A New Diode-Clamped Multilevel Inverter for Capacitor Voltage Balancing

Abstract

Abstract-In this paper, a new diode-clamped multilevel inverter for capacitor voltage with inserted inductors is proposed. The key is to solve the voltage unbalance of diode-clamped multilevel inverter (DCMLI), which utilizes fewer switches and adopts a simpler control strategy. In this way, the cost and volume of the DCMLI can be effectively reduced. Firstly, the new five-level inverter topology is analyzed in detail under different operation modes. Then, the proposed topology extended to (2n+1) level inverter is introduced and discussed. Finally, both simulation and experiment results are demonstrated to verify the validity of the proposed topology.

Multilevel inverter application for railway traction motor control

“…However, it is difficult to expand the step of voltage levels because this inverter structure should increase the number of diodes switchgear, making the system unrealized. In addition, the capacitor-clamped multilevel inverter has had a structure like a diode-clamped multilevel inverter [12]- [14].…”

State feedback control of advanced static var compensator using a five-level NPC inverter topology

“…Different methods were proposed to solve this issue. Some researchers have proposed to insert two inductors in one leg to balance the capacitors voltage [14], [15]. Others have introduced a modified switching pattern and improved the optimized PWM technique [16], [17].…”