Cascaded H-Bridge MV Grid and Power Balance Control for PV Systems

In this paper, a new centralized cascaded H-bridge medium-voltage (MV) grid topology model based on the three-phase power system is established and presented, including its control strategy. The influence that the power supply imbalance between three phases which caused by PV array partial shading or module mismatch of Cascaded H-Bridge is analyzed as well, based on which the power balance control algorithm is put forward. Simulation and experimental results show that the algorithm is effective and reliable, it improves the conversion efficiency and grid-connected power quality, solves the key problem of cascaded H-bridge topology used in three-phase system, provides a theoretical basis for the development of new high-power photovoltaic grid-connected inverter.

[1]  Chris S. Edrington,et al.  Analysis and control of a multi-string photovoltaic (PV) system interfaced with a utility grid , 2010, IEEE PES General Meeting.

[2]  F. Blaabjerg,et al.  Power electronics as efficient interface in dispersed power generation systems , 2004, IEEE Transactions on Power Electronics.

[3]  Zhao Jianfeng.  A Non-isolated Three-level Dual Buck Photovoltaic Grid-connected Inverter , 2012 .

[4]  Lin Ma,et al.  Comparison of the topologies of high efficiency neutral point clamping photovoltaic inverters , 2011 .

[5]  O. Wasynczuk.  Modeling and Dynamic Performance of a Line-Commutated Photovoltaic Inverter System , 1989, IEEE Power Engineering Review.

[6]  Remus Teodorescu,et al.  A New High-Efficiency Single-Phase Transformerless PV Inverter Topology , 2011, IEEE Transactions on Industrial Electronics.

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

[8]  Zhengming Zhao,et al.  Overview of Large-scale Grid-connected Photovoltaic Power Plants , 2011 .

[9]  Jih-Sheng Lai,et al.  Derivation, Analysis, and Implementation of a Boost–Buck Converter-Based High-Efficiency PV Inverter , 2012, IEEE Transactions on Power Electronics.

[10]  Pablo Correa,et al.  Control of a Single-Phase Cascaded H-Bridge Multilevel Inverter for Grid-Connected Photovoltaic Systems , 2009, IEEE Transactions on Industrial Electronics.

[11]  V. Quintana,et al.  Hierarchical State Estimation Using a Fast Rectangular-Coordinate Method , 1989 .

[12]  D. Biel,et al.  Energy-Sampled Data Modeling of a Cascade H-Bridge Multilevel Converter for Grid-connected PV Systems , 2006, 2006 IEEE International Power Electronics Congress.

[13]  J. Rodriguez,et al.  NPC multilevel multistring topology for large scale grid connected photovoltaic systems , 2010, The 2nd International Symposium on Power Electronics for Distributed Generation Systems.

[14]  E. Gubia,et al.  Cascaded H-bridge multilevel converter for grid connected photovoltaic generators with independent maximum power point tracking of each solar array , 2003, IEEE 34th Annual Conference on Power Electronics Specialist, 2003. PESC '03..

[15]  Zeng Yi.  Neutral Point Voltage Balance Control of Multi-Level Grid-Connected PV Inverters , 2011 .

[16]  Bin Wu,et al.  Recent Advances and Industrial Applications of Multilevel Converters , 2010, IEEE Transactions on Industrial Electronics.

[17]  Jaeger-Waldau Arnulf.  PV Status Report 2010 , 2010 .

[18]  Alex Huang,et al.  A new wide input range high efficiency photovoltaic inverter , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

[19]  Wang Cong.  Synthesis and Optimization of SVPWM for Three-level NPC PV Inverter , 2012 .