Hybrid Pulsewidth Modulated Single-Phase Quasi-Z-Source Grid-Tie Photovoltaic Power System

A hybrid pulsewidth modulated single-phase quasi-Z-source grid-tie photovoltaic (PV) power system is proposed. The hybrid pulse-width modulation (HPWM) combines the pulse-width modulation (PWM) and the pulse-amplitude modulation (PAM). The PWM works when the ac output voltage is lower than the dc so...

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Bibliographic Details
Published in:IEEE transactions on industrial informatics 2016-04, Vol.12 (2), p.621-632
Main Authors: Liu, Yushan, Ge, Baoming, Abu-Rub, Haitham, Sun, Hexu
Format: Article
Language:English
Subjects:
Capacitance
Capacitors
Control systems
Electric potential
Inverters
Modulation
Photovoltaic cells
photovoltaic power system
Power systems
Pulse amplitude modulation
Pulse duration modulation
Pulse width modulation
quasi-Z-source inverter
single-phase grid-tie control
Solar cells
Switches
Voltage
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Summary:A hybrid pulsewidth modulated single-phase quasi-Z-source grid-tie photovoltaic (PV) power system is proposed. The hybrid pulse-width modulation (HPWM) combines the pulse-width modulation (PWM) and the pulse-amplitude modulation (PAM). The PWM works when the ac output voltage is lower than the dc source voltage; otherwise, the PAM operates the single-phase quasi-Z-source inverter (qZSI). The HPWM leads to the reduction of power loss, and the quasi-Z-source capacitance and inductance. An effective control strategy is proposed for the new PV power system to manage the maximum power point tracking (MPPT) of PV panel, grid-tie power injection, and dc-link voltage. A grid-tie current controller, combining a repetitive controller and a proportional-resonant regulator, achieves strong harmonic suppression, fast dynamic, and zero tracking error. A 500-W prototype is built to verify the new system. Power loss estimation and impedance design are detailed. Experimental tests validate the HPWM, new PV power system with higher efficiency, and the related control method.
ISSN:1551-3203
1941-0050
DOI:10.1109/TII.2016.2524561