Summary
With China’s increasing integration of variable renewable energy into power grids, conventional hydropower units are progressively assigned critical grid-stabilizing functions— such as peak shaving, frequency regulation, and contingency reserve—due to their broad output adjustment range and rapid response capability. Under frequent load regulation, hydrogenerators experience cyclic variations in internal electromagnetic forces, thermal stresses, and mechanical stresses. The cumulative fatigue effect induces significant deviations in long-term structural reliability compared to units operating under steady base loads. This paper statistically analyzes over twenty years of operational and maintenance data from aircooled and evaporative-cooled hydrogenerators at Lijiaxia Hydropower Station, a facility designated for peak shaving and frequency regulation in the Northwest China Power Grid.
Read more Read lessLong-term data demonstrate that evaporative-cooled stator systems significantly enhance hydrogenerator reliability. Furthermore, evaporative-cooled hydrogenerators require markedly fewer major overhauls than air-cooled counterparts, translating to substantially lower lifecycle maintenance costs.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | A1_12630_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Serbia |
| Study committees | |
| File size | 833 KB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
CHEN Jinxiu - Institute of Electrical Engineering Chinese Academy of Science China; JIA Yonghong - Qinghai Yellow River Upstream Hydropower Development Co Ltd China; RUAN Lin - Institute of Electrical Engineering Chinese Academy of Science China; SUN Chenghao - Qinghai Yellow River Upstream Hydropower Development Co Ltd China; BAO Bingyan - Institute of Electrical Engineering Chinese Academy of Science China; JIANG Wei - Qinghai Yellow River Upstream Hydropower Development Co Ltd China; WEI Tao - Qinghai Yellow River Upstream Hydropower Development Co Ltd China; ZHANG Xinyi - Qinghai Yellow River Upstream Hydropower Development Co Ltd China
Keywords
