This paper proposes a system-wide optimal coordinated energy dispatch method for a multi-energy microgrid in both the grid-connected and islanded modes. The studied microgrid consists of multiple energy carriers covering the controllable generation units (fuel cell, electric boiler, combined cooling, heat and power plant and electric chiller), uncontrollable generation units (wind turbine and photovoltaic cell) and energy storage devices (battery storage, heat storage tank and ice storage tank). The proposed energy dispatch method aims to minimize the microgrid net operating cost and enhance the dispatch flexibility in supplying power, heat and cooling in the day-ahead energy market. For both the grid-connected and islanded microgrid, their dispatch models are formulated as the mixed-integer linear programming problems, which can be efficiently solved by the commercial solvers. Comprehensive case studies are performed to evaluate the effectiveness of the proposed method and then compared with the traditional dispatch methods which supply power and heat/cooling energies separately. Simulation results demonstrate that the proposed method can achieve much higher operating efficiency.

本文提出了并网和孤岛两种模式下的多能量微电网全系统最优协调能量分配方法。所研究的微电网由多个能量载体组成，这些能量载体涵盖了可控发电单元（燃料电池，电锅炉，联合冷却，热力发电厂和电冷却器），不可控发电单元（风力涡轮机和光伏电池）以及储能设备（电池储能，储热罐和冰储罐）。所提出的能量分配方法旨在最小化微电网的净运营成本，并在日前的能源市场中提高在供电，供热和制冷方面的分配灵活性。对于并网型和孤岛型微电网，其调度模型被表述为混合整数线性规划问题，可以由商业解算器有效地解决。进行了全面的案例研究，以评估该方法的有效性，然后与分别提供电力和热/冷能的传统调度方法进行比较。仿真结果表明，该方法可以实现更高的运行效率。