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《Transactions of China Electrotechnical Society》 2009-09
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Frequency Dynamics Analysis and Load Shedding Assessment Based on the Dynamic Simulation Trajectory of Interconnected Power System

Li Aimin Cai Zexiang (South China University of Technology Guangzhou 510640 China)  
As power system interconnection between utilities increased,the traditional method of frequency dynamics analysis based on the single-machine model no longer adapted to the modern power system. A method for frequency dynamics analysis and load shedding assessment is proposed in this paper, which maps the simulation trajectories in the multi-machine space to a single-machine space by using the center-of-inertia transform. This method not only takes advantage of numerical integral method,which is not limited by the model,but also uses the concept of uniform frequency of the single-machine model to compensates the shortage of numerical integral method effectively. The influences of different network structures, and operation modes on the frequency dynamics are analyzed. A new under frequency load shedding (UFLS) scheme is proposed which can not only meet the frequency security requirements of the entire network but also the one of the regional network. Finally,lots of simulation results are compared with the traditional scheme and show that the new method has much more adaptability.
【CateGory Index】: TM714
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【Citations】
Chinese Journal Full-text Database 6 Hits
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