Improved hysteresis current control of three-level inverter for distribution static compensator application

This study proposes an improved scheme of hysteresis current control for a three-level distribution static compensator (DSTATCOM) application. The conventional two-level hysteresis controller offers advantages including ease of implementation and good dynamic performance, but the switching frequency is subjected to wide variation. Also, the maximum frequency may exceed tolerable limits, as the width of the current band becomes narrower. The basic three-level switching scheme overcomes the above drawback and results in a reduced switching frequency and lower switching losses but the actual current tracks the reference current either in the upper band or in the lower band, resulting in an increased tracking error. However, the suggested scheme results in reduced stress and losses of the inverter switches with a limited range of switching frequency as well as a low tracking error. A digital simulation of a three-phase, four-wire compensated system is carried out through MATLAB to verify the effectiveness of the suggested scheme and an experimental prototype is also built to validate the same.

[1]  Fang Zheng Peng,et al.  Multilevel inverters: a survey of topologies, controls, and applications , 2002, IEEE Trans. Ind. Electron..

[2]  G. Ledwich,et al.  An adaptive hysteresis current control for a multilevel inverter used in an active power filter , 2007, 2007 European Conference on Power Electronics and Applications.

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

[4]  T. S. Radwan,et al.  Analysis of current controllers for voltage-source inverter , 1997, IEEE Trans. Ind. Electron..

[5]  A. Joshi,et al.  Control Schemes for Equalization of Capacitor Voltages in a Neutral Clamped Shunt Compensator , 2002, IEEE Power Engineering Review.

[6]  Samir Kouro,et al.  Reduced Switching-Frequency-Modulation Algorithm for High-Power Multilevel Inverters , 2007, IEEE Transactions on Industrial Electronics.

[7]  Arindam Ghosh,et al.  A new approach to load balancing and power factor correction in power distribution system , 2000 .

[8]  Gerard Ledwich,et al.  A Hysteresis Current Control for Single-Phase Multilevel Voltage Source Inverters: PLD Implementation , 2002 .

[9]  Luis Moran,et al.  A three-phase active power filter operating with fixed switching frequency for reactive power and current harmonic compensation , 1995, IEEE Trans. Ind. Electron..

[10]  S. R. Bowes,et al.  Three-level hysteresis band modulation strategy for single-phase PWM inverters , 1999 .

[11]  Paolo Mattavelli,et al.  Comparison of current control techniques for active filter applications , 1998, IEEE Trans. Ind. Electron..

[12]  P. S. Ninkovic.  A novel constant-frequency hysteresis current control of PFC converters , 2002, Industrial Electronics, 2002. ISIE 2002. Proceedings of the 2002 IEEE International Symposium on.

[13]  B. Bose.  An adaptive hysteresis-band current control technique of a voltage-fed PWM inverter for machine drive system , 1990 .

[14]  D. G. Holmes,et al.  Implementation of three level hysteresis current control for a single phase voltage source inverter , 2000, 2000 IEEE 31st Annual Power Electronics Specialists Conference. Conference Proceedings (Cat. No.00CH37018).

[15]  Fangrui Liu,et al.  A Novel Variable Hysteresis Band Current Control of Three-Phase Three-Level Unity PF Rectifier With Constant Switching Frequency , 2006, IEEE Transactions on Power Electronics.

[16]  Arindam Ghosh,et al.  Frequency-domain characterization of sliding mode control of an inverter used in DSTATCOM application , 2006, IEEE Transactions on Circuits and Systems I: Regular Papers.

[17]  Simone Buso,et al.  A dead-beat adaptive hysteresis current control , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[18]  M.K. Mishra,et al.  A Minimally Switched Control Algorithm forThree-Phase Four-Leg VSI Topology toCompensate Unbalanced and Nonlinear Load , 2008, IEEE Transactions on Power Electronics.

[19]  Fang Zheng Peng,et al.  A generalized multilevel inverter topology with self voltage balancing , 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).

[20]  Paolo Mattavelli,et al.  High-performance hysteresis modulation technique for active filters , 1997 .

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

[22]  S. Portillo,et al.  Experimental results of a three-level voltage source inverter with hysteresis-band current control and hybrid PWM-SVM voltage control , 2003, IEEE 34th Annual Conference on Power Electronics Specialist, 2003. PESC '03..

[23]  Ting-Yu Chang,et al.  An improved hysteresis current controller for reducing switching frequency , 1994 .