Unified MPPT Control Strategy for Z-Source Inverter Based Photovoltaic Power Conversion Systems

Z-source inverters (ZSI) are used to realize both DC voltage boost and DC-AC inversion in single stage with a reduced number of power switching devices. A traditional MPPT control algorithm provides a shoot-through interval which should be inserted in the switching waveforms of the inverter to output the maximum power to the Z-network. At this instant, the voltage across the Z-source capacitor is equal to the output voltage of a PV array at the maximum power point (MPP). The control of the Z-source capacitor voltage beyond the MPP voltage of a PV array is not facilitated in traditional MPPT algorithms. This paper presents a unified MPPT control algorithm to simultaneously achieve MPPT as well as Z-source capacitor voltage control. Development and implementation of the proposed algorithm and a comparison with traditional results are discussed. The effectiveness of the proposed unified MPPT control strategy is implemented in Matlab/Simulink software and verified by experimental results.

[1]  S. Thangaprakash,et al.  Implementation and Critical Investigation on Modulation Schemes of Three Phase Impedance Source Inverter , 2010 .

[2]  K.M. Smedley,et al.  A cost-effective single-stage inverter with maximum power point tracking , 2004, IEEE Transactions on Power Electronics.

[3]  V. P. Sundarsingh,et al.  Novel grid-connected photovoltaic inverter , 1996 .

[4]  Hong-Hee Lee,et al.  Algorithms for Controlling Both the DC Boost and AC Output Voltage of Z-Source Inverter , 2007, IEEE Transactions on Industrial Electronics.

[5]  B. Piepenbreier,et al.  Dimensioning of the Z-source inverter for general purpose drives with three-phase standard motors , 2008, 2008 IEEE Power Electronics Specialists Conference.

[6]  F.Z. Peng,et al.  Z-source inverter for adjustable speed drives , 2003, IEEE Power Electronics Letters.

[7]  I.H. Altas,et al.  A Photovoltaic Array Simulation Model for Matlab-Simulink GUI Environment , 2007, 2007 International Conference on Clean Electrical Power.

[8]  S. Thangaprakash,et al.  Performance Improvement of Z-Source Inverter-Fed Induction Motor Drives Using Modified Voltage Space Vector , 2010 .

[9]  A. Krishnan,et al.  Analysis of Advanced Pulse-Width Modulation Schemes for Z-Source Inverters , 2011 .

[10]  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.

[11]  F.Z. Peng,et al.  Maximum boost control of the Z-source inverter , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[12]  N. Kasa,et al.  Maximum power point tracking with capacitor identifier for photovoltaic power system , 2000 .

[13]  Joung-Hu Park,et al.  New MPPT Control Strategy for Two-Stage Grid-Connected Photovoltaic Power Conditioning System , 2007 .

[14]  A. Keyhani,et al.  Control of a Fuel Cell Based Z-Source Converter , 2007, IEEE Transactions on Energy Conversion.

[15]  Poh Chiang Loh,et al.  Development of a Comprehensive Model and a Multiloop Controller for $Z$-Source Inverter DG Systems , 2007, IEEE Transactions on Industrial Electronics.

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

[17]  Poh Chiang Loh,et al.  Pulse-width modulation of Z-source inverters , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[18]  C. V. Nayar,et al.  A Cost Effective Energy Saving of Fluorescent Lighting in Commercial Buildings , 2012 .

[19]  F.Z. Peng,et al.  Comparison of Traditional Inverters and $Z$ -Source Inverter for Fuel Cell Vehicles , 2004, IEEE Transactions on Power Electronics.

[20]  X. Zhang,et al.  An integrated inverter for a single-phase single-stage grid-connected PV system based on Z-source , 2007 .

[21]  Fang Zheng Peng,et al.  Z-Source Inverters, Controls, and Motor Drive Applications , 2005 .

[22]  F.Z. Peng.  Z-source inverter for motor drives , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[23]  S. Thangaprakash,et al.  Current Mode Integrated Control Technique for Z-Source Inverter Fed Induction Motor Drives , 2010 .

[24]  Tae-Won Chun,et al.  Minimization of Voltage Stress across Switching Devices in the Z-Source Inverter by Capacitor Voltage Control , 2009 .

[25]  Robert L. Steigerwald,et al.  Microcomputer Control of a Residential Photovoltaic Power Conditioning System , 1985, IEEE Transactions on Industry Applications.

[26]  Henry Shu-Hung Chung,et al.  An integrated inverter with maximum power tracking for grid-connected PV systems , 2005 .

[27]  F.Z. Peng,et al.  $Z$-Source Inverter for Residential Photovoltaic Systems , 2006, IEEE Transactions on Power Electronics.

[28]  S. Thangaprakash,et al.  Integrated Control Algorithm for an Effective Control of Z-Source Inverter Using Modified Voltage Space Vector , 2010 .

[29]  Shaojun Xie,et al.  Improved Z-Source Inverter With Reduced Z-Source Capacitor Voltage Stress and Soft-Start Capability , 2009, IEEE Transactions on Power Electronics.

[30]  Andres Barrado,et al.  Review of the maximum power point tracking algorithms for stand-alone photovoltaic systems , 2006 .

[31]  Fan Zhang,et al.  Unified control technique for Z-Source inverter , 2008, 2008 IEEE Power Electronics Specialists Conference.

[32]  V. Agarwal,et al.  A Single-Stage Grid Connected Inverter Topology for Solar PV Systems With Maximum Power Point Tracking , 2007, IEEE Transactions on Power Electronics.

[33]  Yang Shuying.  Study of Z-source Inverter for Grid-connected PV Systems , 2009 .

[34]  F. Blaabjerg,et al.  A review of single-phase grid-connected inverters for photovoltaic modules , 2005, IEEE Transactions on Industry Applications.

[35]  Heung-Geun Kim,et al.  Power Conditioning System for a Grid Connected PV Power Generation Using a Quasi-Z-Source Inverter , 2010 .