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Smart substation and communication technology have a tremendous development, making the grid to coordinate and optimize a wide range of data possible, thus providing a higher level of centralization foundation for the protection and control functions. Therefore, the direction of future's protection is based on the high-performance computer technology and advanced communication networks. To this end,...
This paper presents an integrated PMU and protection scheme for power systems. The scheme integrates local and wide area control and protection systems by implementing the WAMS function and substation protections into one system to identify the overload caused by flow transfer from isolation of main trunk line. This integrated system mainly consists of three major components: local interface unit...
The transient traveling wave is mostly used in the areas of protections, fault line selections and fault locations due to its good characteristics of immunity to power swing, fault resistant, and CT saturations etc. The usage of transient travelling wave should rely on the real-time communications of SAV data, which produce the heavy load to the process bus in the digital substation. In response to...
This paper presents a scheme to perform the message sharing of the Integrated Protection for power system. The concept of integrated protection is introduced, in which data and message allover the substation even the whole power system can be obtained. Software of the integrated protection is designed to achieve the message sharing goal. As the basic unit in the software program, every thread stands...
This paper presents an integrated PMU and protection scheme for power systems. The scheme integrates local and wide area control and protection systems by implementing the WAMS function and substation protections into one system to identify the overload caused by flow transfer from isolation of main trunk line. This integrated system mainly consists of three major components: local interface unit...
The paper studies distribution network with comprehensive micro-grid systems with an aim to design an advanced protection and control scheme. The proposed integrated protection and control (IPC) unit, interfacing to the substation measurement devices and micro-grid components through a substation optical Ethernet, is responsible for the protection of the distribution substation and control of its...
Non Conventional Instrument Transformer (NCIT) and IEC 61850 are crucial technologies in digital substations. But they bring some new uncertainties to protection IEDs, especially the time synchronization issue in current differential protection. The paper analyzes the time delay of transferring sampled values from NCIT to current differential relay in NCIT and IEC61850 based digital substation, then...
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