串联型有源电力滤波器在微电网中的应用研究

发布时间：2018-11-07 19:55

【摘要】：随着全球经济的发展及电能需求的增加，大电网暴露的问题日益增多，微电网技术作为电网发展的新方向成为近年来研究热点之一。微源并网采用的逆变器及微电网中存在的其他电力电子装置，会给微电网带来大量的谐波污染。而风力发电与光伏发电具有很强的随机性，使微电网电能质量特别是谐波问题进一步恶化。由于谐波问题在微电网中的广泛存在，为了保证微电网的稳定、安全、经济运行，本文对微电网的谐波抑制问题，进行了相关研究。本文对微电网的基本结构进行了详细研究，根据微电网的系统阻抗特征，建立了PV/Qf的下垂控制模型，在微电网控制模型的基础上，，对微电网产生谐波的机理进行的分析。根据低压微电网中阻性线路阻抗及本地非线性阻容负载产生的谐波电压问题，本文详细地介绍了串联型有源滤波器，并设计了基于瞬时无功功率理论的ip-iq的改进方法提取谐波。通过建立串联型有源滤波器的等效模型，分析传统负载谐波电压检测法的不足，采用了电源谐波电流和负载谐波电压综合检测法。对谐波跟踪方法进行了分析介绍，采用准比例谐振控制器跟踪谐波电压。本文在MATLAB/Simulink软件环境下建立了非线性负载情况下的微电网仿真模型，串联型有源滤波器可以有效地改善公共点处的电能质量，验证了理论的有效性与合理性。搭建了三台逆变器的微电网谐波实验平台，其中一台作为串联型有源滤波器。在实验平台的基础上，进行了微电网下垂控制及串联型有源电力滤波器补偿谐波两方面的实验。结果表明，微电网中串联型有源滤波器改善谐波问题的有效性。
[Abstract]:With the development of global economy and the increase of power demand, the problems exposed to large power grids are increasing day by day. As a new direction of power grid development, microgrid technology has become one of the research hotspots in recent years. The inverter and other power electronic devices used in the microgrid will bring a lot of harmonic pollution to the microgrid. Wind power generation and photovoltaic generation have strong randomness, which makes the power quality of micro-grid, especially harmonic problem, worse. In order to ensure the stability, safety and economic operation of micro-grid, the harmonic suppression problem of micro-grid is studied in this paper. In this paper, the basic structure of microgrid is studied in detail. According to the impedance characteristics of microgrid, the droop control model of PV/Qf is established. Based on the control model of microgrid, the mechanism of harmonic generation in microgrid is analyzed. According to the harmonic voltage problem caused by impedance of resistive line and local nonlinear resistive load in low voltage microgrid, the series active power filter is introduced in detail in this paper. An improved method of ip-iq based on instantaneous reactive power theory is designed to extract harmonics. By establishing the equivalent model of series active power filter and analyzing the deficiency of traditional load harmonic voltage detection method, the comprehensive detection method of power harmonic current and load harmonic voltage is adopted. The harmonic tracking method is analyzed and introduced, and the harmonic voltage is tracked by the quasi-proportional resonance controller. In this paper, the simulation model of microgrid under nonlinear load is established in the environment of MATLAB/Simulink software. The series active power filter can effectively improve the power quality of common points, and verify the validity and rationality of the theory. The harmonic experiment platform of three inverters is built, one of which is used as series active power filter. On the basis of the experimental platform, the experiments of microgrid droop control and series active power filter harmonic compensation are carried out. The results show that the series active filter in microgrid is effective to improve the harmonic problem.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761;TN713.8

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