摘要随着国民经济的发展和人民生活水平的不断提高，企业和居民对电能的需求量日益增加，对电能质量的要求也日益提高。及时准确分析电能质量参数，对于电气设备安全生产、增强国民经济的总体效益、保障居民生活水平有着重要的意义。由于电能参数的时变特性和分布特性，必须对电能分布网络上的多点电能参数进行实时监测和分析，才能得到电能质量参数，进而找出导致电能质量恶化的可能原因，为相关部门采取有效措施提供决策依据，提高总体电能质量。66226

本文首先介绍了电能质量的定义，并根据电力系统的运行状态和电能质量扰动现象的特点，将电能质量分为稳态和暂态两种，其中稳态电能质量有电压偏差、频率偏差、三相不平衡度、谐波以及电压波动。对各项电能质量问题产生的原因、危害以及国家标准做了详细的分析说明，并在此基础上设计电能质量监测系统。选用LabVIEW软件开发平台对仿真数据进行分析，结果证实了本文提出的电能质量综合评估方法是正确可行的。

毕业论文关键词：电能质量，虚拟仪器，LabVIEW

A power quality analyzer for Intelligent Substation based on NI CRIO platform

Abstract

The development of national economy and the continuous rising of the people’s living standard is proposing more demands on electric power as well as higher requirements on power quality（PQ）. Real-time accurate power quality measurement is essential to electrical equipment safe operation parameters are time-varying and distributed, it is necessary to measure the power parameters instantaneity at different positions on the power transmission line. Only in the way, can we get the PQ’s parameters, which is a clue to find the source of power harmonics and assist relevant authorities to improve the power quality.

First of all, introduces the definitions of power quality, and according to the characteristics of power quality and the operating status of power system, power quality is pided into two kinds of steady-state and transient. The steady-state quality includes voltage deviation, power frequency deviation, three-phase unbalance, voltage fluctuation and harmonics. The cause, hazards and national standards of power quality problem have made a derailed analysis, and as the basis for the design of on-line power quality monitoring system. According to analysis of some measured substation data with LabVIEW, the results conform the integrated assessment is correct and feasible.

Keywords  Power Quality, Virtual Instrument, LabVIEW

目次

1 绪论 1

1.1 电能质量问题的研究背景和现状 1

1.2 研究电能质量的目的与意义 2

1.3 电能质量的分类和标准 2

1.4 本论文主要的内容 3

2 智能变电站 4

2.1 智能变电站的介绍 4

2.2 智能变电站与传统变电站二次回路的区别 4

2.3 关于IEC61850 SV的介绍 5

3 电能质量指标分析 7

3.1 电能质量的概念和分类 7

3.2 电能质量指标分析 7

3.2.1 电力系统供电电压偏差 7

3.2.2 电力系统允许频率偏差 9

3.2.3 三相允许不平衡度 11