MPM-B2153B-SJ74AA

MPM-B2153B-SJ74AA

MPM-B2153B-SJ74AA

MPM-B2153B-SJ74AA

 变频泵循环运行方式优点很多,但是实现起来却较复杂,关键问题是变频器输出切换问题。在非同步控制下,即变频器的频率和相位与共频电源的频率和相位不一致时,将水泵电动机从变频器供电切换到工频电网供电,将可能遇到很大的电流冲击。 

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        如图2所示,以第1台电机为例在KM1断开以后,定子绕组是开路的,不可能有励磁电流。而转子绕组是自成回路的,其电流有一个逐渐衰减的过程,它将产生一个逐渐衰减的直流磁场,而定子三相绕组将和此旋转的直流磁场相互切割,从而产生出相应的感应电动势,即电动机在切断电源以后,存在着一个处于非同步发电状态的电磁过渡过程。非同步发电状态不同于电动机的再生发电状态,电动机的再生发电状态是指定子绕组必须和电源相接,以得到励磁电流。而此处所述情况是电机已经脱离电源。 
        一般来说我们在工程实践应用中,总结出来的经验是在水泵脱离变频器后,等待一段时间(参数11-04),待电动机的反电动势降下来以后再接到工频电源。如果不等待切换,即KM2在闭合的瞬间,即在电动机的反电动势比较高时切换,会发生两种情况,①电源电压恰好与电动机定子绕组的电动势同相(因为转子的转速在不断下降,所以反电动势的周期略大于工频电压的周期),此时切换无附加的冲击电流。②若电动机的反电动势与工频电压的相位差正好为180度,则情况 糟糕,一般的异步电动机将流过额定电流10倍左右的电流,对供电电网和电动机会产生过大的电流冲击。 
3.2 问题对策 
        针对这种情况可以采用监频监相控制器,用来监视切换时变频器输出的频率和相位,当其于工频电源的频率和相位一致时,再完成水泵由变频器到电源的切换。使切换后电流大致等于电动机的额定电流,基本实现对生产和电网无任何影响的无扰动切换。目前多数变频器循环运行的供水方式多采用延长切换时间的方法,来避开相位不一致造成的电势叠加。这也就是参数11-04的意义。

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