Pulse width amplitude modulation based single-phase quasi-Z-source photovoltaic inverter with energy storage battery

The pulse width amplitude modulation (PWAM) was earlier proposed for the single-phase quasi-Z source inverter (qZSI) based photovoltaic (PV) power system to reduce qZS impedance values while improving efficiency. The method resulted in highly fluctuated qZS inductor currents and capacitor voltages as well, which makes it difficult to integrate energy storage battery as a conventional qZSI. This paper proposes an improved topology with energy storage elements for the PWAM-based single-phase qZS PV inverter, maintaining constant battery current. Also, control strategy is disclosed for grid-connected and islanding operation. Simulation and experimental results verify the proposed approach for dual-mode operation of the PWAM-based single-phase qZS PV power system.

[1]  F. Zare,et al.  Hysteresis Band Current Control for a Single Phase Z-source Inverter with Symmetrical and Asymmetrical Z-network , 2007, 2007 Power Conversion Conference - Nagoya.

[2]  Baoming Ge,et al.  Reliability, efficiency, and cost comparisons of MW-scale photovoltaic inverters , 2012, 2012 IEEE Energy Conversion Congress and Exposition (ECCE).

[3]  Baoming Ge,et al.  A hybrid modulation method for single-phase quasi-Z source inverter , 2014, 2014 IEEE Energy Conversion Congress and Exposition (ECCE).

[4]  Frede Blaabjerg,et al.  Impedance-Source Networks for Electric Power Conversion Part I: A Topological Review , 2015, IEEE Transactions on Power Electronics.

[5]  Wang Jian-ze.  Suppression of Voltage Fluctuation on DC Link Voltage of Z-source , 2011 .

[6]  Hui Li,et al.  A High-Performance Photovoltaic Module-Integrated Converter (MIC) Based on Cascaded Quasi-Z-Source Inverters (qZSI) Using eGaN FETs , 2013, IEEE Transactions on Power Electronics.

[7]  F. Blaabjerg,et al.  Power electronics for renewable energy systems , 2006, 2009 International Conference on Power Engineering, Energy and Electrical Drives.

[8]  Baoming Ge,et al.  Hybrid pulsewidth modulated single-phase quasi-Z-source grid-tie Photovoltaic power system , 2015, 2015 IEEE Applied Power Electronics Conference and Exposition (APEC).

[9]  Xiao Li,et al.  Control strategy for seamless transfer between island and grid-connected operation for a dual-mode photovoltaic inverter , 2015, 2015 IEEE Energy Conversion Congress and Exposition (ECCE).

[10]  Qianfan Zhang,et al.  Single-phase Z-Source inverter: Analysis and Low-frequency Harmonics Elimination Pulse Width Modulation , 2011, 2011 IEEE Energy Conversion Congress and Exposition.

[11]  Yuan Li,et al.  Quasi-Z-Source inverter with energy storage for Photovoltaic power generation systems , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[12]  Ming Zhang,et al.  Circulating Harmonic Current Elimination of a CPS-PWM-Based Modular Multilevel Converter With a Plug-In Repetitive Controller , 2014, IEEE Transactions on Power Electronics.

[13]  Baoming Ge,et al.  An Effective Control Method for Quasi-Z-Source Cascade Multilevel Inverter-Based Grid-Tie Single-Phase Photovoltaic Power System , 2014, IEEE Transactions on Industrial Informatics.

[14]  Hui Li,et al.  A capacitance minimization control strategy for single-phase PV quasi-Z-source inverter , 2015, 2015 IEEE Applied Power Electronics Conference and Exposition (APEC).