Stator voltage harmonics and unbalance compensation of the sensorless standalone doubly fed induction generator

Purpose – Doubly fed induction generator (DFIG) is widely used in wind energy conversion systems and it can operate with other primary movers. The purpose of this paper is to focus on the standalone operation of DFIG which may expand the area of possible applications and increase capabilities of the generation system in terms of power quality. Design/methodology/approach – Synthesis of the control method was preceded by analysis of mathematical model of the machine. The control method based on the negative sequence and high harmonics extraction has been developed and verified in the laboratory unit. Control of the fundamental frequency component uses neither rotor speed nor position sensors. Findings – The original method allows to compensate negative sequence and high harmonics of the generated voltage. At the same time, due to the active filtering capability of the grid side converter, the stator phase current shape is close to sine wave. Thus, it is seen by the machine as a linear load, what eliminates...

[1]  W. Koczara,et al.  Sensorless stand alone variable speed system for distributed generation , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[2]  J. M. Kauffmann,et al.  Double-fed induction machine: converter optimisation and field oriented control without position sensor , 1998 .

[3]  J. López,et al.  Wind Turbines Based on Doubly Fed Induction Generator Under Asymmetrical Voltage Dips , 2008, IEEE Transactions on Energy Conversion.

[4]  D. F. Howard,et al.  Feedforward Transient Compensation Control for DFIG Wind Turbines During Both Balanced and Unbalanced Grid Disturbances , 2013, IEEE Transactions on Industry Applications.

[5]  S. Arnalte,et al.  Direct Power Control Applied to Doubly Fed Induction Generator Under Unbalanced Grid Voltage Conditions , 2008, IEEE Transactions on Power Electronics.

[6]  Kashem M. Muttaqi,et al.  Active power management of a super capacitor-battery hybrid energy storage system for standalone operation of DFIG based wind turbines , 2012, 2012 IEEE Industry Applications Society Annual Meeting.

[7]  W. Koczara,et al.  Power management in an autonomous adjustable speed large power diesel gensets , 2008, 2008 13th International Power Electronics and Motion Control Conference.

[8]  David G. Dorrell,et al.  Design and Analysis of Brushless Doubly Fed Reluctance Machines , 2013 .

[9]  G. D. Marques,et al.  Air-Gap-Power-Vector-Based Sensorless Method for DFIG Control Without Flux Estimator , 2011, IEEE Transactions on Industrial Electronics.

[10]  Barry W. Williams,et al.  Improved Control of DFIG Systems During Network Unbalance Using PI–R Current Regulators , 2009, IEEE Transactions on Industrial Electronics.

[11]  Hirofumi Akagi,et al.  Control and performance of a doubly-fed induction machine intended for a flywheel energy storage system , 2002 .

[12]  Amit Jain,et al.  Diesel Engine Driven Stand-Alone Variable SpeedConstant Frequency Slip Ring Induction Generator -Theory and Experimental Results , 2010 .

[13]  Wlodzimierz Koczara,et al.  Autonomous power system for island or grid-connected wind turbines in distributed generation , 2008 .

[14]  J. Niiranen,et al.  Performance Study of a Doubly Fed Wind-Power Induction Generator Under Network Disturbances , 2006, IEEE Transactions on Energy Conversion.

[15]  Roberto Cárdenas,et al.  Sensorless Control of Doubly-Fed Induction Generators Using a Rotor-Current-Based MRAS Observer , 2008, IEEE Transactions on Industrial Electronics.

[16]  R. Datta,et al.  Direct power control of grid-connected wound rotor induction machine without rotor position sensors , 2001 .