Abstract
In order to solve the problem of icing on the surface of wind turbine blade, a heating system that includes a carbon fiber net (CFN) and power cables is proposed recently. When lightning strikes at the blade with a de-icing heating system, the blade and its heating system are more easily damaged due to the overvoltage between the lightning protection system (LPS) of the blade and the heating system. In this paper, the models of a wind turbine blade with the de-icing heating system are established by Alternative Transients Program/Electromagnetic Transients Program (ATP–EMTP) and the accuracy of models is verified through an experiment. With these models, the influence of lightning current, surge protective devices (SPDs) and earthing resistance of wind turbine are analyzed by calculating the voltage between the down-conductor of the LPS and the heating system. The results show that the voltage is positively correlated with lightning current amplitude and negatively correlated with the front time of lightning current. SPDs are quite useful to reduce the voltage, and an optimal installation scheme of SPDs is obtained by simulation. It is noted that voltage decreases slightly with the increasing earthing resistance with the optimal installation scheme of SPDs.
Highlights
The wind-power industry is developing rapidly in China
This paper provides a numerical study on the lightning protection of the de-icing blades with
carbon fiber net (CFN) is equivalent segment length is less model than 1/10 of segmented the minimum wavelength corresponding the maximum to the wave impedance and is according to the principle that theto segment length is frequency of the lightning current is equivalent to an equivalent circuit in lightning which a less than 1/10 of the minimum wavelength corresponding to the maximum frequency of the plurality of wave impedance is connected in series
Summary
The wind-power industry is developing rapidly in China. Wind farms in China are mainly distributed in the three north regions and coastal areas with abundant wind resources. The wind turbine blade de-icing is the electric-heating method with carbonby fiber. This method can increase the surface temperature of the blade evenly and achieve. 1 shows the of structure a windblade turbine blade cover withand a CFN, and 2 shows shows the internal down-conductor and the electrical heating system, including the and power-supply cables. LPS,between the self-inductance of the and the electric-heating loop will generate induced surge current in the heating system.during large down-conductor of the LPS will generate high voltage-drop on the down-conductor transient lightning current flowing through it. If discharge does not happen, the mutual inductance between the down-conductor
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