| With the rapid advancement of communication and computer network technologies,the management model of substations continues to improve,and their level of automation is quickly escalating.As a result,traditional substations are gradually being replaced by intelligent substations.These modern substations,powered by intelligent devices and the IEC61850 protocol,are capable of automatically collecting,measuring,and monitoring information,offering distinct advantages such as innovation,reliability,and environmental sustainability.Reliability,one of the most critical indicators of an intelligent substation,is key to ensuring stable operation of primary equipment.This is vital to reducing the failure rate of the power system and improving its overall reliability.Among these primary pieces of equipment,the optical fiber current transformer plays a significant role by effectively collecting current information within the intelligent substation.It is essential to monitor and maintain various state quantities,such as chassis temperature and humidity,inside this transformer to ensure stable operation.In the context of intelligent substations,the IEC61850 protocol serves as a bridge for communication between devices.The protocol’s Sampled Value(SV)message,capable of carrying large amounts of data,is widely used.Additionally,the Generic Object Oriented Substation Event(GOOSE)message is particularly suitable for conveying the state quantities of an optical fiber current transformer,due to its low latency,simplified structure,and unique retransmission mechanism.However,as intelligent substations are still evolving,discrepancies in hardware and software developments have resulted in a lack of specialized software systems tailored for handling GOOSE messages from optical fiber current transformers.To harness the full potential of these systems,it is crucial to develop an information system based on GOOSE messages and centered around optical fiber current transformers.Such a system will be capable of obtaining,integrating,analyzing,and processing internal state quantities of the transformers.It will also facilitate the local and remote display of processed state information,enabling information sharing and collaborative operations.This thesis encompasses the following main components:1.A detailed study of the internal state variables of optical fiber current transformers in intelligent substations is conducted using the information element method.This exploration aids in designing the system development platform.In light of the current research landscape both domestically and internationally,transmission characteristics,mapping methods,and frame structure of GOOSE messages are examined to acquire the internal state variables of the optical fiber current transformer.This process is followed by an analysis of the parameters and models of the information system.With Java as the development language,the server side is architected in layers using the Spring-Boot framework.The requirements of the optical fiber current transformer information system are analyzed,a layered structure based on the W model is established,culminating in the completion of the comprehensive system design.2.Based on the functional requirements of the information system,it is segmented into five modules:the capture module,parsing module,storage module,local visualization interface,and remote visualization interface.Each module operates independently to minimize interference and coupling,thereby enhancing system stability and portability.Functional implementation strategies are individually designed for each module,followed by their respective software development.The capture module leverages WinPcap for GOOSE message capture,the parsing module dissects the GOOSE message frame into three segments,the storage module constructs a database based on MySQL to store captured messages,and the Vue framework is used to develop the visualization interface.3.The functionality of the optical fiber current transformer information system is validated through performance testing and optimization in real-world application systems.All modules are integrated to construct a complete testing system.To validate the system’s functionality,a simulator is used to transmit GOOSE messages as a substitute for an actual optical fiber current transformer.The information system is then installed in a grid-based optical fiber current transformer system for overall functional verification,performance testing,and subsequent optimization.The aim of this thesis is to design and implement a software system capable of capturing,parsing,storing,monitoring,and visualizing data associated with the internal state variables of optical fiber current transformers,thereby facilitating information sharing and collaborative operation. |
