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Application of a C-Type Filter Based LCFL Output Filter to Shunt Active Power Filters
Cong Liu,Ke Dai,Kewei Duan,Yong Kang 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.6
This paper proposes and designs a new output filter called an LCFL filter for application to three phase three wire shunt active power filters (SAPF). This LCFL filter is derived from a traditional LCL filter by replacing its capacitor with a C-type filter, and then constructing an L-C-type Filter-L (LCFL) topology. The LCFL filter can provide better switching ripple attenuation capability than traditional passive damped LCL filters. The LC branch series resonant frequency of the LCFL filter is set at the switching frequency, which can bypass most of the switching harmonic current generated by a SAPF converter. As a result, the power losses in the damping resistor of the LCFL filter can be reduced when compared to traditional passive damped LCL filters. The principle and parameter design of the LCFL filter are presented in this paper, as well as a comparison to traditional passive damped LCL filters. Simulation and experimental results are presented to validate the theoretical analyses and effectiveness of the LCFL filter.
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Application of a C-Type Filter Based LCFL Output Filter to Shunt Active Power Filters
Liu, Cong,Dai, Ke,Duan, Kewei,Kang, Yong The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.6
This paper proposes and designs a new output filter called an LCFL filter for application to three phase three wire shunt active power filters (SAPF). This LCFL filter is derived from a traditional LCL filter by replacing its capacitor with a C-type filter, and then constructing an L-C-type Filter-L (LCFL) topology. The LCFL filter can provide better switching ripple attenuation capability than traditional passive damped LCL filters. The LC branch series resonant frequency of the LCFL filter is set at the switching frequency, which can bypass most of the switching harmonic current generated by a SAPF converter. As a result, the power losses in the damping resistor of the LCFL filter can be reduced when compared to traditional passive damped LCL filters. The principle and parameter design of the LCFL filter are presented in this paper, as well as a comparison to traditional passive damped LCL filters. Simulation and experimental results are presented to validate the theoretical analyses and effectiveness of the LCFL filter.
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Microfluidic step emulsification techniques based on spontaneous transformation mechanism: A review
Ziwei Liu,Cong Duan,Shaokun Jiang,Chunying Zhu,Youguang Ma,Taotao Fu 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.92 No.-
Rapid and robust generation of uniformly sized droplets is a research hotspot for emulsificationtechnology. Compared with conventional microfluidic devices such as cross-junction andflow-focusing,the size of the droplets generated in the step emulsifiers based on the spontaneous transformationmechanism is independent of theflowfluctuation, making this type of devices have many advantagesand important application value. To introduce the research progress of step emulsification technology inrecent years, this review discusses the device configurations, interfacial evolution for droplet formationmechanism,flow pattern classification, the influence of control variables on the emulsification processand the application advantages of such devices, and illustrates the design and selection principles of suchdevices, the control laws of manipulation variables, and the future applicationfields and directions.
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Mengchen Mao,Yufei Tang,Kang Zhao,Zihao Duan,Cong Wu 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.2
Porous titanium scaffolds with aligned lamellar pore channels and smooth inner walls were fabricated by directional freezecasting using aqueous TiH2slurries. The formation of dendrites was inhibited by increasing the TiH2content in slurry. Thepore structures and compression strengths of porous titanium scaffolds that were made with different solid contents werecharacterized. The formation mechanism of aligned lamellar pore channels and the reason for the improvement of compressionstrength were analyzed. With increasing TiH2content in slurry, the open porosity reduced from 38.57 to 29.03% whilelamellar spacing decreased. Young’s modulus was decreased with the increasing open porosity. Directional lamellar porechannels were obtained by controlling the TiH2content in slurry, which can reduce the number of branches and preventstress concentrations during compression. Also, the porous titanium scaffolds prepared by this process had a good biocompatibilitywith osteoblasts.
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Exotic Magnetism of s-electron Cluster Arrays: Ferromagnetism, Ferrimagnetism and Antiferromagnetism
Takehito Nakano,Duong Thi Hanh,Yasuo Nozue,Nguyen Hoang Nam,Truong Cong Duan,Shingo Araki 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Alkali metal nanoclusters can be stabilized in the regular cages of zeolite crystals by the loading ofguest alkali metals. Cages are connected by the sharing of windows of the framework, and arrayed insimple cubic, diamond and body centered cubic structures in zeolites A, X and sodalite, respectively. The s-electrons have the localized nature of nanoclusters with magnetic moments, and have mutualinteractions through the windows of cages. They show exotic magnetism depending on the structuretype of zeolites, the kind of alkali metals and the average loading density of alkali atoms per cage. In zeolite A, potassium clusters are formed in α-cages that have an inside diameter of 11 °A. Theyexhibit ferromagnetic properties explained by the canted antiferromagnetism of the Mott insulator,where the 1p-like degenerate orbitals of clusters play an essential role in the magnetic properties. Na-K alloy clusters generated at supercages and β-cages of low-silica X (LSX) zeolite exhibit N´eel’sN-type ferrimagnetism at specific loading densities of alkali metals. Alkali metal clusters in sodaliteshow the ideal Heisenberg antiferromagnetism of the Mott insulator.
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