Review, analysis and improving the utilization factor of a PV-grid connected system via HERIC transformerless approach

This paper proposed an improved Highly Efficient and Reliable Inverter Concept (HERIC) inverter with photovoltaic (PV)-grid connected power system. However, transformerless inverter based on HERIC topology is considered as one of the most reliable, efficient, and approximately leakage free inverters with the PV-grid connected systems. The main drawback of this inverter is drawing a discontinuous current from the photovoltaic generating unit. Also, continuous photovoltaic current is needed to guarantee the maximum power point tracking (MPPT) operation. Subsequently, the operation of the HERIC inverter at maximum power point tracking condition is not a clear issue. Therefore, the PV utilization factor (Kuf) value falls down to about 50%, which leads to increasing in the cost and size of the photovoltaic generator unit. In this study, derivation of the utilization factor based on the PV-grid connected through HERIC inverter analyses are presented. Also, an improved version of the HERIC inverter is introduced to remove the previous drawbacks. To validate the analysis and idea, digital simulation results are carried out for both the proposed and classical PV-grid via HERIC inverter system. The transient response of the proposed grid current controller, proportion resonance (PR) controller, is tested. The effects of parameters uncertainties on the system performance factors are also studied to validate the robustness of the control approach.

[1]  Josep M. Guerrero,et al.  Linear Current Control Scheme With Series Resonant Harmonic Compensator for Single-Phase Grid-Connected Photovoltaic Inverters , 2008, IEEE Transactions on Industrial Electronics.

[2]  D. P. Atherton,et al.  Automatic tuning of optimum PID controllers , 1993 .

[3]  Haibing Hu,et al.  Power decoupling techniques for micro-inverters in PV systems-a review , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

[4]  Tamas Kerekes.  Analysis and Modeling of Transformerless Photovoltaic Inverter Systems , 2009 .

[5]  Li Zhang,et al.  H6 Transformerless Full-Bridge PV Grid-Tied Inverters , 2014, IEEE Transactions on Power Electronics.

[6]  M. Adly,et al.  A meta-heuristics search algorithm as a solution for energy transfer maximization in stand-alone photovoltaic systems , 2013 .

[7]  Nasrudin Abd Rahim,et al.  A Highly Efficient Single-phase Transformerless H-bridge Inverter for Reducing Leakage Ground Current in Photovoltaic Grid-connected System , 2015 .

[8]  Huijun Gao,et al.  Extended State Observer-Based Sliding-Mode Control for Three-Phase Power Converters , 2017, IEEE Transactions on Industrial Electronics.

[9]  Yongheng Yang,et al.  Overview of Single-phase Grid-connected Photovoltaic Systems , 2015 .

[10]  Frede Blaabjerg,et al.  Proportional-resonant controllers and filters for grid-connected voltage-source converters , 2006 .

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

[12]  Changliang Xia,et al.  Topology Review and Derivation Methodology of Single-Phase Transformerless Photovoltaic Inverters for Leakage Current Suppression , 2015, IEEE Transactions on Industrial Electronics.

[13]  S. B. Kjaer,et al.  Evaluation of the “Hill Climbing” and the “Incremental Conductance” Maximum Power Point Trackers for Photovoltaic Power Systems , 2012, IEEE Transactions on Energy Conversion.

[14]  J.M.A. Myrzik,et al.  String and module integrated inverters for single-phase grid connected photovoltaic systems - a review , 2003, 2003 IEEE Bologna Power Tech Conference Proceedings,.

[15]  Song Xing,et al.  Unifying Electrical Engineering and Electronics Engineering , 2014 .

[16]  Weiping Zhang,et al.  A Review of Current Control Strategy for Single-Phase Grid-Connected Inverters , 2014 .

[17]  F. Blaabjerg,et al.  Flexible control of small wind turbines with grid failure detection operating in stand-alone and grid-connected mode , 2004, IEEE Transactions on Power Electronics.

[18]  J. Doval-Gandoy,et al.  Eliminating Ground Current in a Transformerless Photovoltaic Application , 2010, IEEE Transactions on Energy Conversion.

[19]  Xiaozhan Yang,et al.  Robust Model-Based Fault Diagnosis for PEM Fuel Cell Air-Feed System , 2016, IEEE Transactions on Industrial Electronics.

[20]  Vladimir Blasko,et al.  A novel control method of a VSC without AC line voltage sensors , 2001 .

[21]  Salah Laghrouche,et al.  Observer-based higher order sliding mode control of power factor in three-phase AC/DC converter for hybrid electric vehicle applications , 2013, Int. J. Control.

[22]  Enrique Romero-Cadaval,et al.  Grid-Connected Photovoltaic Generation Plants: Components and Operation , 2013, IEEE Industrial Electronics Magazine.

[23]  Chen Yao,et al.  A Systematic Method for Designing a PR Controller and Active Damping of the LCL Filter for Single-Phase Grid-Connected PV Inverters , 2014 .

[24]  Tore Undeland,et al.  Power Electronics: Converters, Applications and Design , 1989 .

[25]  Quan Li,et al.  A Review of the Single Phase Photovoltaic Module Integrated Converter Topologies With Three Different DC Link Configurations , 2008, IEEE Transactions on Power Electronics.

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

[27]  Shaojun Xie,et al.  Leakage Current Analytical Model and Application in Single-Phase Transformerless Photovoltaic Grid-Connected Inverter , 2010, IEEE Transactions on Electromagnetic Compatibility.

[28]  Leopoldo G. Franquelo,et al.  Grid-Connected Photovoltaic Systems: An Overview of Recent Research and Emerging PV Converter Technology , 2015, IEEE Industrial Electronics Magazine.

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

[30]  Ahmed M. Kassem,et al.  MPPT control design and performance improvements of a PV generator powered DC motor-pump system based on artificial neural networks , 2012 .

[31]  Frede Blaabjerg,et al.  Overview of Control and Grid Synchronization for Distributed Power Generation Systems , 2006, IEEE Transactions on Industrial Electronics.