This research paper presents a model of predictive control with a modulator for the inverter linked to the electrical grid, using the stationary reference frame and operating under grid distorted voltage. The stationary reference frame model for the system is obtained in its fundamental frequency and then the model predictive technique is implemented, which predicts the system actions using the obtained system model without the need of any other harmonic consideration. The controller calculates the voltage vector of the inverter through the minimization of the cost function. Thus, the proposal demonstrates, through experiments, its positive results regarding the low impact of the distorted voltage in the grid current without using any harmonic consideration on the model. Experimental results and comparisons carried out endorse the proposal of this work.
Resumo -Este trabalho propõe um Controle Preditivo Robusto do tipo Finite Control Set para acionamento de máquinas de indução, com controle de corrente no referencial dq alinhado ao fluxo do rotor da máquina. A robustez do controle é levada em consideração na modelagem do controlador e na escolha da orientação, que é feita de forma direta -estimador Gopinath -e indireta, para verificar a compatibilidade dos métodos de orientação com o controlador preditivo robusto por estados finitos proposto. Resultados experimentais do controle de corrente mostram robustez para variações nas resistências muito acima do esperado em uma aplicação prática, sem perder desempenho para até a 300% de erro de resistência, mantendo erros de regime abaixo de 5% e o tempo de acomodação na casa de milissegundo. Resultados do controle do velocidade (utilizando uma malha externa com PI) mostram baixo erro de regime e robustez para até 100% de variação de resistência para ambas estratégias de orientação, com destaque para o desempenho da orientação indireta na resposta dinâmica.
A repetitive predictive control for grid-connected inverter current control scheme is presented in this paper under voltage harmonic distortion in the stationary reference frame. Predictive control is an approach that uses a receding horizon to achieve the optimal track for the reference. In this approach, the repetitive controller behavior is added to the predictive control to increase its performance under distorted voltage conditions. In addition, to apply the controller in the generation system, controller is designed from the perspectives of the power system. The controller is designed considering the state-space model in the stationary reference frame. The controller performance was verified using a laboratory experimental setup under distorted grid voltage condition. Experimental results confirm that the proposed controller can effectively suppress harmonics under both normal operation and distorted grid voltage conditions, and also satisfy the requirements stipulated in IEEE Std.
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