考虑三相潮流的微网经济运行研究

摘要

Traditional symmetric economic dispatch models are not applicable to the microgrid with distributed generations because of the unbalance in microsources and loads. An optimization model of economic operated CHP microgrid system considering three-phase power flow and heating income is established. The microsources can provide both active and reactive power in the model. The Benchmark microgrid consisting of a wind turbine, photovoltaic cells, a storage battery, a micro turbine, a fuel cell, heating and electric loads is selected. The improved genetic algorithm is used to optimize microsources’ active and reactive output for grid-connected mode considering spot price. Node voltage quality is verified, and optimization results for microsources adopting different power flow models are comparatively analyzed. So the validity of the proposed model and algorithm is proved by the examples.%　　由于微网中微源和负荷存在不对称性，传统的对称经济调度模型已不适用于此类系统。在考虑三相潮流以及微源同时提供有功和无功出力的基础上，建立了计及制热收益的热电联产型微网系统经济运行模型。以一个包含风、光、储、微型燃气轮机、燃料电池以及热电负荷的 Benchmark 微网为例，运用改进遗传算法优化了考虑实时电价的并网运行方式下各微源的有功、无功出力，验证了节点电压质量，并对比分析了微源采用不同的潮流计算模型对系统经济运行优化结果的影响。通过算例验证了所提模型和算法的有效性。