Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 69, Issue 3, Pages 2191-2201Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2021.3065596
Keywords
Inverters; Leakage currents; Modulation; Capacitors; Pulse width modulation; Fluctuations; Voltage control; Flying capacitor (FC) inverter; photovoltaic (PV) grid-connected systems; pulsewidth modulation (PWM)
Categories
Funding
- National Natural Science Foundation of China (NSFC) [U1866211]
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This article introduces a method to eliminate common-mode voltage and reduce leakage current, and analyzes its correlation with FC voltage balance. By changing the transmission sequences of pulses and the action times' distribution of switches, FC voltage can be controlled and common-mode voltage can be reduced.
Leakage current issues are worthy of attention for nonisolated grid-connected systems. This article introduces the method of eliminating common-mode (CM) voltage and reducing the leakage current based on modulation, and analyzes the correlation between actual effects of the method and the flying capacitor (FC) voltage balance in three-phase three-level FC grid-connected inverter. The proposed carrier-based modulation can balance the FC voltage by changing the transmission sequences of pulses and theoretically achieve zero CM voltage. In order to deal with the low frequency fluctuation and bias voltage of FC caused by asymmetry of actual hardware, the control method is introduced, which controls FC voltage by changing the action times' distribution of switches, while still eliminating the CM voltage. Simulation and experimental results are provided to validate that the proposed method can control FC voltage and achieve good performance in suppressions of CM voltage, leakage, current and CM electromagnetic interference noise.
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