DEH (Digital Electric Hydraulic Control System) is a real-time comprehensive control system for steam turbine generator units. Its primary tasks include adjusting input power, valve positions, and pressure levels to meet external load demands according to customer specifications.
T80 Universal Turbine Controller
Introduction
T80 series universal turbine controller is a special controller suitable for small turbine machinery, which is suitable for single-channel servo loop steam turbine generator units (T80), dual-channel servo loop steam turbine generator units (T80C), and industrial drive units (T80I). The hardware of the controller adopts industrial-grade components to ensure the stable and reliable operation of the controller in the industrial environment for a long time.
System Features
· Digitization: Full digital electric adjustment design, with higher anti-interference ability, built-in servo power amplifier function, capable of driving various electro-hydraulic
· Ease of use: Simple and easy-to-use human-machine interface software, simple parameter settings, clear and reliable
· Safety: Control system designed according to the principles of "fail-safe protection" and "safety self-lock"
· Miniaturization: Small size, compact structure, easy to integrate other equipment, effectively saving installation space
Main Functions
· System adjustment: Small size, compact structure, easy to integrate other equipment, effectively saving installation space
Speed control, simultaneous grid connection, valve control mode, power control mode, pressure control mode, CCS mode, decoupling mode, primary frequency regulation
· Limit control: Overspeed limit (103% n0 ), valve position limit, high load limit, low main steam pressure limit
· Protection control: Overspeed protection (110% n0 )
· System testing: Overspeed test, OPC fast-closing valve test, offline simulation test, leakage test
T800K DEH
Introduction
K series DEH (T800K) is a general-purpose system designed based on HOLLiAS ® MACS-K. It adopts fast master control, dedicated all digital intelligent servo module, speed measurement protection module, CAN bus fast communication, and is equipped with a full range of I/O redundant modules to meet the stability requirements of different working conditions.
System Features
· Reliability: Full redundant multi-functional bus, realizing full redundant configuration of system power supply, field power supply and communication bus.
· Flexibility: Support for redundancy configuration of RTD, TC, AI, AO, DI, and DO as well as the servo module
Safety Control system designed according to the principles of "fail-safe protection" and "safety self-lock"
· Adaptability: Dedicated all-digital intelligent servo modules and speed measurement protection modules capable of driving various electro-hydraulic servo valves, LVDT directly connected to the servo control module for modulation and demodulation, and support for isolated grid operation capability
· Maintainability: Modular system design, making troubleshooting and component replacement easy
· Coordination: Shared with DCS data for coordinated control
Main Functions
· System adjustment: Speed control, simultaneous grid connection, valve control mode, power control mode, pressure control mode, CCS mode, decoupling mode, primary frequency regulation, valve management, automatic latching, automatic opening of the main steam valve, and remote control of the EH oil station
· Limit control: Overspeed limit (103% n0 ), valve position limit, high load limit, low main steam pressure limit, fast load reduction, low vacuum load limit, back pressure limit
· Protection control: Overspeed protection (110% n0 )
· System testing: Dummy grid connection test, overspeed test, valve exercise test, valve tightness test, high-pressure interruption module test, OPC fast closing valve test, oil injection test, offline simulation test.
T800N DEH
Introduction
N series DEH (T800N) is a general-purpose system designed based on HOLLiAS-N nuclear power plant digital instrument and control system. It is specifically developed for megawatt nuclear power turbine units, complying with the special specifications of the nuclear power industry and meeting the automatic control requirements of nuclear power turbine generator units. It realizes the integrated management of DCS and turbine monitoring and control for nuclear power units.
System Features
· Rapidity: Minimum opration period of 10 ms, which can meet the requirements of the turbine control of megawatt-level nuclear power units
· Reliability: Support for full redundancy configuration of power supply, controller, network and communication bus as well as fault diagnosis and switching
· Security: Master/slave controller hot standby redundancy, periodically redundantly transferring all data through a dedicated 1000M redundant network to ensure seamless switching
· Flexibility: Special speed measurement module NM635, servo module NM465, and full-digital programmable module, which can be used independently or integrated with HollySys main control systems through Profibus-DP bus.
Main Functions
· System control and adjustment: Turbine latching, turbine startup, speed regulation, automatic synchronization, grid connection, load control, valve position control, power control, pressure control, remote control, coordinated control, primary frequency regulation
· Limit control: Overspeed limit, valve position limit, load limit, pressure limit, fast load reduction, flow limit
· Online system testing: Overspeed test, valve exercise test, valve tightness test, OPC action (optional)
Turbine Control System Overview
Introduction
As the three necessary systems for turbine control, DEH is mainly responsible for controlling the startup, speed increase, operating under load and load regulation of the turbine to ensure stable operation of a turbine unit. ETS is mainly responsible for automatically and quickly cutting off the steam intake of a turbine when a fault occurs to protect the unit. TSI can continuously, accurately and reliably monitor the important parameters of turbine startup, operation and shutdown through sensors. When the monitored parameters exceed the limit, it can accurately and timely reports alarms or shutdown signals.
Features and Advantages
· Intelligent Velocity Measurement: The DEH special speed measurement module (3 out of 2) adopts the latest all-digital circuit, which can generate primary frequency regulation quantity, and cooperate with the servo module to complete the fast primary frequency control function.
· Efficient Configuration: With built-in fast DP (redundant) bus and CAN (redundant) bus, the primary frequency control function adopts independent high-speed CAN bus fast communication loop technology, featuring quick response.
· Intelligent Servo: The DEH special servo module adopts the latest all-digital circuit, and cooperates with the DEH special speed measurement module to complete the fast primary frequency control function through the CAN bus.
· Redundancy and Reliability: Servo module adopts redundancy configuration. Any servo channel can realize online redundant hot standby, and can automatically switch to the standby module when it is judged that the working module is faulty, and the switching time of the servo module is ≤ 10 ms. Servo valve adopts redundancy configuration. Two servo valves receive command signals at the same time to drive the oil motive to act. When one of the servo valves is determined to be faulty, a closure command is issued to the lockout valve of that servo valve. Subsequently, the remaining servo valve takes over all operations while an isolation electromagnetic valve is actuated to cut off the oil flow. Additionally, a shut-off valve on the oil line is used to isolate the fault point for maintenance, ensuring the continuous operation of the unit.
· Quick Master Control: The minimum IEC operating period of the controller is 10 ms, which can meet the rapidity requirements of ultra-supercritical units.
· Fast Frequency Regulation: With qualified primary frequency regulation capability, DEH can make the regulation period lower than 30 ms (non-control period).
· High-Performance Hydraulic Control: The hydraulic control system utilizes an independent high pressure 14 MPa control oil source, and the control of the oil actuated motor is integrated into the servo control system. This hydraulic control system is capable of achieving an oil actuated motor response time of less than 0.3s.
Applicable Model
Technical Parameters
· Speed adjustment range: Turning gear speed at 120% of rated speed
· Speed measurement accuracy: ≤ ±1 r/min Load control range 0 to 120%, accuracy 0.5%
· Speed variation ratio: Continuously adjustable within a range of 3 to 6%
· Control system insensitivity: < 0.06%
· Maximum overspeed at full load: < 7% of rated speed and able to maintain idling
· Steam extraction pressure control accuracy: ±0.01 MPa (suitable for C/CC units)
· Steam extraction pressure unevenness: 0 to 20%
· System control cycle: < 50 ms
· Minimum IEC operating cycle: 10 ms
· Anti-interference measure: Resistance to interference from various electromagnetic waves and communication devices on site, complying with IEC61131-2 and IEC61000-4 standards.
Company Profile
Audited Supplier 
){kind=link}