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Inverter Control Method

A control method and frequency converter technology, applied in the field of frequency converters, can solve the problems of large switching device loss, complex control algorithm, and high switching frequency, and achieve the effects of reducing switching loss, reducing complexity, and reducing common-mode voltage and switching frequency.

Inactive Publication Date: 2016-08-17
CHINA UNIV OF MINING & TECH
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  • Description
  • Claims
  • Application Information

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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 complicated, 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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Embodiment Construction

[0019] Embodiments of the present invention are described in detail below, but the present invention may be defined and covered by the claims

[0020] Implemented in many different ways.

[0021] 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 switch state value of each of the basic voltage vectors; according to the group number and switch state value of the switch state, remove each The switch state corresponding to the triangular area corresponds to a switch state with a higher com...

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Abstract

The invention relates to a control method for a frequency converter, which is characterized in that it includes: transforming a reference voltage vector from a Cartesian coordinate system to a 60-degree coordinate system; calculating a switch for each basic voltage vector according to the coordinates of the three basic voltage vectors state and switch state value; according to the number of switch states and the value of the switch state, remove the switch state corresponding to the switch state of each triangle area with higher common-mode voltage; determine a triangle where the reference voltage vector is located in the 60-degree coordinate system area; form a seven-segment SVPWM modulation signal according to the remaining switching states corresponding to a triangular area; map the seven-segment SVPWM modulation signal into a driving signal for driving a switch tube of the frequency converter, so as to control the frequency converter. Because the invention reduces the redundant state of the switch, reduces the complexity of the algorithm, improves the operating efficiency of the algorithm, and reduces the common mode voltage of the output voltage and the switching frequency.

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 Patents(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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