The Combination of Newton-Raphson Method and Curve-Fitting Method for PWM-based Inverter

Majdee Tohtayong (Department of Electrical Engineering, Princess of Naradhiwas University.)
Sheroz Khan (Department of Electrical and Computer Engineering, International Islamic University Malaysia.)
Mashkuri Yaacob (Department of Electrical and Computer Engineering, International Islamic University Malaysia.)
Siti Hajar Yusoff (Department of Electrical and Computer Engineering, International Islamic University Malaysia.)
Nur Shahida Midi (Department of Electrical and Computer Engineering, International Islamic University Malaysia.)
Musse Mohamud Ahmed (Department of Electrical and Electronics Engineering, Universiti Malaysia Sarawak.)
Fawwaz Wafa (Department of Electrical and Computer Engineering, International Islamic University Malaysia.)
Ezzidin Aboadla (Department of Electrical and Computer Engineering, International Islamic University Malaysia.)
Khairil Azhar Aznan (Department of Electrical and Computer Engineering, International Islamic University Malaysia.)

International Journal of Power Electronics and Drive Systems (IJPEDS)
Vol 8, No 4: December 2017

This paper presents the combination of two different methods to perform the waveform analysis for PWM-operated inverter. The two techniques are Newton-Raphson method and Curve-Fitting as a PWM concept to operate PWM-based inverter, the proper solutions of switching angles can valuate the initial values by using the Newton-Raphson method with the wide-step calculation of modulation indices. The solutions are then compared using a curve in order to study the behavior. Then, the Curve-Fitting method is used to estimate the missing solutions between any points of wide-step calculation. This combination method can estimate the probable solutions that cannot be solved by Newton-Raphson method in a wide-ranging of the modulation index and reduce the calculation time. PWM-based inverter, which is obtained the switching angles by Newton-Raphson method and the combination of two different methods, is verified by the simulation results showing faster performance with improved Total Harmonic Distortion (THD) than both methods alone when compared the same values of switching angles.