电能质量综合评估方法研究

发布时间：2018-02-27 09:29

本文关键词： 电能质量评估体系谐波评估数学包络分析综合评估　出处：《郑州大学》2014年硕士论文　论文类型：学位论文

【摘要】：电能质量的好坏与我们的生活息息相关，特别是对电能质量敏感的工业用户，良好的电能质量直接关系到企业的经济效益。随着新型电子设备不断出现，非线性负荷日趋增加，电能污染也日趋严重。对电能质量进行科学有效的评估，是治理电能污染的基础条件，不但对提高电力系统供电质量有着重要作用，对整个国民经济都有着重要意义。本文首先结合国内外的电能质量标准对电能质量的相关概念及各种指标进行了分析。然后介绍了电能质量的评估体系，并对现有的电能质量单项指标评估方法和多指标综合评估方法进行了研究。对于单项谐波指标评估建立了一种基于模糊相似和接近度的评估方法。将评估对象的谐波指标序列与设定的谐波评估等级序列进行比较分析，得到评估对象的谐波隶属等级，再利用多种模糊贴近度构成的接近度指标，分析隶属等级，得出评估对象对于最优等级及相邻等级的隶属度，，详细评估谐波污染情况。对于电能质量综合评估建立了一种基于数据包络分析的综合评估方法。确定电能质量指标评估体系，根据数据包络分析的基本原理，把电能质量各项指标的实测数据与国家标准的偏差作为投入指标，电能质量评估等级作为产出指标，利用数据包络分析方法对决策单元进行分析，得到各决策单元的有效率，对各单元有效率进行分析，得到待评价单元的评估等级。运用数据包络分析方法避免了权重选取对于电能质量评估的影响。通过算例验证，证明该方法在客观准确的同时有很好的适应性。
[Abstract]:The quality of power quality is closely related to our daily life, especially for industrial users who are sensitive to power quality. Good power quality is directly related to the economic benefits of enterprises. With the continuous emergence of new electronic equipment, nonlinear load is increasing day by day. Electric energy pollution is becoming more and more serious. Scientific and effective evaluation of power quality is the basic condition to control power pollution. It not only plays an important role in improving the power supply quality of power system, but also plays an important role in the whole national economy. In this paper, the related concepts and indexes of power quality are analyzed in combination with domestic and foreign power quality standards, and then the evaluation system of power quality is introduced. The existing power quality single index evaluation method and multi-index comprehensive evaluation method are studied. An evaluation method based on fuzzy similarity and proximity is established for the evaluation of single harmonic index. The harmonic index sequence of the evaluated object is compared with the set harmonic evaluation grade sequence, and the harmonic membership level of the evaluated object is obtained. Then, by using a variety of fuzzy closeness index, the membership grade is analyzed, and the membership degree of the optimal grade and adjacent grade is obtained, and the harmonic pollution is evaluated in detail. A comprehensive evaluation method based on data envelope analysis is established for the comprehensive evaluation of power quality, and the evaluation system of power quality index is determined, according to the basic principle of data envelope analysis, Taking the deviation between the measured data of the power quality indexes and the national standards as input indexes and the power quality evaluation grade as the output indexes, the decision making units are analyzed by using the method of data envelopment analysis, and the efficiency of each decision making unit is obtained. The efficiency of each unit is analyzed and the evaluation level of the unit to be evaluated is obtained. The influence of weight selection on power quality assessment is avoided by using the method of data envelopment analysis. It is proved that this method has good adaptability while it is objective and accurate.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：F426.61

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