考虑供能网络约束的园区型电热综合能源系统优化配置

Optimal Configuration of Park Electricity-heat Integrated Energy System Considering Network Constraints

搭建了园区型综合能源系统的基本网架结构,建立了热泵机组、热电联产机组、蓄热罐、电锅炉、电制冷机、余热吸收式制冷机的数学模型,构建了考虑园区供能网约束的双层优化配置模型。模型上层以最小化园区能源站的年综合投资成本为目标,模型下层以系统的年运行费用最低为目标,并基于配电网的Distflow二阶锥模型和线性热网络方程建立供能网络模型。在规划求解过程中,引入了二阶锥松弛技术对模型的电网潮流约束进行凸优化松弛,同时采用了线性热网络方程,以提升模型的可解性和计算速度。最后在改进的IEEE 33节点配电网和8节点供热系统中进行了算例分析,结果表明,所构建的系统优化配置模型在一定程度上提高了园区型综合能源系统的经济性,验证了所提模型的有效性。

This paper builds the basic grid structure of the park-type integrated energy system,establishes the mathematical models of heat pump units,cogeneration units,heat storage tanks,electric boilers,electric refrigerators,and waste heat absorption refrigerators,and constructs a double-layer optimal configuration model considering the constraints of the park’s energy supply network constraint.The upper layer of the model aims to minimize the annual comprehensive investment cost of the energy station in the park,and the lower layer of the model aims at the lowest annual operating cost of the system.Based on the Distflow second-order cone model of the distribution network and linear heat network equation the energy supply network model is established.In the process of planning and solving,the second-order cone relaxation technology is introduced to perform convex optimization relaxation on the power flow constraints of the model.At the same time,linear heat network equations are used to improve the solvability and calculation speed of the model.Finally,an example is analyzed in the modified IEEE 33-node distribution network and 8-node heating network system.The results prove that the system optimization configuration model constructed improves the economy of the park-type integrated energy system to a certain extent,and verifies the effectiveness of the proposed model.