Control and Implementation of Three Level Boost Converter for Load Voltage Regulation

The multilevel converters offer significant advantages for high power applications. The use of multilevel DC/DC converters provides improved efficiency for power conversion and transmission at high voltage. This paper investigates the control and implementation of a three level boost converter for regulating the load voltages. A PI controller based switch signal phase delay control (SSPDC) method is used for adjusting the load voltages at equal turn on and turn off time of the converter switches. The circuit simulation is done in Matlab/Simulink. The controller is realized by using the FPGA in Labview/Compact-Rio module. Software waiting loop length control technique is used for implementing the switch signal delay control. The hardware circuit is implemented and tested. The results show a validation of the controller for regulating the voltages. This method can easily be applied for voltage balancing in a three level neutral point clamped inverter where neutral voltage imbalance is always an issue.