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Dynamic Synchronous Phasor Measurement Algorithm Based on Compressed Sensing
( Huanan Yu ),( Yongxin Li ),( Yao Du ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.1
The synchronous phasor measurement algorithm is the core content of the phasor measurement unit. This manuscript proposes a dynamic synchronous phasor measurement algorithm based on compressed sensing theory. First, a dynamic signal model based on the Taylor series was established. The dynamic power signal was preprocessed using a least mean square error adaptive filter to eliminate interference from noise and harmonic components. A Chirplet overcomplete dictionary was then designed to realize a sparse representation. A reduction of the signal dimension was next achieved using a Gaussian observation matrix. Finally, the improved orthogonal matching pursuit algorithm was used to realize the sparse decomposition of the signal to be detected, the amplitude and phase of the original power signal were estimated according to the best matching atomic parameters, and the total vector error index was used for an error evaluation. Chroma 61511 was used for the output of various signals, the simulation results of which show that the proposed algorithm cannot only effectively filter out interference signals, it also achieves a better dynamic response performance and stability compared with a traditional DFT algorithm and the improved DFT synchronous phasor measurement algorithm, and the phasor measurement accuracy of the signal is greatly improved. In practical applications, the hardware costs of the system can be further reduced.
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Anguo Ying,Zhifeng Li,Yuxiang Ni,Songlin Xu,Hailiang Hou,Huanan Hu 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
Four novel multiple-acidic ionic liquids based on triethanolamine (TEA) were prepared and used as efficient catalysts to synthesize bis-indolylmethanes at room temperature without any organic solvent. [TEOA][HSO4] showed the best catalytic performance. The optimal amount of catalyst was 10 mol%. Various aldehydes/ketones reacted with indole/substituted indole smoothly and afforded to corresponding products in 70–99% yields within minutes. Additionally, the ionic liquid could be reused up to five times with only a slight decrease in catalytic activity. Finally, a possible reaction mechanism was given. Techniques of acidity test and NMR were introduced to verify the proposed mechanism.
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Feature of vortex core gyration affected by Dzyaloshinskii-Moriya interaction
Wei Maobin,Hu Yue,Wu Chengcheng,Sui Yingrui,Li Huanan 한국물리학회 2023 Current Applied Physics Vol.46 No.-
The effects of Dzyaloshinskii-Moriya interaction (DMI) on vortex core gyration excited by an out-of-plane polarized current is investigated through micromagnetic simulation. The simulation results demonstrate that the DMI not only widens the current density range for gyration, but also greatly increases the frequency and velocity of gyration. On the premise that DMI is large enough and the vortex configurations can simultaneously be maintained, the stable gyration orbit changes from a circle, to a ring-like and to a bird-nest-like trajectory. Furthermore, by comparing the data of different-size nanodisks, it can be seen that the vortices in smaller and thinner disks can achieve higher velocity and larger amplitude gyration, while in larger and thicker disks, the magnetic vortices can obtain higher oscillation frequency. The conclusions in this research add to the potential applications of magnetic vortex in nano-oscillaors.
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