چكيده به لاتين
In this thesis, the structure and control of an electronic transformer in a rectifier application are discussed. The transformers currently used in the industry have some disadvantages such as the lack of controllability of voltages and currents, high harmonic sensitivity, low quality of voltage waveform during saturation, and so on. The transformer studied in this project consists of several power electronic converters, which are referred to as Electronic Transformers. In this project, this transformer is studied in rectifier mode; therefore, it functions as a step-down transformer and its output voltages are in DC. This transformer consists of two stages, the rectifier stage and the step-down voltage stage, which are responsible for rectifying the AC input voltage and reducing the generated DC voltage, respectively. In this project, first, available structures for each stage of electronic transformer are investigated, Then the most suitable structure for the desired application is selected. Next, the predictive control method is used as a hybrid control on the rectifier stage of the transformer. This control method is a combination of predictive control method and voltage balancing algorithm. In addition to simplicity compared to other available methods, the proposed method includes achievements such as input flow control, input power control, output voltage control, and output voltage equilibrium.
