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14PE6 An Effective Control Method for Quasi-Z-Source Cascade Multilevel Inverter-Based Grid-Tie Single-Phase Photovoltaic Power System Yushan Liu ; Beijing, China ; Baoming Ge ; Abu-Rub, H. ; Peng, F.Z. Industrial Informatics, IEEE Transactions on (Volume:10 , Issue: 1 ) DOI: 10.1109/TII.2013.2280083 Publication Year: 2014, Page(s): 1551-3203 Project Title : An Effective Control Method for Quasi-Z-Source Cascade Multilevel Inverter-Based Grid-Tie Single-Phase Photovoltaic Power System Domain : Power Electronics Reference : IEEE Publish Year : 2014 Page(s): 1551-3203 D.O.I : 10.1109/TII.2013.2280083 Software Used : MATLAB Developed By : Wine Yard Technologies, Hyderabad www.wineyard.in 1|Page 14PE6 An Effective Control Method for Quasi-Z-Source Cascade Multilevel Inverter-Based Grid-Tie Single-Phase Photovoltaic Power System An effective control method, including system-level control and pulse width modulation for quasi-Z-source cascade multilevel inverter (qZS-CMI) based grid-tie photovoltaic (PV) power system is proposed. The system-level control achieves the grid-tie current injection, independent maximum power point tracking (MPPT) for separate PV panels, and dc-link voltage balance for all quasi-Z-source H-bridge inverter (qZS-HBI) modules. The complete design process is disclosed. A multilevel space vector modulation (SVM) for the single-phase qZS-CMI is proposed to fulfill the synthetization of the step-like voltage waveforms. Simulation and experiment based on a seven-level prototype are carried out to validate the proposed methods. Arecent upsurge in the study of photovoltaic (PV) power generation emerges, since they directly convert the solar radiation into electric power without hampering the environment. However, the stochastic fluctuation of solar power is inconsistent with the desired stable power injected to the grid, owing to variations of solar irradiation and temperature. To fully exploit the solar energy, extracting the PV panels’ maximum power and feeding them into grids at unity power factor become the most important. The contributions have been made by the cascade multilevel inverter (CMI) . www.wineyard.in 2|Page 14PE6 Nevertheless, the H-bridge inverter (HBI) module lacks boost function so that the inverter KVA rating requirement has to be increased twice with a PV voltage range of 1:2; and the different PV panel output voltages result in imbalanced dc-link voltages. The extra dc–dc boost converters were coupled to PV panel and HBI of the CMI to implement separate maximum power point tracking (MPPT) and dc-link voltage balance [3], [4]. However, each HBI module is a two-stage inverter, and many extra dc–dc converters not only increase the complexity of the power circuit and control and the system cost, but also decrease the efficiency. Conclusion: This paper proposed a control method for qZS-CMI based single-phase grid-tie PV system. The grid-injected power was fulfilled at unity power factor, all qZS-HBI modules separately achieved their own maximum power points tracking even if some modules’ PV panels had different conditions. Moreover, the independent dc-link voltage closed-loop control ensured all qZS-HBI modules have the balanced voltage, which provided the high quality output voltage waveform to the grid. The control parameters were well designed to ensure system stability and fast response. A multilevel SVM integrating with shoot through states was proposed to synthesize the staircase voltage waveform of the single-phase qZS-CMI. The simulation and experiment were carried out on the seven-level qZS-CMI prototype. The qZSCMI based grid-tie PV system was tested. The simulation and experimental results verified the proposed qZS-CMI based grid-tie PV power system and the proposed control method. In principle, the proposed system can work with the weak grid, even though this paper did not address this topic. In future work, we will focus on the application to the weak grid, and the detailed analysis and experimental results will be disclosed in the next paper www.wineyard.in 3|Page 14PE6 Screen shots: INPUT VOLTAGE INPUT (VOLTAGE&CURRENT&DC LINK ) OF H BRIDGES CORRESPANDINGLY www.wineyard.in 4|Page 14PE6 OUTPUT VOLTAGE OF QUASI Z SOURCE INVERTER OUTPUT CURRENT OF QUASI Z SOURCE INVERTER www.wineyard.in 5|Page