多种可再生能源渗透场景下的热电联产系统优化

Optimization of Cogeneration System under Multiple Scenarios of Renewable Energy Penetration

针对传统热电联产(CHP)系统受热电耦合的限制,灵活调节能力低、可再生能源消纳能力弱的问题,分析了传统热电联产系统的灵活性不足机理,提出采用地热源热泵来提高其灵活性。为了确定地热源热泵(GSHP)的最优容量,建立了考虑切负荷惩罚、可再生能源弃用惩罚、设备投资成本及运行成本的热电联产-地热源热泵系统优化模型,将该模型运用到可再生能源渗透率(可再生能源发电量/总发电量)分别为15%,40%和55%的3种情景中。结果表明:地热源热泵的容量随可再生能源渗透率的提升而提升,同时地热源热泵的集成可以扩大系统的可运行域,提高可再生能源的消纳容量;在最优地热源热泵容量下,3种场景的日节约成本分别为38%,64%和70%,同时集成系统的能源利用率可超过100%,可再生能源弃用的惩罚成本分别下降100%,89%和89%。

Aiming at the problems that the traditional combined heat and power(CHP)system is limited by thermal-electric coupling,resulting in low flexibility and weak renewable energy accommodation,this paper analyzes the mechanism of insufficient flexibility of traditional CHP system and uses ground source heat pump(GSHP)to improve its flexibility.In order to determine the optimal capacity of GSHP,the optimization model of CHP-GSHP system considering load shedding penalty,renewable energy abandonment penalty,equipment investment cost and operation cost is established.The results show that the capacity of GSHP increases with the increase of renewable energy penetration,meanwhile,the integration of GSHP can enlarge the operational domain of system to improve the renewable energy accommodation capacity.This model is applied to three scenarios with renewable energy penetration rates(i.e.the ratio of renewable energy generating capacity and total power generating capacity)of 15%,40%and 55%,respectively.The results show that under the optimal capacity of GSHP,the typical daily costs in the three scenarios are saved by 38%,64%and 70%,the energy utilization rate of the integrated system exceeds 100%,and the penalty costs of renewable energy abandonment are reduced by 100%,89%and 89%respectively.