Abstract
At present the Space Vector Pulse Width Modulation (SVPWM) technique has been widely used in the variable frequency control system,but the technique will make the system produce higher harmonic components at the switching frequency integer multiple times,thus the harmonic produce the high frequency noise.In the face of this problem, this paper adopts double random SVPWM technique which is added two state Markov chain to effectively reduce the high frequency noise.The technique makes the harmonic components amplitude value of the output current reduced effectively in the inverter of the variable frequency control system,so that the more output current is more relatively evenly distributed in the wide frequency range,so as to minimize the electromagnetic noise.
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