Research On Optimized Design And Allocation Method For Power System Stabilizer

The low frequency oscillation is a key issue which limits the transmission ability of large interconnected power system. Research on the restraining measures of the low frequency oscillation is of a very vital significance to guarantee the security and stability operation of power system. Power System Stabilizer (PSS) is widely applied in power systems as an effective measure to damping the low frequency oscillation. The control effectiveness of PSS is fundamentally determined by sound design of its parameters and rational allocation in the power system.On the basis of studying the transfer function and phase characteristic of typical excitation systems, a model of the OMIB system detailed considered various kinds of excitation system model is developed. On the foundation of analysing the traits of common input signal of PSS, Type Four PSS in the model library of Power System Analysis Software Package (PSASP), with the integral of accelerating power as input signal are chosed as the PSS model main concerned.A study on the design approach based on the phase compensation principle is carried out. The conventional phase compensation method has two traits. The one is that this method is difficult of take multi-mode of oscillation into account. The other one is setting reasonable gain of PSS is not easy. As a further study of the classical phase compensation method for PSS design, a technique for parameters optimization taking several oscillation modes into consideration based on genetic algorithms is studied.The role of the phase compensation parameters and the gain of PSS played in the control effectiveness are researched in-depth. It is showed that pole placement can be carried out by adjusting the gain and the parameters of PSS. The linear optimal control theory is used to design PSS for a network.After the physical implications of participation factor and eigen-value sensitivity is discussed, a PSS allocation method which comprehensively utilized these two indexes is proposed, and then PSSs are allocated for a practical grid using this method.A Graphical User Interface (GUI) is developed and applied for the PSS designing. The simulation results on the multi-machine power system demonstrate the effectiveness of PSS design and allocation method proposed by this thesis.