| 基于PLC控制的电机变频/工频同步切换 |
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| 引用本文： | 刘思,张加胜.基于PLC控制的电机变频/工频同步切换[J].电气自动化,2011,33(1):41-43. |
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| 作者姓名： | 刘思 张加胜 |
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| 作者单位： | 中国石油大学,华东,电气工程系,山东,东营,257061 |
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| 摘 要： | 研究了一种异步电机变频/工频同步切换的控制方法.设计出一种由鉴频鉴相控制、PI调节和作为压控振荡器的变频器构成的锁相同步切换控制方案.PLC保持对工频相位信号和变频器的输出相位信号进行实时地检测.当两信号频率一致且相位差在允许的误差范围内时,PLC控制与工频回路和变频回路相关的交流接触器动作,从而实现电机工频和变频电路...
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| 关 键 词： | 锁相同步切换 压频控制器 PLC 变频器 |
The Motor Synchronous Switching between the Inverter Power and Power-frequency Supply Based on PLC Control |
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| Liu Si,Zhang Jiasheng.The Motor Synchronous Switching between the Inverter Power and Power-frequency Supply Based on PLC Control[J].Electrical Automation,2011,33(1):41-43. |
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| Authors: | Liu Si Zhang Jiasheng |
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| Affiliation: | (China University of Petroleum,Dongying Shandong257061,China) |
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| Abstract: | This paper develops a synchronous switching method between variable frequency and power frequency for AC asynchronous motor.Based on the discussion in theory,the Phase-Locked Synchronous Switching Control Scheme is designed,which is consists of the frequency and phase discriminator,PI regulator and VCO(Voltage Controlled Oscillator)which is replaced by frequency converter.The PLC keeps real-time detection of the phase signals of the variable frequency and the power frequency,and when the phase displacement between variable frequency and power frequency is in the range of allowable error,the PLC controls contactor coil pull in or out between power frequency and variable frequency contactor,so the synchronous switching or non-impact switching is realized. |
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| Keywords: | PLC |
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