CN115514083A - Coal feeder motor converter power switching system - Google Patents
Coal feeder motor converter power switching system Download PDFInfo
- Publication number
- CN115514083A CN115514083A CN202211292094.5A CN202211292094A CN115514083A CN 115514083 A CN115514083 A CN 115514083A CN 202211292094 A CN202211292094 A CN 202211292094A CN 115514083 A CN115514083 A CN 115514083A
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- CN
- China
- Prior art keywords
- power supply
- frequency converter
- contactor
- motor frequency
- switching system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The invention discloses a power supply switching system of a frequency converter of a motor of a coal feeder, which supplies power by setting a working power supply and a standby power supply; the working power supply is provided with two groups of voltage monitoring contactors; the standby power supply is provided with a voltage monitoring contactor; a working power supply contactor is arranged between the working power supply and the standby power supply; a common bus of a frequency converter power supply is connected to a low-voltage ride-through device; the invention can meet the requirement of stable operation of a system, ensure that the frequency converter does not have abnormal operation working conditions of overvoltage and long-term low voltage, and avoid fuel loss and boiler MFT non-stop accidents caused by the shutdown of a plurality of coal feeder frequency converters.
Description
Technical Field
The invention relates to the technical field of power supply switching devices, in particular to a power supply switching system of a coal feeder motor frequency converter.
Background
The burner of the thermoelectric boiler burns to obtain heat energy, and the heat energy is converted into electric energy through the generator set; the combustor of the thermoelectric boiler is provided with a plurality of coal feeders, and the coal feeders are provided with a plurality of frequency converters; one of the frequency converters can influence the normal use of the other frequency converters due to the short circuit of a power supply or the fault of the frequency converter, so that fuel loss is caused, and the MFT of the boiler can be in non-stop accidents.
Disclosure of Invention
The invention aims to provide a power supply switching system of a frequency converter of a motor of a coal feeder, which aims to solve the problems of low efficiency and low safety caused by fault detection and maintenance manually in the prior art, and can ensure the stable operation requirement of the system.
A power supply switching system of a frequency converter of a motor of a coal feeder comprises a low-voltage ride-through device, a working power supply and a standby power supply;
the motor frequency converter to be switched is connected with a standby power supply through a low-voltage ride-through device, the motor frequency converter to be switched is connected with a working power supply through a control switch, a voltage monitoring contactor is arranged on a connecting wire of the motor frequency converter to be switched and the working power supply, a voltage monitoring contactor is arranged on an output wire of the standby power supply, and a working power supply contactor is arranged between the working power supply and the standby power supply.
Preferably, every 8 frequency converters are arranged in one frequency conversion cabinet.
Preferably, a power supply public bus of the motor frequency converter to be switched is connected into the low-voltage ride-through device.
Preferably, the standby power supply adopts a UPS (uninterrupted power supply).
Preferably, a standby power supply contactor and a standby power supply air switch are arranged on an output line of the standby power supply.
Preferably, the control power for the operating power contactor is taken from the backup power source.
Preferably, two groups of voltage monitoring contactors are arranged on a connecting line of the motor frequency converter to be switched and the working power supply, and time relays are arranged on the two groups of voltage monitoring contactors.
Preferably, the time delay of the time relay is set to 15s.
Preferably, the normally open contacts of the two sets of voltage monitoring contactors are connected to voltage monitoring contactors connected to the backup power source.
Preferably, a power switch, a working power supply alternating current contactor and a working power supply air switch are sequentially arranged on a connecting line between the motor frequency converter to be switched and the working power supply, and a connecting point of the voltage monitoring contact is positioned on the connecting line between the working power supply alternating current contactor and the working power supply air switch.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a power supply switching system of a coal feeder motor frequency converter, which is powered by a working power supply and a standby power supply; the working power supply is provided with two groups of voltage monitoring contactors; the standby power supply is provided with a voltage monitoring contactor; a working power supply contactor is arranged between the working power supply and the standby power supply; a common bus of a frequency converter power supply is connected to a low-voltage ride-through device; the invention can meet the requirement of stable operation of a system, ensure that the frequency converter does not have abnormal operation working conditions of overvoltage and long-term low voltage, and avoid fuel loss and boiler MFT non-stop accidents caused by the shutdown of a plurality of coal feeder frequency converters.
Drawings
Fig. 1 is a schematic wiring diagram of the working power supply and the standby power supply in the embodiment of the invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
As shown in fig. 1, the power switching system of the frequency converter of the motor of the coal feeder provided by the invention comprises a low voltage ride through device 1, a working power supply and a standby power supply;
the motor frequency converter to be switched is connected with a standby power supply through a low-voltage ride-through device, the motor frequency converter to be switched is connected with a working power supply through a control switch, a voltage monitoring contactor 1C is arranged on a connecting line of the motor frequency converter to be switched and the working power supply, a voltage monitoring contactor 3C is arranged on an output line of the standby power supply, and a working power supply contactor 12KM is arranged between the working power supply and the standby power supply.
Specifically, every 8 frequency converters are arranged in one frequency conversion cabinet. The dual-power supply of the working power supply and the standby power supply is arranged, the switching system can be used for timely switching to the standby power supply when low voltage or instantaneous fault occurs, the abnormal operation working condition that overvoltage and long-term low voltage do not occur to the frequency converter is ensured, and non-stop accidents of fuel loss and boiler MFT caused by stopping operation of multiple coal feeder frequency converters are avoided.
The working power supply contactor 12KM is used for controlling the unidirectional switching between the working power supply and the standby power supply;
and a power supply public bus of the motor frequency converter to be switched is connected to the low-voltage ride-through device.
The standby power supply adopts a UPS power supply. And a standby power supply contactor 12QC and a standby power supply air switch 12QF are arranged on an output circuit of the standby power supply.
The control power for the working power contactor 12KM is taken from the backup power.
Specifically, two groups of voltage monitoring contactors, namely a voltage monitoring contactor 1c and a voltage monitoring contactor 2c, are arranged on a connecting wire of a motor frequency converter to be switched and a working power supply; and time relays are arranged on the voltage monitoring contactor 1c and the voltage monitoring contactor 2c, and the time delay of the time relays is set to be 15s.
Normally open contacts of time relays on the voltage monitoring contactor 1C and the voltage monitoring contactor 2C are connected with a voltage monitoring contactor 3C connected with a standby power supply; the voltage monitoring contactor 3C is provided with an intermediate relay. And multiple motor frequency converters to be switched are interlocked, and an auxiliary contactor KM is arranged between the multiple motor frequency converters to be switched.
And a power switch 11BK, a working power supply alternating current contactor 11QC and a working power supply air switch 11QF are sequentially arranged on a connecting line between the motor frequency converter to be switched and the working power supply, and a connecting point of the voltage monitoring contactor 1c is positioned on the connecting line between the working power supply alternating current contactor 11QC and the working power supply air switch 11 QF.
The standby power supply is connected with a standby power supply controller, and a control power supply of the standby power supply controller is taken from a secondary circuit of the isolation transformer. The low voltage ride through device outputs DC520V.
In order to prevent the coal feeder working power supply alternating current contactor from tripping due to instantaneous low voltage of a bus, a control power supply of the working power supply alternating current contactor 11QC is taken from a standby power supply; the voltage monitoring contactor 1C and the voltage monitoring contactor 2C are working power supply voltage monitoring contactors, if a working power supply main loop has a short-circuit fault or a power supply trips to cause low voltage, the voltage monitoring contactor 1C and the voltage monitoring contactor 2C lose power, after 0.15 second of delay, the voltage monitoring contactor 3C connected to a standby power supply is started, and when the voltage monitoring contactor 3C acts normally, low voltage protection is started to jump off a working power supply alternating current contactor 11QC and an auxiliary contactor KM; in an interlocking state, the auxiliary contactor KM loses power, a contact starts a standby power supply air switch 12QF, a standby power supply is automatically put into use, and the working power supply contactor 12KM is a common bus voltage monitoring time relay of a motor frequency converter to be switched, so that the interlocking open time is allowed to be more than 0.5 second and less than 6 seconds; according to the invention, a single frequency converter has a non-metallic short-circuit fault, the short-circuit current is small, and the power switch 11BK of the working power supply correspondingly connected with the frequency converter trips to remove the fault without influencing the operation of other frequency converters. The instantaneous metallic short-circuit fault of the motor frequency converter to be switched is large in short-circuit current, the power switch 11BK of the working power supply correspondingly connected with the motor frequency converter to be switched trips, meanwhile, the air switch 11QF of the working power supply correspondingly connected with the motor frequency converter to be switched trips, after 0.15 second, the low voltage acts, the working power supply contactor 12KM trips, the interlocked standby power supply is put into operation, and in the period, even if the low-penetration device is not put into operation, the AB/PF40 frequency converter can be guaranteed to be in voltage loss and then be started to normally operate.
When the system is less than 70 percent of Ue low voltage, the backup power supply voltage monitoring contactor 3C is also power-off, the working power supply is not operated at low voltage, the short-time low-voltage frequency converter can be restarted to normally operate by self power-off, when the power-off exceeds 1 second, the direct-current circuit of the frequency converter needs to be stabilized by a low-voltage ride-through device to normally operate, and the low-voltage resistance of the low-voltage ride-through device is 20 percent of Ue and 1S;60% ue, 6S. When the working power supply 400V system has instantaneous fault or the spare power automatic switching device is switched to cause instantaneous low voltage, even if the low voltage ride through device is not switched, the normal operation of the frequency converter can be ensured after the frequency converter is in voltage loss.
In summary, the power supply switching system can meet the requirement of stable operation of the system, and meanwhile, the fixed value setting such as the speed reduction time of the frequency converter and the safe input of a system voltage stabilizing device are paid attention to, so that the frequency converter is ensured not to have the abnormal operation working conditions of overvoltage and long-term low voltage, and the non-stop accidents of fuel loss and boiler MFT caused by the stop of the frequency converters of a plurality of coal feeders are avoided.
The invention relates to the technical field of power supply switching devices, which supplies power by setting a working power supply and a standby power supply; the working power supply is provided with two groups of voltage monitoring contactors; the standby power supply is provided with a voltage monitoring contactor; a working power supply contactor 12KM is arranged between the working power supply and the standby power supply; a common bus of a frequency converter power supply is connected to a low-voltage ride-through device; time relays are arranged on the two groups of voltage monitoring contactors arranged on the working power supply; the normally open contact of the time relay is connected with a voltage monitoring contactor 3C of the standby power supply, so that the boiler keeps an interlocking state; the invention can meet the requirement of stable operation of the system, ensure that the frequency converter does not have abnormal operation working conditions of overvoltage and long-term low voltage, and avoid fuel loss and boiler MFT non-stop accidents caused by the stop of the frequency converters of a plurality of coal feeders.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundary of the appended claims, or the equivalents of such scope and boundary.
Claims (10)
1. A power supply switching system of a frequency converter of a motor of a coal feeder is characterized by comprising a low-voltage ride-through device, a working power supply and a standby power supply;
the motor frequency converter to be switched is connected with a standby power supply through a low-voltage ride-through device, the motor frequency converter to be switched is connected with a working power supply through a control switch, a voltage monitoring contactor is arranged on a connecting wire of the motor frequency converter to be switched and the working power supply, a voltage monitoring contactor is arranged on an output wire of the standby power supply, and a working power supply contactor is arranged between the working power supply and the standby power supply.
2. The coal feeder motor frequency converter power supply switching system of claim 1, wherein every 8 frequency converters are arranged in one frequency converter cabinet.
3. The coal feeder motor frequency converter power switching system of claim 1, wherein a power utility bus of the motor frequency converter to be switched is connected to the low voltage ride through device.
4. The feeder motor frequency converter power switching system of claim 1, wherein the backup power source is a UPS uninterruptible power supply.
5. The coal feeder motor frequency converter power switching system of claim 1, wherein a backup power contactor and a backup power air switch are disposed on an output line of the backup power.
6. The feeder motor frequency converter power switching system of claim 1, wherein the control power source for the operating power source contactor is derived from a backup power source.
7. The coal feeder motor frequency converter power supply switching system according to claim 1, wherein two sets of voltage monitoring contactors are arranged on a connection line between a motor frequency converter to be switched and a working power supply, and a time relay is arranged on each of the two sets of voltage monitoring contactors.
8. The feeder motor frequency converter power switching system of claim 7, wherein the time delay of the time relay is set to 15s.
9. The feeder motor frequency converter power switching system of claim 7, wherein the normally open contacts of the two sets of voltage monitoring contactors are connected to voltage monitoring contactors connected to a backup power source.
10. The coal feeder motor frequency converter power switching system according to claim 1, characterized in that a power switch, a working power supply ac contactor and a working power supply air switch are sequentially disposed on a connection line between the motor frequency converter to be switched and the working power supply, and a connection point of the voltage monitoring contact is located on the connection line between the working power supply ac contactor and the working power supply air switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211292094.5A CN115514083A (en) | 2022-10-20 | 2022-10-20 | Coal feeder motor converter power switching system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211292094.5A CN115514083A (en) | 2022-10-20 | 2022-10-20 | Coal feeder motor converter power switching system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115514083A true CN115514083A (en) | 2022-12-23 |
Family
ID=84509505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211292094.5A Pending CN115514083A (en) | 2022-10-20 | 2022-10-20 | Coal feeder motor converter power switching system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115514083A (en) |
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2022
- 2022-10-20 CN CN202211292094.5A patent/CN115514083A/en active Pending
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