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target="_blank">技术中?/a> >> <a href="/Article/ArticleList32/" target="_blank">电气百科</a> >> <span>正文</span></div> <!-- main_content begin--> <div id="dsm30mws" class="maincontent"> <!-- left begin --> <div id="dsm30mws" class="news_left"> <div id="dsm30mws" class="brand_news_details"> <h1>电气百科:LS变频器SV008IG5A-4的控制方?/h1><table style="border-bottom:1px dotted #e4e4e4;" align="center"><tr><td><div id="dsm30mws" class="news_mes">文章来源:【互联网?作者:??点击?span id="HitNum"></span>?时间?span id="dTime">2019/7/10 16:50:11</span><input type="hidden" id="ID" value="100899724"/><input type="hidden" id="TypeID" value="2"/></div> </td> <td><div id="ckepop"></div></td></tr></table><div id="Content" style="display:none;">[电气百科:LS变频器SV008IG5A-4的控制方式]:变频器是应用变频技术与微电子技术,通过改变电机工作电源频率方式来控制交流电动机的电力控制设备。变频器主要由整流(交流变直流)、滤波、逆变(直流变交流)、制动单元、驱动单元、检测单元微处理单元等组成。变...</div><div id="dsm30mws" class="brand_news_con"><p style="text-indent:2em;">ݿ-ݿѯ 变频器是应用变频技术与微电子技术,通过改变电机工作电源频率方式来控制交流电动机的电力控制设备?</p> <p style="text-indent:2em;">ݿ-ݿѯ 变频器主要由整流(交流变直流)、滤波、逆变(直流变交流)、制动单元、驱动单元、检测单元微处理单元等组成。变频器靠内部IGBT的开断来调整输出电源的电压和频率,根据电机的实际需要来提供其所需要的电源电压,进而达到节能、调速的目的,另外,变频器还有很多的保护功能,如过流、过压、过载保护等等。随着工业自动化程度的不断提高,变频器也得到了非常广泛的应用?</p> <p style="text-indent:2em;"> 控制方式 </p> <p style="text-indent:2em;"> 低压通用变频输出电压?80?50V,输出功率为0.75?00kW,工作频率为0?00Hz,它的主电路都采用交—直—交电路。其控制方式经历了以下四代?</p> <p style="text-indent:2em;"> 第一?</p> <p style="text-indent:2em;">ݿ-ݿѯ 1U/f=C的正弦脉宽调?SPWM)控制方式?</p> <p style="text-indent:2em;"> 其特点是控制电路结构简单、成本较低,机械特性硬度也较好,能够满足一般传动的平滑调速要求,已在产业的各个领域得到广泛应用。但是,这种控制方式在低频时,由于输出电压较低,转矩受定子电阻压降的影响比较显著,使输出最大转矩减小。另外,其机械特性终究没有直流电动机硬,动态转矩能力和静态调速性能都还不尽如人意,且系统性能不高、控制曲线会随负载的变化而变化,转矩响应慢、电机转矩利用率不高,低速时因定子电阻和逆变器死区效应的存在而性能下降,稳定性变差等。因此人们又研究出矢量控制变频调速?</p> <p style="text-indent:2em;"> 第二?</p> <p style="text-indent:2em;">ݿ-ݿѯ 电压空间矢量(SVPWM)控制方式?</p> <p style="text-indent:2em;"> 它是以三相波形整体生成效果为前提,以逼近电机气隙的理想圆形旋转磁场轨迹为目的,一次生成三相调制波形,以内切多边形逼近圆的方式进行控制的。经实践使用后又有所改进,即引入频率补偿,能消除速度控制的误差;通过反馈估算磁链幅值,消除低速时定子电阻的影响;将输出电压、电流闭环,以提高动态的精度和稳定度。但控制电路环节较多,且没有引入转矩的调节,所以系统性能没有得到根本改善?</p> <p style="text-indent:2em;"> 第三?</p> <p style="text-indent:2em;">ݿ-ݿѯ 矢量控制(VC)方式?</p> <p style="text-indent:2em;">ݿ-ݿѯ 矢量控制变频调速的做法是将异步电动机在三相坐标系下的定子电流Ia、Ib、Ic、通过三相-二相变换,等效成两相静止坐标系下的交流电流Ia1Ib1,再通过按转子磁场定向旋转变换,等效成同步旋转坐标系下的直流电流Im1、It1(Im1相当于直流电动机的励磁电流;It1相当于与转矩成正比的电枢电流),然后模仿直流电动机的控制方法,求得直流电动机的控制量,经过相应的坐标反变换,实现对异步电动机的控制。其实质是将交流电动机等效为直流电动机,分别对速度,磁场两个分量进行独立控制。通过控制转子磁链,然后分解定子电流而获得转矩和磁场两个分量,经坐标变换,实现正交或解耦控制。矢量控制方法的提出具有划时代的意义。然而在实际应用中,由于转子磁链难以准确观测,系统特性受电动机参数的影响较大,且在等效直流电动机控制过程中所用矢量旋转变换较复杂,使得实际的控制效果难以达到理想分析的结果?</p> <p style="text-indent:2em;"> 第四?</p> <p style="text-indent:2em;"> 直接转矩控制(DTC)方式?</p> <p style="text-indent:2em;"> 1985年,德国鲁尔大学的DePenbrock教授首次提出了直接转矩控制变频技术。该技术在很大程度上解决了上述矢量控制的不足,并以新颖的控制思想、简洁明了的系统结构、优良的动静态性能得到了迅速发展。该技术已成功地应用在电力机车牵引的大功率交流传动上?直接转矩控制直接在定子坐标系下分析交流电动机的数学模型,控制电动机的磁链和转矩。它不需要将交流电动机等效为直流电动机,因而省去了矢量旋转变换中的许多复杂计算;它不需要模仿直流电动机的控制,也不需要为解耦而简化交流电动机的数学模型?</p> <p style="text-indent:2em;"> 矩阵式交—交控制方式?</p> <p style="text-indent:2em;"> VVVF变频、矢量控制变频、直接转矩控制变频都是交—直—交变频中的一种。其共同缺点是输入功率因数低,谐波电流大,直流电路需要大的储能电容,再生能量又不能反馈回电网,即不能进行四象限运行。为此,矩阵式交—交变频应运而生。由于矩阵式交—交变频省去了中间直流环节,从而省去了体积大、价格贵的电解电容。它能实现功率因数为l,输入电流为正弦且能四象限运行,系统的功率密度大。该技术虽尚未成熟,但仍吸引着众多的学者深入研究。其实质不是间接的控制电流、磁链等量,而是把转矩直接作为被控制量来实现的。具体方法是?</p> <p style="text-indent:2em;">ݿ-ݿѯ 1、控制定子磁链引入定子磁链观测器,实现无速度传感器方式; </p> <p style="text-indent:2em;"> 2、自动识?ID)依靠精确的电机数学模型,对电机参数自动识别; </p> <p style="text-indent:2em;"> 3、算出实际值对应定子阻抗、互感、磁饱和因素、惯量等算出实际的转矩、定子磁链、转子速度进行实时控制?</p> <p style="text-indent:2em;"> 4、实现Band—Band控制按磁链和转矩的Band—Band控制产生PWM信号,对逆变器开关状态进行控制?</p> <p style="text-indent:2em;">ݿ-ݿѯ 矩阵式交—交变频具有快速的转矩响应(<2ms),很高的速度精度(±2%,无PG反馈),高转矩精度(<+3%);同时还具有较高的起动转矩及高转矩精度,尤其在低速时(包括0速度?,可输出150%?00%转矩?</p> <p style="text-indent:2em;"> VVC的控制原理: </p> <p style="text-indent:2em;"> VVC的控制原理是将矢量调制的原理应用于固定电压源PWM逆变器。这一控制建立在一个改善了的电机模型上,该电机模型较好的对负载和转差进行了补偿?</p> <p style="text-indent:2em;"> 因为有功和无功电流成分对于控制系统来说都是很重要的,控制电压矢量的角度可显著的改?-12HZ范围内的动态性能,而在标准的PWM U/F驱动?-10HZ范围一般都存在着问题?</p> <p style="text-indent:2em;"> 利用SFAVM?0°AVM原理来计算逆变器的开关模式,可使气隙转矩的脉动很小(与使用同步PWM的变频器相比)?</p> </div><div id="dsm30mws" class="meneame"><span class="disabled">< </span><span class="current">1</span> </div> <div id="dsm30mws" style="text-align: center;padding-top: 10px;"><img src="/images/code.jpg" alt="关注有惊?" /></div> <div id="dsm30mws" class="news_bot_mes">中国工业电器网:此内容转载于合作媒体或互联网其它网站,中国工业电器网登载此文出于传递更多信息之目的,并不意味着赞同其观点或证实其描述!</br>新闻、技术文章投稿QQ?28246603 邮箱:news@cnelc.com</div> <h2 class="related">相关阅读</h2> <ul class="related_con"> <li>· <a href="/text/32/190716/AD100899908_1.html" target="_blank">电气百科:普旭真空泵排齐滤芯的关键?/a></li><li>· 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