Abstract
In this paper, a modified three-phase two-level voltage source inverter is proposed. By combining the conventional three-phase H-bridge inverter with a switched-capacitor-voltage-doubler network, the DC-link voltage of the proposed inverter is double with respect to the input DC voltage. As a result, the output voltage of the proposed inverter can be higher than the input DC voltage. Furthermore, a common-mode voltage (CMV) of the proposed inverter can be reduced through controlling the two additional switches based on the space vector pulse-width modulation. Compared to the existing modulations and topologies, the variation in CMV can only be up to 16.6% of DC-link voltage. Furthermore, the voltage stress across additional switches and diodes is equal to half of DC-link voltage. Mathematical analysis, operating principles, and comparison of the proposed three-phase two-level voltage source inverter with the conventional three-phase voltage source inverters are presented. The simulation results based on PLECS software verify a good performance of the proposed inverter. Finally, a laboratory prototype based on a TMS320F280049 DSP is developed and experimental tests are carried out to validate the effectiveness of the proposed three-phase inverter topology.
Highlights
The conventional three-phase two-level voltage source inverters (VSIs) have been typically used in various industrial applications such as distributed power systems and ac motor drive systems [1]–[5]
This paper has presented a modified three-phase two-level voltage source inverter topology for common-mode voltage reduction
The magnitude of common-mode voltage of the proposed SCVD-B2I under discontinuous PWM (DPWM) strategy is equal to 33.3% VPN
Summary
The conventional three-phase two-level voltage source inverters (VSIs) have been typically used in various industrial applications such as distributed power systems and ac motor drive systems [1]–[5]. By controlling two additional active switches to float the inverter from the DC voltage source in zero states, the variation in CMV is 33.3% of DC-link voltage. The CMV in the proposed inverter only varies from VPN /6 to VPN /3 during active-vector states. The DC-link voltage of SCVD-B2I is VPN = VCa + VCb = 2Vg. From operating principles of the proposed SCVD-B2I, it can be noted that the CMV varies from VPN /6 to VPN /3 (16.6% of VPN ) during powering mode CONTROL STRATEGIES FOR SCVD-B2I TOPOLOGY Based on characteristics CMV of the proposed SCVD-B2I, we can see that the CMV varies from VPN /6 to VPN /3 (16.6% of VPN ) during powering mode. Some PWM Strategies for SCVD-B2I are discussed
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