D-VAR

D-VAR (Dynamic VAR) reactive compensation systems provide a powerful and cost-effective source of dynamic VARs for a wide range of operational needs. They can correct voltage instability problems on transmission networks; provide dynamic steady-state voltage and power factor control and regulation on transmission and distribution networks; protect industrial facilities requiring premium power quality; and support a stable point of interconnection for distributed generation facilities and large-scale wind farms. Classified as Flexible AC Transmission System (FACTS) devices, D-VAR systems utilize an American Superconductor proprietary and advanced control and monitoring system that detects and instantaneously compensates for voltage disturbances by injecting leading or lagging reactive power, measured in VARs (volt amperes reactive), precisely where it is needed on the grid. D-VAR systems are extremely flexible and scalable, ranging from 2 MVAR to hundreds of MVAR.

Applications
  • Localized Voltage Collapse Problems
  • Single Point, Large Block, Transmission Connected Solutions
  • Increasing Power Transfer Through Stability Limited Systems
  • Reducing and Retiring RMR Generation for Voltage Support
  • Wind Farm Voltage Regulation/ Low Voltage Ride Through
  • Voltage Regulation on Radial Lines, and in Weak Grids
  • Mitigating Industrial Voltage Transients
Features and Benefits
  • Provides steady-state voltage regulation
  • Delivers superior transient response
  • Improves grid reliability by stabilizing voltage
  • Generates/absorbs VARs dynamically
  • Modular construction enables quick deployment and future flexibility
  • More compact and less costly to install than competing devices
  • Highly efficient resulting in lower operating costs than other devices
Specifications
  • Connection: Medium Voltage (up to 46 kV)
  • Frequency: 50 or 60 Hz
  • Continuous Rating: ±2.0 to 100s of MVARs
  • Transient Overload Rating: 2.67 time continuous for up to 2 seconds (application-specific)
  • Response Time: Sub-cycle
  • Inverter: IGBT, 4 quadrant, stacked units, 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
    - Current source not subject to square of voltage de-rating factor at lower voltages as in other systems based solely on capacitors