Lightning overvoltage protection of 35kV collector lines in wind farms

Guo, Jihong; Liu, Runbiao; Jing, Zhe

doi:10.1109/icpeca56706.2023.10075751

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Analysis Of the Harm And Generation Principle Of Overvoltage...1

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2024

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“…In high-frequency situations, the load impedance at the generator end is much greater than the characteristic impedance of the cable, and the state of the generator end is approximately regarded as an open circuit. When the PWM pulse wave is reflected and transmitted to the generator end, the pulse wave undergoes a total reflection, forming an overvoltage of twice or even more at the generator end, causing insulation damage to the generator and cable explosion [14].…”

Section: Analysis Of the Harm And Generation Principle Of Overvoltage...mentioning

confidence: 99%

Research on Overvoltage at the Wind Turbine Terminal

Lin,

Hao,

Yan

2024

J. Phys.: Conf. Ser.

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This article provides an in-depth analysis of the causes of overvoltage at the generator end and the existing overvoltage protection circuits. Due to the long cable connection between the generator and the converter, voltage reflection occurs during the power transmission process, resulting in overvoltage at the output end of the generator and the input end of the converter. A mathematical model and simulation model have been established to address this issue. Firstly, the transmission line theory is used to analyze the characteristics of PWM pulse transmission in long cables. The reasons for overvoltage at the generator end and the influence of cable distribution parameters on overvoltage are analyzed; Secondly, conduct theoretical calculations; Finally, establish a simulation model using Matlab/Simulink, and analyze the harm of motor terminal overvoltage to the wind power generation system through simulation.

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Section: Analysis Of the Harm And Generation Principle Of Overvoltage...mentioning

confidence: 99%