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电(dian)力操纵电源体系在古代动力体系中据有首要的位置,首要用于发电厂、变电站中,作为直流机构、继电(dian)掩护(hu)、旌旗灯号、主动节制、变乱照明、仪器仪表和应急变乱负荷等的首要电源。其机能和品质间接干系到电网的宁静运转和装备的宁静。

本文经由过程对经常利用的均流方式的阐发和两种主动选主的均流方式的小旌旗灯号模子的建模阐发,挑选了主动选主的主从均流方式。接纳该均流方式可完成模块电源间的均流,进步均流环的呼应速率,完成模块电源并接洽统的冗余。利用均流集成节制芯片UC3902完成静态均流,并设想了基于主动选主的主从均流的节制电路,完成了体系的均流节制。

2 均流节制的根基道理

为了能(neng)使各(ge)(ge)电(dian)(dian)(dian)源(yuan)(yuan)均分(fen)负(fu)载电(dian)(dian)(dian)流(liu),起首(shou)须要深切阐发电(dian)(dian)(dian)源(yuan)(yuan)电(dian)(dian)(dian)流(liu)分(fen)派不(bu)均的(de)(de)机理(li),而后(hou)接纳响应的(de)(de)对(dui)策。多个电(dian)(dian)(dian)源(yuan)(yuan)并联后(hou)的(de)(de)环境如图(tu)1所示。一切电(dian)(dian)(dian)源(yuan)(yuan)输入毗连在(zai)一路(lu),是(shi)以它们的(de)(de)输入电(dian)(dian)(dian)压(ya)都(dou)是(shi)不(bu)异的(de)(de),但(dan)每一个电(dian)(dian)(dian)源(yuan)(yuan)的(de)(de)给定量、反应比(bi)例(li)系数略有(you)差别,再斟酌(zhuo)到运(yun)放的(de)(de)平衡电(dian)(dian)(dian)压(ya)也各(ge)(ge)不(bu)不(bu)异,是(shi)以各(ge)(ge)电(dian)(dian)(dian)源(yuan)(yuan)偏差旌(jing)旗灯(deng)号也各(ge)(ge)不(bu)不(bu)异(下角标k均表现(xian)第k个电(dian)(dian)(dian)源(yuan)(yuan))。各(ge)(ge)电(dian)(dian)(dian)源(yuan)(yuan)的(de)(de)电(dian)(dian)(dian)压(ya)调理(li)器凡(fan)是(shi)都(dou)接纳比(bi)例(li)-积(ji)分(fen)(PI)调理(li)器。

当各电(dian)(dian)源(yuan)(yuan)的(de)输入刚并联到一(yi)路时,有(you)的(de)电(dian)(dian)源(yuan)(yuan)偏差信(xin)为正,电(dian)(dian)压(ya)调(diao)理器正向积(ji)分(fen),开路电(dian)(dian)压(ya)进步(bu),输入电(dian)(dian)流增添;有(you)的(de)电(dian)(dian)源(yuan)(yuan)为负(fu),电(dian)(dian)压(ya)调(diao)理器反向积(ji)分(fen),开路电(dian)(dian)压(ya)下降(jiang),输入电(dian)(dian)流变(bian)小(xiao)。

当负(fu)载(zai)电(dian)(dian)(dian)(dian)流(liu)(liu)小于单台电(dian)(dian)(dian)(dian)源的最大限流(liu)(liu)值时,终究进入(ru)稳态后的环境(jing)是,有一台电(dian)(dian)(dian)(dian)源的为零,调(diao)理(li)器一般任(ren)务,而别(bie)的电(dian)(dian)(dian)(dian)源的为负(fu)值,调(diao)理(li)器处于上限饱和状况。全(quan)数的负(fu)载(zai)电(dian)(dian)(dian)(dian)流(liu)(liu)都由为零的点源承当,别(bie)的电(dian)(dian)(dian)(dian)源输入(ru)电(dian)(dian)(dian)(dian)流(liu)(liu)为零。

 

图1并联(lian)后的电源体系

 

当负(fu)载电(dian)(dian)(dian)(dian)流(liu)(liu)较大(da),跨越了(le)单台(tai)电(dian)(dian)(dian)(dian)源(yuan)(yuan)的(de)(de)最(zui)大(da)限(xian)(xian)流(liu)(liu)值(zhi),环(huan)境就略微(wei)庞杂一些(xie)。有(you)些(xie)电(dian)(dian)(dian)(dian)源(yuan)(yuan)的(de)(de)为(wei)(wei)正,有(you)些(xie)电(dian)(dian)(dian)(dian)源(yuan)(yuan) 为(wei)(wei)负(fu),最(zui)多有(you)一个电(dian)(dian)(dian)(dian)源(yuan)(yuan)为(wei)(wei)零(ling)。 为(wei)(wei)正的(de)(de)电(dian)(dian)(dian)(dian)源(yuan)(yuan)输入电(dian)(dian)(dian)(dian)流(liu)(liu)为(wei)(wei)最(zui)大(da)限(xian)(xian)流(liu)(liu)值(zhi), 为(wei)(wei)负(fu)的(de)(de)电(dian)(dian)(dian)(dian)源(yuan)(yuan)输入电(dian)(dian)(dian)(dian)流(liu)(liu)为(wei)(wei)零(ling), 为(wei)(wei)零(ling)的(de)(de)电(dian)(dian)(dian)(dian)源(yuan)(yuan)输入电(dian)(dian)(dian)(dian)流(liu)(liu)介于(yu)零(ling)和限(xian)(xian)流(liu)(liu)值(zhi)之间。一切(qie)的(de)(de)电(dian)(dian)(dian)(dian)源(yuan)(yuan)的(de)(de)输入电(dian)(dian)(dian)(dian)流(liu)(liu)和即是(shi)负(fu)载电(dian)(dian)(dian)(dian)流(liu)(liu)。

按照以(yi)(yi)上的(de)(de)(de)阐(chan)发(fa),电(dian)(dian)(dian)源并(bing)联后(hou)输(shu)(shu)(shu)入电(dian)(dian)(dian)流(liu)不(bu)相称(cheng)的(de)(de)(de)缘由是(shi),在输(shu)(shu)(shu)入电(dian)(dian)(dian)压(ya)不(bu)异的(de)(de)(de)前提下,电(dian)(dian)(dian)压(ya)调(diao)理器偏差旌(jing)(jing)旗灯(deng)号差别,这(zhei)反应(ying)了电(dian)(dian)(dian)路参数的(de)(de)(de)分离性(xing)。为了可以(yi)(yi)或许弥补这(zhei)类分离性(xing),使(shi)各电(dian)(dian)(dian)源的(de)(de)(de)输(shu)(shu)(shu)入电(dian)(dian)(dian)流(liu)相称(cheng),并(bing)且都(dou)即是(shi)零,必须(xu)接纳节制办法(fa)。是(shi)以(yi)(yi),并(bing)联运转(zhuan)均流(liu)节制的(de)(de)(de)根基(ji)道理便是(shi)经(jing)由过程检测模块的(de)(de)(de)输(shu)(shu)(shu)入电(dian)(dian)(dian)流(liu),判定它的(de)(de)(de)不(bu)均流(liu)水平,用这(zhei)个旌(jing)(jing)旗灯(deng)号去转(zhuan)变(bian)直流(liu)输(shu)(shu)(shu)入电(dian)(dian)(dian)压(ya)的(de)(de)(de)给定或反应(ying)的(de)(de)(de)量,使(shi)电(dian)(dian)(dian)压(ya)调(diao)理器偏差旌(jing)(jing)旗灯(deng)号为零和各模块电(dian)(dian)(dian)源电(dian)(dian)(dian)压(ya)调(diao)理器输(shu)(shu)(shu)入的(de)(de)(de)电(dian)(dian)(dian)流(liu)给定不(bu)异,以(yi)(yi)到达(da)节制均流(liu)的(de)(de)(de)目(mu)标。

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