基于谐波状态估计的谐波源辨识方法研究

发布时间：2018-03-09 17:38

本文选题：谐波污染　切入点：谐波状态估计　出处：《济南大学》2015年硕士论文　论文类型：学位论文

【摘要】：电能质量对于全社会具有非常重要的意义,抑制谐波,保证电能质量越来越重要。谐波不仅影响电网的供电质量,还对用户的安全构成威胁,所以辨别谐波源成为比较重要的问题。要进行谐波状态估计计算,如何对其进行建模计算是关键。本文首先介绍电力系统的相关基础知识,了解电网的组成,解释了电网中谐波状态方程的建立过程,利用相量量测,得到测量数据并根据误差进行数据进行筛选。在已知网络结构参数以及线路拓扑结构的条件下,以谐波电流为状态量,谐波电压为量测量列相关节点的电压方程、注入电流方程,并优化算法进行求解。根据负载节点是否可疑,可疑节点是否被量测,舍去不用考虑的状态量,并用已知的量测量和电网参数表示,简化方程。然后将相量方程化为实部和虚部两组方程,加快运算速度,最后求出谐波估计值。并用IEEE-14网络进行计算仿真。根据谐波状态估计的估计值对负载进行谐波源辨识,文中研究常用的几种辨识谐波源的方法,如谐波功率方向法、辨识负荷参数法。分析了注入谐波有功和注入谐波无功的优缺点,在此基础上本文结合非线性负载阻抗虚部与注入谐波有功功率、无功功率的符号关系改进了基于谐波状态估计的谐波源辨识法,相比谐波有功功率方向的辨识法,准确性有所提高且计算简便。辨识得到谐波源之后,就需要考虑划分用户侧与电网侧的污染责任的问题,文章后一部分简要介绍了划分谐波责任指标的改进过程,从单个谐波源情况拓展到多个谐波源情况,并对不同连接情况的电路进行仿真计算,最后结合计算实例对划分谐波的污染责任指标给出了基本要求。
[Abstract]:Power quality has a very important significance for the whole society to suppress the harmonic and guarantee the power quality becomes more and more important. The harmonic not only affects the quality of power supply, but also pose a threat to safety of users, so identifying harmonic sources become relatively important. To carry out harmonic state estimation, how to carry on the modeling calculation is the key this paper firstly introduces basic knowledge of power system, understand the grid composition, explains the process of establishing the state equation of harmonic in power system, the use of phasor measurement, and the data were screened according to the measured data. The error in the known network structure parameters and circuit topology conditions, the harmonic current as state variables, harmonic voltage measurement for the voltage equation of column related nodes, injection current equations, and solved optimization algorithm. According to the load node is suspicious, suspicious node is The measurement, without truncation of state variables are considered, and the measurement and the grid parameters known that simplified equation. Then the phasor equation into real and imaginary parts of the two equations, accelerate the speed of operation, and finally calculate the harmonic estimation value. And simulation with the IEEE-14 network. The harmonic source identification of load according to the estimation of harmonic state estimation value, study some methods commonly used in the identification of harmonic sources, such as harmonic power direction method, parameter identification of load method. Analyze the advantages and disadvantages of reactive power and harmonic active harmonic injection injection, on the basis of the combination of nonlinear load and imaginary impedance and injected harmonic active power, symbolic relations the reactive power of the improved harmonic source identification method based on harmonic state estimation, identification method compared with the harmonic active power direction, the accuracy is improved and the calculation is simple. After the identification of harmonic source, you need to test The problem about pollution liability division of user side and grid side, this part briefly introduces the improvement process of dividing the harmonic responsibility index, expanding from a single harmonic source to multiple harmonic sources, and the different circuit connection was calculated, finally gives the harmonic pollution to the division of responsibility index calculation the basic requirements.

【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM711

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