Derivation of a global model of a two-stage photovoltaic microinverter using sliding-mode control

This paper develops a global model of a two-stage grid-connected microinverter which uses sliding-mode control laws in both stages. In the study, it is considered that the microinverter is fed by a current source representing the photovoltaic module with a capacitor connected in parallel. The model of the DC-DC stage is obtained from the linearization of the ideal sliding dynamics of the converter considering that it is controlled through the input current. The DC-AC stage tied to the grid is considered as the load of the DC-DC stage. This representation allows including the voltage regulation loop used to stabilize the DC-link voltage through the value of the output current. The model is used to evaluate the local stability of the DC-link of the microinverter which represents the power balance of the system. The results are validated by means of simulations and experimental results.

[1]  Kai Sun,et al.  A Modular Grid-Connected Photovoltaic Generation System Based on DC Bus , 2011, IEEE Transactions on Power Electronics.

[2]  Dome Sulong,et al.  Design and implementation of a microinverter for solar PV rooftops , 2015, 2015 12th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON).

[3]  J. Bordonau,et al.  Topologies of single-phase inverters for small distributed power generators: an overview , 2004, IEEE Transactions on Power Electronics.

[4]  G. García,et al.  Robust Sliding-Mode Control Design for a Voltage Regulated Quadratic Boost Converter , 2015, IEEE Transactions on Power Electronics.

[5]  Oswaldo Lopez Santos,et al.  Contribution to the DC-AC conversion in photovoltaic systems : Module oriented converters , 2015 .

[6]  Luis Martinez-Salamero,et al.  Non-linear control of the output stage of a solar microinverter , 2017, Int. J. Control.

[7]  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.

[8]  F. Blaabjerg,et al.  Review and Comparison of Step-Up Transformerless Topologies for Photovoltaic AC-Module Application , 2013, IEEE Transactions on Power Electronics.

[9]  Hadeed Ahmed Sher,et al.  Micro-inverters — Promising solutions in solar photovoltaics , 2012 .

[10]  J. A. Morales-Saldana,et al.  Modelling and control of a DC-DC quadratic boost converter with R 2 P 2 , 2014 .

[11]  M. Karimi-Ghartemani,et al.  A Systematic Approach to DC-Bus Control Design in Single-Phase Grid-Connected Renewable Converters , 2013, IEEE Transactions on Power Electronics.

[12]  Luis Martinez-Salamero,et al.  Efficiency analysis of a sliding-mode controlled quadratic boost converter , 2013 .

[13]  Vadim I. Utkin,et al.  Sliding mode control in electromechanical systems , 1999 .

[14]  Weidong Xiao,et al.  Dynamic Modeling and Control of Interleaved Flyback Module-Integrated Converter for PV Power Applications , 2014, IEEE Transactions on Industrial Electronics.

[15]  Jan T. Bialasiewicz,et al.  Power-Electronic Systems for the Grid Integration of Renewable Energy Sources: A Survey , 2006, IEEE Transactions on Industrial Electronics.

[16]  Javier Calvente,et al.  Synthesis of loss-free resistors based on sliding-mode control and its applications in power processing , 2013 .

[17]  F. Blaabjerg,et al.  Power inverter topologies for photovoltaic modules-a review , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[18]  Hui Li,et al.  A High-Performance Photovoltaic Module-Integrated Converter (MIC) Based on Cascaded Quasi-Z-Source Inverters (qZSI) Using eGaN FETs , 2013, IEEE Transactions on Power Electronics.

[19]  Fritz Schimpf,et al.  Grid connected Converters for Photovoltaic, State of the Art, Ideas for Improvement of Transformerless Inverters , 2008 .

[20]  Emilio Figueres,et al.  Modeling and control of a push–pull converter for photovoltaic microinverters operating in island mode , 2011 .

[21]  Germain Garcia,et al.  A simple digital sinusoidal reference generator for grid-synchronized power electronics applications , 2015, 2015 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA).

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

[23]  Luis Martinez-Salamero,et al.  Sliding-mode control of a transformer-less dual-stage grid-connected photovoltaic micro-inverter , 2013, 10th International Multi-Conferences on Systems, Signals & Devices 2013 (SSD13).