Voltage regulation of DC-DC boost converter with input filter: hybrid and embedded PWM control approaches

In this paper, two different active control approaches are proposed for a cascaded interconnection of a boost converter and an input filter. The presence of an Input filter is necessary to connect the DC-DC converter to a DC microgrid through a DC link. This modification results in a challenging design of stabilizing controller in the presence of the input filter. For this reason, a continuous embedded Pulse Width Modulation (PWM) control approach based on the averaged dynamics of the system and duty-cycle manipulation of fixed-frequency PWM control block is proposed, and a nonlinear controller with a simple structure capable of transient response modification is developed. Then, as a secondary approach, the system is presented in the hybrid dynamical system framework, and hybrid control is designed in a time-triggered scheme. The hybrid dynamical model avoids any approximation or use of PWM block, hence control policy is applied via direct switching control resulting in a variable-frequency switching signal capable of controlling chattering frequency at steady-state. Stability analysis and performance investigation are studied for both proposed controllers regarding the required conditions, and control design procedures are extracted. Finally, a comprehensive numerical simulation is evaluated and results are discussed in full detail.