Current source inverter

Abstract

ABSTRACT

The growth of the world’s population leads to increased energy needs. The use of fossil energy leads to challenges. The main reason for this is that the use of fossil fuels has a negative impact on global climate change, and the world is heading towards running out of fossil fuels in a few years. Renewable energy sources like photovoltaic and wind power plants are good solutions for those challenges. For the generation of clean energy, batteries are not necessary. Most renewable energy sources are intermittent in nature, which is why battery energy storage systems could be useful. There are mainly two types of converters for converting direct current to alternating current. They are voltage-source inverters and current source inverters. A voltage source inverter is well-known and widely used in many industrial applications. But a little research has been done about current source inverters due to some problems such as open circuits and large inductances on the DC side. The project deals with the Current Source Inverter for Battery Energy Storage System. The main objective of this project is to model, design, control, and simulation a current source inverter and analyse the advantages and disadvantages of both converters, with focus on the current source inverter. In this thesis, a cascaded control structure is used for controlling three-phase grid-connected CSI. Current and voltage control design and simulation of CSI will be the focus. The proportional integral controller (PI-controller) is used to control the inverter. To verify the theoretical study, a simulation model in MATLAB/Simulink is built and verified. Keywords Current source inverter, voltage source inverter, battery energy storage system, pulse-width modulation, proportional integral control and grid-connected.