计及微电源效率约束的多源微网优化调度

Optimized Scheduling of Multi-source Microgrid Considering Micropower Supply Constraints

随着"煤改电"、"煤改气"工程的推进,天然气供应紧张问题爆发,这对含多种能源结构的微电网优化调度提出了更高要求。考虑天然气系统与微电网的气-电耦合关系,研究受微电源效率约束与天然气系统传输限制的多源微网优化调度问题。首先,针对气-电耦合的微网系统,建立各微电源模型,重点考虑天然气供应不足的影响,建立微型燃气轮机出力、效率、燃料流量间的空间关系,确定其最优出力范围及与效率的约束关系。进而,以微电网系统的运行成本、与电网的交互成本、污染气体惩罚成本最小为目标,建立多源微网优化调度模型,并采用粒子群算法求解。最后通过仿真验证所提调度模型可有效提高微电网的运行经济性。

Implementation of"coal to electricity"and "coal to gas"and natural gas shortage lead to higher requirement for optimized scheduling of the microgrid.This paper studies optimized scheduling restricted by micro-power supplies efficiency and the transmission limit of natural gas system in a multi-supply microgrid,considering coupling relationship between natural gas and electric power system.Firstly,the gas-electric coupled system for micropower supplies models are built.The three-dimensional relationship of efficiency,output and the fuel flow is put forward focusing on the impact of natural gas shortage,determining its optimal output rang and efficiency.Secondly,the optimized scheduling model of multi-supply microgrid is built to minimize the operational and environmental cost and the energy exchange expense.Finally,the simulated result verifies that the proposed scheduling model can efficiently improve the micro grid operation economy.