An Observer-Based Harmonic Extraction Method with Front SOGI

Machines

Xiang Li¹  Maoguang Xu²  Dongyun Dai²  Yimin You²  Zhongqing Sang² 

[1] Department of Instrumental and Electrical Engineering, School of Aerospace Engineering, Xiamen University, Xiamen 361102, China;School of Electrical Engineering and Automation, Xiamen University of Technology, Xiamen 361024, China;

关键词: harmonic detection;    SOGI;    observer;    speedgoat RCP platform;   

DOI  :  10.3390/machines10020095

来源: DOAJ

【 摘 要 】

With the further development of harmonic pollution in the power system, scientists have carried out research on harmonics. Among them, harmonic detection is the first step in harmonic research. In this paper, a harmonic detection method based on an observer is proposed. This method first uses the cascaded Second-Order Generalized Integration (SOGI) algorithm, which can filter the Direct Current (DC) component of the input signal to extract the fundamental frequency, and then uses a time-varying observer to extract the harmonics. This can be used to extract harmonics from a distorted online grid signal. The effectiveness of the proposed method was evaluated on the Speedgoat Rapid Control Prototype (RCP) platform. The results show that it can complete the convergence within 0.05 s, and the standard deviation after stability will not exceed 1%.

【 授权许可】

Unknown