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基于空间相关各向异性规则的仿真小脑模型的神经网络优化研究

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建模与仿真 2024年第3期13卷 3074-3082页

作者：陈彦东五邑大学电子与信息工程学院广东江门

仿真小脑模型的颗粒层神经元通过随机投射网络生成时空活动序列,然而网络中的空间相关性和连通性未能充分反映真实生物组织的结构原则。本文针对该问题提出一种基于新的连通规则的优化方案,借助Perlin噪声的纹理特性让神经元的连接具有... 详细信息

仿真小脑模型的颗粒层神经元通过随机投射网络生成时空活动序列,然而网络中的空间相关性和连通性未能充分反映真实生物组织的结构原则。本文针对该问题提出一种基于新的连通规则的优化方案,借助Perlin噪声的纹理特性让神经元的连接具有优先方向偏好和相邻神经元有相似的偏好,从而模拟生物神经元连接在空间上的不对称性;此外,本文还借助高斯分布设定神经元之间的连接强度,使其随着神经元之间距离的增加而呈指数衰减,这与生物学中兴奋性突触后电流随突触距离神经细胞体中心越远而减弱的现象相吻合为了验证改进的有效性,在相同条件下通过对仿真视动反射任务的对比分析,研究了优化前后的小脑模型在记忆学习能力上的差异,并对两种模型下细胞电生理变化进行了深入探讨。该优化的小脑模型不仅对小脑运动学习记忆形成有着理论意义,而且为小脑控制器提供工程上的应用价值。

关键词：小脑模型运动记忆投射网络各向异性

视动反应中PF-PC突触钙级联机制:物质状态预测

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建模与仿真 2024年第4期13卷 4460-4470页

作者：陈彦东五邑大学电子与信息工程学院广东江门

小脑的运动学习记忆所涉及的PF-PC突触权重变化被称为钙级联机制,这种机制利用化学受体磷酸化和去磷酸化的动态调节作用来模拟突触权重的变化。鉴于钙级联涉及多种化学物质组成的复杂动力学系统,在计算刺激信号是随机输入的视动反应时... 详细信息

小脑的运动学习记忆所涉及的PF-PC突触权重变化被称为钙级联机制,这种机制利用化学受体磷酸化和去磷酸化的动态调节作用来模拟突触权重的变化。鉴于钙级联涉及多种化学物质组成的复杂动力学系统,在计算刺激信号是随机输入的视动反应时耗时较大,本文创新地采用与常微分方程性质相似的长短期记忆网络来预测短周期连续状态序列,从而在保证准确性的同时,有效减少了计算成本。不仅对小脑运动学习记忆形成有着理论意义,而且为小脑控制器提供工程上的应用价值。

关键词：运动记忆钙级联 IP3 CaMKII

On fractional control method for four-wheel-steering vehicle

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Science China(Technological Sciences) 2009年第3期52卷 603-609页

作者： chen Ning chen Nan chen yandong College of Mechanical Engineering Southeast UniversityNanjing 210096China College of Mechanical and Electronic Engineering Nanjing Forestry UniversityNanjing 210037China

Four-wheel-steering (4WS) system can enhance vehicle cornering ability by steering the rear wheels in accordance with the front wheels steering and vehicle status. With such steering control system, it becomes possible to improve the lateral stability and handling performance. In this paper, a new control method for 4WS vehicle is proposed, its rear wheels steering angle is in accordance with the angle of front wheels steering and vehicle yaw rate, and the effects of front wheels steering angle velocity are considered by adopting the fractional derivative theory. Some design specifications for control law are also given. The effects of the control method are verified by a kind of numerical scheme presented in this paper. The dynamic characteristics such as the side-slip angle and the yaw angle velocity of the vehicle gravity center are compared among three kinds of vehicles with different control methods. And the kinematics characteristics such as turning radius between 4WS and 2WS are also discussed. Nu- merical simulation shows that the control method presented can improve the transient response and reduce the turning radius of 4WS vehicle.

关键词： fractional derivative four-wheel-steering computation simulation chassis control system

计及电网侧储能交互作用的MIDC后续换相失败机理分析及抑制策略

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高电压技术 2024年第7期50卷 2820-2832页

作者：尹寒航周小平陈燕东邓凌峰洪乐荣朱仁龙国家电能变换与控制工程技术研究中心(湖南大学) 长沙410082

利用电网侧储能的无功支撑能力有望改善多馈入直流输电(multi-infeed high voltage direct current,MIDC)的电压暂态特性,但是电网侧储能接入后,电力电子装备之间的相互作用会影响MIDC控制特性。在计及电网侧储能与MIDC交互作用基础上,... 详细信息

利用电网侧储能的无功支撑能力有望改善多馈入直流输电(multi-infeed high voltage direct current,MIDC)的电压暂态特性,但是电网侧储能接入后,电力电子装备之间的相互作用会影响MIDC控制特性。在计及电网侧储能与MIDC交互作用基础上,分析了故障持续阶段与故障清除阶段的MIDC后续换相失败机理。研究表明,在故障持续阶段,由于电网侧储能的交互作用,定电流控制切换为定关断角控制时直流电流更大,并且电流偏差控制输出减少使越前触发角下降,造成换相供给面积不足的影响更大;在故障清除阶段,计及直流电流振荡影响,越前触发角下降及大幅波动会导致换相供给面积不足;在MIDC系统处于功率恢复过程中,若电网侧储能无功功率指令置为0,将增大后续换相失败风险。然后,针对电网侧储能以及MIDC控制策略进行改进,提出了计及电网侧储能交互作用的MIDC后续换相失败抑制策略。最后,在多种故障类型下仿真验证了所提控制策略有效性。

关键词：多馈入直流输电系统电网侧储能后续换相失败机理分析抑制策略

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孤岛微电网多虚拟同步发电机频率无差协调控制策略

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电力系统保护与控制 2024年第7期52卷 12-23页

作者：王自力陈燕东李雪萍罗聪符有泽王海宁傅家骏电能高效高质转化全国重点实验室(湖南大学) 湖南长沙410082 湖南第一师范学院湖南长沙410082 湖南大学深圳研究院广东深圳518000

传统虚拟同步发电机的频率控制为有差控制,且虚拟惯量的引入使得虚拟同步发电机呈现二阶振荡特性,导致孤岛微电网多虚拟同步发电机并联系统在受到负荷扰动时面临频率偏移和有功超调的问题。针对此,提出了一种多虚拟同步发电机频率无差... 详细信息

传统虚拟同步发电机的频率控制为有差控制,且虚拟惯量的引入使得虚拟同步发电机呈现二阶振荡特性,导致孤岛微电网多虚拟同步发电机并联系统在受到负荷扰动时面临频率偏移和有功超调的问题。针对此,提出了一种多虚拟同步发电机频率无差协调控制方法。该方法包含了兼具有功精确分配的频率无差调节控制和阻尼改进控制两部分,通过利用母线频率全局一致的“通信”效果,以分散式的形式协调系统内各台虚拟同步发电机,可主动消除微电网频率稳态偏差且实现各台虚拟同步发电机按照容量承担负荷有功功率,并抑制系统的有功超调。最后,通过仿真和实验验证了所提控制方法的有效性。

关键词：虚拟同步发电机频率偏移无差调节有功精确分配有功超调

Calculation Method for Commutation Failure Fault Level in LCC-HVDC System Under Single-line-to-ground Faults Considering DC Current Variation

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Journal of Modern Power Systems and Clean Energy 2023年第6期11卷 1995-2002页

作者： Renlong Zhu Xiaoping Zhou Hanhang Yin Lerong Hong An Luo yandong chen Hanting Peng College of Electrical and Information Engineering Hunan UniversityChangsha 410082China School of Electrical and Information Engineering Changsha University of Science and TechnologyChangsha 410114China

Earlier studies have reported some calculation methods for commutation failure fault level(CFFL) in line-commutated-converter based high-voltage direct current(LCCHVDC) system under single-line-to-ground(SLG) faults. The accuracy of earlier methods is limited because they only consider the commutating voltage drop and phase shift, while neglecting the DC current variation. Hence, this paper proposes a CFFL calculation method under SLG faults considering DC current variation, for better planning and designing of LCC-HVDC systems. First, the fault commutating voltage magnitude and phase shift are calculated. Then, the fault DC voltage during different commutation processes is deduced. Based on the commutating voltage magnitude and phase shift, and DC voltage during different commutation processes under SLG faults, the characteristics of CFFL with different fault time are demonstrated and analyzed. Next, the transient time-domain response of the DC current after the fault is obtained based on the DC transmission line model. Discrete commutation processes are constructed based on the commutation voltage-time area rule to solve the extinction angle under different fault levels and fault time. Finally, the CFFL is calculated considering the fault time, commutating voltage drop, phase shift, and DC current variation. The accuracy of the proposed method compared with the traditional method is validated based on the CIGRE benchmark model in PSCAD/EMTDC.

关键词： Commutation failure(CF) commutation failure fault level(CFFL) line-commutated-converter-based highvoltage direct current(LCC-HVDC) single-line-to-ground(SLG)fault

Generalized coupling resonance modeling, analysis, and active damping of multi-parallel inverters in microgrid operating in grid-connected mode

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Journal of Modern Power Systems and Clean Energy 2016年第1期4卷 63-75页

作者： Zhiyong chen yandong chen Josep M.GUERRERO Huimin KUANG Yuan HUANG Leming ZHOU An LUO National Electric Power Conversion and Control Engineering Technology Research Center Hunan UniversityChangshaChina Department of Energy Technology Aalborg UniversityAalborg East 9220Denmark

This paper firstly presents an equivalent coupling circuit modeling of multi-parallel inverters in microgrid operating in grid-connected mode. By using the model, the coupling resonance phenomena are explicitly investigated through the mathematical approach, and the intrinsic and extrinsic resonances exist widely in *** the inverter own reference current, other inverters reference current, and grid harmonic voltage, the distributions of resonance peaks with the growth in the number of inverters are obtained. Then, an active damping control parameter design method is proposed to attenuate coupling resonance, and the most salient feature is that the optimal range of the damping parameter can be easily located through an initiatively graphic method. Finally,simulations and experiments verify the validity of the proposed modeling and method.

关键词： Microgrid Grid-connected mode Multi-parallel inverters Active damping Coupling resonance

Hybridized triboelectric-electromagnetic nanogenerators and solar cell for energy harvesting and wireless power transmission

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Nano Research 2022年第3期15卷 2069-2076页

作者： yandong chen Yang Jie Jiaqing Zhu Qixin Lu Yu cheng Xia Cao Zhong Lin Wang Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 100083China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China Research Center for Bioengineering and Sensing Technology Beijing Key Laboratory for Bioengineering and Sensing TechnologySchool of Chemistry and Biological EngineeringBeijing Municipal Key Laboratory of New Energy Materials and Technologiesand Center for Green InnovationSchool of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijing 100083China Center on Nanoenergy Research School of Physical Science and Technology Guangxi UniversityNanning 530004China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA30332-0245USA

Energy harvesting and power transmission is a signiﬁcant challenge for the self-powered technologies towards mobile electronic ***,we propose a hybridized energy harvester to complement each other's strengths for simultaneously scavenging multiple types of energy and then wirelessly transmit the *** harvester consists of electromagnetic-triboelectric nanogenerator units for collecting rotational energy and a commercial water-proof flexible solar *** a rotation rate of 500 rpm,the output current of electromagnetic-triboelectric nanogenerator units can reach about 630 mA through energy ***,the power harvested by hybridized energy harvester can be wirelessly transmitted up to a distance of about 100 cm in real time to charge mobile phone,anemometer,and hygrometer based on self-resonant *** hybridized energy harvester with wireless power transmission has potential applications in large-scale energy collection,long-distance wireless power transmission and sustainably driving mobile electronic devices.

关键词： triboelectric nanogenerator electromagnetic generator solar cell hybridized energy harvester

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硅灰掺量对无机磷酸盐涂料防腐性能的影响

江苏建筑 2024年第2期 132-137页

作者：单春明杨春生杨建明陈延东盐城幼儿师范高等专科学校建筑工程学院江苏盐城224005 盐城市大数据集团江苏盐城224005 盐城工学院土木工程学院江苏盐城224051 江苏兰丰环保科技有限公司江苏盐城224050

为了增强磷酸钾镁水泥(MKPC)涂料的耐腐蚀性,添加氧化镁质量5%、10%、15%、20%四种不同硅灰掺量进行改性,通过维氏硬度、抗折抗压强度、粘结强度等物理化学表征参数,进行电化学方法和中期盐雾试验,测试该涂层在常温固化下的耐腐蚀能力... 详细信息

为了增强磷酸钾镁水泥(MKPC)涂料的耐腐蚀性,添加氧化镁质量5%、10%、15%、20%四种不同硅灰掺量进行改性,通过维氏硬度、抗折抗压强度、粘结强度等物理化学表征参数,进行电化学方法和中期盐雾试验,测试该涂层在常温固化下的耐腐蚀能力。结果表明,添加氧化镁质量20%硅灰后,磷酸钾镁水泥基钢结构防腐涂料的耐腐蚀能力最佳,比空白组高480%。该防腐涂料涂覆在Q235钢表面,在3.5%氯化钠溶液环境下浸泡28 d后,经过1440 h中性盐雾腐蚀试验,Q235钢涂层表面未出现任何的锈蚀现象。

关键词：磷酸钾镁水泥硅灰掺量防腐性能