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dc compensation for large dc currents in transformers

A technology of transformers and controllers, applied in transformer/inductor circuits, preventing/reducing unwanted electrical/magnetic effects, etc.

Active Publication Date: 2018-04-13
SIEMENS ENERGY GLOBAL GMBH CO & KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The techniques proposed in the prior art only help to protect equipment from large DC currents, there is no technical solution available for compensating large DC currents in transformers, especially GIC

Method used

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  • dc compensation for large dc currents in transformers
  • dc compensation for large dc currents in transformers

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Embodiment Construction

[0019] Various embodiments are described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It is evident that the embodiments may be practiced without these specific details.

[0020] figure 1 A block diagram of a DC compensation system 100 according to an embodiment of the invention is shown.

[0021] DC compensation system 100 includes transformer 102 , high voltage line 104 , low voltage line 106 , controller 110 , power electronics 112 , and controllable branches / devices 114 . exist figure 1 A sensor not shown in is connected to the top of the iron core of the transformer 102 . The sensor measures the magnetic voltage at the core of the transformer 102 and compares the positive and negative half cycles to detect the DC component. Based on ...

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Abstract

A system and method for compensating for one or more DC components in an electrical system are disclosed. The system disclosed in the present invention includes one or more sensors for sensing the one or more DC components. The system also includes one or more DC component controllers for generating one or more reference signals based on the one or more signals received from the one or more sensors. In addition, the system has: one or more controllers for generating one or more firing pulses based on the one or more reference signals received from the one or more DC component controllers and one or more valve arrangements for charging one or more controllable branches to balance said one or more DC components of said electrical system.

Description

technical field [0001] The present invention relates to a method and system for performing DC compensation in a transformer, in particular to a method and system for performing DC compensation on a large DC current in a transformer core. Background technique [0002] In a power grid, a transformer is coupled between the AC power system and the converter. DC currents in the power grid can negatively affect transformers. In principle, the time derivative of the flux in the core of the transformer is proportional to the voltage at the transformer terminals. Under ideal operating conditions, that is, when the DC current does not affect the iron core of the transformer, the terminal voltage and load current of the transformer are practically sinusoidal and symmetrical in polarity. Therefore, the magnetic flux is also symmetrical, that is, the positive half cycle and the negative half cycle of the magnetic flux are symmetrical, and equal magnetic force is generated in the two ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F27/34H01F27/42
CPCH01F27/34H01F27/42G05F3/08
Inventor P.厄恩斯特P.汉伯格J.洛特斯G.皮尔茨M.维辛格F.巴兴格C.凯普林格
Owner SIEMENS ENERGY GLOBAL GMBH CO & KG
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