A non-sinusoidal random svpwm modulation method for five-phase inverter

A five-phase inverter, modulation method technology, applied in AC motor control, control system, AC power input conversion to DC power output and other directions, can solve problems such as high frequency performance improvement, and achieve suppression of electromagnetic interference and high frequency noise. , the effect of suppressing electromagnetic interference, improving the characteristics

Active Publication Date: 2019-07-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

At present, the research on random modulation technology is limited to three-phase systems and their subsystems, and has not been applied to multi-phase systems composed of non-three-phase subsystems, and the non-sinusoidal SVPWM method for multi-phase inverters has not considered high The improvement of frequency performance, the inherent problems of traditional PWM-electromagnetic interference and the concentrated distribution of harmonic energy still exist

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  • A non-sinusoidal random svpwm modulation method for five-phase inverter
  • A non-sinusoidal random svpwm modulation method for five-phase inverter
  • A non-sinusoidal random svpwm modulation method for five-phase inverter

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Embodiment Construction

[0032] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings.

[0033] The topology of the five-phase voltage source inverter bridge is as follows: figure 1 shown. The DC bus voltage is U DC , each bridge arm has two upper and lower power switch tubes, whose turn-on and turn-off are controlled by PWM modulation signals. Define the switch function S=[S a ,S b ,S c ,S d ,S e ], taking phase a as an example, when the upper bridge arm switch is turned on, S a =1, when the lower bridge arm switch is turned on, S a = 0, and the other phases are the same. At the same time, only one switch tube of the upper and lower bridge arms is turned on, then the space voltage vector can be expressed as:

[0034]

[0035] In formula (1), k=0, 1, 2, 3...31 is a decimal number converted from a binary switching function.

[0036] According to the different combinations of the switch states of the bridge arms of each phas...

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Abstract

The invention discloses a non-sinusoidal random SVPWM modulation method for a five-phase inverter, belonging to the technical field of multi-phase motor drive control. The present invention selects two large vectors and two medium vectors surrounding the sector to which the fundamental wave reference voltage vector belongs to synthesize the fundamental wave reference voltage vector; The voltage vector synthesizes the third harmonic reference voltage vector; when calculating the vector action time, in each sampling period, keep the sampling period unchanged, randomly delay the PWM pulse and randomly assign two zero vector action times to achieve switching frequency and zero Double randomization of vector action times. The method disclosed in the present invention can linearly superimpose the torque components generated by the fundamental wave current and the third harmonic current when driving the motor, thereby increasing the torque density of the system, and greatly reducing the high The amplitude of the sub-harmonic wave can suppress electromagnetic interference and high-frequency noise, and improve the electromagnetic compatibility of the system.

Description

technical field [0001] The invention discloses a non-sinusoidal random SVPWM modulation method for a five-phase inverter, in particular to a five-phase inverter SVPWM method capable of simultaneously controlling fundamental wave and third harmonic output and double random switching frequency and zero vector action time , belongs to the technical field of multi-phase motor drive control. Background technique [0002] With the development of modern power electronics technology, microelectronics technology and control theory, the motor system driven by the inverter has got rid of the limitation of the three-phase power grid. A series of problems, multiphase motor systems have gradually received more and more attention. Compared with the three-phase motor system, the multi-phase motor system has the advantages of strong fault tolerance, high reliability, and small torque ripple. It is suitable for aerospace, ship propulsion, and electric vehicles with high power, high reliabili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5395H02M1/12H02M1/44H02P27/12
CPCH02M1/12H02M1/44H02M7/5395H02P27/12H02M1/0054Y02B70/10
Inventor 朱琳卜飞飞浦天宇黄文新
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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