目前中海油的海上平台潜油电泵的地面控制设备变频器的控制方式广泛使用基于Profibus网络的主站-从站控制方式,通过网络中的中央控制柜来操控所有的变频器.由于是采用的串联方式,导致每个Profibus通讯节点对整个网络的影响很大,经常会因为震动、电磁干扰等原因导致的网络故障,致使平台大面积停机、停产.为了避免此类问题的发生,在每台变频器从站网络入口之处扩展一台PLC,用做主站指令确认与Modbus网络转换,通过实现Modbus与变频器通讯,避免了网络问题对变频器运行的影响,增强了系统运行的稳定性.%At present,the ESP(Electrical Submersible Pump) surface control equipment VSD (Variable Speed Drive)on CNOOC's offshore platform is widely controlled by the Master-Slave network based on the Profibus through a center control panel.The network is uses the serial connection mode,and each node of the Profibus network can impact the communication,often causing the large scale of well shutdown.In order to avoid the occurrence of such problem,each VSD expands a PLC (Programmable Logic Controller) in the VSD.used for confirming the master command and Modbus network conversion,PLC communicating with the VSD by Modbus,so avoids the influence for the VSD by the network fault and enhances the stability of the control system.
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