摘要:近几年来,电力系统的谐波问题伴随着电力电子技术的快速发展而越来越严重。由于频繁使用谐波负载,产生了大量的谐波。电网谐波注入使得电网电压严重不稳定,谐波成为影响电网不稳定的重要因素。因此,在电力系统的相关领域中,谐波的检测与抑制显得日益重要。82275

本文的核心是基于瞬时无功功率理论的谐波检测方法,主要以瞬时无功功率作为前提，阐述且研究了谐波测量方式：p-q与ip-iq两类。通过分析,说明了在电源畸变即电源电压波形为非理想正弦对称情况下两种方法的差异及原因,并通过仿真软件PSCAD/EMTDC对两种检测法进行了仿真验真,最后通过对比分析,当电网电压畸变时,畸变电压的谐波部分不会出现在ip-iq法的运算,所以测试结果不接受电网电压失真的影响。因此ip-iq运算法的检测结果仍是准确的,而p-q运算法是有误差的。

毕业论文关键词：电力系统谐波；瞬时无功功率理论；p-q检测方法,； ip-iq检测方法

Design of Harmonic Detection Algorithm for Instantaneous Power Theory

ABSTRACT: In recent years, the harmonic problem of power system is becoming more and more serious with the rapid development of power electronic technology。 As a result of frequent use of harmonic load, resulting in a large number of harmonics。 Harmonic injection of the grid makes the grid voltage serious instability, harmonics become an important factor affecting the power grid instability。 Therefore, in the field of power systems, harmonic detection and suppression is increasingly important。

The core of this paper is based on the instantaneous reactive power theory of harmonic detection method, in the instantaneous reactive power theory on the basis of the introduction and analysis of the two harmonic current detection methods p-q and ip-iq。 The differences and causes of the two methods are described in the case of power distortion, that is, the power supply voltage waveform is not ideal sine symmetry。 The simulation results show that the two methods are simulated by simulation software PSCAD / EMTDC。 Finally, When the voltage distortion of the grid, the harmonic part of the distortion voltage does not appear in the ip-iq method of operation, so the test results do not accept the impact of grid voltage distortion。 So the ip-iq algorithm detection results are still accurate, and p-q algorithm is error。

key words： power system harmonics; instantaneous reactive power theory; p-q detection method; ip-iq detection method

目 录

摘要 1

ABSTRACT 2

1。绪论 4

1。1谐波检测的研究背景及意义 4

1。2。1国外研究现状 4

1。2。2国内研究现状 5

1。3本文主要研究的内容 6

2电力谐波理论介绍 7

2。1电力谐波的基本概念 7

2。2电力系统谐波的表达式 7

2。3电力系统谐波的标准 8

2。4电力谐波产生的原因 8

2。5电力谐波的危害 9

2。6本章小结 10

3电力系统谐波的检测 11

3。1谐波检测的几种方法比较 11

3。2基于瞬时无功功率理论的谐波检测 13

3。2。1传统的功率理论