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AN EFFECTIVE CONTROL METHOD FOR QUASI-Z-SOURCE CASCADE MULTILEVEL INVERTER-BASED GRID-TIE SINGLE-PHASE PHOTOVOLTAIC POWER SYSTEM  

AN EFFECTIVE CONTROL METHOD FOR QUASI-Z-SOURCE CASCADE MULTILEVEL INVERTER-BASED GRID-TIE SINGLE-PHASE PHOTOVOLTAIC POWER SYSTEM  

 

ABSTRACT:

         An effective control method, including system-level control and pulsewidth 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.

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