Quasi-Z source inverter with battery based PV power generation system

A new PV power generation topology, based on the quasi-Z source inverter (QZSI) with battery, is proposed in this paper. With a battery paralleled with one of the capacitors, this system can smooth the grid-injected/load power when the PV panel outputs a variable power with fluctuations. The battery can be charged or discharged without any extra circuit, because of the unique impedance network of QZSI. The operating principle and power flow of this system are analyzed. The closed-loop control strategy is used to achieve Maximum Power Point Tracking (MPPT) and keep the output voltage stable. Three operating modes of the proposed PV power generation system are simulated in the MATLAB/Simulink to verify its principle and theoretical analysis. A prototype is built in the lab, and the experimental results validate the whole system.

[1]  Yuan Li,et al.  Controller design for quasi-Z-source inverter in photovoltaic systems , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

[2]  Fang Zheng Peng,et al.  Application of Z-Source Inverter for Traction Drive of Fuel Cell—Battery Hybrid Electric Vehicles , 2007, IEEE Transactions on Power Electronics.

[3]  U. K. Madawala,et al.  A Battery Energy Storage interface for wind power systems with the use of grid side inverter , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

[4]  Zedong Zheng,et al.  Energy management of hybrid DC and AC bus linked microgrid , 2010, The 2nd International Symposium on Power Electronics for Distributed Generation Systems.

[5]  Fang Zheng Peng.  Z-source inverter , 2002 .

[6]  Yuan Li,et al.  Quasi-Z-Source Inverter for Photovoltaic Power Generation Systems , 2009, 2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition.

[7]  F.Z. Peng,et al.  Four quasi-Z-Source inverters , 2008, 2008 IEEE Power Electronics Specialists Conference.

[8]  G M Tina,et al.  Grid-connected photovoltaic system with battery storage system into market perspective , 2009, 2009 IEEE PES/IAS Conference on Sustainable Alternative Energy (SAE).