CN203984225U - A kind of frequency converter low voltage ride through device - Google Patents
A kind of frequency converter low voltage ride through device Download PDFInfo
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- CN203984225U CN203984225U CN201420376645.0U CN201420376645U CN203984225U CN 203984225 U CN203984225 U CN 203984225U CN 201420376645 U CN201420376645 U CN 201420376645U CN 203984225 U CN203984225 U CN 203984225U
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- frequency converter
- electromagnetic contactor
- circuit breaker
- fuse
- current sensor
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Abstract
The utility model discloses a kind of frequency converter low voltage ride through device, belong to the low voltage crossing technical field of frequency converter, this device guarantees that when system voltage falls rotating speed, power, the torque of frequency converter and dragging motor system thereof is constant.Electromagnetic contactor KM3 is connected with a current sensor CT1 with direct current end of incoming cables respectively, the input of BOOST boost inductance L2 is connected with two current sensor CT1 respectively, circuit breaker SW1 is connected with one end of electromagnetic contactor KM2 with the electromagnetic contactor KM1 being connected in parallel with interchange end of incoming cables respectively, filter reactor L1 is connected with the other end of electromagnetic contactor KM2 with the electromagnetic contactor KM1 being connected in parallel with three-phase commutation bridge TBRG respectively, three-phase commutation bridge TBRG is connected with another current sensor CT1, insulated gate bipolar transistor IGBT respectively with current sensor CT2, diode D2, three-phase commutation bridge TBRG is connected with BOOST boost inductance L2.The utility model is mainly used in frequency converter low voltage crossing technology.
Description
Technical field
The utility model relates to the low voltage crossing technical field of frequency converter, relates in particular to a kind of frequency converter low voltage ride through device.
Background technology
Along with the development of power electronic technology, frequency converter is accurate with its speed governing, uses simply, protects the feature such as complete to be widely used in the subsidiary engine speed-adjusting and control systems such as oil well, power plant, steel mill.The application of frequency converter has not only reduced the users' such as oil well, power plant, steel mill energy consumption, has also improved the automaticity of equipment simultaneously.Due to the application of power electronic device, frequency converter is all with undervoltage tripping protection, and the fluctuation of line voltage tends to bring the out of service of frequency converter, thus the expansion causing the accident.
There are successively a lot of accidents that caused unit chaser by system low-voltage fault in oil well, power plant, steel mill etc. in recent years.In this type of accident; the inside of oil well, power plant, steel mill or external fault (thunderbolt, electric equipment short circuit, ground connection etc.); cause that line voltage falls in short-term, the amplitude of falling surpasses 15%, the duration is shorter, the generation of this type of fault; originally should not cause exiting of subsidiary engine; but because the frequency converter equipment of its crucial subsidiary engine does not possess low-voltage function, triggered the under-voltage protection that subsidiary engine drags frequency converter, frequency converter locking output; subsidiary engine is shut down, and has finally caused the chaser of group of motors.Unplanned chaser between this type of age at failure, affect on the one hand continuity and the economy that oil well, power plant, steel mill etc. produce, and cause the motor devices such as oil well, power plant, steel mill or generating equipment to damage, can further to electric power system, impact on the other hand, aggravate system failure degree, have a strong impact on the safe and stable operation of electric power system.
For example, the problem of chaser is caused in power plant by voltage dip, caused the great attention of grid company, and State Grid Corporation of China and Southern Power Grid Company control centre have all issued the notice to set auxiliary machinery potential safety hazard investigation.First Northeast China Power Grid company has proposed concrete requirement to important operation subsidiary engine low voltage ride-through capabilities such as power plant: the frequency conversion dragging system that requires Important Auxiliary equipment, at system voltage, drop to 20% and lasting 5s in the situation that, possess complete reliable low voltage ride-through capability, while guaranteeing the system failure, generating set does not trip because low voltage ride-through capability is not enough.
Utility model content
The utility model is in order to solve the deficiency of existing frequency converter low voltage crossing, and a kind of constant a kind of frequency converter low voltage ride through device of rotating speed, power, torque that guarantees frequency converter and dragging motor system thereof when system voltage falls is provided.
To achieve these goals, the utility model is by the following technical solutions:
A kind of frequency converter low voltage ride through device, comprise: direct current end of incoming cables, exchange end of incoming cables, frequency converter 1 DC terminal, frequency converter 2 DC terminals, circuit breaker SW1, electromagnetic contactor KM1, electromagnetic contactor KM2, electromagnetic contactor KM3, filter reactor L1, three-phase commutation bridge TBRG, two current sensor CT1, current sensor CT2, BOOST boost inductance L2, insulated gate bipolar transistor IGBT, current sensor CT2, diode D1, diode D2, diode D3, fuse FU1, fuse FU2, fuse FU3, fuse FU4.Circuit breaker SW2, circuit breaker SW3, IGBT adaptation board drive box and Signal Regulation plate, direct current end of incoming cables is connected on one end of electromagnetic contactor KM3, and the other end of electromagnetic contactor KM3 is connected on one end of a current sensor CT1, and the other end of this current sensor CT1 is connected on the input of BOOST boost inductance L2, exchanging end of incoming cables is connected on one end of circuit breaker SW1, the other end of circuit breaker SW1 is connected on one end of the electromagnetic contactor KM1 that is connected in parallel and electromagnetic contactor KM2, the electromagnetic contactor KM1 being connected in parallel and the other end of electromagnetic contactor KM2 are connected on the input of filter reactor L1, and the output of filter reactor L1 is connected on the input of three-phase commutation bridge TBRG, the cathode output end of three-phase commutation bridge TBRG is connected on one end of another current sensor CT1, and the other end of this current sensor CT1 is connected on the input of BOOST boost inductance L2, the cathode output end of three-phase commutation bridge TBRG is connected on the negative input of insulated gate bipolar transistor IGBT, and the output of BOOST boost inductance L2 is connected on the electrode input end of insulated gate bipolar transistor IGBT, the cathode output end of insulated gate bipolar transistor IGBT is connected on one end of current sensor CT2, the other end of current sensor CT2 is connected on the positive terminal of diode D1, the negative pole end of diode D1 is connected on the positive terminal of diode D3, delivery outlet of negative pole end of diode D3 is connected on one end of fuse FU1, No. two delivery outlets of negative pole end of diode D3 are connected on one end of fuse FU3, the cathode output end of insulated gate bipolar transistor IGBT is connected on the negative pole end of diode D2, the positive terminal of diode D2 is connected on one end of fuse FU2 and one end of fuse FU4, the other end of fuse FU1 is connected on the electrode input end of circuit breaker SW2, the other end of fuse FU2 is connected on the negative input of circuit breaker SW2, the other end of fuse FU3 is connected on the electrode input end of circuit breaker SW3, and the other end of fuse FU4 is connected on the negative input of circuit breaker SW3, the cathode output end of circuit breaker SW2 is connected to the positive terminal of frequency converter 1 DC terminal, and the cathode output end of circuit breaker SW2 is connected to the negative pole end of frequency converter 1 DC terminal, the cathode output end of circuit breaker SW3 is connected to the positive terminal of frequency converter 2 DC terminals, and the cathode output end of circuit breaker SW3 is connected to the negative pole end of frequency converter 2 DC terminals, each interface on bipolar transistor IGBT drives the corresponding connection of each interface on box with IGBT adaptation board, and IGBT adaptation board drives the debugging interface on box to be connected with Signal Regulation plate.
The control target of the low voltage ride through device of this programme is for to guarantee that when system voltage falls rotating speed, power, the torque of frequency converter and dragging motor system thereof are constant.This device can be realized and exchange 380V and direct current 220V input double copies; when ac bus breaks down and opens circuit or voltage drops to lower than 20% time; device still can receive the direct current 220V power supply that plant battery group provides; guarantee that the voltage stabilization of exporting after its BOOST boosts is reliable; the power demands of satisfied be with frequency converter; and then ensure subsidiary engine and generating set continuous and steady operation, guarantee machine net safety.
Its control principle is as follows: under the normal state of system voltage, normal and the frequency converter of frequency converter busbar voltage is normally worked, electric energy is sent into frequency converter AC input terminal by exchanging power transmission loop, meet the servo condition of low voltage ride through device, by the central control unit in device, to performance elements such as circuit breaker, motor switches (electromagnetic contactor KM1, electromagnetic contactor KM2, electromagnetic contactor KM3), send the order of closing a floodgate, now DC loop, in servo condition, does not participate in frequency converter operation.
When system voltage falls, install built-in control system and real-time monitor this voltage and fall trend, be instantly brought down below the rated voltage of requirement, install instantaneous putting into operation.By the BOOST loop of boosting, the alternating voltage falling is risen to 500V direct voltage, if alternating voltage occurs opening circuit or falls too low (lower than normal value 20% time) during this period, device will access standby direct current 220V power supply automatically, by the BOOST loop of boosting, risen to 500V, DC bus by frequency converter is to inverter supply, it 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, install out of servicely, the loop of the boosting state of deactivating, returns to servo condition, the power supply of frequency converter is still provided by three-phase alternating current power transmission loop.
As preferably, between the cathode output end of three-phase commutation bridge TBRG and the cathode output end of three-phase commutation bridge TBRG, be connected with thin-film capacitor C1, between the cathode output end of insulated gate bipolar transistor IGBT and the cathode output end of insulated gate bipolar transistor IGBT, be connected with thin-film capacitor C2, metal film capacitor C 3, metal film capacitor C 4 and metal film capacitor C 5, and thin-film capacitor C2, metal film capacitor C 3, metal film capacitor C 4 and metal film capacitor C 5 are for being connected in parallel.This structure has filter action, good stability.
As preferably, on the line of electromagnetic contactor KM3 and current sensor CT1, be connected in series with resistance CR1, on wherein first-phase output in the three-phase output end of electromagnetic contactor KM2 and the line of filter reactor L1, be connected in series with another resistance CR1, on the wherein third phase output in the three-phase output end of electromagnetic contactor KM2 and the line of filter reactor L1, be connected in series with resistance CR3.Sort circuit has defencive function, and good stability is safe.
The utility model can reach following effect:
1, the utility model guarantees that when system voltage falls rotating speed, power, the torque of frequency converter and dragging motor system thereof are constant.Can realize and exchange 380V and direct current 220V input double copies; when ac bus breaks down and opens circuit or voltage drops to lower than 20% time; device still can receive the direct current 220V power supply that plant battery group provides; guarantee that the voltage stabilization of exporting after its BOOST boosts is reliable; the power demands of satisfied be with frequency converter; and then ensure subsidiary engine and generating set continuous and steady operation, guarantee machine net safety.
2, the utility model safe and reliable, highly sensitive, have self-checking function, wiring simple.
3, this device is to use when low-voltage abnormal conditions appear in electrical network, the overwhelming majority time is standby, in topology, increased voltage counnter attack unit, make its output than the slightly low 6～8V of load direct current both end voltage, like this when electrical network is normal, the power of frequency converter is supplied with by ac bus, can greatly improve the useful life of device.
4, AC and DC input power double copies.The present invention can receive the power supply input that exchanges 380V and direct current 220V simultaneously, and the loop of boosting of the BOOST by is below promoted to direct current 520V by voltage, and two-way power supply is standby each other, and priority can arrange.Direct current 220V power supply directly accesses batteries in oil well, power plant, steel mill etc., for the normal work of low voltage ride through device increases defence line one, can guarantee more reliably the crucial subsidiary engine safe and stable operation of the units such as oil well, power plant, steel mill.
5, adopt high-effect, non-crystaline amorphous metal material inductance.The magnetic core of inductance used herein is amorphous alloy core, and the use of this new material can improve inductance usefulness greatly, for high frequency provides technical support, has dwindled greatly volume simultaneously, is 1/3rd of conventional high frequency, large sense value reactor volume.
6, adopt high pressure resistant, high ripple current ability metal film electric capacity.This device is used up-to-date capacitance technology, and its body can bear the voltage up to 1100V.Its Acceptable life, in the time of 85 degrees Celsius, reaches more than 100,000 hours, effective guarantee the reliability of system.
7, perfect protection mechanism.This installs self and is with overcurrent, short circuit, lightning protection, surging prevention, has self check, reset, emergent stopping, and energy is from releasing control unit function.There is running status, the indicating status such as malfunction.Can greatly improve overall performance and the security reliability of device.
Accompanying drawing explanation
Fig. 1 is a kind of circuit theory syndeton schematic diagram of the present utility model.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: a kind of frequency converter low voltage ride through device, shown in Figure 1, comprise: direct current end of incoming cables, exchange end of incoming cables, frequency converter 1 DC terminal, frequency converter 2 DC terminals, circuit breaker SW1, electromagnetic contactor KM1, electromagnetic contactor KM2, electromagnetic contactor KM3, filter reactor L1, three-phase commutation bridge TBRG, two current sensor CT1, current sensor CT2, BOOST boost inductance L2, insulated gate bipolar transistor IGBT, current sensor CT2, diode D1, diode D2, diode D3, fuse FU1, fuse FU2, fuse FU3, fuse FU4.Circuit breaker SW2, circuit breaker SW3, IGBT adaptation board drive box and Signal Regulation plate, direct current end of incoming cables is connected on one end of electromagnetic contactor KM3, and the other end of electromagnetic contactor KM3 is connected on one end of a current sensor CT1, and the other end of this current sensor CT1 is connected on the input of BOOST boost inductance L2, exchanging end of incoming cables is connected on one end of circuit breaker SW1, the other end of circuit breaker SW1 is connected on one end of the electromagnetic contactor KM1 that is connected in parallel and electromagnetic contactor KM2, the electromagnetic contactor KM1 being connected in parallel and the other end of electromagnetic contactor KM2 are connected on the input of filter reactor L1, and the output of filter reactor L1 is connected on the input of three-phase commutation bridge TBRG, the cathode output end of three-phase commutation bridge TBRG is connected on one end of another current sensor CT1, and the other end of this current sensor CT1 is connected on the input of BOOST boost inductance L2, the cathode output end of three-phase commutation bridge TBRG is connected on the negative input of insulated gate bipolar transistor IGBT, and the output of BOOST boost inductance L2 is connected on the electrode input end of insulated gate bipolar transistor IGBT, the cathode output end of insulated gate bipolar transistor IGBT is connected on one end of current sensor CT2, the other end of current sensor CT2 is connected on the positive terminal of diode D1, the negative pole end of diode D1 is connected on the positive terminal of diode D3, delivery outlet of negative pole end of diode D3 is connected on one end of fuse FU1, No. two delivery outlets of negative pole end of diode D3 are connected on one end of fuse FU3, the cathode output end of insulated gate bipolar transistor IGBT is connected on the negative pole end of diode D2, the positive terminal of diode D2 is connected on one end of fuse FU2 and one end of fuse FU4, the other end of fuse FU1 is connected on the electrode input end of circuit breaker SW2, the other end of fuse FU2 is connected on the negative input of circuit breaker SW2, the other end of fuse FU3 is connected on the electrode input end of circuit breaker SW3, and the other end of fuse FU4 is connected on the negative input of circuit breaker SW3, the cathode output end of circuit breaker SW2 is connected to the positive terminal of frequency converter 1 DC terminal, and the cathode output end of circuit breaker SW2 is connected to the negative pole end of frequency converter 1 DC terminal, the cathode output end of circuit breaker SW3 is connected to the positive terminal of frequency converter 2 DC terminals, and the cathode output end of circuit breaker SW3 is connected to the negative pole end of frequency converter 2 DC terminals, each interface on bipolar transistor IGBT drives the corresponding connection of each interface on box with IGBT adaptation board, and IGBT adaptation board drives the debugging interface on box to be connected with Signal Regulation plate.
Between the cathode output end of three-phase commutation bridge TBRG and the cathode output end of three-phase commutation bridge TBRG, be connected with thin-film capacitor C1, between the cathode output end of insulated gate bipolar transistor IGBT and the cathode output end of insulated gate bipolar transistor IGBT, be connected with thin-film capacitor C2, metal film capacitor C 3, metal film capacitor C 4 and metal film capacitor C 5, and thin-film capacitor C2, metal film capacitor C 3, metal film capacitor C 4 and metal film capacitor C 5 are for being connected in parallel.
On the line of electromagnetic contactor KM3 and current sensor CT1, be connected in series with resistance CR1, on wherein first-phase output in the three-phase output end of electromagnetic contactor KM2 and the line of filter reactor L1, be connected in series with another resistance CR1, on the wherein third phase output in the three-phase output end of electromagnetic contactor KM2 and the line of filter reactor L1, be connected in series with resistance CR3.
The control target of the low voltage ride through device of the present embodiment is for to guarantee that when system voltage falls rotating speed, power, the torque of frequency converter and dragging motor system thereof are constant.This device can be realized and exchange 380V and direct current 220V input double copies; when ac bus breaks down and opens circuit or voltage drops to lower than 20% time; device still can receive the direct current 220V power supply that plant battery group provides; guarantee that the voltage stabilization of exporting after its BOOST boosts is reliable; the power demands of satisfied be with frequency converter; and then ensure subsidiary engine and generating set continuous and steady operation, guarantee machine net safety.
Its control principle is as follows: under the normal state of system voltage, normal and the frequency converter of frequency converter busbar voltage is normally worked, electric energy is sent into frequency converter AC input terminal by exchanging power transmission loop, meet the servo condition of low voltage ride through device, by the central control unit in device, to performance elements such as circuit breaker, motor switches (electromagnetic contactor KM1, electromagnetic contactor KM2, electromagnetic contactor KM3), send the order of closing a floodgate, now DC loop, in servo condition, does not participate in frequency converter operation.
When system voltage falls, install built-in control system and real-time monitor this voltage and fall trend, be instantly brought down below the rated voltage of requirement, install instantaneous putting into operation.By the BOOST loop of boosting, the alternating voltage falling is risen to 500V direct voltage, if alternating voltage occurs opening circuit or falls too low (lower than normal value 20% time) during this period, device will access standby direct current 220V power supply automatically, by the BOOST loop of boosting, risen to 500V, DC bus by frequency converter is to inverter supply, it 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, install out of servicely, the loop of the boosting state of deactivating, returns to servo condition, the power supply of frequency converter is still provided by three-phase alternating current power transmission loop.
Four kinds of mode of operations below the present embodiment may occur in running: operational mode, Auto-Sensing Mode, shutdown mode, fault mode.
(1) operational mode
Device has two kinds of operating states under operational mode: the operating state of boosting, servo operating state." operating state of boosting " be finger device when electric network source falls, low voltage ride through device can carry out BOOST boost operations by the interchange of input or direct voltage, exports to frequency changer direct current bus galvanic current and presses, and maintains frequency converter and normally works; " servo operating state " refers to while recovering normal when electric network source is normal or from abnormality, low voltage ride through device is not frequency converter output DC power supply, and electric energy directly offers frequency converter by supply and AC bus in oil well, power plant, steel mill etc. and exchanges input.
(2) Auto-Sensing Mode,
For the reliable and stable operation of assurance device, device can be carried out following two kinds of self checks operation:
1) power-on self-test: after device has powered on machine, A.C. contactor closure, system will be carried out power-on self-test.Power-on self-test is mainly for every control function of control circuit board, and self check time span was 6 seconds, if function normally will enter running status automatically, " running indicator " keeps lighting; If system has fault, disconnect and exchange input contactor, " trouble light " on cabinet door lights and exports simultaneously fault-signal.
2) manually self check: under servo mode of operation, press " self check " button of lower cabinet body main entrance, device enters manual self check state, 30 seconds of time remaining.During this, device will automatically perform DC boosting operation, if reached expectation threshold voltage within the time of setting, represent that self check is normal, and device will exit the mode of operation of boosting, and keep servo mode of operation; If self check has fault, device will be controlled and exchange the disconnection of input contactor, and " trouble light " lights and export simultaneously fault-signal.
(3) shutdown mode
Shutdown mode refers to that low voltage ride through device, in stopping output, no longer monitors, follows the trail of the state of electrical network and load condition.Following situation system can enter into stopped status:
1) without three-phase alternating-current supply or DC power supply input; When external three-phase input AC 380V power supply or the equal power down of direct current input 220V power supply, the automatic judgement of system does not possess condition of work, will enter into stopped status;
2) when powering on for the first time, a kind of state that system advances in self check;
3) while pressing emergency button switch, low voltage ride through device can automatically perform and block power conversion unit pulse, jump A.C. contactor, lights halt indicator, and system enters stopped status.
(4) fault mode
Fault mode refers to when low voltage ride through device breaks down, and system enters a kind of pattern of self-protection automatically, now by the output of locking direct current, can not exert an influence to the normal work of frequency converter.When device breaks down, system can be carried out following control logic instruction: block power device trigger impulse, jump major loop A.C. contactor, light trouble light, export fault-signal, system enters fault-alarming state.
Failure elimination has two kinds of modes:
1) if fix a breakdown, can eliminate malfunction by " reset button " on lower cabinet body, system will automatically access main circuit power in 5 seconds, and successively experience stopped status, self check state, normally after again trial enter servo operation pattern;
2) if fault is unmanned for getting involved after occurring, system can attempt entering servo mode of operation after 5 minutes, if fault is not got rid of, system can again enter fault mode after 5 minutes, if continuous 5 times all enter fault mode, system can stop attempting entering servo mode of operation, keeps fault mode, until fault is got rid of, can eliminate malfunction by " reset button ".
The present embodiment disposes perfect defencive function, and protection range juxtaposition, does not have dead band, can guarantee the system safety under various failure conditions.
Described by reference to the accompanying drawings execution mode of the present utility model above, but not limited by above-described embodiment while realizing, those of ordinary skills can make a variety of changes within the scope of the appended claims or revise.
Claims (3)
1. a frequency converter low voltage ride through device, it is characterized in that, comprise: direct current end of incoming cables, exchange end of incoming cables, frequency converter 1 DC terminal, frequency converter 2 DC terminals, circuit breaker SW1, electromagnetic contactor KM1, electromagnetic contactor KM2, electromagnetic contactor KM3, filter reactor L1, three-phase commutation bridge TBRG, two current sensor CT1, current sensor CT2, BOOST boost inductance L2, insulated gate bipolar transistor IGBT, current sensor CT2, diode D1, diode D2, diode D3, fuse FU1, fuse FU2, fuse FU3, fuse FU4, circuit breaker SW2, circuit breaker SW3, IGBT adaptation board drives box and Signal Regulation plate,
Direct current end of incoming cables is connected on one end of electromagnetic contactor KM3, and the other end of electromagnetic contactor KM3 is connected on one end of a current sensor CT1, and the other end of this current sensor CT1 is connected on the input of BOOST boost inductance L2;
Exchanging end of incoming cables is connected on one end of circuit breaker SW1, the other end of circuit breaker SW1 is connected on one end of the electromagnetic contactor KM1 that is connected in parallel and electromagnetic contactor KM2, the electromagnetic contactor KM1 being connected in parallel and the other end of electromagnetic contactor KM2 are connected on the input of filter reactor L1, and the output of filter reactor L1 is connected on the input of three-phase commutation bridge TBRG;
The cathode output end of three-phase commutation bridge TBRG is connected on one end of another current sensor CT1, and the other end of this current sensor CT1 is connected on the input of BOOST boost inductance L2; The cathode output end of three-phase commutation bridge TBRG is connected on the negative input of insulated gate bipolar transistor IGBT, and the output of BOOST boost inductance L2 is connected on the electrode input end of insulated gate bipolar transistor IGBT;
The cathode output end of insulated gate bipolar transistor IGBT is connected on one end of current sensor CT2, the other end of current sensor CT2 is connected on the positive terminal of diode D1, the negative pole end of diode D1 is connected on the positive terminal of diode D3, delivery outlet of negative pole end of diode D3 is connected on one end of fuse FU1, No. two delivery outlets of negative pole end of diode D3 are connected on one end of fuse FU3, the cathode output end of insulated gate bipolar transistor IGBT is connected on the negative pole end of diode D2, the positive terminal of diode D2 is connected on one end of fuse FU2 and one end of fuse FU4,
The other end of fuse FU1 is connected on the electrode input end of circuit breaker SW2, the other end of fuse FU2 is connected on the negative input of circuit breaker SW2, the other end of fuse FU3 is connected on the electrode input end of circuit breaker SW3, and the other end of fuse FU4 is connected on the negative input of circuit breaker SW3;
The cathode output end of circuit breaker SW2 is connected to the positive terminal of frequency converter 1 DC terminal, and the cathode output end of circuit breaker SW2 is connected to the negative pole end of frequency converter 1 DC terminal; The cathode output end of circuit breaker SW3 is connected to the positive terminal of frequency converter 2 DC terminals, and the cathode output end of circuit breaker SW3 is connected to the negative pole end of frequency converter 2 DC terminals;
Each interface on bipolar transistor IGBT drives the corresponding connection of each interface on box with IGBT adaptation board, and IGBT adaptation board drives the debugging interface on box to be connected with Signal Regulation plate.
2. a kind of frequency converter low voltage ride through device according to claim 1, it is characterized in that, between the cathode output end of three-phase commutation bridge TBRG and the cathode output end of three-phase commutation bridge TBRG, be connected with thin-film capacitor C1, between the cathode output end of insulated gate bipolar transistor IGBT and the cathode output end of insulated gate bipolar transistor IGBT, be connected with thin-film capacitor C2, metal film capacitor C 3, metal film capacitor C 4 and metal film capacitor C 5, and thin-film capacitor C2, metal film capacitor C 3, metal film capacitor C 4 and metal film capacitor C 5 are for being connected in parallel.
3. a kind of frequency converter low voltage ride through device according to claim 1 and 2, it is characterized in that, on the line of electromagnetic contactor KM3 and current sensor CT1, be connected in series with resistance CR1, on wherein first-phase output in the three-phase output end of electromagnetic contactor KM2 and the line of filter reactor L1, be connected in series with another resistance CR1, on the wherein third phase output in the three-phase output end of electromagnetic contactor KM2 and the line of filter reactor L1, be connected in series with resistance CR3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201420376645.0U CN203984225U (en) | 2014-07-09 | 2014-07-09 | A kind of frequency converter low voltage ride through device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420376645.0U CN203984225U (en) | 2014-07-09 | 2014-07-09 | A kind of frequency converter low voltage ride through device |
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| CN203984225U true CN203984225U (en) | 2014-12-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106329534A (en) * | 2015-06-16 | 2017-01-11 | 中国石油天然气股份有限公司 | Method, device and system for maintaining outlet voltage of distribution network |
| CN117674238A (en) * | 2024-01-31 | 2024-03-08 | 啸驰电气股份有限公司 | Energy storage frequency converter |
-
2014
- 2014-07-09 CN CN201420376645.0U patent/CN203984225U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106329534A (en) * | 2015-06-16 | 2017-01-11 | 中国石油天然气股份有限公司 | Method, device and system for maintaining outlet voltage of distribution network |
| CN106329534B (en) * | 2015-06-16 | 2019-06-11 | 中国石油天然气股份有限公司 | The line voltage of distribution network maintains method and apparatus and system |
| CN117674238A (en) * | 2024-01-31 | 2024-03-08 | 啸驰电气股份有限公司 | Energy storage frequency converter |
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Address after: 324100 No. 5, lotus flower pond, Chengxi Industrial Park, Jiangshan Economic Development Zone, Quzhou, Zhejiang Patentee after: Zhejiang Rui Fan Technology Co., Ltd. Address before: 324100 No. 5, lotus flower pond, Chengnan Industrial Park, Jiangshan Economic Development Zone, Quzhou, Zhejiang Patentee before: ZHEJIANG RUIFAN POWER TECHNOLOGY CO., LTD. |
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Granted publication date: 20141203 Termination date: 20200709 |