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<h1>基于三電平拓?fù)涞碾娏﹄娮幼儔浩餮芯?/h1> <div id="pyznzbh" class="authorTimeSource"> <span>作者：</span> <span>時間：2012-03-06</span> <span>來源：網(wǎng)絡(luò)</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:150px;margin-right:0px; text-align:right;"> <div id="efxpdkc" class="nav0"> <ul> <li style="width:150px;"><a href="javascript:void(0);"><img src="http://www.ex-cimer.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />英飛凌汽車電子生態(tài)圈</a> <ul> <li style="width:150px;text-align:center;"><img src="http://www.ex-cimer.com/event/company/images/code_2.jpg" width="150"><br />掃碼關(guān)注<br />獲取最新最全汽車電子<br />技術(shù)方案與實用技巧</li> </ul> </li> </ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="ndtcrah" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' 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class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電力"><em>電力</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電子"><em>電子</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/變壓器"><em>變壓器</em></a>(PET)。輸入級、隔離級與輸出級結(jié)構(gòu)分別采用二極管箝位式三<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電平"><em>電平</em></a>PWM整流器、零電壓開關(guān)半橋三<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電平"><em>電平</em></a>DC／DC變換器和兩電平逆變器。與兩電平PET相比，可在有效提高輸入電壓等級的同時降低開關(guān)損耗。針對<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/變壓器"><em>變壓器</em></a>各環(huán)節(jié)結(jié)構(gòu)特點設(shè)計了控制方案，并在配電系統(tǒng)環(huán)境下對其進(jìn)行了建模和仿真。仿真結(jié)果表明，在穩(wěn)態(tài)運行及電源波動、負(fù)載投切等動態(tài)運行條件下，三電平PET均能保持初、次級良好的電壓電流波形，且能維持輸出電壓恒定，有效抑制了電網(wǎng)與負(fù)載的擾動，實現(xiàn)了良好的電能質(zhì)量調(diào)節(jié)。<br />關(guān)鍵詞：<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/變壓器"><em>變壓器</em></a>；三電平；零電壓開關(guān)<br /><br />1 引言<br /> 近年來，一種<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/基于"><em>基于</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電力"><em>電力</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電子"><em>電子</em></a>變換技術(shù)的新型電網(wǎng)配電變壓裝置，即PET，受到國內(nèi)外學(xué)者的廣泛關(guān)注。它不僅體積小、重量輕，而且具有交直流轉(zhuǎn)換能力，可靈活地將各種分布式發(fā)電系統(tǒng)接入電網(wǎng)，比傳統(tǒng)變壓器更能適應(yīng)智能電網(wǎng)環(huán)境下用戶對電能的個性化需求。<br /> 在三電平結(jié)構(gòu)中，開關(guān)管承受的電壓應(yīng)力僅為兩電平<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>的一半，因此可以成倍提升輸入級的電壓，解決PET在配電系統(tǒng)中的實用化問題，且不存在開關(guān)管直接串聯(lián)電路中的器件均壓問題。與模塊串并聯(lián)<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/拓?fù)?><em>拓?fù)?/em></a>相比，可以減少所用器件的數(shù)量，提高PET的可靠性并降低成本。但目前國內(nèi)還未見公開發(fā)表的有關(guān)三電平結(jié)構(gòu)PET的相關(guān)文獻(xiàn)。這里在上述文獻(xiàn)的基礎(chǔ)上提出改進(jìn)的三電平PET，設(shè)計了三相系統(tǒng)中各環(huán)節(jié)的控制策略，并通過仿真驗證了其拓?fù)浜涂刂撇呗缘挠行浴?br /><br />2 三電平PET電路介紹<br /> 圖1為三電平PET的拓?fù)浣Y(jié)構(gòu)。其工作原理為：輸入級將高壓工頻交流電經(jīng)整流后變成直流電，在隔離級被調(diào)制成高頻方波加載到高頻變壓器，降壓后在次級又還原成直流電，最后經(jīng)輸出級逆變成三相低壓工頻交流電。由于中間隔離級的存在，在電源發(fā)生電壓波動、頻率閃變、諧波注入或負(fù)載投切時，三電平PET能避免系統(tǒng)側(cè)與負(fù)載側(cè)的相互影響，維持初、次級良好的電壓電流波形，且輸出恒定的電壓。</p>本文引用地址：<a href="http://www.ex-cimer.com/article/177790.htm">http://www.ex-cimer.com/article/177790.htm</a><p align="center"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" border="0" alt="a.jpg" width="400" height="413" src="http://editerupload.eepw.com.cn/fetch/20131009/177790_1_0.jpg" /></p><p><br />2．1 輸入級<br /> 系統(tǒng)的輸入級采用二極管箝位式三電平PWM整流器，每一個橋臂由4個功率開關(guān)構(gòu)成，因此每一個主功率開關(guān)所承受的電壓峰值只有兩電平PWM整流器的一半，而且三電平PWM整流器有27個開關(guān)矢量，因此其在開關(guān)頻率不是很高的情況下也能保證網(wǎng)側(cè)良好的電流波形，其諧波和畸變率大大小于兩電平PWM整流器。高頻的PWM整流器可以保證網(wǎng)側(cè)電流與電源之間功率因數(shù)為1。<br />2．2 中間隔離級<br /> 系統(tǒng)的中間隔離級在原有三電平PET基礎(chǔ)上作了改進(jìn)，采用零電壓開關(guān)半橋三電平DC／DC變換器，對配電變壓器不考慮能量的雙向流動，故在變壓器次級采用全橋不控整流電路，開關(guān)管兩端并聯(lián)電容為其自身結(jié)電容。與兩電平PET中的DC／DC變換器相比，通過變換器初級2只中點箝位二極管使得4只開關(guān)管電壓應(yīng)力僅為輸入直流電壓的一半，且通過諧振電感Lk對4只開關(guān)管上的并聯(lián)結(jié)電容進(jìn)行充放電，使相應(yīng)的結(jié)電容兩端電壓達(dá)到零，實現(xiàn)零電壓開關(guān)，飛躍電容Cs用來將2對開關(guān)管開關(guān)過程連接起來，這樣能有效減小開關(guān)損耗，提高變換器效率。<br />2．3 輸出級<br /> 由于隔離級已將高壓直流電變換為約600 V的低壓直流電，且PET輸出目標(biāo)也是380 V低壓用電，在此電壓等級下，目前的IGBT器件已足夠成熟可靠，因此輸出級采用兩電平PWM逆變器，并輔以LC濾波器。<br /></span>  <div class="ghwkdwm" id="coverDiv" class="article_reg" 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