VIENNA拓扑整流器的控制技术研究

发布时间：2018-02-04 06:45

本文关键词： LCL滤波三相VIENNA拓扑整流器数字延时有源阻尼占空比前馈控制 SVPWM调制相位补偿 burst-mode控制　出处：《浙江大学》2014年硕士论文　论文类型：学位论文

【摘要】：三相VIENNA拓扑整流器是一种三电平电路,功率器件承受的电压低,功率因数校正效果好。该拓扑开关管之间不存在死区时间,可以工作于高开关频率下。因此,三相VIENNA拓扑整流器前端无源滤波元件小,功率密度高,目前得到了广泛的应用。本文首先对三相VIENNA拓扑整流器进行建模分析。该拓扑根据输入的连接方式可以分为三相四线制和三相三线制拓扑。前者输入中线和输出电容中点相连,三相电路可以单独控制；后者三相耦合,控制上较为灵活。本文基于三相四线制VIENNA拓扑整流器,前端引入LCL滤波器来进一步提高其功率密度。针对LCL滤波器的特点,修正传统的占空比前馈补偿算法。同时,针对不同的电流反馈位置下,控制系统数字延时对系统稳定性的影响进行分析研究。提出利用数字延时,合理设计LCL参数使系统稳定的方案。其次,本文从奈奎斯特稳定性原理出发,提出了一种基于网侧电流反馈补偿的新型有源阻尼方法,其不需要额外增加传感器,同时控制简单。通过分析系统有源阻尼的各种可能途径,据此提出了两种电流补偿函数使系统稳定工作。基于三相三线制VIENNA拓扑整流器,本文分析研究空间矢量调制模式,给出各个矢量的合成和作用时间。同时基于输入电流换扇区尖刺的问题,提出利用相位补偿控制,减小采样锁相误差造成的换向载波比较的逻辑错误。最后,针对VIENNA拓扑能量单相流动的特点,研究了其在轻载和空载下的工作特点,提出利用burst-mode控制算法保证输出电压稳定。本文对提出的算法和控制方案进行了仿真和实验。仿真基于MATLAB的S-Function模块。基于该模块可以利用C语言编程的特点,模拟实际数字控制系统,减小仿真误差。最后,本文通过DSP控制实验,对各个算法进行一一的验证和实现。
[Abstract]:The three-phase VIENNA topology rectifier is a three-level circuit with low voltage and good power factor correction effect. There is no dead time between the topology switches. It can work at high switching frequency. Therefore, the three-phase VIENNA topology rectifier front-end passive filter components are small, high power density, has been widely used. The topology of three-phase VIENNA rectifier can be divided into three-phase four-wire topology and three-phase three-wire topology according to the connection mode of input. The former has input midline and output capacitance midpoint phase. Company. The three-phase circuit can be controlled separately. Based on three-phase four-wire VIENNA topology rectifier, the front-end introduces LCL filter to further improve its power density. According to the characteristics of LCL filter. The traditional duty cycle feedforward compensation algorithm is modified. At the same time, the influence of digital delay on the stability of the control system is analyzed and studied under different current feedback positions, and the use of digital delay is proposed. Reasonable design of LCL parameters to make the system stable. Secondly, based on Nyquist stability principle, a novel active damping method based on network-side current feedback compensation is proposed. It does not need additional sensors, while the control is simple. By analyzing the various possible ways of active damping of the system. Based on the three-phase three-wire VIENNA topology rectifier, this paper analyzes and studies the space vector modulation mode. At the same time, the phase compensation control is used to reduce the logic error of commutative carrier comparison caused by the sampling phase lock error. According to the characteristics of single phase flow of VIENNA topology energy, the working characteristics of VIENNA under light load and no load are studied, and the burst-mode control algorithm is proposed to ensure the output voltage stability. In this paper, the proposed algorithm and control scheme is simulated and experimented. The S-Function module based on MATLAB is simulated. Based on this module, C language can be used to program. The simulation error is reduced by simulating the actual digital control system. Finally, through the DSP control experiment, each algorithm is verified and implemented one by one.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM461

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