考虑不同运行模式的交直流混合微电网优化运行方法研究
发布时间：2018-09-02 10:00
【摘要】：微电网的经济调度是一门重要研究课题,它的目的是在满足负荷需求的同时实现综合成本的最优化,是微电网的经济效益得以体现的关键。交直流混合微电网为直流负荷和直流微源的并网和管理提供了便利的平台,其优化运行研究逐渐成为重要课题。交直流混合微电网具有与传统交流微电网相比独特的优点,可以提高控制效率、减小线路损耗、提高电能质量、给直流负荷的接入提供方便的平台。传统交流微电网的运行方式只有并网运行和离网运行两种,而交直流混合微电网具备更加灵活多样运行方式,在优化运行中需要考虑不同运行方式的影响以及模式之间的切换。针对交直流混合微电网相比于传统交流微电网更加复杂多样的运行模式,计及经济成本和环保成本,以交直流混合微电网综合运行成本最小为目标函数,计及交流区和直流区功率平衡约束等必要约束,建立了优化运行模型。所建立的模型因涵盖了交直流混合微电网在实际应用中的不同运行模式而更具适用性。在此基础上,建立了在预期模式切换下和非预期模式切换下的综合优化运行模型,保证了交直流混合微电网在模式切换下的效益最优。对粒子群算法引入混沌搜索的方法对其进行改进,采用改进后的混沌粒子群算法对所建立模型设计求解流程。仿真结果表明,交直流混合微电网在不同运行模式下的优化运行结果指标具有较大差异;交直流混合微电网的运行在计及模式切换的情况下,可预期模式切换比不可预期模式切换下优化运行指标更优。所建立的模型能够充分在实际运行中考虑不同运行模式的影响,保证了交直流混合微电网运行的经济性,并且更具备适应性。
[Abstract]:The economic dispatch of microgrid is an important research subject. Its purpose is to realize the optimization of comprehensive cost while satisfying the load demand, and it is the key to embody the economic benefits of microgrid. The hybrid AC / DC microgrid provides a convenient platform for the grid connection and management of DC load and DC microsource. Ac / DC hybrid microgrid has unique advantages compared with traditional AC microgrid. It can improve control efficiency, reduce line loss, improve power quality, and provide a convenient platform for DC load access. There are only two operation modes of traditional AC microgrid, grid-connected operation and off-grid operation, while the AC / DC hybrid microgrid has more flexible and diverse operation modes, so it is necessary to consider the influence of different operation modes and the switching between modes in the optimal operation. Compared with the traditional AC / DC microgrid, the AC / DC hybrid microgrid has more complex and diverse operation modes. Considering the economic cost and environmental protection cost, the objective function is to minimize the comprehensive operation cost of the AC / DC hybrid microgrid. Considering the constraints of AC and DC power balance, the optimal operation model is established. The model is more applicable because it covers the different operation modes of AC / DC hybrid microgrid in practical application. On this basis, a comprehensive optimal operation model under expected mode switching and unanticipated mode switching is established, which ensures the optimal benefit of AC / DC hybrid microgrid under mode switching. The particle swarm optimization (PSO) algorithm is improved by introducing chaos searching method, and the improved PSO algorithm is used to design the solution flow of the established model. The simulation results show that the optimal operation results of AC / DC hybrid microgrid are different in different operation modes, and the operation of AC / DC hybrid microgrid is considered in the case of mode switching. Predictable mode switching is better than unanticipated mode switching. The established model can fully consider the influence of different operation modes in actual operation, which ensures the economy of AC / DC hybrid microgrid operation and is more adaptable.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM732
[Abstract]:The economic dispatch of microgrid is an important research subject. Its purpose is to realize the optimization of comprehensive cost while satisfying the load demand, and it is the key to embody the economic benefits of microgrid. The hybrid AC / DC microgrid provides a convenient platform for the grid connection and management of DC load and DC microsource. Ac / DC hybrid microgrid has unique advantages compared with traditional AC microgrid. It can improve control efficiency, reduce line loss, improve power quality, and provide a convenient platform for DC load access. There are only two operation modes of traditional AC microgrid, grid-connected operation and off-grid operation, while the AC / DC hybrid microgrid has more flexible and diverse operation modes, so it is necessary to consider the influence of different operation modes and the switching between modes in the optimal operation. Compared with the traditional AC / DC microgrid, the AC / DC hybrid microgrid has more complex and diverse operation modes. Considering the economic cost and environmental protection cost, the objective function is to minimize the comprehensive operation cost of the AC / DC hybrid microgrid. Considering the constraints of AC and DC power balance, the optimal operation model is established. The model is more applicable because it covers the different operation modes of AC / DC hybrid microgrid in practical application. On this basis, a comprehensive optimal operation model under expected mode switching and unanticipated mode switching is established, which ensures the optimal benefit of AC / DC hybrid microgrid under mode switching. The particle swarm optimization (PSO) algorithm is improved by introducing chaos searching method, and the improved PSO algorithm is used to design the solution flow of the established model. The simulation results show that the optimal operation results of AC / DC hybrid microgrid are different in different operation modes, and the operation of AC / DC hybrid microgrid is considered in the case of mode switching. Predictable mode switching is better than unanticipated mode switching. The established model can fully consider the influence of different operation modes in actual operation, which ensures the economy of AC / DC hybrid microgrid operation and is more adaptable.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM732
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