一种用于大规模新能源场站的谐波阻抗扫描方法  

A Harmonic Impedance Scanning Method for Large-Scale New Energy Stations

作　　者：常宝立[1] 葛景 王仙荣 刘永刚[1] 罗皓 CHANG Baoli;GE Jing;WANG Xianrong;LIU Yonggang;LUO Hao(NR Electric Co.,Ltd.,Nanjing Jiangsu 211102,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102

出　　处：《湖北电力》2024年第4期85-94,共10页Hubei Electric Power

基　　金：国家重点研发项目(项目编号:2023YFB2405900)。

摘　　要：随着新能源装机容量的提升,使得系统面临宽频振荡的风险。阻抗分析法是新能源宽频振荡研究的通用方法,场站和主电网的谐波阻抗是该方法的关键参数。基于电磁暂态仿真软件,通过测试信号法可获得小规模新能源场站的谐波阻抗,但对于大规模厂站,需通过聚合、倍乘等方法进行建模,影响了结果的准确性。对此,以单台新能源机组测试信号法的结果作为单机的谐波阻抗模型,进一步设计了电缆、变压器、滤波器等元件的谐波阻抗模型,研究了大规模电网谐波阻抗扫描的高效计算方法,开发了对应的软件,采用BPA格式的数据,可搭建大规模的新能源场站,扫描场站内的各种运行工况下的谐波阻抗,并以典型的风电场为例,分析了机组不同出力、风场不同开断方式下谐波阻抗的变化。With the increase in the installed capacity of new energy,the power system is facing the risk of broadband oscillation.Impedance analysis is a universal method for studying broadband oscillations in new energy,and the harmonic impedance of the new energy station and main system is the key parameter of the method.Based on electromagnetic transient simulation software,the harmonic impedance of small-scale new energy stations can be obtained through the test signal method.However,for large-scale stations,modeling needs to be done through aggregation,multiplication,and other methods,which affects the accuracy of the results.In response to this,this paper takes the test results of signal method for a single new energy unit as a single machine harmonic impedance model to design the harmonic impedance models of cable,transformer,filter and other elements.Then,the paper makes studies on the efficient calculation method of harmonic impedance scanning in large-scale power grid,with the corresponding software developed.The data in BPA format can be used to build large-scale new energy stations and scan the harmonic impedance of various operating conditions in the station.Finally,taking a typical wind farm as an example,the paper analyzes the harmonic impedance changes under different unit output and different disconnection modes of the wind farm.

关 键 词：谐波阻抗 新能源场站 阻抗扫描 宽频振荡 测试信号法 电缆模型 

分 类 号：TM712[电气工程—电力系统及自动化]