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A High-Robust Grid-Side Current Feedback Active Damping Design Method for Gridconnected Inverter
Ke Xu,Li Peng,Weibiao Wu,Bowei Lin,Shirong Yang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Grid-connected inverter with LCL filter is widely employed in renewable energy generation system due to high harmonic suppression ability. However, the resonance issue caused by LCL filter is brought easily. To solve this issue, grid-side current feedback active damping control strategy based on proportional derivative algorithm is employed for cost consideration. Taking digital control delay time into consideration, the active damping method is analyzed in discrete domain. A parameter design method based on dominant pole optimization is proposed, which can not only enhance damping ability but also achieve high robust performance. The validity of the proposed method is finally confirmed by the experimental results.
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Zhi-Wei Chen,Weibiao Yang,Jun LI,Qifeng Cheng,Qinlin Cai 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.20 No.5
Ordinary reinforced concrete (RC) and prestressed concrete bridges are two popular and typical types of short- and medium-span bridges that accounts for the vast majority of all existing bridges. The cost of maintaining, repairing or replacing degraded existing RC bridges is immense. Detecting the abnormality of RC bridges at an early stage and taking the protective measures in advance are effective ways to improve maintenance practices and reduce the maintenance cost. This study proposes a systematic method from influence line (IL) identification to damage detection with applications to RC bridges. An IL identification method which integrates the cubic B-spline function with Tikhonov regularization is first proposed based on the vehicle information and the corresponding moving vehicle induced bridge response time history. Subsequently, IL change is defined as a damage index for bridge damage detection, and information fusion technique that synthesizes ILs of multiple locations/sensors is used to improve the efficiency and accuracy of damage localization. Finally, the feasibility of the proposed systematic method is verified through experimental tests on a three-span continuous RC beam. The comparison suggests that the identified ILs can well match with the baseline ILs, and it demonstrates that the proposed IL identification method has a high accuracy and a great potential in engineering applications. Results in this case indicate that deflection ILs are superior than strain ILs for damage detection of RC beams, and the performance of damage localization can be significantly improved with the information fusion of multiple ILs.
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Thermal Analysis and Design of AlGaInP-based Light Emitting Diode Arrays
Zhang Ban,Zhongzhu Liang,Jingqiu Liang,Weibiao Wang,JinguangLv,Yuxin Qin 한국광학회 2017 Current Optics and Photonics Vol.1 No.2
LED arrays with pixel numbers of 3×3, 4×4, and 5×5 have been studied in this paper in order to enhancethe optical output power and decrease heat dissipation of an AlGaInP-based light emitting diode displaydevice (pixel size of 280×280 μm) fabricated by micro-opto-electro-mechanical systems. Simulation resultsshowed that the thermal resistances of the 3×3, 4×4, 5×5 arrays were 52°C/W, 69.7°C/W, and 84.3°C/W. The junction temperature was calculated by the peak wavelength shift method, which showed that themaximum value appears at the center pixel due to thermal crosstalk from neighboring pixels. The centraltemperature would be minimized with 40 μm pixel pitch and 150 μm substrate thickness as calculated bythermal modeling using finite element analysis. The modeling can be used to optimize parameters of highlyintegrated AlGaInP-based LED arrays fabricated by micro-opto-electro-mechanical systems technology.
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Gong Wenting,Niu Lijuan,Wang Chunlei,Wei Lijuan,Pan Ying,Liao Weibiao 한국식물학회 2022 Journal of Plant Biology Vol.65 No.1
Cadmium (Cd) stress can cause system disorders in plants, affect the absorption of some nutrients. The roles and their relationship of salicylic acid (SA) and hydrogen peroxide (H2O2) in adventitious root formation (ARF) of cucumber (Cucumis sativus L.) under Cd stress were studied. The results showed that the exogenous SA and H2O2 in enhancing ARF in cucumber explants under Cd stress was concentration-dependent, with an optimal biological effect at 0.1 µM SA or 50 µM H2O2. Under Cd stress, SA-induced ARF was significantly reversed by H2O2 scavenger and inhibitor, indicating that endogenous H2O2 may be involved in SA-induced ARF under Cd stress. In addition, endogenous H2O2 levels were also promoted by SA in cucumber explants. The application of SA promoted pectin content and decreased pectin methylesterification degree under Cd stress. Moreover, we founded that SA and SA + H2O2 up-regulated the expression level of CsQUA and CsPME under Cd stress, respectively. However, the application of H2O2 scavenger and inhibitor could significantly reverse the effects of SA on the expression of the above genes. These results suggested that SA might play an important role in ARF in cucumber under Cd stress via enhancing endogenous H2O2 levels.
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Behavior of Al/Cu/Ti electrodes in surface acoustic wave filter at high power
Qi Li,Sulei Fu,Zengtian Lu,Lirong Qian,Rui Wang,Tongjin Chen,Cheng Song,Fei Zeng,Weibiao Wang,Feng Pan 한국물리학회 2019 Current Applied Physics Vol.19 No.4
Driven by the need for high data-rates and continuous reduction in device size, surface acoustic wave filters are required to work under increasingly high power. In this work, a series of 2.7 GHz surface acoustic wave filters with Al/Cu/Ti three-layered electrode were fabricated and loaded with high power. Those three-layered electrodes showed weaker texture but higher stability than Al-Cu alloy electrode at high power. Morphologies, microstructures and elements distribution in cross section of fingers were analyzed carefully before and after high power loading. Results show that the circular-arc-shaped outline of fingers were appeared in most samples after high power loading, and the number of gains in the finger cross section changed from some into several with much larger volume. The features of distribution of Cu atoms also coincided with these microstructures. By finite element method and phase diagram analysis, the higher stability of Al/Cu/Ti three-layered electrodes are attributed to precipitation of θ-CuAl2 in the bottom edge of electrode finger and Cu-doped α-Al in the center top.
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