Cascading failure simulation method considering actual operating characteristics of power grid dispatcher

Abstract

The present invention discloses a cascading failure model for considering the actual operation characteristics of power system dispatcher, which includes the following steps: (1) setting an upper limit of the number of simulation days of cascading failures (img file='2014106542441100004dest_path_image 001. TIF' wi='32' he='24' / ), a branch overloading load rate threshold value (img file='107861dest_path_image002. TIF' wi='42' he='28' / ); setting up normal conditions of AC power flow of each node in a system to be: the active power injection of PQ and PV nodes (img file='dest_path_image004. TIF' wi='48' he='31' / ), the reactive power injection (img file='962684dest_path_image004. TIF' wi='42' he='26' / ), and voltage (img file='dest_path_image005. TIF' wi='40' he='24' / ), wherein, (img file='178640dest_path_image006. TIF' wi='13' he='19' / ) is the node number; (2) initializing the number of days of the cascading failure (img file='dest_path_image007. TIF' wi='40' he='23' / ); (3) simulating the (img file='573849dest_path_image008. TIF' wi='15' he='16' / )-th cascading failure process; (4) (img file='dest_path_image009. TIF' wi='62' he='16' / ); and (5) executing step (3) if (img file='325904dest_path_image010. TIF' wi='57' he='24' / ), otherwise step ends. The cascading failure model introduces and considers adjustments and simulations of the actual power system dispatcher in a cascading failure model, so that the cascading failure simulation reflects the interaction characteristics of a power system cascading failure process and the dispatcher, which can more accurately reflect the development characteristics of the cascading failure, and improve the practicability of the cascading failure model.

Description

technical field [0001] The invention relates to the field of power system cascading failure simulation and risk assessment, in particular to a cascading failure simulation method considering the actual operation characteristics of a power grid dispatcher. Background technique [0002] The power system is a dynamic and complex large-scale nonlinear system. As the scale of the power system becomes larger and the load demand continues to increase, it becomes more and more difficult to ensure the safe and stable operation of the power grid. In recent years, there have been many cascading failures of power systems caused by self-accidents and external disturbances all over the world, leading to large-scale power outages and causing serious social and economic losses. [0003] In order to assess the risk of power system cascading failures and study the development mechanism of cascading failures, it is necessary to conduct reasonable and efficient simulation of power system cascad...

AI Technical Summary

Problems solved by technology

The traditional cascading failure model is often established as an optimal power flow model, but in the actual system, it is difficult for the dispatcher to eliminate all overloads in the way of the optimal power flow model, and it is often done through experience or local gradual adjustment. Modification of system state

Actual dispatcher operations will have limitations in adjustment speed and accuracy, which may cause cascading failures to continue to develop, and the use of optimal power flow models to simulate dispatcher operations may overestimate the adjustment ability of dispatchers, thus making cascading failures risk assessment The results are biased

In addition, the optimal power flow under the AC power flow model may not converge or fall into a local optimal solution due to problems such as convergence, nonlinearity, and non-convexity, resulting in deviations due to calculation reasons, which affect the rationality of cascading failure simulation. sex

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