IHI Original Control System
About IHI Original Control System
IHI Original Control System
The Control System of IHI (CSI) Series of IHI original control systems are products based on IHI characteristics and strength as gas turbine manufacturer and gas turbine power plant developer.
IHI offers a control system with the functionality, performance, high reliability, and high operability based on IHI characteristics and strength as gas turbine manufacturer and gas turbine power plant developer.
Evolution History of the CSI Series
Since 1988, over 80 sets of CSI Series products have been delivered to customers within Japan and overseas (as of January 2007).
The CSI-III, the third generation of models in the Series, are certified as a control system for the General Electric (GE) dry low emission (DLE)* engines by GE.
*Dry Low Emission (DLE): Dry Low Emission Combustion Method is the method enables to reduce the amount of NOx in gas turbine exhaust gas by controlling the mix ratio between the amount of fuel and the amount of air (fuel-air ratio).
Gas Turbine Control Unit (GCU)
The gas turbine control unit (GCU) that serves as a digital governor in the CSI-III is computer unit with VMEbus(Versa Module Europa bus) complied with the IEEE 1014 standard. GCU has a CPU as Pentium III (800 MHz) processor manufactured by Intel, which enables the system to complete a large volume of computational operations at high speed. Duplexed redundant systems enable to switch between main and sub systems instantaneously and are designed to continue plant control operations even in the event that the control system hardware failures or other issues occur.
Signal Conditioning Unit(SCU)
The signal conditioning unit (SCU) is a system to convert the input signals of the plant into the GCU input signal as recieved at GCU and to convert the GCU output signals into the output signal as transmitted to the plant.
Various transducers(sensors) are installed at gas turbine power plant and BOP(Balance of Plant) in order to monitor gas turbine rotational speed, temperature, pressure, flow rate, vibration and so on, as analog input signals. And, also control system transmit the command signal in order to control the actuators like variable mechanism of gas turbine and fuel gas control valve, as analog output signals.
In addition, control system recieves descrete signals in order to monitor the condition of plant and control system, as input descrete signals. And, control system transmits descrete signals in order to command plant and control system, as output signals.
Thus, signal conditioning unit is the system to convert the GCU input and output signals in order to monitor the plant condition and to operate the plant as the plant operator commands.
Operator's and Engineer's Station (OES)
The Operator's and Engineer's Station (OES) that acts as the interface between human user and machine for CSI Series products is equipped with an abundant variety of useful and user-friendly functions.
- Data monitoring and analysis functions
- OES has useful functions such as automatically saving data and daily plant operation data and trip data taken before, during, and after trips, for plant operation.
- And, OES also has a function to convert each type of save data to CSV format data.
- Engineering functions
- IHI original logic editor, so-called "LogiCAD" developed by IHI, enables to edit and manage logic statements as same as CAD-based design illustration.
| No. | Function | Overview | Specifications |
|---|---|---|---|
| 1 | Plant operation | - Plant operation functions including starting up/shutting down the plant, configuring engine output settings manually, and so on. | GUI(:Graphical User Interface) manipulation with mouse gesture |
| 2 | Real-time monitoring | - Monitoring functions of the conditions of plant operation in real-time with displaying trend graphs, tables, and system diagrams. - Printing Functions of log data (up to 128 data points maximum). |
Sampling period: 1 second Number of data aquisition points: Up to 512 points maximum for analog signals Up to 2048 points maximum for discrete signals |
| 3 | Plant alert system | - Alert functions of the failure occurred at the power plant, with displaying alert window and alert message box on the OES display and diplaying the alert lamp at the alert panel. | Sampling period : 1 second Data aquisition time length : 30 minutes Number of data aquisition points : Up to 256 points maximum Number of save files: Up to 64 files maximum |
| 4 | Start and stop trends (SST) | - Data acquisition functions of the data during the starting-up operation and shutting-down operation. (Arbitrary setting of 4 triggers is available.) | Sampling period : 1 second Data aquisition time length : 30 minutes Number of data aquisition points : Up to 256 points maximum Number of save files: Up to 64 files maximum |
| 5 | Historical trends (HT) | - Data acquisition functions of the daily data on a day-to-day basis in 24-hour-long sets. | Sampling period : 1 minute Data aquisition time length : 24 hours Number of data aquisition points : Up to 256 points maximum Number of save files: Files for up to 32 days maximum |
| 6 | Trip data storage (TDS) | - Data acquisition functions of the data after a trip (emergency shutdown) occurs for data analysis. (Arbitrary setting of up to 10 triggers is available.) | Sampling period : 10 milliseconds Data aquisition time length : 2 minutes before a trip and 1 minute after a trip Number of data aquisition points : Up to 256 points maximum Number of save files: Up to 64 files maximum |
Remote I/O System
Remote I/O system applications realizes that instrument signals are transmited through long distances without any noise. The electric signals of instrument signals as are converted into the optical signals at E/O converter, and transmitted to the fiber opticac cable.
Optical transmission enables to reduce the number of cables required.
Integrated Plant Power Generation Control
CSI Series products enables to divide the calculation cycle into five different stages and allows to calculate control calculations.
Integrated plant power generation control enables to control and manage gas turbine system, heat recovery steam generator (HRSG) system, and Balance of Plant (BOP)* system with 1 integrated plant power generation control unit(device) more effectively, nevertheless each calculation period order of power plant system is so different.
*Balance of Plant (BOP) : The auxiliary equipment of a power plant including equipment such as operating valves for the fuel gas compressors, water treatment units, and plumping lines.
Plant Control Integration
Individual Plant Control to control each power plant system as suboptimization and Integrated Plant Control to control overall power plant system as total optimization are needed for Combined Heat and Power (Cogeneration) System constituted with multiple gas turbines. With integrated plant control, different types of control operations are performed including control of number of units in operation, optimized load-sharing control and load-select control.
Particulary, variable heat and power system (FLECS) developed by IHI enables to supply electricity and steam more effectively with no waste by changing the amount of steam flow injected to gas turbine conbustion chamber to correspond to steam demand at customer facility.
CSI series products can calculate the behavior of the virtual FLECS simple model in the control sytem to take into account of fuel unit price, electricity unit price and so on.
They can calculate the optimal operation point corresponded to each energy demand condition, and they realizes to determine the operation point(mode) of each power generation unit automatically.
