Description
Application Scenarios
In a captive thermal power plant at a chemical facility, a 3 MW waste-heat steam turbine generator must dynamically adjust output based on production steam demand while operating in parallel with two gas generators. Generator terminal voltage stability and precise reactive power sharing directly affect plant-wide power quality. The DECS-100-B15 serves as the excitation control core: it continuously monitors generator terminal voltage and outputs PWM signals through a PID algorithm to drive the excitation power stage, maintaining voltage fluctuation within ±0.25%. When a gas generator load surge causes temporary system voltage drop, the DECS-100-B15 10-second forcing capability rapidly raises excitation output to 135VDC/15ADC, maintaining terminal voltage stability during grid disturbances and preventing sensitive production equipment from tripping due to voltage sags.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | DECS-100-B15 |
| Manufacturer | Woodward (originally Basler Electric) |
| Product Category | Digital Automatic Voltage Regulator (AVR) / Excitation Controller |
| Voltage Regulation Accuracy | ±0.25% steady-state; ±0.5% under 40% THD harmonic conditions |
| Continuous Excitation Output | 63VDC / 7ADC (PWM chopper) |
| 10-Second Forcing Output | 135VDC / 15ADC |
| Voltage Sensing Input | Single/three-phase, 120/240/400/480/600VAC selectable, 50/60Hz auto-sensing |
| Current Sensing Input | 5A CT secondary (B15 variant), burden < 1VA |
| Control Modes | AVR constant voltage / VAR constant reactive power / PF constant power factor / Manual excitation (four switchable modes) |
| Protection Functions | Over-excitation limit (OEL), under-excitation limit (UEL), V/Hz limit, loss-of-sensing protection |
| Communication | RS-485 Modbus RTU; USB commissioning port (BESTCOMS software) |
| Operating Temperature | -40°C to +70°C (fully encapsulated) |
| Dimensions | 265 × 75 × 135 mm, net weight approximately 0.8 kg |
