谐波源定量估计方法研究

发布时间：2018-05-18 08:15

本文选题：电能质量 + 谐波污染　；参考：《中国矿业大学》2014年硕士论文

【摘要】：随着电力技术的飞速发展，种类繁多的电力电子设备被运用到电力系统中，这其中有大量是非线性器件，带来了电能质量问题。谐波是电能质量的一项重要指标，其带来的安全、经济方面的危害也受到人们的广泛关注。找出谐波污染源，明确治理地点，合理划分责任对整个电力系统有着重要意义。客观划分谐波污染责任的前提是对谐波源污染水平进行正确的估计。谐波责任划分技术表现的是供电部门及用户对谐波污染的共同责任。近些年也有很多谐波责任划分方法被国内外学者所提出。这些方法大致分为两类，一种是定性辨识，还有一种是定量估计。早期的技术主要是谐波源定性辨识，其只能判断出电源侧和用户侧哪一测是主要谐波源，不能明确具体污染水平。而后期的谐波源定量估计，则主要是通过计算谐波阻抗，算出各谐波源具体的污染水平。谐波责任划分技术的两大类都包含多种方法，本文对其中一些方法进行了研究和分析，指出其合理性及不足，也通过仿真进行了部分理论的验证。在研究分析现有国内外谐波责任划分技术后，本文提出了基于特征根估计的谐波源污染水平计算方法，该方法属于定量估计，可以估计出各谐波源具体的污染水平。其基本思路是：将整个电网系统分为电源侧和用户侧，两侧分别以戴维南、诺顿等效电路表示，根据电路理论构建回归模型。通过对监测点即公共连接点进行测量，，得出谐波电压、电流信号，运用特征根估计计算回归系数，得出谐波阻抗进而估计出具体的谐波污染水平。在本文最后，通过MATLAB软件搭建模型进行了实验仿真，通过和其他方法计算结果的对比说明，采用特征根估计进行谐波源污染水平计算有一定的优越性。
[Abstract]:With the rapid development of power technology, a wide variety of power electronic devices have been applied to power systems, among which a large number of nonlinear devices have brought about power quality problems. Harmonic is an important index of power quality, and its safety and economic harm are paid more and more attention. It is important for the whole power system to find out the harmonic pollution source, clear the treatment location and reasonably divide the responsibility. The premise of objectively dividing the responsibility of harmonic pollution is to estimate the pollution level of harmonic source correctly. Harmonic responsibility division technology is the common responsibility of power supply departments and users to harmonic pollution. In recent years, there are a lot of harmonic responsibility division methods proposed by domestic and foreign scholars. These methods can be divided into two categories, one is qualitative identification and the other is quantitative estimation. The early technology is mainly qualitative identification of harmonic sources, which can only determine which measurement is the main harmonic source on the power side and the user side, and can not determine the specific pollution level. However, the quantitative estimation of harmonic source in the later stage is mainly based on the calculation of harmonic impedance and the specific pollution level of each harmonic source. There are many methods in the two categories of harmonic responsibility division technology. This paper studies and analyzes some of them, points out their rationality and deficiency, and verifies some theories by simulation. After studying and analyzing the existing domestic and foreign harmonic responsibility division techniques, this paper presents a method for calculating the pollution level of harmonic sources based on eigenvalue estimation, which belongs to quantitative estimation and can be used to estimate the specific pollution levels of each harmonic source. The basic idea is to divide the whole power system into the power side and the user side. The two sides are represented by Davinan and Norton equivalent circuits respectively and the regression model is constructed according to the circuit theory. The harmonic voltage and current signals are obtained by measuring the monitoring points, and the regression coefficients are calculated by using the characteristic root estimation, and the harmonic impedance is obtained and the specific harmonic pollution level is estimated. At the end of this paper, the model is built by MATLAB software and the results are compared with other methods. It is proved that the characteristic root estimation has some advantages in the calculation of harmonic source pollution level.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM711

【参考文献】