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Accuracy of the half-power bandwidth method with a third-order correction for estimating damping in multi-DOF systems 被引量:3
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作者 Wang Jinting Lü Dandan +1 位作者 Jin Feng Zhang Chuhan 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2013年第1期33-38,共6页
A third-order correction was recently suggested to improve the accuracy of the half-power bandwidth method in estimating the damping of single DOF systems.This paper analyzes the accuracy of the half-power bandwidth m... A third-order correction was recently suggested to improve the accuracy of the half-power bandwidth method in estimating the damping of single DOF systems.This paper analyzes the accuracy of the half-power bandwidth method with the third-order correction in damping estimation for multi-DOF linear systems.Damping ratios in a two-DOF linear system are estimated using its displacement and acceleration frequency response curves,respectively.A wide range of important parameters that characterize the shape of these response curves are taken into account.Results show that the third-order correction may greatly improve the accuracy of the half-power bandwidth method in estimating damping in a two-DOF system.In spite of this,the half-power bandwidth method may significantly overestimate the damping ratios of two-DOF systems in some cases. 展开更多
关键词 half-power bandwidth method third-order correction damping ratio estimation error two-DOF system
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Color Correction for Multi-view Video Using Energy Minimization of View Networks 被引量:4
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作者 Kenji Yamamoto Ryutaro Oi 《International Journal of Automation and computing》 EI 2008年第3期234-245,共12页
Systems using numerous cameras are emerging in many fields due to their ease of production and reduced cost, and one of the fields where they are expected to be used more actively in the near future is in image-based ... Systems using numerous cameras are emerging in many fields due to their ease of production and reduced cost, and one of the fields where they are expected to be used more actively in the near future is in image-based rendering (IBR). Color correction between views is necessary to use multi-view systems in IBR to make audiences feel comfortable when views are switched or when a free viewpoint video is displayed. Color correction usually involves two steps: the first is to adjust camera parameters such as gain, brightness, and aperture before capture, and the second is to modify captured videos through image processing. This paper deals with the latter, which does not need a color pattern board. The proposed method uses scale invariant feature transform (SIFT) to detect correspondences, treats RGB channels independently, calculates lookup tables with an energy-minimization approach, and corrects captured video with these tables. The experimental results reveal that this approach works well. 展开更多
关键词 MULTI-VIEW color correction image-based rendering (IBR) view networks (VNs) scale invariant feature transform (SIFT) energy minimization.
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Nuclear Fusion Research and Development Need New Relativistic Mass and Energy Corrections Given by the Information Relativity Theory 被引量:3
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作者 Hans Hermann Otto 《Journal of Applied Mathematics and Physics》 2022年第5期1813-1836,共24页
Hundred years after the conjecture of the British astronomer Eddington that the sun is powered by nuclear fusion of hydrogen, new physics theory may help make energy harvesting by nuclear fusion soon a reality. Resear... Hundred years after the conjecture of the British astronomer Eddington that the sun is powered by nuclear fusion of hydrogen, new physics theory may help make energy harvesting by nuclear fusion soon a reality. Researchers as well as investors funding fusion megaprojects are asked to deal with new relativistic corrections for mass and energy proposed by Suleiman in his Information Relativity Theory (IRT). These corrections were calculated in this contribution. It will help to decide whether a venture will be successful and to save big investments when in doubt. The assumed optimal kinetic energy for controlled nuclear fusion must be corrected to a somewhat higher level. At very high kinetic energy in the upper GeV range, it remains not enough baryonic mass to be transformed in energy. The fusion probability faded out to zero already at the golden limit of the recession speed of  between target nucleon and projectile nucleon. Cold nuclear fusion, if ever possible, is recommended for protons rather than deuterons at highest experimental possible temperatures around 1000 (K) and needs fine-tuned kinetic nucleon energy. It would be also of interest whether a golden ratio based nuclear fuel confinement chamber could be beneficial. In this connection, also cold nuclear fusion setups should be discussed. Nature is governed by the golden ratio and criticality of physical systems influenced by it, and nuclear physics is not an exception. Computer simulations of the underlying controlled nuclear fusion processes should gain profit from IRT corrected starting information and may tackle anew possible low energy nuclear transmutations considering the wave-like dark components of matter and energy. 展开更多
关键词 Controlled Thermonuclear Fusion IRT Theory Relativistic Mass correction Low energy Nuclear Reaction Golden Ratio Golden Limit of Nuclear Fusion
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Star Point Energy Center Correction of Star Simulator Based on Polar Coordinates
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作者 WANG Lingyun WANG Xinghua +4 位作者 WANG Bo ZHANG Guoyu SUN Gaofei LIU Shi LI Wenjun 《空间科学学报》 CAS CSCD 北大核心 2016年第3期407-412,共6页
In this paper,various aberrations have been analyzed.Not only the effects of aberration on geometrical center position are taken into account,but also the deviation of displayed star position energy center caused by a... In this paper,various aberrations have been analyzed.Not only the effects of aberration on geometrical center position are taken into account,but also the deviation of displayed star position energy center caused by aberration is analyzed.These two aspects have been taken into comprehensive evaluation and star position correction.The correction method based on polar coordinates is proposed,and cumbersome partition correction and calculated quantity based on two-dimensional coordinates can be simplified.The experimental results show that the correction processing based on polar coordinates is simpler and easier compared with any other correction methods.In addition,the correction results are significantly more accurate. 展开更多
关键词 ABERRATION energy center correction Polar coordinates
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Studies on absorption coefficients of dual-energy γ-rays and measur-ing error correction for multiphase fraction determination 被引量:1
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作者 LI Zhi-Biao WU Ying-Xiang LI Dong-Hui 《Nuclear Science and Techniques》 SCIE CAS CSCD 2006年第2期86-91,共6页
In this article, principle and mathematical method of determining the phase fractions of multiphase flows by using a dual-energy γ -ray system have been described. The dual-energy γ -ray device is composed of radioa... In this article, principle and mathematical method of determining the phase fractions of multiphase flows by using a dual-energy γ -ray system have been described. The dual-energy γ -ray device is composed of radioactive isotopes of 241Am and 137Cs with γ -ray energies of 59.5 and 662 keV, respectively. A rational method to calibrate the absorption coefficient was introduced in detail. The modified arithmetic is beneficial to removing the extra Compton scattering from the measured value. The result shows that the dual-energy γ -ray technique can be used in three-phase flow with average accuracy greater than 95%, which enables us to determine phase fractions almost independent of the flow regime. Improvement has been achieved on measurement accuracy of phase fractions. 展开更多
关键词 吸收系数 相位分形 双重能量 多相流 错误校正
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Free Energy Level Correction by Monte Carlo Resampling with Weighted Histogram Analysis Method
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作者 Seyoung Chung Sun Mi Choi +2 位作者 Wook Lee Kwang Hyun Cho Young Min Rhee 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2020年第2期183-195,I0003,I0010-I0017,共22页
Free energy calculations may provide vital information for studying various chemical and biological processes.Quantum mechanical methods are required to accurately describe interaction energies,but their computations ... Free energy calculations may provide vital information for studying various chemical and biological processes.Quantum mechanical methods are required to accurately describe interaction energies,but their computations are often too demanding for conformational sampling.As a remedy,level correction schemes that allow calculating high level free energies based on conformations from lower level simulations have been developed.Here,we present a variation of a Monte Carlo(MC)resampling approach in relation to the weighted histogram analysis method(WHAM).We show that our scheme can generate free energy surfaces that can practically converge to the exact one with sufficient sampling,and that it treats cases with insufficient sampling in a more stable manner than the conventional WHAM-based level correction scheme.It can also provide a guide for checking the uncertainty of the levelcorrected surface and a well-defined criterion for deciding the extent of smoothing on the free energy surface for its visual improvement.We demonstrate these aspects by obtaining the free energy maps associated with the alanine dipeptide and proton transfer network of the KillerRed protein in explicit water,and exemplify that the MC resampled WHAM scheme can be a practical tool for producing free energy surfaces of realistic systems. 展开更多
关键词 Free energy level correction Weighted histogram analysis method Monte Carlo resampling
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The Alignment of Angular Momentum and Its Influence on Shell Correction Energy and Potential Energy Surface
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作者 Gu Jianzhong~(1,2) Wu Xizhen~2 Zhou Yizhong~21 CCAST(Warld Lab.),P.O.Box 8730,Beijing 1000802 China Institude of Atomic Energy,P.O.Box 275(18),Beijing 102413 《Chinese journal of nuclear physics》 1996年第4期219-226,共8页
The alignment of the angular momenta in single-particle energy levels is studied based on a ro-taring two-center shell model for heavy-nucleus <sup>238</sup>U.It is found that large deformation of the nucl... The alignment of the angular momenta in single-particle energy levels is studied based on a ro-taring two-center shell model for heavy-nucleus <sup>238</sup>U.It is found that large deformation of the nucleusfavours the alignment and a complete alignment of the angular momenta occurs only at large deformationand high cranked frequency.Meanwhile,it is shown that the shell correction energy is mainly determinedby the deformation of the nucleus and slightly varies with the total spin except that the total spin is largerthan 80(?).It is also found that the two valleys of the potential energy surface become shaUow and finallydisappear with the increase of total spin. 展开更多
关键词 —Alignment of angular MOMENTUM SHELL correction energy Deformation of NUCLEUS
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Use of sampling based correction for non-radioactivity X-ray energy calibration
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作者 CHENGCheng WEIYong-Bo JIANGDa-Zhen 《Nuclear Science and Techniques》 SCIE CAS CSCD 2005年第3期167-170,共4页
As the requirement of non-radioactivity measurement has increased in recent years,various energy cali- bration methods applied in portable X-ray fluorescence (XRF) spectrometers have been developed. In this paper,a sa... As the requirement of non-radioactivity measurement has increased in recent years,various energy cali- bration methods applied in portable X-ray fluorescence (XRF) spectrometers have been developed. In this paper,a sampling based correction energy calibration has been discussed. In this method both history information and current state of the instrument are considered and relative high precision and reliability can be obtained. 展开更多
关键词 X-射线荧光谱仪 能量刻度 修正指数 辐射探测器
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Rem-meter correction factor for measuring high energyneutrons outside concrete shielding
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作者 Li Gui-Sheng (Institute of Modern Physics, the Chinese Academy of Sciences, Lanzhou 730000) 《Nuclear Science and Techniques》 SCIE CAS CSCD 1998年第2期109-112,共4页
Correction factors of both Rem-meters, the 10 inch diameter single-sphere Remmeter and the standard A-B Rem-meter, were estimated for measuring high energy neutron dose equivalent outside a concrete shielding wall and... Correction factors of both Rem-meters, the 10 inch diameter single-sphere Remmeter and the standard A-B Rem-meter, were estimated for measuring high energy neutron dose equivalent outside a concrete shielding wall and the effects that the emitted neutron spectra become remarkably "harder" penetrated through a concrete shielding wall, and the energy response of the Rem-meter were taken in account. The estimated results could be applied in the measurement of neutron dose equivalent for the intermediate energy heavy ion reactions to avoid the difficulty induced by the energy response of the Rem-meters. 展开更多
关键词 高能中子 混凝土屏蔽 雷姆米修正因子
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Feasibility of Improved Attenuation Correction for SPECT Reconstruction in the Presence of Dense Materials Using Dual-Energy Virtual Monochromatic CT: A Phantom Study
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作者 Sachiko Yamada Takashi Ueguchi +4 位作者 Eku Shimosegawa Koichi Fujino Takeshi Shimazu Kenya Murase Jun Hatazawa 《Open Journal of Medical Imaging》 2015年第4期183-193,共11页
Objective: Computed tomography (CT)-based attenuation correction (CTAC) offers the clear benefit of reliable reconstruction of single-photon emission computed tomography (SPECT) images through its ability to achieve o... Objective: Computed tomography (CT)-based attenuation correction (CTAC) offers the clear benefit of reliable reconstruction of single-photon emission computed tomography (SPECT) images through its ability to achieve object-specific attenuation maps, but artifacts from dense materials often deteriorate CTAC performance. Therefore, we investigate the feasibility of CTAC in the presence of dense materials using dual-energy virtual monochromatic CT data. Methods: A sodium pertechnetate-filled cylindrical uniform phantom, with a pair of undiluted iodine syringes attached, is scanned with a dual-source CT scanner to obtain both single-energy (120 kVp) polychromatic and dual-energy (80 kVp/140 kVp with tin filtering) virtual monochromatic CT images. The single-energy and the dual-energy CT images are then converted to attenuation maps at 141 keV. SPECT images are reconstructed from 99mTc emission data of the phantom using each single-energy and dual-energy attenuation map and incorporating CTAC procedure. A region-of-in- terest analysis is performed to quantitatively compare the attenuation maps between the single-energy and the dual-energy techniques, each at an iodine-free position and a position adjacent to the iodine solutions. Results: At the iodine-free position, the phantom provides a uniform distribution of attenuation maps in both the single-energy and the dual-energy techniques. In the presence of adjacent iodine solutions, however, severe artifacts appeare in the single-energy CT images. These artifacts make attenuation values fluctuate, resulting in erroneous pixel values in the CTAC SPECT images. In contrast, dual-energy CT strongly suppresses the artifacts and hence improves the uniformity of the attenuation maps and the resultant SPECT images. Conclusions: Dual-energy CT with virtual monochromatic reconstruction has the potential to substantially reduce artifacts arising from dense materials. It has the potential to improve the accuracy of attenuation maps and the resultant CTAC SPECT images. 展开更多
关键词 SPECT Attenuation correction DUAL-energy CT VIRTUAL MONOCHROMATIC Imaging ARTIFACT Reduction
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Study on element detection and its correction in iron ore concentrate based on a prompt gamma-neutron activation analysis system 被引量:4
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作者 Long Zhao Xu Xu +6 位作者 Jing-Bin Lu Ya-Lin Gong Xiang-Lin Li Wei Zhang Qing-Min Shang Qing-Feng Song Yan-Feng Li 《Nuclear Science and Techniques》 SCIE CAS CSCD 2019年第4期44-52,共9页
A prompt gamma-neutron activation analysis(PGNAA) system was developed to detect the iron content of iron ore concentrate. Because of the self-absorption effect of gamma-rays and neutrons, and the interference of chlo... A prompt gamma-neutron activation analysis(PGNAA) system was developed to detect the iron content of iron ore concentrate. Because of the self-absorption effect of gamma-rays and neutrons, and the interference of chlorine in the neutron field, the linear relationship between the iron analytical coefficient and total iron content was poor, increasing the error in the quantitative analysis. To solve this problem, gamma-ray self-absorption compensation and a neutron field correction algorithm were proposed, and the experimental results have been corrected using this algorithm. The results show that the linear relationship between the iron analytical coefficient and total iron content was considerably improved after the correction. The linear correlation coefficients reached 0.99 or more. 展开更多
关键词 PROMPT gamma-neutron activation analysis SELF-ABSORPTION energy spectrum Compensation correction Iron ORE CONCENTRATE
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The Coherent State of the Landau Hamiltonian and the Relativistic Corrections to the Zeeman Effect in He<sup>+</sup>Ions
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作者 Kunnat Sebastian Wangyao Li 《Journal of Modern Physics》 2020年第3期455-474,共20页
We calculate the energy levels of He+ ion placed in a uniform magnetic field directed perpendicular to the direction of its center of mass (CM) velocity vector, correct to relative order . Our calculations are within ... We calculate the energy levels of He+ ion placed in a uniform magnetic field directed perpendicular to the direction of its center of mass (CM) velocity vector, correct to relative order . Our calculations are within the frame work of an approximately relativistic theory, correct to relative order , of a two-particle composite system bound by electromagnetic forces, and written in terms of the position, momentum and spin operators of the constituent particles as proposed by Krajcik and Foldy, and also by Close and Osborn. Since the He+ ion has a net electric charge, the total or the CM momentum is not conserved and a neat separation of the CM and the internal motion is not possible. What is new in our approach is that, for the basis states in a first order degenerate perturbation theory to calculate the effects of the external magnetic field, we use the direct product of the coherent state of the Landau Hamiltonian of the He+ ion in a uniform magnetic field and of the simultaneous eigenstate of the internal Hamiltonian h, j2, l2, s2 and jz,?where j, l and s are the internal total, orbital and spin angular moments of the He+ ion. The coherent state is an excellent approximation to the expected classical circular motion of the center of mass (CM) of the He+ ion. In addition to the Z2 a2 corrections to the usual nonrelativistic results, including the small corrections due to the nuclear motion, we also obtain corrections which depend on the kinetic energy (ECM ) of the CM circular motion of the He+ ion, in a nontrivial way. Even though these corrections are proportional to , where M is the mass of the He+ ion, and are small for nonrelativistic CM motion, the results should be verifiable in careful experiments. Our results may also have application in astrophysical observations of the spectral lines of He+ ions in magnetized astrophysical objects. 展开更多
关键词 RELATIVISTIC correctionS Zeman Effect Helium Ion in a Magnetic Field Coherent State LANDAU HAMILTONIAN energy Levels
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A Physical Insight into the Origin of the Corrections to the Magnetic Moment of Free and Bound Electron
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作者 Nicolae Bogdan Mandache 《Journal of Modern Physics》 2020年第9期1301-1311,共11页
The main goal of the present work is a unitary approach of the physical origin of the corrections to the magnetic moment of free and bound electron. Based on this approach, estimations of lowest order corrections were... The main goal of the present work is a unitary approach of the physical origin of the corrections to the magnetic moment of free and bound electron. Based on this approach, estimations of lowest order corrections were easily obtained. In the non-relativistic limit, the Dirac electron appears as a distribution of charge and current extended over a region of linear dimension of the order of Compton wavelength, which generates its magnetic moment. The e.m. mass (self-energy) of electron outside this region does not participate to this internal dynamics, and consequently does not contribute to the mass term in the formula of the magnetic moment. This is the physical origin of the small increase of the magnetic moment of free electron compared to the value given by Dirac equation. We give arguments that this physical interpretation is self-consistent with the QED approach. The bound electron being localized, it has kinetic energy which means a mass increase from a relativistic point of view, which determines a magnetic moment decrease (relativistic Breit correction). On the other hand, the e.m. mass of electron decreases at the formation of the bound state due to coulomb interaction with the nucleus. We estimated this e.m. mass decrease of bound electron only in its internal dynamics region, and from it the corresponding increase of the magnetic moment (QED correction). The corrections to the mass value are at the origin of the lowest order corrections to the magnetic moment of free and bound electron. 展开更多
关键词 Magnetic Moment of Dirac Electron Electromagnetic Self-energy Physical Origin of the corrections to the Magnetic Moment of Free and Bound Electron
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基于深度强化学习的电-气区域综合能源系统安全校正控制决策方法
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作者 彭寒梅 胡磊 +2 位作者 谭貌 李金果 苏永新 《电网技术》 EI CSCD 北大核心 2024年第3期1019-1029,共11页
电–气区域综合能源系统电、气相互耦合与影响,使得其安全校正控制难度大且对快速性要求高,为此,提出一种基于深度确定性策略梯度(deepdeterministicpolicy gradient,DDPG)算法的安全校正控制决策方法。首先,进行系统多能流与变量分析,... 电–气区域综合能源系统电、气相互耦合与影响,使得其安全校正控制难度大且对快速性要求高,为此,提出一种基于深度确定性策略梯度(deepdeterministicpolicy gradient,DDPG)算法的安全校正控制决策方法。首先,进行系统多能流与变量分析,建立安全校正控制的目标与约束条件。然后,构建基于DDPG的安全校正控制模型,设计目标奖励和各种约束条件奖励,提出结合基于综合灵敏度的安全校正知识经验设计目标奖励函数,使调整具有方向性,且目标奖励考虑能量枢纽(energy hub,EH)的经济效益及其可再生能源消纳;通过智能体离线训练,使其能够在线做出实时最优的安全校正控制策略,预先产生专家经验数据集存放于经验回放池,提高训练速度和收敛性。最后,通过含EH电–气区域综合能源系统仿真算例验证了所提方法的有效性。 展开更多
关键词 电–气区域综合能源系统 安全校正控制 深度强化学习 综合灵敏度 能量枢纽
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一种基于相位误差校正技术的快速启动晶体振荡器
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作者 王子轩 王山虎 +5 位作者 王鑫 姚佳飞 张珺 胡善文 蔡志匡 郭宇锋 《电子学报》 EI CAS CSCD 北大核心 2024年第4期1182-1188,共7页
随着超低功耗(Ultra-Low Power,ULP)物联网(Internet of Things,IoT)系统的发展,采用能量注入技术的快速启动晶体振荡器因对IoT系统功耗影响巨大而逐渐成为研究热点.能量注入技术可以显著降低晶体振荡器的启动时间和启动能量,但是对注... 随着超低功耗(Ultra-Low Power,ULP)物联网(Internet of Things,IoT)系统的发展,采用能量注入技术的快速启动晶体振荡器因对IoT系统功耗影响巨大而逐渐成为研究热点.能量注入技术可以显著降低晶体振荡器的启动时间和启动能量,但是对注入源的精度要求苛刻.为了扩大注入频偏容限以及实现高注入效率,本文提出了一种基于延迟锁定环的相位误差校正技术.该技术将注入频偏容限扩大到2%,启动过程的非注入持续时间仅为4个周期,实现了高效注入.本文所述晶体振荡器采用40 nm CMOS工艺设计并流片.在1.0 V电源电压下采用24 MHz晶体进行测试,当注入频偏高达2%时,实现了7.2μs的启动时间,启动能量为5.1 nJ.相比同频偏下的传统注入方案,启动时间缩短了99.66%. 展开更多
关键词 相位误差校正 晶体振荡器 快速启动 延迟锁定环 能量注入
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基于深度学习的新能源场站不良数据辨识与修正方法
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作者 翟晶晶 乔阳 郝思鹏 《电力需求侧管理》 2024年第5期28-35,共8页
针对新能源场站数据采集错误的问题,考虑到新能源场站数据具有海量和相互耦合的特点,提出一种基于深度学习的新能源场站不良数据辨识与修正方法。首先,构建长短期记忆神经网络模型,利用偏差阈值进行判断得到标识的不良数据;在此基础上,... 针对新能源场站数据采集错误的问题,考虑到新能源场站数据具有海量和相互耦合的特点,提出一种基于深度学习的新能源场站不良数据辨识与修正方法。首先,构建长短期记忆神经网络模型,利用偏差阈值进行判断得到标识的不良数据;在此基础上,提出了萤火虫算法优化的BP修正模型,建立修正评判标准,将标识的不良数据进行修正,得到新能源场站可靠的运行数据;最后,通过实际数据集对方法的有效性进行了验证,结果表明所提方法能够有效处理新能源场站运行不良数据,具有实际应用价值。 展开更多
关键词 深度学习 数据辨识 数据修正 新能源
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基于脉冲分离的数字高斯合成成形堆积校正方法
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作者 张怀强 张佳俊 +2 位作者 冉吉发 胡玲玲 魏勇 《东华理工大学学报(自然科学版)》 CAS 北大核心 2024年第5期466-473,共8页
为解决基于时间比较堆积识别方法无法处理多个脉冲峰堆积的问题,提出一种基于脉冲分离的堆积校正方法。在核脉冲信号数字高斯成形处理系统中,采用快慢双通道成形,分别构建二维、三维线性方程组,推导不同脉冲堆积情况下的幅度校正函数。... 为解决基于时间比较堆积识别方法无法处理多个脉冲峰堆积的问题,提出一种基于脉冲分离的堆积校正方法。在核脉冲信号数字高斯成形处理系统中,采用快慢双通道成形,分别构建二维、三维线性方程组,推导不同脉冲堆积情况下的幅度校正函数。结果表明,脉冲分离堆积校正方法可有效实现多个峰堆积情况下的堆积识别与脉冲幅度校正,保留更多的核脉冲信号。对LaBr_(3)探测器的模拟测试,当输入计数率达到6.125×10^(5)/s,脉冲分离堆积校正法使能量分辨率从12.31%提高到3.73%,峰位计数由1104提高至3424,该方法可进一步应用于数字核能谱测量系统中脉冲堆积识别与幅度校正。 展开更多
关键词 数字核能谱 脉冲分离 能量分辨率 堆积校正
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基于混合储能荷电状态的光伏直流微网系统能量分配策略
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作者 胡治国 李永杰 张磊冲 《电源技术》 CAS 北大核心 2024年第2期337-344,共8页
针对混合储能系统在平抑光伏波动以及负荷投切时荷电状态(SOC)易越限问题,提出一种基于混合储能SOC的多模式协调控制策略。在传统低通滤波功率分配的基础上,提出一种基于超级电容荷电状态的动态功率修正策略,使超级电容出力后SOC向安全... 针对混合储能系统在平抑光伏波动以及负荷投切时荷电状态(SOC)易越限问题,提出一种基于混合储能SOC的多模式协调控制策略。在传统低通滤波功率分配的基础上,提出一种基于超级电容荷电状态的动态功率修正策略,使超级电容出力后SOC向安全状态恢复;同时,为避免蓄电池频繁切换充放电状态,在其响应环节加入优化后的延时控制。此外,根据光伏出力情况、混合储能SOC,设计出满足直流微网系统动态平衡的六种运行模式,实时调节各储能单元出力情况。在MATLAB/Simulink中搭建了光伏直流微网混合储能系统仿真模型,仿真结果表明所提策略在各工况下均能稳定运行,有效延长了储能介质使用寿命。 展开更多
关键词 直流微网 混合储能 荷电状态 协调控制 功率修正
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能量泛函及Euler-Lagrange方程在图像降噪中的应用研究
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作者 王海燕 《佳木斯大学学报(自然科学版)》 CAS 2024年第6期173-175,180,共4页
研究了自适应分数阶偏微分方程修正模型的能量泛函及Euler-Lagrange方程。首先,定义了自适应分数阶偏微分方程修正模型的能量泛函,其中包含未知函数和拉格朗日乘子的集合。然后,通过求解能量泛函的极值方程,推导出了Euler-Lagrange方程... 研究了自适应分数阶偏微分方程修正模型的能量泛函及Euler-Lagrange方程。首先,定义了自适应分数阶偏微分方程修正模型的能量泛函,其中包含未知函数和拉格朗日乘子的集合。然后,通过求解能量泛函的极值方程,推导出了Euler-Lagrange方程。最后,讨论了Euler-Lagrange方程在自适应分数阶偏微分方程修正模型中的应用。 展开更多
关键词 分数阶微分方程 能量泛函 EULER-LAGRANGE方程 修正模型
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基于校正条件生成对抗网络的风电场群绿氢储能系统容量配置 被引量:2
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作者 朱玲 李威 +1 位作者 王骞 张学广 《电工技术学报》 EI CSCD 北大核心 2024年第3期714-730,共17页
以条件生成对抗网络(CGAN)为代表的半监督学习可计及风电波动并生成出力场景集合,生成的数据可输入氢气储能容量配置模型以支撑优化求解。为此,该文首先设计一种校正条件生成对抗网络(CCGAN),并基于风电预测误差构建条件校正器,对预测... 以条件生成对抗网络(CGAN)为代表的半监督学习可计及风电波动并生成出力场景集合,生成的数据可输入氢气储能容量配置模型以支撑优化求解。为此,该文首先设计一种校正条件生成对抗网络(CCGAN),并基于风电预测误差构建条件校正器,对预测失准事件和风电爬坡事件下输入生成器的标签信息进行识别和校正;然后,以储能定容的综合成本和各风场弃风成本为目标函数,构建绿氢储能容量配置的多目标优化模型,并引入基于切比雪夫距离的膝区域数学概念,以指导多目标优化算法设计;最后,以新英格兰39节点系统为例进行算例分析,结果表明未经校正的条件信息将导致定容决策偏离实际,而CCGAN能生成计及风电不确定性的高置信出力场景,使得容量配置结果兼顾鲁棒性和经济性。 展开更多
关键词 校正条件生成对抗网络 绿氢储能 容量配置 场景生成 风电预测误差
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