Speaker
Description
High temperature superconducting (HTS) cables are expected to play an important role in modernizing the electric power grid. Significant increase in the fraction of renewable power generation is forcing the society to rethink the structure of electrical power grid in the US and elsewhere. Multi-gigawatt capacity long distance DC power transmission and interconnection of the three US power grids are becoming essential for full integration of renewable energy sources and to manage the variability in generation capacity of the renewable sources. The most suitable sites for renewable power generation are typically located far from major load centers, requiring a substantial increase in transmission grid capacity and efficiency. HTS conductor manufacturing has matured and expanded with multiple suppliers around the world. Similarly, HTS cable manufacturing technology has been demonstrated with several demonstrations and installations in the power grid. Cross-country superconducting cables offer many benefits, but have several technical challenges that need to be addressed before making it a reality. This paper presents a study that addresses a few of the challenges for long distance DC superconducting cables: (i) high voltage dielectric and thermal designs, (ii) efficient power electronics and protection systems for multi-terminal DC cables, and (iii) costs associated with the technology. The paper discusses the technical challenges, currently available commercial solutions, gaps in technology, and potential solutions for the outstanding challenges.