Numerical calculation of the lightning transient voltage distribution on converter transformer winding based a dual winding model

Autor: Hongrui Jia, Xuezhong Liu, Shijin Tian, Lin Wang, Fei Gao
Jazyk: angličtina
Rok vydání: 2019
Předmět:
equivalent circuits
HVDC power convertors
rectifiers
power grids
voltage distribution
power transformers
transformer windings
lightning protection
typical converter station
dual winding model
transient voltage characteristics
maximum lightning transient voltage
star-connected winding
winding double-disc unit
converter valve
transient voltages
three-phase winding
star-connected phase winding
winding disc
lightning transient voltage distribution
converter transformer winding
LC equivalent network circuit
ideal transformer
12-pulse rectifier equivalent circuit model
single-phase converter transformer
12 converter valves
converter value
PSCAD software
lightning current
voltage 500.0 kV
voltage 1270.0 kV
voltage 174.0 kV
current 20.0 kA
Engineering (General). Civil engineering (General)
TA1-2040
Zdroj: The Journal of Engineering (2019)
Druh dokumentu: article
ISSN: 2051-3305
DOI: 10.1049/joe.2018.8458
Popis: The insulation co-ordination of converter transformer winding has a great influence on power system security. An equivalent circuit of a 500 kV converter transformer winding structure, including a LC equivalent network circuit and an ideal transformer in parallel, was firstly established. A combined 12-pulse rectifier equivalent circuit model, mainly consisting of six single-phase converter transformer and 12 converter valves, was built in Power Systems Computer Aided Design (PSCAD) software. In certain operating states of the converter value, the transient voltage distribution was analysed when lightning strokes the DC bus of a typical converter station. The results show that the dual winding model can present the transient voltage characteristics of the converter transformer. The maximum lightning transient voltage is located at the end of the star-connected winding near the neutral point and reaches 1270 kV, and also the maximum gradient voltage occurs at the winding near the terminal point. In different operating states for the converter valve, the transient voltages of a three-phase winding behave as per the similar distributing rules. For the star-connected phase winding, the lightning transient voltage of the winding disc reaches the maximum magnitude when lightning strike occurs at the peak of the phase voltage on the valve side.
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