PLC-Based Realization Of The Optimized Relay Protection And Monitoring System In Power Supply And Distribution System

Targeting at the improvement and optimization of the deficiencies of traditional over-current protection, multi-agent system is applied in multi-layer relay protection to improve its fast response. Additionally, the prevalence of unattended power supply and distribution system calls for the rational configuration of integrated automation system. The thesis explores the design of backup power automatic switching based on reliable logics and the specific object-oriented RTU.The paper firstly builds a multi-layer protection model in MATLAB, and conducts simulation based on traditional protection mechanism and the multi-agent-based protection mechanism respectively. Meanwhile, the essence of the optimization and upgrade of the over-current protection strategy is illustrated in the paper. Namely, the strategy is dramatically changed from passive time-limit-based mode to positive protection strategy exchange through multi-layer communication. The performance comparison indicates that the multi-agent-based protection can effectively shorten the overlong time limit. On the basis of current-detection multi-agent-based relay protection, low-voltage lockout is installed in the detection mechanism to increase sensitivity. Secondly, the comprehensive utilization of the automatic equipments is capable of effectively elevating the self-control capabilities in power supply and distribution system, and it also serves as the fundamentals in realization of the unattended substations. Along with ever-increasing load scale and higher power supply reliability, the thesis conducts the analytical research of the self-adaptive bus-bar coupler/line-type compound backup power automatic switching which proves its logic correctness and practicability.Proven the practicability of above-mentioned strategies, the thesis elaborates on the advantages of CAN-based communication network in small and medium-sized factories and enterprises while comparing with the traditional serial communication. Considering the specific condition of power supply and distribution system of Fengrui fluoride industry, the thesis carries on feasibility analysis on CAN-based multi-agent-based over-current protection and integrated automation system. The thesis establishes the CAN-based communication network by B&R PLC: including the software programming and corresponding hardware debugging of microcomputer-based multi-agent-based protection. Meanwhile, the paper achieves the microcomputer-based backup power automatic switching techniques by using PLC, realizing the expected functions and improving the automation system.Moreover, object-oriented monitoring system can be highly efficient when it comes to the power supply and distribution system management. To realize four-remote-control system in unattended power supply and distribution system, the thesis uses WinCC software and design a HCI monitoring system in accordance with specific engineering requirements by considering the specific projects’ background.