随机性电源接入配电网的电能质量评估研究

发布时间：2018-01-16 04:01

本文关键词：随机性电源接入配电网的电能质量评估研究　出处：《沈阳工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着国民经济快速的发展,用电量逐年不断剧增,电网规模不断扩充。在此背景下,随机性电源客户由其环保、可靠性、成本低等优点逐渐成为主力军,但大量的随机性电源客户并网会带来电能质量问题。因此,研究随机性电源客户电能质量评估具有重要的实际意义。针对随机性电源的特征和电能质量评估的需求,并考虑到现有电能质量评估的研究水平,提出了概率统计与矢量代数相结合的评估模型方法,分别评估电能质量指标单项评估和电能质量指标综合评估。本文基于概率统计与矢量代数相结合的评估模型法对随机性电源光伏与风机进行并网和离网电能质量指标单项分析,分别分析在并网和离网状态下,影响电能质量的指标,为并网时电能质量的治理和离网时自给自足的电能质量治提供一定的参考价值。权重是电能质量综合评估中排列各指标重要顺序的关键一步。本文采用层次分析法确定权重,但传统层次分析法确定权重时存在一致性验证及判断精度不准确和差异性不够明显等问题。据此,引进改进层次分析法改进传统层次分析法的缺点,主要采用三标度法确定判断矩阵,并通过最优矩阵转化成一致性矩阵,避免了传统层次分析法的一致性验证、判断精度不准确和差异性不明显的问题。最后,通过实例验证随机性客户的电能质量指标综合评估来掌握整体电能质量的状况。
[Abstract]:With the rapid development of the national economy, power consumption is increasing rapidly year by year, and the scale of power grid is expanding. In this context, random power supply customers gradually become the main force by its environmental protection, reliability, low cost and other advantages. But a large number of random power customers will bring power quality problems. It is of great practical significance to study the customer power quality assessment of random power supply. Considering the characteristics of random power supply and the needs of power quality evaluation, and considering the existing research level of power quality assessment. An evaluation model combining probability and statistics with vector algebra is proposed. The evaluation model based on probabilistic statistics and vector algebra is applied to the grid-connected and off-grid power quality of random power supply photovoltaic and fan. Single analysis of indicators. The indexes that affect the power quality are analyzed in the connected and off-grid states respectively. This paper provides a certain reference value for the governance of power quality when connected to the grid and the self-sufficient power quality treatment when off the grid. The weight is the key step to arrange the important order of each index in the comprehensive evaluation of power quality. This paper adopts the analytic hierarchy process (AHP). Method to determine the weight. However, the traditional analytic hierarchy process (AHP) has some problems such as consistency verification, inaccurate judgment accuracy and insufficient difference. Therefore, the shortcomings of the improved AHP to improve the traditional AHP are introduced. The three-scale method is mainly used to determine the judgment matrix, and the optimal matrix is transformed into the consistency matrix, which avoids the problems of consistency verification of traditional analytic hierarchy process (AHP), inaccurate judgment accuracy and indistinct difference. Finally. The comprehensive evaluation of the power quality index of random customers is verified by an example to grasp the overall power quality situation.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM711

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