考虑可中断负荷的微网能量优化

建立能量模型协调优化微网可靠性与经济性对系统经济效益的提高至关重要.考虑在并网模式和孤岛模式下都将可中断负荷纳入微网能量管理,优化各分布式电源DG(distributed generation)出力,并网时还包括微网与主网交换功率,使微网投资运行费用和补偿停电损失费用之和最小.该模型不但考虑了微型燃气轮机热(冷)电联供的发电特性,而且将热(冷)能供给优化转化为电能供给优化统一求解,回避冷热价格对模型求解影响,简化微网综合供能模型.以一个微网系统算例验证了模型和算法的有效性,计算结果表明该方法不但能确保微网负荷的可靠、经济供电,也有利于主网整体经济供电能力的提高.

Microgrid Energy Optimization Considering Interruptible Load

Establishing energy model to coordinate and optimize the reliability and economy of microgrid system is significant to enhance economic benefits of the system.As considering that the interruptible load can be incorporated into the microgrid energy management under both grid-connected mode and island mode,the model can optimize different kinds of DG output to make lowest cost sum of the investment,operation and interruption,which should include the exchanging power between microgrid network and main network under the grid-connected mode.In this model,not only the generation characteristics of heat,cool and power cogeneration system of micro gas trubine are considered,but also the optimization of both heat and cool energy is converted to the optimization of power supply for the unified solving.Thus,the cold and heat price can be avoided to influence the model solution,which simplifies the comprehensive power-supply model of microgrid system.Then,the effectiveness of the model and the algorithm is verified by a case of microgrid system.The results show that not only the reliable,economic power supply of microgrid load can be ensured,but also the whole economic power supply of main network can be enhanced.