Progress and Future Challenges in Stability Research of Hydroelectric Units
Driven by the"dual carbon"goal,wind and photovoltaic power generation will develop into the domi-nant power sources in the power grid.But the scenery is intermittent,volatile and uncontrollable.And hydro-power has the characteristics of scale matching and strong regulation ability.Therefore,complementing wind,so-lar and water storage to form a new pattern for the development of large-scale clean energy bases in river basins is a key support for achieving the"dual carbon"goal and is also promoting the vigorous development of existing hydropower stations worldwide.But at the same time,with the transformation of hydropower function from"pow-er generation"to"power generation+regulation",its security and stability control will also face unprecedented challenges:On the one hand,traditional hydropower units require greater flexibility,safer operation and higher efficiency within a larger operating range,which is the main driving force for the research of new technologies in the hydropower industry.This requires the updating and upgrading of the hydraulic,mechanical,electromagnetic and structural design concepts and operating modes of hydropower units.On the other hand,traditional synchro-nous speed operation of hydroelectric units has begun to show its shortcomings,mainly manifested in efficiency decline,unstable operation,and structural failure due to insufficient operational flexibility under nondesign con-ditions.Although the stable and flexible operation of ultra-wide power units is not a new idea,as a possible so-lution to some technical challenges in the current hydropower industry,it will significantly increase the operating range and flexibility of units,which is conducive to increasing the share of renewable energy,highlighting the ur-gency and necessity of strengthening the research on key core technologies of ultra-wide power hydropower units.
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