摘要
从集成电路设计的角度,提出了一种基于非均匀同步过采样技术的谐波测量算法。通过合理设计过采样和降采样2个阶段中非均匀采样时钟频率的概率分布函数,使得频域的非均匀采样噪声可以被忽略。降采样得到的数据可以视为均匀同步采样的结果直接采用快速傅里叶变换进行分析,降低了对分析过程运算能力的要求。利用采样时钟的非均匀特性,大幅简化了延时锁定环路时钟产生电路的复杂度,降低了电路实现代价。仿真结果显示,算法大幅提高了谐波测量的精度。
A harmonics measurement algorithm based on the non-uniform synchronized oversampling is proposed from integrated circuit design perspective.A probability distribution function of sampling clock frequency at oversampling and down-sampling stages is designed to minimize the impact of non-uniform sampling noise.The final down-sampled data can be treated as uniformly sampled and synchronized data.Thus fast Fourier transform can be directly applied.No extra work of computing is needed.The non-uniform property of the sampling clock simplifies the delay locked loop circuit.Precision improvement of harmonics measurement can be identified by the simulation results.
出处
《电力系统自动化》
EI
CSCD
北大核心
2013年第7期102-107,共6页
Automation of Electric Power Systems
关键词
非均匀同步过采样
延时锁定环路
概率分布函数
谐波测量
硬件实现
non-uniform synchronized oversampling
delay locked loop
probability distribution function
harmonics measurement
hardware implement
