Quasi-Z-Source Three-Phase Voltage Source Inverter with Virtual Space Vector Modulation to Increase the Voltage Gain and for the Reduction of Common Mode Voltage
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Electrical Engineering Department, IIEST, Shibpur, Howrah, India
Power Electronics and Drives 2024;9 (44):272-291
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ABSTRACT
A quasi-Z-source network is used to boost the DC bus voltage of a voltage source two-level H-bridge inverter to increase the voltage
gain. With the increase in the DC bus voltage, the common mode voltage (CMV) also increases. The CMV is reduced using virtual
space vector pulse width modulation (SVPWM). Due to the presence of a quasi-Z-source network, the expression of the CMV changes
significantly with respect to the conventional voltage source two-level H-bridge inverter fed from a pure DC supply. In this paper, a
detailed analysis of the origin of the CMV for the quasi-Z-source two-level H-bridge inverter is presented. Additionally, it is shown how
the CMV is affected for a DC input supply taken from a three-phase diode bridge rectifier. The work also details the scheme for suitable
placement of shoot-through time intervals required for boosting within the non-active time intervals in virtual SVPWM. The simulation
and experimental results show the scheme is effective in increasing the voltage gain and reducing the CMV arising at the third harmonic
of the desired output frequency by at least 33.33%.