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<h1>變流電路諧波內(nèi)補(bǔ)償?shù)难芯?/h1> <div id="vpbvfvd" class="authorTimeSource"> <span>作者：</span> <span>時間：2011-02-13</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="xzthtrp" 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="bbnplbh" 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' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="btfhbhh" class="content" id="contentDiv" style="position:relative;"> <div id="dxhtfnt" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><p>摘要：高頻電力有源濾波器是一種新興的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/諧波"><em>諧波</em></a>及無功動態(tài)<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/補(bǔ)償"><em>補(bǔ)償</em></a>裝置。電力有源濾波器作為<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/諧波"><em>諧波</em></a>發(fā)生器，加在變換器直流側(cè)，以抵消變換器產(chǎn)生的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/諧波"><em>諧波</em></a>，起到諧波內(nèi)<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/補(bǔ)償"><em>補(bǔ)償</em></a>的作用。同時，用有源濾波器取代電解電容，實現(xiàn)電解電容的“硅解。本文介紹其工作原理并做了相應(yīng)的PSPICE仿真。</p>本文引用地址：<a href="http://www.ex-cimer.com/article/179860.htm">http://www.ex-cimer.com/article/179860.htm</a><p>關(guān)鍵詞：諧波<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/補(bǔ)償"><em>補(bǔ)償</em></a>電力有源濾波器硅解</p><p>1引言</p><p>　　隨著電力電子裝置的迅速發(fā)展，產(chǎn)生了兩方面的問題：一是電力電子<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/變流"><em>變流</em></a><a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電路"><em>電路</em></a>產(chǎn)生的諧波干擾已成為電力系統(tǒng)之中諧波的主要來源，諧波造成的危害日益嚴(yán)重。二是電力電子系統(tǒng)中的無源元件，特別是電解電容在成本、體積和可靠性等方面無多大改進(jìn)。由于諧波引起發(fā)熱危及電解電容的使用壽命，因此，電解電容成為電力電子系統(tǒng)中最薄弱的環(huán)節(jié)。</p><p>　　為了消除諧波的影響，近幾年國內(nèi)外進(jìn)行了電壓型和電流型有源濾波器的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/研究"><em>研究</em></a>，在電網(wǎng)交流側(cè)進(jìn)行補(bǔ)償。在電力電子系統(tǒng)中帶負(fù)載的變換器是一個諧波源，引起直流側(cè)的電流和電壓的波動，若人為地在直流側(cè)再加一個反相位的諧波源，即可控有源濾波器就可使兩者諧波相互抵消，達(dá)到諧波內(nèi)補(bǔ)償?shù)淖饔?。用高頻有源濾波器取代電解電容是一種“硅解無源元件的辦法。這種新結(jié)構(gòu)既可使諧波不外傳，又可取消電解電容。</p><p>　　本文介紹電壓型逆變器用作直流側(cè)電力有源濾波器濾除諧波，同時取代電解電容的原理及方案。</p><p>2諧波補(bǔ)償原理</p><p>　　電壓型變換器在直流環(huán)節(jié)中的基本元件是電解電容，它可以吸收負(fù)載和電源產(chǎn)生的諧波。用電力有源濾波器替代電解電容，一方面“硅解電解電容，另一方面可以更好地實現(xiàn)諧波補(bǔ)償。</p><p>　　圖1為電壓型逆變器主<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電路"><em>電路</em></a>圖。為簡化分析，<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/電路"><em>電路</em></a>采用直流電壓源供電。圖中UB為直流電壓源，RB、LB分別為電壓源內(nèi)部電阻和電感。虛線框內(nèi)為取代電解電容的電力有源濾波器。</p><p>　　負(fù)載為感性時，逆變器輸入電流包括兩部分：直流量id.dc和紋波id.ac即：</p><p>id=id.dc＋id.ac(1)</p><p>為補(bǔ)償諧波電流id.ac，要求電力有源濾波器輸入電流ig與id.ac大小相等方向相反，即：</p><p>ig=－id.ac(2)</p><p>這時直流電壓源輸出電流為：</p><p>i=id＋ig=id.dc(3)</p><p>直流電壓源輸出電流等于逆變器輸入電流的直流分量。</p><p align="center"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" height="180" alt="Wp1.gif (7835 字節(jié))" src="http://editerupload.eepw.com.cn/fetch/20131009/179860_1_0.jpg" width="377" style="zoom: 1" /></p><p align="center">圖1用有源濾波器替代電解電容的單相逆變器</p><p>　　電力有源濾波器為單相電流型，開關(guān)器件S1－S4采用功率MOSFET，其工作頻率高，響應(yīng)速度快。LF為有源濾波器直流側(cè)儲能元件，C為解調(diào)交流電容。</p><p>　　電抗器LF中的電流if經(jīng)開關(guān)器件S1－S4切換，在有源濾波器輸入端產(chǎn)生包含逆變器輸入紋波電流id.ac在內(nèi)的調(diào)制波電流if.ac。電流if.ac經(jīng)交流電容解調(diào)后產(chǎn)生與逆變器輸入紋波電流id.ac近似等值而反向的電流ig，從而補(bǔ)償了逆變器輸入紋波電流id.ac。</p><p>3電力有源濾波器的控制</p><p>　　電力有源濾波器采用直流環(huán)電壓滯環(huán)控制的方法，控制電路方框圖如圖2所示。它包括基本控制，電抗器LF的平均電流控制及諧振抑制等。</p><p align="center"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" height="259" alt="Wp2.gif (11707 字節(jié))" src="http://editerupload.eepw.com.cn/fetch/20131009/179860_1_1.jpg" width="438" style="zoom: 1" /></p><p align="center">圖2有源濾波器控制框圖 </span>  <div class="dlfrdth" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img src="https://webstorage.eepw.com.cn/images/display/reg.jpg" border="0" usemap="#Map" /> 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