Why Power System Stabilizer Standalone (PSS SA)

Power system stabilizers (PSS) are commonly used to damp various types of oscillation modes,

as from interarea oscillations in large transmission networks to local oscillation modes of synchronous

generating units. This is done by adding a stabilizing signal to the voltage regulator of the existing

excitation systems.

The comprehensive and flexible solution: ABB’s UNITROL® 6000

Power System Stabilizer Standalone

Extend the life cycle of your current excitation system by adding functionality, fast and simple

• For any excitation brand – Indirect or Static excitation systems

• Extending the life cycle of your current system and enabling compliance with today’s complex grid code

regulations

• Full Power System Stabilizer (PSS) functionalities according latest IEEE421.5 standards (PSS 2A/2B/2C

or 4B/4C)

Advanced solutions and services to comply with the grid codes regulations

• Build-in signal injections and high-end recording features to support 

– System identification (of Generator and Grid), even when no dynamic Model data is available

from the OEMs- Fast and efficient capturing of network disturbances,

supporting post-mortem analysis of large-scale network events and prove related unit

compliance (e.g. NERC MOD-026-1)- Post-mortem analysis of failure on the complete gen-set.

• Adaptive PSS (APSS), with a patented grid observer, which optimizes the PSS settings based on actual

network and operation conditions.

• Advanced Speed measurement algorithms based on dynamic generator models to improve PSS

performance during interarea and local modes

• Dedicated RoCoF (Rate of Change of Frequency) PSS Blocking function to block PSS during large scale

grid frequency changes, to avoid malfunctions.

• Designated filter networks to avoid torsional interactions, and risks of mechanical damages