Control of Bubbling Phenomenon in Bipolar SPWM Inverters

Significant growth in the adoption of electric cars and non–conventional energy sources has led to an increase in the use of power electronic converters, in particular, the power inverter system. However, in some cases its performance has been affected by a phenomenon known as bubbling, which consists on a significant distortion of the output waveforms by phase restricted high frequency oscillations. As a consequence, in this paper we propose to vary the frequency of the SPWM to control the bubbling phenomenon reported in the inverter systems. Our proposed strategy was successfully applied to these inverters with a very relevant advantage, it does not require any physical or structural change to the system configuration, only an appropriate tuning of the ramp frequency signal. This process was performed by using a bifurcation perspective and detecting the frequency values for which the bubbling phenomenon and other nonlinear dynamics of the systems are suppressed.