基于谐振软开关的电除尘高频高压电源研制

发布时间：2018-02-15 00:19

本文关键词： 电除尘高频电源串并联谐振软开关　出处：《大连理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：静电除尘技术由于具有处理烟气量大、除尘效率高、维护方便等特点,是解决工业粉尘污染的主要手段。传统电除尘工频高压电源由于体积庞大、转换效率低、实时响应慢,制约了除尘效率的进一步提高。高频高压直流电源克服了工频电源的上述缺点,已成为静电除尘供电电源的发展趋势。本文基于谐振软开关原理,对电除尘用高频高压电源主电路拓扑、硬件结构、软件控制算法进行研究,并给出设计方案及实验论证。谐振软开关利用高频变压器本身的漏感和分布电容与外加的电感和电容一起构成谐振,从而实现功率器件的零电压或零电流开通与关断,能够有效减小通断损耗。本文研究了LCC串并联谐振软开关电路原理,分析、计算了谐振回路各模态下的等效电路以及电压、电流的时域特性,完成了谐振主回路中关键电路参数的设计。谐振软开关的电压调节包括移相控制和调频控制两种方式,调频控制通过改变触发脉冲频率来完成电压调节,通断损耗最小,是目前主要采用的电压调节方式。本文采用固定脉冲导通宽度调频的方法,使得功率器件零电流开通和零电流关断,实现电源输出的闭环调压控制。针对电除尘电源火花放电的检测与控制,本文总结了火花判定条件及三段式火花跟踪控制方法,能有效避免火花漏检、误检,达到理想的火花控制效果。目前,1.2A/80kV谐振软开关高频电源已在唐山某300MW燃煤电厂烧结机组投产使用,通过实时监测运行情况并采集信号波形,分析验证了该高频电源的谐振软开关特性,证明了设计的可行性。
[Abstract]:Electrostatic dusting technology is the main method to solve industrial dust pollution due to its characteristics of large amount of flue gas treatment, high dust removal efficiency, convenient maintenance, etc. Because of its large volume, low conversion efficiency and slow real time response, the traditional high voltage power supply for electrostatic dust collection is of great volume, low conversion efficiency and slow response in real time. The high frequency and high voltage DC power supply overcomes the above shortcomings of the power frequency power supply and has become the development trend of electrostatic dust collection power supply. This paper is based on the principle of resonant soft switch. The main circuit topology, hardware structure and software control algorithm of high frequency and high voltage power supply for electrostatic precipitator are studied, and the design scheme and experimental demonstration are given. The resonant soft switch uses the leakage inductance and the distributed capacitance of the high frequency transformer to form the resonance together with the additional inductance and capacitance, so that the zero voltage or zero current of the power device can be turned on and off. In this paper, the principle of LCC series and parallel resonant soft switching circuit is studied, and the equivalent circuit and the time domain characteristics of voltage and current in each mode of resonant circuit are analyzed and calculated. The design of key circuit parameters in the resonant main circuit is completed. The voltage regulation of the resonant soft switch includes two ways: phase shift control and frequency modulation control. The frequency modulation controls the voltage by changing the frequency of the trigger pulse, and the switching loss is minimized. In this paper, the method of fixed pulse conduction width frequency modulation is used to turn the zero current and zero current off of the power device. In view of the detection and control of spark discharge in the dust precipitating power supply, this paper summarizes the conditions of spark determination and the three-section spark tracking control method, which can effectively avoid the missed detection and false detection of spark. Achieve ideal spark control effect. At present, 1.2A / 80 kV resonant soft-switching high-frequency power supply has been put into operation in a 300MW coal-fired power plant in Tangshan. Through real-time monitoring and collecting signal waveform, the resonant soft-switching characteristics of the high-frequency power supply are analyzed and verified. The feasibility of the design is proved.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：X701.2;TN86

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