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The common-mode leakage current should be carefully considered when designing a transformer-less photovoltaic (PV) inverter since the leakage current can cause the output current distortion and increase the operational risk. The unipolar SPWM of traditional H-bridge inverter can produce the superior output performance but will cause a high-frequency fluctuated common-mode voltage and consequently the non-negligible leakage current. To attenuate the fluctuation phenomena of common-mode voltage,doi:10.1109/tpel.2016.2587660 fatcat:bbzzuhqgprdnzeyjxuphwtvptu