Modeling And Simulating Of Three Gorges Power Station And Its AC & DC Hybrid Transmission System

As the biggest power system in China and one of the biggest in the world. Three Gorges power system has the features of great unit, AC & DC hybrid transmission and flexible operation modes. Its operation characteristics and possible problems, such as power harmonic and system stability, are widely studied in the whole world.In this paper, the mathematic models of system components are analyzed and the simulation template of generator unit, transformer, and converter are constructed. Based on the mathematic models and simulation templates of system components, the systematic simulation model including Three Gorges power station and its AC & DC transmission hybrid system is established. The rationality of established simulation models is verified according to the theory or experiments. Some steady state operation modes and transient processes are simulated using established systematic simulation model. The power harmonic of system is calculated. According to the result of steady state, transient processes simulation and power harmonic calculation, the influence of power harmonic and transient processes on generators, transformers, communication lines and power system stability is analyzed. As one part of this paper, the frequency characteristics, parameter sensibility and power characteristics of AC & DC filters equipped in Three Gorges power system are analyzed. Some useful conclusion for design, manufacture and operation oi fillers is drawn.