A new grid-connected PV system based on cascaded H-bridge quasi-Z source inverter

A new grid-connected PV system based on cascaded H-bridge quasi-Z source inverter

A new scheme for grid-connected photovoltaic (PV) interface by combination of a quasi-Z source inverter (qZSI) into cascaded H-bridge (CHB) is proposed in this paper. The proposed scheme enables PV string voltage boost to a higher level, and solves the imbalance problem of DC-link voltage in traditi...

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Hauptverfasser: Dongsen Sun, Baoming Ge, Fang Zheng Peng, Haitham, A. R., Daqiang Bi, Yushan Liu
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Sprache:eng
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Educational institutions
Inverters
Manganese
Power generation
Pulse width modulation
Voltage control
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creator Dongsen Sun
Baoming Ge
Fang Zheng Peng
Haitham, A. R.
Daqiang Bi
Yushan Liu
description A new scheme for grid-connected photovoltaic (PV) interface by combination of a quasi-Z source inverter (qZSI) into cascaded H-bridge (CHB) is proposed in this paper. The proposed scheme enables PV string voltage boost to a higher level, and solves the imbalance problem of DC-link voltage in traditional CHB inverters. A multilevel voltage waveform of inverter output is generated by an improved phase shifted sinusoidal pulse width modulation (PS-SPWM) algorithm, which introduces shoot-through states into the conventional zero states to control qZS-CHB module. The effective control schemes are proposed to regulate the maximum power point tracking (MPPT) of each string, and control the DC-link voltage of each H-bridge, respectively. Grid injected power is controlled corresponding to the proportionality factors of each PV string output power. A 1.5 kW system is built in MATLAB/SIMULINK, and the simulation results verify the proposed novel multilevel PV interface inverter and its control principles.
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subjects Educational institutions
Inverters
Manganese
Power generation
Pulse width modulation
Voltage control
title A new grid-connected PV system based on cascaded H-bridge quasi-Z source inverter
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