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A Fault Current Limiting Hybrid dc circuit breaker

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Energy Engineering 2022年第2期119卷 621-636页

作者： Lei Huang Qian Zhang Wenlei Liu Ruixue Liu Mechanical and Control Engineering College Shengli College China University of PetroleumDongying257061China

Due to the low impedance characteristic of the high voltage direct current(HVdc)grid,the fault current rises extremely fast after a dc-side fault occurs,and this phenomenon seriously endangers the safety of the HVdc *** order to suppress the rising speed of the fault current and reduce the current interruption requirements of the main breaker(MB),a fault current limiting hybrid dc circuit breaker(FCL-HCB)has been proposed in this paper,and it has the capability of bidirectional fault current limiting and fault current *** the occurrence of the overcurrent in the HVdc grid,the current limiting circuit(CLC)of FCL-HCB is put into operation immediately,and whether the protected line is cut off or resumed to normal operation is decided according to the fault detection *** with the traditional hybrid dc circuit breaker(HCB),the required number of semiconductor switches and the peak value of fault current after fault occurs are greatly reduced by adopting the proposed *** simulations also verify the effectiveness of the proposed FCL-HCB.

关键词： Fault current limiting hybrid dc circuit breaker(FCL-HCB) high voltage direct current(HVdc)grid fault current limiting fault current interruption dc circuit breaker

Novel Fast Operating Moving Coil Actuator with Compensation Coil for HVdc circuit breakers

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CSEE Journal of Power and Energy Systems 2021年第5期7卷 1041-1050页

作者： Boyuan Yin Xianwu Zeng John F.Eastham Damian Vilchis-Rodriguez Xiaoze Pei Department of Electronic&Electrical Engineering.University of Bath.Bath.United Kingdom Department of Mechanical Engineering University of Bath.Bath.United Kingdom. Power and Energy Division School of Electrical and Electronic EngineeringThe University of ManchesterManchester M139PLUnited Kingdom.

dc circuit breakers are major enabling components for multi-terminal HVdc *** key design targets are operating speed and *** paper proposes a novel moving coil actuator using a compensation coil topology to operate mechanical circuit *** topology aims to significantly improve the magnetic field saturation and reduce the system inductance,so that the operating speed is *** possible connection methods for the compensation coils are proposed and analyzed using finite element modeling,ensuing simulation results are compared and *** operating speed of the moving coil actuator with compensation coils is significantly improved compared with the original moving coil *** moving coil actuator with compensation coils can open a distance of 5 mm within 2.8 ms and the peak efficiency is 47%.

关键词： Compensation coil dc circuit breaker HVdc mechanical circuit breaker moving coil actuator

Magneto-hydrodynamic simulation study of direct current multi-contact circuit breaker for equalizing breaking arc

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Plasma Science and Technology 2023年第2期25卷 207-215页

作者：贾博文武建文李枢吴昊彭向军戴健陈儒盎 Systems Engineering Institute Academy of Military SciencesBeijing 100071People's Republic of China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100083People's Republic of China

This work is based on a direct current(dc)natural current commutation topology,which uses load-carrying branch contacts carrying rated current and multiple sets of series arcing branch contacts in parallel to achieve circuit *** proposed topology can meet the new requirements of higher voltage dc switches in aviation,aerospace,energy and other ***,a magneto-hydrodynamic arc model is built using COMSOL Multiphysics,and the different arc breaking characteristics of the arcing branch contacts in different gas environments are ***,a voltage uniformity coefficient is used to measure the voltage sharing effect in the process of dynamic *** order to solve the dispersion of arcing contact action,a structural control method is adopted to improve the voltage uniformity *** uniform voltage distribution can improve the breaking capacity and electrical life of the series connection structure.

关键词： dc circuit breaker voltage uniformity coefficient MHD modelling uniform-voltage regulation method

Coordination Method for dc Fault Current Suppression and Clearance in dc Grids

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CSEE Journal of Power and Energy Systems 2022年第5期8卷 1438-1447页

作者： Xibei Zhao Lixu Chen Gen Li Jianzhong Xu Jinsha Yuan State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China School of Engineering Cardiff UniversityCardiffUK

The modular multilevel converter(MMC)based dc grid is considered as a future solution for bulk renewable energy integration and ***,the high probability of dc faults and their rapid propagation speed are the main challenges in the development of dc *** research primarily focuses on the dc fault clearance methods,while the fault current suppression methods are still barely ***,the coordination method of fault current suppression and clearance needs to be *** this paper,the technical characteristics of the current suppression methods are studied,and the coordinated methods of fault current suppression and clearance are *** last,a cost comparison of these methods is *** research results show that the proposed strategies can reduce the cost of the protection equipment.

关键词： dc circuit breaker dc fault dc grid fault current limiter(FCL)

Numerical Study on Arc Plasma Behavior During Arc Commutation Process in Direct Current circuit breaker

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Plasma Science and Technology 2012年第2期14卷 167-171页

作者：杨飞马瑞光吴翊孙昊纽春萍荣命哲 State Key Lab of Electrical Insulation and Power Equipment School of Electrical EngineeringXi'an Jiaotong University

This paper focuses on the numerical investigation of arc plasma behavior during arc commutation process in a medium-voltage direct current circuit breaker （dcCB） contact system. A three-dimensional magneto-hydrodynamic （MHD） model of air arc plasma in the contact system of a dcCB is developed, based on commercial software FLUENT. Coupled electromagnetic and gas dynamic interactions are considered as usual, and a thin layer of nonlinear electrical resistance elements is used to represent the voltage drop of plasma sheath and the formation of new arc root. The distributions of pressure, temperature, gas flow and current density of arc plasma in arc region are calculated. The simulation results indicate that the pressure distribution related to the contact system has a strong effect on the arc commutation process, arising from the change of electrical conductivity in the arc root region. In dcCB contact system, the pressure of arc root region will be concentrated and higher if the space above the moving contact is enclosed, which is not good for arc root commutation. However, when the region is opened, the pressure distribution would be lower and more evenly, which is favorable for the arc root commutation.

关键词： arc plasma dc circuit breaker arc commutation pressure simulation

Protection of large partitioned MTdc Networks Using dc-dc converters and circuit breakers

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Protection and Control of Modern Power Systems 2016年第1期1卷 170-178页

作者： Md Habibur Rahman Lie Xu Liangzhong Yao University of Strathclyde GlasgowUK China Electric Power Research Institute BeijingChina.

This paper proposes a dc fault protection strategy for large multi-terminal HVdc(MTdc)network where MMC based dc-dc converter is configured at strategic locations to allow the large MTdc network to be operated interconnected but partitioned into islanded dc network zones following *** dc network zone is protected using either AC circuit breakers coordinated with dc switches or slow mechanical type dc circuit breakers to minimize the capital *** case of a dc fault event,dc-dc converters which have inherent dc fault isolation capability provide‘firewall’between the faulty and healthy zones such that the faulty dc network zone can be quickly isolated from the remaining of the MTdc network to allow the healthy dc network zones to remain *** validity of the proposed protection arrangement is confirmed using MATLAB/SIMULINK simulations.

关键词： dc circuit breaker dc-dc converter dc fault HVdc Modular multilevel converter(MMC) Network