MMC并网逆变器（滑模控制）1.MMC工作在整流侧，子模块个数N＝22，直流侧电压Udc＝11kV，交流侧电压6.6kV2.控制器采用双闭环控制，外环控制有功功率，采用PI调节器，电流内环采用无
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MMC并网逆变器（滑模控制）1.MMC工作在整流侧，子模块个数N＝22，直流侧电压Udc＝11kV，交流侧电压6.6kV2.控制器采用双闭环控制，外环控制有功功率，采用PI调节器，电流内环采用无源滑模控制＋前馈解耦；3.环流抑制采用PIR控制，能够抑制环流二倍频分量；4.采用最近电平逼近调制（NLM），5.均压排序：电容电压排序采用快速排序，判断桥臂电流方向确定投入切除；结果：1.输出功率能够稳定在2MW和3MW，无功稳定在0Var；3.网侧电压电流波形均为对称的三相电压和三相电流波形，网侧电流THD＝2.94％<3％，符合并网要求；4.环流抑制后桥臂电流的波形得到改善，桥臂电流THD由21.29％降至3.14％，环流波形也可以看到得到抑制；5.电容电压能够稳定变化 <link href="/image.php?url=https://csdnimg.cn/release/download_crawler_static/css/base.min.css" rel="stylesheet"/><link href="/image.php?url=https://csdnimg.cn/release/download_crawler_static/css/fancy.min.css" rel="stylesheet"/><link href="/image.php?url=https://csdnimg.cn/release/download_crawler_static/90240580/2/raw.css" rel="stylesheet"/><div id="sidebar" style="display: none"><div id="outline"></div></div><div class="pf w0 h0" data-page-no="1" id="pf1"><div class="pc pc1 w0 h0"><img alt="" class="bi x0 y0 w1 h1" src="/image.php?url=https://csdnimg.cn/release/download_crawler_static/90240580/bg1.jpg"/><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">MMC<span class="_ _0"> </span><span class="ff2">并网逆变器<span class="ff3">（</span>滑模控制<span class="ff3">）</span></span></div><div class="t m0 x1 h2 y2 ff2 fs0 fc0 sc0 ls0 ws0">摘要<span class="ff3">：</span>本文介绍了一种基于滑模控制的<span class="_ _1"> </span><span class="ff1">MMC<span class="ff3">（</span>Modular Multilevel Converter<span class="ff3">）</span></span>并网逆变器<span class="ff4">。</span></div><div class="t m0 x1 h2 y3 ff2 fs0 fc0 sc0 ls0 ws0">该逆变器工作在整流侧<span class="ff3">，</span>具有<span class="_ _1"> </span><span class="ff1">22<span class="_ _0"> </span></span>个子模块<span class="ff3">，</span>直流电压为<span class="_ _1"> </span><span class="ff1">11kV<span class="ff3">，</span></span>交流电压为<span class="_ _1"> </span><span class="ff1">6.6kV<span class="ff4">。</span></span>它采用双闭环</div><div class="t m0 x1 h2 y4 ff2 fs0 fc0 sc0 ls0 ws0">控制策略<span class="ff3">，</span>外环控制有功功率<span class="ff3">，</span>内环控制电流<span class="ff4">。</span>滑模控制和前馈解耦技术被应用于电流内环控制<span class="ff4">。</span>此</div><div class="t m0 x1 h2 y5 ff2 fs0 fc0 sc0 ls0 ws0">外<span class="ff3">，</span>还采用了<span class="_ _1"> </span><span class="ff1">PIR<span class="_ _0"> </span></span>控制用于环流抑制和最近电平逼近调制<span class="ff3">（<span class="ff1">NLM</span>）</span>用于调制<span class="ff4">。</span>实验结果表明<span class="ff3">，</span>该<span class="_ _1"> </span><span class="ff1">MMC</span></div><div class="t m0 x1 h2 y6 ff2 fs0 fc0 sc0 ls0 ws0">并网逆变器能够稳定输出功率<span class="ff3">，</span>无功稳定在<span class="_ _1"> </span><span class="ff1">0Var<span class="ff4">。</span></span>网侧电压和电流波形均为对称的三相波形<span class="ff3">，</span>网侧</div><div class="t m0 x1 h2 y7 ff2 fs0 fc0 sc0 ls0 ws0">电流的总谐波失真率<span class="ff3">（<span class="ff1">THD</span>）</span>小于<span class="_ _1"> </span><span class="ff1">3%<span class="ff3">，</span></span>满足并网要求<span class="ff4">。</span>同时<span class="ff3">，</span>通过环流抑制措施<span class="ff3">，</span>桥臂电流的波形得</div><div class="t m0 x1 h2 y8 ff2 fs0 fc0 sc0 ls0 ws0">到改善<span class="ff3">，<span class="ff1">THD<span class="_ _0"> </span></span></span>由<span class="_ _1"> </span><span class="ff1">21.29%</span>降至<span class="_ _1"> </span><span class="ff1">3.14%<span class="ff4">。</span></span>此外<span class="ff3">，</span>电容电压也能够稳定变化<span class="ff4">。</span></div><div class="t m0 x1 h2 y9 ff2 fs0 fc0 sc0 ls0 ws0">关键词<span class="ff3">：<span class="ff1">MMC<span class="_ _0"> </span></span></span>并网逆变器<span class="ff3">，</span>滑模控制<span class="ff3">，</span>双闭环控制<span class="ff3">，</span>有功功率控制<span class="ff3">，</span>电流内环控制<span class="ff3">，</span>环流抑制<span class="ff3">，</span>电压</div><div class="t m0 x1 h2 ya ff2 fs0 fc0 sc0 ls0 ws0">电流波形<span class="ff3">，<span class="ff1">THD</span>，<span class="ff1">NLM<span class="_ _0"> </span></span></span>调制</div><div class="t m0 x1 h2 yb ff1 fs0 fc0 sc0 ls0 ws0">1.<span class="_ _2"> </span><span class="ff2">引言</span></div><div class="t m0 x1 h2 yc ff2 fs0 fc0 sc0 ls0 ws0">随着可再生能源发电技术的快速发展<span class="ff3">，</span>越来越多的可再生能源电站开始并网运行<span class="ff4">。</span>而<span class="_ _1"> </span><span class="ff1">MMC<span class="_ _0"> </span></span>并网逆变器</div><div class="t m0 x1 h2 yd ff2 fs0 fc0 sc0 ls0 ws0">作为一种新型的逆变器<span class="ff3">，</span>具有模块化<span class="ff4">、</span>可控性强<span class="ff4">、</span>效率高等优点<span class="ff3">，</span>正逐渐成为并网逆变器的首选<span class="ff4">。</span>本</div><div class="t m0 x1 h2 ye ff2 fs0 fc0 sc0 ls0 ws0">文介绍了一种基于滑模控制的<span class="_ _1"> </span><span class="ff1">MMC<span class="_ _0"> </span></span>并网逆变器<span class="ff3">，</span>以实现稳定的功率输出和优良的波形质量<span class="ff4">。</span></div><div class="t m0 x1 h2 yf ff1 fs0 fc0 sc0 ls0 ws0">2.<span class="_ _2"> </span><span class="ff2">系统架构</span></div><div class="t m0 x1 h2 y10 ff2 fs0 fc0 sc0 ls0 ws0">该<span class="_ _1"> </span><span class="ff1">MMC<span class="_ _0"> </span></span>并网逆变器采用了<span class="_ _1"> </span><span class="ff1">22<span class="_ _0"> </span></span>个子模块<span class="ff3">，</span>直流电压为<span class="_ _1"> </span><span class="ff1">11kV<span class="ff3">，</span></span>交流电压为<span class="_ _1"> </span><span class="ff1">6.6kV<span class="ff4">。</span></span>控制器采用双闭环</div><div class="t m0 x1 h2 y11 ff2 fs0 fc0 sc0 ls0 ws0">控制策略<span class="ff3">，</span>外环控制有功功率<span class="ff3">，</span>内环控制电流<span class="ff4">。</span>具体来说<span class="ff3">，</span>外环控制采用了<span class="_ _1"> </span><span class="ff1">PI<span class="_ _0"> </span></span>调节器<span class="ff3">，</span>通过调节子</div><div class="t m0 x1 h2 y12 ff2 fs0 fc0 sc0 ls0 ws0">模块的开关角度来控制有功功率输出<span class="ff4">。</span>而内环控制则采用了无源滑模控制和前馈解耦技术<span class="ff3">，</span>以实现精</div><div class="t m0 x1 h2 y13 ff2 fs0 fc0 sc0 ls0 ws0">确的电流控制和抑制谐波<span class="ff4">。</span></div><div class="t m0 x1 h2 y14 ff1 fs0 fc0 sc0 ls0 ws0">3.<span class="_ _2"> </span><span class="ff2">环流抑制策略</span></div><div class="t m0 x1 h2 y15 ff2 fs0 fc0 sc0 ls0 ws0">为了抑制环流二倍频分量<span class="ff3">，</span>本文采用了<span class="_ _1"> </span><span class="ff1">PIR<span class="_ _0"> </span></span>控制策略<span class="ff4">。</span>该策略通过调节子模块的开关角度<span class="ff3">，</span>使环流的</div><div class="t m0 x1 h2 y16 ff2 fs0 fc0 sc0 ls0 ws0">二倍频分量尽量接近零<span class="ff4">。</span>实验结果表明<span class="ff3">，</span>此环流抑制策略有效降低了桥臂电流的谐波含量<span class="ff3">，</span>改善了电</div><div class="t m0 x1 h2 y17 ff2 fs0 fc0 sc0 ls0 ws0">流波形<span class="ff4">。</span></div><div class="t m0 x1 h2 y18 ff1 fs0 fc0 sc0 ls0 ws0">4.<span class="_ _2"> </span><span class="ff2">最近电平逼近调制</span>(NLM)</div><div class="t m0 x1 h2 y19 ff2 fs0 fc0 sc0 ls0 ws0">最近电平逼近调制<span class="ff1">(NLM)</span>是一种非常有效的调制技术<span class="ff3">，</span>能够提高逆变器的效率和波形质量<span class="ff4">。</span>在本文的</div><div class="t m0 x1 h2 y1a ff1 fs0 fc0 sc0 ls0 ws0">MMC<span class="_ _0"> </span><span class="ff2">并网逆变器中<span class="ff3">，</span></span>NLM<span class="_ _0"> </span><span class="ff2">被应用于调制<span class="ff4">。</span>该调制技术能够实现电容电压的均压排序<span class="ff3">，</span>并通过快速排序</span></div><div class="t m0 x1 h2 y1b ff2 fs0 fc0 sc0 ls0 ws0">判断桥臂电流方向<span class="ff3">，</span>确定投入切除<span class="ff3">，</span>从而提高逆变器的运行效率<span class="ff4">。</span></div><div class="t m0 x1 h2 y1c ff1 fs0 fc0 sc0 ls0 ws0">5.<span class="_ _2"> </span><span class="ff2">实验结果与分析</span></div><div class="t m0 x1 h2 y1d ff2 fs0 fc0 sc0 ls0 ws0">通过实验<span class="ff3">，</span>我们获得了以下结果<span class="ff3">：</span>输出功率能够稳定在<span class="_ _1"> </span><span class="ff1">2MW<span class="_ _0"> </span></span>和<span class="_ _1"> </span><span class="ff1">3MW<span class="ff3">，</span></span>无功稳定在<span class="_ _1"> </span><span class="ff1">0Var<span class="ff3">；</span></span>网侧电压和</div><div class="t m0 x1 h2 y1e ff2 fs0 fc0 sc0 ls0 ws0">电流波形均为对称的三相电压和电流波形<span class="ff3">，</span>网侧电流的<span class="_ _1"> </span><span class="ff1">THD<span class="_ _0"> </span></span>小于<span class="_ _1"> </span><span class="ff1">3%<span class="ff3">，</span></span>满足并网要求<span class="ff3">；</span>桥臂电流的波</div></div><div class="pi" data-data='{"ctm":[1.568627,0.000000,0.000000,1.568627,0.000000,0.000000]}'></div></div>