Design And Implementation Of Power System Stabilizer PSS4B

With the accelerated pace of ultra-high voltage construction and grid interconnection, and the increasing proportion of clean energy, the grid structure becomes huge and complex, which not only improving the economy and reducing pollution, but also laying the security and stability threat. For a long time, low-frequency oscillation is an import factor threatening the stable operation of the power grid. In order to suppress the low-frequency oscillation, power system stabilizer(PSS) has been widely used at home and abroad, having good effects. However, the rapid development of the grid puts forward new requirements to PSS, that which can provide appropriate damp of overall low-frequency band, so the conventional PSS is getting limited. In view of this, it is of great significant to do research on multi-band power system stabilizer(Multi-PSS,PSS4B) which has wider working frequency band and adapts to multiple oscillation modes.Current research relevant PSS4 B at home and abroad mostly focus on the theory and simulation, with the study of dynamic simulation test and application having yet to be seen. Response to this situation, the article makes a detailed study on PSS4 B, which starting from its performance analysis, then carrying on the associated hardware and software design, finally verifying the validation of scheme and PSS4 B via the simulation and dynamic test.First of all, the article summarizes the research status of PSS, introducing the mechanism of low-frequency oscillation and the design principles of PSS, and highlights that PSS4 B has an advantage over PSS2B; secondly, the design of hardware and software are completed, with the hardware design including signal acquisition, the output of control signal and communication interface, while the software using time division multiple access, mainly involving sampling algorithm, the acquisition of input signal, PSS4 B algorithm and human-computer interface; at last, simulation of MATLAB and dynamic simulation test are done to confirm the excellent performance of PSS4 B. It should be noted that digital simulation selects the single machine finite system and four machines two regions system, yet the dynamic simulation test chooses only single machine finite system. The tests show that compared to PSS2 A, PSS4 B has a distinct advantage in the inhibition of low-frequency oscillation, enhancing the system damp, accelerating the speed of system to restore stability, and its good adaptability because of the wider working frequency.