DC-link voltage control for Switched Reluctance Drives with reduced DC-link capacitance

This paper presents a simple control method for Switched Reluctance Drives that enables the implementation of significantly smaller dc-link capacitors compared to conventional SR drive inverters. This is achieved by a direct control of the dc-link voltage. During the commutation of two neighboring phases, the switching states of the outgoing phase are chosen and alternated in such a way, that the dc-link voltage stays within a predefined range. The implementation is similar to a conventional current hysteresis control. In this paper, first an introduction to the problem is given followed by the description of the proposed control. The functionality of the control is shown by computer simulations and proven by measurements. Due to the fact that the control manipulates the current shape during demagnetization, also the influence on the overall drive efficiency has to be studied, which is done by computer simulations at the end of this paper.

[1]  C. Pollock,et al.  Two phase switched reluctance drive with voltage doubler and low dc link capacitance , 2005, Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005..

[2]  Mike Barnes,et al.  Power electronic converters for switched reluctance drives , 1998 .

[3]  Kwanghee Nam,et al.  A DC-link capacitor minimization method through direct capacitor current control , 2006, IEEE Transactions on Industry Applications.

[4]  Feng Liang,et al.  A new variable reluctance motor utilizing an auxiliary commutation winding , 1992, Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting.

[5]  Keunsoo Ha,et al.  Single-Controllable-Switch-Based Switched Reluctance Motor Drive for Low Cost, Variable-Speed Applications , 2012, IEEE Transactions on Power Electronics.

[6]  R. Krishnan,et al.  Analysis and design of a low cost converter for switched reluctance motor drives , 1989, Conference Record of the IEEE Industry Applications Society Annual Meeting,.

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

[8]  R. Krishnan,et al.  Design of a Single-Switch-Per-Phase Converter for Switched Reluctance Motor Drives , 1988, Proceedings.14 Annual Conference of Industrial Electronics Society.

[9]  Namho Hur,et al.  Fast dynamic DC-link power balancing scheme for a PWM converter-inverter system , 1999, IECON'99. Conference Proceedings. 25th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.99CH37029).

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

[11]  R. Krishnan,et al.  Single controllable switch power converter for SRM drive systems , 2005, 31st Annual Conference of IEEE Industrial Electronics Society, 2005. IECON 2005..

[12]  J.O. Fiedler,et al.  Calculation of switching frequency in current hysteresis controlled switched reluctance drives , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).