【作者】 唐会智；

【导师】 彭建春； 罗明钧；

【作者基本信息】 湖南大学 ， 控制工程， 2004， 硕士

【摘要】 随着电力系统规模的不断增大，电力系统中的整流型、冲击性等非线性负荷日益增多。这些非线性负荷的存在，往往导致电网发生电压畸变、电压波动、电压闪变和三相不平衡等电能质量问题，使电网供电质量降低、甚至恶化电网运行状况。近年来，由于电能质量引发的纠纷和电网事故呈上升趋势。对电能质量的管理和对电力污染的治理工作显得日益突出。 本文围绕电能质量这一主题，首先论述了电能质量的基本内容，恒量电能质量各项指标的基本概念，以及电能质量问题的基本定义；接着论述了影响电能质量各项指标的主要因素、主要危害；然后对电能质量的标准进行了探讨，介绍了我国的电能质量标准以及国外的电能质量标准；针对模糊理论的基本概念和方法，剖析了它们应用于电能质量综合评价的可行性与优势；基于模糊理论，设计了电能质量模糊综合评判的一级、二级和最终评判方法。这种方法综合考虑了电能质量的各项指标，根据它们对电能质量的不同影响程度，给出相对应的权重，利用加权平均法对评判结果进行处理得到最终评判结果。 利用现场实测数据，阐述了本文的综合评判方法的分析过程及其结果。理论和仿真分析表明，本文方法合理、有效，对电力市场中电能质量的描述有理论和实际意义。更多还原

【Abstract】 With the continuous development of electric power system, more and more nonlinear loads, such as rectifier loads and impulse loads, added increasing to the modern electric power systems. The existence of these nonlinear loads in power systems will results in bad power quality, such as voltage distortion, voltage fluctuation, voltage flicker and three phase unbalance. As a result, the power supply quality and the operation condition of the power system are exacerbated. In recent years, the disputes and faults induced by power supply quality trend to ascent. It is increasing important to manage power supply quality and treat the electric pollutions.This thesis focus on the subject of power quality. First, the basic contents of electric power quality, individual indexes describing power quality, and definitions of power quality are investigated in detail; Then, the main causes and harms influencing power quality indexes are presented; And then, the standards of power quality are discussed, based on the analysis of the power quality standards adopted in and outside our country; Based on the analysis of the concepts and methods of fuzzy logic, the feasibility and merits of applying the fuzzy logic theory to power quality complex appraising are revealed. A new power quality complex appraising method is proposed, which consists of the first-grade appraising, the second-grade appraising and the final appraising. The appraising method fuses all indexes describing the electric power quality. Weights corresponding to each power quality indexes are introduced to consider the impacts of individual power quality indexes on the final unique power quality index.The field data are adopted to illustrate the proposed method. The analysis procedure and the calculation of complex power quality index are given. The theoretical and simulation results show that the proposed method is reasonable and effective. The proposed method is meaningful for appraising electric power quality in electricity markets.更多还原