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针对一种含光伏、蓄电池和冷热电联供的微网,在满足用户多种能源需求和联网运行的条件下,对系统中的微型燃气轮机、余热锅炉和制冷机等主要供能设备采用基于部分负荷(part load ratio,PLR)特性的模型,建立了以总运行成本最低为目标的微网日前动态经济调度的0-1混合整数非线性规划模型。通过求解某个楼宇CCHP型微网夏季典型日的算例,从优化调度方案、总运行费用等方面,比较了系统设备采用部分负荷特性模型和固定效率模型时的调度优化差异。结果表明,两种模型对于调度结果的误差不可忽略,部分负荷特性模型的结果更为准确;值得注意的是冷负荷所造成的模型误差比较显著。
Aiming at a kind of microgrid which contains photovoltaic, accumulator and cogeneration, under the conditions of satisfying users’ various energy demands and networking operation, the main energy supply equipments such as micro-gas turbines, waste heat boilers and refrigerators in the system are adopted based on Part load ratio (PLR), a 0-1 mixed integer non-linear programming model was set up with the goal of lowest total operating cost. By solving the summer typical day of a building CCHP type micro-grid, this paper compares the scheduling optimization differences when the system equipment adopts the partial load characteristic model and the fixed efficiency model from the aspects of optimal scheduling scheme and total operating cost. The results show that the errors of the two models can not be ignored for the scheduling results, and the results of the partial load characteristic model are more accurate. It is noteworthy that the model error caused by the cold load is quite significant.