Simplified Feedback Linearization Control of Three-Phase Photovoltaic Inverter With an LCL Filter

The conventional grid-connected photovoltaic (PV) inverter is controlled by a dual-loop control strategy in synchronous reference frame, and the controllers are designed for steady-state operating point based on the small signal model by neglecting the high-order and coupling terms. However, in an LCL filter, the coupling terms are complicated due to the dq transformation which will affect the dynamic performance. In this paper, an innovative simplified feedback linearization (SFL) control strategy is proposed for the PV inverter with the LCL filter, which offers satisfactory performance, particularly, in decoupling the control system, improving the dynamic performance, and enhancing the adaptability. Furthermore, the SFL controllers are simpler than the high-order tracking controllers used in conventional feedback linearization control. The detailed simplification process and accurate transfer functions for SFL control strategy have been presented, and the performance comparisons between the proposed SFL control strategy and the classical dual-loop method are carried out to show the characteristics of the proposed control algorithm. Finally, a laboratory prototype of a 150-kW PV inverter with the LCL filter has been implemented to test the feasibility and effectiveness of the proposed strategy. The proposed SFL control strategy can also be applied to a higher order system or other power converters.

[1]  M. Liserre,et al.  Genetic algorithm-based design of the active damping for an LCL-filter three-phase active rectifier , 2003, IEEE Transactions on Power Electronics.

[2]  Joachim Rudolph,et al.  On Some Nonlinear Current Controllers for Three-Phase Boost Rectifiers , 2009, IEEE Transactions on Industrial Electronics.

[3]  Donald Grahame Holmes,et al.  Grid current regulation of a three-phase voltage source inverter with an LCL input filter , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[4]  Yun Wei Li,et al.  Generalized Closed-Loop Control Schemes with Embedded Virtual Impedances for Voltage Source Converters with LC or LCL Filters , 2012, IEEE Transactions on Power Electronics.

[5]  J. Van den Keybus,et al.  Model-based generation of low distortion currents in grid-coupled PWM-inverters using an LCL output filter , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[6]  P. K. Jain,et al.  A Control Design Approach for Three-Phase Grid-Connected Renewable Energy Resources , 2011, IEEE Transactions on Sustainable Energy.

[7]  Dehong Xu,et al.  An Improved Control Strategy for Grid-Connected Voltage Source Inverters With an LCL Filter , 2006, IEEE Transactions on Power Electronics.

[8]  J L Agorreta,et al.  Modeling and Control of $N$ -Paralleled Grid-Connected Inverters With LCL Filter Coupled Due to Grid Impedance in PV Plants , 2011, IEEE Transactions on Power Electronics.

[9]  Jih-Sheng Lai,et al.  Admittance Compensation in Current Loop Control for a Grid-Tie LCL Fuel Cell Inverter , 2008 .

[10]  J. Fernando A. da Silva,et al.  Sliding-mode control of boost-type unity-power-factor PWM rectifiers , 1999, IEEE Trans. Ind. Electron..

[11]  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.

[12]  Hasan Komurcugil,et al.  Lyapunov-based control for three-phase PWM AC/DC voltage-source converters , 1998 .

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

[14]  Dong-Choon Lee,et al.  DC-bus voltage control of three-phase AC/DC PWM converters using feedback linearization , 2000 .

[15]  K. Acharya,et al.  Multiple Lyapunov Function Based Reaching Condition for Orbital Existence of Switching Power Converters , 2008, IEEE Transactions on Power Electronics.

[16]  Massimo Vitelli,et al.  A Technique for Improving P&O MPPT Performances of Double-Stage Grid-Connected Photovoltaic Systems , 2009, IEEE Transactions on Industrial Electronics.

[17]  T.G. Habetler,et al.  High-performance induction motor speed control using exact feedback linearization with state and state derivative feedback , 2003, IEEE Transactions on Power Electronics.

[18]  D. Soto,et al.  Nonlinear control strategies for cascaded multilevel STATCOMs , 2004, IEEE Transactions on Power Delivery.

[19]  Federico Delfino,et al.  A Feedback Linearization Control Scheme for the Integration of Wind Energy Conversion Systems Into Distribution Grids , 2012, IEEE Systems Journal.

[20]  Zhengming Zhao,et al.  Grid-connected photovoltaic power systems: Technical and potential problems—A review , 2010 .

[21]  Xinbo Ruan,et al.  Full Feedforward of Grid Voltage for Grid-Connected Inverter With LCL Filter to Suppress Current Distortion Due to Grid Voltage Harmonics , 2010, IEEE Transactions on Power Electronics.

[22]  E.J. Bueno,et al.  Exact Linearization Nonlinear Neutral-Point Voltage Control for Single-Phase Three-Level NPC Converters , 2009, IEEE Transactions on Power Electronics.

[23]  Jinhwan Jung,et al.  A feedback linearizing control scheme for a PWM converter-inverter having a very small DC-link capacitor , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[24]  M. Castilla,et al.  Feedback Linearization of a Single-Phase Active Power Filter via Sliding Mode Control , 2008, IEEE Transactions on Power Electronics.

[25]  F. Fnaiech,et al.  A DSP-based implementation of a nonlinear model reference adaptive control for a three-phase three-level NPC boost rectifier prototype , 2005, IEEE Transactions on Power Electronics.

[26]  Dong-Choon Lee,et al.  Feedback Linearization Control of Three-Phase UPS Inverter Systems , 2010, IEEE Transactions on Industrial Electronics.

[27]  D.-C. Lee.  Advanced nonlinear control of three-phase PWM rectifiers , 2000 .

[28]  Heung-Geun Kim,et al.  LVRT Scheme of PMSG Wind Power Systems Based on Feedback Linearization , 2012, IEEE Transactions on Power Electronics.

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

[30]  M. Liserre,et al.  Design and control of an LCL-filter based three-phase active rectifier , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[31]  Farhat Fnaiech,et al.  Linear and Nonlinear Control Techniques for a Three-Phase Three-Level NPC Boost Rectifier , 2006, IEEE Transactions on Industrial Electronics.

[32]  Tzann-Shin Lee,et al.  Input-output linearization and zero-dynamics control of three-phase AC/DC voltage-source converters , 2003 .

[33]  G. Garcera,et al.  Sensitivity Study of the Dynamics of Three-Phase Photovoltaic Inverters With an LCL Grid Filter , 2009, IEEE Transactions on Industrial Electronics.

[34]  Chung-Cheng Chen,et al.  Feedback Linearization Control and Its Application to MIMO Cancer Immunotherapy , 2010, IEEE Transactions on Control Systems Technology.

[35]  H. Pinheiro,et al.  Design and Implementation of a Robust Current Controller for VSI Connected to the Grid Through an LCL Filter , 2009, IEEE Transactions on Power Electronics.

[36]  P.L. Chapman,et al.  Comparison of Photovoltaic Array Maximum Power Point Tracking Techniques , 2007, IEEE Transactions on Energy Conversion.

[37]  Yu Zhang,et al.  Full Feedforward of Grid Voltage for Discrete State Feedback Controlled Grid-Connected Inverter With LCL Filter , 2012, IEEE Transactions on Power Electronics.

[38]  Marian P. Kazmierkowski,et al.  Current control techniques for three-phase voltage-source PWM converters: a survey , 1998, IEEE Trans. Ind. Electron..

[39]  Tzann-Shin Lee.  Nonlinear state feedback control design for three-phase PWM boost rectifiers using extended linearisation , 2003 .

[40]  Dehong Xu,et al.  An improved control strategy for grid-connected voltage source inverters with a LCL filter , 2006, Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06..

[41]  Dushan Boroyevich,et al.  Control of circulating current in two parallel three-phase boost rectifiers , 2002 .

[42]  Meral Altinay,et al.  Simulation of three - phase voltage source pulse width modulated (PWM) LCL filtered rectifier based on input - output linearization nonlinear control , 2010, 2010 12th International Conference on Optimization of Electrical and Electronic Equipment.

[43]  이나영,et al.  외란 관측기법을 이용한 영구자석형 동기 전동기의 비선형 속도 제어 = A nonlinear speed control for a PM synchronous motor using a simple disturbance estimation technique , 2001 .

[44]  M. Liserre,et al.  Genetic algorithm based design of the active damping for a LCL-filter three-phase active rectifier , 2004, Eighteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2003. APEC '03..

[45]  T. G. Habetler,et al.  High-performance induction motor speed control using exact feedback linearization with state and state derivative feedback , 2004 .