【作者】 陈强；

【导师】 王慧贞；

【作者基本信息】 南京航空航天大学 ， 电气工程， 2019， 硕士

【摘要】 静电除尘(electrostatic precipitator,ESP)技术是目前控制烟尘排放,解决大气污染的最主要手段之一。随着环境问题的日益严峻,世界各国对工业烟尘排放提出了更高的标准。传统采用直流电晕荷电的静电除尘器,由于电场内火花闪络现象频发,在清除高比电阻粉尘时易出现反电晕现象,因此很难达到较高的排放标准。相比之下,脉冲型静电除尘电源能够有效解决上述问题,除尘效率更高,现已成为静电除尘电源的主要发展趋势之一。本文基于静电除尘的理论基础,综合国内外静电除尘电源技术的发展现状,深度探讨了高压开关型脉冲静电除尘电源的优势及其研究意义。论文以高压开关型脉冲静电除尘电源作为研究对象,重点对其电路特性、耦合电感设计、控制机制以及系统电路结构设计等展开研究。首先,论文研究了高压开关型拓扑的电路特性以及谐振回路参数的设计方法。根据主电路拓扑分模态介绍其工作原理,并建立谐振回路的数学模型,重点分析谐振状态与火花状态下的电路特性。通过对电路数学模型的分析,论文提出了高压开关型拓扑谐振回路参数的设计方法,并为除尘器控制系统的设计提供理论基础。其次,论文研究了应用于高压开关型拓扑的耦合电感设计方法,包括电感量计算方法与绕组结构优化设计方法。根据推导的耦合电感电流纹波表达式,确定了两侧电感的大小关系及耦合系数对电路的影响。同时,构建以耦合电感为变量的电路数学模型,分析电感大小对系统输出的影响,从而得到与谐振回路相匹配的耦合电感量。结合耦合电感的高频模型,本文提出了一种基于ANSYS有限元仿真的工程方法用于优化电感的绕组结构,可以实现绕组的最小分布电容设计。根据有限元仿真结果制作了多组不同绕组结构的耦合电感进行对比测试,验证了该优化方法的可行性。再次,论文总结了高压开关型脉冲电源的设计方法,依据该方法介绍了本课题中模拟样机电路参数的设计过程,并通过电路仿真验证理论分析的正确性。根据系统在稳态与非稳态工况下的仿真结果,提出一套适用于高压开关型脉冲电源的控制机制,包括系统运行参数自动控制与火花闪络保护控制。最后,论文构建了高压开关型脉冲电源的系统电路结构,包括谐振回路、耦合电感、供电电源、辅助电源以及控制系统等,并搭建了一台脉冲宽度20μs、脉冲幅值1.45kV的模拟样机进行实验验证,实验结果与理论分析及仿真结果基本一致,证明了所提技术方案的可行性。更多还原

【Abstract】 Electrostatic precipitator(ESP)is one of the most important means to control smoke emission and solve air pollution nowadays.With the increasingly serious environmental problems,countries around the world have set higher standards for industrial smoke emissions.For the traditional ESP with DC corona charge,spark flashover occurs frequently in the electric field of the precipitator.It is easy to occur back corona when charging the dust with high specific resistance,so it is hard to reach a higher dust emission standard.Compared with it,the pulsed power supply can solve the above problems effectively.The efficiency of dust collection is higher,so it has become one of the main development trends of ESP power supply.Based on the theory of electrostatic precipitation and the development status of ESP power supply at home and abroad,the advantages and significances of HV switch type pulsed power supply for ESP are discussed in this paper.and focuses on its circuit characteristics,coupled inductor design,control mechanism and system circuit structure design.Firstly,the characteristics of HV switch type topology and the design method of resonant circuit are studied.According to the main circuit topology,the working principle of the circuit is described,and the mathematical model of the resonant circuit is established.The resonant and spark state of the circuit are analyzed in detail.Based on the mathematical model of the circuit,the design method of resonant circuit parameters is proposed,it also provides a theoretical basis for the design of ESP control system.Secondly,the design method of coupled inductor applied to HV switch type topology is studied,including the calculation method of inductance value and the optimal design method of winding structure.Based on the expression of inductor current ripple,the relationship between the inductors is determined,and the influence of the coupling coefficient is analyzed.The mathematical models with coupled inductance value as variable are established.Then the influence of inductor value on output is analyzed according to the mathematical models,the value of coupled inductor matching with the system is obtained.Considering the high frequency model of coupled inductor,an engineering method based on ANSYS finite element simulation(FAE)is proposed to optimize the structure of inductor windings,which can realize the minimum distributed capacitance design of single winding.In order to verify the feasibility of the optimization method,the coupled inductors with different winding structures are designed and manufactured for comparative analysis.Thirdly,this paper summarizes the design method of HV switch type pulsed power supply.According to this method,the design process of circuit parameters of simulation prototype in this subject is introduced,and the correctness of theoretical analysis is verified by circuit simulation.According to the simulation results of the system under steady and unsteady conditions,a control mechanism suitable for HV switch type pulsed power supply is proposed,including automatic control of system operation parameters and spark flashover protection control.Finally,the system circuit structure of HV switch type pulsed power supply is constructed,including resonant circuit,coupled inductor,power supply,auxiliary power supply and control system.And a simulation prototype with pulse width of 20 μs and pulse amplitude of 1.45 kV is built for experimental verification.The experimental results are basically consistent with the theoretical analysis and simulation results,which proves the feasibility of the proposed technical scheme.更多还原