In recent years, with the ever-increasing penetration of natural gas generation in actual power systems, it is necessary to consider the impacts of the natural gas systems on the planning and operation of the concerned power systems.Meanwhile, the interconnection of multiple energy sources represents one of the development trends of future energy systems.Hence, unified planning and operation of a power system and a natural gas system concerned are important issues to be addressed.Given this background, based on the steady-state gas flow model of natural gas systems, this paper preliminarily studies the unified planning of integrated electricity and natural gas energy systems.Firstly, we study the unified planning problem of integrated electricity and natural gas energy systems considering the boundary conditions of the electric power system and natural gas system, so as to optimally determine the locations and capabilities of natural gas-fired plants, transmission lines, natural gas supply stations and natural gas pipelines, and construct a mixed integer nonconvex nonlinear programming model (MINNPM).Then, we adopt the Benders decomposition algorithm to simplify the presented MINNPM into a two-level optimization framework including master and sub problems, which can be iteratively solved respectively by the commercial CPLEX and IPOPT solvers.Finally, we establish an integrated electricity and natural gas energy system including a 54-node power system and 19-node natural gas network to demonstrate the feasibility of the developed unified planning model based on Benders decomposition.%近年来随着天然气发电渗透率的逐步提高,电力系统规划和运行时就需要适当考虑天然气系统的影响.同时,多能源互联代表了未来能源系统的发展趋势之一.这样,电力系统和天然气系统的统一规划和运行就成为值得研究的重要问题.在此背景下,在考虑天然气系统稳态潮流模型的基础上,对电-气集成能源系统的统一规划进行了初步探索.首先,研究了考虑电力系统和天然气系统边界条件约束的电-气集成能源系统的统一规划问题,对燃气电厂、输电线路、天然气供给站、天然气管道的选址和定容进行优化,构造了混合整数非凸非线性规划模型.接着,采用Benders解耦将该混合整数非凸非线性规划问题简化为双层主、子问题,并分别采用高效的商业求解器CPLEX和IPOPT迭代求解.最后,采用所构建的包括54节点电力系统和19节点天然气网络相互耦合的电-气集成能源系统,说明了所发展的基于Benders解耦的统一规划模型的可行性.
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