PMSM harmonic suppression control method based on PWM and improved quasi-resonance controller
A technology of harmonic suppression and control methods, which is applied in harmonic reduction devices, control/regulation systems, and AC networks to reduce harmonics/ripples, etc. It can solve problems such as complex implementation, high dependence on motor parameters, and inability to guarantee multiples , to achieve the effect of good control performance
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[0046] The present invention relates to a PMSM harmonic suppression control method based on PWM and improved resonant controller. The method first uses segmentation PWM synchronous modulation, and ensesse symmetry of three-phase PWM within the motor full-speed range, thereby enabling the motor 3 The multiple times and the even harmonic is removed as possible. For the remaining 6K ± 1 harmonics (in three-phase alternating current, generally does not contain even harmonics, no harmonics of 3 integer times, put these two items, the remaining is 6k ± 1 time (k = 1, 2, 3, 4, 5, ...)), use improved quasi-resonance controller to suppress it, the main process figure 1 Indicated.
[0047] Specific approaches are improved for the traditional resonant controller based on the transfer function. Based on the suppression of a particular second harmonic, a quasi-resonant controller is used instead of the original resonant controller, and the transfer function is discrete to the ...
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