摘要
针对统一潮流控制器(UPFC)在输电线路中产生的谐波导致线路保护误动的问题,利用PSCAD软件对UPFC建立数学模型,应用快速傅里叶变换法(FFT)详细分析了UPFC安装在输电线路不同位置下的电流谐波特征,发现UPFC在线路首端时电流谐波含量最小。同时也研究了不同故障类型情况下电流的各次谐波变化特征,并用这些特征区分继电保护中线路正常与故障状态,判别故障类型和故障相的判别元件,为提出新的保护原理奠定基础。
Aiming at the transmission line protection mis- operation caused by the harmonic generated by UPFC,this paper established the mathematical model of UPFC by PSCAD software,and analyzed all kinds of current harmonic content when UPFC was installed in different locations through Fast Fourier Transform Algorithm（ FFT）.This simulation results show that the amplitudes of harmonics are the least when UPFC was installed in the head of the line. Moreover,this paper discussed the harmonic characteristic of different frequency current under the condition of different fault types. By comparing the harmonic characteristics,the fault type and fault phase can be distinguished,which provides the foundation for protection principle.
出处
《黑龙江电力》
CAS
2016年第3期218-221,共4页
Heilongjiang Electric Power
