Continuous Current Featured Quadratic Boost Converter with Xilinx System Generator-Based PI Controller for Renewable Energy Integration

Continuous Current Featured - Quadratic boost converter (CCF - QBC) is attracted over other high gain dc-dc converter because of its improved voltage gain, reduced component stress, continuous input current and lower components. Hence, it is used as an integrating device in renewable energy sources (RESs). The steady state analysis of the QBC is carried out with help of equivalent circuit and analytical waveforms during continuous conduction mode. The effect of parasitic resistance of various components on the output voltage of the CCF - QBC is investigated. The CCF-QBC state-space model is developed, and a small-signal model is obtained. Using the small-signal model, the transfer function(TF) is derived and stability of the converter is analyzed. A PI controller is designed for the CCF - QBC to regulate the output voltage when there are uncertainties from the source and the load side. The designed controller is implemented in the Xilinx System Generator (XSG) platform. A 200 W, 350 V, 100 kHz laboratory prototype of the CCF - QBC is fabricated, and the developed prototype is tested in the closed loop using the implemented XSG controller successfully. The test results are presented in this paper for step change in load and source side voltages. The features of the CCF - QBC attract its applications in renewable energy source integration.