UNITROL® Power System Stabilizer

Enhancing existing ABB / non-ABB excitation systems with advanced PSS functionality to comply with the grid code

Grid codes are constantly changing due to the new and unprecedented network developments.

Therefore, installed plant equipment requires to be upgraded/replaced to comply with the network regulations which leads to increased extended outages and costs.

PSS SA is a cost-effective solution to be compliant immediately.

• Microprocessor-based digital power system stabilizer with built-in transfer function in accordance with the latest IEEE421.5 standards (PSS 2A/2B/2C or 4B/4C)
• Built-in signal injections and high-end recording features
• Adaptive PSS (APSS), with a patented grid observer
• Dedicated RoCoF (Rate of Change of Frequency) PSS Blocking function
• Designated filter networks to avoid torsional interactions

• 3-phase high speed VT and CT measurements are configurable to match the plant setup
• Extended IOs, as DCS interface, and special configurations (e.g. for pump storage with PSS operation in generating and pump mode)
• Options for redundant configurations
• Dedicated touch screen interface
• System Status bar
  • Operation – Real time measurements
  • Parameter – Set parameters/signals and injection points
  • Events logger – Event logging including direct access to troubleshooting instructions
  • Slow and Fast trending – For commissioning and grid code compliance
  • Transient Recorder – Capture disturbance events on system and network

Would you like to discuss your grid stability needs?