An Overview of DC Component Generation, Detection and Suppression for Grid-Connected Converter Systems

Transformerless grid-connected distributed photovoltaic (PV) systems (TGCDPVs) has the merits of high efficiency, small size, and low cost, draws great interest in recent years. However, Direct Current (DC) injection is a serious issue in TGCDPVS, which degrade its power quality. Some publications have discussed DC component generation and suppression methods; however, there are very few systematic reviews on the generation, detection, and suppression of DC component in TGCDPVS. For young researchers and designers working in photovoltaic power generation systems, the DC injection suppression is of great importance. This paper first reviews a number of issues related with dc component in TGCDPVs, the DC current generation and its detriments to the grid are reviewed at first, then, a comprehensive review on the latest DC detection method are performed, finally, various DC suppression solutions are given. Comparisons between various DC component detection and suppression methods are discussed. In the end, some future suggestions are given. This review shall provide a useful guideline and a clearer vision for researchers to determine the best solution for DC suppression in their PV product.

[1]  Wei Wang,et al.  DC Injection Control for Grid-Connected Single-Phase Inverters Based on Virtual Capacitor , 2015 .

[2]  A. Ahfock,et al.  Direct current offset controller for transformerless single-phase photovoltaic grid-connected inverters , 2010 .

[3]  Tsai-Fu Wu,et al.  PV Power Injection and Active Power Filtering With Amplitude-Clamping and Amplitude-Scaling Algorithms , 2007, IEEE Transactions on Industry Applications.

[4]  Jia Da.  Causes and suppression of DC injection for single-phase photovoltaic inverter , 2014 .

[5]  Paolo Mattavelli,et al.  Coupled-Inductor-Based DC Current Measurement Technique for Transformerless Grid-Tied Inverters , 2018, IEEE Transactions on Power Electronics.

[6]  Dehong Xu,et al.  A Novel DC Current Injection Suppression Method for Three-Phase Grid-Connected Inverter Without the Isolation Transformer , 2018, IEEE Transactions on Industrial Electronics.

[7]  Ronald Sharma.  Removal of DC offset current from transformerless PV inverters connected to utility , 2005 .

[8]  Yong Chen,et al.  An intelligent dc current minimization method for transformerless grid-connected photovoltaic inverters. , 2019, ISA transactions.

[9]  Roberto González,et al.  Transformerless Single-Phase Multilevel-Based Photovoltaic Inverter , 2008, IEEE Transactions on Industrial Electronics.

[10]  P. Sanchis,et al.  Transformerless Inverter for Single-Phase Photovoltaic Systems , 2007, IEEE Transactions on Power Electronics.

[11]  Yi Tang,et al.  Mitigation of DC and Harmonic Currents Generated by Voltage Measurement Errors and Grid Voltage Distortions in Transformerless Grid-Connected Inverters , 2018, IEEE Transactions on Energy Conversion.

[12]  Pablo Sanchis,et al.  Ground currents in single-phase transformerless photovoltaic systems , 2007 .

[13]  David J. Atkinson,et al.  Approach to low-cost prevention of DC injection in transformerless grid connected inverters , 2010 .

[14]  Mei Qiang,et al.  Real-time DC injection measurement technique for transformerless PV systems , 2010, The 2nd International Symposium on Power Electronics for Distributed Generation Systems.

[15]  H. Haeberlin,et al.  Evolution of Inverters for Grid connected PV-Systems from 1989 to 2000 , 2001 .

[16]  Hembram Mansing.  A Cascaded Inverter For Transformerless Single Phase Grid Connected Photovoltaic Systems , 2013 .

[17]  D. Atkinson,et al.  A review of minimisation of output DC current component methods in single-phase grid-connected inverters PV applications , 2012, 2012 2nd International Symposium On Environment Friendly Energies And Applications.

[18]  Matthew Armstrong,et al.  A new approach of prevention of DC current component in transformerless grid-connected PV inverter application , 2014, 2014 IEEE 5th International Symposium on Power Electronics for Distributed Generation Systems (PEDG).

[19]  Alessandro Ferrero,et al.  A linearization method for commercial Hall-effect current transducers , 2001, IEEE Trans. Instrum. Meas..

[20]  C.M. Johnson,et al.  Auto-Calibrating DC Link Current Sensing Technique for Transformerless, Grid Connected, H-Bridge Inverter Systems , 2006, IEEE Transactions on Power Electronics.

[21]  Toshihisa Shimizu,et al.  A novel high-performance utility-interactive photovoltaic inverter system , 2003 .

[22]  Dehong Xu,et al.  A Novel Control Strategy of Suppressing DC Current Injection to the Grid for Single-Phase PV Inverter , 2015, IEEE Transactions on Power Electronics.

[23]  Tony Ahfock,et al.  DC offset elimination in a single-phase grid-connected photovoltaic system , 2006 .

[24]  Emilio Olias,et al.  Overview of the legislation of DC injection in the network for low voltage small grid-connected PV systems in Spain and other countries , 2008 .

[25]  Ashraf Ahmed,et al.  Precise detection and elimination of grid injected DC from single phase inverters , 2012 .

[26]  Baocheng Wang,et al.  DC injection control for transformerless PV grid-connected inverters , 2009 .

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

[28]  Guo Xiaoqiang,et al.  DC injection control for grid-connected inverters based on virtual capacitor concept , 2008, 2008 International Conference on Electrical Machines and Systems.

[29]  E. Olias,et al.  DC Current Injection Into the Network from PV Grid Inverters , 2006, 2006 IEEE 4th World Conference on Photovoltaic Energy Conference.

[30]  Yong Chen,et al.  Design and implementation of a virtual capacitor based DC current suppression method for grid-connected inverters. , 2019, ISA transactions.

[31]  Slobodan N. Vukosavic,et al.  High-Precision Active Suppression of DC Bias in AC Grids by Grid-Connected Power Converters , 2017, IEEE Transactions on Industrial Electronics.

[32]  G. Franceschini,et al.  A DC Offset Current Compensation Strategy in Transformerless Grid-Connected Power Converters , 2011, IEEE Transactions on Power Delivery.

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

[34]  Yang Lian.  DC component suppression strategy for single-phase grid-connected inverter , 2015 .