Research On Analyzing Model And Prevention & Emergency System For Power System Blackouts

In recent years,several big blackouts occurred in several foreign and domestic power grids.For instance,on August 14,2003,large portions of the Midwest and Northeast United States and Ontario,Canada experienced an electric power blackout;on July 1,2006,a blackout happened in Henan province,China;on November 4,2006,a blackout happened in the West Europe.This kind of blackout will cause extreme loss,and its occurring probability is relatively frequent,so it has become an outstanding threat to the stability of bulk power systems.The author hope to presents a systemic study on blackouts,The following are the main work:This paper summarize the typical blackout events at home and abroad in recent years and analyze the process of blackout and accident causes.The mechanism of cascading failures and simulation model is studied and analyzed in this paper,the cascading failures searching model and evaluation method for blackout risk are established in this paper.The main factors impelling the cascading propagation of failures in the develop phase are analyzed at length,a cascading failure searching method is established,which is based on revised ac power flow method and considers hidden failures in protection systems.This thesis selects out several important parameters and analyzes their impact on the risk of the cascading event by IEEE-RTS96 data.According to the analysis,several methods can be used to lower the risk.Technical measures for prevention of blackout are described systemically in this paper.The paper discusses the theory and technical method of security defense for power system briefly,discusses systemically the control measures for prevention of asynchronous,overload,frequency collapse and voltage collapse,introduces the implementation method for opening the electromagnetic loop and leveling & districting operation.The evaluation indices system for the emergency management to large-scale blackout is systematically proposed and established by this paper.The indices system is built upon the characteristics of large-scale blackout,following the general theory about emergency management and applying the thought of systems theory and methodology.The method of Fuzzy Analytic Hierarchy Process(FAHP) is introduced,the analytic hierarchy process is used to determine the weight of each index,then fuzzy comprehensive evaluation is performed hierarchically.The evaluation indices system for the emergency management to large-scale blackout is systematically proposed and established by this paper.The indices system is built upon the characteristics of large-scale blackout,following the general theory about emergency management and applying the thought of systems theory and methodology.The method of Fuzzy Analytic Hierarchy Process(FAHP) is introduced,the analytic hierarchy process is used to determine the weight of each index,then fuzzy comprehensive evaluation is performed hierarchically.