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摘要本文的研究对象是三相三线制并联型有源滤波器。 首先介绍了三相三线制并联电压型有源电力滤波器的基本结构和工作原理，建立了在 abc 静止坐标系，dq0 旋转坐标系下的数学模型，为控制器的设计奠定理论基础。本文重点对有源滤波器双闭环控制系统的控制策略进行深入分析和比较。 控制策略由控制器的设计和调制方法的设计构成。在控制器上，对于电流内环，本文分别设计了 PI控制器，比例重复控制器，比例谐振控制器，从它们的传递函数入手，分析了各自的稳定性，跟踪参考指令的特性等，并给出了各个控制器离散化实现的差分方程；对于电压外环，PI控制器就能较好控制；在调制策略上，比较了三角波调制策略，SVPWM调制策略。文章最后通过 PSIM 仿真，对仿真波形进行对比分析，验证了各个控制策略的性能。本文还引进电压前馈和电流解耦，优化了控制器的性能。同时，有源滤波器主电路交流侧使用 LCL滤波器，大大提高了补偿效果。32286
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毕业论文关键词 并联型有源滤波器 PI 控制 比例重复控制器 比例谐振控制 离散化差分方程 LCL滤波器
Title the control strategy of shunt active power filter
Abstract With the development of modern industrial technology, non-linear loads in powersystem have increased,resulting in the the increase of harmonic in the system.Active power filter is one of the most effective ways to compensate harmonicpollution.It can not only suppress harmonics,but also compensate the reactivepower.This article mainly discusses three phase three wire shunt active power filter.First, the basic structure and working principle of the three phase three linesystem shunt active power filter is briefly introduced and the mathematicalmodel of this active power filter is established in the static coordinate systemand the rotating coordinate system.This article focuses on the control strategy of double closed-loop control systemcontrol strategy.First,through the control block diagram of the controlled object,the difference of the voltage loop and current loop is discussed.The performanceof PI controller,the controller proportional and repetitive controller,PRcontroller is analyzed and compared.As for the modulation strategy ,the triangularwave strategy and SVPWM is discussed.Finally the simulation confirmation of APFbased on the control strategies above is done.The performance of various controlstrategies is verified.The design of the current and voltage feedback optimize the performance of thecontroller.At the same time,the use of LCL filter greatly improve the compensationeffect.The comparison of LCL filter and L filter is done through the simulation.
Keywords SAPF PI controller Proportional plus repetitive controllerProportional resonant controller Differential Equations LCL filter
目次
1绪论.1
1.1课题背景和意义.1
1.2三相三线制并联型有源滤波器的研究现状.1
1.3本文主要的研究内容.5
2三相三线制有源滤波器的基本原理和数学模型.6
2.1基本原理.6
2.2并联型有源滤波器的数学模型.6
2.3本章小结.10
3并联型有源滤波器的控制策略.11
3.1电流内环控制.11
3.2电压外环闭环控制.22
3.3电网电压前馈和电流解耦的控制.23
3.4有源滤波器的调制技术.25
3.5本章小结.32
4主电路参数的选取.33
4.1开关频率的选择.33
4.2直流侧电压的选取.33
4.3直流侧电容的选择.33
4.4LCL滤波器的设计.34
4.5本章小结.37
5有源滤波器仿真电路和结果分析.38
5.1系统仿真电路以及参数.38
5.2未加控制时负载波形分析.39
5.3电网电压有无前馈对比仿真.39
5.4LCL滤波器与L型滤波器的对比仿真40
5.5PI控制仿真.42
5.6比例谐振控制法.46