SFC synchronous frequency converting soft starting device
1.Application range
AC synchronous motor is widely used in large oil gas transport, marine propulsion, pumped storage, defense wind tunnel test and other industrial large power conditions. Especially in steel industry, it is widely used in large blast furnace blower, gas power generation coal gas compressor, oxygen production compressor and other main production equipment.
2.Performance
2.1 Product parameters
Starting time: 0-200 configurable
Output voltage: 0-motor rated voltage
Ouput current: less than 40% motor rated current
Main circuit topology: adopting single circuit, double circuits, 6,12,24 pulse rectification
Cooling method: heat pipe + forced air cooling
Applicable power range: 5-150MW synchronous motor
Load type: blast furnace fan, centrifugal fan, compressor, pump, turbine and so on.
Applicable voltage level: 6kV, 10kV and so on.
Main power components: thyristor 6500V voltage withstand, 300-3000A current optional
2.2 Features
2.2.1 starting capacity less than motor rated capacity, starting current less than motor rated current, can provide perfect solution for synchronous motor in strict power grid situations.
2.2.2 starting process adopts double closed-loop PID control, together with constant magnetic algorithm, ensures precise and controllable speed, smooth start of motor, avoids motor unit’s point of resonance.
2.2.3 simple to use, position sensor not required, with patented algorithm the software can realize rotor position detection.
2.2.4 provides different starting curves for different loads, especially for large pump storage motor, gas generator, blast furnace blower fan and other devices.
2.2.5 adopts high-low-high control scheme which is same to Siemens, realizes not only new motor start, but also localization products replacement and reform of old system.
2.2.6 adopts large LCD screen, can realize visual information interaction before and during starting process, convenient to use and inspect.
2.2.7 variable optional starting mode, can realize all synchronous start in static condition, turning condition and speed condition.
2.2.8 super large storage space for history starting data and fault record date, can meet user’s 30 days information query demands. Larger space design available for specified demands.
2.2.9 integrated structure. User only need to provide secondary power source, excitation interlock and primary in-outcome line, which ensures the installation only needs half a day.
2.3 technical innovations
2.3.1 control unit adopts DPS+FPGA scheme, have both DPS software’s flexibility and FPGA hardware’s high-speed.
2.3.2 adopts DC pulsant technology in low speed mode, periodically reduce the DC link current to zero, to realize converter reversing.
2.3.3 the converter adopts load inductive potential auto reverse mode.
2.3.4 synchronous connection adopts software computing, its control algorithm ensures there will be no current impact during synchronization and the synchronization time will be short.
3.Technical parameters
3.1 working principle diagram
3.1.1 single line diagram main circuit
Diagram 1(a):6 pulse wave single circuit
Diagram 1(b): 12 pulse wave double circuits
3.2 Working principle
HV synchronous frequency converting soft starting device adopts AC-DC-AC method. It consists of step-down transformer, rectification thyristor DC smoothing reactor, thyristor inverter, boosting transformer, synchronization device, rotor position detector and other components. The frequency converter start include: solid rotor start, low speed start, high speed start, synchronization full speed running, 4 processes. It adjusts output current and ensures motor is not out of synchronization by real-time tracking motor rotor position. According to preset starting speed curve it adjusts output frequency and drive the motor to full speed in specified time. Following diagram 2 is the functional block diagram of HV synchronous frequency converting soft starter device:
Diagram 2: HV synchronous frequency converting soft starter function block diagram
Diagram 3: control signal diagram of HV synchronous frequency converting soft starter
4.Main technical parameters
|
Item |
Standard |
Description |
|
Application standard |
Q／XDL J01-020—2013 |
Product company standard |
|
Installation |
Indoor |
Transformer is placed isolated |
|
Motor type |
HV AC synchronous motor |
All synchronous start |
|
Excitation requirement |
AC brushless excitation DC brush excitation |
|
|
Control power supply |
AC220V(5KVA） |
|
|
Protection grade |
IP20 |
Customized available |
|
Control method |
Dual DPS+FPGA chips control |
|
|
Connect to grid |
Synchronous |
Simultaneously power supply time of power grid and soft start no more than 200 ms; no impact current |
|
Controller communication mode |
RS485/RS232 |
Other industrial protocol optional |
|
Signal (input) specifications |
16 way, independent contact signal |
Can be expanded to 32 way |
|
Signal (output) specifications |
16 way, independent contact signal AC220V,5A |
Can be expanded to 32 way |
|
Operating mode |
Touchscreen, push buttons |
Touchable color resistive screen |
|
Interface language |
Entire Chinese(main) |
Other languages optional |
6. Type explanation
Motor rated voltage kV
Motor rated power kW
Serial number
HV synchronous frequency converting soft starter
Example: Type SFC1-8000/10, shows that this is 1series HV SFC soft starter applicable for 10kV synchronous motor whose maximum motor power is 8000kW.
|
Type |
Control cabinet and power cabinet(mm) (width*depth*height） |
Excitation cabinet(mm) (width*depth*height） |
|
SFC1-8000/6 |
2400*1200*2300 |
1100*600*2200 |
|
SFC1-10000/6 |
2400*1200*2300 |
1100*600*2200 |
|
SFC1-15000/6 |
2400*1200*2300 |
1200*800*2200 |
|
SFC1-20000/6 |
2800*1200*2300 |
1200*800*2200 |
|
SFC1-25000/6 |
2800*1200*2300 |
1200*1000*2200 |
|
SFC1-15000/10 |
2400*1200*2300 |
1100*600*2200 |
|
SFC1-20000/10 |
2400*1200*2300 |
1100*600*2200 |
|
SFC1-25000/10 |
2400*1500*2300 |
1100*600*2200 |
|
SFC1-32000/10 |
2800*1200*2300 |
1200*800*2200 |
|
SFC1-40000/10 |
2800*1200*2300 |
1200*800*2200 |
|
SFC1-50000/10 |
2800*1200*2300 |
1200*1000*2200 |
7. Ordering instructions
User should prove following parameters before ordering:
7.1 Ordered soft starter type;
7.2 Motor rated parameters including power, stator voltage, stator current;
7.3 Excitation mode, excitation rated parameters, whether excitation cabinet is required;
7.4 Load type;
7.5 Cabinet color (company standard or specified);
7.6 System drive requirements and site use conditions.
8. Product case
Product name: HV synchronous frequency converting soft stater (load commutation current type)
Type: SFC-50000/10
Manufacturer: Big Pawer electrical technology Xiangyang Inc. Co., Ltd.
Application company: Wuhan iron and steel group Co., Ltd.
Site: Wuhan iron and steel group Co. Ltd. Energy power plant No. 2 blower station
Motor parameters:
Type: 1DM4035-8DE01-Z
Rated power: 40000 kW
Rated voltage: 10 kV
Rated current: 2630 A
Power factor: 0.85 advance
Excitation parameters: 190V. 640A
Rated speed: 3000 r/min
Manufacturer: Siemens
Centrifugal type axial flow blower
Type: AG120-16RL6
Manufacturer: German MAN-GHH company
