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基于混合铁心的新型电流互感器研究

电子测量与仪器学报 2024年第1期38卷 9-24页

作者：张哲璇陈柏超田翠华陈耀军王羽武汉大学电气与自动化学院武汉430072 武汉大学电网环境保护全国重点实验室武汉430072

传统电流互感器铁心饱和会导致其二次电流波形发生畸变,进而可能影响电能计量的精度或引起继电保护设备错误动作,威胁电网的安全稳定运行。针对此类问题,提出了基于混合铁心的新型电流互感器(CCCT)。CCCT主要由混合铁心、二次绕组、二... 详细信息

传统电流互感器铁心饱和会导致其二次电流波形发生畸变,进而可能影响电能计量的精度或引起继电保护设备错误动作,威胁电网的安全稳定运行。针对此类问题,提出了基于混合铁心的新型电流互感器(CCCT)。CCCT主要由混合铁心、二次绕组、二次电阻、磁场传感器与信号处理电路组成,其中混合铁心包含完整的内铁心与带气隙的外铁心,磁场传感器放置在外铁心的气隙中,其输出信号用于补偿发生畸变的二次电流。为验证该结构的有效性,进行了有限元仿真,制作了CCCT样机并进行了正弦交流电流、正弦半波电流、短路电流和直流电流的测量实验。有限元仿真与实验结果表明,CCCT在额定电流下的复合误差小于0.2%,稳态对称短路电流下的复合误差为2.04%,暂态短路电流下的峰值瞬时误差为4.25%,直流条件下输出与输入的拟合优度为0.999 9,既基本保留了传统电流互感器的测量精度,也具有良好的暂态响应特性与抗直流特性,可同时满足相关标准对测量、保护用电流互感器的精度要求,具备在实际工程中应用的潜力。

关键词：电流互感器铁心饱和电能计量继电保护混合铁心磁场传感器

Parallel diode-clamped linear converter for withstand test and partial discharge measurement of electric equipment

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High Voltage 2023年第1期8卷 171-182页

作者： Yuxiong Zhou baichao chen Cuihua Tian Jiaxin Yuan Yaojun chen School of Electrical Engineering and Automation Wuhan UniversityWuhanChina

High-voltage withstand tests are essential for electric equipment like power transformers,electric cable lines,gas insulated switchgears *** partial discharge(PD)measurement for such equipment under applied high voltage is also required at the same *** Width Modulation(PWM)-based variable frequency power supply(VFPS)finds wide applications in the series resonance high-voltage testing ***,the steep rising and falling voltage edges in the PWM process will produce large amount of partial discharge interference in a wide spectrum range,which will confuse the real partial discharge signal of the device and lead to the wrong estimation of the insulation *** paper proposes a new VFPS based on the highefficiency linear power amplifier without PD *** topology and principle of the VFPS are given and discussed.A prototype rated at 232 V/35 A was designed and constructed to verify the feasibility of the proposed *** experiments were carried out on the prototype.

关键词： amplifier linear insulation

Pareto optimal allocation of fault current limiter based on immune algorithm considering cost and mitigation effect

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Journal of Modern Power Systems and Clean Energy 2017年第5期5卷 820-829页

作者： baichao chen Liangliang WEI Yuanzhe ZHU Yongheng ZHONG Jiaxin YUAN Yang LEI School of Electrical Engineering Wuhan UniversityWuhan 430072China

This paper presents a multi-objective Pareto optimal method for allocation of fault current limiters based on an immune algorithm, which takes into account two objectives of the cost and fault current mitigation effect. A sensitivity factor calculation method based on the rate of fault current mitigation is proposed to reduce the search space and improve the efficiency of the *** this approach, the objective functions related to the cost and fault current mitigation effect are established. A modified inversion operator based on equal cost is proposed to converge to global optimal solutions more effectively. The proposed algorithm is tested on the IEEE39-bus system, and obtains the Pareto optimal solutions,from which the user can select the most suitable solutions according to the preferences and relative importance of the objective functions. Simulation results are used to verify the proposed method.

关键词： FCL optimal allocation Fault current mitigation effect Modified inversion operator Pareto optimal solutions Immune algorithm

Coupled autotransformer and magneticcontrol soft-start method for super-largecapacity high-voltage motors

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High Voltage 2020年第1期5卷 38-45页

作者： Jiaxin Yuan Chuansheng Wang Shan Yin Liangliang Wei Kazuhiro Muramatsu baichao chen School of Electrical Engineering and Automation Wuhan UniversityWuhanPeople's Republic of China Shenzhen Institute of Wuhan University ShenzhenPeople's Republic of China China Energy Engineering Group Jiangsu Power Design Institute Company NanjingPeople's Republic of China Department of Electrical Engineering Kyoto UniversityKyotoJapan Department of Electrical and Electronic Engineering Saga UniversitySagaJapan

The large current generated by a direct start of the super-large-capacity high-voltage induction motor would have a huge impact on the power grid as well as the motor *** soft starters have the shortcomings of discontinuous adjustment,voltage sags,sudden torque mutation,secondary current impact and high *** resolve this issue,the authors propose a novel coupled autotransformer and magnetic-control(CATMC)soft-start *** structure of the new CATMC soft starter combines the functions of the autotransformer and magnetic control reactor via an innovative electric and magnetic circuit *** this study,the authors analyse the magnetic circuit structure and working principles of the CATMC soft ***,to validate its principle and performance,the authors conduct a simulation study using ANSYS software and design and test an 18 MW/10 kV CATMC soft starter *** simulation results demonstrate that the CATMC soft starter effectively avoids secondary current impact and constrains the motor starting current to<2.5 times the rated *** public connection point bus voltage also meets the voltage sag requirement of the IEEE standard and reduces the impact on the power grid.

关键词： shortcomings starting combine

Mechanical Analysis and Performance Optimization for the Lunar Rover’s Vane-Telescopic Walking Wheel

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Engineering 2020年第8期6卷 936-943页

作者： Lu Yang Bowen Cai Ronghui Zhang Kening Li Zixian Zhang Jiehao Lei baichao chen Rongben Wang Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin 300384China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of TechnologyTianjin 300384China Guangdong Key Laboratory of Intelligent Transportation System School of Intelligent Systems EngineeringSun Yat-sen UniversityGuangzhou 510275China College of Transportation Jilin UniversityChangchun 130025China Department of Mechanical Science and Engineering Tokyo Institute of TechnologyTokyo 152-8550Japan Armour College of Engineering Illinois Institute of TechnologyChicagoIL 60616USA China Academy of Space Technology Beijing 100029China

It is well-known that optimizing the wheel system of lunar rovers is ***,this is a difficult task due to the complex terrain of the moon and limited resources onboard lunar *** this study,an experimental prototype was set up to analyze the existing mechanical design of a lunar rover and improve its ***,a new vane-telescopic walking wheel was proposed for the lunar rover with a positive and negative quadrangle suspension,considering the complex terrain of the ***,the performance was optimized under the limitations of preserving the slope passage and minimizing power *** was achieved via analysis of the wheel force during ***,the effectiveness of the proposed method was demonstrated by several simulation *** newly designed wheel can protrude on demand and reduce energy consumption;it can be used as a reference for lunar rover development engineering in China.

关键词： Intelligent vehicle Vane-telescopic walking wheel Performance optimization Vane spring Lunar rover

A Novel Soft Start Method of Super Large Capacity High Voltage Motor

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CES Transactions on Electrical Machines and Systems 2019年第3期3卷 302-308页

作者： Jiaxin Yuan Chuansheng Wang Yong Zhu baichao chen Wuhan University Wuhan 430072China

The large current generated by starting directly of super large capacity and high voltage induction motor would have a huge impact on the grid as well as the motor *** variation of the power factor and electromagnetic torque during direct start of motors with different capacity and voltage levels are *** at the problem that the secondary impact of auto-transformer starter is too large and the cost of magnetic control starter is too high,the auto-transformer and magnetic control soft start method of super large capacity and high voltage motor is proposed and the basic working principle is *** calculation formula of cost for magnetic control soft starter and auto-transformer and magnetic control soft starter is deduced,and specific examples are analyzed and *** is concluded that the choice of auto-transformer with appropriate tapping ratio can greatly reduce the cost of auto-transformer and magnetic control soft starter compared with the other ***,the simulation and experiment results show that the start method can effectively avoid secondary current impact and constrain the motor starting current to less than 2.5 times the rated current.

关键词： Auto-transformer buck magnetic controllable reactor super large capacity high voltage induction motor soft start.

Optimal electromagnetic hybrid negative current compensation method for high-speed railway power supply system

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Journal of Modern Power Systems and Clean Energy 2016年第1期4卷 123-134页

作者： Jiaxin YUAN Yongheng ZHONG chenmeng ZHANG Wenjun ZENG baichao chen Cuihua TIAN Changhong DENG Min ZHOU Kazuhiro MURAMATSU Jin WANG School of Electrical Engineering Wuhan UniversityWuhanHubeiChina School of Resource and Environment Science Wuhan UniversityWuhanHubeiChina Department of Advanced Technology Fusion Saga UniversitySagaJapan Electrical and Computer Engineering Ohio State UniversityColumbusOHUSA

To achieve economical compensation for the huge-capacity negative sequence currents generated by high-speed railway load, an electromagnetic hybrid compensation system(EHCS) and control strategy is *** EHCS is made up of a small-capacity railway static power conditioner(RPC) and a large-capacity magnetic static var compensator(MSVC). Compared with traditional compensation methods, the EHCS makes full use of the SVC’s advantages of economy and reliability and of RPC’s advantages of technical capability and flexibility. Based on the idea of injecting a negative sequence, the compensation principle of the EHCS is analyzed in detail. Then the minimum installation capacity of an EHCS is theoretically deduced. Furthermore, a constraint optimization compensation strategy that meets national standards, which reduces compensation capacity further, is proposed. An experimental platform based on a digital signal processor(DSP) and a programmable logic controller(PLC) is built to verify the analysis. Simulated and experimental results are given to demonstrate the effectiveness and feasibility of the proposed method.

关键词： Unbalanced load Electromagnetic hybrid compensation Railway static power conditioner(RPC) Magnetic static var compensator(MSVC) Capacity optimize

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磁控电抗器在750kV系统中的应用

电工技术学报 2005年第1期20卷 31-37页

作者：田翠华陈柏超武汉大学电气工程学院武汉430072

对磁控电抗器的原理、特性进行了分析,提出了超高压磁控电抗器的单元接线方式。对西北750kV系统应用磁控电抗器的调压和操作过电压限制进行了数值分析和计算。

关键词：超高压磁控电抗器电压调节操作过电压

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低谐波双级饱和磁控电抗器研究

电工技术学报 2006年第1期21卷 19-23页

作者：田翠华陈柏超武汉大学电气工程学院武汉430072

为了降低单相磁控电抗器(MCR)产生的高次谐波,提出将磁控电抗器工作铁心设计为双级磁饱和结构,并建立了这种铁心结构的磁路数学模型,在分析单级磁控电抗器谐波分布特性的基础上,给出了双级磁饱和电抗器的谐波抵消原理。对所提出的双级... 详细信息

为了降低单相磁控电抗器(MCR)产生的高次谐波,提出将磁控电抗器工作铁心设计为双级磁饱和结构,并建立了这种铁心结构的磁路数学模型,在分析单级磁控电抗器谐波分布特性的基础上,给出了双级磁饱和电抗器的谐波抵消原理。对所提出的双级饱和磁控电抗器进行了数值仿真和实验研究,结果表明,采用双级饱和铁心结构能将现有单级极限饱和结构的最大谐波含量由7%降低到2.8%。

关键词：磁控电抗器磁饱和谐波抑制