Stabilization system PCS-992

Product overview
The PCS-992 Power Stability Control System (PSCS) provides a system-level solution to improve power system stability and reduce the incidence and impact of blackouts. The PSCS is intended for protection and stability management of critical infrastructure and large-scale grids such as hospitals, mines, fuel stations and water treatment facilities.

Architecture & functions
Master Station Functions

• Compute region-scale control tactic tables based on predesigned stability studies
• Distribute data and tactics to subordinate stations and execution units
• Collect wide-area data and issue coordinated control outputs

Sub-Master Station Functions

• Derive regional tactic tables and adapt master-level strategies to sub-regions
• Relay data and receive coordination from master stations
• Acquire local data and forward commands to execution stations

Execution Station Functions

• Calculate local-scale control tactics for immediate response
• Transmit local status to higher-level stations
• Execute tripping, closing or dispatch commands (e.g., load shedding, generator trip)

System capabilities and operational features

• Monitor operating conditions of outgoing lines, transformers and generators
• Exchange status and measurement data between stations in real time
• Automatically identify grid operating mode and topology
• Discriminate fault types on lines, transformers and busbars
• Perform stability analysis using power flow and fault-type inputs to calculate optimal control strategies
• Determine remedial measures: generator shutdown, load shedding, separation, DC power modulation, rapid reduction of generator output
• Apply real-time control for frequency/voltage stability and overload mitigation independent of current operating mode
• Select units for shutdown according to predefined criteria
• Transmit and coordinate control commands across the communication network
• Execute received commands after local discrimination and confirmation
• Support remote monitoring, remote setting modification and GPS clock synchronization
• Provide self-checking, abnormality alarms, automatic display and printing

Inter-station coordination

• Coordinate with central units in other master stations for region-wide stability management
• Receive discrimination results from local bay units and integrate them into tactic selection
• Establish power transfer limits and determine system operation mode for coordinated actions
• Implement stability control tactics across master, sub-master and execution stations
• Acquire and process data at multiple station levels and execute coordinated remedial commands

Technical specifications

• Model: PCS-992
• Product type: Power Stability Control System (PSCS)
• Control approach: instability-prediction-based control using predesigned tactic tables
• Tactic tables: prepared from predetermined and simulated stability studies and strategy analysis prior to installation
• Real-time functions: data acquisition from substations/power plants, stability analysis, selection and execution of remedial actions
• Control actions: load shedding, generator shutdown, separation, DC power modulation, rapid reduction of generator output, tripping/close commands
• System architecture: master stations, sub-master stations, execution stations
• Communication: optical fiber links between master and sub-master stations
• Applications: protection of critical infrastructure and large-scale power grids to prevent oscillations and cascading instability