Five-phase inverter random SVPWM modulation method

A five-phase inverter, modulation method technology, applied in the direction of AC motor control, control system, AC power input into DC power output and other directions, can solve the problem of not considering the improvement of high frequency performance, to improve the high frequency High performance, high voltage utilization, and the effect of suppressing electromagnetic interference

Active Publication Date: 2017-05-31
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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  • Five-phase inverter random SVPWM modulation method

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Embodiment Construction

[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, and belongs to the technical field of multi-phase inverter drive control. In every sampling cycle, the sampling cycle is kept constant, a PWM pulse is delayed randomly, to achieve random change of a switch cycle, at the same time, two vector action time obtained through an NFV-SVPWM algorithm are randomly allocated, and double-random of switch frequency and zero vector action time is achieved. According to the five-phase random SVPWM modulation method, on the condition of not influencing low frequency-band harmonic performance, the amplitude of higher harmonic is drastically lowered, harmonic originally concentrated on the switch frequency and around the integral multiple switch frequency is dispersed into a wider frequency spectrum range, thus a more consecutive and even frequency spectrum is obtained, electromagnetic interference and high frequency noise are effectively inhibited, and the electromagnetic compatibility of the system is improved.

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 Applications(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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