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《Proceedings of the CSEE》 2009-34
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Power System Frequency Response Analysis Based on the Direct Current Loadflow

LI Chang-gang1, LIU Yu-tian1, ZHANG Heng-xu1, ZHUANG Kan-qin2, CAO Lu2, HUANG Zhi-long2 (1. School of Electrical Engineering, Shandong University, Ji’nan 250061, Shandong Province, China; 2. East China Grid Company Limited, Huangpu District, Shanghai 200002, China)  
Frequency is a crucial index in the power system. The essential cause of frequency deviation is the imbalance of active power. Conventional frequency response analysis methods, e.g. full-state analysis, average system frequency model (ASF) and system frequency response model (SFR), are summarized, and a new direct-current-loadflow-based power system frequency response analysis method (DFR) is proposed. The DFR model neglects the dynamic impact imposed by reactive power-voltage on active power-frequency response. It is presumed that terminal voltages are constant. The dynamic models of generating units are simplified properly. Direct current loadflow is utilized to consider the influence of the network approximately. Simulation results of two test systems show that the DFR model can reflect the dynamics of active power-frequency with high accuracy and less computation load. The DFR model can provide the dynamic information of frequency and that of active power. It can be used for the fast frequency response analysis and contingency screening of the active power perturbation.
【Fund】: 国家自然科学基金项目(50807031);; 国家电网公司科技项目(SGKJ[2007]139)~~
【CateGory Index】: TM711
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