CN203466765U - Boiler air pre-heater frequency converter based on low-voltage ride-through device - Google Patents
Boiler air pre-heater frequency converter based on low-voltage ride-through device Download PDFInfo
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- CN203466765U CN203466765U CN201320336661.2U CN201320336661U CN203466765U CN 203466765 U CN203466765 U CN 203466765U CN 201320336661 U CN201320336661 U CN 201320336661U CN 203466765 U CN203466765 U CN 203466765U
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Abstract
The utility model discloses a boiler air pre-heater frequency converter based on a low-voltage ride-through device, comprising A-phase, B-phase and C-phase voltages, an uninterruptible power supply (UPS), a low-voltage ride-through device, a frequency converter and a motor, wherein the A-phase, B-phase and C-phase voltages are connected with the low-voltage ride-through device, the low-voltage ride-through device is connected with the frequency converter, the frequency converter is connected with the motor, and the uninterruptible power supply (UPS) is connected with the frequency converter. As low-voltage disturbance resisting equipment is additionally arranged on a direct-current part of the frequency converter, the boiler air pre-heater frequency converter based on the low-voltage ride-through device has the following advantages the input power supply voltage of the low-voltage frequency converter can be monitored in real time, the output torque and the rotation speed of the low-voltage frequency converter are ensured to be stable when the system voltage drops fast, an independent device can be arranged on site, power and control cables do not need to be re-laid, installation is convenient, and the engineering cost is 30% lower than that of a storage battery scheme.
Description
Technical field
The utility model relates to a kind of boiler air preheater frequency converter based on low voltage ride through device.
Background technology
Frequency converter electrical source of power and control power supply are often taken from the service power of power plant, when there is " low voltage crossing " in service power, frequency converter can effectively not escape system transient modelling fault due to the output of low-voltage quick lock, can not meet the needs of power grid operation.Only northeast net causes generating set Important Auxiliary equipment frequency converter low-voltage lockout protection action with regard to there is in succession number cause " low voltage crossing "; locking output is stopped transport Important Auxiliary equipment equipment; chain promoter all flames lost protection (MFT) is moved, and finally causes the accident of the unplanned stoppage in transit of generating set.Frequency converter intermediate dc link installs batteries scheme additional and has 100% power supply reliability, but its shortcoming is that retrofit work amount is larger, except purchasing integrated system, also need to purchase power cable, control feed cable and control the fast cutting apparatus of power supply and carry out supporting installation, installation and line service amount are larger.
Summary of the invention
Adverse effect to low voltage ride through device operation when the technical problems to be solved in the utility model is to provide a kind of effectively resolution system " low voltage crossing " to auxiliary bus bar, guarantee the safe operation of Important Auxiliary equipment frequency converter, improve operating unit and network system transient stability, have and can be equipped with on the spot independently device, do not need again to lay power, control cables, easy for installation, project cost is than the low more than 30% boiler air preheater frequency converter based on low voltage ride through device of storage battery scheme.
For addressing the above problem, the utility model adopts following technical scheme: a kind of boiler air preheater frequency converter based on low voltage ride through device, comprise ABC three-phase voltage, uninterrupted power supply UPS, low voltage ride through device, frequency converter and motor, described ABC three-phase voltage is connected with low voltage ride through device, described low voltage ride through device is connected with frequency converter, described frequency converter is connected with motor, and described uninterrupted power supply UPS is connected with frequency converter.
As preferably, described low voltage ride through device comprises switch, electric capacity, inductance and power electronic device IGBT, described switch comprises hand switch Q, circuit breaker Q F1, motor switch KM2, motor switch KM1 and Fuse Type switch FU1, described electric capacity comprises capacitor C 1, capacitor C 2, capacitor C 3 and capacitor C 4, and described inductance comprises inductance L 1 and inductance L 2.
As preferably, described capacitor C 1 and capacitor C 2 are arranged between inductance L 1 and inductance L 2, described capacitor C 3 and capacitor C 4 are arranged between Fuse Type switch FU1 and power electronic device IGBT, described hand switch Q is connected with frequency converter, described motor switch KM1 is arranged between circuit breaker Q F1 and inductance L 1, described motor switch KM2 is arranged between circuit breaker Q F1 and inductance L 1, and described power electronic device IGBT is bipolar transistor.
The beneficial effect of the boiler air preheater frequency converter of the utility model based on low voltage ride through device is: because the described boiler air preheater frequency converter based on low voltage ride through device has adopted frequency converter direct current component to install anti-low pressure disturbance equipment additional, having can Real-Time Monitoring low voltage ride through device input supply voltage, when system voltage falls fast, guarantee the stable of low voltage ride through device output torque and rotational speed, can be equipped with on the spot independently device, do not need again to lay power, control cables, easy for installation, project cost is than low more than 30% advantage of storage battery scheme.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the boiler air preheater frequency converter of the utility model based on low voltage ride through device.
Embodiment
Consult shown in Fig. 1, a kind of boiler air preheater frequency converter based on low voltage ride through device, comprise ABC three-phase voltage, uninterrupted power supply UPS, low voltage ride through device, frequency converter and motor, described ABC three-phase voltage is connected with low voltage ride through device, described low voltage ride through device is connected with frequency converter, described frequency converter is connected with motor, and described uninterrupted power supply UPS is connected with frequency converter.
Described low voltage ride through device comprises switch, electric capacity, inductance and power electronic device IGBT, described switch comprises hand switch Q, circuit breaker Q F1, motor switch KM2, motor switch KM1 and Fuse Type switch FU1, described electric capacity comprises capacitor C 1, capacitor C 2, capacitor C 3 and capacitor C 4, and described inductance comprises inductance L 1 and inductance L 2.Described capacitor C 1 and capacitor C 2 are arranged between inductance L 1 and inductance L 2, described capacitor C 3 and capacitor C 4 are arranged between Fuse Type switch FU1 and power electronic device IGBT, described hand switch Q is connected with frequency converter, described motor switch KM1 is arranged between circuit breaker Q F1 and inductance L 1, described motor switch KM2 is arranged between circuit breaker Q F1 and inductance L 1, and described power electronic device IGBT is bipolar transistor.
When low voltage ride through device normally moves, hand switch Q, circuit breaker Q F1, motor switch KM1 and Fuse Type switch FU1 are all in closure state, and KM2 disconnects after completing pre-charging functions, out of service.Under the normal state of system voltage, electric energy is sent into frequency converter AC input terminal by bypass channel, and the power electronic device IGBT in ILP device, all in bypass condition, does not participate in device operation.At system voltage, fall, and then while causing direct voltage that in capacitor C 1/ capacitor C 2, rectification obtains to fall, the built-in control system of ILP device real-time monitors this voltage and falls trend, put into operation fast in the BOOST copped wave that inductance L 2 and IGBT the are formed loop of boosting, guarantee during A/B/C three-phase voltage falls, direct voltage in capacitor C 3/ capacitor C 4 is lifted high, is maintained to and can guarantees all constant voltage levvls of power converter output, motor torque, motor speed.At system voltage, fall end, system voltage recover normal after, IGBT is out of service, the BOOST state of deactivating in loop, the power supply of frequency converter is still provided by three-phase alternating current power transmission loop.In ILP device, the switching that exchanges power transmission passage and direct current power transmission passage is completed by power electronic device IGBT (IGBT), and switch and be less than 1us operate time, be seamless switching, to the stable operation of frequency converter, can not impact.
The beneficial effect of the boiler air preheater frequency converter of the utility model based on low voltage ride through device is: because the described boiler air preheater frequency converter based on low voltage ride through device has adopted frequency converter direct current component to install anti-low pressure disturbance equipment additional, having can Real-Time Monitoring low voltage ride through device input supply voltage, when system voltage falls fast, guarantee the stable of low voltage ride through device output torque and rotational speed, can be equipped with on the spot independently device, do not need again to lay power, control cables, easy for installation, project cost is than low more than 30% advantage of storage battery scheme.
The above, be only embodiment of the present utility model, but protection range of the present utility model is not limited to this, and any variation of expecting without creative work or replacement, within all should being encompassed in protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range that claims were limited.
Claims (3)
1. the boiler air preheater frequency converter based on low voltage ride through device, it is characterized in that: comprise ABC three-phase voltage, uninterrupted power supply UPS, low voltage ride through device, frequency converter and motor, described ABC three-phase voltage is connected with low voltage ride through device, described low voltage ride through device is connected with frequency converter, described frequency converter is connected with motor, and described uninterrupted power supply UPS is connected with frequency converter.
2. a kind of boiler air preheater frequency converter based on low voltage ride through device according to claim 1, it is characterized in that: described low voltage ride through device comprises switch, electric capacity, inductance and power electronic device IGBT, described switch comprises hand switch Q, circuit breaker Q F1, motor switch KM2, motor switch KM1 and Fuse Type switch FU1, described electric capacity comprises capacitor C 1, capacitor C 2, capacitor C 3 and capacitor C 4, and described inductance comprises inductance L 1 and inductance L 2.
3. a kind of boiler air preheater frequency converter based on low voltage ride through device according to claim 2, it is characterized in that: described capacitor C 1 and capacitor C 2 are arranged between inductance L 1 and inductance L 2, described capacitor C 3 and capacitor C 4 are arranged between Fuse Type switch FU1 and power electronic device IGBT, described hand switch Q is connected with frequency converter, described motor switch KM1 is arranged between circuit breaker Q F1 and inductance L 1, described motor switch KM2 is arranged between circuit breaker Q F1 and inductance L 1, and described power electronic device IGBT is bipolar transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320336661.2U CN203466765U (en) | 2013-06-13 | 2013-06-13 | Boiler air pre-heater frequency converter based on low-voltage ride-through device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320336661.2U CN203466765U (en) | 2013-06-13 | 2013-06-13 | Boiler air pre-heater frequency converter based on low-voltage ride-through device |
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| CN203466765U true CN203466765U (en) | 2014-03-05 |
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| CN201320336661.2U Expired - Lifetime CN203466765U (en) | 2013-06-13 | 2013-06-13 | Boiler air pre-heater frequency converter based on low-voltage ride-through device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105334412A (en) * | 2015-10-13 | 2016-02-17 | 国网安徽省电力公司 | Auxiliary machine high/low voltage rid-through test method based on voltage disturbance generator |
| CN106253734A (en) * | 2016-08-30 | 2016-12-21 | 保定卓尔电气有限公司 | A kind of low-voltage ride-through power source for frequency converter apparatus control system of improvement |
| CN107359639A (en) * | 2017-07-05 | 2017-11-17 | 国网天津市电力公司电力科学研究院 | A kind of method for improving air preheater low voltage ride-through capability |
-
2013
- 2013-06-13 CN CN201320336661.2U patent/CN203466765U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105334412A (en) * | 2015-10-13 | 2016-02-17 | 国网安徽省电力公司 | Auxiliary machine high/low voltage rid-through test method based on voltage disturbance generator |
| CN106253734A (en) * | 2016-08-30 | 2016-12-21 | 保定卓尔电气有限公司 | A kind of low-voltage ride-through power source for frequency converter apparatus control system of improvement |
| CN107359639A (en) * | 2017-07-05 | 2017-11-17 | 国网天津市电力公司电力科学研究院 | A kind of method for improving air preheater low voltage ride-through capability |
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