A new base-aluminum-chloride-loaded fiber[PET-AA-NN-Al_2（OH）_nCl_（6-n）]was prepared with polyethylene glycol terephthalate （PET） as adsorbent for fast removal of arsenic（Ⅴ） from water.This new fibrous adsorbe...A new base-aluminum-chloride-loaded fiber[PET-AA-NN-Al_2（OH）_nCl_（6-n）]was prepared with polyethylene glycol terephthalate （PET） as adsorbent for fast removal of arsenic（Ⅴ） from water.This new fibrous adsorbent was characterized by using SEM and C NMR spectroscopy.Adsorption kinetic curve indicated that this new fibrous adsorbent could fast remove arsenic（Ⅴ） from water, and adsorption isotherm also indicated that PET-AA-NN-A1_2（OH）_nC1_（6-n） had high equilibrium adsorption capacity for arsenic（Ⅴ）.展开更多
A new inductive motors load equivalence algorithm based on coherence is proposed in this paper. In order to partite motors load rapidly and accurately, fuzzy c-means clustering along with particle swarm optimization (...A new inductive motors load equivalence algorithm based on coherence is proposed in this paper. In order to partite motors load rapidly and accurately, fuzzy c-means clustering along with particle swarm optimization (PSO-FCM) algorithm is proposed to identify coherent motors base on its physical essence of fuzziness. The merits of PSO algorithm are independent to initial value and convergent to optimum value rapidly, and the validity function is constructed to assess clustering validity. The test on IEEE 39-Bus System is presented to evaluate the effectiveness of the new algorithm, the membership matrix definite not only coherence group of motors but also correlation value of coherence between motors. The algorithm can be used to partite motor load based on coherency in dynamic equivalence with power system operating on different modes.展开更多
This paper mainly concentrates on design of improved controller and its implementation based on single phase synchronous reference frame theory (SRFT) for Dynamic Voltage Restorer (DVR) compensating voltage sag partic...This paper mainly concentrates on design of improved controller and its implementation based on single phase synchronous reference frame theory (SRFT) for Dynamic Voltage Restorer (DVR) compensating voltage sag particularly for nonlinear load. In case of single phase distribution line with nonlinear load, the complexity of controller’s design becomes more serious issue. The present single phase and/or three phase theories applicable to DVR shows poor response to restore voltage sag in case of nonlinear load due to presence of harmonics. Hence restoration of voltage sag in single phase nonlinear load connected system has been a serious concern. Therefore, new controller for DVR has been proposed incorporating effective design concept for fundamental component extraction in case of nonlinear load. The single phase SRFT based main controller for DVR works on two separate closed path viz. feed forward path for quick transient response and feedback path for reducing the steady state error. Moreover, pre-sag mitigation strategy of DVR has been adapted through these two aforementioned paths. Complete design of proposed controller is based on phasor analysis. It also consist of proportional integral (PI) controller to reduce the error in the DC-link voltage during compensation time. The controller performance has been verified in MATLAB Simulink for both types (linear and nonlinear) of load. The results obtained indicates that the proposed controller is effective in its performance.展开更多
针对电动汽车大规模接入配电系统导致的负荷波动增大、功率损耗上升及供电质量下降等问题,提出一种基于优先级的车辆到电网(vehicle-to-grid,V2G)协调调度方法。该方法构建了以“负荷方差”“有功功率损耗降低指标(power loss reduction...针对电动汽车大规模接入配电系统导致的负荷波动增大、功率损耗上升及供电质量下降等问题,提出一种基于优先级的车辆到电网(vehicle-to-grid,V2G)协调调度方法。该方法构建了以“负荷方差”“有功功率损耗降低指标(power loss reduction,PLR)”和“无功功率损耗降低指标(power loss reduction,QLR)”为核心的多目标优化模型,并引入最有价值球员(most valuable player,MVP)算法求解,以同时实现负荷曲线平滑化与配电系统供电质量提升。设计基于SOC的优先级充放电策略,通过MVP算法搜索最优调度方案,并与GA、ABC、PSO、CSO、OCSO等多种元启发式算法进行对比。结果表明:所提出方法能够显著降低负荷波动,PLR和QLR的最小化效果均优于对比算法,功率损耗降低幅度最高可达29.20%,计算效率亦具有明显优势。基于IEEE 69节点径向配电系统的仿真验证了该方法的有效性和鲁棒性,证明该方法能够为电动汽车有序用电规划提供更合理的非支配解集,为后续实时调度及可再生能源接入提供较为重要参考。展开更多
A Mobile Offshore Base (MOB) is a multi-purpose logistics base, which can be stationed in coastal or international waters. In the conceptual design of the MOB, attention should he paid to the dynamic responses of the ...A Mobile Offshore Base (MOB) is a multi-purpose logistics base, which can be stationed in coastal or international waters. In the conceptual design of the MOB, attention should he paid to the dynamic responses of the inter-module connectors because tremendous loads occur in the connectors. In this paper, a study on dynamic responses of the MOB connectors is carried out by use of the Rigid Module Flexible Connector (RMFC) model which assumes that the module stiffness is significantly larger than that of the connector. In the analysis, the connector is modeled as a linear spring, which restricts relative translations but allows for relative rotations of modules. The 3-D source distribution method is adopted to determine the hydrodynamic forces of the modules, and the hydrodynamic interaction between modules is taken into account. The module motions and connector loads for 12 connector stiffness cases in regular and irregular waves are calculated with the multi-rigid-body motion equations. And the calculated results are compared with those from relative references. It is shown that the results obtained by different methods are in good agreement.展开更多
基金support provided by the National Science Funds for Young Scientists(No.51008152)
文摘A new base-aluminum-chloride-loaded fiber[PET-AA-NN-Al_2（OH）_nCl_（6-n）]was prepared with polyethylene glycol terephthalate （PET） as adsorbent for fast removal of arsenic（Ⅴ） from water.This new fibrous adsorbent was characterized by using SEM and C NMR spectroscopy.Adsorption kinetic curve indicated that this new fibrous adsorbent could fast remove arsenic（Ⅴ） from water, and adsorption isotherm also indicated that PET-AA-NN-A1_2（OH）_nC1_（6-n） had high equilibrium adsorption capacity for arsenic（Ⅴ）.
文摘A new inductive motors load equivalence algorithm based on coherence is proposed in this paper. In order to partite motors load rapidly and accurately, fuzzy c-means clustering along with particle swarm optimization (PSO-FCM) algorithm is proposed to identify coherent motors base on its physical essence of fuzziness. The merits of PSO algorithm are independent to initial value and convergent to optimum value rapidly, and the validity function is constructed to assess clustering validity. The test on IEEE 39-Bus System is presented to evaluate the effectiveness of the new algorithm, the membership matrix definite not only coherence group of motors but also correlation value of coherence between motors. The algorithm can be used to partite motor load based on coherency in dynamic equivalence with power system operating on different modes.
基金Acknowledgments This work has benefited from the use of 1） Los Alamos Neutron Science Facility at Los Alamos National Laboratory and 2） ISIS Pulsed Neutron and Muon Source at Rutherford-Appleton Laboratory. The financial support of the National Science Foundation＇s 1） International Materials Institutes （IMI） under DMR-0231320, 2） Integrative Graduate Education and Research Training （IGERT） under DGE-9987548, 3） Combined Research and Curriculum Development （CRCD） under EEC-9527527 and EEC-0203415, and 4） Major Research Instrumentation （MRI） under DMR-0231320 at the University of Tennessee with Dr HUBER C, Dr Van HARTESVELDT C J, Dr DUTTA D, Dr JENNINGS W, Dr G0LDBERG L, Ms P0ATS M, and Dr B0ULDIN C R as the Program Directors, is greatly appreciated. Additional funding for this project was gratefully received from the Tennessee Advanced Materials Laboratory, with Prof. PLUMMER E W as the Director.
文摘This paper mainly concentrates on design of improved controller and its implementation based on single phase synchronous reference frame theory (SRFT) for Dynamic Voltage Restorer (DVR) compensating voltage sag particularly for nonlinear load. In case of single phase distribution line with nonlinear load, the complexity of controller’s design becomes more serious issue. The present single phase and/or three phase theories applicable to DVR shows poor response to restore voltage sag in case of nonlinear load due to presence of harmonics. Hence restoration of voltage sag in single phase nonlinear load connected system has been a serious concern. Therefore, new controller for DVR has been proposed incorporating effective design concept for fundamental component extraction in case of nonlinear load. The single phase SRFT based main controller for DVR works on two separate closed path viz. feed forward path for quick transient response and feedback path for reducing the steady state error. Moreover, pre-sag mitigation strategy of DVR has been adapted through these two aforementioned paths. Complete design of proposed controller is based on phasor analysis. It also consist of proportional integral (PI) controller to reduce the error in the DC-link voltage during compensation time. The controller performance has been verified in MATLAB Simulink for both types (linear and nonlinear) of load. The results obtained indicates that the proposed controller is effective in its performance.
文摘针对电动汽车大规模接入配电系统导致的负荷波动增大、功率损耗上升及供电质量下降等问题,提出一种基于优先级的车辆到电网(vehicle-to-grid,V2G)协调调度方法。该方法构建了以“负荷方差”“有功功率损耗降低指标(power loss reduction,PLR)”和“无功功率损耗降低指标(power loss reduction,QLR)”为核心的多目标优化模型,并引入最有价值球员(most valuable player,MVP)算法求解,以同时实现负荷曲线平滑化与配电系统供电质量提升。设计基于SOC的优先级充放电策略,通过MVP算法搜索最优调度方案,并与GA、ABC、PSO、CSO、OCSO等多种元启发式算法进行对比。结果表明:所提出方法能够显著降低负荷波动,PLR和QLR的最小化效果均优于对比算法,功率损耗降低幅度最高可达29.20%,计算效率亦具有明显优势。基于IEEE 69节点径向配电系统的仿真验证了该方法的有效性和鲁棒性,证明该方法能够为电动汽车有序用电规划提供更合理的非支配解集,为后续实时调度及可再生能源接入提供较为重要参考。
基金This work was finarcially supported by the National Natural Science Foundation of China(Grant No.50039016)
文摘A Mobile Offshore Base (MOB) is a multi-purpose logistics base, which can be stationed in coastal or international waters. In the conceptual design of the MOB, attention should he paid to the dynamic responses of the inter-module connectors because tremendous loads occur in the connectors. In this paper, a study on dynamic responses of the MOB connectors is carried out by use of the Rigid Module Flexible Connector (RMFC) model which assumes that the module stiffness is significantly larger than that of the connector. In the analysis, the connector is modeled as a linear spring, which restricts relative translations but allows for relative rotations of modules. The 3-D source distribution method is adopted to determine the hydrodynamic forces of the modules, and the hydrodynamic interaction between modules is taken into account. The module motions and connector loads for 12 connector stiffness cases in regular and irregular waves are calculated with the multi-rigid-body motion equations. And the calculated results are compared with those from relative references. It is shown that the results obtained by different methods are in good agreement.
