An Improved Overmodulation Strategy for a Three-Level NPC Inverter Considering Neutral-Point Voltage Balance and Common-Mode Voltage Suppression

Zero-voltage switching for the neutral-point-clamped (NPC) inverter

This paper proposes a transformer-assisted pulsewidth-modulation zero-voltage-switching neutral-pointclamped (NPC) inverter. With the assistance of a transformer-assisted small-rating lossless auxiliary circuit, the main switches work with zero-voltage switching without suffering from any voltage/current spikes, under simple explicit control. The technique allows for higher operating frequency ...

A Three Level NPC LC-Switched Voltage Source Inverter

This paper presents a three level NPC LCswitched voltage source inverter. Conventional multilevel voltage source inverter behaves like voltage step down converter. Recently multilevel buck-boost Z-source inverter (ZSI) has been developed for better efficiency and power quality in renewable energy system. The impedance network of the Z-source inverter requires equal inductors and equal capacitor...

Space Vector Modulation Techniques for Common mode Voltage Elimination in the Three- level Voltage Source Inverter

AbstractThe low common mode voltage vector modulation technique for the three-level cascaded voltage source inverter is presented in the paper. The large number of available states for multilevel inverters can make implementation vector control strategies complicated. The main characteristic of the proposed modulation technique is its simplicity of implementation due to the fact that any availa...

A Varied VSVM Strategy for Balancing the Neutral-Point Voltage of DC-Link Capacitors in Three-Level NPC Converters

In the research field of multilevel converters, three-level NPC (neutral-point-clamped) converters, which unfortunately may cause the deviation of the neutral-point voltage of DC-link capacitors, are widely discussed. Theoretically, virtual space vector modulation (VSVM) could guarantee the balance control of the neutral-point voltage. However, there still exist some uncontrollable space vector...

Diode Free T-type Three-level Neutral Point Clamped Inverter for Low Voltage Systems