In this paper,we propose an RLC equivalent circuit model theory which can accurately predict the spectral response and resonance characteristics of metamaterial absorption structures,extend its design,and characterize...In this paper,we propose an RLC equivalent circuit model theory which can accurately predict the spectral response and resonance characteristics of metamaterial absorption structures,extend its design,and characterize the parameters of the model in detail.By employing this model,we conducted computations to characterize the response wavelength and bandwidth of variously sized metamaterial absorbers.A comparative analysis with Finite Difference Time Domain(FDTD)simulations demonstrated a remarkable level of consistency in the results.The designed absorbers were fabricated using micro-nano fabrication processes,and were experimentally tested to demonstrate absorption rates exceeding 90%at a wavelength of 9.28μm.The predicted results are then compared with test results.The comparison reveals good consistency in two aspects of the resonance responses,thereby confirming the rationality and accuracy of this model.展开更多
With the rise of the electric vehicle industry,as the power source of electric vehicles,lithium battery has become a research hotspot.The state of charge(SOC)estimation and modelling of lithium battery are studied in ...With the rise of the electric vehicle industry,as the power source of electric vehicles,lithium battery has become a research hotspot.The state of charge(SOC)estimation and modelling of lithium battery are studied in this paper.The ampere-hour(Ah)integration method based on external characteristics is analyzed,and the open-circuit voltage(OCV)method is studied.The two methods are combined to estimate SOC.Considering the accuracy and complexity of the model,the second-order RC equivalent circuit model of lithium battery is selected.Pulse discharge and exponential fitting of lithium battery are used to obtain corresponding parameters.The simulation is carried out by using fixed resistance capacitance and variable resistance capacitor respectively.The accuracy of variable resistance and capacitance model is 2.9%,which verifies the validity of the proposed model.展开更多
大语言模型(large language model,LLM)在一般性教学辅助、文科课程和计算机课程中得到成功应用,但应用于电力电子实验教学时存在电路拓扑图识别不准、关键信息缺失等问题。为此,该文提出基于智能插件和LLM的教学辅助设计方法:首先通过...大语言模型(large language model,LLM)在一般性教学辅助、文科课程和计算机课程中得到成功应用,但应用于电力电子实验教学时存在电路拓扑图识别不准、关键信息缺失等问题。为此,该文提出基于智能插件和LLM的教学辅助设计方法:首先通过深度学习模型实现电路拓扑图识别,并将其转换为电路网表文本;然后向LLM提供网表文本及不同提示词,引导LLM实现网表检查、电路分析、文档生成、知识问答等教学功能,为教师提供高质量的教学设计起点。该方法有望减轻教师负担,提高实验教学的时效性和教学质量,为电力电子实验教学设计提供一种有用工具。展开更多
为持续推进国家“双碳”目标,优化储能电池的寿命和经济性,通过建立计及温度和循环次数的电池寿命模型,并结合开路电压测试、混合脉冲功率特性(hybrid pulse power characterization,HPPC)实验、充放电循环实验和日历老化实验等方法,研...为持续推进国家“双碳”目标,优化储能电池的寿命和经济性,通过建立计及温度和循环次数的电池寿命模型,并结合开路电压测试、混合脉冲功率特性(hybrid pulse power characterization,HPPC)实验、充放电循环实验和日历老化实验等方法,研究了储能电池的寿命特性及经济性优化策略。结果表明,采用全寿命周期经济等值为上层优化目标、系统日区间最优运行策略为下层优化目标的双层优化配置模型,可有效提升储能系统的经济性。在内蒙古自治区某牧区风储微电网的算例分析中,优化后风机装机功率由60 kW调整为30 kW,储能电池容量优化为1103 kW·h,储能系统总运行成本减少5.02×10^(5)元,并揭示了温度和循环次数对系统运行成本的影响规律。可见,该优化方法可在确保系统稳定运行的前提下,提升储能系统的经济性与可推广性,为储能技术的工程应用提供理论支撑。展开更多
Chain length of closed circle DNA is equal. The same closed circle DNA＇s position corresponds to different recognition sequence, and the same recognition sequence corresponds to different foreign DNA segment, so clos...Chain length of closed circle DNA is equal. The same closed circle DNA＇s position corresponds to different recognition sequence, and the same recognition sequence corresponds to different foreign DNA segment, so closed circle DNA computing model is generalized. For change positive-weighted Hamilton circuit problem, closed circle DNA algorithm is put forward. First, three groups of DNA encoding are encoded for all arcs, and deck groups are designed for all vertices. All possible solutions are composed. Then, the feasible solutions are filtered out by using group detect experiment, and the optimization solutions are obtained by using group insert experiment and electrophoresis experiment. Finally, all optimization solutions are found by using detect experiment. Complexity of algorithm is concluded and validity of DNA algorithm is explained by an example. Three dominances of the closed circle DNA algorithm are analyzed, and characteristics and dominances of group delete experiment are discussed.展开更多
针对目前荷电状态(state of charge,SOC)估计方法考虑温度与退化共同影响及其关联耦合关系较少,导致电池性能退化后的模型表征不完善、SOC估计精度不足的问题,提出一种基于退化注入场路耦合模型的锂电池SOC估计方法,以实现全寿命周期下...针对目前荷电状态(state of charge,SOC)估计方法考虑温度与退化共同影响及其关联耦合关系较少,导致电池性能退化后的模型表征不完善、SOC估计精度不足的问题,提出一种基于退化注入场路耦合模型的锂电池SOC估计方法,以实现全寿命周期下SOC的准确估计。首先建立等效电路模型与多物理场模型耦合的场路耦合模型,刻画温度的影响;进而使用离线参数辨识方法将温度、退化等因素注入等效电路模型参数中;最终建立代理模型提高计算效率,实现在线SOC估计。案例验证结果表明,在锂电池经过长时间运行发生退化后,相比于其他方法,所提方法的估计结果具有更平稳的曲线和更高的精度。展开更多
基金Supported by the National Natural Science Foundation of China(62174092)the Open Fund of State Key Laboratory of Infrared Physics(SITP-NLIST-ZD-2023-04)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB0580000)。
文摘In this paper,we propose an RLC equivalent circuit model theory which can accurately predict the spectral response and resonance characteristics of metamaterial absorption structures,extend its design,and characterize the parameters of the model in detail.By employing this model,we conducted computations to characterize the response wavelength and bandwidth of variously sized metamaterial absorbers.A comparative analysis with Finite Difference Time Domain(FDTD)simulations demonstrated a remarkable level of consistency in the results.The designed absorbers were fabricated using micro-nano fabrication processes,and were experimentally tested to demonstrate absorption rates exceeding 90%at a wavelength of 9.28μm.The predicted results are then compared with test results.The comparison reveals good consistency in two aspects of the resonance responses,thereby confirming the rationality and accuracy of this model.
基金Project(51507073)supported by the National Natural Science Foundation of China。
文摘With the rise of the electric vehicle industry,as the power source of electric vehicles,lithium battery has become a research hotspot.The state of charge(SOC)estimation and modelling of lithium battery are studied in this paper.The ampere-hour(Ah)integration method based on external characteristics is analyzed,and the open-circuit voltage(OCV)method is studied.The two methods are combined to estimate SOC.Considering the accuracy and complexity of the model,the second-order RC equivalent circuit model of lithium battery is selected.Pulse discharge and exponential fitting of lithium battery are used to obtain corresponding parameters.The simulation is carried out by using fixed resistance capacitance and variable resistance capacitor respectively.The accuracy of variable resistance and capacitance model is 2.9%,which verifies the validity of the proposed model.
文摘大语言模型(large language model,LLM)在一般性教学辅助、文科课程和计算机课程中得到成功应用,但应用于电力电子实验教学时存在电路拓扑图识别不准、关键信息缺失等问题。为此,该文提出基于智能插件和LLM的教学辅助设计方法:首先通过深度学习模型实现电路拓扑图识别,并将其转换为电路网表文本;然后向LLM提供网表文本及不同提示词,引导LLM实现网表检查、电路分析、文档生成、知识问答等教学功能,为教师提供高质量的教学设计起点。该方法有望减轻教师负担,提高实验教学的时效性和教学质量,为电力电子实验教学设计提供一种有用工具。
基金supported by the National Natural Science Foundation of China(60574041)the Natural ScienceFoundation of Hubei Province(2007ABA407).
文摘Chain length of closed circle DNA is equal. The same closed circle DNA＇s position corresponds to different recognition sequence, and the same recognition sequence corresponds to different foreign DNA segment, so closed circle DNA computing model is generalized. For change positive-weighted Hamilton circuit problem, closed circle DNA algorithm is put forward. First, three groups of DNA encoding are encoded for all arcs, and deck groups are designed for all vertices. All possible solutions are composed. Then, the feasible solutions are filtered out by using group detect experiment, and the optimization solutions are obtained by using group insert experiment and electrophoresis experiment. Finally, all optimization solutions are found by using detect experiment. Complexity of algorithm is concluded and validity of DNA algorithm is explained by an example. Three dominances of the closed circle DNA algorithm are analyzed, and characteristics and dominances of group delete experiment are discussed.
文摘针对目前荷电状态(state of charge,SOC)估计方法考虑温度与退化共同影响及其关联耦合关系较少,导致电池性能退化后的模型表征不完善、SOC估计精度不足的问题,提出一种基于退化注入场路耦合模型的锂电池SOC估计方法,以实现全寿命周期下SOC的准确估计。首先建立等效电路模型与多物理场模型耦合的场路耦合模型,刻画温度的影响;进而使用离线参数辨识方法将温度、退化等因素注入等效电路模型参数中;最终建立代理模型提高计算效率,实现在线SOC估计。案例验证结果表明,在锂电池经过长时间运行发生退化后,相比于其他方法,所提方法的估计结果具有更平稳的曲线和更高的精度。
