Small signal modeling and stability analysis of N-phase interleaved boost converter

Solar PVs are emerging as one of the better alternatives for power generation. The output from solar cells requires boost topologies for obtaining an adequate level of voltage. Interleaving techniques in boost topologies lead to a better current sharing and a reduction in current ripple. This paper presents a small signal model for n phase interleaved boost converter (IBC). The transfer functions are derived considering the parasitics of inductors, capacitor and power electronic switch. Such considerations result in accurate mathematical models closely pertaining to a practical IBC. The resulting analysis will ensure development of effective control strategies. The derived mathematical model's accuracy is investigated by carrying out open loop control studies in the frequency domain on a 3-phase IBC using MATLAB^®/SIMULINK.

I. Introduction

The global power outlook has witnessed a paradigm shift, as the focus of power generation has transitioned to renewable sources of energy. Solar PVs are gaining more attention than other renewable sources when electricity production is considered. The power output from these systems alone is not adequate to satisfy the consumers' need. Thus voltage stepping is a necessity to bring the power levels at par with the grid. Switched DC—DC converters have proven to be an efficient technology in renewable energy based power systems [1]–[4].