Modeling variable frequency drive and motor systems in power systems dynamic studies

Variable frequency drives (VFD) are widely used in industrial facilities, however, dynamic models for VFD-motor systems suitable for power system dynamic studies are not available. In this paper, a generic VFD-motor system modeling technique is proposed for the case that VFDs are able to ride through the fault. To illustrate the proposed technique, a dynamic model for a low voltage 6-pulse voltage source inverter (VSI) based drive and induction motor system with voltage per Hz control is created. To verify the accuracy of the developed dynamic model, a case study is conducted using a sample VFD-motor system, both derived dynamic model and detailed switching model for the same system are simulated using Matlab/Simulink, and their dynamic responses are compared. It is found that there are good agreements between the two models, and thus the accuracy of the developed dynamic model is verified. For the case that VFDs will trip out of lines, a VFD trip characteristic curve is proposed, and a simple screening procedure is recommended for evaluating whether the VFD-motor system shall remain in service or trip out of lines in power systems dynamic studies.

[1]  C. W. Taylor,et al.  Load representation for dynamic performance analysis , 1993 .

[2]  V.E. Wagner,et al.  Power quality and factory automation , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[3]  Scott D. Sudhoff,et al.  Analysis of Electric Machinery and Drive Systems , 1995 .

[4]  J.M. Van Coller,et al.  A test facility for determining the response of industrial equipment to voltage dips (sags) , 1999, IEEE International Electric Machines and Drives Conference. IEMDC'99. Proceedings (Cat. No.99EX272).

[5]  Babu Narayanan,et al.  POWER SYSTEM STABILITY AND CONTROL , 2015 .

[6]  T. Omata,et al.  Effects of series impedance on power system load dynamics , 1999 .

[7]  E. R. Collins,et al.  The effects of load types on the behavior of AC motor drives during voltage sags , 2002, 10th International Conference on Harmonics and Quality of Power. Proceedings (Cat. No.02EX630).

[8]  K. Srinivasan,et al.  Statistical analysis of load behavior parameters at four major loads , 1994, Proceedings of IEEE/PES Transmission and Distribution Conference.

[9]  Math Bollen,et al.  CIGRE/ CIRED/ UIE joint working group C4.110, voltage dip immunity of equipment in installations - Main contributions and conclusions , 2009 .

[10]  J.V. Milanovic,et al.  Sensitivity of AC adjustable speed drives to voltage sags and short interruptions , 2005, IEEE Transactions on Power Delivery.

[11]  E. Welfonder,et al.  New Transmission Planning Model , 1989, IEEE Power Engineering Review.

[12]  H. G. Sarmiento,et al.  A voltage sag study in an industry with adjustable speed drives , 1994, Proceedings of Industrial and Commercial Power Systems Conference.

[13]  D. C. Lee,et al.  Dynamic Load Models Derived from Date Acquired During System Transients , 1982, IEEE Transactions on Power Apparatus and Systems.

[14]  J.V. Milanovic,et al.  Probabilistic assessment of equipment trips due to voltage sags , 2006, IEEE Transactions on Power Delivery.

[15]  C. W. Taylor,et al.  Standard load models for power flow and dynamic performance simulation , 1995 .

[16]  Prasad Enjeti,et al.  Effect of voltage sags on adjustable-speed drives: a critical evaluation and an approach to improve performance , 1999 .

[17]  Bimal K. Bose,et al.  Investigation of fault modes of voltage-fed inverter system for induction motor drive , 1992, Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting.

[18]  Jovica V. Milanovic,et al.  Development of a dynamic power system load model , 2001 .

[19]  G. J. Rogers,et al.  An Aggregate Induction Motor Model for Industrial Plants , 1984, IEEE Transactions on Power Apparatus and Systems.

[20]  Sasa Z. Djokic,et al.  The influence of overcurrent and undervoltage protection settings on ASD sensitivity to voltage sags and short interruptions , 2008 .

[21]  Juri Jatskevich,et al.  Approximate dynamic average-value model for controlled line-commuted converters , 2011, 2011 24th Canadian Conference on Electrical and Computer Engineering(CCECE).

[22]  Chanan Singh,et al.  Component-based load modeling including capacitor banks , 2001, 2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262).

[23]  Math Bollen.  Comparing voltage dip survey results , 2002, 2002 IEEE Power Engineering Society Winter Meeting. Conference Proceedings (Cat. No.02CH37309).

[24]  Jon Clare,et al.  Doubly fed induction generator using back-to-back PWM converters and its application to variable-speed wind-energy generation , 1996 .

[25]  Frede Blaabjerg,et al.  Grid voltage sags effects on frequency converter drivers and controlled rectifier drivers , 2005 .

[26]  H. G. Sarmiento,et al.  A voltage sag study in an industry with adjustable speed drives , 1996 .