【作者】 李欢；

【导师】 曾君； 林伟；

【作者基本信息】 华南理工大学 ， 电气工程（专业学位）， 2021， 硕士

【摘要】 随着分布式发电相关技术的发展,越来越多的分布式电源在负荷侧分散接入配电网。在局部地区由分布式电源和本地负荷构成了微电网。微电网技术为新能源消纳提供了新的思路,甚至在海岛等特殊场景有不可替代的优势。合理规划微电网各类电源容量,是提高微电网规划运行稳定性和经济性的必然要求。本文围绕海岛风力光伏资源评估和微电网的容量规划进行了研究。所做的主要工作如下:(1)微电网初步选址和方案设计。收集了东头山海岛当地的气候和资源等信息,评估了当地电网情况和未来负荷发展情况,分析了该海岛建设微电网的必要性。结合当实际情况,提出了风-光-柴-储微电网的初步构想。经过实地勘察,选取合适的微电网初步选址方案,设计了微电网的初步接入方案。(2)采用基于概率函数模型,对海岛的风力和太阳进行资源评估。对风力和太阳资源评估采用不同的方法。风力资源采用Weibull函数拟合的办法,分析风速的概率密度,计算出海岛的风功率密度和年平均风速,评估海岛风力资源。太阳资源采用贝塔概率模型进行拟合,计算年水平面总辐射量和水平面总辐射度,评估海岛太阳资源。以此为海岛微电网组网方式和设备选型依据。(3)采用粒子群算法求解在孤岛运行模式下的微电网最优规划方案。以海底电缆出现故障,海岛电网形成孤岛运行为规划场景。采取建设和运行费用最小的目标函数,根据分布式新能源出力和经济模型,建立相应的约束,构建了混合整数规划模型。采用用粒子群算法对规划模型进行求解,得到最优的规划方案。对规划方案从停电时间、燃料价格等多维度进行敏感性分析,验证了规划方案具有较强的适应性。本文所提出的微电网规划方法,在工程应用中具有一定应用价值。更多还原

【Abstract】 With the development of technology,more and more distributed power sources are connected to the distribution network on the load side.In some areas,a microgrid is formed by distributed power sources and local loads.Microgrid technology provides new ideas for new energy consumption,and even has irreplaceable advantages in special scenarios such as islands.Reasonable planning of various power supply capacities of microgrids can improve the stability and economy of microgrid planning operations.The research centered on the evaluation of island wind photovoltaic resources and the capacity planning of microgrids.The main work done is as follows:(1)Preliminary site selection and scheme design of the microgrid.Collected the local climate and resource data of Dongshantou Island,assessed the local power grid situation and future load development,and analyzed the necessity of building a microgrid on the island.Combined with the actual situation,a preliminary plan for wind-light-diesel-storage microgrid was proposed.After on-site surveys,a suitable initial site selection plan for the micro-grid was selected,and the initial grid-connected plan for the micro-grid was designed.(2)The wind and photovoltaic resources of the island are evaluated using a probability function model.Different methods are used to assess wind and photovoltaic resources.Wind resources use the Weibull function fitting method to analyze the probability density of wind speed,calculate the wind power density and annual average wind speed of the island,and evaluate the island wind resources.The solar resources are fitted with a beta probability model to calculate the total annual horizontal radiation and the total horizontal radiation,and evaluate the solar resources of the islands.It is the basis for island micro-grid networking mode and equipment selection.(3)The particle swarm algorithm is used to solve the optimal planning scheme of microgrid in island operation mode.In the planning scenario,the microgrid operates independently when the submarine cable fails.A mixed-integer programming model is constructed to establish an objective function with the smallest construction and operating costs,and to establish corresponding constraints with distributed new energy output and economic models.The particle swarm algorithm is used to solve the planning model,and the optimal planning scheme is obtained.The sensitivity analysis of the planning scheme from multiple dimensions such as power outage time and fuel price verifies that the planning scheme has strong adaptability.The microgrid planning method mentioned in this article has certain application value in engineering applications.更多还原