Nonlinear control techniques of a controllable rectifier/inverter-motor drive system with a small dc-link capacitor

Abstract The necessity of the converters compactness in many applications imposes the reduction of their different components size when it is possible. In this paper, a control method allowing the use of a small size dc-link capacitor for the cascade of voltage controlled-rectifier/inverter-motor drive system is proposed. This is achieved by adding the power balance equation in the system’s model and the application of an exact input/output feedback linearization technique in a way that the rectifier controller compensates any sudden change in the inverter load, which is here an induction motor. Since the exact input/output feedback linearization technique is sensitive to the uncertainties over system parameters, a robust control strategy based on sliding mode controller is proposed. By this approach, the dc-link voltage becomes almost insensitive to the load variations. As a result, the level of the dc-link voltage could be stabilized with a small size dc-link capacitor. Without any considerations of the RMS current stress on this dc-link capacitor, a calculation method of a minimum value of this capacitor based on its storage energy is proposed. All the investigations are shown by computer simulations and the performance of controlled system is verified by experimentation results.

[1]  Thomas G. Habetler,et al.  A space vector-based rectifier regulator for AC/DC/AC converters , 1993 .

[2]  Paolo Tenti,et al.  AC/DC/AC PWM converter with reduced energy storage in the DC link , 1995 .

[3]  Jean-Michel Dion,et al.  Applied nonlinear control of an induction motor using digital signal processing , 1994, IEEE Trans. Control. Syst. Technol..

[4]  Qiang Yin,et al.  Practical issues in the design of active rectifiers for AC drives with reduced DC-link capacitance , 2003, 38th IAS Annual Meeting on Conference Record of the Industry Applications Conference, 2003..

[5]  Ying-Yu Tzou,et al.  Analysis and design on the reduction of DC-link electrolytic capacitor for AC/DC/AC converter applied to AC motor drives , 1998, PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196).

[6]  Weiping Li,et al.  Applied Nonlinear Control , 1991 .

[7]  Kazuhiro Ohkura,et al.  Stable grasp planning by evolutionary programming , 2001, IEEE Trans. Ind. Electron..

[8]  Francesco Profumo,et al.  Performance comparison of output power estimators used in AC/DC/AC converters , 1994, Proceedings of IECON'94 - 20th Annual Conference of IEEE Industrial Electronics.

[9]  Namho Hur,et al.  A fast dynamic DC-link power-balancing scheme for a PWM converter-inverter system , 2001, IEEE Trans. Ind. Electron..

[10]  Alberto Tenconi,et al.  Analytical and Numerical Computation of RMS Current Stress on the DC Link Capacitor in Multiphase Voltage Source PWM Inverters , 2001 .

[11]  H. Zhang,et al.  Switching harmonics in the DC link current in a PWM AC-DC-AC converter , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.

[12]  S. Pierfederici,et al.  DC-link capacitor reduction of a controlled rectifier supplying N inverter-motor drive systems by compensating the load variations , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[13]  Gerhard Henneberger,et al.  Analytical computation of the RMS current stress on the DC-link capacitor in DC-link PWM converter systems powering N-phase rotating field machines in PWM and square wave mode , 2004 .

[14]  Weibing Gao,et al.  Variable structure control of nonlinear systems: a new approach , 1993, IEEE Trans. Ind. Electron..

[15]  R. Marino,et al.  Adaptive input-output linearizing control of induction motors , 1993, IEEE Trans. Autom. Control..

[16]  Jinhwan Jung,et al.  A feedback linearizing control scheme for a PWM converter-inverter having a very small DC-link capacitor , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).