A Novel Cost-Effective Two-Level Inverter with Combined Use of Thyristors and IGBTs

Abstract

In this paper, a novel topology of two-level voltage-type inverter is proposed. The proposed inverter has three bridge arms while each bridge is made up of two thyristors, one IGBT and four diodes. Thyristors complete the phase positioning of the inverter, IGBT completes the modulation of different modulation modes such as SPWM, SVPWM, and SHPWM, and the diodes complete the commutation of the bridge arms. Compared to the traditional voltage-type inverter with six IGBTs, the proposed voltage-type inverter using three IGBTs can achieve the same function with highly reduced cost. The principle of the proposed two-level inverter is explained in detail. The simulation and experiment results demonstrate the performance and effectiveness of the proposed inverter-type inverter.

Fig. 1. Topology of the traditional two-level inverter

Fig. 2. Topology of the proposed two-level inverter

Fig. 3. Energy transfer model of new-type two levelinverter

Fig. 4. Switch time series of novel two-level inverter

Fig. 5. The principle diagram of the asymmetry rulesampling method

Fig. 6. Signal of SPWM

Fig. 7. Waveform of drive for thyristor and IGBT

Fig. 8. Voltage of thyristor and IGBT

Fig. 9. Output voltage of inverter

Fig. 10. Output current of inverter

Fig. 11. Experiment system

Fig. 12. DSP output waveform of phase A

Fig. 13. DSP output waveform of phase B

Fig. 14. DSP output waveform of phase C

Fig. 15. DSP output waveform of three phase IGBT

Fig. 16. DSP output waveform of three phase up bridgearm thyristor

Fig. 17. Thyristor drive output waveform of three phasebridge arm

Fig. 18. Output voltage of three phase

Fig. 19. Output line voltage of three phase

Fig. 20. Output current of inverter

Table 1. Electric devices and cost estimation

Table 2. Switch state of novel two-level inverter

Table 3. Basic parameter of new-type two level inverter