A Control Structure for a Bidirectional DC-AC Converter with Power Quality Support Functions
Name: LAILA SINDRA RIBEIRO
Publication date: 02/12/2022
Advisor:
Name |
Role |
|---|---|
| DOMINGOS SÁVIO LYRIO SIMONETTI | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| DOMINGOS SÁVIO LYRIO SIMONETTI | Advisor * |
| LUCAS FRIZERA ENCARNAÇÃO | Internal Examiner * |
Summary: The expansion of distributed generation, especially photovoltaic, provokes an increase in the number of DC-AC converters connected to the grid. These converters may offer power grid support functions such as power factor correction and harmonic compensation. Those functions raise the equipment value to the grid and contribute to the power systems confiability and power quality. In this context, the objective of this work is to design a DC-AC converter with the grid support functions as power factor correction and harmonic compensation, besides electrical power interchange. The work focuses on the controller of the converter, with the algorithms embedded in a DSP and power converter in a Hardware In the Loop (HIL). A Typhoon HIL 402 is used to simulate batteries, the converter, the filter, the power grid, and loads. Voltage and current signals are sent by Typhoon HIL to an eZdsp F28335 controller. Then, the controller processes the measurements and sends to the Typhoon HIL the pulses to drive the switches. This dissertation includes a
theoretical background of the converter topology operation, filter design, and control loops used in the project. Chapter 3 details the project, presenting the power grid simulated, the microcontrollers resources used and its configuration, parameters adopted in controllers and block diagrams, and the logic of the converter operation modes. Experimental results demonstrate that the converter is capable of operating with grid support functions with a good performance, correcting power factor and compensating 3rd, 5th, and 7th harmonics. Furthermore, the converter can have multiple functions activated, distributing its power capacity to prioritize the chosen operation mode.
