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RISS 인기검색어
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- 저자 : Jiancheng Zhao (검색결과 5 건)
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A Novel Passivity-Based Resonant Instability Suppression Method for Grid-Connected VSC
Jiancheng Zhao,Kai Li,Xiaodong Wang,Chuan Xie,Hongbing Xu 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.1
The interaction between the three-phase voltage source converters (VSCs) and the power grid may cause high-frequency resonant instable problems. Studies have indicated that the non-passivity of VSCs is the main reason that leads to the resonances. The above-mentioned passive means that the equivalent output admittance of the VSC has a positive real part. In this paper, a novel damped Smith predictor is proposed to suppress the resonant instability problem that caused by time delay. The research proved that the proposed Smith predictor can signifi cantly improve the passivity of the VSC by reducing the width of the negative real part at the high-frequencies. Simulation and experimental results demonstrate that the proposed Smith predictor can distinctly improve the robustness of the VSC.
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Jiancheng Tu,Shusheng Wang,Geping Wu,Yun Zuo,Lei Zhao 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.10
Alloferons are a group of naturally occurringpeptides primarily isolated from insects that are capable ofstimulating mouse and human NK cell cytotoxicity towardcancer cells. In this study, we found that a modified antibacterialpeptide had a broad range of action against bothgram-positive and gram-negative bacteria. A time-courseexperiment showed that CFU counts rapidly decreasedafter ZL-2 treatment, with the bacteria nearly eliminatedwithin 4 h. We also examined the synergy between thepeptide and antibiotics. The peptide ZL-2 resulted in asignificant synergistic improvement in the potencies ofampicillin, erythromycin and ceftazidime against methicillin-resistant bacteria. In addition, ZL-2 had no detectablecytotoxicity in mouse spleen cells or a mouse animalmodel. In the mouse model by i.p. inoculation with Escherichiacoli, timely treatment of i.p. injection with ZL-2resulted in 100-fold reduction in bacteria load in blood aswell as 80 % protection from death in the inoculated animals. In conclusion, we successfully identified a modifiedpeptide with maximal bactericidal activity. This study alsoprovides a potential therapeutic for the treatment of E. colisepticemia by increasing the activity of antimicrobials.
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Improved Mutual MRAS Speed Identification Based on Back-EMF
Hong Zheng,Jiancheng Zhao,Liangzhong Liu 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.3
In the design of sensorless control system for induction motor, high-precision speed estimation is one of the most difficult problems. To solve this problem, the common method is model reference adaptive method (MRAS). MRAS requires accurate motor parameters to estimate rotor speed precisely. However, when motor is running, the variety of temperature and magnetic saturation will lead to the change of motor parameters such as stator resistance and rotor resistance, which will lower the accuracy of the speed estimation. To improve the accuracy and rapidity of speed estimation, this paper analyses the mutual MRAS speed identification based on rotor flux linkage, and proposes an improved mutual MRAS speed identification based on back-EMF. The improved method is verified by Simulink simulation and motor experimental platform based on DSP2812. The results of simulation and experiment indicate that the method proposed by this paper can significantly improve the accuracy of speed identification, and speed up the response of identification.
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Shusheng Wang,Jiancheng Tu,Cuijie Zhou,Jianwei Li,Long Huang,Lei Tao,Lei Zhao 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.2
Lfcin-B, an antimicrobial peptide found invarious exocrine secretions of mammals, showed antitumoreffects. However, the effect and relative mechanism ofLfcin-B on non-small cell lung cancer is unclear. In thisstudy, assay of cell viability, quantitative real-time PCR,Western blot, annexin V/propidium iodide assay, flowcytometry and tumor-xenograft model were applied toelucidate the mechanism of Lfcin-B on non-small cell lungcancer NCI-H460 (H460) cells. Lfcin-B significantly suppressedthe proliferation of H460 cells in vitro. Additionally,the transcription and translation of the VEGF gene inH460 cells were restrained after exposure to Lfcin-B. Moreover, the apoptosis of H460 cells was induced byLfcin-B through stimulating caspase-3, caspase-9 andpreventing survivin expression on both the transcriptionand translation level. Meanwhile, Lfcin-B increased theproduction of reactive oxygen species and suppressed theRNA of antioxidant enzymes (GPX1, GPX2, SOD3 andcatalase) in H460 cells. Finally, Lfcin-B significantly preventedthe tumor growth in the H460-bearing mice model. These results indicated that Lfcin-B could be a potentialcandidate for the treatment of lung cancer.
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Improved Mutual MRAS Speed Identification Based on Back-EMF
Zheng, Hong,Zhao, Jiancheng,Liu, Liangzhong The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.3
In the design of sensorless control system for induction motor, high-precision speed estimation is one of the most difficult problems. To solve this problem, the common method is model reference adaptive method (MRAS). MRAS requires accurate motor parameters to estimate rotor speed precisely. However, when motor is running, the variety of temperature and magnetic saturation will lead to the change of motor parameters such as stator resistance and rotor resistance, which will lower the accuracy of the speed estimation. To improve the accuracy and rapidity of speed estimation, this paper analyses the mutual MRAS speed identification based on rotor flux linkage, and proposes an improved mutual MRAS speed identification based on back-EMF. The improved method is verified by Simulink simulation and motor experimental platform based on DSP2812. The results of simulation and experiment indicate that the method proposed by this paper can significantly improve the accuracy of speed identification, and speed up the response of identification.
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