基于逆系统的三电平有源电力滤波器电流跟踪控制研究

发布时间：2018-03-10 12:11

本文选题：三电平有源电力滤波器　切入点：电流跟踪控制　出处：《郑州大学》2015年硕士论文　论文类型：学位论文

【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。
[Abstract]:With the large use of nonlinear load in power system, the harmonic pollution problem is becoming more and more serious. Active Power filter (APF) is a kind of power electronic device which can dynamically suppress harmonics. It has become an effective means to suppress harmonics and improve power quality, and has been used and studied more and more. But in the case of high voltage, large capacity and high compensation precision, the traditional two-level APF can not meet the requirements. The multilevel technology emerges as the times require, especially the three-level APF is more and more popular. Current tracking control is one of the key factors to determine the compensation performance of APF. It is very important to improve the performance of APF by improving the effect of current tracking control. In this paper, the current tracking control is studied on the basis of the three-level APF model. Firstly, the mathematical model of three-level APF is derived based on the equivalent model of the main circuit. This paper provides a mathematical basis for the following research on current tracking control. Based on diode clamped converter, the principle and implementation of three-level SVPWM(Space Vector Pulse Width modulation algorithm are discussed. This modulation algorithm is an important part of three-level APF current tracking control. Then the basic principle of inverse system and the determination method of system reversibility are introduced. The inverse system control method is introduced into the three-level APF current tracking control to realize the linearized decoupling control of the dq-axis component of the compensating current. The conventional Pi controller is used to construct the closed-loop control system. The linearization decoupling control of the three-level APF inverse system is simulated by Matlab/Simulink. Finally, the nonsingular terminal slippage is proposed based on the linearization decoupling of the inverse system. The principle of sliding mode variable structure control is introduced. The basic principle of nonsingular terminal sliding mode is derived. Then the nonsingular terminal sliding mode controller is designed for the dq-axis component of the compensating current and its stability is proved theoretically. The block diagram of the non-singular terminal sliding mode current tracking control system based on the inverse system is given. The simulation results show that the proposed current tracking control strategy has good steady-state performance, dynamic performance and robustness.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713;TM761

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