Intelligent substation process layer network modeling method based on OPNET

Abstract

The invention discloses an intelligent substation process layer network modeling method based on OPNET. The method comprises following steps of building simulation models of various IEDs (Intelligent Electronic Device) of an intelligent substation in an OPNET environment, wherein the step of building the simulation models comprises building a combined unit simulation model, building an intelligent terminal simulation model, building a protection device simulation model and building a measuring and control device simulation device; using random numbers satisfying a distribution rule to simulate the data streams in an intelligent substation process layer network; and according to the built IED simulation models, through adoption of link connection of 100M bandwidth, building the intelligent substation process layer network with a set topological structure. Through adoption of the intelligent substation network model built by the method as a platform, indexes such as transmission delay, jitter and a packet loss rate of various data messages can be clearly and visually inspected; whether the indexes satisfy the IEC61850 standard or not is evaluated; and new ideals are provided for the designing and maintaining work of the intelligent substation network.

Description

technical field [0001] The invention relates to a modeling method of a process layer network in an intelligent substation, which constructs a complete process layer network on the basis of establishing various types of intelligent equipment, and belongs to the technical field of electric power system relay protection. Background technique [0002] The intelligent substation based on IEC61850, due to the construction of a networked information transmission and sharing platform, enables system applications such as relay protection, monitoring, and remote operation to be realized. The network in the smart substation is an information exchange channel between IEDs. Whether the network function is perfect and the performance indicators meet the requirements will directly affect the realization of various application functions in the substation. Therefore, the analysis and evaluation of network performance is very necessary. Considering the complexity of the communication in the s...

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Problems solved by technology

The literature "Huang Minghui, Shao Xiangchao, etc. Modeling and Simulation of Relay Protection for Smart Substation Based on OPNET [J]. Electric Power Automation Equipment, 2013, 33(5): 144-149." Proposed the realization of relay protection based on process layer network Process modeling, but does not take into account the impact of the network environment on data transmission performance, and the modeling of each IED only calls the three-layer node model ethernet_station of OPNET, which is different from the on-site bus differential protection and transformer protection structure

Analysis of the literature "Chen Zhiguang, Zhang Yanxu, etc. Substation process-level network-specific communication service mapping (SCSM) and its impact on real-time performance [J]. Power System Protection and Control, 2012,40(21):96-101." It is also developed based on OPNET's own ethernet_station model, which cannot accurately simulate the on-site IED

Therefore, so far, there is still a lack of a modeling method for the process layer network that conforms to field engineering practices, which affects the accurate evaluation of the performance of the process layer network.

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