Optimized Design of Stationary Frame Three Phase AC Current Regulators

Current regulation plays an important role in modern power electronic AC conversion systems. The most direct strategy to regulate such currents is to use a simple closed loop proportional-integral (PI) regulator, which has no theoretical stability limits as the proportional and integral gains are increased, since it is only a second order system. However, pulsewidth modulation (PWM) transport and controller sampling delays limit the gain values that can be achieved in practical systems. Taking these limitations into account, this paper presents an analytical method to determine the best possible gains that can be achieved for any class of practical linear AC current controller. The analysis shows that the maximum possible proportional gain is determined by the plant series inductance, the DC bus voltage and the transport and sampling delays, while the maximum possible integral gain is determined primarily by the transport and sampling delays. The work is applicable to stationary frame PI regulators, stationary frame controllers with back electromotive force compensation, stationary frame P+ resonant (PR) controllers, and synchronous d- q frame controllers, since they all have identical proportional and integral gains that must be optimized for any particular application.

[1]  Hiroshi Nagase,et al.  High-Performance Induction Motor Drive System Using a PWM Inverter , 1984, IEEE Transactions on Industry Applications.

[2]  Russel J. Kerkman,et al.  A New Synchronous Current Regulator and an Analysis of Current-Regulated PWM Inverters , 1986, IEEE Transactions on Industry Applications.

[3]  Robert D. Lorenz,et al.  Performance of Feedforward Current Regulators for Field-Oriented Induction Machine Controllers , 1987, IEEE Transactions on Industry Applications.

[4]  Paolo Tenti,et al.  A novel hysteresis control method for current-controlled voltage-source PWM inverters with constant modulation frequency , 1990 .

[5]  Donald Grahame Holmes,et al.  Implementation of a direct digital predictive current controller for single and three phase voltage source inverters , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

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

[7]  Donald Grahame Holmes,et al.  Frequency domain analysis of three phase linear current regulators , 1999 .

[8]  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).

[9]  Paolo Mattavelli,et al.  Implementation of synchronous frame harmonic control for high-performance AC power supplies , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[10]  Donald Grahame Holmes,et al.  Delta operator digital filters for high performance inverter applications , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[11]  Holmes,et al.  Pulse width modulation for power converters , 2003 .

[12]  P. Mattavelli,et al.  Dynamic improvement in UPS by means of control delay minimization , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[13]  H. Pinheiro,et al.  Comparison of Six Digital Current Control Techniques for Three-Phase Voltage-Fed PWM Converters Connected to the Utility Grid , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.

[14]  Yuan-Yih Hsu,et al.  A Minimal Harmonic Controller for a STATCOM , 2008, IEEE Transactions on Industrial Electronics.

[15]  D. G. Holmes,et al.  Improved Stationary Frame AC Current Regulation using Feedforward Compensation of the Load EMF , 2009, 2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition.