考虑管存动态特性的电-气-热综合能源系统低碳经济调度

Low-carbon Economic Dispatch of Electric-Gas-Heat Integrated Energy System Considering Dynamic Characteristics of Storage

电转气(P2G)和热电联产机组(CHP)作为综合能源系统耦合元件,是实现清洁低碳电力的重要途径。基于此,从P2G和CHP的协同机理着手,建立了考虑气管网储能特性的电-气-热互联综合能源日前调度模型。模型目标函数以日前调度成本、弃风成本和污染物治理成本之和最小,并计及了电网、气网约束条件,重点关注天然气系统管网的储气空间,以挖掘其管存动态特性。针对模型存在的非线性约束,采用二阶锥松弛和分段线性化将模型转化为混合整数凸优化问题进行求解。通过一个IEEE33节点电网和比利时20节点天然气网耦合的综合能源系统进行算例分析,结果验证了P2G和CHP的联合调度可以提升综合能源系统多项性能,管网动态特性对系统经济性具有积极作用。

As the coupling units in the integrated energy systems,power to gas(P2G)and combined heat and power(CHP)units are important ways to realize clean and low-carbon power system.In this respect,starting with analyzing the synergetic mechanism of power to gas and combined heat and power,a day-ahead dispatch model for electricity-gas-heat integrated energy system considering storage characteristic of pipeline was proposed.This model sets the minimum sum of cost of day-ahead dispatch,wind shedding,and pollutant treatment as the target function,electricity and gas network constraints were also included in this model,the gas storage of pipeline was concerned to excavate the dynamic characteristic of pipeline storage.In the light of the nonlinear constraints,the second order cone relaxation and piecewise linearization were adopted to transform this model into a mixed integer convex optimization.An integrated energy system coupled with IEEE33-nodes power system and Belgium20-nodes natural-gas system was employed for analog simulation.Results show that the joint dispatch of P2G and CHP can promote multiple performances of integrated energy system,and the dynamic characteristic of pipeline storage can increase the economy of the system.