The Langya mountain pumps water gathers can the
power plant be located west Chuzhou Nanjiao's Langya piedmont, is
exports the credit aid by the Austrian government the significant
project and Anhui Province "861" the construct with proper priority
project. The power plant general equipment department machine
capacity 600,000 kilowatts, install 4 single planes capacities are
150,000 kilowatts single stages are reversible -like pump water gather
can the unit. The entire power plant key position partially by
on reservoir, the water - carrige system, the underground workshop,
under the reservoir and the ground switch stands 5 parts. After
the power plant completes, will display in the electrical network
adjusts the peak to fill in the valley, the frequency modulation phase
modulation and the urgent accident spare and so on the vital role,
will improve Anhui Province and the East China electrical network
thermal power unit movement condition, will enhance the electrical
network movement the security reliability and the efficiency, the
economic efficiency and the social efficiency extremely is all
remarkable. The Langya scenery power plant public and ventilates the
air conditioning equipment to use the multilayered type control, the
host controls the workstation to suppose on 1 public utility the
position machine, each subsystem supposes the control unit, controls
in the situation in the host which and the network expires, the
control unit still could independently complete in its system the
equipment monitor and the control function. Each controls the subsystem to use PLC is the control
system, has the higher natural price ratio regarding the PLC request.
Should gather can the power plant select ABB AC31 series PLC.
AC31 series PLC may complete radiates several hundred meters
even several kilometer distributional applications, and has the
economy reliably, the disposition nimble, the communication function
is formidable and so on the characteristic, completely satisfies
should gather can the power plant control request. The system network architecture sees attempts:  The public utility host controls the workstation to be
responsible to coordinate gathers the management public utility
various subsystems the work, the recording and the computation
movement information, and stores after the processing data in the
database, simultaneously completes public and ventilates the air
conditioning equipment the distant place monitor and the distant place
control function. Various subsystems stand respectively are:
In the factory seeps the drainage pump system, the low pressure
air compressor system, the fire extinguishing pump and the rain
drenches the valve control system, the well ventilated
air-conditioning system, AC31 50 series PLC system is responsible to
each sub- station carries on the control. Among them, ventilates
the air-conditioning system to divide primarily the workshop, the
vice- workshop, the installment field vice- workshop as well as the
going beyond a line shaft several long-distance control stations, each
long-distance control station separately carries on the disperser
control by several set of long-distance I/O, long-distance I/O selects
50 series Modbus long-distance expansion module, not only enhanced the
system natural price compared to, moreover can guarantee the system
the stable movement. Every time wraps the PLC sub- station all
to use MODBUS agreement and on the public utility the position machine
carries on the correspondence, the sub- station controls the
workstation with the host the distance most length is 1,380 meters.
The entire wrap system has used AC31 the series PLC superiority,
has realized the optimized control. After the system investment movement completely achieved
the user request, the overall system design reasonable, the operation
simple, safe is reliable, and continuously revolves good, obtained
user's high praise. | 