Abstract
WAMS(Wide-area Measurement System) is one of the most potentially effective techniques to damp inter-area low frequency oscillations in power systems. This paper studies the data corruption phenomenon which is ubiquitous in WAMS and establishes the unified model of time-delay and data-loss. Then DTA(Damping Torque Analysis) index considering time-delay and data-loss is deduced based on the previous model and applied to WADC(Wide-area Damping Controller) parameter tuning combining with the phase compensation method. Firstly simulations are carried out in 2A4M(2Area 4Machine) Kundur system and HDPG(Huadong Power Grid) with different timelays and data-loss ratios to show their impacts on small disturbance stability. Then DTA index is applied to PSS(Power System Stabilizer) parameter tuning and results show that it can effectively inhibit inter-area oscillations. With time-delay and data-loss ratio increasing, the superiority is getting more prominent.
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