串联谐振软开关高频高压除尘电源的研究.pdf

华中科技大学硕士学位论文I 摘要随着环保问题的日益突出和节能减排战略的深入实施,治理粉尘对大气污染的问题已是刻不容缓。传统的电除尘设备中电源部分由于除尘效率低,动态响应太慢,功率因数较低等缺点已不足以满足现阶段的除尘环保要求。高性能的高频除尘电源取代传统的工频电源成为未来除尘领域中主要的电源设备已是一种趋势。本文首先确定采用串联谐振软开关电路作为除尘电源的拓扑结构,通过详细的理论分析推导出电路中各关键量的数学表达式,指出了该电路具有恒流源特性,抗负载短路能力强等特点。根据实际应用情况,分析了串并联谐振电路,并也推导出相应变量的数学表达式,为以后具体的控制和设计提供了理论依据。高频变压器是除尘电源的重要组成部分之一,本文给出了高频变压器设计的主要步骤,并对变压器的分布参数进行研究,指出了它对电源性能的具体影响。最后,提出了一种可以抑制分布电容影响的方法。由于除尘过程中负载具有不断变化的特点,除尘电源的控制至关重要。针对不同工况,本文分析了按火花率控制、按最高平均电压控制、按火花强度的二折线控制三种常用的控制方式。针对高比阻负载时易发生的反电晕现象,提出了间歇控制的方式。并对每一种控制方式进行了仿真模拟,指出了每一种控制方式的特点。最后,基于所做的理论分析和仿真模拟,对高频除尘电源的各个部分进行了设计,搭建了一台样机,进行了实验研究。实验结果表明,高频除尘电源稳态除尘工作性能良好,实验结果和理论仿真分析相一致。关键字:串联谐振,高频变压器,分布参数,电晕,火花放电华中科技大学硕士学位论文II Abstract As environmental issues e more prominent and the further implementation of energy saving strategies, Dealing with dust issues of air pollution is an urgent need. The traditional electrostatic precipitator have been insufficient to meet the new environmental requirements for its too low efficiency, too slow dynamic response, low power factor and other ings. In the dust field, High-frequency electrostatic precipitator power supply to replace the traditional power supply is a trend. Firstly, the paper determine the use of series resonant circuit as the main topology of electrostatic precipitator power supply, deduce the mathematical expression of the key parameter through detailed theoretical analysis, point out the circuit with a constant current source and strong resistance of short-circuit characteristics. Depending on the application, the paper also analysis the series-parallel resonant circuit, deduce the mathematical expression of the key parameter, provide a theoretical basis for the future design and control. High-frequency power transformer is an ponent of electrostatic precipitator power supply. The paper presents the key steps of high-frequency transformer design, research the distribution parameters of the transformer and its effect on the power supply, finally, put forward a method to reduce the effects t