考虑热载荷能力的风火打捆外送电线路截面和火电容量联合优化

Joint optimization of wind-thermal bundling transmission line cross-section andthermal power capacity considering heat capacity

风火打捆外送电可以用火电来平抑风电的波动,提高线路的利用率,是大规模消纳风电的重要途径,所以风火打捆外送电线路和配套火电的选择至关重要。而外送电线路可输送的容量又与其截面和环境温度有关。考虑线路热载荷能力即考虑环境温度影响,提出风火打捆外送电线路截面和火电容量联合优化的方法。该方法综合考虑送出风电及火电的收入、火电的总成本、线路投资成本和风电弃风成本对社会效益的影响。算例表明:该法与不考虑热载荷能力的方法相比能充分发挥线路的输电能力,增加社会效益。

Wind-thermal bundling external power transmission use thermal power to suppress the fluctuation of wind power and improve the utilization rate of the line.It is an important way to absorb wind power on a large scale.Therefore,the choice of wind-thermal bundling external power transmission lines and supporting thermal power is crucial.And the transmission capacity of the external power transmission line is related to its cross section and environmental temperature.Considering the line heat capacity or namely the influence of environmental temperature,this paper proposes a method to optimize transmission line cross-section and thermal power capacity of wind-thermal bundling external power.This method comprehensively considers the impact of wind power and thermal power income,total cost of thermal power,line investment cost,and wind curtailment cost on social benefits.The calculation example shows that this method can give full play to the transmission capacity of the line and increase social benefits compared with the method without considering the thermal load capacity.