Modeling And Performance Analysis Of Power System Stabilizer PSS4B

With the rapid development of modern power systems, large interconnected power grid, heavy-duty, long-distance transmission and universal application of fast excitation device has become its remarkable characteristics, these factors were reduced to varying degrees damping system, thereby increasing the system the possibility of low-frequency oscillations. As the most important measures currently to suppress low-frequency oscillations, power system stabilizer (PSS:Power System Stabilizer) have been widely used all over the world. However, the largely used PSS is not perfect because of its suppression in the model and the principles of respect, there is the problem of ineffective suppression, has been difficult to meet the requirements of modern interconnected power systems, the new power system stabilizer PSS4B with superior performance have come into being, which is important to ensure the stable operation of the power system.Firstly, this paper describes the theoretical basis of two parts associated with PSS, one of which is the power system low frequency oscillation, which focuses on the mechanism and disincentives; second is synchronous generator excitation control system, after a brief introduction to the role of the excitation system and its mathematical model, a mathematical model of the single machine infinite bus system was based on focusing on the theoretical analysis of the relationship between the generator excitation control system and power system low frequency oscillations. Secondly, by comparison with a variety of common PSS, illustrating the superiority of the PSS4B; then detailed the standard mathematical models given by IEEE, analyzed the characteristics of the speed transducers and each band using frequency-domain methods; and elaborated a commonly used parameter setting method, each of the band coming PSS4B set to form a symmetrical band-pass filter, thereby reducing the need for tuning of the final number of parameters. For the characteristics of PSS4B in suppressing power oscillation by three bands respectively, the paper compares the characteristics of the three bands, three sets of parameters by analyzing the impact of change on PSS4B band gain performance. Finally, based on MATLAB/Simulink environment, the simulation model of single machine infinite bus system and four-machine two-area system were established, by setting different faults and disturbances respectively, three systems operating mode simulation results of non-PSS, the installation of PSS2B and PSS4B were compared, analyzed and summarized the performance of PSS4B in suppressing power system oscillation.Simulation results show that in the case of installation PSS4B, the oscillation amplitude of the system provided in the various disturbances and faults can be more remarkably small, and the oscillation frequency is less able to quickly reach a steady state, the oscillation suppression better than PSS2B, shows its own characteristics and advantages. This study for the new power system stabilizer PSS4B has a certain reference value in our industry and further applications.