基于DSP的三相高功率因数整流器的研究

发布时间：2018-01-19 04:00

本文关键词： VIENNA整流器三相数字锁相环平均电流模式控制前馈补偿　出处：《广东工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着电力电子装置的发展与广泛应用,电网谐波及无功污染日趋严重。为此,高功率因数和低电流谐波畸变的PWM整流器成为电力电子技术应用中的研究热点。VIENNA整流器由于具有开关电压应力小、开关信号少、可靠性高等特征,在高压、大功率场合有广阔应用前景。但由于VIENNA整流器工作原理复杂、控制难度大,目前尚未成熟。因此,对其电网电压同步控制策略、拓扑控制实现及性能提升的研究具有重要的理论意义及工程价值。首先,本文分析了VIENNA整流器的工作原理,得出其在三相abc坐标系及dq坐标系下的状态空间平均方程,建立了其在不同坐标系下的等效电路模型。其次,采用了三相DPLL计算电流内环参考指令信号的方法。详细分析了PLL各组成部分的工作原理。同时,为了避免二次谐波干扰锁相及缩短程序执行时间,探讨了一种将陷波滤波器串入三相DPLL和使用数字正弦振荡器的改进型DPLL方法。然后,采用了平均电流模式控制策略实现对VIENNA整流器的控制。重点分析了电流内环环路的传递函数,采用了适当的控制器对环路进行了补偿。同时,为了提高功率因数、降低电流谐波畸变率,在电流内环控制中引入了前馈补偿的改进型平均电流模式控制策略。最后,对VIENNA整流器的硬件电路及软件系统进行了设计。详细阐述了VIENNA主电路参数计算及器件选型、控制电路设计、DSP寄存器配置及PID函数。以TMS320F28035为控制核心,构建了一台10kW的VIENNA整流器样机。分别对传统平均电流模式控制策略及改进型平均电流模式控制策略进行了实验测试。实验结果显示,改进型平均电流模式控制策略比传统的平均电流模式控制策略具有更为优越的控制性能。
[Abstract]:With the development and wide application of power electronic devices, harmonic and reactive power pollution are becoming more and more serious. The PWM rectifier with high power factor and low current harmonic distortion has become a research hotspot in power electronics technology. Because of its low switching voltage stress, the VIENNA rectifier has less switching signals. High reliability features, in high-voltage, high-power occasions have a broad application prospects. But because of the complex working principle of VIENNA rectifier, the control is very difficult, so it is not mature at present. The research of voltage synchronization control strategy, topology control and performance improvement is of great theoretical significance and engineering value. Firstly, the working principle of VIENNA rectifier is analyzed, and the average equation of state space in three-phase abc coordinate system and dq coordinate system is obtained. The equivalent circuit model in different coordinate systems is established. Secondly, the method of three-phase DPLL is used to calculate the reference instruction signal of current inner loop. The working principle of each component of PLL is analyzed in detail. At the same time. In order to avoid the second harmonic interference and shorten the execution time of the program, an improved DPLL method by which the notch filter is inserted into the three-phase DPLL and the digital sinusoidal oscillator is used is discussed. Then, the average current mode control strategy is used to control the VIENNA rectifier, and the transfer function of the current inner loop is analyzed. An appropriate controller is used to compensate the loop. At the same time, in order to improve the power factor and reduce the current harmonic distortion rate. An improved average current mode control strategy based on feedforward compensation is introduced in the current inner loop control. Finally, the hardware circuit and software system of VIENNA rectifier are designed. The parameter calculation and device selection of VIENNA main circuit and the design of control circuit are described in detail. DSP register configuration and PID function. Take TMS320F28035 as the control core. A 10kW prototype of VIENNA rectifier is constructed. The traditional average current mode control strategy and the improved average current mode control strategy are tested. The improved average current mode control strategy has better control performance than the traditional average current mode control strategy.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM461

【引证文献】