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A three-phase frequency conversion control method

A frequency conversion control, three-phase technology, applied in the field of three-phase frequency conversion, can solve the problems of low voltage utilization rate and low EMI, and achieve the effect of controlling dead time, reducing switching impact, and controlling accurately

Active Publication Date: 2018-11-02
郑州市铄晶电力科技有限公司
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Problems solved by technology

As we all know, SPWM technology has lower voltage utilization rate than SVPWM technology, but EMI is smaller

Method used

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  • A three-phase frequency conversion control method
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  • A three-phase frequency conversion control method

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Embodiment Construction

[0063] The technical solutions of the present invention will be further described in detail below in conjunction with the specific implementation manners of the accompanying drawings.

[0064] The technical problem to be solved by the present invention is that the existing frequency conversion control method does not make full use of the switch vector of the three-phase six-switch inverter bridge structure, resulting in either low voltage utilization or serious EMI, and adapts to different load structures. Sex is poor. Therefore, a 12-state full switch vector frequency conversion control method is proposed, so that the switch vector control angle is 30°, which can achieve the highest voltage utilization rate of the prior art, EMI compromise, and only need to modify the equivalent switch for different load structures voltage to calculate the switching time. In addition, appropriate arrangements can be made for 15 groups of invalid switching vectors, so that the switching dead ...

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Abstract

The invention discloses a three-phase frequency-converting control method. A switch control angle is reduced to be 30 degrees, and a more accurate control can be obtained; the control method is suitable for different loads, and the highest voltage utilization ratio can reach 1; when the switch is converted, the voltage change is reduced, so that the EMI reduction is facilitated; the existing three-phase six-switch inverter bridge structure is adopted; for solving the shortcomings in the prior art, a 12-state full-switch vector is adopted; a vector synthesis technology is used for choosing the switch control vector; and the corresponding switch vector time is calculated based on a principle that the product of voltage and time is equivalent so as to control the switch and to achieve the frequency-converting purpose.

Description

technical field [0001] The invention belongs to the technical field of three-phase frequency conversion, and relates to a three-phase frequency conversion control method. Background technique [0002] Three-phase frequency conversion technology is used more and more widely in modern society, and its essence is DC / AC conversion. Driven by the pursuit of high energy efficiency and high power-to-volume ratio, the PWM switch control technology is generally adopted based on the principle of equal voltage and time impulse by using the characteristics of the inertial components of the load. The most popular are the so-called SPWM (Sinusoidal Pulse Width Modulation) and SVPWM (Space Vector Pulse Width Modulation) techniques. [0003] The requirements for the output in the three-phase frequency conversion technology are that the voltage fundamental wave component is as high as possible, the harmonic component is as dispersed as possible, and the harmonic frequency is as far away fro...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5395
Inventor 董晓磊詹仲虎许晓飞
Owner 郑州市铄晶电力科技有限公司
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