scholarly journals Modeling and Analysis of Short-Circuit Fault Current for MMC-HVDC Grid with DC Circuit Breaker

2020 ◽  
Vol 508 ◽  
pp. 012039
Author(s):  
Haipeng Jia ◽  
Jingyuan Yin ◽  
Tongzhen Wei ◽  
Jinke Li ◽  
Lixin Wu
Keyword(s):  
Short Circuit ◽  
Circuit Breaker ◽  
Fault Current ◽  
Modeling And Analysis ◽  
Dc Circuit Breaker ◽  
Short Circuit Fault

scholarly journals Short-Circuit Fault Current Calculation Method for the Multi-Terminal DC Grid Considering the DC Circuit Breaker

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1347
Author(s):  
Haipeng Jia ◽  
Jingyuan Yin ◽  
Tongzhen Wei ◽  
Qunhai Huo ◽  
Jinke Li ◽  
...  
Keyword(s):  
Calculation Method ◽  
Short Circuit ◽  
Circuit Breaker ◽  
Fault Current ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Dc System ◽  
Short Circuit Calculation ◽  
Dc Circuit Breaker ◽  
Short Circuit Fault

The analysis and calculation of the short-circuit fault current in the DC grid is of great significance to the design and configuration of the converter station and DC circuit breaker parameters. The existing flexible DC system not only includes the modular multilevel converter (MMC) converter, but also needs power equipment such as the fault current limiter and DC circuit breaker. Therefore, the system modeling and short circuit calculation of the multi-terminal DC system after adding the DC circuit breaker are also of great significance for the design of DC power system parameters and the grid troubleshooting ability. In this paper, firstly, the parameters of the four-terminal DC system of the modular multilevel converter (MMC) are simplified, and the analytical solution of the short circuit fault current of the multi-terminal DC system is given. Then, the external characteristics of the cascaded hybrid DC circuit breaker are modeled. Based on the equivalent circuit of the fault current in different stages, the short circuit calculation method of four-terminal MMC system with DC circuit breaker is obtained. This method can effectively describe the overall trend of fault current and provide the basis for the configuration of DC line protection settings and DC circuit breaker related parameters.

Fault Current Detection Based on Neural Network in Hybrid Circuit Breaker

2011 ◽  
Vol 204-210 ◽  
pp. 887-890 ◽  
Author(s):  
Yang Zhao ◽  
Yue Feng ◽  
Qi Yong Wen
Keyword(s):  
Neural Network ◽  
Short Circuit ◽  
Circuit Breaker ◽  
Detection Methods ◽  
Fault Current ◽  
Detection Circuit ◽  
Simulation Results ◽  
Short Circuit Fault ◽  
Current Detection ◽  
Hybrid Circuit

Power system short circuit and fault current detection circuit breaker is a hybrid produced the basis for action, rapid detection methods and effectiveness of a direct impact on the circuit breaker switch performance. In this paper neural network short-circuit fault current detection, the simulation results show that the method is effective and fast.

scholarly journals Capacitor Commutation Method for MVDC Hybrid Circuit Breakers

Designs ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 28
Author(s):  
Hyosung Kim
Keyword(s):  
Short Circuit ◽  
Circuit Breaker ◽  
Reverse Current ◽  
Resonant Circuit ◽  
Power Circuit ◽  
Power Sources ◽  
Semiconductor Switch ◽  
Current Commutation ◽  
Dc Circuit Breaker ◽  
Hybrid Circuit

The medium voltage DC (MVDC) type system can connect multiple terminals to a common MVDC bus, so it is possible to connect several renewable DC power sources to the common MVDC bus, but a DC circuit breaker is needed to isolate short circuit accidents that may occur in the MVDC bus. For this purpose, the concept of a hybrid DC circuit breaker that takes advantage of a low conduction loss contact type switch and an arcless-breaking semiconductor switch has been proposed. During break the hybrid switch, a dedicated current commutation device is required to temporarily bypass the load current flowing through the main switch into a semiconductor switch branch. Existing current commutation methods include a proactive method and a reverse current injection method by a LC (Inductor-capacitor) resonant circuit. This paper proposes a power circuit of a new MVDC hybrid circuit breaker using a low withstanding voltage capacitor branch for commutation and a sequence controller according to it, and verifies its operation through an experiment.

A modular hybrid DC circuit breaker with fault current self-adaptive control and protection coordination

2022 ◽  
Vol 134 ◽  
pp. 107434
Author(s):  
Shimin Xue ◽  
Baibing Liu ◽  
Shouxiang Wang ◽  
Xiao Chen ◽  
Xiaoshuai Zhu ◽  
...  
Keyword(s):  
Adaptive Control ◽  
Circuit Breaker ◽  
Fault Current ◽  
Dc Circuit Breaker ◽  
Self Adaptive

Design and Simulation of Breaking Time Sequence for DC Circuit Breaker with a Current-Limiting Inductance

2014 ◽  
Vol 556-562 ◽  
pp. 1959-1963
Author(s):  
Si Ming Wei ◽  
Yi Gong Zhang ◽  
Huan Liu ◽  
Zhi Qiang Dai ◽  
Xiao Du
Keyword(s):  
Design Method ◽  
Circuit Breaker ◽  
Time Sequence ◽  
Fault Current ◽  
Distribution Grid ◽  
Current Limiting ◽  
Selection Principles ◽  
Dc Circuit Breaker ◽  
Breaking Time ◽  
A Current

It is great significance for development of MTDC (Multi-terminal HVDC) to build DC transmission and distribution grids. However, the relatively low impedance in DC grids makes the fault penetration much faster and deeper .Consequently, fast and reliable DC circuit breaker is needed to isolate faults. Breaking time and other parameters are important for a breaker to achieve its goals. This paper presents a DC circuit breaker with a current-limiting inductance and gets the rising and falling characteristics of fault current. Based on the characteristics, a design method of breaking time sequence will be given, as well as the calculation of current-limiting inductance and the selection principles of arresters. A 10kV DC distribution grid is modeled and simulated by PSCAD/EMTDC to verify that the method can meet the requirements of breaking fault current quickly and reliably.

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