风-火-储耦合系统储能容量配置优化对比

Comparison of Storage Capacity Configuration Optimization in Wind-Thermal Power-Storage Coupling System

为提升风电富集区域风电消纳水平及燃煤机组的灵活性,提出了基于热电共蓄式压缩空气储能的风-火-储耦合系统及系统调度策略,建立了系统的容量配置优化框架,并对7种布局方案进行了多目标优化。优化结果表明:电锅炉将弃风电量转化为热量时,燃煤机组的运行点向电力负荷下限更低的区域移动,风电上网空间增大,燃煤机组出力水平降低;加入热电共蓄式压缩空气储能子系统,使得燃煤机组电功率水平降低;换热器废热的回收进一步降低了燃煤机组产热水平;通过调整燃煤机组热出力,抽汽蓄热子系统能够实现抽汽热的时空平移,促使燃煤机组运行点向电力负荷下限更低的区域移动,可间接促进风电的消纳。综合来看,3种子系统相组合的最佳耦合方案可实现燃煤机组的热电解耦,从而提升了其深度调峰能力,在更大程度消纳风电能力的同时提升了系统的效率和环保性。

In order to improve wind power penetration level and the coal-fired units’flexibility in wind power-rich areas,a wind-thermal power-storage coupling system based on combined heat and compressed air energy storage system and scheduling strategy are proposed,and a capacity configuration optimization framework is established.Multi-objective optimization is carried out on 7 layout schemes.The optimization results reveal that when the electric boiler converts waste wind power into heat,the operation point of coal-fired units moves towards areas with lower power limit,increasing the wind power adoption space,and reducing the output level of coal-fired units.The addition of combined heat and compressed air energy storage subsystem reduces the electrical power level of coal-fired units.In addition,the recovery of waste heat from heat exchangers further decreases the heat generation level of coal-fired units.The extraction heat storage subsystem achieves spatiotemporal translation of extraction steam heat by adjusting the thermal output of coal-fired units,and makes the operation point of coal-fired units move towards areas with lower power load limit,indirectly promoting the wind power consumption.In summary,the optimal coupling scheme combining the three subsystems can realize the heat power decoupling of coal-fired power units,promote the ability of deep peak shaving,possess greater capacity to absorb wind power and improve system efficiency and environmental friendliness.