Reduced Switching-Count SVM for Power Flow Control of Single-Stage Multiport Inverter-Fed Hybrid Electric Vehicles

The single-stage multiport inverter (SSMI) is becoming more and more popular as an attractive solution for hybrid electric vehicles (HEVs). By removing the dc-dc converter, there is an energy flow path between the multiple sources and the motor, which can reduce the power conversion stage and improve the integration of the inverter. However, there are some difficulties with the design of modulation strategies for SSMI, due to the highly coupled characteristics of multiple energy sources on the dc side and the heavy computational burden of the unevenly distributed space vector diagram. In addition, reducing switching losses and improving energy conversion efficiency is always the focus of SSMI. Given this, this paper proposed a reduced switching-count space vector modulation (SVM) scheme for the power flow control of SSMI. In the proposed SVM scheme, the SSMI is decoupled into two independent inverters to avoid burden computation under the unsymmetrical space vector diagram, and the total switching count is restricted to 3, which reduces the switching losses and improves the power conversion efficiency of the SSMI. Experimental results validate the effectiveness of our proposed scheme.