Abstract
The dead-time is introduced to prevent the upper and lower power devices of the same leg from conducting simultaneously. However, it will cause the actual output voltage deviate from the desired voltage and the load current distortion will occur, which is especially unexpected when the inverter operates at a low frequency. In addition, a voltage drop is produced when the current flows through the power device, which further aggravates the current distortion. This paper presents a simple compensation strategy for the dead-time and the forward voltage drop. The current polarity is obtained accurately by filtering the three-phase currents in the synchronous rotating coordinate. The driving signals in the SVPWM is adjusted according to the current polarity to compensate the dead-time. The forward voltage drops are equivalent to an error voltage vector by using the approximate average threshold voltage and average differential resistance model, which is added to the given voltage to suppress the effects of the forward voltage drops. The compensation quantities are set to change based on a piece wise linear function to eliminate the occurrence of the current clamp and the instantaneous zero-crossing switch. Finally, the proposed compensation strategy is verified by the simulation and experiment.
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