A New Approach to Analysis of Inverter Currents


  • Pekik Argo Dahono Laboratorium Penelitian Konversi Enegri Elektik, Institut Teknologi Bandung


inverter, peluang sinyal ON, arus-arus komponen, mak arus masukan, ON signal probability, device currents, input current ripple.


In this paper, a new approach to analysis of the average and rms currents in inverter switching devices and the rms value of the ripple component of inverter input current is presented. The proposed approach is based on the probability with which the inverter switching devices receive ON signals which can be obtained from the average value of the phase-to-dc midpoint voltages. As the knowledge of the exact switching pattern is not required, this approach is especially useful for inverters in which the exact switching patterns can not be predetermined. To show the general applicability of the proposed approach, the expressions for the average and rms currents in switching devices and the rms value of the ripple component of input current of three-phase hysteresis current-controlled and PWM inverters are derived. Experimental results are included to show the validity of the proposed method.


Suatu Pendekatan Baru untuk Analisis Arus-arus Inverter

Dalam makalah ini dipresentasikan, suatu pendekatan baru umtuk analisis arus rata-rata dan rms pada komponen-komponen switching inverter dan nilai rms riak arus masukan inverter. Pendekatan yang diusulkan berbasis pada peluang komponen-komponen switching inverter menerima sinyal ON yang didapatkan dari nilai rata-rata tegangan fasa keluaran. Karena pengetahuan detil tentang pola switching inverter tidak diperlukan, metoda yang diusulkan sangat cocok untuk analisis arus-arus pada inverter dengan pola switching yang tidak bisa ditentukan. Untuk menunjukkan luasnya daerah penerapan, persamaan-persamaan arus rata-rata dan rms komponen switching dan nilai rms riak arus masukan dari inverter yang menggunakan pengendali arus jenis hysteresis dan yang menggunakan pengendali PWM diturunkan. Hasil pengukuran disertakan untuk menunjukkan validitas metoda yang diusulkan.


P. D. Ziogas and P. N. D. Photiadis, An Exact Input Current Analysis of Ideal Static PWM Inverters, IEEE Trans. Ind. Appl., Vol. 19, No. 2, March/April 1983, pp. 281-195.

P. D. Ziogas, E. P. Wiechmann, and V. R. Stefanovic, A Computer-Aided Analysis and Design Approach for Static Voltage Source Inverters, idem, Vol. 21, No. 5, Sept./Oct 1985, pp. 1234-1241.

P. D. Evans and R. J. Hill-Cottingham, DC Link Current in PWM Inverters, IEE Proc., Vol. 113-B. July 1986, pp. 217-224.

Y. Ikeda, J. Itsumi, and H. Funato, The Power Loss of the PWM Voltage-Fed Inverter, Conf. Rec. IEEE PESC, 1988, pp. 277-283.

J. W. Kolar, H. Ertl, and F.C. Zach, lnfluence of the Modulation. Method on the Conduction and Switching Losses of a PWM Converter System, IEEE Trans. Ind. Appl., Vol 27. No. 6, Nov./Dec. 1991, pp. 1063-1075.

R. C. Thurston and S. F. Legowski, A Simple and Accurate Method of Computing Average and RMS Currents in a Three-Phase PWM Inverter. IEEE Trans. Power Electr., Vol. 8, No. 2, April 1993, pp. 192-199.

S. C. Peak and J. L. Oldekamp, A Study of System Losses in a Transistorized Invener-Induction Motor Drive System, IE E Trans. Ind. Appl,. Vol. 21, No. 1, Jan./feb. 1985, pp. 248-258.

D. M. Divan, G. Venkataraman, and R. W. DeDoncker, Design Methodologies for Soft Switched Inverters, idem, Vol. 29, No. 1, Jan./Feb. 1993, pp. 126-135.

W. McMurray, Modulation of the Chopping Frequency in DC Choppers and PWM- lnverters Having Current-Hysteresis Controllers, idem, Vol. 20, No. 4, July/August 1984, pp. 763-768.

J. Zubek, A. Abbondanti, and C. J. Nordby, Pulsewidth Modulated Inverter Motor Drives with Improved Performance, idem, Vol. 11, No. 6, Nov./Dec/ 1975, pp. 695-703.

A.M. Trzynadlowski, S. Legowski, and R. L. Kirlin, Random Pulsewidth Modulation Techniques for Voltage-Controlled Power Inverters, Conf. Rec. IEEE Ind. Appl. Soc. Ann. Meet., 1987, pp. 863-868.