Harmonics Analysis in Control System. Limei Zhao 06/06/03. Origin of Noise. DSP part Fast switching frequency Voltage Source Inverter Thermal noise Dv/Dt effects LPF Thermal loss Motor EM interaction Acoustic interaction. PWM Signal from DSP. Signal after VSI before LPF.
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The signal is before VSI
n = p* k ± 1, where k = 1, 2, 3, …; p is the number of pulse
Hn = H1/n
Over voltage is decreased
Switching losses are decreasedSome Useful Filter(1) --- Dv/Dt Filter (Soft Switching)
Simple and reliable
For tune frequency: THDI<5%
Increase in the input power factor due to capacitive current
Limited spectrumSome Useful Filter(2)--- Passive Sinusoidal Filter
Red is phase to phase voltage ; Green is phase current
@ about 60KRPM with LPF(L=150uH)