Switching Techniques for Reduce Current Measurement Noise by Switching between Parallel Single Shunt Inverters with Common DC Link

This study proposes a switching technique to reduce current measurement noise in parallel single-shunt inverters with a common DC link. In typical single-shunt inverters, the current is measured once current ringing is stabilized to minimize the impact of switching noise. However, switching ripples may result in current measurement error of other inverters in parallel inverter systems that share a common DC link. Therefore, inverter switching transition should not be conducted on the sensing duration of both inverters. For this reason, this paper proposes the modification of the switching timing of three-phase inverters by adding offset voltage. The main contribution of this paper is that it eliminates the current measurement noises coming from the switching transition. The performance of the proposed method is validated by the simulation and experimental results.