Analysis of harmonic effects of high voltage circuit breaker asynchronous motors under different frequency of SVPWM vector control

SVPWM vector control highly optimizes the harmonic, and has the characteristics of fast dynamic response and small torque ripple. For this reason, under the SVPWM vector control strategy, only the carrier frequency is changed to simulate and analyze the influence of different carrier frequencies on harmonics. This paper first analyzes the sampling principle of SVPWM, and establishes the model of carrier frequency and harmonics relationship. Then, this paper simulates the asynchronous motor system under SVPWM vector control, analyzes the stator current, rotor speed and torque waveform, and can get the characteristics of low harmonics, fast dynamic response and small torque ripple.Finally, the A-phase stator current is taken as an example.Only the carrier frequency is changed to take 3KHz, 4KHz and 5KHz for FFT analysis. Comparing the THD of the three,it can be concluded that the larger the carrier frequency, the smaller the THD, the smaller the harmonic loss.