Politeknik Elektronika Negeri Surabaya
International Journal of Engineering Technology
Abstract
In this research, modified PWM has been applied to the multilevel
inverter (MLI) single‐phase three‐level diode clamp full bridge.
Modified PWM is performed to produce minimum Total Harmonic
Distortion (THD) the voltage because the quality of the good voltage
is indicated by small THD. The THD indicates the quality of AC
voltage source. The THD standard by the IEEE STD 519‐1992
Harmonic Voltage Limits is 5% and the Pacific Corp standard is 8%, if
the THD value is greater than the THD standard it can cause the
electronic load to be damaged due to the damaged waveform.
Modified PWM is applied by adding a 50 Hz sinusoidal reference
signal with a sinusoidal signal which has a certain amplitude,
frequency and phase shift angle. The frequency of the adder signal is
the frequency at which the value of the individual harmonic voltage
appears (n harmonic). To get maximum result, optimization using
Genetic Algorithm (GA) method to determinate amplitude & phase
shift angle done. The result of implementation hardware with
modified PWM shows smaller THD voltage compared to the THD
voltage with Sinusoidal Pulse Width Modulation (SPWM) switching
up to 0.19 or decrease 65,51 % for modified PWM of harmonic
injection n = 7 with GA optimization ma= 0.8 (A=0.0936 and ø = 0
rad) and up to 0.08 or decrease 12,30 % for modified PWM of
harmonic injection n = 22 with GA optimization ma = 0.4 (A=0.1221
and ø = 0 rad).
Keywords: Multilevel Inverter, Modified PWM, Genetic Algorithm.
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