Intelligent distributed feeder automation system is gradually favored by users because it does not depend on the global information of master station or substation, handles faults at one time, has good adaptability to the changes of distribution lines and is easy to maintain. The Technical Principles for Pilot Construction and Transformation of Distribution Automation and the Technical Guidelines for Distribution Automation formulated by State Grid Corporation in 2009 have taken intelligent distributed distribution automation system as the main form. Many experts and scholars have also proposed various intelligent distributed FA system solutions.
Implementation principle of 1
Intelligent distributed FA system means that when the distribution network fails, it can isolate the fault area through the mutual communication, protection coordination or time sequence coordination of terminals without being controlled by the distribution master station or the distribution electronic station, restore the power supply to the non-fault area, and report the treatment process and results. Different models of FA are not exactly the same in specific implementation principle, configuration and functional characteristics. In this paper, in addition to the traditional terminals such as feeder terminal (FTU), distribution transformer terminal (TTU) and distribution electronic station, a new control terminal-FA controller is proposed, that is, by collecting the information of the corresponding terminals (protection, FTU and TTU), point-to-point communication with neighboring FA controllers is realized, and the control algorithm of intelligent distributed FA system is realized. In practical application, the function of FA controller can be integrated into the traditional control terminal.
2 structural configuration
The intelligent distributed FA system adopts the Ethernet structure supporting point-to-point communication, and all kinds of intelligent distributed FA modes need to establish an IP-based communication network, such as Ethernet passive optical network (EPON) or industrial Ethernet. However, due to the different distribution granularity of these patterns, the configuration is also very different.
3 functional characteristics
Although these modes finally realize FA, their functional characteristics in practical applications are quite different due to their different principles and configurations.
The transformation, expansion and daily maintenance of distribution network are frequent, which requires the FA function of each distribution ring network to operate independently and not affect each other. If a ring network needs to be rebuilt or overhauled, it is only necessary to stop the f a function of this ring network during the work, regardless of the impact on other ring networks. This is also the biggest advantage of intelligent distributed FA system compared with centralized FA system. Substation-level FA system may involve multiple ring networks, so the interaction between multiple ring networks from the same substation is inevitable. Other modes are completely independent in feeder layer, which is superior to substation layer.
4 Model design and extension based on IIEC+0850 According to the modeling idea of 6 1850, the intelligent distributed FA system consists of related IED devices distributed on the distribution network. Each IED should contain one or more server objects, each server object contains at least one ld object, and each LD object contains at least three LNs: LLN0, LPDH and other application LNs. These LNs combined into an LD usually have some common characteristics.
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