A multilevel current-source inverter based grid-connected photovoltaic system

This paper proposes a grid-connected Photovoltaic (PV) system based on a multilevel Current Source Inverter (CSI) topology. The topology proposed here consists of parallel-connected CSI modules operating at a very low switching frequency. For n number of inverter modules, 2n+1 current levels are resulted in the output. In the multilevel inverter topology, each inverter module has its own PV source, Maximum Power Point Tracking (MPPT) unit, and DC-link current controller. Unlike earlier proposed multilevel CSI topologies, the proposed topology has a single AC-side current controllers, lowering the requirements for AC-side sensors and filters. To demonstrate the performance of the multilevel inverter based on CSI, two inverter units are considered in this study. The simulation studies are carried out in PSCAD/EMTDC environment.

[1]  Marco Liserre,et al.  Multilevel Phase-Shifting Carrier PWM Technique in case of Non-Equal dc-Link Voltages , 2006, IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics.

[2]  Yao Zhang,et al.  A Generalized Three-Phase Multilevel Current Source Inverter with Carrier Phase-Shifted SPWM , 2007, 2007 IEEE Power Electronics Specialists Conference.

[3]  S.H. Hosseini,et al.  A new topology for multilevel current source inverter with reduced number of switches , 2009, 2009 International Conference on Electrical and Electronics Engineering - ELECO 2009.

[4]  R. Stephenson.  A and V , 1962, The British journal of ophthalmology.

[5]  L.M. Tolbert,et al.  Active harmonic elimination for multilevel converters , 2006, IEEE Transactions on Power Electronics.

[6]  Jaime Arau,et al.  A Different Multilevel Current-Source Inverter , 2010, IEEE Transactions on Industrial Electronics.

[7]  J.R. Espinoza,et al.  A novel multi-level converter based on current source power cell , 2008, 2008 IEEE Power Electronics Specialists Conference.

[8]  A. Yazdani,et al.  A Control Methodology and Characterization of Dynamics for a Photovoltaic (PV) System Interfaced With a Distribution Network , 2009, IEEE Transactions on Power Delivery.

[9]  Se-Kyo Chung,et al.  A phase tracking system for three phase utility interface inverters , 2000 .

[10]  R. H. Lasseter,et al.  Control Techniques for Multiple Current Source GTO Converters , 1995, IEEE Transactions on Industry Applications.

[11]  Zhang Bo,et al.  Double Closed-loop Control of Three-Phase Five-level PWM Current Source Inverter , 2007, IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society.

[12]  J.R. Espinoza,et al.  Multi-Level Three-Phase Current Source Inverter based Series Voltage Compensator , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.

[13]  B. Wu,et al.  Multilevel Current Source Inverters with Phase Shifted Trapezoidal PWM , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.

[14]  Jian-yu Bao,et al.  A new three-phase 5-level current-source inverter , 2005, Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, 2005. APEC 2005..