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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

Pending Publication Date: 2022-03-22
TONGJI UNIV
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Problems solved by technology

However, these methods are either complex to implement or highly dependent on motor parameters
Considering that when the motor speed range is wide, if the traditional asynchronous modulation method is used, as the speed increases, the carrier ratio will gradually decrease and the multiple of 3 cannot be guaranteed, so the symmetry of the three-phase PWM wave is difficult to guarantee

Method used

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  • PMSM harmonic suppression control method based on PWM and improved quasi-resonance controller
  • PMSM harmonic suppression control method based on PWM and improved quasi-resonance controller
  • PMSM harmonic suppression control method based on PWM and improved quasi-resonance controller

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Embodiment

[0046] The invention relates to a PMSM harmonic suppression control method based on PWM and an improved quasi-resonance controller. The method first adopts segmented PWM synchronous modulation to ensure the symmetry of the three-phase PWM within the full speed range of the motor, so that 3 Multiples of and even harmonics are eliminated as much as possible. For the remaining 6k±1 harmonics (in three-phase AC, generally no even harmonics, nor harmonics of integer multiples of 3, these two items are removed, and the rest is 6k±1 (k=1, 2, 3, 4, 5,...)), the improved quasi-resonant controller is used to suppress it, the main process is as follows figure 1 shown.

[0047] The specific method is to improve the traditional resonant controller based on the transfer function. On the basis of suppressing specific sub-harmonics, a quasi-resonant controller is used to replace the original resonant controller, and a double backward Euler method is used to discretize the transfer function ...

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Abstract

The invention relates to a PMSM harmonic suppression control method based on PWM and an improved quasi-resonance controller, and the method is characterized in that the SVPWM part of a PMSM is subjected to segmented PWM synchronous modulation, and the symmetry of three-phase PWM waves of a three-phase system is ensured; an improved quasi-resonance controller is adopted to further eliminate 6k + / -1 harmonic waves; performing resonant frequency correction on the three-phase system modulated by the improved quasi-resonant controller; a plurality of improved quasi-resonance controllers are connected in parallel, and harmonic waves of different orders are suppressed at the same time. Compared with the prior art, the method has the advantages that harmonic elimination in the full-rotating-speed range of the motor is achieved, and better control performance is achieved.

Description

technical field [0001] The invention relates to the technical field of motor drive and control, in particular to a PMSM harmonic suppression control method based on PWM and an improved quasi-resonant controller. Background technique [0002] Permanent Magnet Synchronous Motor (PMSM) has the characteristics of high power density, high work efficiency, small size, low noise, no wear and fast response, so it is widely used in various industries. Usually, SVPWM in permanent magnet synchronous motor control generally adopts asynchronous modulation. This method is not only easy to implement, but also can maintain a high carrier ratio in the low frequency band, thereby achieving suppression of current harmonics, reducing harmonic losses, and improving motor performance. life. [0003] However, since the frequency of the carrier signal remains unchanged, it is difficult to keep the carrier ratio at an integer multiple of 3 for three-phase PWM, which makes it difficult to ensure the...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02J3/01H02H3/08H02J3/26H02K1/27
CPCH02M3/335H02J3/01H02H3/08H02J3/26H02K1/27Y02E40/40Y02E40/50Y02B70/10
Inventor 朱元杨刚
Owner TONGJI UNIV
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