Description
hardware flow control. It is an ideal choice in the field of industrial automation.
Guoxin Yangdian ABB excitation regulator technology upgrade
1 Overview
The 2×630Mw coal-fired units (units #3 and #4) of Jiangsu Guoxin Yangzhou Power Generation Co., Ltd. were put into commercial
operation in September 2006 and January 2007 respectively. The generator excitation system is a complete set of excitation
system equipment imported from Switzerland provided by Shanghai ABB Engineering Co., Ltd. The supporting excitation system is
ABBUnitrol5000
. For more than 10 years of operation, jumper Hall elements have been disturbed and tripped, and ARCnet communication
faults have tripped. and other problems, and as the use time increases, the failure rate increases significantly,
and the stability of the excitation system gradually
decreases. According to the needs of unit capacity increase, efficiency improvement and upgrading, the company has
simultaneously upgraded the excitation system, upgraded the original Unitrol5000 to the latest Unitrol6800 system, and also
adjusted the original components
such as resistance-capacitance absorbers and jumpers. Make sure the parameters match.
2 Advantages of the modified excitation system
2.1 The reliability of the three-channel input power supply redundancy mode in the control part is improved
The power supply of the control part adopts three input power supplies with AC or DC redundancy mode, thus
improving the reliability of the system. Each control module is equipped with two independent power supplies for power supply,
which significantly improves the redundancy of the power supply. In this way, the power supply of the control module can be disconnected separately to
facilitate online replacement of faulty components. Secondly, since the boards are installed independently and each board is
powered by dual power supplies, the power supply has an independent switch, making online maintenance work safer.
2.2 Fiber optic redundant internal communications
Unitrol6800 uses optical fiber redundancy for internal communication, which avoids the problem of downtime caused by
ARCnet serial communication in the Unitrol5000 system. The controller can independently transmit the trigger pulse of the
thyristor to the rectifier bridge. In conjunction with optical fiber transmission, the trigger pulse can be generated in each rectifier bridge, making the
internal communication more resistant to interference.
2.3 Eliminate the security risks brought by the public PSl board in the original system to the system
Unitrol6800 uses a rectifier cabinet to separately collect the synchronization voltage, excitation voltage and excitation current,
which reduces the safety hazards caused by the public PsI board. In the rectifier bridge of Unitrol6800, the AC side phase sequence
detection function is added. The fan power supply uses the independent power distribution method of each rectifier cabinet. The fan power supply
loop control system of all rectifier cabinets is inside the rectifier cabinet, ensuring that each rectifier cabinet is It can independently
control the fan in the cabinet, thereby solving the problem of power loss in the fan circuit of Unitrol5000 due to relay failure and avoiding non-stop
accidents.
In the rectifier bridge of the Unitrol5000 system, a Hall element is installed on the rectifier side to measure the excitation current
of the rectifier bridge. The current sharing of the excitation current by the system must be carried out through a current sharing test.
However, the characteristics of the Hall element itself prevent it from being based on the load. changes in dynamic current sharing. To this end,
in the Unitrol6800 system, a CT is installed on the AC incoming line side of the rectifier cabinet to sample and calculate the
excitation current. The linearity of the CT is very high, which ensures that the excitation system can perform dynamic current sharing according to the
load changes of the working conditions, allowing Each rectifier cabinet of the system can be more balanced.
In the rotor overvoltage protection of the Unitrol6800 system, a current relay is used to detect the current. Since the anti-interference
ability of the current relay is stronger than the Hall element of the Unitrol5000, it can avoid false alarms of the rotor
overvoltage in the excitation system caused by external interference and avoid power generation. The occurrence of unit non-stop accidents.
3 Renovation Plan
The steam turbine generator unit has been modified to increase capacity and improve efficiency. The rated output of the steam
turbine unit has been increased from 630Mw to 650Mw, the self-set rated current of the generator has been increased from
17495A to 19245A, and the rated voltage of the excitation rotor
has also been increased from 400.1V to 428V. The excitation current increases from 4387.4A to 4697A. In this transformation
, the cabinet structure of the excitation system remains unchanged. The system upgrade is achieved by upgrading boards, updating equipment and
upgrading the control system. During the transformation process, it is necessary to ensure that the generator capacity is
increased, and the excitation system needs to provide more excitation current and voltage to ensure the stable operation of the unit by increasing the
deexcitation capacity.
3.1 Adjustment of demagnetization and AC side voltage absorption module
Since the generator is upgraded from 630Mw to 650Mw, the demagnetization and AC side overvoltage
absorption modules need to be adjusted. For the adjustment of the capacity of the excitation de-excitation
resistor, the capacity calculation of the de-excitation resistor needs to be calculated based on the most serious
de-excitation state of the generator. The demagnetizing resistor is a siC nonlinear resistor
. The number of resistors is changed from 5 to 6. The capacity of the demagnetizing resistor is 6MJ, which
meets the needs of the excitation system for demagnetizing. In the modification of the demagnetization circuit
jumper, the voltage resistance level of the thyristor was improved by replacing the jumper and BoD board. Regarding
the transformation of the overvoltage absorption module on the AC side of the rectifier bridge, according to the design
of the rectifier bridge of the ABB excitation system, the overvoltage absorption modules on the AC side of the rectifier bridge were changed to five groups in parallel.
https://www.xmamazon.com
https://www.xmamazon.com
https://www.plcdcs.com/
www.module-plc.com/
https://www.ymgk.com
MSR241P Modular safety relay
VT-VPCD-1-16/V0/1-0-1 Electronic signal amplifier
HMCPE100T3C EATON Motor circuit protector
8444-1091 Energy meter
CML25.1-3N-400-NN-NNC1-NW driver
UG-8L mechanical hydraulic governor
SUE3000 high speed switching device
MKD071B-035-KP1-KN servomotor
IC660BRD024 GE Input/output module
MU-PDIY22 Digital input 24 Vdc processor
TK-PRR021 Redundant module
TK-IOLI01 Input/output module
IC694MDL940 GE 16 point relay output module
IC694MDL645 Positive/negative logic input module GE
V7768-322001 GE Single board computer
IS215VCMIH2CA GE Communication Interface Card
IS215VCMIH2BB GE Interface Card
Agilent E1740A Time Interval Analyzer
E1406A Agilent VXI GPIB Command Module
ABB DDC779BE02 3BHE006805R0002 Controller Module
ABB CI626 3BHT300053R1/E Communication module
ABB AGPS-21C 64668064 POWER SUPPLY
ABB AFPS-01C 64711245 POWER SUPPLY
ABB VBX01T VBX01B Bus Extender
ABB VBX01BA Bus Extender
ABB ES1530 HESG330187R0001 Printing plate
ABB CP676 1SAP576100R0001 64 K colors
ABB CP665 1SAP565100R0001 touch scre
ABB CP651 1SAP551100R0001 touch screen
ABB CP430B Touch screen 16 Blue levels
ABB CP660 HMI
ABB CP450T 1SBP260188R1001 Touch screen 64K Colors
ABB CP650 Control panels
ABB CP635 1SAP535100R0001 touch screen
CM10/200S0E0/STD ABB CM10 universal process controller
ABB CP620 1SAP520100R0001 TFT touch scree
ABB AINT-02C Inverter main circuit interface board
05704-A-0145 honeywell Four channel control card
05704-A-0144 honeywell 4 Channel Control Card
05701-A-0502 honeywell Rack assembly 8 way
05701-A-0361Engineering Card honeywell
810-225420-002 LAM Semiconductor circuit board
88UB01A GJR2322600R0100 ABB Security Key Board
70BK03B-ES HESG447271R2 Interface Module ABB
70BA01C-S HESG447260R2 ABB Bus End Module
70AA02B-E HESG447388R1 ABB PCB Circuit Board
8LSA35.E2060D000-0 B&R servo motor
07KT98 H4 GJR5253100R3262 Basic Module
3IF661.9 B&R Interface module
CI930F Communication Interface ABB
DS200TCRAG1ACC Relay output board
DS200TCPDG1BEC distribution board GE
IC695ETM001-EK Ethernet interface module
VMIVME-2532A High Voltage Digital Input and Output Modules
CC-TDIL61 digital input module honeywell
Reviews
There are no reviews yet.