级联H桥 离网三相逆变器采用级联H桥多电平拓扑，每个H桥直流测电压为24V，5个H桥串联（电压，H桥个数可以自己调加），系统包含开环跟闭环来两个仿真 交流测接负载；可以自己设置输出频率 采用电压
资源内容介绍
级联H桥。离网三相逆变器采用级联H桥多电平拓扑，每个H桥直流测电压为24V，5个H桥串联（电压，H桥个数可以自己调加），系统包含开环跟闭环来两个仿真。交流测接负载；可以自己设置输出频率。采用电压电流双闭环控制。负载电流THD只有0.9%。前两张图为开环仿真后两张为闭环仿真整个仿真全部离散化，采用离散解析器，离散PI。控制与采样环节全部自己手工搭建，没有采Matlab自带的模块。matlab2021b <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/90239541/2/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/90239541/bg1.jpg"/><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">级联<span class="_ _0"> </span><span class="ff2">H<span class="_ _1"> </span></span>桥在离网三相逆变器中的应用</div><div class="t m0 x1 h2 y2 ff1 fs0 fc0 sc0 ls0 ws0">摘要<span class="ff3">：</span>离网三相逆变器是一种常见的电力转换设备<span class="ff3">，</span>用于将直流电能转换为交流电能<span class="ff3">，</span>广泛应用于太</div><div class="t m0 x1 h2 y3 ff1 fs0 fc0 sc0 ls0 ws0">阳能发电<span class="ff4">、</span>风能发电等领域<span class="ff4">。</span>本文介绍了离网三相逆变器中采用的级联<span class="_ _0"> </span><span class="ff2">H<span class="_ _1"> </span></span>桥多电平拓扑结构<span class="ff3">，</span>以及相</div><div class="t m0 x1 h2 y4 ff1 fs0 fc0 sc0 ls0 ws0">关的开环和闭环仿真<span class="ff4">。</span></div><div class="t m0 x1 h2 y5 ff2 fs0 fc0 sc0 ls0 ws0">1.<span class="_ _2"> </span><span class="ff1">引言</span></div><div class="t m0 x1 h2 y6 ff1 fs0 fc0 sc0 ls0 ws0">离网三相逆变器是实现电力系统独立运行的重要设备之一<span class="ff4">。</span>其主要功能是将直流电能转换为交流电能</div><div class="t m0 x1 h2 y7 ff3 fs0 fc0 sc0 ls0 ws0">，<span class="ff1">并将交流电能输出到负载上<span class="ff4">。</span>为了提高输出波形质量和电能转换效率</span>，<span class="ff1">离网三相逆变器采用了级联</span></div><div class="t m0 x1 h2 y8 ff2 fs0 fc0 sc0 ls0 ws0">H<span class="_ _1"> </span><span class="ff1">桥多电平拓扑结构<span class="ff4">。</span>本文将介绍该拓扑结构的原理和特点<span class="ff3">，</span>并通过开环和闭环仿真验证其性能<span class="ff4">。</span></span></div><div class="t m0 x1 h2 y9 ff2 fs0 fc0 sc0 ls0 ws0">2.<span class="_ _2"> </span><span class="ff1">级联<span class="_ _0"> </span></span>H<span class="_ _1"> </span><span class="ff1">桥多电平拓扑结构</span></div><div class="t m0 x1 h2 ya ff1 fs0 fc0 sc0 ls0 ws0">级联<span class="_ _0"> </span><span class="ff2">H<span class="_ _1"> </span></span>桥多电平拓扑结构由多个<span class="_ _0"> </span><span class="ff2">H<span class="_ _1"> </span></span>桥组成<span class="ff3">，</span>每个<span class="_ _0"> </span><span class="ff2">H<span class="_ _1"> </span></span>桥的直流测电压为<span class="_ _0"> </span><span class="ff2">24V<span class="ff4">。</span></span>通过串联多个<span class="_ _0"> </span><span class="ff2">H<span class="_ _1"> </span></span>桥<span class="ff3">，</span>可</div><div class="t m0 x1 h2 yb ff1 fs0 fc0 sc0 ls0 ws0">以得到不同电平的输出电压<span class="ff3">，</span>从而实现多电平输出<span class="ff4">。</span>在离网三相逆变器中<span class="ff3">，</span>通常采用<span class="_ _0"> </span><span class="ff2">5<span class="_ _1"> </span></span>个<span class="_ _0"> </span><span class="ff2">H<span class="_ _1"> </span></span>桥串联<span class="ff3">，</span></div><div class="t m0 x1 h2 yc ff1 fs0 fc0 sc0 ls0 ws0">当然<span class="ff3">，</span>根据需求<span class="ff3">，</span>可以调整电压和<span class="_ _0"> </span><span class="ff2">H<span class="_ _1"> </span></span>桥的个数<span class="ff4">。</span>该拓扑结构的优点是能够提供更接近正弦波的输出电</div><div class="t m0 x1 h2 yd ff1 fs0 fc0 sc0 ls0 ws0">压<span class="ff3">，</span>减小谐波含量<span class="ff3">，</span>提高电能转换效率<span class="ff4">。</span></div><div class="t m0 x1 h2 ye ff2 fs0 fc0 sc0 ls0 ws0">3.<span class="_ _2"> </span><span class="ff1">开环仿真</span></div><div class="t m0 x1 h2 yf ff1 fs0 fc0 sc0 ls0 ws0">开环仿真是对离网三相逆变器进行性能评估的重要手段之一<span class="ff4">。</span>本文使用自行搭建的控制与采样环节<span class="ff3">，</span></div><div class="t m0 x1 h2 y10 ff1 fs0 fc0 sc0 ls0 ws0">采用离散解析器和离散<span class="_ _0"> </span><span class="ff2">PI<span class="_ _1"> </span></span>控制算法进行开环仿真<span class="ff4">。</span>仿真过程中<span class="ff3">，</span>将交流负载接入系统<span class="ff3">，</span>并自行设置</div><div class="t m0 x1 h2 y11 ff1 fs0 fc0 sc0 ls0 ws0">输出频率<span class="ff4">。</span>通过开环仿真<span class="ff3">，</span>可以观察系统的基本性能<span class="ff3">，</span>包括输出电压波形<span class="ff4">、</span>负载电流等<span class="ff4">。</span></div><div class="t m0 x1 h2 y12 ff2 fs0 fc0 sc0 ls0 ws0">4.<span class="_ _2"> </span><span class="ff1">闭环仿真</span></div><div class="t m0 x1 h2 y13 ff1 fs0 fc0 sc0 ls0 ws0">闭环仿真是对离网三相逆变器闭环控制性能的评估<span class="ff4">。</span>本文针对离网三相逆变器采用电压电流双闭环控</div><div class="t m0 x1 h2 y14 ff1 fs0 fc0 sc0 ls0 ws0">制的特点<span class="ff3">，</span>进行闭环仿真<span class="ff4">。</span>仿真过程中<span class="ff3">，</span>使用自行搭建的控制与采样环节<span class="ff3">，</span>观察系统的跟踪能力和稳</div><div class="t m0 x1 h2 y15 ff1 fs0 fc0 sc0 ls0 ws0">定性<span class="ff4">。</span>此外<span class="ff3">，</span>本文还对负载电流的总谐波失真率<span class="ff3">（<span class="ff2">THD</span>）</span>进行了评估<span class="ff3">，</span>结果显示负载电流<span class="_ _0"> </span><span class="ff2">THD<span class="_ _1"> </span></span>仅为</div><div class="t m0 x1 h2 y16 ff2 fs0 fc0 sc0 ls0 ws0">0.9%<span class="ff3">，<span class="ff1">说明系统具有很好的波形质量<span class="ff4">。</span></span></span></div><div class="t m0 x1 h2 y17 ff2 fs0 fc0 sc0 ls0 ws0">5.<span class="_ _2"> </span><span class="ff1">结论</span></div><div class="t m0 x1 h2 y18 ff1 fs0 fc0 sc0 ls0 ws0">本文介绍了离网三相逆变器中采用的级联<span class="_ _0"> </span><span class="ff2">H<span class="_ _1"> </span></span>桥多电平拓扑结构<span class="ff3">，</span>并通过开环和闭环仿真对其性能进行</div><div class="t m0 x1 h2 y19 ff1 fs0 fc0 sc0 ls0 ws0">了评估<span class="ff4">。</span>仿真结果表明<span class="ff3">，</span>该拓扑结构具有较好的输出波形质量和电能转换效率<span class="ff4">。</span>本文的仿真过程中<span class="ff3">，</span></div><div class="t m0 x1 h2 y1a ff1 fs0 fc0 sc0 ls0 ws0">控制与采样环节均采用手工搭建<span class="ff3">，</span>没有采用<span class="_ _0"> </span><span class="ff2">Matlab<span class="_ _1"> </span></span>自带的模块<span class="ff3">，</span>以保证仿真结果的准确性和可靠性</div><div class="t m0 x1 h2 y1b ff4 fs0 fc0 sc0 ls0 ws0">。<span class="ff1">希望本文的研究对于离网三相逆变器的设计和优化提供一定的参考价值</span>。</div><div class="t m0 x1 h2 y1c ff1 fs0 fc0 sc0 ls0 ws0">参考文献<span class="ff3">：</span></div><div class="t m0 x1 h2 y1d ff2 fs0 fc0 sc0 ls0 ws0">[<span class="ff1">无</span>]</div></div><div class="pi" data-data='{"ctm":[1.568627,0.000000,0.000000,1.568627,0.000000,0.000000]}'></div></div>