CN207766177U - Air preheater control system with low voltage ride-through capability - Google Patents
Air preheater control system with low voltage ride-through capability Download PDFInfo
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- CN207766177U CN207766177U CN201721806005.9U CN201721806005U CN207766177U CN 207766177 U CN207766177 U CN 207766177U CN 201721806005 U CN201721806005 U CN 201721806005U CN 207766177 U CN207766177 U CN 207766177U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
Air preheater control system with low voltage ride-through capability.At home due to the network voltage of power plant shakiness, frequency converter low-voltage variation is caused to trip, this tripping can show as overcurrent protection or low-voltage variation because the protection setting of frequency converter is different, but its reason is all because caused by electrical network low voltage.The utility model forms：Air switch（1）, the air switch passes through conducting wire and frequency converter（3）, Power supply detector（2）, UPS control power supply（6）And power frequency contactor（8）Connection, the frequency converter, the Power supply detector, UPS control power supplys and the power frequency contactor pass through conducting wire and PLC（7）Connection, the PLC pass through conducting wire and frequency conversion contactor（4）Connection, the frequency conversion contactor and the power frequency contactor pass through conducting wire and motor（5）Connection.The utility model is used to wear the air preheater control system of dizzy drum with low-voltage.
Description
Technical field：
The utility model is related to a kind of air preheater control systems with low voltage ride-through capability.
Background technology：
At home since the network voltage of certain power plant is unstable, frequency converter is caused to produce new problem-in use
Frequency converter low-voltage variation trips, and this tripping can show as overcurrent protection or low pressure guarantor because the protection setting of frequency converter is different
Shield, but its reason is all because caused by electrical network low voltage.Low-voltage be usually all in short-term, be primarily due to power grid shake electricity or
Prepared auto restart switching time is long.Cause the reason that power grid shakes electricity very much, such as power network fluctuation, the load unbalanced, thunder of main grid side
It hits, the reasons such as electric power switching, the large scale equipment of load-side starts and the reasons such as application, circuit overload.Most of power plants for self-supply, it
For the electric energy and the thermal energy overwhelming majority produced for being used inside it, power plant's air preheater frequency converter is encountering station-service voltage
Momentarily less than under-voltage protection value (also different according to the different values of the model of frequency converter) of frequency converter when frequency converter shut down, cause
Pulverizer coal feeder is shut down, while can send out stop signal to FSSS (furnace safeguard supervisory system), can cause the MFT of FSSS dynamic in this way
Make.Because unplanned blowing out caused by the tripping of air preheater frequency converter low-voltage variation, prodigious economic loss is brought to power plant,
It is the bigger problem that current power plant faces, only solves the problems, such as that this just can guarantee power plant safety, reliable, efficient well
Normal operation.
Frequency converter has the function of soft starter for motor, speed governing etc. as the core component of preheater Variable Frequency Drives.Work as electricity
When net frees failure, network voltage will be caused to fall in short-term, the Station Service Electrical-Energy system voltage closed on also accordingly reduces, due to becoming
The reason of frequency device commutation inversion element characteristic, the decline of supply voltage often triggers frequency converter under-voltage protection, leads to frequency conversion
Device output locking, preheater shut down and electrical equipment are caused to damage, and will seriously affect the safe operation of boiler.
Utility model content：
The purpose of this utility model is to provide a kind of air preheater control system with low voltage ride-through capability.
Above-mentioned purpose is realized by following technical scheme：
A kind of air preheater control system with low voltage ride-through capability, supply unit, the supply unit are logical
It crosses conducting wire and switch is connect with frequency converter, described frequency converter one end is connect by conducting wire with motor, and the frequency converter is another
End is connect by conducting wire with programmable logic controller (PLC), and the programmable controller is connected by conducting wire and power detector
It connects, the power detector is connected on the switch.
The air preheater control system with low voltage ride-through capability, UPS control power control loop power supply,
Structural circuit is restarted using the tracking of PLC low voltage crossings, the PLC is programmable logic controller (PLC), UPS controls
Power supply is uninterruptible power supply, and the PLC uses Siemens LOGO.
Advantageous effect：
1. the utility model is the air preheater control system for having low voltage ride-through capability, the network voltage of power plant is not
Stablize, PLC also needs to carry out timing to the dead electricity time simultaneously, restarts into line trace when meeting low voltage crossing time conditions, surpasses
Dead electricity signal is sent out when going out the time, and frequency converter low-voltage variation caused by since network voltage is unstable can be overcome to trip.
The utility model controls power control loop power supply mode using UPS, and the tracking of PLC low voltage crossings is restarted.
The air preheater transmission device of the anti-low voltage ride-through capability of the utility model can such as save low-voltage ride-through power source, press
Often set transmission device can save 80,000 yuan, and every stove can save 160,000 yuan, annual to be calculated by 20 furnace gauges, can save 3,000,000 yuan,
Economic benefit is very notable.
The utility model system dc exports busbar and is controlled by thyristor and DC differential pressure control system, when normal operation and frequency conversion
Device is completely isolated.When grid voltage sags are within 90%, system does not work, and is in hot stand-by duty；When Voltage Drop to 0% ~
System instantaneous (＜ 200us) starts work in 90% range, maintains frequency changer direct current bus voltage in DC500V or so, ensures to become
Frequency device normal operation；When network voltage restores, system automatically exits from working condition, switchs to hot stand-by duty, and frequency converter is automatic
Conversion is powered by power grid；When MFT actions or frequency converter out of service, system automatically exits from, and switchs to hot stand-by duty.
Description of the drawings：
Attached drawing 1 is the structural circuit schematic diagram of the utility model.
Specific implementation mode：
Embodiment 1：
A kind of air preheater control system with low voltage ride-through capability, composition include：Air switch 1, it is described
Air switch power supply 6 is controlled by conducting wire and frequency converter 3, Power supply detector 2, UPS and power frequency contactor 8 is connect, it is described
Frequency converter, the Power supply detector, UPS control power supplys and the power frequency contactor are connected by conducting wire and PLC7
It connects, the PLC is connect by conducting wire with frequency conversion contactor 4, and the frequency conversion contactor and the power frequency contactor pass through
Conducting wire is connect with motor 5.
Embodiment 2：
According to the air preheater control system described in embodiment 1 with low voltage ride-through capability, UPS controls power supply control
Loop power supply processed restarts structural circuit using the tracking of PLC low voltage crossings, and the PLC is programmable logic controller (PLC), institute
The UPS control power supplys stated are uninterruptible power supply, and the PLC uses Siemens LOGO.
Claims (2)
1. a kind of air preheater control system with low voltage ride-through capability, composition include：Air switch, feature
It is：The air switch controls power supply with frequency converter, Power supply detector, UPS by conducting wire and power frequency contactor is connect, described
Frequency converter, the Power supply detector, UPS control power supplys and the power frequency contactor pass through conducting wire and PLC company
It connects, the PLC is connect by conducting wire with frequency conversion contactor, and the frequency conversion contactor and the power frequency contactor are by leading
Line is connect with motor.
2. the air preheater control system according to claim 1 with low voltage ride-through capability, it is characterized in that：UPS
Power control loop power supply is controlled, structural circuit is restarted using the tracking of PLC low voltage crossings, the PLC is programmable patrols
Controller is collected, it is uninterruptible power supply that the UPS, which controls power supply, and the PLC uses Siemens LOGO.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721806005.9U CN207766177U (en) | 2017-12-21 | 2017-12-21 | Air preheater control system with low voltage ride-through capability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721806005.9U CN207766177U (en) | 2017-12-21 | 2017-12-21 | Air preheater control system with low voltage ride-through capability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207766177U true CN207766177U (en) | 2018-08-24 |
Family
ID=63187771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721806005.9U Active CN207766177U (en) | 2017-12-21 | 2017-12-21 | Air preheater control system with low voltage ride-through capability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207766177U (en) |
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2017
- 2017-12-21 CN CN201721806005.9U patent/CN207766177U/en active Active
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