to realized the synchronous coordinates axes transformation. The current control is carried out by two PI controllers designed in a discrete time domain. The good performance of the proposed method is proven through the simulation and experimental results.