Cascade Control Loop of DC-DC Boost Converter Using PI Controller

DC-DC boost converters which provide dc output voltage are widely used in several applications such as photovoltaic power systems, hybrid vehicle, cellphones... Maintaining a constant output voltage of the DC-DC boost converter under variable input voltage and load changes have always attracted the attention of many researchers and many studies have been published on this issue. This paper, present an averaged model of DC-DC boost converter in continuous conduction mode (CCM). A single loop control is generally used to regulate the output voltage of the boost converter. In this paper, a cascade loop control includes two cascaded control loops; internal current control, and external voltage control is used to improve control performance. Subsequently, Proportional-Integral (PI) controller is used to tracks the input desired reference signal and eliminates the load disturbances. The mathematical model and the controller are implemented in the MATLAB/SIMULINK environment. Simulations results are presented and discussed to evaluate the performance of the controller.