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

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Quantitative Analysis of Oscillation Propagation in MMC-HVDC System MMC-HVDC系统振荡传播的定量分析
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10167356
X. Zou, Qiang Li, Chenggen Wang, B. Ren
High voltage direct current (HVDC) transmission system with modular multilevel converter (MMC) as converter station has been widely used in engineering. However, when MMC is connected with weak power grid or new energy station, it may induce broadband oscillation events. It is necessary to understand the propagation of broadband oscillations in the system in order to monitor the oscillation events in MMC-HVDC system. In this paper, firstly, the mechanism of oscillation propagation in MMC is analyzed qualitatively, and then the 3x3 admittance matrix which describe oscillation propagation quantitatively is derived. Finally, the method of quantitative analysis of oscillation propagation in MMC-HVDC system is introduced with a case in Matlab/Simulink.
以模块化多电平变流器(MMC)作为换流站的高压直流输电系统在工程中得到了广泛的应用。然而,当MMC与弱电网或新能源电站连接时,可能会引发宽带振荡事件。为了监测MMC-HVDC系统的振荡事件,有必要了解宽带振荡在系统中的传播。本文首先定性地分析了MMC中振荡传播的机理,然后导出了定量描述振荡传播的3x3导纳矩阵。最后,以Matlab/Simulink为例,介绍了MMC-HVDC系统振荡传播的定量分析方法。
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引用次数: 0
Negative Heat Capacity: Inapplicable IEC Standard to High-voltage Cable with Large Cross-sections 负热容量:IEC标准不适用于大截面高压电缆
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10166440
J. Wen, Han Zhang, Xiaofeng Wang, Canshu Qiu, Gang Yang, Yanqi Zeng, Hongyi Zhong, Gang Liu
Experiment of this paper, with respect to temperature rising, was carried out on two cables with a sectional area of 2500 mm2, and the thermal capacity parameters of the cable were inversely calculated using the collected temperature data of each layer of the cable, and the characteristic curve of thermal capacity changing with temperature was drawn. The characteristic curve indicates that the thermal capacity parameters of the cable tend to have negative values, which is due to the IEC standard is inapplicable to accurately calculation of the heat flow of the cable with a sectional area of more than 1600 mm2. Therefore, it can be inferred that the calorific value of cable core is less than the actual calorific value. The discovery of this phenomenon will greatly affect the dynamic load calculation and evaluation of large-capacity transmission cable lines. More research needs to be invested to solve this problem.
本文对两根截面积为2500mm2的电缆进行了温升实验,利用采集到的电缆各层温度数据反算出电缆的热容量参数,并绘制出热容量随温度变化的特征曲线。特性曲线表明,电缆的热容量参数趋于负值,这是由于IEC标准不适用于准确计算截面积大于1600 mm2的电缆的热流。因此可以推断,电缆芯的发热量小于实际发热量。这一现象的发现将对大容量输电电缆线路的动负荷计算和评估产生重大影响。需要投入更多的研究来解决这个问题。
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引用次数: 0
Research on BIM Model Construction Method of Cable Engineering Based on Parametric Modeling 基于参数化建模的电缆工程BIM模型构建方法研究
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10166160
Jian Wang, Jialun Yang, Danyu Li, Huan Jin, Yi Wang
The characteristics of 3D digital model of cable engineering are analyzed. In view of the difference of the model in the infrastructure operation and inspection stage. For the necessity of local update, the parametric modeling method is analyzed to update and manage the model. The model is saved in the form of family library, including cable engineering model with adjustable parameters and prefabricated model that needs manual adjustment. The model is constructed as a whole by combining the location, orientation and other attributes of each model unit in the form of assembly. The proposed method improve the efficiency of model display and rendering, and can realistically display the site conditions.
分析了电缆工程三维数字模型的特点。针对基础设施运行和巡检阶段的模型差异。针对局部更新的必要性,分析了参数化建模方法对模型的更新和管理。模型以家族库的形式保存,包括参数可调的电缆工程模型和需要人工调节的预制模型。将各个模型单元的位置、方位等属性以装配的形式组合成一个整体来构建模型。该方法提高了模型显示和渲染的效率,能够真实地显示现场情况。
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引用次数: 0
A Metal Object Detection System for Electric Vehicle Wireless Charging System Based on Strip Multi-polar Detection Coils 基于条形多极检测线圈的电动汽车无线充电金属物体检测系统
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10167105
Hui Wang, Yuanchao Wu, Zhiwei Shen, Wenbin Pan, Yiming Zhang
A common and urgent problem in electric vehicle wireless charging technology is the accidental entry of metal objects into the charging area where there is no direct physical contact. Eddy currents can be induced in the metal objects, generating a large amount of heat and potentially leading to serious consequences such as fire. The current commercially applied metal object detection technology has the problems of low detection sensitivity, affecting the power transmission magnetic field, and the existence of blind zones. In view of these shortcomings, a metal object detection system for wireless charging of electric vehicles is proposed in this paper. Long strip detection coils are designed and placed above the transmitter coil. Each strip detection coil is composed of 16 unipolar coils having alternating polarities, which can realize decoupling between the detection coil and the transmitter coil and eliminate the interference to the magnetic field of the wireless power transmission system. A third-order Sallen-Key high pass filter and a proportional amplifier circuit are used to improve the sensitivity and accuracy of metal object detection. Finally, an experimental platform of metal object detection for electric vehicle wireless charging is built, and the proposed system can detect the existence of metal objects sensitively and accurately at the location where they may exist.
在电动汽车无线充电技术中,金属物体意外进入没有直接物理接触的充电区域是一个常见而紧迫的问题。涡流可以在金属物体中产生,产生大量的热量,并可能导致严重的后果,如火灾。目前商业应用的金属物体探测技术存在探测灵敏度低、影响电力传输磁场、存在盲区等问题。针对这些不足,本文提出了一种用于电动汽车无线充电的金属物体检测系统。设计长条检测线圈,置于发射线圈上方。每个条带检测线圈由16个极性交变的单极线圈组成,可以实现检测线圈与发射线圈的去耦,消除对无线电力传输系统磁场的干扰。采用三阶萨伦键通滤波器和比例放大电路,提高了金属物体检测的灵敏度和精度。最后,搭建了用于电动汽车无线充电的金属物体检测实验平台,该系统能够在金属物体可能存在的位置灵敏、准确地检测出金属物体的存在。
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引用次数: 0
Isolated Weinberg Converter for Anode Power Supply with Zero Voltage Switching 零电压开关阳极电源隔离式温伯格变换器
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10166116
Ying Shen, Tao Liu, Zhiqi Lu, Zirui Zhu, Beinan Fu, Congrang Jiang
This paper studies the application of an isolated Weinberg topology in the anode power supply of the Hall electric propulsion system. In the overlapping mode, the resonance of parasitic capacitor and inductors leads to the drain-source voltage of transistors dropping to zero naturally. The resonant circuit and soft-switching constraint are analyzed in detail, a method for accurate calculation of the switching frequency is proposed, the main circuit parameters are designed, and a control scheme of dual-mode switching between PFM and PWM is adopted. The simulation results show that with reasonable parameter design and control strategy, the isolated Weinberg converter can realize ZVS of the primary transistors and ZCS of the secondary diodes without adding any auxiliary components, which is conducive to reducing the size and weight of PPU.
本文研究了隔离温伯格拓扑在霍尔电力推进系统阳极电源中的应用。在重叠模式下,寄生电容和电感的共振导致晶体管的漏源极电压自然降至零。详细分析了谐振电路和软开关约束,提出了精确计算开关频率的方法,设计了主电路参数,采用了PFM与PWM双模切换的控制方案。仿真结果表明,通过合理的参数设计和控制策略,隔离型温伯格变换器可以在不增加任何辅助元件的情况下实现主晶体管的零电压转换和二次二极管的零电压转换,有利于减小PPU的尺寸和重量。
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引用次数: 0
Calculation and Control of Reactive Power Support Capacity of DFIG Based on Cloud Model 基于云模型的DFIG无功容量计算与控制
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10166297
Yazhou Lv, Zhaowei Li, Zhaohui Qie, Fusuo Liu, Wei Li, Zhe Jiang, Kang Zhao
With the construction of the new power system, the installed proportion of the traditional synchronous generator continues to decline, and the stability of the grid voltage is greatly challenged. The participation of wind power in the emergency reactive power control after grid failure is faced with an urgent need. Aiming at the problem that it is difficult to take into account both the ontology constraint and the active power uncertainty constraint when the doubly-fed induction generator participates in the emergency reactive power control of the power grid, the influence mechanism of different reactive power output modes of the DFIG on the system reactive voltage sensitivity is analyzed, and the emergency reactive power support capacity of the wind power is divided into two levels: the turbine ontology constraint and the active power uncertainty constraint, The cloud model entropy is used to quantitatively describe the probability and uncertainty of wind farm output power, so as to determine the limit of reactive power support capacity of wind farm in real time. When the power grid is subject to voltage disturbance, the maximum reactive voltage support can be implemented to reduce the system transient overvoltage or low voltage without affecting the consumption of clean energy. It is verified by the simulation of the actual power grid.
随着新型电力系统的建设,传统同步发电机的安装比例不断下降,电网电压的稳定性受到极大挑战。风电参与电网故障后应急无功控制面临着迫切的需求。针对双馈感应发电机参与电网应急无功控制时难以兼顾本体约束和有功不确定性约束的问题,分析了双馈双馈发电机不同无功输出方式对系统无功电压灵敏度的影响机理,并将风电应急无功支持能力分为两个层次:结合风机本体约束和有功功率不确定性约束,利用云模型熵定量描述风电场输出功率的概率和不确定性,实时确定风电场的无功支持能力极限。当电网受到电压扰动时,可在不影响清洁能源消耗的前提下,实施最大无功电压支撑,降低系统暂态过电压或低压。通过对实际电网的仿真验证了该方法的有效性。
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引用次数: 0
Research on Optimal Allocation Method of Energy Storage Devices for Coordinated Wind and Solar Power Generation 风电与太阳能协同发电储能装置优化配置方法研究
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10166239
Haiyun Wang, Xijuan Yu, Qian Chen, Fangyu Wang
Reasonable planning of energy storage device capacity is the basis for efficient utilization of new energy in large-scale regional power grid. This paper first analyzes the operation characteristics of wind turbines, photovoltaic generators and storage batteries, and establishes an energy storage device capacity optimization model that takes into account the minimum total cost of investment, construction and operation, the minimum transmission power fluctuation of distribution network installation nodes, the node voltage offset and the minimum network power loss as the coordination of wind and solar energy storage, Then an improved discrete PSO algorithm is proposed to optimize the power generation system and obtain the optimized configuration of solar and solar storage capacity. Finally, the feasibility and practicability of the proposed model and method are verified by the actual power grid simulation.
储能装置容量的合理规划是大规模区域电网高效利用新能源的基础。本文首先分析了风力发电机组、光伏发电机组和蓄电池的运行特点,建立了以投资、建设和运行总成本最小、配电网安装节点传输功率波动最小、节点电压偏移和网络损耗最小为风能和太阳能储能协调的储能设备容量优化模型;然后提出一种改进的离散粒子群算法对发电系统进行优化,得到太阳能和太阳能储能的最优配置。最后,通过实际电网仿真验证了所提模型和方法的可行性和实用性。
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引用次数: 0
A P2P Electricity Trading System by Integrating Blockchain with Optimization 区块链与优化相结合的P2P电力交易系统
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10167053
J. Zhang, Hongxing Ye
With numerous distributed energy sources as participants, blockchain shows great potential in the peer-to-peer electricity markets. However, blockchain originally is designed for finical system, and are not fully suitable for cyber-physical systems. This paper proposes a P2P power trading method, in which an optimal solution proof mechanism is designed. It combines the consensus mechanism with the optimization problems of the physical system which are difficult to solve but easy to verify, saving computing power therefore. Meanwhile, we redesign the blockchain structure. The power grid operation status is recorded in the block body, so that the link between blockchains is integrated into the physical state transfer constraints. As for the trading mechanism, a real-time transaction mechanism based on smart contract is proposed according to the mechanism and mode of energy trading. The simulation of transactions in a decentralized power trading system validates the proposed power trading method.
有了众多分布式能源作为参与者,区块链在点对点电力市场显示出巨大的潜力。然而,区块链最初是为金融系统设计的,并不完全适合网络物理系统。提出了一种P2P电力交易方法,该方法设计了最优解证明机制。它将共识机制与难以解决但易于验证的物理系统优化问题相结合,从而节省了计算能力。同时,我们重新设计了区块链结构。将电网运行状态记录在区块体中,使区块链之间的链接融入到物理状态传递约束中。交易机制方面,根据能源交易的机制和模式,提出了一种基于智能合约的实时交易机制。分布式电力交易系统的交易仿真验证了该方法的有效性。
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引用次数: 0
A Numerical Study on Rime Ice Accretion Characteristics for Wind Turbine Blades 风力发电机叶片雾凇积冰特性数值研究
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10167305
Fawu Li, Hao Lu, Yongzhong Xu
Ice accumulation on wind turbine blade will change aerodynamic performance of blade, increase additional load and then seriously reduce the power generation. To improve power generation, numerical simulation is applied to predict wind turbine blade icing in this paper. The ice accretion process and aerodynamic characteristics of the blade are combined and predicted by using the Fensap-Ice and ANSYS FLUENT software. The features of ice accumulation on wind turbine blade and the influence of icing with different angles of attack (AoA) and median diameter of water droplets (MVD) on aerodynamic performance are studied. It is concluded that with augment of AoA, the whole ice-covered area moves toward pressure surface, the ice limit point of pressure surface and suction surface moves down. When the MVD is 40 μm, the change rate of aerodynamic performance is the largest. The change rate of lift coefficient and drag coefficient is 9.4 % and 54.74 %, respectively.
风力机叶片上积冰会改变叶片的气动性能,增加附加负荷,进而严重降低发电量。为了提高发电效率,本文采用数值模拟方法对风力机叶片结冰进行预测。利用Fensap-Ice软件和ANSYS FLUENT软件对叶片的吸冰过程和气动特性进行了结合和预测。研究了风力机叶片积冰特性,以及不同迎角和水滴中值直径结冰对叶片气动性能的影响。结果表明:随着AoA的增大,整个冰覆盖面积向压力面移动,压力面和吸力面冰极限点下移;当MVD为40 μm时,气动性能变化率最大。升力系数和阻力系数的变化率分别为9.4%和54.74%。
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引用次数: 0
Research on Design of New 10kV Intelligent Explosion-proof Cable Joint 新型10kV智能防爆电缆接头设计研究
Pub Date : 2023-05-12 DOI: 10.1109/CEEPE58418.2023.10166076
Yanbiao Wang, Yi Mu, Bingwen Wang, Chun Liu
For cable joint with high failure rate, it is necessary to evaluate the health state of cable joint by on-line monitoring of internal characteristic state quantities, which can provide support for cable joint fault warning and fault diagnosis. However, most of the existing cable joint products are not suitable for the online monitoring of running state of cable joint. To address this issue, a new intelligent explosion-proof cable joint product was designed to realize the fault early warning and fault location on the premise of ensuring electrical safety. Moreover, the structural design of new cable joint product guarantees the excellent insulation performance, waterproof performance and explosion-proof performance. The superiorities of new cable joint product compared with tradition cable joint product were verified by the simulation model and real test. The new intelligent explosion-proof cable joint product with high reliability can directly reflect the health status of cable joint, which has important significance for ensuring the safe operation of cable line.
对于故障率较高的电缆接头,有必要通过在线监测内部特征状态量来评估电缆接头的健康状态,为电缆接头故障预警和故障诊断提供支持。然而,现有的电缆接头产品大多不适合对电缆接头的运行状态进行在线监测。针对这一问题,设计了一种新型智能防爆电缆接头产品,在保证电气安全的前提下实现故障预警和故障定位。此外,新型电缆接头产品的结构设计保证了优良的绝缘性能、防水性能和防爆性能。通过仿真模型和实际试验,验证了新型电缆接头产品与传统电缆接头产品相比的优越性。高可靠性的新型智能防爆电缆接头产品能直接反映电缆接头的健康状态,对保证电缆线路的安全运行具有重要意义。
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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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