Journal of Electrical Engineering : Volume 17 / 2017 - Edition : 4

A PULSE WIDTH MODULATION FOR PV CONNECTED DIODE ASSISTED Z SOURCE NPC-MLI TO OBTAIN HIGH VOLTAGE GAIN

Authors:
C. SANTHAKUMAR
R. SHIVA KUMAR
C. Bharatiraja
Domain:
power electronics
Abstract:
The Z source inverter/ multilevel inverter (MLI) is an unavoidable converter technology in the power electronics family for renewable energy application since it having a nature of single stage operation. Particularly, in PV application these inverters are boosting the voltage in the single stage while converting DC to AC. Normally, the diode assisted Z Source Neutral Point Diode Clamed (NPC-MLI) with the photovoltaic system produces a supreme voltage gain that is relatively better than other double stage boost conversion practices. This paper mainly explores vector selection approach based pulse width modulation (PWM) for diode-assisted NPC-MLI to obtain a high voltage gain without compromising in waveform quality. To attain a higher voltage, gain maximum dc-link voltage utilization and power switches stress must be reduced. From the above issues in the diode assisted NPC-MLI leads to vector selection approach PWM technique to perform uniform charging and discharging capacitor to obtain maximum voltage gain. The operation of proposed inverter and its relation between the voltage gain and boost duty ratio then voltage stress on the switching device and gain are theoretically investigated. Due to energetic performance, Z source diode assisted NPC-MLI is more capable for wide range dc/ac power conversion in single stage, which is more suitable for PV applications. Besides, theoretically investigated are validated via simulation and experimental results
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