Description
Woodward 9907-029
Technical Specifications
- Control Architecture: High-speed digital signal processing for real-time load sharing.
- Communication: Dedicated load-sharing communication bus for inter-governor data exchange.
- Measurement Inputs: True RMS current and voltage inputs for accurate kW calculation.
- Power Supply: Regulated 24 VDC supply with internal over-current protection.
- Output Drive: Analog bias output to the engine governor for load adjustment.
Functional Features
- Proportional Load Sharing: Ensures generators share load according to their rated capacities.
- Isochronous Speed Control: Maintains constant system frequency regardless of load changes.
- Reverse Power Protection: Detects and trips generators operating as motors to prevent mechanical damage.
- Droop Compensation: Adjustable droop characteristics for stable operation on infinite buses.
Application Scenarios
Critical for multi-generator power plants, marine vessel power systems, and industrial microgrids requiring reliable parallel operation.
Performance Parameters
- Load Sharing Accuracy: Within ±5% of rated capacity for active power.
- Frequency Regulation: Tight isochronous regulation with rapid transient recovery.
- Response Time: Fast adjustment to load changes to maintain system stability.
Material Composition
Constructed with high-reliability industrial electronics housed in a protective metal chassis. Terminals are gold-plated or nickel-plated to ensure long-term conductivity and corrosion resistance.
Structural Characteristics
- Mounting: Standard panel cutout or DIN rail mounting provisions.
- Indicators: Front-panel LEDs for power, load sharing active, and fault conditions.
- Wiring: Clearly labeled terminal blocks for straightforward field installation.
Working Principle
The module continuously measures the generator’s real power output and compares it to the expected share based on system load. It calculates a bias signal and sends it to the engine governor to increase or decrease fuel flow. Simultaneously, it communicates with other 9907-029 modules to ensure all units track the same frequency setpoint.
Installation Requirements
- Install in a clean, dry control panel with adequate ventilation.
- Connect load-sharing communication cables using shielded twisted-pair wiring.
- Ensure current transformer (CT) polarity and ratios are configured correctly.
Usage Precautions
- Verify phase rotation and CT polarity before placing generators in parallel.
- Do not disconnect load-sharing communication lines while generators are paralleled.
- Perform regular functional tests of reverse power protection.
