摘要：
Whistler mode wave is a crucial emission which can significantly affect the electron dynamics in the magnetosphere. The nonlinear three-wave interaction between whistler mode waves has been frequently observed, while the four-wave interaction between these waves is seldom reported. Here, we present two multiband whistler mode wave events by Van Allen Probes, in which the relatively weak wave bands occur exactly corresponding to the strong wave bands. We find that the frequencies of the weak and strong bands satisfy the frequency matching conditions of the four-wave interaction, and the wave normal angles of the weak bands are almost within the possible ranges calculated from the wave vector matching conditions. Additionally, the cross-correlation coefficients between the amplitudes of the weak bands and that of strong bands approach 0.80. These results indicate that the weak bands are very likely to be produced by the four-wave interaction between whistler mode waves. Similar to the three-wave interaction, the four-wave interaction can extend the frequency of whistler mode waves from close to 0.5fce to a wider range in both the lower (0.26fce) and upper (0.78fce) bands, and thus potentially play an important role in the electron dynamics.
Two multiband whistler mode wave events are reported in which relatively weak wave bands occur exactly corresponding to the strong bands
Frequency and wave vector matching conditions of the four-wave interaction are found to be satiated in both events
Four-wave interactions between whistler mode waves can cause the frequency broadening, potentially affecting the electron dynamics
作者机构：
[罗隆福; 曹一家; 李勇] School of Electrical and Information Engineering, Hunan University, Changsha, 410082, China;[Zeng X.; 喻锟] School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha, 410114, China;[侯亮] CYG SUNRI Co., Ltd., Shenzhen, 518057, China;[谢李为] School of Electrical and Information Engineering, Hunan University, Changsha, 410082, China, School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha, 410114, China
通讯机构：
[Li, Y.] S;School of Electrical and Information Engineering, China
摘要：
Due to the widespread use of renewable energy sources, lithium-ion batteries have developed rapidly because renewable energy sources, such as photovoltaics and wind, which are very much affected by the environment and their power output can be better leveled if lithium-ion batteries are used. Battery state of charge (SOC) characterizes the remaining battery power, while battery state of health (SOH) characterizes the battery life state, and they are key parameters to characterize the state of lithium-ion batteries. In terms of battery SOC estimation, this paper optimizes the extended Kalman filtering (EKF) algorithm weights to adjust the weights during high current bursts to obtain better SOC tracking performance and optimizes the back propagation (BP) neural network for SOH estimation to obtain better weights to further obtain more accurate battery SOH. The feasibility of the optimized algorithm is validated by the experimental platform.
作者：
Liu Jiyang;Sun Chenhao*;Xu Zhuoran;Liu Yanzheng;Sun Zhengjie;...
期刊：
International Journal of Emerging Electric Power Systems,2023年:- ISSN：2194-5756
通讯作者：
Sun Chenhao
作者机构：
[Liu Jiyang; Sun Chenhao; Xu Zhuoran; Liu Yanzheng; Sun Zhengjie] School of Electrical & Information Engineering, Changsha University of Science & Technology, Changsha, 410114, China;[Wang Shiqin] CRRC Institute CO.LTD, Zhuzhou, 412007, China
通讯机构：
[Sun Chenhao] S;School of Electrical & Information Engineering, Changsha University of Science & Technology, Changsha, 410114, China
关键词：
condition evaluation ensemble;HPLC units;KICA-CIM;two-fold total weight
摘要：
The High-Speed Power Line Carrier Communication (HPLC) enables the connections among power metering devices in integrated energy systems, and thus their satisfying operations are indispensable for system reliabilities. In order to more precisely diagnose their conditions especially in real complex data scenes, a multi-model evaluation ensemble is proposed in this paper. Firstly, typical IoT application contexts of customer-side metering equipment are analyzed, thus the corresponding main impact factors along with their performance evaluation indices can be probed. Next, to handle the multi-source, heterogeneous, high-dimensional datasets during applications, the Kernel Independent Component Analysis (KICA) is established to diminish data dimensionalities, thus the individual weights of each index can be rated. On the other hand, the Component Importance Measure (CIM) model is built to differentiate the impact degree of each indicator on the overall IoT connection performance, where the influence of dissimilar index on the entire performance, rather than the proportion or frequency, will be directly assessed to determine their impact weights. Ergo, a comprehensive diagnosis can be achieved via these two-fold total weights accordingly. Finally, the feasibility and effectiveness of the proposed method can be verified by an empirical case study, which is conducive to further improving the accuracy and rationality of HPLC condition evaluations.
通讯机构：
[Yuanfeng Li] D;Department of Electrical and Information Engineering, Zhengzhou University of Light Industry, Zhengzhou, China
关键词：
Electric vehicle (EV);Energy management strategy (EMS);Model predictive control (MPC);Hybrid energy storage system (HESS);Energy loss
摘要：
Electric vehicle (EV) is developed because of its environmental friendliness, energy-saving and high efficiency. For improving the performance of the energy storage system of EV, this paper proposes an energy management strategy (EMS) based model predictive control (MPC) for the battery/supercapacitor hybrid energy storage system (HESS), which takes stabilizing the DC bus voltage and improving the efficiency of the system as two major optimization goals. In addition, an enumeration algorithm is presented to solve the optimization function. The experimental results show the performance of the proposed EMS which is able to enhance the overall instantaneous power and prevent the battery from overloading. Meanwhile, compared with the results of a single battery storage system, the maximum amplitude of the battery current in the HESS is reduced by 40.81% and whole system energy loss is reduced by 24.13% with the proposed power management strategy.
期刊：
Journal of Ambient Intelligence and Humanized Computing,2023年14(11):14859-14872 ISSN：1868-5137
通讯作者：
Jianxu Mao
作者机构：
[Caiping Liu; Yahui Long; Ruizhi Huang] College of Computer Science and Electronic Engineering, Hunan University, Changsha, China;[Jianxu Mao; Yang Dai] College of Electrical and Information Engineering, Hunan University, Changsha, China;[Hui Zhang] College of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha, China
通讯机构：
[Jianxu Mao] C;College of Electrical and Information Engineering, Hunan University, Changsha, China
关键词：
Convergence;Decentralized control;distributed control;distributed observer;Fractional calculus;fractional calculus;Frequency control;Islanded AC microgrids;Lyapunov function;Power system stability;predefined-time stability;secondary control;sliding mode control;Upper bound;Voltage control
摘要：
The frequency and voltage restoration along with power sharing is imperative for the safe, reliable and stable operation of the islanded AC microgrids (MGs). In this paper, a novel distributed fractional-order predefined-time sliding mode controller (DFOPTSMC) is proposed as a secondary controller for the islanded AC MGs. The proposed DFOPTSMC can ensure that frequency and estimated average voltage (EAV) converge to reference value along with accurate power sharing within a setting predefined time. The fractional calculus algorithm is implemented to design the DFOPTSMC, which increases the degree of freedom of parameter adjustment and greatly enhances the flexibility of the DFOPTSMC. In addition, a distributed predefined-time observer is presented to achieve the EAV within a setting predefined time. The upper bound convergence time of the islanded AC MGs under the proposed DFOPTSMC is directly equal to a tunable parameter, thus overcoming the disadvantages of finite-time control and fixed-time control. The Lyapunov function is applied to present rigorous proof to analyze the stability of the islanded AC MGs under the proposed DFOPTSMC. An islanded AC MG is taken into simulation on the Matlab/Simulink 2021a platform and the experimental platform to test and verify the effectiveness and superior performance of the proposed DFOPTSMC. The results indicate that the proposed DFOPTSMC can significantly enhance the dynamic performances of the islanded AC MGs.
摘要：
An adaptive single-phase auto-reclosing method based on the moving average filter (MAF)-quadrature signal generator (QSG) is developed to determine secondary arc extinction time for high-voltage transmission lines with shunt reactors. Firstly, the difference between permanent and transient faults is derived and analyzed by the equivalent circuit model. Then, MAF-QSG is utilized to extract these features from the fault voltage. During the second arc period, for transient fault, the fundamental component and subharmonic component with around 50 Hz are reserved by MAF-QSG; however, in the case of permanent fault, only the fundamental component is retained. Finally, the identification index and its threshold are designed above the extraction fault features. The performance of the proposed method is evaluated by simulation and field data studies, accounting for different transmission line compensation levels, transition resistances, and fault location conditions.
摘要：
In addition to participating in coagulation, thrombin activates complement C5a to stimulate inflammatory cells (neutrophils) to produce inflammatory mediators and participate in inflammatory responses. The DMPES membranes inhibit inflammation and thrombin. Abstract In addition to being the core factor in thrombosis, thrombin is involved in various inflammatory disease responses, but few studies have examined whether and how it is involved in membrane‐related inflammation. In this study, the thrombin inhibitor dabigatran is used to modify a polyethersulfone dialysis membrane. The modified membrane shows good hydrophilic properties and dialysis performance. It reduces the thrombin level in a targeted manner, thereby significantly inhibiting coagulation factor activation (based on the prothrombin time, international normalized ratio, activated partial thromboplastin time and thrombin time) and reducing the fibrinogen level and platelet adhesion. On thromboelastography, it shows excellent dynamic antithrombotic capacity. The modified membrane inhibited membrane‐related inflammation by inhibiting the production of the inflammatory mediators C‐reactive protein (CRP), interleukin‐6 (IL‐6), and interleukin‐1β (IL‐1β) via the thrombin/complement C5a pathway. Moreover, it is found to be safe in an in vivo study. Thus, the dabigatran‐modified polyethersulfone membrane may reduce dialysis‐related complications through its dual antithrombotic and anti‐inflammatory effects.
