The impact of sampling frequency and amplitude modulation index on low order harmonics in a 3-phase SV-PVM voltage source inverter

Authors : Qamil KABASHI, Myzafere LIMANI, Nebi CAKA, Milaim ZABELI

Pages : 184-199

View : 21 | Download : 13

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Nowadays, variable speed AC motors are widely used in industry and there are many speed adjustment techniques available. In the last decade there has been a trend towards the use of space vector PWM--IGBT inverters, due to easier digital realization and better utilization of the DC bus. Every power inverter produces a total harmonic distortion insert ignore into journalissuearticles values(THD); on its output that causes extra losses in stator of induction motors. By eliminating a number of low order voltage/current harmonics it is possible to reduce harmonic losses insert ignore into journalissuearticles values(stator losses); and mechanical oscillations in general. This could be achieved by implementing filters in the output of inverters or by applying a modern modulation technique such as space vector pulse width modulation insert ignore into journalissuearticles values(SV-PWM);. The objective of this paper is focused on using general techniques of SV-PWM in 2-level 3-phase voltage source inverters for inductive load tempting to eliminate the low order voltage/current harmonics, by varying sampling frequency and amplitude modulation index, without using filters.
Keywords : Space vector pulse width modulation SV PWM, THD total harmonic distortion, amplitude modulation index, switching frequency, harmonic losses