This article proposes a dual space vector PWM control technique for a three-phase to five-phase quasi Z-source direct matrix converter (QZSDMC). The proposed circuit consists of a quasi-impedance source network along with a five-phase traditional matrix converter. With the observation of bidirectional operating capability and the utilization of shoot-through duty ratio, the proposed converter can ensure both buck and boost operations. This converter overcomes the voltage transfer ratio restriction and poor voltage regulation of the traditional matrix converter. Also, this converter ensures continuous input current with an absence of input LC filter components. The proposed direct AC to AC power converter gives an alternate solution to the multiphase drive system instead of the traditional voltage source inverter. The developed dual space vector PWM control technique for three-phase to five-phase voltage conversion is derived from the basic space vector PWM approach. The proposed dual space vector PWM technique utilizes 90 active states and 3 zero vector states among 243 switching states. The QZSDMC has been analysed with a dual space vector PWM approach along with the distribution of shoot-through state in the zero vector. The proposed topology along with the control strategy has been simulated using MATLAB/Simulink environment.

This research article implemented a new technique for a direct ac to ac power conversion in a three-phase quasi Z-source direct matrix converter (QZSDMC). The QZSDMC is designed by connecting a quasi Z-source impedance network in series with a normal direct matrix converter. In this system, three-phase fixed voltage and supply frequency has been received from the source, whereas the variable ac voltage and frequency are fed to the stand-alone system. The bidirectional operation capability of QZSDMC provides buck-boost action with a minimum number of control switches. Here, the voltage transferring capability is controlled by its shoot-through duty ratio value. Due to the direct duty ratio pulse width modulation technique (without harmonics injection) in QZSDMC, the output voltage is doubled along with variable frequency. However, the discussion is limited here because this technique is used for an odd number of output phases. The increased output voltage from 100 V to 245 V with a minimum amount of harmonics distortions has been observed using MATLAB simulation and the same is experimentally validated. In addition to this, the converter having the capabilities of converting a fixed frequency of 50 Hz into variable frequencies like 25 Hz, 75 Hz and 100 Hz.