Description

Woodward  9907-019  Digital Speed Control controller

Function Introduction
Rotational speed control function The rotational speed can be set through manual operation on the panel, using the up/down speed keys on the panel, external up/down speed input contacts, or receiving a 4-20mA current signal. The monitored turbine rotational speed signal is compared with the internal set value. After the action of the rotational speed PID amplifier, a 4-20mA control signal is output to control the valve opening degree. So as to adjust the output of the steam turbine and stabilize the rotational speed of the steam turbine at the set value.
Cascade control function: It is equipped with a cascade PID control module inside, which can accept the inlet and outlet pressure signals of the steam turbine’s intake and exhaust or the driven machinery such as the compressor as cascade input signals. Compared with the cascade set value, after the cascade PID action, the output signal changes the speed set value, and the pressure is controlled by adjusting the steam turbine speed.
Load sharing and synchronization function: It is equipped with a synchronous load sharing function, compatible with most existing analog load sharing speed control systems, and has soft loading and unloading capabilities. Adjustable load control can also be carried out in the drooping basic load mode through discrete ascending and descending contacts. Or in the isochrone base load mode, a constant load level operation is provided for the utility bus, and the load Settings can be changed through discrete input or remote 4-20mA input.
Overspeed protection function: It can conduct overspeed tests on the overspeed protection equipment of the steam turbine. It also has an overspeed protection function. When the rotational speed exceeds the set safety value, it will take corresponding measures, such as outputting control signals to close the valve, etc., to prevent the equipment from being damaged due to overspeed.
Critical speed avoidance function: It can set two critical speed ranges. Within the critical speed range, a faster acceleration rate can be set to enable the steam turbine to pass through the critical zone quickly, avoiding resonance caused by long-term operation at the critical speed and damage to the equipment.
Valve position limiting function: It can limit the opening degree of the steam turbine regulating valve to prevent excessive opening or closing of the valve, ensuring that the equipment operates within a safe and reasonable range. At the same time, it also helps to optimize the operational efficiency and performance of the steam turbine.
Self-diagnosis and alarm function: Equipped with an internal self-diagnosis function, it can monitor the system status in real time, detect faults in the system, and issue alarm signals through the human-machine interface and other means to notify the operator of any possible abnormal system conditions, significantly reducing the time for troubleshooting.
Data monitoring and recording function: It can monitor the operating status of the equipment in real time, including parameters such as rotational speed, load, and temperature, and has data recording and analysis functions to help users optimize operation and maintenance strategies.
Communication function: Supports multiple input and output interfaces, facilitating data exchange and communication with sensors, actuators, and other control devices. It can achieve remote monitoring functions, making it convenient for users to perform remote operations and management.

Specific case introduction:
Combined heat and power system: In steam-powered combined heat and power projects, it can be used to control the rotational speed of the steam turbine to ensure stable power generation by the generator, while optimizing the efficiency of combined heat and power to meet the power supply and heating demands of enterprises or regions. By precisely adjusting the rotational speed of the steam turbine, the system can maintain efficient operation under different heat loads and electrical loads, achieving comprehensive utilization of energy.
Power plant: In traditional thermal power plants or nuclear power plants, this speed controller is used to control the speed and output power of the steam turbine to meet the load requirements of the power grid, while maintaining the stable operation of the generator set. It can quickly adjust the rotational speed of the steam turbine according to the changes in the grid load, ensuring the stability of the generator’s output voltage and frequency, and providing reliable power supply to the grid.
In the industrial field: In industries such as steel, chemical engineering, and papermaking, for scenarios requiring high-power drive, the 9907-019 digital speed control controller can be utilized to drive generators or other mechanical equipment. For instance, in a steel plant, it is used to control the rotational speed of the steam turbine that drives the blast furnace blower, precisely adjusting the air volume according to the production process requirements to ensure the stable operation of the blast furnace.
Marine power system: On large ships, it can be used to control the rotational speed of the main propulsion steam turbine engine of the ship, achieving operations such as forward movement and stopping of the ship. By precisely controlling the rotational speed of the steam turbine, the navigation performance and fuel economy of the ship can be improved, while ensuring the stable operation of the ship under different sea conditions.
In the field of renewable energy: In some renewable energy projects, such as biomass power generation and geothermal power generation, this speed controller can also be used to control related turbine equipment. For instance, in geothermal power generation projects, by adjusting the rotational speed of the steam turbine in accordance with the changes in geothermal resources, the generator set can maintain a stable power generation capacity under different steam flow and pressure conditions, thereby enhancing energy utilization efficiency.