VS 2 @MXene (or pure VS 2 ): superconducting carbon black: PTFE = 8:1:1 as the cathode, zinc foil (ø = 16 mm, thickness of 2 µm) as the anode, 1 m ZnSO 4 or 1 m ZnSO 4 +SPANI as the aqueous electrolyte. The active materials loading on the cathode electrode was around 1.2 mg cm −2 . The electrochemical tests of CV and EIS were carried out at the CHI 660 electrochemical workstation, rate capability, cycling performance, and GITT tests were carried out at the CT2001 machine.

To integrate large-scale islanded onshore wind power with different sizes, this paper proposes an integration system based on the cascaded hybrid HVDC transmission system, which consists of LCC and several MMCs in series connection at the DC side of the rectifier. A large-scale wind farm is connected with one LCC and one MMC while several small-scale wind farms are connected with MMCs directly. Owing to the hierarchical integration arrangement, the operating flexibility can be improved with reduced capacity and the number of step-up interfacing transformers. A resilient DC voltage control is proposed for the integration system to adaptively redistribute power among the converters during wind power fluctuations. Firstly, the topology and operating characteristics of the wind power integration system are introduced. Then, a resilient DC voltage control is proposed to ensure stable operation during wind power curtailments. Finally, a simulation model of the hybrid cascaded HVDC transmission system is built in PSCAD/EMTDC to verify the effectiveness. The research results show that the system provides a new option for long-distance transmission of large-scale islanded wind power.

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