Open Access Open Access  Restricted Access Subscription or Fee Access

A Simple and Cost Effective Dead Time Elimination Scheme for Suppression of Vibrations in Elevator System

A. Ramya, R.L. Helen Catherine

Abstract


In this paper, a vibration suppression scheme is proposed for the riding comfort of elevator using dead time elimination scheme. Dead time is used for pulse width-modulation (PWM) controlled inverter/converter control to avoid shoot through of high-side and low-side power devices. To deal with dead time problems polarity of current detection is necessary The presented scheme does not require current sensors for polarity detection. Depending on the polarity of terminal voltage of each leg the current polarity is determined. Current polarity is detected regularly with a sampling frequency which is higher than the switching frequency to reduce the detection error. Hence separate power supplies are not required which reduces the bulkiness and cost of this scheme. Based on the polarity of sensed voltage the SPWM signals are generated to turn ON the switches of inverter. The presented scheme eliminates the dead time and therefore improves output voltage loss and current distortion and torque ripples. The corresponding elevator vibrations are conspicuously reduced. Simulation results for single phase and three phase inverter are done in MATLAB. The above scheme is verified by implementing it in a single phase inverter controlled motor. Hardware results are presented to demonstrate the effectiveness of the scheme.

Keywords


Dead-Time Elimination, Elevator, Pulse Width Modulation, Vertical Vibration

Full Text:

PDF

References


Yong-Kai Lin and Yen-Shin Lai, ―Dead-Time Elimination of PWM-Controlled Inverter/Converter without Separate Power Sources for Current Polarity Detection Circuit,‖ IEEE Transactions On Industrial Electronics, Vol. 56, No.6, June 2009.

T. Hoshino, J. I. Itoh, and T. Kaneko, ―Dead time voltage error correction with parallel disturbance observers for high performance V/f control,‖ in Conf. Rec. IEEE IAS Annu. Meeting, pp. 2038–2044 June 2007

N. Urasaki, T. Senjyu, K. Uezatoand, and T. Funabashi, ―Adaptive deadtime compensation strategy for permanent magnet synchronous motor drive,‖ IEEE Trans. Energy Convers., vol. 22, no. 2, pp. 271–280, June. 2007.

Y. S. Lai and F. S. Shyu, ―Optimal common-mode voltage reduction PWM technique for inverter control with consideration of the dead-time effects—Part I: Basic development,‖ IEEE Trans. Ind. Appl., vol. 40, no. 6, pp. 1605–1612, Nov./Dec. 2004.

C. Attaianese, V. Nardi, and G. Tomasso, ―THD and power losses optimization by means of variable frequency space vector modulation,‖

in Proc. IEEE PESC, 2005, pp. 962–968.

Lihua Chen,‘ Dead-Time Elimination for Voltage Source Inverters‘, IEEE Transactions On Power Electronics, Vol. 23, No. 2, March 2008.

M. F. N. Tajuddin, N. H. Ghazali, ‗Implementation of DSP Based SPWM for Single Phase Inverter‘, International Symposium on Power Electronics, Electrical Drives, Automation and Motion, 2010.

Ho-Seon Ryu, ‗A Dead Time Compensation Method in Voltage-Fed PWM Inverter‘, IEEE Transactions on Industrial Electronics, 2006.

Young-Min Lee, Jun-Koo Kang and Seung-Ki SUI, ―Acceleration Feedback Control Strategy for Improving Riding Quality of Elevator System,‖ IEEE Industry Applications Society 34‘h Annual Meeting, 1999, pp 1375-1382

N. Urasaki, T. Senjyu, K. Uezato and, and T. Funabashi, ―Adaptive dead time compensation strategy for permanent magnet synchronous motor drive,‖ IEEE Trans. Energy Convers., vol. 22, no. 2, pp. 271–280, Jun. 2007.

Muhammad H. Rashid , ‗ Power Electronics circuits devices and applications‘,1998, New Delhi, .Prentice Hall of India.

M.D Singh and K.B Khanchandani , ‗ Power Electronics‘, 1998, New Delhi, Tata McGraw-Hill company.


Refbacks

  • There are currently no refbacks.


Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.