考虑分级振动区的水电站厂内经济运行研究

In-plant economical operation of hydropower stations considering graded hydro-unit vibration zones

水轮发电机机组振动区是影响水电站厂内安全运行与经济运行的核心所在。本次研究采用机组分级振动区思想,根据机组承担不同负荷时的振动程度,划分机组振动区为禁止运行区、不建议运行区和稳定运行区,在此基础上,建立了考虑机组分级振动区的水电站厂内经济运行模型,并采用粒子群优化算法进行求解。以藏木水电站为例,厂内经济运行结果表明:以电定水模式下,综合考虑机组分级振动区影响比仅考虑机组禁止运行区影响时,全厂耗水量增加0.69%,但机组运行更为稳定,振动程度更小。考虑机组分级振动区的厂内经济运行模型更为契合水电站经济运行以安全运行为前提的实际思想。

Distinguishing hydro-unit vibration zones is the core that affects safe and economical operation of a hydropower plant.This study focuses on the difference in hydro-unit vibration intensity under different loads and adopts an idea of graded vibration zones,i.e.dividing the vibration zone into an operation-forbidden zone,an unrecommended zone,and a stable zone.Then,we construct an in-plant economical operation model of hydropower stations taking these graded zones into account,and solve it using a particle swarm algorithm.Application to the Zangmu hydropower station shows that in comparison to a single operation-forbidden zone,this new method predicts an increase as low as 0.69%in the water consumption by the plant operated in the allocated output mode,while keeping unit operation more stable with lower vibration.Thus,adoption of graded vibration zones improves model applicability to the real conditions of a hydropower station and helps find operation schemes that are more economical.