摘要
将Prony算法应用于谐波与间谐波检测时,存在采样参数及模型阶数难以确定的问题;另外由于现代电网谐波与间谐波频率范围广,直接进行Prony分析的辨识结果往往不精确。针对这些问题提出了一种分段Prony算法,首先依据信噪比和均方差来确定模型阶数;然后根据谐波与间谐波的频率范围进行频段划分,确定各频段的采样频率及采样时间;最后根据各段采样参数进行分段Prony分析,并综合各段分析结果,得出各频段谐波与间谐波的频率、幅值、衰减因子及初相位。仿真算例验证了该算法的有效性。
When Prony algorithm is applied to the detection of harmonics and inter-harmonics, the sampling parameters and the order of the model are difficult to decide; besides, due to the wide ranges of harmonic and inter-harmonic frequencies in modem power grids the recognition results by direct Prony analysis are often inaccurate. To solve these problems, a segmentation Prony algorithm is proposed. Firstly, the proposed method divides frequency bands according to frequency ranges of harmonics and inter-harmonics to determine the sampling frequencies and sampling times of various frequency bands; then based on signal to noise ratio and mean square deviation, the order of the model is determined; finalty in accordance with sampling parameters of all segments the Prony analysis is carried out, and then the frequencies, amplitudes, attenuation factors and initial phases of all harmonics and inter-harmonics are obtained. The effectiveness of the proposed algorithm is verified by simulation results.
出处
《电网技术》
EI
CSCD
北大核心
2010年第3期21-25,共5页
Power System Technology
基金
"十一五"国家科技支撑计划重点项目(2007BAA12B5)
铁道部重点科研项目(Z2006-047)~~
关键词
谐波
间谐波
PRONY算法
采样
分段
harmonics
inter-harmonics
Prony algorithm
sampling
segmentation
