Page 22 - 电力与能源2023年第四期

第 44 卷 第 4 期
电力与能源
328 2023 年 8 月

DOI：10.11973/dlyny202304004
电网技术

基于变异系数特征的配电网谐波责任评估方法

吴 迪，秦陈键，颜昕昱
（国网上海市电力公司市北供电公司，上海 200007）

摘 要：随着大量分布式新能源和电力电子设备并入配电网，系统谐波污染问题愈发严重，判别用户与系统在
公共耦合点（PCC）处的谐波责任是谐波治理的重要前提。分布式新能源逆变系统的等效输出谐波阻抗非远
大于系统谐波阻抗，导致已有谐波责任评估方法精度降低甚至失效。针对此问题，提出了一种基于系统谐波
阻抗变异系数特征的配电网谐波责任评估方法。为了精准表征稳定运行状态下系统谐波阻抗波动的平缓特
性，采用了变异系数来衡量系统侧谐波阻抗的波动程度，并以变异系数最小为目标建立了最优化模型；进而通
过粒子群算法求解该模型从而获得系统侧谐波电压并进一步计算出系统谐波阻抗值，以实现该测量周期内
PCC 处谐波责任的量化区分。通过诺顿等效电路模型、三馈线模型、分布式新能源并网模型等 3 种场景验证
了所提方法的有效性。
关键词：电能质量；谐波责任评估；系统谐波阻抗估计；变异系数；新能源并网
作者简介：吴 迪（1995—），男，助理工程师，主要从事配电网电能质量分析与治理以及电网资产管理工作。
中图分类号：TM76 文献标志码：A 文章编号：2095-1256（2023）04-0328-07
Harmonic Responsibility Evaluation Method for Distribution Network Based on

Variation Coefficient Characteristics

WU Di，QIN Chenjian，YAN Xinyu

（State Grid Shibei Power Supply Company，SMEPC，Shanghai 200007，China）

Abstract：As a large amount of distributed new energy and power electronic equipment were integrated into the
distribution network，the harmonic pollution of the system was becoming more and more serious. It was an impor⁃

tant premise to judge the harmonic responsibility between the user and the system at the point of common coupling
（PCC） The equivalent output harmonic impedance of distributed new energy inverter system was not much
.
larger than the system harmonic impedance，resulting in the accuracy of existing harmonic responsibility assess⁃

ment methods be less accurate or even ineffective. Therefore，a harmonic responsibility evaluation method of dis⁃

tribution network based on the characteristics of harmonic impedance variation coefficient was proposed. In order
to accurately characterize the smooth fluctuation characteristics of the harmonic impedance of the system under

stable operation，variation coefficient was used to measure the fluctuation degree of the harmonic impedance of
the system side，and the optimization model was established with the minimum variation coefficient as the objec⁃

tive. Then particle swarm optimization algorithm was used to solve the model to obtain the harmonic voltage of

the system side and calculate the harmonic impedance of the system，so as to realize the quantification of the har⁃

monic responsibility at the PCC within the measurement period. Three scenarios，such as the distributed new en⁃
ergy grid connection model，were used to verify the effectiveness of the proposed method.

Key words：power quality，harmonic responsibility evaluation，system harmonic impedance estimation，variation

coefficient，new energy grid connection
［1］
为了提高清洁能源利用率、降低碳排放等工 电网，令系统谐波污染问题愈发严重 。电力谐
业污染、打造绿色生态文明城市，近年来上海致力 波会影响园区内高新企业精密设备的功能甚至烧
于老旧工业园区的转型与高新技术园区的建设， 毁设备 ，从而造成较大损失，因此谐波污染问题
［2］
这使得大量分布式新能源与电力电子设备并入配 亟待解决。无论是国际遵循的“奖惩性”谐波治理