A DC fault identification scheme for multi-terminal VSC-LVDC system based on voltage of current-limiting reactor

This paper concerns with a fault identification scheme in a class of nonlinear interconnected systems. The decentralized sliding mode observer is recruited for the investigation of position sensor fault or velocity sensor fault. First, a decentralized neural network controller is proposed for the system under fault-free state. The diffeomorphism theory is utilized to construct a nonlinear transformation for subsystem structure. A simple filter is implemented to convert the sensor fault into pseudo-actuator fault scenario. The decentralized sliding mode observer is then presented for multisensor fault identification of reconfigurable manipulators based on Lyapunov stable theory. Finally, two 2-DOF reconfigurable manipulators with different configurations are employed to verify the effectiveness of the proposed scheme in numerical simulation. The results demonstrate that one joint’s fault does not affect other joints and the sensor fault can be identified precisely by the proposed decentralized sliding mode observer.

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Fault identification scheme for UPFC compensated transmission line based on characteristic voltage active injection

International Journal of Electrical Power & Energy Systems ◽

10.1016/j.ijepes.2021.107851 ◽

2022 ◽

Vol 137 ◽

pp. 107851

Author(s):

Tao Zheng ◽

Yunpeng Wang ◽

Wenxuan Lv ◽

Zuowei Wang ◽

Yongxin Chen ◽

...

Keyword(s):

Transmission Line ◽

Fault Identification ◽

Identification Scheme

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LCL and L-VSC Converters With DC Fault Current-Limiting Property and Minimal Power Losses

IEEE Transactions on Power Delivery ◽

10.1109/tpwrd.2014.2314481 ◽

2014 ◽

Vol 29 (5) ◽

pp. 2359-2368 ◽

Cited By ~ 11

Author(s):

Weixing Lin ◽

Dragan Jovcic

Keyword(s):

Fault Current ◽

Power Losses ◽

Dc Fault ◽

Current Limiting ◽

Limiting Property

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Sensitive/stable complementary fault identification scheme for overhead transmission lines

IET Generation Transmission & Distribution ◽

10.1049/iet-gtd.2018.5016 ◽

2019 ◽

Vol 13 (15) ◽

pp. 3252-3263 ◽

Cited By ~ 4

Author(s):

Mohamed I. Zaki ◽

Ragab A. El Sehiemy ◽

Ghada M. Amer ◽

Fathy M. Abo El Enin

Keyword(s):

Transmission Lines ◽

Fault Identification ◽

Identification Scheme ◽

Overhead Transmission Lines

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Analysis of the DC Fault Current Limiting Characteristics of a DC Superconducting Fault Current Limiter Using a Transformer

Energies ◽

10.3390/en13164210 ◽

2020 ◽

Vol 13 (16) ◽

pp. 4210

Author(s):

Kang-Cheol Cho ◽

Min-Ki Park ◽

Sung-Hun Lim

Keyword(s):

Circuit Breaker ◽

Fault Current ◽

Fault Current Limiter ◽

Long Distance ◽

Superconducting Fault Current Limiter ◽

Dc System ◽

Dc Fault ◽

Current Limiting ◽

New Type ◽

Current Limiter

Recently, a lot of interesting research has been conducted to solve the fault current problem of the DC system. In long-distance transmission, DC transmission is more economical than AC transmission. The connection of power grids with a DC system can also better control the power flow and provide high stability. However, the control of the fault current in a DC system is more difficult to handle than in an AC system because the DC system does not make a zero point, unlike the AC system. In addition, there is a disadvantage, in that an arc occurs when a circuit breaker operates. In this paper, a new type of DC superconducting fault current limiter (SFCL) is proposed. This new type of SFCL is composed of two superconducting elements, a current limiting resistor/reactor (CLR), and a transformer. With the proposed SFCL, the DC fault current limiting experiments were performed and the DC fault current limiting characteristics of this SFCL due to the component of the CLR were analyzed.

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