基于载波相移调制技术的H桥级联APF的研究

发布时间：2018-01-09 13:03

本文关键词：基于载波相移调制技术的H桥级联APF的研究　出处：《合肥工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着现代工业技术的发展,电力系统中非线性负荷大量增加,给电网带来了严重的谐波污染。有源电力滤波器(Active Power Filter, APF)作为一种新型的谐波和无功补偿装置,能够实现动态补偿,改善电能质量。当前国内外对APF的研究主要集中在低压领域,APF应用在中高压领域面临的诸多关键问题有待解决。例如在现有电力电子器件能承受的电压等级不够高的情况下,如何使APF装置承受高电压。另外,电力电子器件开关频率随着APF容量的增大而降低,较低的开关频率又直接影响APF的补偿效果,所以在中高压领域需要解决器件的开关频率与容量之间的矛盾。为了解决APF应用于高压环境中的问题,本文选用H桥级联型拓扑,通过H桥单元的串联,提高APF电压承受能力。结合H桥级联型结构基本工作模式,采用倍频式载波相移调制技术,提高装置等效开关频率。针对APF常规的检测与控制问题。本文采用基于瞬时无功功率理论的ip-iq谐波检测方法,该方法能够快速提取谐波电流,为有源电力滤波器发出补偿电流提供参考目标。为了有效地输出补偿电流,本文采用基于三角载波的直接电流控制方法。为了控制分立的直流侧电容电压的稳定和均衡,文章采用了叠加有功直流分量和有功电压矢量的双层控制方法。文章最后在Simulink环境下搭建H桥级联APF系统仿真模型,对各功能模块及系统整体功能进行仿真实验。通过仿真实验验证了所提调制、检测与控制策略的正确性与有效性。
[Abstract]:With the development of modern industrial technology, the non-linear loads in the power system, brings serious harmonic pollution to power grid. Active power filter (Active Power, Filter, APF) as a new type of harmonic and reactive power compensation device, to achieve dynamic compensation, improve the power quality. The current research of APF at home and abroad mainly concentrated in low pressure areas, many key problems in the domain of APF application in the high voltage and the voltage level remains to be solved. For example can bear in the existing power electronic devices is not high, how to make the APF device under high voltage. In addition, the switching frequency of power electronic devices and reduce with the increase of the capacity of APF, the switching frequency is low has a direct impact on the compensation effect of APF, so it is necessary to solve the contradiction between the switch frequency and the capacity of the device in the high voltage field. In order to solve the application of APF in high pressure environment. In this paper, the H bridge cascaded topology, through the H bridge unit series, improve APF voltage capability. Combined with the basic work of H bridge cascaded structure model, using the double frequency carrier phase shift modulation technology, improve equipment. The equivalent switching frequency for APF detection and control problem. This paper uses the ip-iq method of instantaneous harmonic detection reactive power based on the theory, the method can quickly detect the harmonic current, provide the reference for the target of active power filter compensation current. In order to effectively make the output compensation current, this paper adopts direct current control method based on triangle carrier wave. In order to stabilize and balance the DC capacitor voltage control division, the double control method of superposition the active DC component and active voltage vector. Finally, in the Simulink environment to build the cascade APF system simulation model of H bridge, the function of each module and system Simulation experiments are carried out to verify the correctness and effectiveness of the proposed modulation, detection and control strategy.

【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM761;TN713.8

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