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[Introduction]Since 2017, offshore wind power in Guangdong province has entered a period of rapid development. As the development of shallow water windfarms tends to be saturated, the construction of large-scale offshore windfarms in deep water areas is about to start. The array submarine cable is an important link in the whole design process of offshore wind power. The array cable connecting the WTG with the offshore substation can effectively reduce the power loss, the initial investment of the project and improve the reliability of operation through reasonable design. In view of the transformation from conventional offshore windfarm to large-scale offshore windfarm, the design of Array submarine cable also needs to be adjusted simultaneously. [Method] Based on this, this paper discussed the possibility of using 66 kV submarine cable in large offshore windfarms with technological and economic analysis. [Result] After comparative analysis, when the WTG capacity reaches 10 MW or more and the wind farm's overall installed capacity reaches 1 000 MW, the technical and economic effects of 66 kV array system is obviously better than that of the current 35 kV system. [Conclusion] Although there is no real 66 kV submarine cable case in the current domestic offshore windfarm, with the increasing of offshore windfarm capacity, China's offshore wind array system is bound to move like the UK, Germany, toward a higher voltage class direction.

This work aimed to study the effects of different surface treatments on the morphologies and thermomechanical properties of the bamboo flour/polypropylene (BF/PP) composites, which were prepared by melt blending with 15 wt% of filler load. The BF was first pretreated with 10 wt% sodium hydroxide (NaOH) solutions for 4 h, after which the pre-treated BF was modified by stearic acid and silane. The chemical structure of the treated BF fibers was characterized through Fourier transform infrared spectroscopy (FTIR), and the results showed that alkali treatment efficiently removed hemicellulose, lignin, and pectin. Moreover, stearic acid and silane were successfully introduced to the BF surface through chemical bonding. The changes in heat stability of BF investigated by thermogravimetric analysis (TGA) revealed that the presence of treatment contributes to a better thermal stability for BF fibers. In addition, the scanning electron microscopy (SEM) observation of BF/PP composites displayed not only better dispersion of treated-BF in the polypropylene (PP) matrix, but also improved fiber-matrix interfacial compatibility, especially when silane treatment was used. Accordingly, the mechanical properties improved significantly in the presence of treated-BF. [ABSTRACT FROM AUTHOR]