Self-Tuned Feed-Forward Compensation for Harmonic Reduction in Single-Phase Low-Voltage Inverters

A new self-tuned feed-forward control strategy for low-voltage single-phase inverters to reduce the harmonic distortion in the output voltage is proposed. A discrete composite observer enables separate and independent control of the fundamental and harmonic components of the distorted inverter voltage and load current. The observer also facilitates the application of single-phase dq transformation by providing the fundamental in-phase and quadrature signals. In addition, the extracted voltage and load current harmonics from the observer are used for online identification of the series inductance and the equivalent resistance of the LC filter. While the feed-forward compensation is made self-tuned, the leftover harmonic distortion is reduced by small harmonic feedback. Simulation and experimental realization with Cyclone II field-programmable gate array have been carried out.

[1]  Y. Ito,et al.  Microprocessor based robust digital control for UPS with three-phase PWM inverter , 1995 .

[2]  K. Narendra,et al.  An identification procedure for discrete multivariable systems , 1974 .

[3]  Paolo Mattavelli,et al.  An improved deadbeat control for UPS using disturbance observers , 2005, IEEE Transactions on Industrial Electronics.

[4]  F. Botteron,et al.  A Three-Phase UPS That Complies With the Standard IEC 62040-3 , 2007, IEEE Transactions on Industrial Electronics.

[5]  R.W. De Doncker,et al.  Control of three phase power supplies for ultra low THD , 1991, [Proceedings] APEC '91: Sixth Annual Applied Power Electronics Conference and Exhibition.

[6]  Robert D. Lorenz,et al.  A synchronous-frame controller for a single-phase sine wave inverter , 1997, Proceedings of APEC 97 - Applied Power Electronics Conference.

[7]  Paolo Mattavelli,et al.  An Adaptive Control for UPS to Compensate Unbalance and Harmonic Distortion Using a Combined Capacitor/Load Current Sensing , 2007, IEEE Transactions on Industrial Electronics.

[8]  K. Selvajyothi,et al.  Implementation of a control strategy for elimination of voltage harmonics in inverters , 2008, 2008 51st Midwest Symposium on Circuits and Systems.

[9]  Robert D. Lorenz,et al.  Control topology options for single-phase UPS inverters , 1996, Proceedings of International Conference on Power Electronics, Drives and Energy Systems for Industrial Growth.

[10]  K. Selvajyothi,et al.  Extraction of Harmonics Using Composite Observers , 2008, IEEE Transactions on Power Delivery.

[11]  Marian P. Kazmierkowski,et al.  Current control techniques for three-phase voltage-source PWM converters: a survey , 1998, IEEE Trans. Ind. Electron..

[12]  Robert D. Lorenz,et al.  Control topology options for single-phase UPS inverters , 1997 .

[13]  Ehab F. El-Saadany,et al.  An Improved Deadbeat Current Control Scheme With a Novel Adaptive Self-Tuning Load Model for a Three-Phase PWM Voltage-Source Inverter , 2007, IEEE Transactions on Industrial Electronics.

[14]  Daniel Coutinho,et al.  Multiple-Loop H-Infinity Control Design for Uninterruptible Power Supplies , 2007, IEEE Transactions on Industrial Electronics.

[15]  J. Salaet,et al.  Comparison between two methods of DQ transformation for single phase converters control. Application to a 3-level boost rectifier , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[16]  John E. Quaicoe,et al.  Analysis and design of a multiple feedback loop control strategy for single-phase voltage-source UPS inverters , 1996 .

[17]  Dipti Srinivasan,et al.  A Simple Control Method for High-Performance UPS Inverters Through Output-Impedance Reduction , 2008, IEEE Transactions on Industrial Electronics.

[18]  Donald Grahame Holmes,et al.  Stationary frame current regulation of PWM inverters with zero steady state error , 1999, 30th Annual IEEE Power Electronics Specialists Conference. Record. (Cat. No.99CH36321).

[19]  Frede Blaabjerg,et al.  An Ideal PWM-VSI Inverter with Feedforward and Feedback Compensation , 1993 .

[20]  Leopoldo García Franquelo,et al.  Model Predictive Control of an Inverter With Output $LC$ Filter for UPS Applications , 2009, IEEE Transactions on Industrial Electronics.

[21]  Matthew C. Trigg,et al.  DC Bus Compensation for a Sinusoidal Voltage Source Inverter with Wave-Shaping Control , 2006, IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics.

[22]  Paolo Mattavelli,et al.  Repetitive-Based Controller for a UPS Inverter to Compensate Unbalance and Harmonic Distortion , 2007, IEEE Transactions on Industrial Electronics.

[23]  P. Enjeti,et al.  DSP control of high power UPS systems feeding nonlinear loads , 1995, Proceedings of 1995 American Control Conference - ACC'95.

[24]  Atsuo Kawamura,et al.  Instantaneous Feedback Controlled PWM Inverter with Adaptive Hysteresis , 1984, IEEE Transactions on Industry Applications.

[25]  K. Selvajyothi,et al.  Reduction of Voltage Harmonics in Single Phase Inverters Using Composite Observers , 2010, IEEE Transactions on Power Delivery.

[26]  Ping Wang,et al.  Single-Loop Digital Control of High-Power 400-Hz Ground Power Unit for Airplanes , 2010, IEEE Transactions on Industrial Electronics.

[27]  Richard S. Zhang,et al.  A grid simulator with control of single-phase power converters in D-Q rotating frame , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[28]  Seung-Yub Park,et al.  Compensation of Dead-Time Effects Based on Adaptive Harmonic Filtering in the Vector-Controlled AC Motor Drives , 2007, IEEE Transactions on Industrial Electronics.

[29]  Takao Kawabata,et al.  Dead beat control of three phase PWM inverter , 1987 .

[30]  J. Holtz,et al.  Sensorless vector control of induction motors at very low speed using a nonlinear inverter model and parameter identification , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[31]  Dushan Boroyevich,et al.  A D-Q Frame Controller for a Full-Bridge Single Phase Inverter Used in Small Distributed Power Generation Systems , 2007, APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition.