Specification of Woodward 2301A 9907 Series
The 9907 series is a variant of the Woodward 2301A controller, primarily designed to manage two core functions of generators driven by specific prime movers:
Precise load sharing control, ensuring balanced load distribution when multiple generator sets operate in parallel.
Stable speed regulation, adapting to speed requirements under different operating conditions.
The prime movers it controls include diesel engines, gasoline engines, steam turbines, and gas turbines. These power sources are uniformly referred to as "prime movers" in relevant technical documents.
1. Hardware Structure Features
The 2301A controller (to which the 9907 series belongs) features a highly operable and integrated hardware design:
Housed in a sheet-metal chassis, with the internal core consisting of a single printed circuit board for compact structure.
All potentiometers (adjustment components) are located on the front of the chassis, allowing direct access without disassembly—facilitating on-site debugging and parameter modification.
2. Core Control Modes & Application Scenarios
Relying on the 2301A controller, the 9907 series supports two core control modes to meet different operational needs:
2.1 Isochronous Mode
Centered on the goal of "maintaining a constant speed of the prime mover", it is applicable to the following scenarios:
Independent operation of a single prime mover, requiring stable speed output.
Parallel operation of multiple prime movers, which need to achieve coordinated control on an isolated bus through Woodward load sharing control systems.
Base loading operation connected to an infinite bus, where the load must be regulated by external devices (e.g., Automatic Power Transfer and Load (APTL) Control, Import/Export Control, Generator Loading Control, Process Control, or other load-controlling accessories).
2.2 Droop Mode
Focused on the goal of "dynamic speed adjustment with load changes", it is suitable for the following situations:
Operation of a single prime mover connected to an infinite bus, requiring speed adjustment based on grid load fluctuations.
Parallel operation of two or more prime movers, achieving stable coordination between units through the linkage of speed and load.
3. Typical Supporting Hardware
For a 2301A system (including the 9907 series) controlling a single prime mover and generator, the typical supporting hardware includes:
One 2301A electronic control unit (the 9907 series is part of this unit).
An external power supply: 20–40 Vdc for low-voltage models; 90–150 Vdc or 88–132 Vac for high-voltage models.
A proportional actuator to position the fuel-metering device.
Current transformers and potential transformers for measuring the load carried by the generator.
Applications of Woodward 2301A 9905/9907 Series
The 2301A 9905/9907 series electronic controls offer switch-selectable speed ranges, enabling each model to be configured for operation within one of the following rated speed intervals:
500 to 1500 Hz
1000 to 3000 Hz
2000 to 6000 Hz
4000 to 12,000 Hz
1. Application Adaptability & Model Options
The series provides versatile configurations to match diverse application requirements:
Actuation Direction: Compatible with both forward-acting and reverse-acting systems.
Actuator Type: Suitable for use with single actuators or tandem actuators.
Actuator Current Ranges: Available in three different current range options to fit various actuator specifications.
Voltage Models:
High-voltage model: Operates on 90 to 150 Vdc or 88 to 132 Vac (45 to 440 Hz), with clear identification on the front panel.
Low-voltage model: Operates on 20 to 40 Vdc, without special front-panel identification.
2. Reverse-Acting System Characteristics
In reverse-acting systems, the actuator behaves differently from forward-acting ones, providing a critical backup function:
When the actuator voltage decreases, the actuator adjusts to demand more fuel.
A complete loss of voltage to the actuator will drive it to the full-fuel position.
This design allows a backup mechanical ballhead governor to take over control, preventing the prime mover from shutting down (a common issue in direct-acting systems under voltage loss).
3. Optional Deceleration Ramp
An optional deceleration ramp feature is available to optimize speed transition:
If the deceleration ramp option is equipped, the time to ramp down from rated speed to idle speed is approximately 20 seconds.
If the option is not installed, the transition from rated speed to idle speed occurs instantly.
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