Description

Woodward  9907-1183  Steam Turbine Digital Governor

Working principle
Sensor signal acquisition: Relevant parameter signals of the steam turbine are collected through 4-20mA sensors, such as rotational speed, load, inlet pressure, exhaust main pipe pressure or suction/intake main pipe pressure, etc. These sensors convert physical quantities into electrical signals and transmit them to the governor, providing a data basis for subsequent control.
PID control algorithm: The governor has a PID structure. Based on the signals collected by the sensors, the actual parameter values are compared with the preset set values to calculate the deviation value. Then, the deviation values are processed by using the proportion, integration and differentiation links, and the corresponding control signals are output to adjust the steam extraction/intake volume of the steam turbine, so as to keep the operating parameters of the steam turbine within the set range and achieve stable operation.
Microcontroller processing: The 32-bit microcontroller inside is the core processing unit. It receives signals from sensors, runs control algorithms, and precisely controls steam extraction/intake based on PID calculation results and ratio/limiter functions. At the same time, it monitors the operating status of the steam turbine to ensure that it does not operate outside the parameter range, playing a protective role.
Communication interaction principle: This speed controller supports multiple communication protocols and can interact with other devices or control systems through communication ports. The operating parameters of the steam turbine can be transmitted to the upper computer or distributed control system (DCS) to achieve remote monitoring. It can also receive control instructions from other systems to better integrate into the overall industrial control system and achieve collaborative control.
The operating principle of the human-machine interface: The enhanced 505 HMI is equipped with a large LED display screen. Operators can set parameters, view the operating status, etc. through the human-machine interface. The human-machine interface converts the operator’s instructions into electrical signals and transmits them to the microcontroller. At the same time, it displays the information fed back by the microcontroller in an intuitive way, achieving human-machine interaction.

Application case
Steam turbine control in power plants: The 22MW blast furnace gas generator set of Yunnan Degang has adopted the pure condensing steam turbine generator set provided by Hangzhou Turbine Works, and is equipped with a digital governor from Woodward, which may be of relevant models such as 9907-1183. The speed of the steam turbine is regulated through the digital electro-hydraulic speed regulation system, thereby controlling the load of the unit, ensuring that the generator set can operate safely and efficiently under various working conditions, and meeting the requirements of the power system for the rapid response and high precision of the regulation system of the grid-connected units.
Power regulation in combined heat and power systems: In some combined heat and power systems, the Woodward 9907-1183 steam turbine digital governor is applied. It can be used to control the rotational speed and output power of steam turbines, precisely adjusting according to the demands of power generation and heating, achieving efficient energy utilization. This not only ensures a stable supply of electricity but also meets the changes in heating load.
Speed regulation of rotating machinery in the chemical industry: In the chemical production process, there are many rotating mechanical equipment, such as compressors and pumps, which are often driven by steam turbines. For instance, in a large chemical enterprise, the key steam turbine in its production process adopts the Woodward 9907-1183 governor. By monitoring and controlling parameters such as turbine speed and load, it ensures the stable operation of the steam turbine, thereby guaranteeing the continuity and stability of the chemical production process and avoiding production interruptions caused by power equipment failures.
Speed control of ship power systems: In ship power systems, Woodward 9907-1183 can be used to control the speed and output power of the main engine of the ship. For instance, in some large cargo ships or cruise ships, the propulsion systems driven by steam turbines adopt this governor, which can precisely adjust the main engine speed according to the navigation requirements of the ship, ensuring the safe and stable navigation of the ship under different speed requirements, while improving fuel economy.