基于MICP的多能耦合综合能源系统可再生能源消纳能力研究

Research on Renewable Energy Absorption Capacity of Multi-energyCoupling Integrated Energy Systems Based on MICPWANG

受限于电力系统资源禀赋,可再生能源消纳能力瓶颈始终制约着可再生能源的大力发展。近年来蓬勃发展的综合能源系统因其多能耦合属性,可将电力系统盈余电量转移至气/热/氢等其他能源子系统进行消纳,为可再生能源消纳提供了全新思路。然而,由于综合能源系统多能耦合复杂、规模大、维度高、非凸非线性强,如何准确评估其可再生能源消纳能力是一项难题。基于电/气/热/冷等能源子系统物理特性构建了综合能源系统可再生能源消纳模型,以评估多能耦合作用下系统对可再生能源的消纳能力极限;然后,提出凸松弛及近似方法将混合整数非线性规划原问题转化为混合整数锥规划问题,实现模型的有效求解;最后,以改进的IEEE-39节点电力系统和比利时20节点天然气系统为基础构建了电-气-氢-热-风-光耦合综合能源系统算例,论证了多能耦合对于可再生能源消纳的提升作用,并深入挖掘了不同节点对于可再生能源的接纳能力差异。

Limited by the resource endowment of the power system,the bottleneck of renewable energy absorptioncapacity has always restricted the development of renewable energy.In recent years,integrated energy systems have beenwidely used owing to their multi-energy coupling property.They can transfer the surplus power of the power system to otherenergy subsystems such as gas/heat/cold for consumption,providing a new idea for the consumption of renewable energy.However,owing to the complex multi-energy coupling,large scale,high dimension,and strong non-convex nonlinearity of theintegrated energy system,accurately evaluating its renewable energy absorption capacity is difficult.In this study,consideringthe physical characteristics of energy subsystems such as electricity/gas/heat/cold,a renewable energy absorption model of theintegrated energy system was developed to evaluate the limit of the system’s renewable energy absorption capacity under themulti-energy coupling effect.Then,a convex relaxation and approximation method was developed for transforming the originalmixed-integer nonlinear programming problem into a mixed-integer conic programming problem,for solving the model.Finally,on the basis of the improved IEEE-39 node power system and the Belgium 20 node natural gas system,a numericalexample of an electricity/gas/hydrogen/hydrothermal/wind/optical coupling integrated energy system was constructed.Themodel is used to demonstrate the enhancement of renewable energy integration through multi-energy coupling and to thoroughlyinvestigate the variations in the capabilities of different nodes to accommodate renewable energy.