基于滑模变结构三相PWM整流器内模控制

发布时间：2018-07-06 16:28

本文选题：PWM整流器 + 内模控制　；参考：《湘潭大学》2014年硕士论文

【摘要】：近年来，电力电子与电力变换行业大力提倡电能“绿色变换”，传统的整流电路给电网带来大量谐波和无功污染，不符合行业发展方向。三相PWM整流器具有输入正弦化、网侧电流低谐波、实现单位功率因数运行、能量可双向流动、和直流电压可控等优点，可从根本上解决整流所带来的谐波和无功污染问题。因此，在工业应用领域得到了极为广泛的应用。本文对三相PWM整流器进行了研究，主要内容如下：一、对三相PWM整流器系统的拓扑结构进行分析，建立了其在三种常用坐标系下的数学模型。为了消除两相旋转dq坐标系下dq轴的耦合项ω L，分析了采用PI调节器电流前馈解耦控制过程。鉴于电流前馈解耦PI参数整定的复杂过程，本文将内模控制运用于系统解耦，该方法设计过程简单，参数调试方便，解耦过程不依赖精确系统参数和模型参数。在Matlab中对PI调节电流前馈解耦与内模解耦进行了仿真比较，结果表明了内模调节器的设计不仅对PWM整流器参数的依赖性较小，容易调整，并且具有优良的电流内环动态响应性能。二、为了改善电压外环，本文将滑模变结构理论运用于控制系统的电压外环设计。提出了一种基于滑模变结构三相PWM整流器内模控制策略，滑模电压外环，跟踪直流输出指令电压并输出内环指令电流，内模控制电流内环，跟踪指令电流并使网侧电压电流正弦化。最后，通过构建电流内环和电压外环的控制框图，搭建了基于MATLAB/simulink仿真实验平台的三相PWM整流器系统的仿真模型，仿真结果表明，，系统具有响应速度快、跟踪精度高、抗干扰能力强等特点。三、根据所提出滑模变结构三相PWM整流器内模控制原理，搭建了10kW单个PWM整流器模块实验平台，设计了三相PWM整流器系统硬件和软件，其中控制系统硬件包括采样电路、驱动及保护电路、软启动电流、过零锁相电路等；控制系统软件采用TI公司的DSPTMS320F2812作为主控芯片，包括主程序，控制策略子程序、SVPWM子程序及其他各种中断服务程序等。实验结果也验证了混合非线性控制的有效性。
[Abstract]:In recent years, power electronics and power transformation industry strongly advocate "green transformation" of power, traditional rectifier circuit brings a lot of harmonic and reactive power pollution to the power network, which is not in line with the development direction of the industry. The three-phase PWM rectifier has the advantages of sinusoidal input, low current harmonics on the grid side, unit power factor operation, bidirectional energy flow, and DC voltage controllable, which can fundamentally solve the problems of harmonic and reactive power pollution caused by rectifier. Therefore, it has been widely used in the field of industrial application. The main contents of this paper are as follows: firstly, the topology of the three-phase PWM rectifier system is analyzed and its mathematical model in three common coordinate systems is established. In order to eliminate the coupling term 蠅 L of DQ axis in two-phase rotating DQ coordinate system, the current feedforward decoupling control process using Pi regulator is analyzed. In view of the complex process of current feedforward decoupling Pi parameter tuning, the internal model control is applied to decoupling the system. The design process is simple, the parameter debugging is convenient, and the decoupling process does not depend on the precise system parameters and model parameters. The simulation results of Pi current feedforward decoupling and internal mode decoupling in Matlab show that the design of internal mode regulator is not only less dependent on the parameters of PWM rectifier, but also easy to adjust. And it has excellent dynamic response performance of current inner loop. Secondly, in order to improve the voltage outer loop, the sliding mode variable structure theory is applied to the voltage outer loop design of the control system. An internal mode control strategy based on sliding mode variable structure three-phase PWM rectifier is proposed. The sliding mode voltage outer loop tracks the DC output instruction voltage and outputs the inner loop instruction current, and the internal mode control current inner loop. Track the command current and sine the voltage and current on the grid side. Finally, by constructing the control block diagram of current inner loop and voltage outer loop, the simulation model of three-phase PWM rectifier system based on MATLAB / Simulink simulation platform is built. The simulation results show that the system has fast response speed and high tracking accuracy. Strong anti-interference ability and other characteristics. Thirdly, according to the internal mode control principle of sliding mode variable structure three-phase PWM rectifier, an experimental platform of 10kW single PWM rectifier module is built, and the hardware and software of three-phase PWM rectifier system are designed. The control system hardware includes sampling circuit. Driver and protection circuit, soft-start current, zero-crossing phase-locked circuit, etc. The control system software uses DSP TMS320F2812 of TI Company as main control chip, including main program, control strategy subroutine, SVPWM subroutine and other interrupt service programs. Experimental results also verify the effectiveness of hybrid nonlinear control.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM461

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