IS200SDCCG5AHD
IS200SDCCG5AHD
IS200SDCCG5AHD
but they should have an interface between DCS, conventional way to use a hard interface. The reserved protection automatic special devices are mainly as follows:
Change group protection device;
Automatic quasi-synchronous device (ASS);
Automatic voltage adjusting device (AVR);
Plant power quick cutting device;
Fault recording device.
The electrical systems of auxiliary systems outside the main plant, such as coal transport, water treatment, hydrogen production and electric dust removal, are not included in the DCS system for the time being.
DCS control level and technical requirements for electrical system
The whole process of automatic program control can be realized from boiler ignition to generator grid-connected initial load. (Of course, a limited number of breakpoints can be set after manual analysis and decision to intervene in the operation), or when the unit is shut down, DCS can safely shut down.
The requirements for unit self-start and stop control are:
When the unit starts normally, when the generator reaches the rated speed, DCS will be put into AVR. When the generator voltage reaches the rated value, DCS will be put into the same time device. The synchronization of generator and power grid is automatically realized by the synchronization device. In the synchronization process, AVR and DEH are controlled by DCS. When the synchronization conditions are met, closing instructions are sent to the generator circuit breaker. At the same time, the success of the closing, power generation mechanical load reaches a certain value, DCS will be high voltage plant power system quickly from the start to switch to the high voltage plant.
When the unit is shut down normally, DCS controls to reduce the load of the unit. When the load of the unit drops to a certain value, DCS will quickly switch the high voltage power plant system to the start/standby system for power supply; When the load of the unit continues to fall to zero, jump the main switch, the joint jump turbine (the main valve is closed), and
