Frequency conversion device and voltage transformation method thereof

A technology of frequency conversion devices and frequency converters, applied in the field of frequency converters, can solve the problems of increasing material operating costs and product operating costs, large dudt values, and high device costs, so as to reduce material operating costs and product operating costs, reduce research and development costs, The effect of high material reusability

CN109462340AInactive Publication Date: 2019-03-12SHANGHAI SIGRINER STEP ELECTRIC
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-03-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

Embodiments of the invention relate to a frequency converter, and disclose a frequency conversion device and a voltage transformation method thereof. In the invention, the frequency conversion devicecomprises the following parts: a plurality of frequency converters; a main control module, electrically connected with each of the frequency converters, and used for phase shifting 1 / N switching cycles required for each frequency converter when the power is turned on, so that the respective PWM pulses required by each frequency converter when the power is turned on are mutually staggered; and a first voltage transformation module, electrically connected to each of the frequency inverters, and used for coupling and superimposing two output line voltages of any two frequency inverters on the same vector edge and the output line voltages of the other frequency inverters in the same direction as the vector edge. Compared with the prior art, medium-voltage frequency converters can be formed byuniversal low-voltage frequency converters, so that the universal low-voltage frequency converters can be fully multiplexed, the frequency conversion device can generate required stable rated voltagesby low technical difficulty and simple control, and development costs and material management costs are also reduced.
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Description

technical field

[0001] Embodiments of the present invention relate to frequency converters, in particular to frequency conversion devices and voltage conversion methods thereof. Background technique

[0002] Medium-voltage frequency converters are widely used in various fans, water pumps, compressors, rolling mills, etc.

[0003] At present, medium-voltage inverters mostly use 3300V IGBT devices to form a two-level topology to achieve 1140V frequency conversion output, or use 1700V IGBT devices to form a three-level topology to achieve 1140V frequency conversion output. Or when it is necessary to achieve a higher voltage inverter product such as a 2300V inverter, it is necessary to use more 3300V IGBT devices or 1700V IGBT devices. However, the inventors found that the 3300V IGBT device in the existing market is not a common standard device in the industry, and the cost of the device is high and the delivery time is unstable. The frequency converter developed with 3300V cl...

Examples

Embodiment Construction

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, various implementation modes of the present invention will be described in detail below in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that, in each implementation manner of the present invention, many technical details are provided for readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in this application can also be realized.

[0030] The first embodiment of the present invention relates to a frequency conversion device, such as figure 1 As shown, it includes at least two frequency converters, a main control module, and a first transformer module. The main control module is electrically connected to each frequency converter, and 1 / ...