有源电力滤波器中交流侧纹波电流的抑制
关键词 纹波电流 LCL输出滤波器 虚拟电阻
毕业论文设计说明书外文摘要
Title Inhibition of ripple current on the AC side in the active filter
Abstract
It is commonly that we use output filter (OF) to suppress AC ripple in Shunt Active Filter 。Because its better performance compared with L, LC output filter，LCL output filter type become a hot research. Currently，we always restrictions to determind the parametersuse when we design LCL output filter ,and within the scope ,we need trial and error until all performance requirements are met. This leads to a large amount of work,and need to be repeated trial and error. To solve the above problem, this paper analyzes the impact of the performance parameters of the output filter ripple rejection of the proposed graphic design. By equation parameters and performance relationship with restrictions，we can plot a map. In the drawing , we can obtain the area of parameters in which requirements to be met, Compromise the performance,we can read out OF parameters directly from the graph which meet the conditions . This article introduces a virtual damper to suppresse resonance peak of LCL filter system, reducing the cost of resistance. Meanwhile, it compensates for the phase which further improves the stability of the system .
Keywords LCL output filter ripple current virtual damper
目 录
1 绪论 1
1.1 背景意义 1
1.2 研究现状 2
1.3 目前研究存在的问题 3
2 APF主电路中常用的输出滤波器 5
2.1 常用输出滤波器拓扑结构 5
2.2 电路的频率响应分析 5
3 基于LCL型输出滤波器的纹波抑制 10
3.1 电路拓扑结构 10
3.2 电路结构的数学分析 11
3.3 LCL输出滤波器的设计 14
4 基于虚拟电阻的LCL型输出滤波器的优化 16
4.1 引入虚拟电阻的输出滤波器结构分析 16
4.2 基于虚拟电阻的LCL型输出滤波器的优化过程 18
5 仿真与结果分析 20
结 论 24
致 谢 25
参考文献26
1 绪论
1.1 背景意义
随着电力电子技术的迅速发展，各种非线性半导体器件得到广泛的应用，谐波对电网的污染日益严重。高次谐波造成的设备故障和事故时有发生。同时由于谐波带来的设备利用率降低、备用容量增加等也给正常的生产造成很大的影响，同时加大了电网的负担，降低了供电质量。谐波成为影响电能质量最主要的因素之一，国内外已经对谐波从电压波形畸变率，谐波电压含量，谐波电流含量等方面制订了详细的标准。我国已有的标准有GB12326-90、GB/T15543-1995和GB/T14549-93等标准[1,2] ，在国际上IEC555-2、IEEE519-1992等标准[3]，这些标准，从各个方面规定了系统正常工作的条件，使系统能够被控制在稳定工作范围内，同时为滤波器的设计提供了性能标准。消除电网中的谐波，净化电能质量成为用户关注的焦点。