Hysteresis random spectrum spreading method in inverter random pulse width modulation selective resonance elimination
A pulse width modulation and inverter technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problem of controlling the instantaneous switching frequency and average switching frequency of the inverter, Issues such as the switching period and the general formula of random numbers are not given, achieving the effect of simple algorithm, easy implementation, and strong control flexibility
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[0039] A hysteresis random spread spectrum method in random pulse width modulation selective harmonic elimination of inverters, such as figure 1 shown, including the following steps:
[0040] Step S1: Based on each cycle frequency f of the inverter m The summation is performed to obtain the average value f of the inverter switching frequency An ;
[0041] Step S2: Set the frequency hysteresis upper and lower limits f 1 and f 2 ;
[0042] Step S3: The average value of the inverter switching frequency f An with the upper and lower limits of the frequency hysteresis f 1 and f 2 Perform comparison to obtain hysteresis comparison results;
[0043] Step S4: Determine the average switching frequency error Δf according to the hysteresis comparison result;
[0044] Step S5: Determine a random number k according to the value of the switching frequency error Δf;
[0045] Step S6: Based on the random number k and the method of selective harmonic elimination, the sampling period T ...
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