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Single-phase transformer model for calculating direct current magnetic bias through equivalent differential electric/magnetic path principle

A single-phase transformer and DC bias technology, applied in computing, electrical digital data processing, instruments, etc., can solve problems such as complex model accuracy and low application range, to ensure safe operation, economic rationality, and solution accuracy Effects that cannot be balanced with complexity

Inactive Publication Date: 2015-05-27
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a single-phase transformer model to evaluate the transformer's ability to withstand DC bias, and to solve the shortcomings of existing models that are too complex or have low precision and can only be used in a narrow range

Method used

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  • Single-phase transformer model for calculating direct current magnetic bias through equivalent differential electric/magnetic path principle
  • Single-phase transformer model for calculating direct current magnetic bias through equivalent differential electric/magnetic path principle
  • Single-phase transformer model for calculating direct current magnetic bias through equivalent differential electric/magnetic path principle

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Embodiment Construction

[0033] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0034] 1. Based on the single-phase transformer core topology and transformer parameters, establish a circuit model

[0035] (1) The nonlinear resistance characterizes the eddy current loss of the transformer core

[0036] The magnetic flux of the transformer iron core is constantly changing, and the changing magnetic field will induce electromotive force in the iron core and generate current. These currents flow in the form of eddy currents around the magnetic flux inside the iron core, which is called eddy current. figure 2 It is a schematic diagram of the iron core lamination, and the length of the iron core lamination is l p , the thickness is d, and the cross-sectional area is A p , τ is lamination width, σ is electrical conductivity, B p is the magnetic induction intensity.

[0037] According to Bertotti theory, the instantaneous power loss of core...

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Abstract

The invention discloses a single-phase transformer model for calculating direct current magnetic bias through an equivalent differential electric / magnetic path principle. The single-phase transformer model is implemented through the following steps: a, establishing a circuit model based on a single-phase transformer iron core topological structure and transformer parameters; b, establishing a differential magnetic path model based on a differential magnetic path principle; c, deriving a relational expression among an iron core differential magnetic flux, a differential magnetomotive force, a magnetic chain and a loop differential magnetic flux based on a transformer differential magnetic path model; d, deriving a differential inductance matrix based on conclusions obtained by the steps a, b and c; e, establishing a single-phase transformer group circuit model based on a single-phase transformer winding connecting form and a differential pole matrix; f, solving a transformer differential circuit equation group based on a numerical algorithm, and solving a target variable; g, verifying the credibility of the model. According to the single-phase transformer model, the distortion degree of transformer excitation current and primary and secondary winding current during the invasion of different direct current quantities can be accurately obtained, the safe operation of an alternating current-direct current hybrid power grid is ensured, and the economic rationality of equipment selection is effectively guaranteed.

Description

technical field [0001] The invention belongs to the technical field of transformer modeling, and in particular relates to a DC bias single-phase transformer model calculated on the principle of an equivalent differential electric (magnetic) circuit. Background technique [0002] my country has a vast territory, the distribution of power generation energy and power load is extremely uneven, and the primary energy base and power load center are "reversely distributed". This objective reality determines the inevitability of my country's power flow across regions and on a large scale. Due to its obvious technical and economic advantages in long-distance, large-capacity power transmission and power system networking, high-voltage direct current transmission plays an important role in the efficient transmission of abundant hydropower, renewable energy and large-scale coal power in the west to the central and eastern regions. It has obtained large-scale planning and construction in...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 白宏坤刘永民李文峰
Owner STATE GRID CORP OF CHINA
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