Method and device for detecting direct-current component in alternating current

A DC component and AC technology, applied in the field of electricity, can solve the problems of low integration, high cost, and low reliability, and achieve the effect of simple circuit structure and reliable operation

Inactive Publication Date: 2012-05-02
北京国基科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Embodiments of the present invention provide a method and device for detecting DC components in AC power, which are us

Method used

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  • Method and device for detecting direct-current component in alternating current
  • Method and device for detecting direct-current component in alternating current
  • Method and device for detecting direct-current component in alternating current

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Embodiment Construction

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0051] Such as figure 2 Shown is a flowchart of a method for detecting a DC component in an AC power according to an embodiment of the present invention.

[0052] Including, step 201, performing polarity separation on the AC signal to be tested, and dividing it into electrical signals of positive half cycle and negative half cycle.

[0053] Step 202, canceling the electrical signal of the positive half cycle and the electrical signal of the negative half cycle. ...

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Abstract

The invention relates to the field of electrics, in particular to a method and a device for detecting a direct-current component in alternating current. The method comprises the following steps: performing polarity separation on an alternating current signal to be detected into a positive semi-circle electric signal and a negative semi-circle electric signal; performing offset on the positive semi-circle electric signal and the negative semi-circle electric signal; and detecting the direct-current component after the positive semi-circle electric signal and the negative semi-circle electric signal are offset. Through the embodiment of the invention, the direct-current component is obtained through separating alternating and direct current mixed signals into the positive semi-circle electric signal and the negative semi-circle electric signal and offsetting the positive semi-circle electric signal and the negative semi-circle electric signal, and high integration can be realized through a simple circuit structure. Moreover, the operation is reliable and stable. The method and the device for detecting the direct-current component in the alternating current are suitable for various severe environments.

Description

technical field [0001] The invention relates to the field of electricity, in particular to a method and a device for detecting a DC component in an AC current. Background technique [0002] The DC component or DC bias in the power generation and transmission network will directly lead to increased noise and vibration of the grid transformer, and even cause local overheating and damage of the transformer; In severe cases, it will lead to half-wave saturation of the transformer iron core, causing a sharp increase in the excitation current and severe distortion of the waveform. A large number of high-order harmonics generated will not only cause serious interference to electrical appliances connected to the power grid, but may also cause a large amount of power consumption of the transformer. Reactive power causes voltage fluctuations in the power grid, which poses a serious threat to the safe operation of the power system and must be strictly monitored. [0003] However, DC b...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R15/00
Inventor 韦雄观黄建宁
Owner 北京国基科技股份有限公司
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