A Novel Phase Locked Loop for Grid-Connected Converters under Non-Ideal Grid Conditions

Grid synchronization is one of the key techniques for the grid-connected power converters used in distributed power generation systems. In order to achieve fast and accurate grid synchronization, a new phase locked loop (PLL) is proposed on the basis of the complex filter matrixes (CFM) orthogonal signal generator (OSG) crossing-decoupling method. By combining first-order complex filters with relation matrixes of positive and negative sequence voltage components, the OSG is designed to extract specific frequency orthogonal signals. Then, the OSG mathematical model is built in the frequency-domain and time-domain to analyze the spectral characteristics. Moreover, a crossing-decoupling method is suggested to decouple the fundamental voltage. From the eigenvalue analysis point of view, the stability and dynamic performance of the new PLL method is evaluated. Meanwhile, the digital implementation method is also provided. Finally, the effectiveness of the proposed method is verified by experiments under unbalanced and distorted grid voltage conditions.

[1]  Josep M. Guerrero,et al.  Dynamics Assessment of Advanced Single-Phase PLL Structures , 2013, IEEE Transactions on Industrial Electronics.

[2]  A. G. Yepes,et al.  Three-Phase PLLs With Fast Postfault Retracking and Steady-State Rejection of Voltage Unbalance and Harmonics by Means of Lead Compensation , 2011, IEEE Transactions on Power Electronics.

[3]  Saad Mekhilef,et al.  Stability and Performance Investigations of Model Predictive Controlled Active-Front-End (AFE) Rectifiers for Energy Storage Systems , 2015 .

[4]  R. Teodorescu,et al.  A Stationary Reference Frame Grid Synchronization System for Three-Phase Grid-Connected Power Converters Under Adverse Grid Conditions , 2012, IEEE Transactions on Power Electronics.

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

[6]  John P. Costas,et al.  Synchronous Communications , 1956, Proceedings of the IRE.

[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]  J. Doval-Gandoy,et al.  Tuning of Phase-Locked Loops for Power Converters Under Distorted Utility Conditions , 2009, IEEE Transactions on Industry Applications.

[9]  Aurobinda Routray,et al.  A novel Kalman filter for frequency estimation of distorted signals in power systems , 2002, IEEE Trans. Instrum. Meas..

[10]  Francisco A. S. Neves,et al.  A Method for Extracting the Fundamental-Frequency Positive-Sequence Voltage Vector Based on Simple Mathematical Transformations , 2008, IEEE Transactions on Industrial Electronics.

[11]  S.K. Mazumder,et al.  Solid-oxide-fuel-cell performance and durability: resolution of the effects of power-conditioning systems and application loads , 2004, IEEE Transactions on Power Electronics.

[12]  B.P. McGrath,et al.  Power converter line synchronization using a discrete Fourier transform (DFT) based on a variable sample rate , 2005, IEEE Transactions on Power Electronics.

[13]  Jon Are Suul,et al.  Voltage-Sensor-Less Synchronization to Unbalanced Grids by Frequency-Adaptive Virtual Flux Estimation , 2012, IEEE Transactions on Industrial Electronics.

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

[15]  Se-Kyo Chung,et al.  A phase tracking system for three phase utility interface inverters , 2000 .

[16]  Richard S. Zhang,et al.  A grid simulator with control of single-phase power converters in D-Q rotating frame , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

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

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

[19]  Seppo J. Ovaska,et al.  Adaptive filtering using multiplicative general parameters for zero-crossing detection , 2003, IEEE Trans. Ind. Electron..

[20]  Davood Yazdani,et al.  A Three-Phase Adaptive Notch Filter-Based Approach to Harmonic/Reactive Current Extraction and Harmonic Decomposition , 2010, IEEE Transactions on Power Electronics.

[21]  Leonardo A. B. Tôrres,et al.  Comparison of Three Single-Phase PLL Algorithms for UPS Applications , 2008, IEEE Transactions on Industrial Electronics.

[22]  Ziwen Yao,et al.  Fundamental phasor calculation with short delay , 2008, 2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century.

[23]  I.Y.H. Gu,et al.  Positive and negative sequence estimation for unbalanced voltage dips , 2003, 2003 IEEE Power Engineering Society General Meeting (IEEE Cat. No.03CH37491).

[24]  Marcelo A. Pérez,et al.  A Robust Phase-Locked Loop Algorithm to Synchronize Static-Power Converters With Polluted AC Systems , 2008, IEEE Transactions on Industrial Electronics.

[25]  G. Joos,et al.  A Fast and Accurate Synchronization Technique for Extraction of Symmetrical Components , 2009, IEEE Transactions on Power Electronics.

[26]  J. Van den Keybus,et al.  Design and Operation of a Phase-Locked Loop with Kalman Estimator-Based Filter for Single-Phase Applications , 2006, IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics.

[27]  J. Svensson,et al.  Practical Implementation of Delayed Signal Cancellation Method for Phase-Sequence Separation , 2007, IEEE Transactions on Power Delivery.

[28]  Loi Lei Lai,et al.  Real-time frequency and harmonic evaluation using artificial neural networks , 1999 .

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

[30]  M. Bongiorno,et al.  Effect of Sampling Frequency and Harmonics on Delay-Based Phase-Sequence Estimation Method , 2008, IEEE Transactions on Power Delivery.

[31]  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.

[32]  Seppo J. Ovaska,et al.  Noise reduction in zero crossing detection by predictive digital filtering , 1995, IEEE Trans. Ind. Electron..

[33]  K. Nam,et al.  Very fast phase angle estimation algorithm for a single-phase system having sudden phase angle jumps , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[34]  Jong-Woo Choi,et al.  Digital PLL control for single-phase photovoltaic system , 2004 .

[35]  Rizwan Bashirullah,et al.  A Delay Locked Loop Synchronization Scheme for High Frequency Multiphase Hysteretic DC-DC Converters , 2007, 2007 IEEE Symposium on VLSI Circuits.

[36]  Douglas L. Jones,et al.  Instantaneous frequency estimation using an adaptive short-time Fourier transform , 1995, Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers.