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Tag:
Adjusting
speed of auxiliary equipments such as fan and pump by variable frequency
technology makes each parameter at the best state, which improves
operation, enhances efficiency and saves power, water and coal, reduces
production cost, brings lots of benefits for power plant. Meanwhile,
inverter cooperates with control system of units, which can improve
automatization level, save labour, enhance management level of whole
system.
There are two aspects for inverter development in power plant. One is inverter itself development; the other is how to cooperate with progress of plant production technology and automatization.
For inverter itself development: development in big capacity and small dimension, modularization, voltage withstand and hardware universal are research goals in short time.
For application in power plant: manufacturer should improve inverter self-detection function; restore inverter fault quickly; solve problem of damper and valve quick response; digital connection to central system and so on. Furthermore, anti-dirt, heat, anti-disturbance and reliability should be researched and explored for a better mode.
There are two aspects for inverter development in power plant. One is inverter itself development; the other is how to cooperate with progress of plant production technology and automatization.
For inverter itself development: development in big capacity and small dimension, modularization, voltage withstand and hardware universal are research goals in short time.
For application in power plant: manufacturer should improve inverter self-detection function; restore inverter fault quickly; solve problem of damper and valve quick response; digital connection to central system and so on. Furthermore, anti-dirt, heat, anti-disturbance and reliability should be researched and explored for a better mode.
Tags: inverter, Medium voltage inverter
1) Reliability of components: LV is
better than MV. Mature product is better than the immature. For the same
component, the better can be chosen according to the brand and class.
2) Reliability of main circuit structure: for the requirement of reducing waste of transmitting power, most big capacity motors are medium voltage motor. Voltage class is most 6kV and 10kV.
There are several modes for inverter to output medium voltage. For high-high mode, the reliability of power cells seriers-connecting is better than direct-connecting of components. Medium-low mode or medium-low-medium mode is only temporary solution in development and they should disappear in market. Some experts believe motors of 1.7 kV, 2.3 kV, 3.3 kV, 4.16 kV should be researched or change connecting mode of motor coil and add a transformer ahead of inverter to match inverter, which acts in a procrustean way.
3) Reliability during operation: power plant has following requirements for inverter to ensure generator units safefy: continue derating operation with several cells broken; can be transferred to direct on line state when inverter is broken; inverter does not stop during instant power-fault; equip UPS for controller; power source of 380V fan is supplied by inverter.
2) Reliability of main circuit structure: for the requirement of reducing waste of transmitting power, most big capacity motors are medium voltage motor. Voltage class is most 6kV and 10kV.
There are several modes for inverter to output medium voltage. For high-high mode, the reliability of power cells seriers-connecting is better than direct-connecting of components. Medium-low mode or medium-low-medium mode is only temporary solution in development and they should disappear in market. Some experts believe motors of 1.7 kV, 2.3 kV, 3.3 kV, 4.16 kV should be researched or change connecting mode of motor coil and add a transformer ahead of inverter to match inverter, which acts in a procrustean way.
3) Reliability during operation: power plant has following requirements for inverter to ensure generator units safefy: continue derating operation with several cells broken; can be transferred to direct on line state when inverter is broken; inverter does not stop during instant power-fault; equip UPS for controller; power source of 380V fan is supplied by inverter.
Tags: inverter, Medium voltage inverter
This application introduced Gozuk inverter Power Plant, made comparison for energy saving, explained application prospect of variable frequency drive.
Energy saving effect
1) inverter parameter
2) motor parameter
3) Calculation
For fan and pump: Q∝n ,H∝n2,P∝n3
n---speed;
Q---flow;
H---pressure;
P—shaft power
When motor speed decreases to 80% of rated speed, input power of system (inverter + motor) decreases to 51% of that in rated speed. Thus, energy saving effect is more obvious when speed is low.
Make comparison in same working conditions:
The reconstruction cost can be recovered within 18 months.
Energy saving effect
1) inverter parameter
Model |
Gozuk Inverter |
Input vlotage | 6kV |
Rated current | 130A | Rated power | 1000kW |
2) motor parameter
Rated power | 1000kW | Rated voltage | 6kV |
Rated speed | 990rpn | Rated current | 118.8A |
3) Calculation
For fan and pump: Q∝n ,H∝n2,P∝n3
n---speed;
Q---flow;
H---pressure;
P—shaft power
When motor speed decreases to 80% of rated speed, input power of system (inverter + motor) decreases to 51% of that in rated speed. Thus, energy saving effect is more obvious when speed is low.
Make comparison in same working conditions:
Load | inverter before | inverter after | Energy saving rate |
125MW | 70A | 48A | 25% |
100MW | 55A | 29A | 40% |
The reconstruction cost can be recovered within 18 months.