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Method and apparatus for producing three-phase current

一种三相电流、设备的技术，应用在三相电压源逆变器领域，能够解决输出电流总谐波失真差等问题，达到降低总大小和成本、高功率密度的效果

Active Publication Date: 2014-08-27
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The total harmonic distortion (THD) of the output current will be very poor

Method used

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  • Method and apparatus for producing three-phase current
  • Method and apparatus for producing three-phase current
  • Method and apparatus for producing three-phase current

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Embodiment Construction

[0037] The present disclosure discloses a method for generating three-phase current. This method can be used to generate a three-phase current from a DC voltage which can be generated, for example, by a renewable energy source. A device implementing the disclosed method can be used, for example, to convert a DC voltage generated by a solar power plant or by a wind generator into a three-phase sinusoidal current at the three-phase output of an inverter.

[0038] The output can be connected to, for example, a three-phase AC power grid or a load.

[0039] The disclosed method includes generating positive, negative and intermediate currents.

[0040] Typically, at a given time, the phases have only one highest, one lowest, and one middle phase, at least ignoring the instants at which the values ​​of the phases forming the sinusoidal three-phase signal cross each other (i.e., between the highest and lowest between phases).

[0041] Thus, the resulting positive current of the dis...

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PUM

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Abstract

The present disclosure discloses a method and an apparatus for implementing the method for producing a three-phase current to a three-phase output. The method comprises producing a positive current, a negative current, and an intermediate current by using switching converters. The produced positive current follows a path of a highest phase of a sinusoidal three-phase signal at a given time, the produced negative current follows a path of a lowest phase of the three-phase signal at the given time, and the produced intermediate current follows a path of a phase of the three-phase signal between the highest and the lowest phase at the given time. The produced currents are switched to each phase conductor of the three-phase output in sequence so that phase currents of the three-phase current are formed in the output conductors.

Description

technical field [0001] The present invention relates to three-phase voltage source inverters, and more particularly to the conversion of DC voltage into three-phase currents by using multi-level current concepts. Background technique [0002] Facilities that generate renewable energy can be considered as key components in next-generation power systems such as smart grids and microgrids. They can also provide an alternative power source to conventional energy sources such as oil, coal, and natural gas [1]. [0003] A common denominator for renewable energy generation processes is the use of inverters in the process as an interface for transforming renewable energy available in the form of direct current (DC) voltage into alternating current (AC) voltage. Thus, DC / AC inverter technology can play an important role in generating renewable energy, especially in high power three-phase grid connection applications. [0004] The DC / AC inverter technique can be implemented in vario...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02J3/38
CPCH02M7/49H02M7/537H02M7/493H02M7/487H02M7/4837H02M1/0043H02M3/335H03B1/00
Inventor 何艺文格拉尔多·埃斯科巴尔弗朗西斯科·卡纳莱斯
Owner ABB (SCHWEIZ) AG
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