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电网技术 2013年第3期37卷 782-787页

作者：李永明范与舟徐禄文输配电装备及系统安全与新技术国家重点实验室(重庆大学) 重庆市沙坪坝区400044 重庆电力科学试验研究院重庆市渝北区401123

根据铁塔实际结构和导线抛物线方程,建立了铁塔附近三维电场计算模型。基于模拟电荷法分析了500 kV输电线路铁塔周围地面上的工频电场分布,分析了铁塔对其附近电场环境的影响,并讨论了影响电场计算结果的因素。研究结果表明:铁塔对其附... 详细信息

根据铁塔实际结构和导线抛物线方程,建立了铁塔附近三维电场计算模型。基于模拟电荷法分析了500 kV输电线路铁塔周围地面上的工频电场分布,分析了铁塔对其附近电场环境的影响,并讨论了影响电场计算结果的因素。研究结果表明:铁塔对其附近地面电场有一定屏蔽作用,电场强度在铁塔下方显著降低且在金属构架处产生畸变;铁塔的影响范围和铁塔高度及塔基尺寸有关;铁塔构架等效半径、线单元剖分段数以及铁塔不同简化模型都会影响计算结果。

关键词：三维铁塔模型模拟电荷法超高压输电线路工频电场

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相序对特高压交流输电线下工频电磁场影响的仿真分析研究

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高压电器 2015年第3期51卷 82-87页

作者：邹岸新徐禄文国网重庆市电力公司电力科学研究院重庆401123

在实际工程中,特高压交流输电线路为保证三相平衡经常采用变相序的方法进行运行。为掌握相序对特高压交流输电线下工频电磁场的影响情况,笔者以荆门—南阳—晋东南1 000 kV特高压输电线路为例,采用线单元模拟电荷法和基于毕奥—沙伐尔... 详细信息

在实际工程中,特高压交流输电线路为保证三相平衡经常采用变相序的方法进行运行。为掌握相序对特高压交流输电线下工频电磁场的影响情况,笔者以荆门—南阳—晋东南1 000 kV特高压输电线路为例,采用线单元模拟电荷法和基于毕奥—沙伐尔定律的数值计算方法分别对不同相序运行时的工频电场和工频磁场分布情况进行了仿真分析。分析发现:同相序排列时电场强度较大,逆相序排列时电场强度较小,而工频磁场在逆相序排列方式时稍大,在同相序排列方式时较小。

关键词：相序特高压工频电磁场仿真

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3D Simulation of Edge Diffraction of Sound Barrier in Substation

3D Simulation of Edge Diffraction of Sound Barrier in Substa...

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Energy, Power and Grid (ICEPG), International Conference on

作者： Yuxin Zhou Quanye Ou luwen xu Guangming Wang State Grid Chongqing Electric Power Research Institute Chongqing China School of Marine Science and Technology Northwestern Polytechnical University Xi’an China

ISBN: (数字)9798350377798

ISBN: (纸本)9798350377804

With the development of urbanization, substations have started to be built in urban areas where the population is concentrated. In order to effectively control the noise pollution from substations, sound barriers are built inside the substations to block the propagation of noise, so the sound insulation value of the sound barriers becomes an important indicator. However, the edge diffraction phenomenon will lead to errors between the real sound attenuation and the laboratory measurement value. The classical geometrical diffraction theory is a commonly used method to estimate the sound attenuation from edge of the barrier. However, it is a 2D model which cannot be used for 3D problem. In order to correctly estimate the sound attenuation in a 3D environment, this paper conducts relevant research. Firstly, it investigates the influencing factors of sound attenuation caused by the edge diffraction. Then, a 3D simulation model based on the classical 2D geometric diffraction theory is proposed. The accuracy of the model is verified by simulation test and experimental test for barriers with different shapes. The results show that the model is capable of giving satisfied estimations of the edge diffraction from the sound barrier in substation.

关键词： Solid modeling Substations Three-dimensional displays Pollution Diffraction Shape Noise Urban areas Attenuation Pollution measurement

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Performance Comparison of GPU-Accelerated Fast Motion Estimation Method

Performance Comparison of GPU-Accelerated Fast Motion Estima...

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IEEE International Conference on Big Data and Cloud Computing (BdCloud)

作者： Pengcheng Chen Bo Peng Anxin Zou luwen xu School of Computer Science Southwest Petroleum University Chengdu China Chongqing Electric Power Company Electric Power Research Institute Chongqing China

ISBN: (数字)9781728143286

ISBN: (纸本)9781728143293

Motion estimation is an important part of ultrasound strain elastography. The sum-table based motion estimation method, which can effectively reduce computation time and redundant calculation, is a fast motion estimation approach. Except for NCC, it can also be extended to other motion estimators. The main work and contribution of this paper is to implement different motion estimators (CC, NCC, SSD, SAD) on GPU platform based on the sum-table method and to compare the performance of these motion estimators with the classical method on GPU. The difference of computational cost of each estimator based on the sum-table method mainly lies in the construction of the sum-table. The computation burden per thread is small, so data addressing is the dominant work per thread. It has been reported that the sum-table method does not have particular advantage over the classical method with a large search range on GPU platform. However, it possesses good performance with a huge tracking kernel window.

关键词： Microsoft Windows Graphics processing units Motion estimation Ultrasonic imaging Estimation Elastography Computational efficiency

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变电站内建筑物工频电场仿真分析与优化

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高电压技术 2015年第1期41卷 294-299页

作者：李永明罗鹏徐禄文秦广重庆大学输配电装备及系统安全与新技术国家重点实验室重庆400030 重庆电力科学试验研究院重庆401123

为深入研究变电站内工频电场在有无考虑站内建筑物情况时的分布情况,以500 kV变电站为例,在CDEGS软件环境下对变电站内电气设备和建筑物进行建模并进行工频电场分布的仿真计算。通过仿真结果与实测结果的对比,验证了所建模型的正确性。... 详细信息

为深入研究变电站内工频电场在有无考虑站内建筑物情况时的分布情况,以500 kV变电站为例,在CDEGS软件环境下对变电站内电气设备和建筑物进行建模并进行工频电场分布的仿真计算。通过仿真结果与实测结果的对比,验证了所建模型的正确性。接着分析了变电站内有建筑物时的工频电场分布情况。结果表明500 kV变电站的工频电场强度较大值主要集中在导线交叉与靠近开关场外侧导线附近,站内的建筑物使其周围的工频电场发生较大畸变,随着建筑物高度的增加、离开关场越近,其畸变越严重。并进一步提出将变电站设备基座整体升高1.2 m可有效降低站内工频电场强度。

关键词： 500kV变电站 CDEGS软件工频电场站内建筑畸变电场:电场改善

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Research on Electric Field of High-Voltage Transmission Line Power Frequency

Research on Electric Field of High-Voltage Transmission Line...

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International Conference on Power System Technology (POWERCON)

作者： luwen xu Yongming Li Jihui Yu Xingzhe Hou Changping An Chongqing Electric Power Corporation Chongqing China Key Laboratory of High Voltage Engineering & Elec. New Technology Ministry of EducationElec. Eng College at Chongqing University Chongqing China

This paper presents a model for computing power frequency electromagnetic field of overhead high voltage transmission line based on simulation charge method. Based on this model, the electric field intensity under power line is calculated and the distribution is analyzed in different condition such as different distant between phase line, different phase order for double circuit, and different arrangement of line in single circuit or double circuit. According to the simulation results, the electric fields under overhead transmission line can be forecast. This is no doubt important in environment protection and available in the design of transmission line.

关键词： Power transmission lines Frequency Distributed parameter circuits Circuit simulation Electromagnetic modeling Electromagnetic fields Voltage Power overhead lines Computational modeling Predictive models

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Study on the Three Dimension Attenuated Model and the Algorithm of Environmental Noise in Substations

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中国电机工程学报 2012年第13期32卷 I0024-I0024,207页

作者： xu luwen LIU Xiaoling Chongqing Electric Power Research Institute Southwest Petroleum University

为了准确计算变电站噪声对周边环境影响的大小，通过对噪声衰减理论和变电站环境特点的分析，建立了变电站仿真数学模型，并基于该模型提出了变电站三维空间噪声预测算法。噪声衰减计算中，最复杂的是求解几何衰减中菲涅耳数，而求解菲... 详细信息

为了准确计算变电站噪声对周边环境影响的大小，通过对噪声衰减理论和变电站环境特点的分析，建立了变电站仿真数学模型，并基于该模型提出了变电站三维空间噪声预测算法。噪声衰减计算中，最复杂的是求解几何衰减中菲涅耳数，而求解菲涅耳数的关键是求解绕射声的声程差，利用凸包算法求解变电站内多声源、多障碍等复杂场景的声程差问题。仿真计算结果与实测结果对比显示，该模型和算法能够准确预测变电站周边三维空间中任意位置的噪声大小，为开展变电站环境噪声预评价、新建变电站规划设计中噪声控制优化以及运行变电站噪声的工程治理方案优化等提供技术支持和理论依据。

关键词：城市变电站环境噪声三维模型算法弱毒中国经济噪声分析

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Development and simulation evaluation of a magnetorheological elastomer isolator for transformer vibration control

Development and simulation evaluation of a magnetorheologica...

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第30届中国控制与决策会议

作者： luwen xu Anxin Zou Jie Fu Miao Yu Junfeng Bai Electric Power Research Institute of Chongqing Electric Power Company Key Lab for Optoelectronic Technology and Systems Ministry of Education College of Optoelectronic Engineering Chongqing University

Vibration generated by the large power transformer has a harmful effect on the surrounding buildings and environment as a consequence of structure-borne propagation or air noise, and impacts on the stability and service life of precision machinery within the substation. Now, the study of vibration of transformer and related vibration isolation technology has attracted more and more attention by power supply departments and relevant transformer manufacturing enterprises. To decrease the transformer vibration. This paper investigated the ON-OFF controller for transformer vibration isolation system. Firstly, the performance of the vertical magnetorheological elastomer(MRE) isolator is evaluated by sweep frequency test. Then ON-OFF controller designed and applied to control isolator. Finally, numerical simulations with multi-frequency excitations are conducted to verify the effectiveness of the controller. The ON-OFF controller and passive controller are compared at base and the bottom of transformer in response displacement to demonstrate the effectiveness and superiority of ON-OFF controller.

关键词： transformer magnetorheological elastomer(MRE) isolator ON-OFF controller

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高压交流输电线路下方有限大金属屏蔽网的电场屏蔽效能

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南方电网技术 2021年第10期15卷 26-31页

作者：徐禄文杨勃刘彤国网重庆市电力公司电力科学研究院重庆401123 电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系) 北京100084

当高压交流输电线路下方电场强度超过标准限值时候,通常采用接地金属屏蔽网降低电场强度。研究了有限大小金属屏蔽网的屏蔽效能的计算方法,该方法更符合屏蔽网现实使用场景要求。在此基础上,得出了屏蔽网布置方式、屏蔽导体密度和屏蔽... 详细信息

当高压交流输电线路下方电场强度超过标准限值时候,通常采用接地金属屏蔽网降低电场强度。研究了有限大小金属屏蔽网的屏蔽效能的计算方法,该方法更符合屏蔽网现实使用场景要求。在此基础上,得出了屏蔽网布置方式、屏蔽导体密度和屏蔽导体粗细等因素对屏蔽效能的影响规律。结果表明,对有限大屏蔽网屏蔽效能影响最大的因素是屏蔽网的密度,而屏蔽导体布置方式和屏蔽导体的粗细对屏蔽效能的影响不大。研究成果可为屏蔽网的布置和设计提供技术支撑。

关键词：模拟电荷法屏蔽网输电线路电场

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An approach for calculating ion flow in HVDC transmission line based on algebraic multi-grid method

An approach for calculating ion flow in HVDC transmission li...

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20th International Conference on AC and DC Power Transmission 2024 (ACDC 2024)

作者： YuXin Zhou DaRan xu GuangMing Wang luwen xu JiaHe Hao QiWen Cheng Jun Zou State Grid Chongqing Electric Power Research Institute Chongqing 401123 People's Republic of China Chongqing Power Transmission & Transformation Engineering Co.Ltd. Chongqing 400030 People's Republic of China Electrical Engineering Department Tsinghua University Beijing 100084 People's Republic of China

ISBN: (数字)9781837241552

As the geometric configuration and physical model of HVDC transmission lines become more complex, the solver increasingly becomes a performance bottleneck in research on ion flow field problems. The preconditioner is a key component for the performance of iterative solvers. Although the algebraic multigrid method is proven to be an optimal preconditioner for elliptic equations, it results in significant stability issues when applied to convection-dominated transport equations. In this work, the algebraic multigrid method employing an approximate ideal restriction operator is applied to solve the transport equation arising in ion flow field problems. Compared to the classical algebraic multigrid method, the Petrov-Galerkin algebraic multigrid method demonstrates good performance in solving the transport equation for ion flow field simulations. This improvement helps address the large-scale electromagnetic environment issues of HVDC transmission lines.

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