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Short-term Photovoltaic Power Prediction Based on Feature Optimization and Hybrid Improved Grey Wolf Algorithm-optimized BiLSTM Network

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Dianwang Jishu/Power System Technology 2025年第1期49卷 209-222页

作者： Zhao, Ruyi Wang, Xiaohui Zheng, Bihuang Li, Daoxing gao, yi Guo, Pengtian China Electric Power Research Institute Haidian District Beijing 100192 China Economic and Technological Research Institute State Grid Tianjin Electric Power Company Hedong District Tianjin 300171 China

To address the challenges posed by strong noise interference in photovoltaic (PV) sequences and the issues of low accuracy and poor generalization of a single model in PV power prediction, we propose a short-term PV power prediction method. This method uses feature optimization and a hybrid improved Grey Wolf algorithm to optimize the BiLSTM network. Firstly, the mutual information algorithm is employed for variable selection in input data to eliminate redundant variables. Subsequently, the Complementary Ensemble Empirical Mode Decomposition and an improved wavelet threshold algorithm are applied to the selected data for feature reconstruction to reduce noise interference in the data and optimize input variable features. Finally, the standard Grey Wolf Optimizer algorithm underwent hybrid optimization by integrating improved Tent chaotic mapping, nonlinear decreasing factors, dynamic weight strategies, and the differential evolution algorithm. This process aimed to ascertain the optimal hyperparameter combination for the BiLSTM network. The attention mechanism was also employed to extract key temporal information from the data, developing a novel short-term photovoltaic power prediction model. Simulation experiments demonstrate that, compared to the least squares support vector machine, long short-term memory network, and bidirectional long short-term memory neural network, the proposed model achieves an average reduction of 12.45%, 7.95%, and 5.37% in root mean square error under various weather conditions such as sunny, cloudy, overcast, and rainy, showcasing excellent predictive performance, good generalization ability, and promising engineering application value. © 2025 Power System Technology Press. All rights reserved.

关键词： Mean square error

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加州大学洛杉矶分校“本科生发起教育”项目的实施与特点

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黑龙江高教研究 2025年第2期43卷 81-87页

作者：高芳祎王思诗华东理工大学上海200237

美国加州大学洛杉矶分校(UCLA)的“本科生发起教育”(USIE)项目,是一项选择优秀的高年级本科生,让他们在导师指导下,围绕自己选择的某个主题开设课程并开展教学的革新项目。该项目从学生倡议提出到最终成为UCLA的永久教育项目,经过严格... 详细信息

美国加州大学洛杉矶分校(UCLA)的“本科生发起教育”(USIE)项目,是一项选择优秀的高年级本科生,让他们在导师指导下,围绕自己选择的某个主题开设课程并开展教学的革新项目。该项目从学生倡议提出到最终成为UCLA的永久教育项目,经过严格论证和长期试验,历时十年之久,是比较成功的“以学生为中心”课程革新项目。从“学生中心生态系统”(SCE)视角审视,USIE的成功离不开其在课程权力分享、教学支持提供、项目质量保障、管理制度融入、政策文化重塑等方面表现出的多维统一特点。我国在“以学生为中心”的一流本科课程建设过程中,应注意整合兼顾课程开发、教学支持、质量保障、管理制度和政策文化等层面系统化推进课程革新,特别要加强学生赋权,强化组织治理,注重质量监测,推动文化再造,使以学生为中心的变革不停留在理念口号、角色转变、关系重建等单一要素或维度,而是成为一种弥散于整个大学机体的文化精神。

关键词：本科生发起教育学生中心生态系统特点

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Modeling study on seasonal variation in aerosol extinction properties over China

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Journal of Environmental Sciences 2014年第1期26卷 97-109页

作者： yi gao Meigen Zhang State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences

To investigate the seasonal variation of aerosol optical depth （AOD）, extinction coefficient （EXT）, single scattering albedo （SSA） and the decomposed impacts from sulfate （SO42-） and black carbon （BC） over China, numerical experiments are conducted from November 2007 to December 2008 by using WRF-Chem. Comparison of model results with measurements shows that model can reproduce the spatial distribution and seasonal variation of AOD and SSA. Over south China, AOD is largest in spring （0.6-1.2） and lowest in summer （0.2-0.6）. Over north, northeast and east China, AOD is highest in summer while lowest in winter. The high value of EXT under 850 hPa which is the reflection of low visibility ranges from 0.4-0.8 km-1 and the high value area shifts to north during winter, spring and summer, then back to south in autumn. SSA is 0.92-0.94 in winter and 0.94-0.96 for the other three seasons because of highest BC concentration in winter over south China. Over east China, SSA is highest （0.92-0.96） in summer, and 0.88-0.92 during winter, spring and autumn as the concentration of scattering aerosol is highest while BC concentration is lowest in summer over this region. Over north China, SSA is highest （0.9-0.94） in summer and lowest （0.82-0.86） in winter due to the significant variation of aerosol concentration. The SOn2- induced EXT increases about 5%- 55% and the impacts of BC on EXT is much smaller （2%-10%）. The SO42--induced increase in SSA is 0.01-0.08 and the BC-induced SSA decreases 0.02-0.18.

关键词： seasonal variation AOD EXT SSA China WRF-Chem

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Sensitivity analysis of surface ozone to emission controls in Beijing and its neighboring area during the 2008 Olympic Games

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Journal of Environmental Sciences 2012年第1期24卷 50-61页

作者： yi gao Meigen Zhang State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

The regional air quality modeling system RAMS （Regional Atmospheric Modeling System）-CMAQ （Community Multi-scale Air Quality modeling system） is applied to analyze temporal and spatial variations in surface ozone concentration over Beijing and its surrounding region from July to October *** of simulated and observed meteorological elements and concentration of nitrogen oxides （NOx） and ozone at one urban site and three rural sites during Olympic Games show that model can generally reproduce the main observed feature of wind,temperature and ozone,but NOx concentration is *** ozone concentration decreased during Olympics,high ozone episodes occurred on 24 July and 24 August with concentration of 360 and 245 μg/m 3 at Aoyuncun site,*** analysis of sensitive test,with and without emission controls,shows that emission controls could reduce ozone concentration in the afternoon when ozone concentration was highest but increase it at night and in the *** evolution of the weather system during the ozone episodes （24 July and 24 August） indicates that hot and dry air and a stable weak pressure field intensified the production of ozone and allowed it to *** analysis at the urban site and rural site shows that under favorable weather condition on 24 August,horizontal transport was the main contributor of the rural place and the pollution from the higher layer would be transported to the surface *** 24 July,as the wind velocity was smaller,the impact of transport on the rural place was not obvious.

关键词： chemical smoke tropospheric ozone emission control CMAQ process analysis

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Random Weighting Estimation Method for Dynamic Navigation Positioning

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Chinese Journal of Aeronautics 2011年第3期24卷 318-323页

作者： gao Shesheng gao yi ZHONG Yongmin WEI Wenhui School of Automation Northwestern Polytechnical University Xi 'an 710072 China Department of Mechanical Engineering Curtin University WA6845 Australia

This paper presents a new random weighting estimation method for dynamic navigation positioning. This method adopts the concept of random weighting estimation to estimate the covariance matrices of system state noises and observation noises for controlling the disturbances of singular observations and the kinematic model errors. It satisfies the practical requirements of the residual vector and innovation vector to sufficiently utilize observation information, thus weakening the disturbing effect of the kinematic model error and observation model error on the state parameter estimation. Theories and algorithms of random weighting estimation are established for estimating the covariance matrices of observation residual vectors and innovation vec- tors. This random weighting estimation method provides an effective solution for improving the positioning accuracy in dynamic navigation. Experimental results show that compared with the Kalman filtering, the extended Kalman filtering and the adaptive windowing filtering, the proposed method can adaptively determine the covariance matrices of observation error and state error, effectively resist the disturbances caused by system error and observation error, and significantly improve the positioning accu- racy for dynamic navigation.

关键词： estimation navigation error random weighting estimation dynamic navigation positioning covariance matrix kinematic model error observation model error

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Escape and Stand of the Pluto Atmosphere

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Communications in Theoretical Physics 2002年第7期38卷 125-127页

作者： gao Chong-yi School of Physical Science and Technology Lanzhou University Lanzhou 730000 China

Molar mass μmin of the lightest gas, which will exist "forever" in the atmosphere at the planet surface,can be evaluated by Jeans rule. The μmin of Pluto is 17.3 g@ mol-1. It is evident that both N2 and CO can be major atmospheric composition at the Pluto surface, and will exist "forever". CH4 can only be escaping slowly from Pluto atmosphere, and still holds quite a proportion in current Pluto atmosphere. However, it will not escape from Titan (or Jupiter, Saturn) atmosphere largely, and will exist "forever". Given the quantitylevelof partial pressure of CH4 in Pluto and Titan (or Jupiter, Saturn) original atmosphere is the same, it will be clear that the current partial pressure of CH4 in Pluto surface atmosphere is 10-3 Pa.

关键词： planet atmosphere, Pluto atmosphere, Jeans rule, atmospheric composition, escape

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Influence of the Acoustic Liner in Large Eddy Simulation of Longitudinal Thermoacoustic Instability in a Model Annular Combustor

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Journal of Thermal Science 2024年第2期33卷 710-724页

作者： MENG Sheng ZHANG Man gao yi AECC Commercial Aircraft Engine Co. Ltd.Shanghai200241China School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai200240China

Although extensive efforts have been made to dampen the thermoacoustic instability,successfully controlling the pressure oscillations in modern gas turbines or aeroengines remains *** influence of the acoustic liner on the longitudinal thermoacoustic mode in a model annular combustor is investigated by Large Eddy Simulation(LES) in this *** result of the self-excited longitudinal thermoacoustic instability without the liner agrees well with the frequency and acoustic analysis of the pressure mode based on experimental *** different bias flow velocities of the liner located downstream of the combustor are then *** results reveal that the existence of the liner influences not only the acoustic field but also the flow *** the bias velocity is large,it leads to intense turbulence-induced fluctuations,and the pressure oscillation is modulated *** shows that the weak coupling between flow and pressure oscillations plays a significant role in the onset of the intermittency of a thermoacoustic *** on the dynamic analysis of the thermoacoustic system with the acoustic liner,this intermittency is caused by the influence of the flow field on the flame-acoustic ***,a low-order modeling method based on Van der Pol(VdP) oscillator with additive stochastic forcing is conducted to reproduce the evolving dynamics of the thermoacoustic *** the numerical cases demonstrated in this work are relatively simpler than those in a practical combustion system,the results are helpful for us to understand the effect of the acoustic liner and show the attractive potential to apply this device to suppress thermoacoustic instability.

关键词： thermoacoustic instability acoustic liner Large Eddy Simulation low-order modeling

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Spin excitations in nickelate superconductors

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Science China(Physics,Mechanics & Astronomy) 2020年第8期63卷 114-122页

作者： Tao Zhou yi gao ZiDan Wang Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials Guangdong Provincial Engineering Technology Research Center for Quantum Precision MeasurementSchool of Physics and Telecommunication Engineeringand Frontier Research Institute for PhysicsSouth China Normal UniversityGuangzhou 510006China Department of Physics and Institute of Theoretical Physics Nanjing Normal UniversityNanjing 210023China Department of Physics and HKU-UCAS Joint Institute for Theoretical and Computational Physics at Hong Kong The University of Hong KongHong Kong 999077China

Applying a three-band model and the random phase approximation,we theoretically study the spin excitations in nickelate superconductors,which have been newly *** spin excitations were found to be incommensurate in the low energy *** spin resonance phenomenon emerged as the excitation energy *** intensity can be maximized at the incommensurate or commensurate momentum,depending on the out-of-plane *** spin excitations reverted to incommensurate at higher *** also discuss the similarities and differences in the spin excitations of nickelate and cuprate *** predicted results can be later validated in inelastic neutron scattering experiments.

关键词： nickelates superconductivity d-wave pairing spin susceptibility

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SOLVING SYMMETRIC MONOTONE LINEAR VARIATIONAL INEQUALITIES BY SOME MODIFIED LEVITIN-POLYAK PROJECTION METHODS

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Applied Mathematics(A Journal of Chinese Universities) 1998年第2期13卷 150-158页

作者： gao yi Department of Mathematics Nanjing University Nanjing

Abstract Some modified Levitin Polyak projection methods are proposed in this paper for solving monotone linear variational inequalityx∈Ω,(x′-x) T(Hx+c)≤0,\ x′∈Ω.It is pointed out that there are simil... 详细信息

关键词： Variational inequality projection mathod self-adaptive method

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State reconstruction of molecular spatial rotation

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Chinese Physics B 2012年第2期21卷 81-87页

作者： Qin Xiao gao Jun-yi Wuhan Institute of Physics and Mathematics Chinese Academy of SciencesWuhan 430071China Graduate University of the Chinese Academy of Sciences Beijing 100049China

We establish a reconstruction approach for the rotational quantum state of linear molecules possessing a magnetic manifold. Our approximate method contains an iteration with generalized matrix inverses, processing the tomographic integral of the time-dependent molecular-axis distribution in a polar angle. As shown in a simulated example for an alignment state, the density matrix is determined in a high fidelity. An analytic tomographic formula is also derived for the symmetric top rotation. The state coherent in the quantum space of both the angular momentum and its magnetic projection can be approximately retrieved from the observable time-resolved solid-angle distribution of the molecular axis.

关键词： state reconstruction molecular rotation

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