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Multilevel Inverters

T05.1 - A Variable Switching Frequency DPWM with Leakage Current Suppression for ZVS Three-Phase Three-Level Inverter

Tuesday, March 24, 2026
8:30 AM - 8:50 AM CT
Location: 217A
The variable switching frequency discontinuous pulse width modulation (VFDPWM) technique can achieve zero voltage switching (ZVS) in three-phase inverter without requiring any auxiliary circuits. However, when applied to transformerless photovoltaic systems, the rapid variations in common-mode voltage (CMV) introduce excessive leakage current that may violate safety standards. Existing solutions fail to simultaneously achieve ZVS and effective leakage current suppression. This paper proposes a novel variable switching frequency DPWM with leakage current suppression (LCS-VFDPWM) for three-phase three-level T-type inverter that addresses both challenges without additional auxiliary circuits. Experimental results demonstrate that full-range ZVS can be achieved and leakage current can be significantly reduced about 64.7% compared to the traditional method.