| Summary: | 博士 === 國立臺灣海洋大學 === 電機工程學系 === 101 === Intelligent electric devices (IED) of protective relays provide not only protection functions, which are the primary task in the process of substation automation, but also communication and data connection. Although there is numerous protective relays in the substation, protective relays can neither achieve data interoperability nor transmit packet to SCADA (Supervisory Control And Data Acquisition) systems. Currently, a substation often uses several types of protective relays, so it is not easy to implement communication interfaces. This dissertation is to study IEC61850 (Communication Networks and Systems in Substations) communication protocol which has flexibility in data integration and application to overcome the dilemma of multitype protective relays by using GOOSE (Generic Object Oriented Substation Event) to implement data interoperability. For getting transmission time based on time synchronization, relays rely on GPS (Global Positioning System) and program configuration to obtain the time formula. The advantages of fast signals transmission is to simplify the process of hardwire control application to give better responses to overcome hardwiring complication. The study of this dissertation also demonstrates that SCADA can use one standard communication protocol to integrate various types of relays to have the efficiency of smart substations in power substations, and that protective relays can result in communication interaction based on IEC61850 GOOSE application to accomplish the performance of smart substations.
In this dissertation, we use three different types of protective relays, a GPS, a switch and a computer monitor combined as a demontration platform to attain the requirement of interoperability by revising Configuration IED Description (CID) programs in order to get transmission time by performing virtual communication channels. The test results reveal that IEC61850-GOOSE communication transmission time is faster than present communication modes. This dissertation also purposes five kinds of applications based on IEC61850-GOOSE fast transmission modes, such as breaker failure, high speed load shedding, power supply restoration, fast blocking between upstream and downstream and interlocking control scheme, which yield the changes in the hardwire modes and thus better responses of voltage, frequency and angle accordingly. It is concluded that protective relays can achieve communication interaction based on IEC61850 GOOSE message.
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