【作者】 戴卫；

【导师】 牟道槐；

【作者基本信息】 重庆大学 ， 电力系统及其自动化， 2002， 硕士

【摘要】 随着电力系统的发展，电力生产正在由计划经济向市场经济转变，在电力市场条件下，供电表现为一种商业服务行为，电能作为一种商品，同其它商品一样具有质量属性，而用户对电能质量的要求越来越高。因此，保证良好的供电质量是电力市场的客观需要，同时，也是促进社会文明、安定的重要因素。 电能质量指的是电网中各点电压或电流的幅值与波形符合标准的程度，它的优劣由电网的结构和负荷的性质两个方面确定。随着电力电子技术的发展，电力系统中出现了大量非线性负荷，这些非线性负荷向电网注入大量的谐波电流并引起三相电压不对称。另外，电力系统中的冲击负荷也引起电压波动和闪变，不对称负荷引起三相电压不平衡。以上因素造成电能质量的下降，并严重影响了人们的正常生产和生活。 本文分析了电能质量下降的原因及其危害，介绍了目前国内外改善电能质量的若干种方法。作者还针对永川电网的电能质量现状进行了调查，分析了其电网结构，并对其电能质量进行了测量、计算，最后，在此基础上提出了改善永川电网电能质量的措施，以指导电网的规划、建设与管理，具有理论意义和重要的实用价值。更多还原

【Abstract】 With the development of power system, the power product is turning from planned economy to market economy, in the power market, power supply behaves as a kind of financial service, being as a merchandise, power has quality like the other merchandises. The power user’s demand for power quality is more and more higher. So ensuring power quality is an impersonal demand of power market, at the same time, is an important factor for promoting the civilization and stabilization of social.Power quality presents the degree of magnitude and wave of the voltage or current of every point in the power system to meet the standards, it is confirmed by the construct of power system and the properties of loads. With the development of the technology the power electric, nonlinear loads have appeared in the power system, these nonlinear loads brought about a large amount of harmonic to the power system, and caused imbalance of three-hpase voltage. In addition, the impulse loads caused voltage wave and flink, and lopsided loads caused imbalance of three-hpase voltage. The above factors make the power quality declining, and have seriously influenced the normal production and living of people.In this paper, the author analyzes the reasons and harm of decling of power quality, and produces several methods to promote power quality at present inland and abroad. The author investigated the current situation of power system of Yong chuan, analyzed the power system, measured and calculated its power quality, and finally put forwarded several measures to promote the power quality of Yong chuan’s power system, so that to supervise the layout, construct and management of Yong chuan’s power system, which has theoretical meanings and important factual value.更多还原