Modeling and control of a boost converter for pseudo-resistive input behavior

In this paper we present the analysis and development of a boost-type switching converter for efficient power conversion from a source with an arbitrary voltage waveform containing multiple frequencies to a DC storage medium such as a battery. This type of energy transfer is of great interest in various green energy conversion technologies involving irregular sources of power such as wave and wind with time-varying amplitudes and frequencies. Motivated by these applications, a novel modeling and control scheme is developed for a pulse-width-modulated (PWM) boost converter. In particular, conditions under which the converter would act as a pseudo-resistor as seen by an arbitrary input voltage source are derived. Based on the pseudo-resistive relationship obtained between the input voltage and current a feedback controller is developed that regulates the converter input resistance to a desired value. The importance of this result is that power absorption can be controlled with unity power factor by controlling the input resistance of the converter for an arbitrary band-limited input voltage. Numerical simulations are presented that evaluate performance of the proposed modeling scheme and control system.