基于PWM技术的微电网谐波抑制的研究

发布时间：2018-05-14 18:43

本文选题：微电网 + 有源滤波器　；参考：《宁夏大学》2017年硕士论文

【摘要】：由于电力电子变换器、分布式电源和非线性负载的广泛应用,在分布式发电中会影响电能的质量,尤其是产生谐波问题越来越严重,无论是在理论中还是在实践中,对微电网中产生的谐波进一步深入研究意义深远。文中论述了微电网的基本构造,并对各主要组成部分产生的谐波进行研究分析;对微电网中三个主要分布式电源的工作原理及数学模型进行研究分析,其中分布式电源包括:光伏发电系统、直驱式永磁同步发电机组成的风力发电系统、蓄电池,通过MATLAB/SIMULINK软件平台对基于PWM技术的分布式电源进行了建模与仿真,并构建了微电网仿真模型。基于微电网中产生的谐波对电能的影响,本文研究了一种基于PWM电流控制的并联型有源滤波器与单调谐相结合的方法来治理微电网中产生的谐波。通过对有源滤波器和单调谐滤波器的原理和结构分析研究,并借助MATLAB/SIMULINK对其进行了模型搭建与仿真分析,仿真模型中通过对几种谐波检测方式进行比较,最终选择基于瞬时无功功率理论ip-iq方法和基于PWM电流跟踪滞环控制方法进行谐波治理。通过系统仿真,验证采用基于PWM电流控制的并联型有源滤波器和单调谐方法相结合的方法对微电网中产生的谐波进行谐波抑制效果显著。
[Abstract]:Due to the wide application of power electronic converters, distributed power sources and nonlinear loads, the quality of electrical energy will be affected in distributed generation, especially the problem of harmonic generation is becoming more and more serious, both in theory and in practice. It is of great significance to further study the harmonic generation in microgrid. In this paper, the basic structure of microgrid is discussed, and the harmonic generated by each main component is studied and analyzed, and the working principle and mathematical model of three main distributed generators in microgrid are studied and analyzed. The distributed power supply includes: photovoltaic power generation system, wind power system composed of direct-drive permanent magnet synchronous generator, storage battery, modeling and simulation of distributed power generation based on PWM technology through MATLAB/SIMULINK software platform. The simulation model of microgrid is constructed. Based on the influence of harmonic generated in microgrid on electric energy, this paper studies a method of combining shunt active power filter with single tuning based on PWM current control to treat harmonic generated in microgrid. By analyzing the principle and structure of active power filter and single tuned filter, the model of active filter and single tuned filter is built and simulated by MATLAB/SIMULINK. In the simulation model, several harmonic detection methods are compared. Finally, harmonic control based on instantaneous reactive power theory ip-iq method and PWM current tracking hysteresis control method is selected. Through system simulation, it is verified that the method of combining shunt active power filter based on PWM current control and single tuning method has remarkable effect on harmonic suppression of harmonic generated in microgrid.
【学位授予单位】：宁夏大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM727

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