【作者】 王琛；

【导师】 李扬；

【作者基本信息】 东南大学 ， 电气工程， 2017， 硕士

【摘要】 随着电力系统的发展,分布式电源(distributedgeneration,DG)接入配电网的渗透率日渐增加。由于DG出力具有不确定性,这对传统配电网规划带来了新的挑战,研究DG的不确定性以及新的规划模型和方法是解决这类问题的主要着眼点。同时,随着配电网的发展,尤其是越来越多的分布式发电项目的接入,对实际规划人员要求和工作量不断提高,研究辅助规划系统有助于提高员工工作效率,解决实际配电网规划中出现的问题。本文对考虑DG不确定性的配电网规划问题进行了深入的研究,对DG、负荷随机模型进行了总结,基于模糊理论构建综合不确定因素评估方法对DG不确定性进行了分析与评估,分析得到DG接入对配电网规划的影响;提出了基于机会约束和双层规划理念采用启发式算法重点解决考虑DG接入的负荷点分配、潮流不确定、出力不确定等复杂规划问题;研发配电网辅助规划平台,实际解决规划人员现实中的规划评审问题,提高了工作效率。主要工作包括:1、简要介绍DG种类及特点,重点对风力、光伏、燃气机组与燃料电池、负荷的不确定模型进行研究。对常见的风速、光照强度、燃气机组与燃料电池出力和负荷的分布函数进行了归纳,为研究内容奠定理论基础。2、对DG的不确定性因素进行分类,将分布式发电的不确定性因素分成三类:自然因素、市场因素以及政策因素。在模糊数学理论和层次分析法的基础上,构建分布式发电不确定性的综合模糊评估方法,对我国的增量配电网与存量配电网进行DG不确定性分析,经算例分析,总结出DG不确定性对配电网规划的影响,为配电网规划提供理论支撑作用。3、根据机会约束和双层规划的思想,提出了考虑DG的不确定性的配电网规划模型,该模型充分考虑DG与负荷的不确定性,并采用遗传算法求解第一层规划的配电站选址问题,采用Voronoi求解第二层规划的负荷点分配问题,结合增量配电网算例,对含DG与无DG两类场景进行算例分析,证明该模型以及算法的适应性,为配电网规划提供理论依据。4、考虑实际规划工作,研发了一款基于C#、ASP.NET技术的配电网规划辅助平台,提出将分布式发电项目与传统配电网项目按l0kV线路进行归纳,以线路负载率与电网运行充裕度作为规划评审的参考,实现对分布式发电项目与传统配电网项目的分部门上报、按线路统一规划、统一评审,对配电网项目的规划和管理提供辅助支撑作用,成倍提升工作效率,为实际规划工作提供辅助服务。更多还原

【Abstract】 With the development of power system,the role of distributed generation(distributed generation,DG)on the power distribution network becomes increasingly important.Due to the uncertainty of DG output,this presents a new challenge to the traditional power distribution network planning.Thereby,through studying the uncertainty of DG and developing new planning models and approaches are the main strategies to resolve this problem.At the same the time,with the development of the power distribution network,specifically with the integration of more and more distributed power generation programs,the requirements and workload of the planning staff continue to increase.However,researching supplementary power distribution network planning systems will help improve staff efficiency,and solve problems that occur during power distribution network planning.This paper studies the power distribution network planning problems caused by the instability of DG.DG and load stochastic models are summarized in this paper.The uncertainty of DG based on the fuzzy mathematic theory is analyzed and evaluated,and the influences of DG access to the distribution network planning are analyzed.On the programming model and heuristic algorithm was proposed for solving the distribution network planning model considering DG uncertainty problems,solving the DG access point load distribution,trend of uncertainty,uncertainty of output complex programming problem.Supportive distribution network planning system is developed in this paper,to solve the actual planning staff planning problems in reality,to improve the working efficiency.1.The types of DG and their characteristics are briefly introduced.Then,the load uncertainty models of wind power,PV,gas turbine,and fuel cell are studied thoroughly.The distribution function of common wind speed,light intensity,gas unit and fuel cell output and load are summarized,which lays the theoretical foundation for the later research contents.2.The uncertainty factors of DG are classified,where the uncertainty factors of distributed power generation are divided into three categories:natural factors,market factors and policy factors.Based on fuzzy mathematic theory and the analytic hierarchy process,a comprehensive fuzzy evaluation method for DG uncertainty is constructed.DG uncertainty analysis is carried out for China’s incremental power distribution network and stock power distribution network.Combining the case studies,the research summarized the influence of DG uncertainty on power distribution network planning,and provided theoretical support for distribution network planning.3.Based of the ideas of opportunity constraint and bi-level planning,a power distribution network planning model that considers the uncertainty of DG is proposed.The model takes into account the uncertainties of DG and load,and uses the genetic algorithm to solve the power distribution station site selection problems in the first layer plan.Furthermore,Voronoi is used to solve the problem of load point distribution in the second layer plan.Combined with the examples of incremental power distribution network,this project created a case study where it analyzed the situation of DG and No DG.Through this method,the adaptability of the algorithm and model are proven,thereby provide theoretical basis for distribution network planning.4.Considering the practical planning work that is yet to come,this project developed a C#and ASP.NET based supportive system for power distribution network planning.Also,the project proposed to merge distributed generation projects and the traditional distribution network is proposed to the project according to 10 kV lines,with a load rate and power grid operation abundance degree serving as factors of planning and review.Implementation of distributed power generation projects and the traditional distribution network project department report,according to the line,unified planning,unified reviews provide auxiliary support for distribution network planning and project management role,multiplied improve work efficiency and provide assistance to the actual planning work.更多还原