Logistic-Chebyshev Cascaded Chaotic Space Vector Pulse Width Modulation for Common-Mode EMI Suppression in Motor Drive System

Space vector pulse width modulation (SVPWM) is widely used in motor drive systems, and chaotic SVPWM can effectively suppress common-mode voltage spikes at the switching frequency and its multiples on the EMI spectrum by varying the switching frequency randomly within a certain range. However, the current discrete chaotic mappings commonly used to realize chaotic SVPWM suffer from uneven probability density distribution and poor randomness under limited computational precision, reducing the EMI suppression effect. This paper analyzes the generation mechanism of common-mode EMI in motor drive systems and identifies shortcomings in traditional chaotic SVPWM. Then proposes a Logistic-Chebyshev cascaded chaotic SVPWM to enhance randomness and improve the probability density distribution of mappings, aiming to improve the effectiveness of chaotic SVPWM in suppressing common-mode EMI spikes in motor drive systems. The proposed method's effectiveness is validated through MATLAB/Simulink simulations. This method provides a new approach for suppressing common-mode EMI suppression in motor drive systems.