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Transformer Neutral Current Suppression Method

A current suppression, transformer technology, applied in reactive power adjustment/elimination/compensation, reactive power compensation, multiphase network asymmetry reduction, etc. Line loss Transformer copper loss, iron loss and other issues

Active Publication Date: 2011-12-07
四川得丰电气有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For single-phase load users, due to the characteristics of single-phase load and power consumption, the unbalanced three-phase load of the transformer, the unbalanced three-phase voltage and current of the power supply point, and the increase of the neutral line current will increase the line loss, Transformer copper loss, iron loss, resulting in huge waste
Among them, the overload heating of the neutral line not only increases the loss and high inefficiency, but also causes zero potential drift, and generates electrical noise interference that can affect the computer system

Method used

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  • Transformer Neutral Current Suppression Method
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  • Transformer Neutral Current Suppression Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] The following non-limiting specific examples are given for further description.

[0037]In this example, the active current and reactive current on the load side of the transformer collected by current and voltage transformers are: , , , , . And it is determined by calculation that the effective value of the neutral current is about 13.97A.

[0038] 1. Set the compensation range:

[0039] In this example, the full capacitance compensation scheme is adopted (that is, when the compensation part is all capacitance compensation), and the range of capacitance compensation is not limited, the value range of the compensation amount is a non-negative real number, so the constraints of the range of reactive power compensation for:

[0040]

[0041] 2. Formulate a compensation plan when the amount of compensation is insufficient:

[0042] On the premise that the active power tends to be balanced and the reactive power tends to be zero, complete reactive power co...

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Abstract

The invention aims to provide a method for suppressing the neutral current of a transformer. In the method provided by the invention, a neutral current suppression model is constructed aiming at the influence of a compensation range of reactive power compensation on compensation effects based on the relation among interphase reactive power compensation, relative reactive power compensation and the second side current and load side current of the transformer by leading an optimization theory; and on the premise of ensuring the stability and reliability of compensation, the neutral current suppression is realized by setting constraint conditions and target function weight coefficients in the model. The method provided by the invention determines the optimal reactive power compensation quantity by solving the neutral current suppression model, thereby enabling the compensation effects and the reactive power compensation configuration to be optimal.

Description

technical field [0001] The invention belongs to the field of electric power systems, and in particular relates to a method for suppressing neutral line current of a transformer. Background technique [0002] In my country's urban and rural power grids, a large number of three-phase four-wire power distribution methods are used, and the distribution transformer Y / yn0 is connected. For single-phase load users, due to the characteristics of single-phase load and power consumption, the unbalanced three-phase load of the transformer, the unbalanced three-phase voltage and current of the power supply point, and the increase of the neutral line current will increase the line loss, Transformer copper loss, iron loss, resulting in huge waste. Among them, the overload heating of the neutral line not only increases the loss and high inefficiency, but also causes zero potential drift, and generates electrical noise interference that can affect the computer system. Therefore, it is nec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26H02J3/18
CPCY02E40/50Y02E40/30
Inventor 张占龙赵晖叶君江川肖冬萍
Owner 四川得丰电气有限公司
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