DC Bias Calculation and Characteristics Analysis of Reactive Power for the UHV Transformer

WANG Zezhong; TAN Ruijuan; LIU Lianguang; DENG Tao

doi:10.13296/j.1001-1609.hva.2017.02.016

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DC Bias Calculation and Characteristics Analysis of Reactive Power for the UHV Transformer

更新时间：2025-04-26

- DC Bias Calculation and Characteristics Analysis of Reactive Power for the UHV Transformer
- High VoltageApparatus Vol. 53, Issue 2, Pages: 101-107(2017)
- 作者机构：
  
  1. 华北电力大学高电压与电磁兼容北京市重点实验室
  2. 华北电力大学新能源电力系统国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2017.02.016
  CLC： TM41
- Published：2017
- 稿件说明：
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[1]王泽忠,谭瑞娟,刘连光,邓涛.特高压变压器直流偏磁计算及无功功率特性分析[J].高压电器,2017,53(02):101-107.

WANG Zezhong, TAN Ruijuan, LIU Lianguang, et al. DC Bias Calculation and Characteristics Analysis of Reactive Power for the UHV Transformer[J]. High voltageapparatus, 2017, 53(2): 101-107.
[1]王泽忠,谭瑞娟,刘连光,邓涛.特高压变压器直流偏磁计算及无功功率特性分析[J].高压电器,2017,53(02):101-107. DOI： 10.13296/j.1001-1609.hva.2017.02.016.

WANG Zezhong, TAN Ruijuan, LIU Lianguang, et al. DC Bias Calculation and Characteristics Analysis of Reactive Power for the UHV Transformer[J]. High voltageapparatus, 2017, 53(2): 101-107. DOI： 10.13296/j.1001-1609.hva.2017.02.016.

摘要

针对变压器的直流偏磁问题

分析了特高压变压器直流偏磁时无功损耗的响应机理

给出无功损耗计算方法

进行无功损耗特性分析。采用增加串联电阻的方法

提高计算电流中直流分量的计算精度。结合电压补偿

消除增加串联电阻后导致的电压下降问题。根据特高压变压器的实际参数

建立变压器的场路耦合模型

进行特高压变压器不同直流偏磁电流下的仿真计算。研究表明

变压器直流偏磁时

励磁电流波形严重畸变。随着直流偏磁电流的增加

特高压变压器的空载无功功率逐渐增加

直流偏磁电流超过一定范围后

无功功率随着直流偏磁电流的增加近似呈线性增加。相同直流偏磁电流时

负载下的无功功率明显大于空载下的无功功率。相比于无直流偏磁时的无功功率

相同直流偏磁电流时

空载与负载下的无功增额大体相同。

Abstract

For the DC bias problem of transformer

the response mechanism of reactive power loss of UHV transformer under DC bias is analyzed and the method of reactive power loss is indicated. On the basis of this

when given no power loss calculation method

the characteristics of reactive power loss is analyzed. The efficiency about the calculated current can be enhanced by increasing the series resistance. The problem of voltage drop can be solved effectively resulting in the series resistance by the method of voltage compensation. The magnetic field model is established according to the product level of UHV transformer parameters. The time domain simulations of different direct current can be carried out based on the field-circuit coupled model

established according to the product level of UHV transformer parameters.The study shows that the exciting current is distorted wave severely. The reactive power loss in no-load increase linearly with DC current grows. Compared to the no-load

the reactive power loss with load increases more with the same DC bias current. In addition

with the same DC bias current

the increase of reactive power loss is nearly the same in no-load and load.

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