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This paper describes a substation avalanche test system which is based on B code. The system supports simultaneous operation of multiple remote signaling and can ensure the synchronization and accuracy of time's movement. Using platform of ARM9 hardware and embedded operating systems, the system has lots of feature, such as high integration, small size and stable. The host computer can operate the...
Nowadays, the growing presence of distributed energy resources (DER) makes the management of the distribution grid more complex, thus requiring distributed monitoring and controlling capabilities. The deployment of locally distributed intelligent devices over a large area involves a high performance network infrastructure (typically based on heterogeneous communication technologies) in order to provide...
Time synchronization is the necessary technique to implement automation system in smart substations. It provides the accuracy time stamp mark used for data acquisition and used to analyze and deal with the power system fault. As a type of clock synchronization used in network with high precision, IEEE1588 is widespread applied recently in smart substations. This paper analyzes the reason of clock...
According to the characteristics of smart substation, this text discusses the test process, contents and methods of smart substation secondary system. The emphases and difficulties of the test are also discussed.
The future of electric power is smart grid, one of the key parts is smart substation. The Technical guide for smart substation is published by State Gird Corporation of China for the construction of smart substation and Tri-status measuring and control device which includes the steady state measure, transient state measure and dynamic state measure is presented. The uniformed source data with the...
With the development of digitization of substation, the future trend of on-line monitoring system of substation power equipment is adopting the IEC61850 standard to realize seamless communication. However, the change of distance and node make synchronization precission of samples transmission become a problem. An implementation method based on the IEEE1588 standard is proposed, by use of DP83640 Ethernet...
There is an increasing demand on accurate time synchronization for protection and control equipment for the electrical power supply system. Today, with the proliferation of Ethernet networks in the substation automation systems, mainly driven by other standards as IEC 61850, time distribution over these networks appears to be especially appealing. NTP was already specified in IEC 61850 as time distribution...
Wide-area monitoring (WAM) applications for power distribution rely on accurate global time synchronization. Furthermore, there is interest in replacing current time synchronization methods such as Inter Range Instrumentation Group (IRIG), with distributed time synchronization protocols that utilize the data communication lines eliminating the need for dedicated timing signals within the substation...
The traditional time synchronization algorithms based on the Network Time Protocol (NTP) obtain accurate time synchronization on the assumption that the round-trip delay is equal. A highly precise time synchronization method is preposed, which process the one-way delay in dynamic network. The implementation in the substation automation system(SAS) shows that the algorithm reduces network jitter, as...
With the development and research of digital substation, some digital substations are built in power grid. Time synchronization in digital substation is researched, and some kinds of time synchronization system applied in substation are introduced. Application of time synchronization system based on SNTP in Guangdong power gird is put forward. This testing system based on SOE(sequence of events) resolution...
The IEEE 1588 precision time protocol seems to be a promising way to handle synchronization requirements of tomorrow substation automation. However, one of the remaining issues is its lack of reliability in case of the loss of the GPS signal (e.g. due to atmospheric disturbances or failure of the GPS antenna) which would lead to the desynchronization of the devices inside a substation or between different...
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