Low-Cost Voltage Zero-Crossing Detector for AC-Grid Applications

Abstract Renewable energy sources and energy storage devices are becoming more popular. Some of them like small hydropower turbines, wind turbines and diesel generators produce AC voltage with different frequency and voltage than the main grid. For them power electronics converters are necessary. Power electronics converters presented in industry use two or three level energy conversion, although direct AC to AC converters exist, but one of the main problems is the switch commutation when current or voltage is crossing the zero point. Zero crossing sensors are used to solve this problem. They consist of current or voltage measurement unit and zero crossing detector. Different approaches are used for zero crossing: hardware or software. Hardware approach is simple but it has low precision. Software approach has high precision but it is complicated and expensive. In this paper a simple low cost high precision approach is presented. It takes all advantages from both approaches. While tested with two types of microcontrollers the precision of experimental measurement is 25 μs - 40 μs.

[1]  Luis García de Vicuña,et al.  Fast grid synchronization technique based on a multiple cascaded general integrator scheme for distributed generation inverters , 2012, 2012 IEEE International Symposium on Industrial Electronics.

[2]  Luca Zarri,et al.  Matrix converter modulation strategies: a new general approach based on space-vector representation of the switch state , 2002, IEEE Trans. Ind. Electron..

[3]  Ilya Galkin,et al.  Selection of power factor corrector for modular uninterruptable power supply system , 2010, Proceedings of 14th International Power Electronics and Motion Control Conference EPE-PEMC 2010.

[4]  Jeong-Hoon Lee,et al.  Grid synchronization PLL robust to frequency variation, unbalanced and distorted voltage , 2011, 2011 IEEE Energy Conversion Congress and Exposition.

[5]  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.

[6]  R. Wall.  Simple methods for detecting zero crossing , 2003, IECON'03. 29th Annual Conference of the IEEE Industrial Electronics Society (IEEE Cat. No.03CH37468).

[7]  Wilfried Hofmann,et al.  Semi natural two steps commutation strategy for matrix converters , 1998, PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).

[8]  Lee Empringham,et al.  Intelligent commutation of matrix converter bi-directional switch cells using novel gate drive techniques , 1998, PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).

[9]  Jong Hyun Kim,et al.  Novel commutation technique of AC-AC converters , 1998 .

[10]  D. B. Ramos,et al.  Aspects of the integration of alternative sources of energy for application in distributed generation systems , 2011, XI Brazilian Power Electronics Conference.

[11]  José R. Rodríguez,et al.  Matrix converters: a technology review , 2002, IEEE Trans. Ind. Electron..

[12]  Patrick Wheeler,et al.  Optimised input filter design and low-loss switching techniques for a practical matrix converter , 1997 .

[13]  D.G. Holmes,et al.  Improved power converter line synchronisation using an adaptive Discrete Fourier Transform (DFT) , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[14]  S. Ovaska,et al.  Digital filtering for robust 50/60 Hz zero crossing detectors , 1995, Proceedings of 1995 IEEE Instrumentation and Measurement Technology Conference - IMTC '95.

[15]  I. Carugati,et al.  Frequency Adaptive PLL for Polluted Single-Phase Grids , 2012, IEEE Transactions on Power Electronics.

[16]  Caisheng Wang,et al.  Alternative Energy Distributed Generation: Need for Multi-Source Operation , 2006, 2006 38th North American Power Symposium.

[17]  Seppo J. Ovaska,et al.  Adaptive lowpass filters for zero-crossing detectors , 2002, IEEE 2002 28th Annual Conference of the Industrial Electronics Society. IECON 02.

[18]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[19]  S. Valiviita.  Neural network for zero-crossing detection of distorted line voltages in weak AC-systems , 1998, IMTC/98 Conference Proceedings. IEEE Instrumentation and Measurement Technology Conference. Where Instrumentation is Going (Cat. No.98CH36222).

[20]  Ilhami Colak,et al.  Design and application of a novel zero-crossing detector circuit , 2011, 2011 International Conference on Power Engineering, Energy and Electrical Drives.

[21]  H. Farhangi,et al.  The path of the smart grid , 2010, IEEE Power and Energy Magazine.