1. Advantage analysis of variable-speed pumped storage units in renewable energy power grid: Mechanism of avoiding S-shaped region. (September 2020) Authors: Feng, Chen; Li, Chaoshun; Chang, Li; Ding, Tan; Mai, Zijun Journal: International journal of electrical power & energy systems Issue: Volume 120(2020) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗