基于供热网络热惯性的风电消纳能力评估

Evaluation of Wind Power Absorption Capacity Considering Thermal Inertia of Heating Network

在传统的热电联产调度中,电功率和热功率之间的平衡关系时刻受到限制,导致系统调峰能力下降、弃风率过高。基于此,考虑了区域供热网络(DHN)的实际物理模型,利用DHN的热惯性进行蓄热,用于提高热电联产(CHP)机组的运行灵活性。该文构建了供热网络的热惯性模型,并引入供、回水时滞性来描述热水在网络中的传输时延,以系统运行成本及弃风量最小为目标函数,考虑了系统常规约束和热力系统模型约束,建立了包含风电机组、火电机组、热电联产机组和热惯性的电-热综合系统优化模型。结果表明,所提模型不仅可以减小系统弃风率,还可以获得热源处优化后的供水和回水温度。

The balance between the electric power and the thermal power is always restricted in the traditional combined heat and power scheduling,which leads to a decrease in the peak shaving capacity of the system and an excessive wind abandonment rate.To this end,considering the actual physical model of the district heating network(DHN),the thermal inertia of the DHN is used for heat storage to improve the operational flexibility of the combined heat and power(CHP)unit.This paper constructs a thermal inertia model of the heating network,and introduces the time lag of supply and return water to describe the transmission delay of hot water in the network.With the minimum of the system operating cost and the amount of abandoned wind as the objective function,taking account of the conventional system constrains and constrains of the thermal system model,an optimization model of an integrated electricthermal system including a wind turbine,a thermal turbine,a combined heat and power unit and thermal inertia is established.The results show that the proposed model can not only reduce the abandoned wind rate of the system,but also obtain the optimized supply and return water temperature at the heat source.