PureWave DSTATCOM®

Distributed transmission voltage support

Inverter-based distributed static compensation for transmission systems, delivering leading or lagging VARs in a fraction of a cycle and deployable inside existing substations. Supported with spares, field service and refurbishment, and available to build to order.

Reactive current response time of 2 to 4 milliseconds
Continuous ratings up to ±10 MVAR in a single container, in increments of ±1.25 MVAR
264% short-term current rating for 2 seconds, ramping to 100% at 4 seconds, or for 3 seconds then stepping to 100%
480 V output connects to systems up to 35 kV through a single step-up transformer
Housed in a conventional enclosure or standard ISO container; up to four enclosures can be paralleled
Can be deployed in existing substations and can control externally switched capacitor or inductor banks

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Overview

The PureWave DSTATCOM Distributed Static Compensator is a fast-compensating reactive power source that reduces voltage variations and voltage instability in the transmission system and assists in quick recovery after contingency events. It uses solid-state dc-to-ac inverters coupled to the utility system to create reactive current, supplementing conventional voltage and VAR control devices such as mechanically switched capacitor banks.

Because it is inverter-based, it provides compensating VARs on a subcycle basis. It can be deployed in existing substations, so compensation can be distributed through the system and projects phased in over a number of years rather than built as one large central asset.

It is offered with 480 V output that connects to systems up to 35 kV through a single step-up transformer, in a conventional enclosure or a standard ISO container.

Specifications

Electrical

System voltage, continuous output: 480 V to 35 kV, 50 or 60 Hz (single transformation)
Output voltage: 480 V, connects to systems up to 35 kV using a single step-up transformer
Continuous rating: Up to ±10 MVAR in a single container, in increments of ±1.25 MVAR
Short-term current rating: 264% for 2 seconds, ramping to 100% at 4 seconds; or 264% for 3 seconds, stepping directly to 100%
Inverter: IGBT, pulse-width modulated at 4860 Hz
Efficiency: > 98% typical

Performance

Reactive current response time: 2 to 4 milliseconds
Compensation: Leading or lagging VARs on a subcycle basis
Operating modes: Voltage control (steady-state or transient) and reactive power output control
External bank control: Can control externally switched capacitor or inductor banks

Control & monitoring

Operator interface: PC-based display showing equipment conditions and parameters in real time, with data-logging capability
Remote monitoring and control: Via modem connection or DNP 3.0 SCADA interface
Operation: Capable of automatic operation without operator intervention; built-in diagnostics

Cooling & enclosure

Cooling: Ambient air cooling
Temperature range: -40° to +50° C
Enclosure options: Conventional enclosure or standard ISO container; up to four enclosures can be paralleled for higher system output

Physical (typical pre-packaged ISO-style enclosures)

5.0 MVAR, 1 container: 40 ft (12.2 m) × 8.0 ft (2.4 m) × 9.5 ft (2.9 m) (L × W × H); 36,000 lb (16,364 kg)
7.5 MVAR, 1 container: 45 ft (13.7 m) × 8.0 ft (2.4 m) × 9.5 ft (2.9 m) (L × W × H); 48,000 lb (21,818 kg)
10.0 MVAR, container 1 (lead, 10 MVAR): 45 ft (13.7 m) × 8.0 ft (2.4 m) × 9.5 ft (2.9 m) (L × W × H); 48,000 lb (21,818 kg)
10.0 MVAR, container 2 (control): 20 ft (6.1 m) × 8.0 ft (2.4 m) × 9.5 ft (2.9 m) (L × W × H); 14,000 lb (6,363 kg)
15.0 MVAR, container 1 (lead and controls, 7.5 MVAR): 45 ft (13.7 m) × 8.0 ft (2.4 m) × 9.5 ft (2.9 m) (L × W × H); 48,000 lb (21,818 kg)
15.0 MVAR, container 2 (auxiliary, 7.5 MVAR): 40 ft (12.2 m) × 8.0 ft (2.4 m) × 9.5 ft (2.9 m) (L × W × H); 36,000 lb (16,364 kg)
Building footprint, ±10 MVAR with 264% short-time rating: 45 ft × 12 ft building (brochure compares a similarly rated static VAR compensator at nearly 90 ft × 90 ft)