A random svpwm modulation method for five-phase inverter

A technology of five-phase inverter and modulation method, which is applied in the direction of AC motor control, control system, conversion of AC power input to DC power output, etc. It can solve the problems that the improvement of high-frequency performance is not considered, and achieve the improvement of high-frequency performance, good low-frequency harmonic performance, and reduced amplitude

Active Publication Date: 2019-05-14
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0006] The purpose of the present invention is to address the deficiencies of the above-mentioned background technology and provide a five-phase inverter random SVPWM modulation method, which realizes double random switching period and zero vector action time, and improves the high frequency of the five-phase inverter. The performance and the characteristics of the concentrated distribution of harmonic energy solve the technical problems that the existing multi-phase inverter space vector pulse width modulation method has not considered the improvement of high-frequency performance and the inherent problems of traditional PWM.

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

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[0029] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings.

[0030] 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:

[0031]

[0032] In formula (1), k=0, 1, 2, 3...31 is a decimal number converted from a binary switching function.

[0033] According to the different combinations of the switch states of the bridge arms of each phase...

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Abstract

The invention discloses a five-phase inverter random SVPWM modulation method, belonging to the technical field of multi-phase inverter drive control. In each sampling period, the sampling period is kept constant, and the PWM pulse is randomly delayed to realize the randomization of the switching period. Double randomization of vector action times. The modulation method of the present invention can greatly reduce the amplitude of high-order harmonics without affecting the performance of low-frequency harmonics, and disperse the harmonics originally concentrated around the switching frequency and its integer multiples into a wider spectrum range , so as to obtain a more continuous and uniform frequency spectrum, effectively suppress electromagnetic interference and high-frequency noise, and improve the electromagnetic compatibility of the system.

Description

technical field [0001] The invention discloses a random SVPWM modulation method for a five-phase inverter, in particular to a random SVPWM modulation method for a five-phase inverter with randomized switching frequency and random distribution of zero-vector action time, which belongs to the technology of multi-phase motor drive control field. 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 reliability requirements, and high performance require...

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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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