Summary
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:
Read more Read less As previously mentioned, the AC networks are continuously getting weaker LCC multi-infeed interactions can threaten stability of the entire AC network To ensure stable renewable energy DC transmission on a multi-gigawatt scale, there is need to scale up VSC to be on par with existing LCC UHVDC technology. This paper discusses the first 8 GW VSC UHVDC transmission with key focus on fault handing. The key reasons why fault handling becomes challenging, is mostly the long DC line and high nominal DC current.
Three such faults are: External DC fault, internal converter bus fault and External AC fault.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | B4_11600_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | China, People's Republic of |
| Study committees | |
| File size | 2 MB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
ANDERSSON Mats - Hitachi energy; WANG Guoying - Hitachi energy; LU Jingwei - Hitachi energy
Keywords
VSC UHVDC, Renewable integration, Fault handling, Fault ride through, EMT simulation
