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2023 6th International Conference on Energy, Electrical and Power Engineering (CEEPE)最新文献

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A Permeability Model of Fractal Porous Media Composed of Arbitrary Shape Capillaries Based on Monte Carlo Simulation 基于蒙特卡罗模拟的任意形状毛细血管分形多孔介质渗透率模型
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10165874
Shihong Qi, Di Yu, B. Niu, Yinglin Li
The permeability plays a vital role in describing the Newtonian fluids in fractal porous media. Assuming that porous media consist of capillaries only with single cross-sectional shape doesn't concur with real situations, and most porous media in nature are tremendously complex and consist of numerous tortuous capillaries/pores with various cross-sectional shapes. This paper derives a general permeability model of porous media composed of capillaries with mixed cross-sectional shapes and compares the predicting results of permeability by the present model with those by the previous models and experiment data of previous studies. The analysis results indicate that there is an optimal cross-sectional proportion of mixed shapes for the pores/capillaries in the porous media.
渗透率在描述分形多孔介质中的牛顿流体中起着至关重要的作用。假设多孔介质仅由单一横截面形状的毛细血管组成是不符合实际情况的,自然界中大多数多孔介质极其复杂,由众多横截面形状各异的弯曲毛细血管/孔隙组成。本文推导了由混合截面形状的毛细血管组成的多孔介质的一般渗透率模型,并将该模型的渗透率预测结果与以往的模型和实验数据进行了比较。分析结果表明,多孔介质中孔隙/毛细血管的混合形状截面比例存在最佳值。
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引用次数: 0
Discrete Bound Constrained Distribution Based Regional Integrated Energy System Capacity Allocation Model 基于离散约束约束分布的区域综合能源系统容量分配模型
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10165886
Zhichao Qin, R. Zhou, Yiming Ren, Jincheng Li
The stochastic nature of the cooling and heating power loads and new energy power output in the regional integrated energy system leads to the difficulty of predicting their stochastic distribution characteristics and parameters during planning. Therefore, a discrete bounded constrained distribution method is used to solve the problem of uncertainty of stochastic distribution in their optimal allocation. A capacity allocation model of regional integrated energy system with discrete bounded distribution is established, and the model is converted into a deterministic semi-deterministic plan by Lagrangian dual principle. The simulation results show that although the investment and operation costs increase after considering the discrete bound constraint distribution, the load shedding loss is reduced to a certain extent; while the total system cost increases with the increase of the discrete bound perturbation range, the supply and sale of energy of the system is guaranteed, which is economical and reliable.
区域综合能源系统冷热负荷和新能源输出的随机性,导致规划时难以预测其随机分布特征和参数。因此,采用一种离散有界约束分布方法来解决其最优分配中随机分布的不确定性问题。建立了具有离散有界分布的区域综合能源系统容量分配模型,并利用拉格朗日对偶原理将该模型转化为确定性的半确定性规划。仿真结果表明,考虑离散约束分布后,虽然投资和运行成本增加,但减载损失在一定程度上有所降低;在系统总成本随着离散界摄动范围的增大而增大的同时,保证了系统的能量供应和销售,经济可靠。
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引用次数: 0
Simulation of Press-Pack IGBT Unit in Phase Change Cooling Materials 相变冷却材料中压包式IGBT装置的模拟
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10165970
Qing Li, Liming Wang, F. Yin
Phase change cooling technology has gradually become a solution to the heat dissipation bottleneck of high-voltage power electronic devices. The research object of this paper is the press-pack IGBT unit. The finite element simulation method is used to simulate the overall heat dissipation of the press-pack IGBT unit when it is placed in the air and immersed in the PCM. Moreover, the junction temperature change of the IGBT chip is analyzed. It is concluded that compared with the chip junction temperature of the press-pack IGBT unit in the air, the chip junction temperature under PCM immersion is much lower and the chip surface temperature is more uniform, which indicates that the phase-change cooling material has a better heat dissipation effect.
相变冷却技术已逐渐成为解决高压电力电子器件散热瓶颈的一种方法。本文的研究对象是压装式IGBT装置。采用有限元模拟方法,对压包式IGBT装置置于空气中并浸入PCM时的整体散热进行了模拟。此外,还分析了IGBT芯片的结温变化。结果表明,与空气中压包式IGBT单元的芯片结温相比,PCM浸泡下的芯片结温要低得多,芯片表面温度更加均匀,表明相变冷却材料具有更好的散热效果。
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引用次数: 0
Application of Improved Latin Hypercube Sampling in Reliability Assessment of Generation and Transmission Systems 改进拉丁超立方抽样在发输电系统可靠性评估中的应用
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10167008
Hui Xiao, Jiannan Ouyang, Shan Li, Zhidu Huang
An improved Latin hypercube sampling method is proposed to solve the problems of low computational efficiency and the correlation between computational time, amount of computation, and evaluation accuracy in the sequential Monte Carlo simulation for reliability evaluation of generation and transmission systems. The optimal multiplier is used to modify the approximate optimal parameter distribution of the system, and then sequential Latin hypercube sampling is performed to obtain the state duration time series of elements and systems. This method further reduces sample variance and improves sampling efficiency on the basis of conventional Latin hypercube sampling, solves the correlation problem between the computational efficiency and evaluation accuracy of the sequential Monte Carlo simulation effectively. Apply this method to evaluate the reliability of IEEE-RTS 79 test systems and high reliability systems, the results show that the proposed method has faster convergence speed, less computational effort, and less computational time, and has good applicability in high reliability systems.
针对输配电系统可靠性评估序贯蒙特卡罗仿真中计算效率低、计算时间、计算量与评估精度之间存在相关性的问题,提出了一种改进的拉丁超立方体采样方法。利用最优乘子对系统的近似最优参数分布进行修正,然后进行序贯拉丁超立方采样,得到单元和系统的状态持续时间序列。该方法在传统拉丁超立方采样的基础上进一步减小了样本方差,提高了采样效率,有效地解决了序贯蒙特卡罗模拟计算效率与评估精度之间的相关性问题。将该方法应用于IEEE-RTS 79测试系统和高可靠性系统的可靠性评估,结果表明,该方法具有更快的收敛速度、更少的计算量和更少的计算时间,对高可靠性系统具有良好的适用性。
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引用次数: 0
Statistical Analysis of VFTO Time Domain Modal Parameters VFTO时域模态参数统计分析
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10167222
Qi Wang, K. He, Yue Tong, F. Chu
The phenomenon of very fast transient overvoltage (VFTO) is a matter of significant concern in industry. In view of the fact that VFTO lacks the overall identification of time-frequency domain parameters and statistical characteristic analysis. A time-domain identification method combining the singular value decomposition (SVD) and the ESPRIT is proposed. Based on the measured VFTO waveforms obtained from the 220 kV GIS experimental platform, the proposed method is used to obtain the modal parameters of each harmonic component of the VFTO, including subharmonic amplitude, frequency, decay factor and initial phase angle. Further, the mean and variance of each mode parameter with normal distribution are obtained by parameter estimation, and the correlation between subharmonic amplitude and breakdown voltage is analyzed to establish the reconstruction model of VFTO transient waveforms under different breakdown voltages. the effectiveness of the proposed method is verified by comparing the test set.
快速瞬态过电压(VFTO)现象是工业上一个值得关注的问题。鉴于VFTO缺乏时频域参数的整体辨识和统计特性分析。提出了一种将奇异值分解(SVD)和ESPRIT相结合的时域识别方法。该方法基于220 kV GIS实验平台获得的VFTO实测波形,获得了VFTO各谐波分量的模态参数,包括次谐波幅度、频率、衰减因子和初始相位角。进一步,通过参数估计得到各模态参数的均值和方差服从正态分布,分析次谐波幅值与击穿电压的相关性,建立不同击穿电压下VFTO暂态波形的重构模型。通过对比测试集,验证了该方法的有效性。
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引用次数: 0
Operation Optimization for Multiple Regional Integrated Energy Systems Based on Model Predictive Control under Cloud-Edge Cooperation 云边缘协同下基于模型预测控制的多区域集成能源系统运行优化
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10167159
Chun Liu, Yan Cheng, Hangwei Zha
To make full use of the complementary potential of energy resources between different regional integrated energy systems (RIESs), this paper constructs a two-level operation optimization model under cloud-edge cooperation for multiple RIESs from the multi-level structure concept. Firstly, a real-time optimization model is built on the cloud platform of energy management to optimize the system overall economy, which meets the demand for power interaction in the day. Secondly, at each edge node, the model predictive control (MPC) is used to establish a refined energy control model based on the prediction analysis of each RIES's renewable energy generation and loads demand. Finally, the simulation verifies the feasibility of the cloud-edge coordinated control energy optimization in the real-time phase. Compared to traditional centralized control, the proposed method solves the problem of balancing the individual benefits of each RIES with the overall benefits of the system.
为了充分利用不同区域综合能源系统之间的能源资源互补潜力,本文从多层次结构概念出发,构建了云边缘协同下多个区域综合能源系统的两级运行优化模型。首先,在能源管理云平台上建立实时优化模型,优化系统整体经济性,满足日间电力交互需求;其次,在每个边缘节点上,基于对各节点可再生能源发电和负荷需求的预测分析,采用模型预测控制(MPC)方法建立精细化的能量控制模型;最后,通过仿真验证了实时阶段云边缘协调控制能量优化的可行性。与传统的集中控制方法相比,该方法解决了各节点个体利益与系统整体利益的平衡问题。
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引用次数: 0
Autonomous Patrol Technology and System on Leapfrog-Type Charging UAV - Automatic Charging Control based on Machine Vision 跨越式充电无人机自主巡逻技术与系统——基于机器视觉的自动充电控制
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10167061
Jiahua Guan, Jiahao Lu, Yaofeng Jian, Zitian Mai, Zhihao Li, Haojun Chen, Donglun Li, Qiting Zheng
Rotor-craft unmanned aerial vehicle (UAV) has been applied rapidly in the domestic electric power system. However, endurance time of the drone loaded with equipment is limited in 20 minutes. Therefore, this paper proposes a key technology of automatic leapfrog-type charging control based on machine vision. Leapfrog-type charging platform is composed of UAV platform, UAV automatic charging platform and ground control system. According to both flight control and intelligent control, with the aid of machine vision and image recognition technology on positioning and intelligent landing UAV with high precision, and effective docking of preset slots and charging interfaces between ground charging platform and UAV, the battery of UAV charges automatically reliably, so as to realize the take-off and landing and automatically recharging UAV. The experimental results show that the problem of high precision positioning in charging process of UAV is effectively solved by implementing the leapfrog charging platform, machine vision, image recognition and shutdown technology.
旋翼无人机在国内电力系统中得到了迅速的应用。但是,装载设备的无人机的续航时间限制在20分钟以内。为此,本文提出了一种基于机器视觉的跨越式自动上料控制关键技术。跨越式充电平台由无人机平台、无人机自动充电平台和地面控制系统组成。根据飞行控制和智能控制两方面的要求,借助机器视觉和图像识别技术对无人机进行高精度定位和智能着陆,并有效对接地面充电平台与无人机之间的预设槽位和充电接口,对无人机电池进行可靠自动充电,实现无人机起降自动充电。实验结果表明,通过实现跨越式充电平台、机器视觉、图像识别和关机技术,有效解决了无人机充电过程中的高精度定位问题。
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引用次数: 0
The Successive Inverter Commutation Failures Near Generator Oscillation Center and Countermeasures 发电机振荡中心附近逆变器连续换相故障及对策
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10166641
Yilang Jiang, Yi Han, Qiyu Chen, Xueqiong Wang, Chenchen Yu, Jing Cai
In this paper, a novel risk of successive commutation failures near oscillation center has been put forward, and it can be explained by marvelous generator swing. Accordingly, the countermeasures are put forward, they are generator tripping (as stability control) and AC network promotion, respectively. Finally, the effectiveness of these two measures are demonstrated and validated in numerical illustrations.
本文提出了一种新的在振荡中心附近连续换相失效的风险,并用发电机的巨大摆动来解释这种风险。据此,提出了发电机脱扣(作为稳定控制)和交流网络提升的对策。最后,通过数值算例验证了这两种措施的有效性。
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引用次数: 0
A Smart Contract-Based Microgrid Large-Scale Electricity Trading System 基于智能合约的微电网大规模电力交易系统
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10166390
Zaoxian Zheng, Zhenghao Qian, Ye Liu, Hui Li, Hongwen Guo, Xinxin Wu
With the development of distributed energy resources (DERs) and microgrids, the traditional electricity trading system based on centralized models is no longer suitable for the current energy market. To address this issue, in this paper, we propose a smart contract-based large-scale power trading system for microgrids. To do this, we first model the two-tier large-scale power trading system of the microgrid, then use the Hungarian algorithm to match the power transactions, and package all the power transactions into a blockchain transaction once they are completed via smart contracts. Finally, a simulation experiment is conducted to demonstrate that the proposed algorithm can effectively reduce the time taken for power transactions.
随着分布式能源和微电网的发展,传统的基于集中式模式的电力交易系统已经不适应当前的能源市场。为了解决这一问题,本文提出了一种基于智能合约的微电网大规模电力交易系统。为此,我们首先对微电网的双层大规模电力交易系统进行建模,然后使用匈牙利算法匹配电力交易,并在通过智能合约完成后将所有电力交易打包成区块链交易。最后,通过仿真实验验证了该算法能够有效地缩短电力事务处理时间。
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引用次数: 0
Research on Simulation and Verification Experiment Method for Pressure Characteristics of Converter Transformer Tank under Internal Arc Fault 换流变压器油箱内弧故障压力特性仿真与验证实验方法研究
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10166954
Z. Pan, J. Deng, Zhicheng Xie, Xiang Peng, Mingchun Hou, Haibin Zhou
Internal electrical fault of converter transformer may generally cause high-energy arc. Internal arc fault will lead to rapidly increasing dynamic oil pressure and tank rupture. The leakage of oil with leakage high temperature may cause fire. Whether the mechanical strength of the tank for converter transformer can withstand this dynamic oil pressure is the decisive factor to determine whether a fire may occurs. In this paper, the mechanical characteristics, such as mechanical stress and deformation of the tank under internal arc fault are simulated and analyzed by FEM method, and some technical measures, such as flexible oil tank, to reduce the probability of tank rupture are proposed. Meanwhile, this paper puts forward a verification test method of mechanical strength of the tank for converter transformer based on arc test in the transformer oil.
换流变压器内部电气故障一般会引起高能电弧。内弧故障会导致动油压迅速升高,导致油罐破裂。泄漏温度高的油的泄漏可能引起火灾。换流变压器油箱的机械强度能否承受这种动油压,是决定是否发生火灾的决定性因素。本文采用有限元法模拟分析了内弧故障作用下油罐的机械应力和变形等力学特性,并提出了采用柔性油罐等技术措施来降低油罐破裂的概率。同时,提出了一种基于变压器油中电弧试验的换流变压器油箱机械强度验证试验方法。
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引用次数: 0
期刊
2023 6th International Conference on Energy, Electrical and Power Engineering (CEEPE)
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