One Question per Day 20181221

Turbine speed control； Automatic synchronization control ； Load control ； Participate in a frequency modulation session ； Coordinated control of machine and furnace ； Rapid load reduction ； Main steam pressure control ； Single-valve control, multi-valve decoupled control ； Valve testing ； Engine programmed start ； OPC control ； Control under load rejection and loss of magnetization conditions ； Dual-machine fault tolerance ； Achieve data sharing with the DCS system ； Manual control.

(1) Warm valve function. The unit uses a high-pressure cylinder startup method. The DEH has a function for pre-warming the valve housings of the high-pressure control valves; before the unit is started up, upon receiving a command to pre-warm these valves, valves 2 and 3 are slightly opened in order to pre-warm all 4 high-pressure control valves ； (2) Rotational speed control function. During the speed-up process of the unit (that is, when the unit is not connected to the grid), the DEH controls the unit’s speed increase through an acceleration control loop and a speed control loop, until the actual speed equals the target speed ； (3) Grid connection function. When the DEH receives the synchronization command, grid connection is permitted only after synchronization is achieved ； Load addition function. After connection to the grid, loading can be increased by manually setting valve position commands; once a certain load level is reached, the load can be adjusted by activating CCS, or again by manually setting valve position commands.

1. Basic BTC control functions； 2. VMC valve management function ； 3. ATC self-startup and control functions ； 4. OPC overspeed protection control function.

1) The DEH has an overspeed protection function, and it is possible to conduct a turbine overspeed test via the operator station. 2) It provides display, alarm, and printing functions. 3) The DEH can check the input signals; in the event of a fault, it issues an alarm, but it still allows the unit to operate safely without the need for operator intervention. The device is equipped with internal self-diagnosis and deviation detection functions; in the event of a system failure, it can switch to manual control and issue an alarm. 4) The DEH features redundant configuration and fault tolerance, manual/automatic switching capabilities, as well as functions for enabling and disabling the power feedback loop and the speed feedback loop. 5) The DEH has functions to limit the maximum, minimum, and load change rate. 6) The DEH has a robust and reliable interface with the CCS system. 7) The DEH is equipped with interfaces for connection to the Distributed Control System (DCS), Bypass Control System (BPC), Turbine Supervision and Protection System (TSI), Turbine Emergency Trip System (ETS), Power Grid ADS, Automatic Voltage Regulation Device (AVR), Automatic Synchronization Device (ASS), and other devices.

⑴Rotational speed control ⑵ Automatic synchronous grid connection ⑶ Power control ⑷ Valve position control ⑸ Pressure-controlled mode ⑹ Valve management ⑺ CCS mode ⑻ Primary frequency regulation ⑼ Limiting and protection functions ⑽ Valve tightness test ⑾ Valve mobility test ⑿ Operation parameter monitoring.

⑴Rotational speed control ⑵ Automatic synchronous grid connection ⑶ Power control ⑷ Valve position control ⑸ Pressure-controlled mode ⑹ Valve management ⑺ CCS mode ⑻ Primary frequency regulation ⑼ Limiting and protection functions ⑽ Valve tightness test ⑾ Valve mobility test ⑿ Operation parameter monitoring.

⑴Rotational speed control ⑵ Automatic synchronous grid connection ⑶ Power control ⑷ Valve position control ⑸ Pressure-controlled mode ⑹ Valve management ⑺ CCS mode ⑻ Primary frequency regulation ⑼ Limiting and protection functions ⑽ Valve tightness test ⑾ Valve mobility test ⑿ Operation parameter monitoring.

⑴Rotational speed control ⑵ Automatic synchronous grid connection ⑶ Power control ⑷ Valve position control ⑸ Pressure-controlled mode ⑹ Valve management ⑺ CCS mode ⑻ Primary frequency regulation ⑼ Limiting and protection functions ⑽ Valve tightness test ⑾ Valve mobility test ⑿ Operation parameter monitoring.

(1) Warm valve function. The unit uses a high-pressure cylinder startup method. The DEH has a function for pre-warming the valve housings of the high-pressure control valves; before the unit is started up, upon receiving a command to pre-warm these valves, valves 2 and 3 are slightly opened in order to pre-warm all 4 high-pressure control valves ； (2) Rotational speed control function. During the speed-up process of the unit (that is, when the unit is not connected to the grid), the DEH controls the unit’s speed increase through an acceleration control loop and a speed control loop, until the actual speed equals the target speed ； (3) Grid connection function. When the DEH receives the synchronization command, grid connection is permitted only after synchronization is achieved ； Load addition function. After connection to the grid, loading can be increased by manually setting valve position commands; once a certain load level is reached, the load can be adjusted by activating CCS, or again by manually setting valve position commands.

⑴Rotational speed control ⑵ Automatic synchronous grid connection ⑶ Power control ⑷ Valve position control ⑸ Pressure-controlled mode ⑹ Valve management ⑺ CCS mode ⑻ Primary frequency regulation ⑼ Limiting and protection functions ⑽ Valve tightness test ⑾ Valve mobility test ⑿ Operation parameter monitoring.