A high performance PLL for polluted utility grid based on cascade adaptive notch filters

A high performance Phase-Locked Loop (PLL) based on cascade adaptive notch filters (ANF) is proposed for polluted utility grid in this paper. The proposed cascade structure can regenerate a new signal similar to the fundamental component of the original grid voltage sample signal with the same amplitude and no phase shift. Compared to traditional PLL, The proposed PLL is more accurate especially when the grid voltage contains harmonics. The static behavior of noise rejection and harmonics rejection is verified by simulations and experiments. The dynamic performance of step frequency tracking is also evaluated. Simulations and experiments show that the proposed PLL not only has small static errors but also has a quick dynamic response.

[1]  M.R. Iravani,et al.  Estimation of frequency and its rate of change for applications in power systems , 2004, IEEE Transactions on Power Delivery.

[2]  Enrique Acha,et al.  Tunning of Phase Locked Loops for Power Converters under Distorted Utility Conditions , 2009, 2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition.

[3]  Alireza R. Bakhshai,et al.  Stability analysis of periodic orbit of an adaptive notch filter for frequency estimation of a periodic signal , 2007, Autom..

[4]  E.A.A. Coelho,et al.  PLL Structures for Utility Connected Systems under Distorted Utility Conditions , 2006, IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics.

[5]  Davood Yazdani,et al.  Robust Adaptive Frequency Estimation of Three-Phase Power Systems , 2010, IEEE Transactions on Instrumentation and Measurement.

[6]  P.S. Sensarma,et al.  Improved PLL Under Distorted Utility Conditions , 2006, 2006 IEEE International Conference on Industrial Technology.

[7]  Mauricio Aredes,et al.  Analysis and Software Implementation of a Robust Synchronizing PLL Circuit Based on the pq Theory , 2006, IEEE Transactions on Industrial Electronics.

[8]  Alireza R. Bakhshai,et al.  An adaptive notch filter for frequency estimation of a periodic signal , 2004, IEEE Transactions on Automatic Control.

[9]  Davood Yazdani,et al.  A Real-Time Three-Phase Selective-Harmonic-Extraction Approach for Grid-Connected Converters , 2009, IEEE Transactions on Industrial Electronics.

[10]  Romeo Ortega,et al.  A globally convergent frequency estimator , 1999, IEEE Trans. Autom. Control..

[11]  M. Karimi-Ghartemani,et al.  Estimation of Power System Frequency Using an Adaptive Notch Filter , 2007, IEEE Transactions on Instrumentation and Measurement.

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