含分布式电源配电系统的电压质量概率评估

发布时间：2018-01-18 13:36

本文关键词：含分布式电源配电系统的电压质量概率评估　出处：《兰州理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：近年来,能源危机和环境污染问题日益突出,促使利用可再生能源的分布式发电技术大力发展起来。但是,大多数分布式电源功率输出具有随机性,由此给电力系统配电系统带来了一系列电能质量问题,尤其表现在电压质量方面,使得电压质量评估变得更加复杂,如何合理地对含分布式电源配电系统的电压质量进行评估成为研究的重要问题。分布式电源的接入使得配电系统的运行和控制面临更多的不确定性,确定性潮流计算不再适用,为了考虑多种随机因素,引入了概率潮流的思想。本文提出了一种基于2n+1点估计法的概率潮流计算方法,引入到含分布式电源的概率评估当中,建立分布式电源、负荷的概率分布模型,通过概率潮流计算反映节点电压的概率分布及其统计量信息,结合半不变量和Gram-Charlier级数展开得出概率密度函数,分析比较了分布式电源接入前后对系统节点电压的影响。以含有分布式电源的IEEE-30节点系统作为算例,以蒙特卡罗法仿真得到的结果作为参考,验证了本文方法的有效性。在此基础上,又提出了一种基于2n+1点估计法的连续潮流算法并结合Cornish-Fisher级数,通过对接入配电系统的分布式电源及负荷建立功率输出的概率模型,对配电系统的节点电压静态稳定性和网络的负荷裕度进行概率评估。以IEEE-34节点配电系统作为算例,使用所提方法计算并与蒙特卡罗法的仿真结果比较,得出该方法能有效的评估配电系统的静态电压稳定性,具有速度快、精度高的优点。
[Abstract]:In recent years, the energy crisis and environmental pollution have become increasingly prominent, promoting the development of distributed power generation technology using renewable energy. However, most of the distributed power output is random. This brings a series of power quality problems to power distribution system, especially in voltage quality, which makes voltage quality evaluation more complex. How to evaluate the voltage quality of distribution system with distributed power has become an important problem. The access of distributed power supply makes the operation and control of distribution system face more uncertainty. The idea of probabilistic power flow is introduced in order to consider a variety of random factors. In this paper, a method of calculating probabilistic power flow based on 2n 1 point estimation is proposed. The probabilistic distribution model of distributed power supply and load is established, and the probability distribution of node voltage and its statistic information are reflected by the calculation of probabilistic power flow. The probability density function is obtained by combining semi-invariant and Gram-Charlier series expansion. This paper analyzes and compares the influence of distributed power supply before and after access to the system node voltage. Taking the IEEE-30 node system with distributed power supply as an example, the results obtained by Monte Carlo simulation are taken as reference. The validity of this method is verified. On this basis, a continuous power flow algorithm based on 2n 1 point estimation method is proposed and combined with Cornish-Fisher series. The probabilistic model of power output is established by means of the distributed power supply and load connected to the distribution system. The static stability of the node voltage and the load margin of the distribution system are probabilistic evaluated. The IEEE-34 node distribution system is taken as an example. The proposed method is used to calculate and compare with the simulation results of Monte Carlo method. It is concluded that the proposed method can effectively evaluate the static voltage stability of the distribution system and has the advantages of high speed and high accuracy.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM744

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