高比例新能源电网下的光伏电站谐波分析与治理  

Harmonic Analysis and Treatment of Photovoltaic Power Plants under High Ratio New Energy Grid

作　　者：张后谊 古庭赟 高吉普 徐玉韬 李博文 张缘圆 ZHANG Houyi;GU Tingyun;GAO JIpu;XU Yutao;LI Bowen;ZHANG Yuanyuan(Electric Power Research Institute of Guizhou Power Grid Co.,Lud.,Guiyang 550002,Guizhou,China)

机构地区：[1]贵州电网有限责任公司电力科学研究院,贵州贵阳550002

出　　处：《电力大数据》2022年第8期20-28,共9页Power Systems and Big Data

基　　金：贵州省科技计划项目(批准号:黔科合支撑[2022]一般013)。

摘　　要：大规模新能源接入电网带来高频次、宽频域等特性的谐波,对电力系统的可靠运行与新能源消纳带来挑战。为分析新能源电网与光伏电站之间的谐波交互作用,实现新能源电网下光伏电站谐波的有效治理,本文首先分析了光伏电站逆变器特征谐波的变化规律,将谐波源和站内逆变器功率模型叠加建立谐波模型,并基于DIGSILENT建立光伏电站整场站功率模型和谐波模型。然后进行谐波潮流计算得到光伏电站的谐波分布及渗透到上级电网的谐波,上级电网背景谐波叠加渗透谐波得到上级电网的实际谐波,由此可得光伏电站谐波分布及上级电网谐波含有率,进而给出光伏电站SVG的滤波容量建议。最后,以某光伏电站为例,仿真分析其谐波输出,验证所建立模型有效性及正确性。As large-scale new energy sources are connected to the power grid,the harmonics of the power grid have the characteristics of high frequency and wide frequency domain.This brings challenges to the reliable operation of the power system and new energy consumption.In order to analyze the harmonic interaction between the new energy grid and the photovoltaic power station,realize the effective control of the harmonics of the photovoltaic power station under the new energy grid,this paper first analyzes the variation law of the characteristic harmonics of the photovoltaic power station inverte.Based on DIGSILENT,the power model and harmonic model of the whole photovoltaic power station are established.According to the harmonic characteristics of the inverter,the harmonic model is established on the basis of the power models of each inverter in the photovoltaic power station by superposition of harmonic sources.Then,the harmonic power flow calculation is carried out on the DIGSILENT platform to obtain the harmonic distribution of the photovoltaic power station and the harmonics that penetrate into the superior power grid.The actual harmonic of the superior power grid is obtained by superimposing the background harmonic of the superior power grid with the seepage harmonic.According to the harmonic distribution of the photovoltaic power station and the harmonic content of the superior power grid,the filtering capacity of the photovoltaic power station SVG is given.Finally,the simulation analysis of the harmonic output of a photovoltaic power station is carried out to verify the validity and correctness of the established model.

关 键 词：光伏电站 交互作用 谐波分析 系统仿真 谐波治理 

分 类 号：TM615[电气工程—电力系统及自动化]