A Novel Three-Phase Dual-Output Neutral-Point-Clamped Three-Level Inverter

Authors:
Publisher website
Google Scholar
Abstract
A novel topology of three-phase dual-output neutral-point-clamped three-level inverter (DO-NPC-TLI) is proposed. DO-NPC-TLI can achieve two groups of AC voltage outputs with adjustable frequency and amplitude . Describe the topology in detail. The proposed topology is on the basis of neutral-point-clamped three-level inverter (NPC-TLI). 8 switches and 6 clamping diodes are added to the NPC-TLI to form the new topology. And then analyze the working principle of the circuit. With the consideration of the neutral point voltage balance, a modulation strategy combining a kind of time-sharing modulation idea and virtual space vector pulse width modulation(VSVPWM) is proposed. In order to simplify the complicated calculation process of VSVPWM, a carrier-based pulse width modulation (CBPWM) based on VSVPWM is proposed. All of the duty ratios are used to calculate modulation waves of DO-NPC-TLI. Driving signals of switches are generated by comparing the modulation waves with a carrier. Modulation strategy mentioned above is verified by the experiment. The correctness of experiment results illustrates the effectiveness of modulation strategy and the feasibility of the proposed circuit.
Funding Information
  • National Natural Science Foundation of China (51877035)

This publication has 20 references indexed in Scilit: