Frequency Locked Loop for grid-connected VSI synchronization and power analysis

Future power systems will include the massive utilization of distributed generation mainly based on renewable energy resources. These renewable energy resources can be interconnected to the utility grid by means of power electronics converters working as Voltage Source Inverters (VSIs) which must be synchronized with the utility voltage. Synchronization methods are mandatory to make possible a correct power control and to keep an acceptable power quality. The Field Programmable Gate Array (FPGA) has been introduced in recent years as a promising target device for embedded applications especially when the parallel implementation of multiple algorithms is needed. This paper presents a new structure of the Adaptive Linear Neuron (ADALINE) with Frequency Locked Loop (ADALINE-FLL), its FPGA implementation and its experimental evaluation. The proposition has been implemented in a Xilinx FPGA device and experimentally validated using low power VSI connected to a low voltage utility.

[1]  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.

[2]  M. Liserre,et al.  Independent synchronization and control of three phase grid converters , 2006, International Symposium on Power Electronics, Electrical Drives, Automation and Motion, 2006. SPEEDAM 2006..

[3]  S.-K. Chung,et al.  Phase-locked loop for grid-connected three-phase power conversion systems , 2000 .

[4]  M. Liserre,et al.  A Comparative Analysis of Real-Time Algorithms for Power Signal Decomposition in Multiple Synchronous Reference Frames , 2007, IEEE Transactions on Power Electronics.

[5]  Giuseppe Fedele,et al.  A Power Electrical Signal Tracking Strategy Based on the Modulating Functions Method , 2009, IEEE Transactions on Industrial Electronics.

[6]  Y. Hu,et al.  A new frequency tracking and phasor estimation algorithm for generator protection , 1997 .

[7]  Kodjo Agbossou,et al.  FPGA implementation of fixed and variable frequency ADALINE schemes for grid-connected VSI synchronization , 2011, 2011 IEEE International Symposium on Industrial Electronics.

[8]  Y. Kang,et al.  Fourier Transform-Based Modified Phasor Estimation Method Immune to the Effect of the DC Offsets , 2009, IEEE Transactions on Power Delivery.

[9]  V.G. Agelidis,et al.  Offset rejection for PLL based synchronization in grid-connected converters , 2008, 2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition.

[10]  Stephen J. Finney,et al.  Three-phase phase-lock loop for distorted utilities , 2007 .

[11]  K. Agbossou,et al.  Development of a FPGA Based Real-Time Power Analysis and Control for Distributed Generation Interface , 2012, IEEE Transactions on Power Systems.

[12]  M.R. Iravani,et al.  Measurement of harmonics/inter-harmonics of time-varying frequencies , 2005, IEEE Transactions on Power Delivery.

[13]  Shinji Shinnaka,et al.  A Robust Single-Phase PLL System With Stable and Fast Tracking , 2008, IEEE Transactions on Industry Applications.

[14]  V. Blasko,et al.  Operation of a phase locked loop system under distorted utility conditions , 1997 .

[15]  Houshang Karimi,et al.  A magnitude/phase-locked loop system based on estimation of frequency and in-phase/quadrature-phase amplitudes , 2004, IEEE Transactions on Industrial Electronics.

[16]  Ramin Agha Zadeh,et al.  Combination of Kalman Filter and Least-Error Square Techniques in Power System , 2010, IEEE Transactions on Power Delivery.

[17]  Gary W. Chang,et al.  A two-stage ADALINE for harmonics and interharmonics measurement , 2010, 2010 5th IEEE Conference on Industrial Electronics and Applications.

[18]  Chien-Hung Huang,et al.  Frequency Estimation of Distorted Power System Signals Using a Robust Algorithm , 2008, IEEE Transactions on Power Delivery.

[19]  Ganapati Panda,et al.  Frequency estimation of distorted power system signals using extended complex Kalman filter , 1999 .

[20]  Kodjo Agbossou,et al.  Real-time evaluation of power quality using FPGA based measurement system , 2010, 2010 IEEE International Symposium on Industrial Electronics.

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

[22]  J Pou,et al.  Variable-Frequency Grid-Sequence Detector Based on a Quasi-Ideal Low-Pass Filter Stage and a Phase-Locked Loop , 2010, IEEE Transactions on Power Electronics.

[23]  Mark Sumner,et al.  Real-Time Estimation of Fundamental Frequency and Harmonics for Active Shunt Power Filters in Aircraft Electrical Systems , 2009, IEEE Transactions on Industrial Electronics.

[24]  Bin Wu,et al.  Direct PWM Synchronization Using An All Digital Phase-Locked Loop for High Power Grid-Interfacing Converters , 2007, APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition.

[25]  Shahin Hedayati Kia,et al.  A High-Resolution Frequency Estimation Method for Three-Phase Induction Machine Fault Detection , 2007, IEEE Transactions on Industrial Electronics.

[26]  T. Chang,et al.  Iterative Frequency Estimation Based on MVDR Spectrum , 2010, IEEE Transactions on Power Delivery.