三相UPS逆变器数字控制及并联研究

发布时间：2018-04-01 13:04

本文选题：三相UPS逆变器　切入点：谐波分析　出处：《哈尔滨理工大学》2017年硕士论文

【摘要】：随着经济的不断发展,各行各业对电能质量要求在不断提升,由于不同类型用电设备的增加,市电质量变差并且满足不了高端用户的要求,不间断电源(Uninterruptible Power Supply,UPS)逐渐成为这些特殊用户的首要选择,对于UPS而言采取高效率和高可靠性是保证供电安全的关键所在,所以UPS逆变控制技术必须不断发展以满足人们对高质量电源的需求。本文研究对象为三相UPS逆变器,首先介绍了UPS的现状及发展趋势,分析了常见的逆变器控制策略及逆变器并联的结构和控制方式并分析了各自的优缺点。其次,分别在三相静止、两相静止及两相旋转标系下建立三相逆变器的模型,通过对逆变器模型的解耦设计了逆变器电压电流双闭环PI控制器,在此基础上为了满足逆变器并联需求,加入下垂控制以实现逆变器的无信号连线的并联运行,利用动态向量法对下垂控制的并联系统进行小信号建模,分析了下垂系数对系统稳定性的影响,并给出优化设计方法,利用MATLAB进行了仿真,又对逆变器并联运行时的均流状态进行了分析。虽然空间矢量调制方式(Space Vector Pulse Width Modulation,SVPWM)在逆变器的控制上相比于传统的方法有着谐波畸变率小的特点,但对于脉宽调制控制的电压型逆变器,其输出不可避免的会含有大量的谐波,本文通过数学推导及仿真分析影响输出电压谐波的因素,包括调制电压,调制频率以及死区效应的影响,并提出死区补偿的方案。最后,在理论分析的基础上,进行了硬件实验,设计了硬件电路及软件控制部分,硬件部分包括电压电流采样电路,保护电路,驱动电路等,软件设计基于TI的SYS/BIOS实时操作系统,利用TMS320F28335高性能浮点型DSP芯片实现了基于空间矢量调制方式的逆变器的控制。
[Abstract]:With the development of economy, the requirements of power quality in all kinds of industries are increasing. Because of the increase of different types of power equipment, the quality of electricity becomes worse and can not meet the requirements of high-end users. Uninterruptible Power supply (ups) has gradually become the first choice for these special users. For UPS, high efficiency and high reliability is the key to ensure the security of power supply. Therefore, UPS inverter control technology must be continuously developed to meet the needs of high quality power supply. In this paper, three-phase UPS inverter is studied. Firstly, the status quo and development trend of UPS are introduced. The common inverter control strategies, the structure and control mode of parallel inverter are analyzed, and their advantages and disadvantages are analyzed. Secondly, the models of three-phase inverter are established under three-phase static, two-phase static and two-phase rotating scale respectively. A voltage and current double closed loop Pi controller is designed by decoupling the inverter model. In order to meet the parallel requirements of the inverter, the droop control is added to realize the parallel operation of the inverter without signal connection. The dynamic vector method is used to model the droop control parallel system with small signal. The influence of sag coefficient on the stability of the system is analyzed, and the optimal design method is given. The simulation is carried out by MATLAB. The current sharing state of the inverter in parallel operation is also analyzed. Although space Vector Pulse Width modulation (SVPWM) has the characteristics of less harmonic distortion than the traditional method in the control of the inverter. However, for the voltage source inverter controlled by pulse width modulation, the output will inevitably contain a lot of harmonics. This paper analyzes the factors affecting the output voltage harmonics, including the modulation voltage, by mathematical derivation and simulation. The effect of modulation frequency and dead-time effect is proposed. Finally, on the basis of theoretical analysis, the hardware experiment is carried out, and the hardware circuit and software control part are designed. The hardware part includes voltage and current sampling circuit. Protection circuit, drive circuit and so on, software design based on TI SYS/BIOS real-time operating system, using TMS320F28335 high performance floating-point DSP chip to realize the inverter control based on space vector modulation.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM464;TN86

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