Fault section locating method and recovery strategy of pole-to-ground fault for medium voltage direct current (MVDC) distribution network

Autor: Shiming Liu, Chenjun Sun, Shan He, Guibin Zou
Jazyk: angličtina
Rok vydání: 2019
Předmět:
earthing
fault currents
MMC-based DC distribution network
Computer science
DC distribution system
common grounding mode
Energy Engineering and Power Technology
power distribution protection
Hardware_PERFORMANCEANDRELIABILITY
Fault (power engineering)
steady-state fault
law.invention
fault criterion
changing rate
law
Control theory
fault location
pole-to-ground fault recovery strategy
DC feeder current travelling wave
Ground
MVDC distribution network
Direct current
General Engineering
Wavelet transform
power transmission faults
DC pole-to-ground voltage amplitude
Current limiting
wavelet transforms
distribution networks
high-resistance clamping grounding
lcsh:TA1-2040
resistors
power distribution faults
Resistor
rapid fault section locating method
lcsh:Engineering (General). Civil engineering (General)
Software
grounding resistor
Voltage
Zdroj: The Journal of Engineering (2019)
DOI: 10.1049/joe.2018.8378
Popis: High-resistance clamping grounding is a common grounding mode of modular multilevel converter (MMC) based DC distribution network. Due to the current limiting function of grounding resistor, pole-to-ground fault can only cause limited steady-state fault current. Consequently, it is very difficult to locate fault section. Besides, there are a few research works on pole-to-ground fault recovery strategy of a DC distribution system. This study purposes a fault criterion based on DC pole-to-ground voltage amplitude and changing rate. Then, by extracting polarities of a DC feeder current travelling wave using the method of wavelet transform modulus maximum, a rapid fault section locating method is presented. Furthermore, a feasible pole-to-ground fault recovery strategy is introduced, which can reduce outage range and time on the premise of guaranteeing system stability. The performances of the proposed methodologies were validated by numerical simulation.
Databáze: OpenAIRE
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