First-order Generalized Integrator Based Frequency Locked Loop and Synchronization for Three-Phase Grid-connected Converters under Adverse Grid Conditions

This paper presents an alternative frequency adaptive grid synchronization technique named HDN-FLL, which can accurately extract the fundamental positive- and negative-sequence components and interested harmonics in adverse three-phase grid voltage. The HDN-FLL is based on the harmonic decoupling network (HDN) consisting of multiple first order complex vector filters (FOCVF) with a frequency-locked loop (FLL), which makes the system frequency adaptive. The stability of the proposed FLL is strictly verified to be global asymptotically stable. In addition, the linearization and parameters tuning of the FLL is also discussed. The structure of the HDN has been widely used as a prefilter in grid synchronization techniques. However, the stability of the general HDN is seldom discussed. In this paper, the transfer function expression of the general HDN is deduced and its stability is verified by the root locus method. To show the advantages of the HDN-FLL, a simulation comparison with other gird synchronization methods is carried out. Experimental results verify the excellent performance of the proposed synchronization method.

[1]  Egon Ortjohann,et al.  Control Strategy for Three-/Four-Wire-Inverter-Based Distributed Generation , 2012, IEEE Transactions on Industrial Electronics.

[2]  R. Teodorescu,et al.  Overview of recent grid codes for wind power integration , 2010, 2010 12th International Conference on Optimization of Electrical and Electronic Equipment.

[3]  Stavros A. Papathanassiou,et al.  A review of grid code technical requirements for wind farms , 2009 .

[4]  Xiaoqiang Guo,et al.  Simple synchronisation technique for three-phase grid-connected distributed generation systems , 2013 .

[5]  Yun Wei Li,et al.  Grid synchronization PLL based on cascaded delayed signal cancellation , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

[6]  Yun Wei Li,et al.  A Flexible Harmonic Control Approach Through Voltage-Controlled DG–Grid Interfacing Converters , 2012, IEEE Transactions on Industrial Electronics.

[7]  M.R. Iravani,et al.  A method for synchronization of power electronic converters in polluted and variable-frequency environments , 2004, IEEE Transactions on Power Systems.

[8]  Zhe Chen,et al.  Multiple-Complex Coefficient-Filter-Based Phase-Locked Loop and Synchronization Technique for Three-Phase Grid-Interfaced Converters in Distributed Utility Networks , 2011, IEEE Transactions on Industrial Electronics.

[9]  Tae-Jin Kim,et al.  Phase-locked loop algorithm using FFT concept for grid synchronization under unbalanced voltage sags , 2013, 2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).

[10]  D. Boroyevich,et al.  Decoupled Double Synchronous Reference Frame PLL for Power Converters Control , 2007, IEEE Transactions on Power Electronics.

[11]  F. Blaabjerg,et al.  Grid synchronization of power converters using multiple second order generalized integrators , 2008, 2008 34th Annual Conference of IEEE Industrial Electronics.

[12]  H. Stemmler,et al.  Stationary frame generalized integrators for current control of active power filters with zero steady state error for current harmonics of concern under unbalanced and distorted operation conditions , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[13]  Remus Teodorescu,et al.  A New Single-Phase PLL Structure Based on Second Order Generalized Integrator , 2006 .

[14]  Xinbo Ruan,et al.  Grid Synchronization Systems of Three-Phase Grid-Connected Power Converters: A Complex-Vector-Filter Perspective , 2014, IEEE Transactions on Industrial Electronics.

[15]  Alireza Kahrobaeian,et al.  Networked-Based Hybrid Distributed Power Sharing and Control for Islanded Microgrid Systems , 2015, IEEE Transactions on Power Electronics.

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

[17]  O. Anaya-Lara,et al.  Control of DFIG-based wind generation for power network support , 2005, IEEE Transactions on Power Systems.

[18]  Xiong Du,et al.  Three-phase grid voltage synchronization using sinusoidal amplitude integrator in synchronous reference frame , 2015 .

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

[20]  Marco Liserre,et al.  New Positive-sequence Voltage Detector for Grid Synchronization of Power Converters under Faulty Grid Conditions , 2006 .

[21]  Hee-Je Kim,et al.  A Novel Grid Synchronization PLL Method Based on Adaptive Low-Pass Notch Filter for Grid-Connected PCS , 2014, IEEE Transactions on Industrial Electronics.

[22]  F. Blaabjerg,et al.  Advanced Grid Synchronization System for Power Converters under Unbalanced and Distorted Operating Conditions , 2006, IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics.

[23]  G. Joos,et al.  A Nonlinear Adaptive Synchronization Techniquefor Grid-Connected Distributed Energy Sources , 2008, IEEE Transactions on Power Electronics.

[24]  Frede Blaabjerg,et al.  Multiresonant Frequency-Locked Loop for Grid Synchronization of Power Converters Under Distorted Grid Conditions , 2011, IEEE Transactions on Industrial Electronics.