PLC control system and method for dual power supply and communication of speed regulator hydraulic system

Abstract

The invention discloses a PLC control system and method for dual power supply and communication of a speed regulator hydraulic system. The PLC control system comprises a PLC main station A, a PLC mainstation B and a substation C, and the communication module of the substation C is connected and communicated with the communication module of the PLC master station through a double-channel coaxial cable, and uploads data to the CPU module of the master station in real time. And the touch screen HMI is in communication connection with the CPU module of the PLC master station through the concentrator by taking the Ethernet as a transmission medium, so that real-time data exchange between the touch screen HMI and the PLC master station is realized. And redundant communication between the masterstation and the PC is realized. And the PLC main station A and the PLC main station B are in communication connection through an optical fiber. According to the system, dual PLC control of a redundant power supply and communication is adopted, so that the system is not influenced by a local single fault during operation, and online maintenance can be realized; Meanwhile, normal operation of the system is not influenced during offline repair of fault components, so that the purposes of improving the reliability of the system and reducing the failure rate can be achieved.

Description

technical field [0001] The invention relates to the technical field of hydraulic system control of a governor of a water turbine, in particular to a PLC control system and a control method with dual power supplies and communications for the hydraulic system of a governor. Background technique [0002] The hydraulic system of the turbine governor plays a very important role in the operation of the unit. It can not only accept remote operation instructions, including starting and stopping the hydraulic system, but also monitor its own operating parameters, including the liquid level and pressure of the pressure oil tank, return Oil tank liquid level, oil pump and combination valve status, pipeline pressure and oil pump outlet pressure, etc. Therefore, the stability and reliability of the control system are put forward high requirements. And there are following drawbacks in the field control system in the prior art: [0003] 1: The communication structure, PLC module, CPU, an...

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Problems solved by technology

[0003] 1: The communication structure, PLC module, CPU, and power supply problems adopted by the on-site control system may cause the on-site PLC to interrupt the control of the on-site equipment, thus greatly reducing the reliability of the PLC control system

[0004] 2: The communication module of the existing control system uses a single coaxial cable to communicate with the substation. When the coaxial cable fails and the communication is interrupted, the current active CPU system reports a hot standby offline fault and disconnects the data communication with the HMI touch screen at the same time , resulting in the disconnection of the communication link with the PC, causing the HMI to fail to update data in time

[0005] 3: The existing control system uses a single power supply module for power supply, which cannot provide redundant power supply. When the power supply module of the main station of the PLC control system or the power supply module of the substation fails, the power supply of the entire main station or substation disappears, and the corresponding PLC The system is out of control, and there are serious equipment hidden dangers

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