【作者】 何向东；

【导师】 王杰；

【作者基本信息】 郑州大学 ， 控制理论与控制工程， 2015， 硕士

【摘要】 随着电力系统中非线性负载的大量使用,它给电网所带来的谐波污染问题也日益严重。有源电力滤波器(Active Power Filter,APF)作为一种能够动态抑制谐波的电力电子装置,已经成为抑制谐波和改善电能质量的有效手段,并得到了越来越多的使用和研究。而在高压、大容量以及对补偿精度有较高要求的场合,传统的两电平APF已经达不到要求,此时多电平技术应运而生,尤其是三电平APF受到越来越多青睐。电流跟踪控制是决定APF补偿性能好坏的关键因素之一,提高电流跟踪控制效果对于提高APF的性能具有重要意义。因此,本文在三电平APF的模型基础上进行电流跟踪控制的研究。首先本文在主电路等效模型的基础上详细推导了三电平APF的数学模型,为后续的电流跟踪控制研究提供了数学依据。并且在二极管钳位式变流器的基础上重点讨论了三电平SVPWM(Space Vector Pulse Width Modulation)调制算法的原理及其实现,这种调制算法是三电平APF电流跟踪控制的重要环节。然后介绍了逆系统的基本原理及系统的可逆性判定方法,在这个基础上,将逆系统控制方法引入三电平APF的电流跟踪控制中,实现补偿电流的d、q轴分量线性化解耦控制,并采用常规的PI控制器来构成闭环控制系统。用Matlab/Simulink对三电平APF的逆系统线性化解耦控制进行仿真研究。最后在逆系统线性化解耦的基础上提出采用非奇异终端滑模对三电平APF电流进行跟踪控制。介绍了滑模变结构控制的基本原理,由此引出非奇异终端滑模的基本原理,接着对补偿电流的d、q轴分量分别设计非奇异终端滑模控制器并从理论上证明了其稳定性。给出基于逆系统的非奇异终端滑模电流跟踪控制系统框图,并用Matlab/Simulink对该电流跟踪控制策略进行仿真研究。仿真结果表明本文提出的电流跟踪控制策略具有比较好的稳态性能、动态性能与鲁棒性。更多还原

【Abstract】 With massive use of nonlinear loads in power system, the harmonic pollution in power grid generated by them become more and more serious. The APF(active power filter), as a dynamic harmonic suppression power electronic device, has become an effective means in suppressing harmonic and improving power quality, which drawing more and more use and research attention. The traditional two-level APF has been unable to meet the requirements of high voltage, large capacity and high compensation accuracy, multi-level technology is born at the right moment, especially, the three-level APF has been increasingly popular. Current tracking control is one of the key factors that determine the quality of APF compensation performance, enhancing the effect of current tracking control has very important significance to improve the performance of APF. Therefore, this thesis studies current tracking control based on the model of the three-level APF.Firstly, this thesis deduces the mathematical model of three-level APF in detail based on the equivalent model of main circuit, and this mathematical model provides the basic of subsequent current tracking control research. My work mainly discusses the basic principle and implementation method of the three-level SVPWM(Space Vector Pulse Width Modulation) modulation technology based on the diode clamping type converter, this modulation technology is an important part of the three-level APF’s current tracking control.Then this thesis introduces the fundamental principle of inverse system and the determination method of the system’s reversibility. On this basis, this thesis brings inverse system control method into three-level APF’s current tracking control, which realizes linearized and decoupling control of the d-axis and q-axis compensatory current, and the conventional PI controller is used to constitute a close-loop control system. The Matlab/Simulink is used to simulation research for the three-level APF’s linearized and decoupling control method based on inverse system.Finally, this thesis presents a non-singular terminal sliding mode control method for current tracking control based on the inverse system linearized and decoupling control method. To begin with, this thesis introduces the fundamental principle of sliding mode control and non-singular terminal sliding mode, then designs a non-singular terminal sliding mode controller for the d-axis and q-axis compensatory current respectively and proves the stability of the closed-loop system in theory, also provides current tracking control block diagram using non-singular terminal sliding mode control method based on inverse system, conducts the simulation research for the current tracking control strategy in Matlab/Simulink environment. Simulation results show that the proposed current tracking control strategy has a better steady-state performance, dynamic performance and robustness.更多还原