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《Electric Power Automation Equipment》 2007-09
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Grid-based PFR dynamic modeling and its simulation

DU Liang1,2,LIU Jun-yong1,XIAO Lan2,LEI Xia1(1.Sichuan University,Chengdu 610065,China;2.Sichuan Electric Vocational and Technical College,Chengdu 610072,China)  
Traditional PFR(Primary Frequency Regulation) model ignores the constraints of power network and main steam pressure of boiler,which supposes the relation between generator power output and frequency to be linear by neglecting the influence of main steam pressure on power output.Improved PFR dynamic model is established based on real power grid,which fully considers the cooperative and restrictive relationship among boiler,turbine,load and grid,as well as the nonlinear relation between generator power output and frequency.It can be used to analyze the contribution of each element to frequency stability,which embodies the comprehensive PFR ability of generator,load and grid.With IEEE 30-bus test system,the influence of grid,boiler and their constraints on PFR are studied and the frequency response to transmission line trip is simulated.The conclusions are:when the generator operates at upper limit or there are generators not included in PFR,the system PFR ability will be decreased.SO(System Operator) should supervise PFR service properly,enhance parameter management,dispatch power flow rationally and avoid the operation of generator at upper limit to ensure the release of PFR reserve when needed to suppress frequency deviation after disturbance.When frequency deviation happens,SO should supervise SFR(Second Frequency Regulation) properly to bring frequency back to base point and renew the whole system PFR ability as soon as possible.
【Fund】: 国家重点基础研究发展计划专项资助项目(973项目)(2004CB217905)~~
【CateGory Index】: TM76;TM743
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