Research On Key Theory And Technology Of Emergency Response For Large-scale Blackouts

The Occurrence and disposal process of a series of large-scale blackouts at home and abroad revealed some insufficiencies in the traditional accident management of governments and electric power industry when exposed to power system disasters,thus the emergency management possessing more systematic vision has gradually been introduced into the management mode of power system.However,as the emergency management discipline is quite novel and complicated,there is still much work to do in combining the philosophy and theory framework of emergency management and field emergency response technologies with electric power industry.Up to now,when it comes to predicting,responding,and restoring those system-level emergencies in practical electric power system,there is still insufficiency in the guide of valid thories and technologies.According to the practical situation of electric power system,the achievements of system theory and general emergency response theory were applied to electric power system in this thesis and the model of theory framework for the emergency management of large-scale blackouts was built in critical thinking.Through the analysis of the subjects,contents,relationships and environment of emergency management of electric power industry,the theoretical model identifies the objects,stages and contents of emergency management of electric power system.Based on this model and the ideas of measurable emergency response of electric power system,some issues of the key theory and technology were abstracted to support the emergency management of large-scale blackouts.The optimal model of transmission system restoration determines the quality of large-scale blackouts emergency response.In this thesis the objective function including the restoration time and the quantity of restored demand shows the prime goals of electric power system emergency management,and the constraint conditions for system restoration consist of network topology,operating characteristics and its degree of soundness.By the model formed by Petri network with time factor,optimal objects and related constraint conditions are preferable in consideration.Furthermore,this model could consider more easily the important non-electrical processes for restoration decisions in large-scale blackouts emergency response.The preparation and dispatch of resources are related to the cost and efficiency of electric power system emergency management.Two classes of optimal principle of resources were proposed in this thesis,and then the traditional concepts of demand importance degree were extended to some new meanings according to the goals of emergency management.As an example,an optimal model for mobile emergency generators,based on the principles and concepts in this thesis,was constructed and solved;the results indicated that this methodology possesses better practical value.The excellent estimation of large-scale blackouts need consider the impact of numerous risk sources.Based on the quantity index proposed in this thesis,monte-carlo method together with the risk resources of natural disaster and device failure was carried out to evaluate the size of possible blackouts.In order to improve the accuracy of simulations,cascading load transfer,and hidden failure of relay and stability of generators which are important to the occurrence of large-scale blackouts were involved in the simulation.The results of the adopted example indicated that this methodology could be applied to validate the proposed operation plan of electric power system.