电除尘用高频高压脉冲电源的研究

发布时间：2018-08-01 14:11

【摘要】：电除尘器是一种高效、节能、运维简单并且广泛应用于火电、水泥、冶金、化工等行业的环保除尘设备,对于减少粉尘的排放具有重要作用。电除尘器工作时必须有高压电源对其供电,采用不同的供电电源,其产生的除尘效果往往大相径庭。采用高压脉冲电源供电不仅能有效改善采用传统高压直流电源供电时出现的电晕电压低和反电晕现象、提高除尘效率而且能降低电除尘器的能耗。因此,研究和设计电除尘用的高频高压脉冲电源具有极其重要的意义。本文首先介绍了电除尘用高频高压脉冲电源系统的结构,然后分析比较几种常用的功率变换电路,并从中选择移相全桥ZVS软开关电路作为电源主电路结构；详细分析并设计移相全桥ZVS软开关电路的相关参数,然后还分析比较了几种常用的脉冲形成电路,并介绍了多模块脉冲叠加技术和同步驱动技术,以此设计了高压脉冲形成电路。高频变压器是电源的重要组成部分之一,本文详细介绍了数种磁芯材料并确定磁芯型号及参数,同时给出变压器的设计步骤并确定变压器的参数,最后还进行了变压器的绝缘设计并确定绕制方式。基于DSP的控制系统实现了电源的数字化控制以及实时显示输出的功能。文中设计了基于TMS320LF2407的电源控制部分的硬件电路和软件程序,其中硬件电路设计部分包括辅助电源、驱动电路以及电源输出的采样电路等；软件程序设计主要有用于全桥驱动的移相脉冲PWM程序、采样信号的AD转换程序以及稳定调节电源输出的PI控制程序。最后根据论文设计方案研制了一台输出为16kW的电源样机,并测试分析了不同输出下的波形；同时用研制的样机进行除尘实验。从测得的波形来看,变换器的超前桥臂和滞后桥臂完成了ZVS软开关,电源输出端得到了幅值、频率和脉宽都可调的高压脉冲方波；从除尘效果来看,其明显优于高压直流电源,验证了设计方案的正确性。
[Abstract]:ESP is a kind of environmental protection dedusting equipment with high efficiency, energy saving, simple operation and maintenance, which is widely used in thermal power, cement, metallurgy, chemical industry and so on. It plays an important role in reducing dust emission. High voltage power supply must be used in the operation of ESP, and the dust removal effect is often very different when different power supply is used. The use of high voltage pulse power supply can not only effectively improve the phenomenon of low corona voltage and reverse corona, but also improve the dust removal efficiency and reduce the energy consumption of the electrostatic precipitator when the traditional high voltage DC power supply is used. Therefore, it is of great significance to study and design the high-frequency and high-voltage pulse power supply. This paper first introduces the structure of high frequency and high voltage pulse power supply system for electrostatic precipitator, then analyzes and compares several commonly used power conversion circuits, and selects the phase-shifted full-bridge ZVS soft switch circuit as the main circuit structure of the power supply. The related parameters of phase-shifted full-bridge ZVS soft switching circuit are analyzed and designed in detail. Then, several common pulse forming circuits are analyzed and compared, and the multi-module pulse superposition technology and synchronous drive technology are introduced. A high voltage pulse forming circuit is designed. High frequency transformer is one of the important parts of power supply. This paper introduces several kinds of magnetic core materials and determines the type and parameters of magnetic core in detail. At the same time, the design steps of transformer and the parameters of transformer are given. Finally, the insulation design of transformer is carried out and the winding mode is determined. The control system based on DSP realizes the digital control of power supply and the function of real-time display and output. The hardware circuit and software program of the power supply control part based on TMS320LF2407 are designed in this paper. The hardware circuit design part includes the auxiliary power supply, the driving circuit and the sampling circuit of the power output. The software program includes phase-shift pulse PWM program for full-bridge drive, AD conversion program for sampling signal and Pi control program for stabilizing the output of power supply. Finally, according to the design of the paper, a power source prototype with 16kW output is developed, and the waveforms under different outputs are tested and analyzed, at the same time, the dust removal experiment is carried out with the developed prototype. According to the measured waveforms, the ZVS soft switch is accomplished by the leading and lagging arm of the converter, and the amplitude, frequency and pulse width of the high voltage pulse square wave can be adjusted at the output end of the power supply, which is obviously superior to the high voltage DC power supply in terms of the dust removal effect. The correctness of the design is verified.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：X701.2;TN86

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