Hysteresis random spread spectrum method in selective harmonic cancellation of inverter random pulse width modulation
A technology of pulse width modulation and inverter, applied in the direction of output power conversion device, conversion of AC power input to DC power output, electrical components, etc. Inverter instantaneous switching frequency and average switching frequency and other issues, to achieve the effect of simple algorithm, easy implementation, and strong control flexibility
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[0039] A hysteresis random spread spectrum method in the selective harmonic elimination of inverter random pulse width modulation, such as figure 1 shown, including the following steps:
[0040] Step S1: Based on each cycle frequency f of the inverter m Summation to get the average value of the inverter switching frequency f An ;
[0041] Step S2: Set the upper and lower limits f of the frequency hysteresis 1 and f 2 ;
[0042] Step S3: Calculate the average value of the inverter switching frequency f An with the frequency hysteresis upper and lower limits f 1 and f 2 Make a comparison to get the hysteresis comparison result;
[0043] Step S4: according to the hysteresis comparison result, determine the average switching frequency error Δf;
[0044] Step S5: according to the value of the switching frequency error Δf, determine the random number k;
[0045] Step S6: Based on the random number k and the method of selective harmonic elimination, obtain the sampling period...
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