Title :
An effective control method for quasi-Z-source cascade multilevel three-phase grid-tie photovoltaic power system
Author :
Yushan Liu ; Abu-Rub, Haitham ; Baoming Ge ; Fang Zheng Peng
Author_Institution :
Sch. of Electr. Eng., Beijing Jiaotong Univ., Beijing, China
Abstract :
An effective control method for a three-phase quasi-Z-source cascade multilevel inverter (qZS-CMI) based grid-tie photovoltaic (PV) power system is proposed. The control scheme achieves distributed maximum power point tracking (MPPT) and independent dc-link voltage balance for all quasi-Z-source H-bridge inverter (qZS-HBI) based PV modules, and balanced three-phase grid-injected power for the qZS-CMI based PV system. A system-level modeling, which can be used to design the controllers, is also disclosed. Simulation and experiment are carried out on a 7-level qZS-CMI based PV system to validate the proposed scheme.
Keywords :
control system synthesis; invertors; maximum power point trackers; photovoltaic power systems; power generation control; 7-level qZS-CMI; MPPT; PV modules; balanced three-phase grid-injected power; controller design; distributed maximum power point tracking; effective control method; grid-tie photovoltaic power system; independent dc-link voltage; phase quasi-Z-source cascade multilevel inverter; qZS-HBI; quasi-Z-source H-bridge inverter; system-level modeling; Inverters; Maximum power point trackers; Phase modulation; Photovoltaic systems; Power systems; Voltage control; Quasi-Z-source inverter; cascade multilevel inverter; photovoltaic power system; three-phase grid-tie synchronization;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2014 Twenty-Ninth Annual IEEE
Conference_Location :
Fort Worth, TX
DOI :
10.1109/APEC.2014.6803539
