A Double Random Spread Spectrum Modulation Method Based on Four-state Markov Chain

A Markov chain and spread spectrum modulation technology, applied in motor generator control, control of electromechanical brakes, AC motor control, etc., can solve problems such as high harmonic energy, achieve continuous and flat spectrum, suppress electromagnetic interference, and reduce resources effect of overhead

Active Publication Date: 2021-11-09
苏州崧崧智能控制技术有限公司
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Problems solved by technology

This method is based on the double random spread spectrum modulation method of the four-state Markov chain to solve the disadvantages of the traditional SVPWM control strategy in the inverter output higher harmonic energy at the switching frequency and its integer multiples

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  • A Double Random Spread Spectrum Modulation Method Based on Four-state Markov Chain
  • A Double Random Spread Spectrum Modulation Method Based on Four-state Markov Chain
  • A Double Random Spread Spectrum Modulation Method Based on Four-state Markov Chain

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[0048] In order to make it easy to understand the technical means, creative features, work flow, and use methods of the present invention to achieve the purpose and effect, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0049] The connection structure between the three-phase inverter circuit and the motor is as follows: figure 1 shown. Among them, the DC side bus voltage is U dc , S 1 ~S 6 There are 6 power switching tube devices. Since the two power switching devices on the same side bridge arm have different states at the same time, the switching states of the three upper bridge arms are marked as S a , S b , S c . Taking phase A as an example, S a = 1, the switching device of the upper bridge arm is turned on; S a =0, the switching device of the lower bridge arm is turned on, and the other phases are the same. Therefore the switching device switching mode (S c ,S b ,S a ) total 2 3...

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Abstract

A dual random spread spectrum modulation method based on a four-state Markov chain of the present invention includes: S1, randomizing the switching frequency, determining the sector to which the target voltage vector belongs, and selecting two closest to the target voltage vector in the αβ plane Non-zero voltage vector, combining two zero vectors to synthesize target voltage vector; S2, according to the target voltage vector and the current switching cycle to obtain the action time of the two non-zero voltage vectors and the total action time of the zero vector; S3, according to the modulation index, Determine the allocation scheme of the zero vector; S4, arrange the action sequence of the basic vector according to the existing symmetrical seven-segment SVPWM modulation mode, and generate a PWM pulse waveform. The method of the invention can reduce the switching frequency and the harmonic energy at the frequency multiplication in the control of the three-phase permanent magnet synchronous motor, so that the output spectrum of the inverter voltage and current is dispersed and flattened, and the conducted electromagnetic interference is suppressed.

Description

technical field [0001] The invention relates to a motor control method, in particular to a double random spread spectrum modulation method based on a four-state Markov chain. Background technique [0002] Permanent magnet synchronous motor (Permanent Magnet Synchronous Motor, PMSM) uses permanent magnets instead of energized coils to generate excitation magnetic fields. It has been applied to various fields such as aerospace, industrial production, and daily life. [0003] The permanent magnet synchronous motor drive system is generally controlled by a pulse width modulation (Pulse Width Modulation, PWM) technology with a fixed switching frequency. When a fixed switching frequency is used to drive the motor, the switching device IGBT of the motor controller will be in a high-speed on-off mode, which will cause the harmonic voltage and current at the output of the motor driver to be concentrated near the switching frequency and its integral multiple frequency. Therefore, la...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/24H02P27/12H02M1/44
CPCH02M1/44H02P27/12H02P21/24
Inventor 武建飞颜心王少杰
Owner 苏州崧崧智能控制技术有限公司
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