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Control method for frequency converter

A control method and frequency converter technology, which is applied in the field of frequency converters, can solve the problems of large loss of switching devices, complex control algorithms, and high common-mode voltage, and achieve the goals of reducing switching loss, reducing complexity, reducing common-mode voltage and switching frequency Effect

Inactive Publication Date: 2014-02-26
CHINA UNIV OF MINING & TECH
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Problems solved by technology

The SVPWM algorithm is applied to multi-level inverters, but this algorithm has a large number of redundant switch states, which makes the control algorithm very complex, and the switching frequency is relatively high, the loss of switching devices is relatively large, and the output common-mode voltage is relatively high

Method used

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  • Control method for frequency converter
  • Control method for frequency converter

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Embodiment Construction

[0019] Embodiments of the invention are described in detail below, but the invention can be practiced in many different ways as defined and covered by the claims.

[0020] The present invention provides a control method of frequency converter, please refer to figure 1 , comprising: transforming the reference voltage vector from a rectangular coordinate system to a 60-degree coordinate system, the 60-degree coordinate system including a plurality of triangular areas; determining three corresponding to each of the triangular areas according to the 60-degree coordinate system The coordinates of the basic voltage vectors; according to the coordinates of the three basic voltage vectors, calculate the switch state and the switch state value of each of the basic voltage vectors; according to the number of the switch states and the switch state value, eliminate each The switch state corresponding to the triangular area corresponds to a switch state with a higher common-mode voltage; d...

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Abstract

The invention relates to a control method for a frequency converter. The control method is characterized by comprising the following steps: a reference voltage vector is transformed from under a rectangular coordinate system to under a 60-degree coordinate system; a switch state and a switch state value of each basic voltage vector are calculated according to coordinates of the three basic voltage vectors; according to number of the switch states and the switch state values, the switch states with a relatively high common-mode voltage in the corresponding switch states of each delta-shaped region are eliminated; one delta-shaped region in which the reference voltage vectors are located under the 60-degree coordinate system is confirmed; a seven-segment type SVPWM modulation signal is formed according to the corresponding rest of the switch states of one delta-shaped region; and the seven-segment type SVPWM modulation signal is mapped into a driving signal used for driving a switch tube of the frequency converter so that the frequency converter is controlled. Redundant states of a switch are reduced, complexity degree of an algorithm is reduced, operation efficiency of the algorithm is enhanced and the common-mode voltage of the outputted voltage and switching frequency are reduced.

Description

technical field [0001] The invention relates to the field of frequency converters, in particular to a control method for frequency converters. Background technique [0002] With the continuous development of power electronics technology, multi-level inverter technology has received more and more attention in the field of high-voltage and high-power applications. The multi-level inverter can increase the number of output voltage levels without increasing the switching frequency of the device, so that the output waveform has a better harmonic spectrum, the voltage stress on each switching device is smaller, and the switching loss is lower. Small, can avoid various problems caused by large dv / dt, and increase the capacity and withstand voltage of the system. [0003] The Space Vector Pulse Width Modulation (SVPWM) strategy is one of the modulation algorithms of the frequency converter system. The SVPWM algorithm is applied to multi-level inverters, but this algorithm has a la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483
Inventor 戴鹏王钊公铮吴强朱茂森吴斌聂雄邢履帅
Owner CHINA UNIV OF MINING & TECH
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