A Novel Grid Synchronization Method Based on Hybrid Filter Under Distorted Voltage Conditions

The phase-locked accuracy of conventional phase-locked method is reduced when the grid voltage contains fundamental frequency negative sequence(FFNS) component, harmonic component, and DC offset component. Aiming at this problem, a novel adaptive notch filter (NANF) is proposed, and a dual NANF (DNANF) structure is designed to eliminate the FFNS component and extract the fundamental frequency positive sequence(FFPS) component based on NANF. Furthermore, dcDNANF with DC offset rejection capability is proposed by adopting DNANF. Then a novel hybrid filter in dq-frame is designed by combining dcDNANF and the cascaded delay signal cancellation operator filter whose delay parameters are 4 and 24 in dq-frame (dqCDSC4,24). Meanwhile, a new SRF-PLL design method is proposed based on the novel hybrid filter. This proposed method employs dqCDSC4,24 to separate the positive and negative sequences of the voltage and eliminate the high frequency harmonics in the grid voltage, and uses dcDNANF to reject the DC offset, so as to achieve the accurate acquisition of the fundamental voltage information under distortion and unbalanced grid. Simulation and experimental results show that compared with the conventional SRF-PLL methods, the proposed method can obtain faster phase tracking speed, better phase-locked effect, faster dynamic response, and better stability.

[1]  Milos Doroslovacki,et al.  Adaptive cascaded Delayed Signal Cancellation PLL for three-phase grid under unbalanced and distorted condition , 2020 .

[2]  Hany A. Hamed,et al.  Frequency Adaptive CDSC-PLL Using Axis Drift Control Under Adverse Grid Condition , 2017, IEEE Transactions on Industrial Electronics.

[3]  Abhijit Kulkarni,et al.  Design of synchronous reference frame phase-locked loop with the presence of dc offsets in the input voltage , 2015 .

[4]  Hany A. Hamed,et al.  A New Type-2 PLL Based on Unit Delay Phase Angle Error Compensation During the Frequency Ramp , 2019, IEEE Transactions on Power Systems.

[5]  Lei Guo,et al.  An Amplitude Adaptive Notch Filter for Grid Signal Processing , 2013, IEEE Transactions on Power Electronics.

[6]  Kamel Kara,et al.  Enhanced structure of second-order generalized integrator frequency-locked loop suitable for DC-offset rejection in single-phase systems , 2019 .

[7]  Yao Sun,et al.  Stability analysis and concept extension of harmonic decoupling network for the three-phase grid synchronization systems , 2017 .

[8]  Juan C. Vasquez,et al.  An Adaptive Least-Error Squares Filter-Based Phase-Locked Loop for Synchronization and Signal Decomposition Purposes , 2017, IEEE Transactions on Industrial Electronics.

[9]  Ikram Ullah,et al.  Comparison of Synchronization Techniques Under Distorted Grid Conditions , 2019, IEEE Access.

[10]  Josep M. Guerrero,et al.  dq-Frame Cascaded Delayed Signal Cancellation- Based PLL: Analysis, Design, and Comparison With Moving Average Filter-Based PLL , 2015, IEEE Transactions on Power Electronics.

[11]  Gabriel Garcerá,et al.  An Adaptive Synchronous-Reference-Frame Phase-Locked Loop for Power Quality Improvement in a Polluted Utility Grid , 2012, IEEE Transactions on Industrial Electronics.

[12]  Mohamed Haouari,et al.  Review of optimization techniques applied for the integration of distributed generation from renewable energy sources , 2017 .

[13]  Josep M. Guerrero,et al.  Five Approaches to Deal With Problem of DC Offset in Phase-Locked Loop Algorithms: Design Considerations and Performance Evaluations , 2016, IEEE Transactions on Power Electronics.

[14]  Yunlu Li,et al.  A Hybrid Filtering Technique-Based PLL Targeting Fast and Robust Tracking Performance under Distorted Grid Conditions , 2018 .

[15]  Qiuye Sun,et al.  An Adaptive Frequency Phase-Locked Loop Based on a Third Order Generalized Integrator , 2019 .

[16]  Mohammad Karimadini,et al.  PLL with frequency and initial-phase-angle detectors: performance analysis and speed/robustness trade-off improvement , 2019 .

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

[18]  Jonathan W. Kimball,et al.  Modeling and Tuning of an Improved Delayed-Signal-Cancellation PLL for Microgrid Application , 2019, IEEE Transactions on Energy Conversion.

[19]  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.

[20]  Claus Leth Bak,et al.  Analysis and design of notch filter-based PLLs for grid-connected applications , 2017 .

[21]  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.

[22]  Yunlu Li,et al.  Performance Improvement of Quasi-Type-1 PLL by using a Complex Notch Filter , 2016, IEEE Access.

[23]  Elias Kyriakides,et al.  Design of an advanced PLL for accurate phase angle extraction under grid voltage HIHs and DC offset , 2018 .

[24]  Vassilios G. Agelidis,et al.  Three-Phase PLL for Grid-Connected Power Converters Under Both Amplitude and Phase Unbalanced Conditions , 2019, IEEE Transactions on Industrial Electronics.

[25]  Vinod John,et al.  Design of a fast response time single-phase PLL with DC offset rejection capability , 2016, 2016 IEEE Applied Power Electronics Conference and Exposition (APEC).

[26]  Yu Wang,et al.  Analysis of frequency characteristics of phase-locked loops and effects on stability of three-phase grid-connected inverter , 2019 .

[27]  Zhe Zhang,et al.  A Grid Synchronization PLL Method Based on Mixed Second- and Third-Order Generalized Integrator for DC Offset Elimination and Frequency Adaptability , 2018, IEEE Journal of Emerging and Selected Topics in Power Electronics.

[28]  Lion Hirth,et al.  Balancing power and variable renewables: Three links , 2015 .

[29]  Elias Kyriakides,et al.  A new MAF based αβEPMAFPLL for grid connected RES with improved performance under grid faults , 2018 .

[30]  Mohamed Shawky El Moursi,et al.  Adaptive Low-Pass Filter Based DC Offset Removal Technique for Three-Phase PLLs , 2018, IEEE Transactions on Industrial Electronics.

[31]  Yong Yang,et al.  A method to improve the transient response of dq-frame cascaded delayed-signal-cancellation PLL , 2018 .

[32]  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.

[33]  Hongbin Pan,et al.  A Novel Phase-Locked Loop With Improved-Dual Adaptive Notch Filter and Multi-Variable Filter , 2019, IEEE Access.

[34]  Geng Yang,et al.  A Generalized Design Framework of Notch Filter Based Frequency-Locked Loop for Three-Phase Grid Voltage , 2018, IEEE Transactions on Industrial Electronics.

[35]  Josep M. Guerrero,et al.  A Systematic Approach to Design High-Order Phase-Locked Loops , 2015, IEEE Transactions on Power Electronics.

[36]  Ahmed M. A. Haidar,et al.  A comprehensive review of synchronization methods for grid-connected converters of renewable energy source , 2016 .

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

[38]  Josep M. Guerrero,et al.  An Efficient Implementation of Generalized Delayed Signal Cancellation PLL , 2016, IEEE Transactions on Power Electronics.