峡口塘水电站机组增容设计比选

Comparison and Selection of the Unit Capacity Expansion Design Schemes for Xiakoutang Hydropower Station

峡口塘水电站位于乌江一级支流郁江上,是湖北利川县的多雨区,经调查分析,适当增加电站的装机容量,可以增加发电流量,减少弃水,较大幅度提升电站的调节性能,为系统提供辅助服务功能等也显著提升。为此拟定了四个增容方案,各方案的补充单位千瓦投资均小于初设;依现行电价政策,按增容收益的折算电量计算,增容的补充单位电量投资小于初设;按贷款利率6%计息,还贷年限也均小于初设,四个方案均可行。综合考虑投资指标、年发电收入和潜在效益等因素,推荐采用最优的方案四。

Xiakoutang Hydropower Station is located on Yujiang River,a first level tributary of Wujiang River,which is in a rainy area in Lichuan County,Hubei Province.Investigation and analysis show that appropriate expansion of the installed capacity of the station can increase the power generation flow and reduce the abandoned water,and significantly improve the regulation performance of the station.Also,it can improve the ability to provide auxiliary services for the system.Thus,four capacity expansion schemes are proposed and compared.It shows that the supplementary unit kilowatt investment of each scheme is less than the initial design.According to the current electricity pricing policy,the supplementary unit electricity investment of each scheme is less than the initial design based on the converted electricity from capacity expansion.If the interest is calculated at a loan interest rate of 6%,the repayment period of each scheme is also less than the initial design.It shows that the four schemes are all feasible.While,taking into account the factors such as investment indicators,annual power generation revenue,and other potential benefits,the optimal scheme is recommended.