Interconnected power grid cascading fault risk assessment and alarming method considering communication vulnerability degrees

Abstract

The invention provides an interconnected power grid cascading fault risk assessment and alarming method considering communication vulnerability degrees. Unified empirical extreme values are constructed separately for the sending delay, propagation delay, queue delay and link utilization rate of communication links; normalization processing, zero suppression processing and equal weight addition areperformed, so that the vulnerability degrees of the communication links of the same standards under different time cross sections are obtained; and the vulnerability degrees of communication nodes are constructed through using the node degree-based performance vulnerability degrees, service routing matrix-based topological vulnerability degrees, and business criticality degrees of the communication nodes. With the communication vulnerability degrees are considered, the outage probability model of branches at all levels of an interconnected power grid is established; load loss quantities, voltage fluctuation degrees, average communication link utilization rates and communication unobservable rates are defined as the consequence indicators of cascading fault paths; and the cascading fault paths are sorted and assessed, and a variety of alarms are given out. According to the interconnected power grid cascading fault risk assessment and alarming method considering communication vulnerability degrees of the invention, power risk assessment and communication vulnerability are combined together, so that the fault analysis and control of an interconnected power grid wide-area measurementand control system can be more comprehensive and reasonable.

Description

technical field [0001] The invention relates to the field of operation analysis of interconnected grids, in particular to a risk assessment and alarm method for cascading failures of interconnected grids considering communication vulnerability. Background technique [0002] In recent years, there have been frequent blackouts at home and abroad caused by cascading failures of power systems, which have had a bad impact on national economic and social development. The traditional analysis of cascading failures mostly starts from the operating state of the power system, and studies the development mechanism of cascading failures based on the theory of complex networks and self-organized criticality. However, the vulnerability of the communication network has relatively little consideration for the risks brought by the operation of the power system. The modern power system is a CPS (Cyber ​​Physical System) that integrates the power network and the communication network. Therefor...

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Problems solved by technology

The article [Guo Jing. Vulnerability Analysis of Electric Power Communication Network Based on Complex Network Theory. North China Electric Power University (Hebei) Master’s Degree Thesis, 2010] based on complex network theory, evaluates the topology vulnerability and physical vulnerability of communication network, but the communication chain Real-time performance metrics of road and communication nodes are not discussed

The second is to establish a CPS co-simulation model to study the development mechanism of cascading faults in the interconnected grid under communication faults. , 2015, 41(10): 3464-3469] established a CPS simulation model to discuss the impact of the coupling mode and strength of the system on the vulnerability of the interconnected grid, but treated all kinds of power services transmitted by the communication network uniformly, and did not discuss their importance. Spend

Although there are some methods for cascading failure analysis models and risk assessment methods, the risk assessment methods for power system cascading failure paths considering the vulnerability of communication networks are not deep enough

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