The random switching frequency modulation strategy can suppress high frequency harmonics by randomly changing the switching frequency in a certain spread spectrum range However

an excessively wide spread spectrum can cause serious current distortion and increase torque ripple. Therefore

this paper proposes a random switching frequency SVPWM (RSF-SVPWM) considering random number variation in a narrow spread spectrum. Compared with the traditional random switching frequency method

this strategy limits the maximum step change of the random variable. This reduces its average inter-period variation without altering its probability density

thereby achieving a more uniform distribution of high- frequency harmonics across the spread spectrum band and effectively suppressing them within the target narrow range. The experimental results show that the proposed method can reduce the peak harmonics of the switching frequency and its integer multiples more effectively in the same spread spectrum range.