微电网谐波抑制方法的研究
发布时间：2018-09-08 06:35
【摘要】：微电网以利用多样化、清洁等优点,逐渐成为一种重要的供电方式。提高其在实际应用中的稳定性,特别是要解决高次谐波现象对电能质量造成的影响势在必行。现阶段大部分的负荷都是非线性的,另外电网中含有大量电力电子器件,都是产生谐波的原因。故而,我们要改善用户用电质量抑制电力谐波是十分必要的。本文先通过分析微电网的结构,探讨了如何改善用户用电质量的措施,重点分析谐波产生的来源。为了抑制微电网中的电力谐波,提出了一种LCL型微网逆变器与三相四线制并联型APF相结合的新型方案。首先搭建了 LCL型微网逆变器滤波的模型。随后建立了电容中点型三相四线制有源滤波器的数学模型,分析了谐波检测的一系列方法,确定利用基于静止ABC坐标系下的滞环控制方法及ip-iq谐波检测法。最后,利用Simulink仿真平台建立相应的实验模型,实验结果证明了这种方案可以大大的降低电网中电流的畸变率。同时,本文还验证了动静态响应,当负载变化的时候,该方案依然有很好的抑制效果。
[Abstract]:Microgrid has gradually become an important power supply mode with the advantages of diversification and cleanliness. It is imperative to improve its stability in practical application, especially to solve the influence of high order harmonic phenomenon on power quality. At this stage, most of the loads are nonlinear, in addition, there are a large number of power electronic devices in the power grid, which is the cause of harmonic generation. Therefore, it is necessary for us to improve the quality of power consumption and suppress power harmonics. By analyzing the structure of microgrid, this paper discusses how to improve the quality of consumer power consumption, and analyzes the source of harmonic generation. In order to suppress power harmonics in microgrid, a new scheme of combining LCL microgrid inverter with three-phase four-wire parallel APF is proposed. Firstly, the filter model of LCL microgrid inverter is built. Then the mathematical model of three-phase four-wire active filter with capacitor midpoint type is established and a series of harmonic detection methods are analyzed. The hysteresis control method based on static ABC coordinate system and the ip-iq harmonic detection method are determined. Finally, the corresponding experimental model is established by using the Simulink simulation platform. The experimental results show that this scheme can greatly reduce the distortion rate of the current in the power network. At the same time, the dynamic and static response is verified. When the load changes, the scheme still has a good suppression effect.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM727;TM761
本文编号：2229663
[Abstract]:Microgrid has gradually become an important power supply mode with the advantages of diversification and cleanliness. It is imperative to improve its stability in practical application, especially to solve the influence of high order harmonic phenomenon on power quality. At this stage, most of the loads are nonlinear, in addition, there are a large number of power electronic devices in the power grid, which is the cause of harmonic generation. Therefore, it is necessary for us to improve the quality of power consumption and suppress power harmonics. By analyzing the structure of microgrid, this paper discusses how to improve the quality of consumer power consumption, and analyzes the source of harmonic generation. In order to suppress power harmonics in microgrid, a new scheme of combining LCL microgrid inverter with three-phase four-wire parallel APF is proposed. Firstly, the filter model of LCL microgrid inverter is built. Then the mathematical model of three-phase four-wire active filter with capacitor midpoint type is established and a series of harmonic detection methods are analyzed. The hysteresis control method based on static ABC coordinate system and the ip-iq harmonic detection method are determined. Finally, the corresponding experimental model is established by using the Simulink simulation platform. The experimental results show that this scheme can greatly reduce the distortion rate of the current in the power network. At the same time, the dynamic and static response is verified. When the load changes, the scheme still has a good suppression effect.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM727;TM761
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，本文编号：2229663
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