Islanding mode solar inverter development

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Dr. Balogh Attila
Department of Automation and Applied Informatics

This thesis will demonstrate the development and realization of a 520 W nominal power solar inverter. The converter input is connected to two solar modules with a power of 260 W each, from which the device generates an alternating voltage of a frequency of 50 Hz at 230 V. The device consists of several main parts. The boost converter - which is a switched-mode DC/DC converter - increases the non-stable voltage of the solar modules to 48 V. To ensure islanding operation, 4 batteries are the main part of the system. The full bridge inverter is responsible for generating the alternating voltage with the specified frequency and effective value (50 Hz,24 V) from the stable voltage (48 V) provided by the batteries. An LC filter is connected to the output of the device, which is used to eliminate the switching frequency components.

In the first chapter, I describe the motivation of the thesis, the structure of solar systems used today and their application possibilities. I mention the power optimization, benefits and disadvantages of solar powered systems.

In the next section, I briefly explain the steps of designing the inverter from designing the circuit to the design of the PCB . I mention the difficulties and problems I had to face during putting the device into operation for the first time.

In the third chapter, I describe the embedded software that allows islanding operation and the DSP that runs the software. The structure, operation and configuration of the peripherals required for the task are presented in more detail. Also, I'm going to look at the control loop of the boost converter and inverter.

In the last chapter of my thesis I expound the results and give further development opportunities.


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