Adaptive Sampling Frequency Synchronized Reference Generator for Grid Connected Power Converters

This paper introduces a simplified method for digital generation of high-quality references required for control of single-phase grid-connected (GC) power converters, which can generate synchronized sinusoidal waveforms at the same frequency of the input signal or its harmonics. Therefore, its application can be useful for active power filtering, high power factor rectification, and grid integration of renewable energy sources. A hybrid analog-digital implementation is proposed integrating an Adaptive Sampling Frequency Moving Average Filter (ASF-MAF) and a discrete-time Proportional-Integral (PI) controller into a Digital Signal Processor (DSP) operating with a sampling frequency defined by an external hardware-based Voltage Controlled Oscillator (VCO). The main advantages attributed to the method are immunity to harmonic content, accuracy in computations despite of frequency changes, flexibility to produce phase displacements and reduced computational cost. Performance of the proposal was verified by means of simulation and experimental results.

[1]  J.A. Pecas Lopes,et al.  A comparative analysis and implementation of various PLL techniques applied to single-phase grids , 2011, Proceedings of the 2011 3rd International Youth Conference on Energetics (IYCE).

[2]  Josep M. Guerrero,et al.  Comparative Performance Evaluation of Orthogonal-Signal-Generators-Based Single-Phase PLL Algorithms—A Survey , 2016, IEEE Transactions on Power Electronics.

[3]  Frede Blaabjerg,et al.  A Synchronization Scheme for Single-Phase Grid-Tied Inverters Under Harmonic Distortion and Grid Disturbances , 2017, IEEE Transactions on Power Electronics.

[4]  S.M. Silva,et al.  Performance evaluation of PLL algorithms for single-phase grid-connected systems , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[5]  Germain Garcia,et al.  A simple digital sinusoidal reference generator for grid-synchronized power electronics applications , 2015, 2015 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA).

[6]  Guan-Chyun Hsieh,et al.  Phase-locked loop techniques. A survey , 1996, IEEE Trans. Ind. Electron..

[7]  Henrique M. G. Martins,et al.  From Mobile Computers to Mobile Information? A Case Study of Physicians' Mobile Information Use , 2011, 2011 IEEE International Conference on Communications (ICC).

[8]  Pan Shen,et al.  Comparative performance evaluation of phase-locked loop (PLL) algorithms for single-phase grid-connected converters , 2016, 2016 IEEE 8th International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia).

[9]  Feng Gao,et al.  A Method to Improve the Dynamic Performance of Moving Average Filter-Based PLL , 2015, IEEE Transactions on Power Electronics.

[10]  Qirong Jiang,et al.  A Novel Phase-Locked Loop Based on Frequency Detector and Initial Phase Angle Detector , 2013 .

[11]  H.G. Chiacchiarini,et al.  Synthesis of Sinusoidal Waveform References Synchronized With Periodic Signals , 2008, IEEE Transactions on Power Electronics.

[12]  Geng Yang,et al.  Fast and Robust Phase Estimation Algorithm for Heavily Distorted Grid Conditions , 2016, IEEE Transactions on Industrial Electronics.

[13]  Josep M. Guerrero,et al.  Moving Average Filter Based Phase-Locked Loops: Performance Analysis and Design Guidelines , 2014, IEEE Transactions on Power Electronics.

[14]  Oswaldo Lopez-Santos,et al.  Discrete Time Nested-Loop Controller for the Output Stage of a Photovoltaic Microinverter , 2016, WEA.

[15]  M. N. Cirstea,et al.  A modern ASIC controller for a 6-pulse rectifier , 1997, Proceedings. Tenth Annual IEEE International ASIC Conference and Exhibit (Cat. No.97TH8334).

[16]  Qi Zhang,et al.  Analysis and Design of a Digital Phase-Locked Loop for Single-Phase Grid-Connected Power Conversion Systems , 2011, IEEE Transactions on Industrial Electronics.

[17]  Juan C. Vasquez,et al.  A Nonadaptive Window-Based PLL for Single-Phase Applications , 2018, IEEE Transactions on Power Electronics.

[18]  Juan C. Vasquez,et al.  Single-Phase PLLs: A Review of Recent Advances , 2017, IEEE Transactions on Power Electronics.

[19]  M.M. Jovanovic,et al.  Review and Stability Analysis of PLL-Based Interleaving Control of DCM/CCM Boundary Boost PFC Converters , 2009, IEEE Transactions on Power Electronics.

[20]  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.

[21]  Oswaldo Lopez-Santos,et al.  Operation of a Photovoltaic Microinverter as Active Power Filter using the single phase P-Q Theory and Sliding Mode Control , 2017 .

[22]  Luis Martinez-Salamero,et al.  Non-linear control of the output stage of a solar microinverter , 2017, Int. J. Control.