AMSC - Model D-VAR - Dynamic Volt-Amp Reactive Compensation Solution

High-speed response to voltage disturbances
D-VAR systems stabilize and regulate voltage and power factor on T&D networks and at industrial operations. The system detects and rapidly compensates for voltage disturbances by injecting leading or lagging reactive power at key points on transmission and distribution grids. Each D-VAR solution is tailored to meet specific customer requirements and accommodates changing grid conditions.

Proven solution to stabilize voltage
D-VAR systems are proven worldwide to address a range of voltage stability issues and increase the power transfer capacity of utility networks. They are a valuable asset in helping the grid realize its full power transfer capability.

Modular, scalable, compact and flexible
D-VAR systems are highly modular and scalable by design. This allows utilities to install properly sized systems in the most effective power grid locations, staging the installation as desired, and quickly augmenting capability as demands increase. Each unit is compact to accommodate areas with restricted space availability. The D-VAR control system is highly flexible and customizable to allow the solution to address a wide variety of problems under a broad range of system conditions.

Meeting utility interconnection requirements
With D-VAR systems, wind and solar generation plants can meet utility interconnection requirements, including low voltage ridethrough (LVRT) and high voltage ride-through (HVRT) regulation and power factor correction. The systems help reduce stress on, and extend the life of, wind turbine gearboxes, switches and other components by mitigating transient voltage events and by soft switching capacitors and reactor banks with proprietary and patented technology.

• Improves grid reliability by regulating and stabilizing voltage
• Delivers superior transient response
• Generates and absorbs VARs dynamically for smooth power regulation
• Modular construction allows quick deployment and future flexibility
• More compact and less costly to install than competing devices
• Low power losses compared with competing devices
• D-VAR systems are modular and compact and accommodate areas with restricted space availability
• Capable of suppling steady state negative sequence current injection to mitigate voltage unbalance

Connection: Medium voltage (up to 46 kV)
Frequency: 50 or 60 Hz
Continuous Rating: ±2.0 to 100s of MVARs
Transient Overload Rating: 3 time continuous for up to 2 seconds (application-specific)
Response Time: Sub-cycle
Inverter: IGBT, 4 kHz switching frequency,
rated at 1 MVAR, continuous duty
Output: Independent phase control
Harmonics: Per IEEE 519
System Monitoring: Digital recording of system action, multiple inputs, alarms and warning signals
Ambient Temperature: -50°C to +50°C
Other:
Mobile configuration for quick deployment
Minimal on-site installation
Compact installation for minimal footprint
Remote monitoring
Environmentally benign
Ambient air cooling
Robust operation during low voltage conditions
Steady state negative sequence current injection to mitigate voltage unbalance

Reactive Compensation: Transmission and distribution systems
Steady-State Voltage Regulation: Radial or otherwise weak distribution systems, wind or solar power generation plants, industrial facilities; Voltage unbalance correction
Increasing Grid Capacity: Transmission systems
Reduce Reliability Must Run Generation: Transmission and distribution systems
Voltage Sag Mitigation and LVRT: Large and small industrial facilities, motor starting, wind and solar power generation plant integration