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A svpwam modulation method based on three-level direct matrix converter

A technology of matrix converter and modulation method, which is applied in the direction of high-efficiency power electronic conversion, conversion of AC power input to AC power output, electrical components, etc., and can solve problems such as complex wiring, narrow output frequency range, and many thyristors

Active Publication Date: 2019-10-18
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

This kind of converter also has many disadvantages, such as: more thyristors are used, and the wiring is more complicated; it uses phase-controlled rectification, and the power factor is low; the output frequency range is narrow, only 1 / 3 to 1 / 2 of the grid frequency
Therefore, the traditional AC-AC frequency conversion can only be used in large-capacity, low-speed and heavy-duty occasions, such as mine hoists, rock crushers, etc.

Method used

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  • A svpwam modulation method based on three-level direct matrix converter
  • A svpwam modulation method based on three-level direct matrix converter
  • A svpwam modulation method based on three-level direct matrix converter

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Embodiment

[0071] figure 1 It is a three-level direct matrix converter (TLDMC) topology. In the figure, u a , u b , u c is the three-phase input voltage; i a i b i c is the three-phase input current; L a , L b , L c and C a 、C b 、C c Inductance and capacitance of input LC three-phase filter; u as , u bs , u cs is the three-phase input voltage after the filter; i as i bs i cs is the three-phase input current through the filter; u A , u B , u C is the three-phase output voltage; i A i B i C is the three-phase output current; S ij Indicates a bidirectional switch with bidirectional turn-off and bidirectional turn-on capabilities,

[0072] Define the on and off states of the bidirectional switch as:

[0073]

[0074] According to the safety principles that must be followed in the operation process of the matrix converter, the restriction conditions of the switching function can be obtained as follows:

[0075] S ia +S ib +S ic +S in = 1i∈{A,B,C}

[0076] The...

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Abstract

The present invention relates to a kind of SVPWAM modulation method based on three-level direct matrix converter, modulation method comprises the following steps: (1) determine the expected input phase current space vector and output phase voltage space vector of three-level direct matrix converter; 2) The three-level direct matrix converter is virtualized as a series circuit model including a virtual rectification stage and a virtual inverter stage; (3) SVPWAM modulation is used for the virtual rectification stage to determine the switching signals of each switching tube of the virtual rectification stage; (4) SVPWM modulation is used for the virtual inverter stage to determine the switching signals of each switching tube of the virtual inverter stage; (5) the switching signals of each switching tube of the virtual rectification stage and the switching signals of each switching tube of the virtual inverter stage are converted into three-level direct The switching signal of each bidirectional switch of the matrix converter. Compared with the prior art, the invention can reduce the switching times to the greatest extent, reduce the switching loss, and at the same time reduce the harmonic content of the input current and improve the quality of the power grid.

Description

technical field [0001] The invention relates to a control method of a three-level direct matrix converter, in particular to a SVPWAM modulation method based on a three-level direct matrix converter. Background technique [0002] AC power converters can be divided into AC-DC-AC converters and AC-AC converters according to their forms. Among them: the AC-DC-AC converter is composed of a rectifier side, an inverter side and an intermediate DC link; the AC-AC converter generally does not include a DC link, and realizes direct conversion from AC to AC. AC-AC power converters mainly include traditional AC-AC converters and matrix converters. [0003] Although the research and utilization of the AC-DC-AC converter has made great progress, with the continuous deepening of the concept of energy conservation and environmental protection, there are still many deficiencies, such as the converter has an intermediate DC link, which increases the size of the device and Installation cost,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/293
CPCH02M5/293H02M1/0054H02M5/2937Y02B70/10
Inventor 程启明陈路孙伟莎李涛程尹曼魏霖沈磊王玉娇
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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