Analysis of the Three-phase Voltage Unbalance Computing Formula Used for Distribution Network

WU Jun; ZHU Jun; SHEN Haiping; FENG Yuan

doi:10.13296/j.1001-1609.hva.2019.12.031

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Analysis of the Three-phase Voltage Unbalance Computing Formula Used for Distribution Network

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- Analysis of the Three-phase Voltage Unbalance Computing Formula Used for Distribution Network
- High VoltageApparatus Vol. 55, Issue 12, Pages: 211-214(2019)
- 作者机构：
  
  1. 国家电网公司
  2. 国网无锡供电公司
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2019.12.031
  CLC： TM711
- Published：2019
- 稿件说明：
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[1]吴俊,诸军,沈海平,冯远.配电网三相不平衡度近似计算方法简析[J].高压电器,2019,55(12):211-214.

WU Jun, ZHU Jun, SHEN Haiping, et al. Analysis of the Three-phase Voltage Unbalance Computing Formula Used for Distribution Network[J]. High voltageapparatus, 2019, 55(12): 211-214.
[1]吴俊,诸军,沈海平,冯远.配电网三相不平衡度近似计算方法简析[J].高压电器,2019,55(12):211-214. DOI： 10.13296/j.1001-1609.hva.2019.12.031.

WU Jun, ZHU Jun, SHEN Haiping, et al. Analysis of the Three-phase Voltage Unbalance Computing Formula Used for Distribution Network[J]. High voltageapparatus, 2019, 55(12): 211-214. DOI： 10.13296/j.1001-1609.hva.2019.12.031.

摘要

文章分析了国家标准GB/T 15543—2008《电能质量三相不平衡度》推荐的三相不平衡度近似计算公式的来历、适用范围及其引起误差的主要影响因素。分析及算例结果表明:该近似公式适用于输电系统三相不平衡度近似计算

但在短路容量较小的配电网中采用该近似公式可能引起较大的误差;文中建议在配电网特别是短路容量较小的低压配电网电能质量规划评估中

宜采用三相不平衡度的精确计算方法。

Abstract

The three-phase voltage unbalance computing formula recommended in the national standard GB/T15543—2008 Power Quality:Three-Phase Voltage Unbalance is analyzed

including its background

applicable fields

as well as the factors resulting in error.The analysis and example illustrate that the recommended formula is more applicable to transmission system

however large error may exist if it is used for the distribution system with small short-circuit capacity.It is suggested that for power quality planning of distribution network

especially the distribution network with smaller short-circuit capacity

more precise computing formula of three-phase voltage unbalance should be used.

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