含热电联供系统的微网经济运行

Economic operation of microgrid with combined heat and power system

为了分析热电联供系统和储能技术的经济节能作用,在分时电价以及微网并网运行的环境下,建立包含光伏、风电、热电联供系统、燃料电池以及储能系统的微网经济优化模型。采用方程线性化的方法将优化问题转化为混合整数线性规划(MILP)问题。算例分析验证了模型与算法的准确性,并比较了微网采用与不采用热电联供系统以及采用储能单元的经济效益,结果表明热电联供系统具有显著的经济效益,电储能带来的经济效益比热储能高。

For analyzing the economic and energy-saving effect of CHP（Combined Heat and Power） and energy storage,an economic optimal model including photovohaic,wind power,CHP system,fuel cell and energy storage system is built for grid-connected microgrid with time-dependent electricity price. Equation linearization is used to convert the optimization problem into the MILP（Mixed-Integer Linear Programming） problem. Case analysis verifies the correctness of the proposed model and algorithm. The economic benefits are compared between the microgrids with and without the CHP system and energy storage unit,which shows that,CHP system has significant economic effect and the economic benefit brought by electric energy storage is higher than that by heat energy storage.