In addition to the third harmonic, there is another THIPWM technique that uses a higher order triple harmonic such as the ninth harmonic. The THIPWM technique has a disadvantage of implementation complexity of the third harmonic and steady- state current harmonic characteristics inferior to the SVPWM method. However, this amplitude incurs a slight decrease in the maximum linear modulation value to MI=1.12. Instead of the factor of 1/6, it is known that a third harmonic with an amplitude of 1/4 of the voltage reference can lead to a minimum harmonic distortion on the output voltage. This value corresponds to 90.7% of the output voltage for a six-step inverter. Accordingly, the fundamental component of the phase voltage can be increased by 15.5% (=1/0.866). The addition of a third harmonic with an amplitude of 1/6 of the voltage reference can reduce the peak value of the voltage reference by a factor of 0.866 without changing the amplitude of the fundamental component. (7.44), the optimum value of V 3 that maximizes the fundamental of the phase voltage is V 1 / 6. (7.44) v a n * = V 1 sin ω t + V 3 sin 3 ω tįor Eq.
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