Design and Simulation Analysis of Hybrid Pulse Width Modulation for Urban Rail Traction System
摘要
In the urban railway industry, in order to achieve the stability and reliability of the permanent magnet motor control in urban railway vehicles, the on-off control of the switching device of the traction inverter circuit is used to obtain a series of pulses with the same threshold value at the three-phase output terminals, and these pulses can be used to replace the sine wave and the desired waveform. Then input an AC current of a certain frequency into the permanent magnet motor. In order to solve the phenomenon of unstable control of permanent magnet motors at different speeds, this paper proposes a specific harmonic elimination pulse width modulation (SHEPWM) hybrid pulse width modulation method, and uses Simulink software for modeling and simulation simulation waveforms, which proves that the mixed pulse width modulation method proposed in this paper Stability and reliability of the modulation output.