8 GW VSC UHVDC transmission -- Fault handling in the Gansu-Zhejiang ±800 kV project

China is fully committed to its carbon dioxide reduction goals: Carbon peak by 2030; Carbon neutrality by 2060 [1]. Renewable energy integration is naturally a key enabler, by August 2025, the wind and solar PV installed capacity in China was 1690 GW, a number that was tripled since 2020 [2]. AC networks get weaker with less coal power and more renewables in the power system. In addition, a lot of large-scale wind and/or solar resources are located thousands of kilometers away from the main load centers on the east coast. Traditionally, point-to-point LCC UHVDC transmission at ±800 kV or higher voltage have been used for such long distances [3]. But there are two key issues to consider: