An Improved Algorithm for Harmonic Current Detection
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摘要: 针对基于瞬时无功功率理论的谐波检测算法实时性差、不能直接用于单相谐波检测的问题,提出采用滑窗迭代DFT算法来提高谐波检测的实时性;并针对传统DFT在非同步抽样时存在错误的问题,提出采用自适应抽样算法来自动调整抽样时间,从而减小DFT在非同步抽样时的计算误差。仿真结果表明,基于自适应抽样的滑窗迭代DFT算法能够实时有效地检测出谐波电流,具有很好的目标跟随性和抗干扰性。Abstract: In order to solve problems that harmonic detecting algorithm based on instantaneous reactive power theory is poor in real-time performance and cannot detect single-phase harmonic directly, the paper proposed using a sliding-window iterative DFT algorithm to improve real-time performance of harmonic detection, and using self-adaptive sampling algorithm to adjust sampling time automatically so as to decrease calculating errors of FDT in non-synchronous sampling. The simulation result showed that the sliding-window iterative DFT algorithm based on self-adaptive sampling can detect harmonic current real-timely and effectively, and has excellent performances of target following and anti-interference.
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