發(fā)布時(shí)間：2018-02-15 00:19

  本文關(guān)鍵詞： 電除塵 高頻電源 串并聯(lián)諧振 軟開關(guān)　出處：《大連理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：靜電除塵技術(shù)由于具有處理煙氣量大、除塵效率高、維護(hù)方便等特點(diǎn),是解決工業(yè)粉塵污染的主要手段。傳統(tǒng)電除塵工頻高壓電源由于體積龐大、轉(zhuǎn)換效率低、實(shí)時(shí)響應(yīng)慢,制約了除塵效率的進(jìn)一步提高。高頻高壓直流電源克服了工頻電源的上述缺點(diǎn),已成為靜電除塵供電電源的發(fā)展趨勢。本文基于諧振軟開關(guān)原理,對電除塵用高頻高壓電源主電路拓?fù)�、硬件結(jié)構(gòu)、軟件控制算法進(jìn)行研究,并給出設(shè)計(jì)方案及實(shí)驗(yàn)論證。 諧振軟開關(guān)利用高頻變壓器本身的漏感和分布電容與外加的電感和電容一起構(gòu)成諧振,從而實(shí)現(xiàn)功率器件的零電壓或零電流開通與關(guān)斷,能夠有效減小通斷損耗。本文研究了LCC串并聯(lián)諧振軟開關(guān)電路原理,分析、計(jì)算了諧振回路各模態(tài)下的等效電路以及電壓、電流的時(shí)域特性,完成了諧振主回路中關(guān)鍵電路參數(shù)的設(shè)計(jì)。 諧振軟開關(guān)的電壓調(diào)節(jié)包括移相控制和調(diào)頻控制兩種方式,調(diào)頻控制通過改變觸發(fā)脈沖頻率來完成電壓調(diào)節(jié),通斷損耗最小,是目前主要采用的電壓調(diào)節(jié)方式。本文采用固定脈沖導(dǎo)通寬度調(diào)頻的方法,使得功率器件零電流開通和零電流關(guān)斷,實(shí)現(xiàn)電源輸出的閉環(huán)調(diào)壓控制。針對電除塵電源火花放電的檢測與控制,本文總結(jié)了火花判定條件及三段式火花跟蹤控制方法,能有效避免火花漏檢、誤檢,達(dá)到理想的火花控制效果。 目前,1.2A/80kV諧振軟開關(guān)高頻電源已在唐山某300MW燃煤電廠燒結(jié)機(jī)組投產(chǎn)使用,通過實(shí)時(shí)監(jiān)測運(yùn)行情況并采集信號波形,分析驗(yàn)證了該高頻電源的諧振軟開關(guān)特性,證明了設(shè)計(jì)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.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：X701.2;TN86

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