基于电力系统ATP仿真模型的谐波分析  

Harmonic analysis with high accuracy based on ATP simulation model of power system

作　　者：胡振华[1] 孙树平[1] 王海滨[1] 陈蓉芳[1] 陈洁[1] 

机构地区：[1]西华大学电气信息学院,成都610039

出　　处：《电测与仪表》2008年第8期15-20,共6页Electrical Measurement & Instrumentation

基　　金：四川省教育厅自然基金重点资助项目(2004A116)

摘　　要：为了减少非同步采样对快速傅立叶变换的影响,提高电力系统谐波分析的精度,本文详细介绍了一种基于四项Blackman-Harris窗插值FFT算法的谐波参数估计方法,并推导了其谐波参数估计公式,然后利用电磁暂态仿真程序ATP建立一个实际的400/33kV工业电力系统的仿真模型,对该系统的谐波电流进行了仿真,最后针对不同程度的频谱泄漏,采用FFT和四项Blackman-Harris窗插值FFT两种算法对谐波电流的16次谐波参数估计值进行对比分析。实验结果表明,在相同条件下,该算法较FFT算法在频率、幅值和相位的估计值精度上有明显提高。In order to reduce the influence of an unsynchronized sample sequence on FFT and to improve the precision of harmonic in power system, a harmonic estimation based on interpolation FFT algorithm is proposed. The estimation algorithm based on four coefficients of Blackman-Harris window is discussed in detail and estimating formulas of harmonic parameter are deduced in this paper. A real industrial 400/33 kV power system simulation model is established using the ATP （the alternative transients program）, and harmonic current in this system is simulated. Considering current is analyzed using FFT algorithm varying degrees of spectrum leakage, harmonic directly and Blackman-Harris window with four coefficients interpolation FFT algorithm, and 12 harmonics parameters are calculated. Finally, the simulation results of the two algorithms are analyzed and compared. The simulating result demonstrates that the estimation harmonic frequency, amplitude and phase are highly accurate using the improved algorithm for the unsynchronized sample sequence analysis.

关 键 词：电力系统 谐波分析 快速傅里叶变换 非同步采样 四项Blackman—Harris窗 插值FFT算法 ATP 

分 类 号：TM74[电气工程—电力系统及自动化]