SEPIC-CUK Converter For PV Application Using Maximum Power Point Tracking Method

Solar energy is the most important and freely available energy source which generates in DC form, which requires power electronic devices to adapt its output to requirements. The conventional SEPIC and CUK converters are formed by two inductors, link capacitors, switch and diode. The CUK is a negative output converter, while the SEPIC is a positive output converter. While comparing the SEPIC-CUK configuration it is observed that both converters have the same voltage conversion ratio with opposite polarity. Bipolar DC link has two wires one with positive polarity and one with negative polarity. In normal operation, the current through ground is zero. It has two voltage levels, allowing fault conditions a monopolar operation. The main advantage of the proposed configuration is that it allows implementation of bipolar DC link with only one controllable switch. The system can be connected to the AC or DC micro grids. Linear Variable structure control MPPT algorithm is use to extract maximum power from the PV module and also to control the switch.