CN103606898B - Overvoltage protection device of converter of wind turbine generator set and converter - Google Patents
Overvoltage protection device of converter of wind turbine generator set and converter Download PDFInfo
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- CN103606898B CN103606898B CN201310646091.1A CN201310646091A CN103606898B CN 103606898 B CN103606898 B CN 103606898B CN 201310646091 A CN201310646091 A CN 201310646091A CN 103606898 B CN103606898 B CN 103606898B
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Abstract
The invention discloses an overvoltage protection device of a converter of a wind turbine generator set. The overvoltage protection device of the converter comprises an overvoltage detecting unit, a power supply generating unit and a fault transmitting unit, wherein the overvoltage detecting unit is connected with a bus of the converter. The power supply generating unit comprises an isolated power source which is used for conducting isolation and conversion of a 24V power supply of a power supply system of the converter and providing the power supply for the overvoltage detecting unit and the fault transmitting unit. The fault transmitting unit comprises a relay, the relay is connected with the fault output end of the overvoltage detecting unit and is driven by a mos transistor, and the relay driven by the mos transistor is used for being connected with a controller of the converter. The invention further discloses the converter of the wind turbine generator set, wherein the converter comprises the overvoltage protection device. According to the overvoltage protection device of the converter, due to the arrangement of the isolated power supply and the relay driven by the mos transistor, high-voltage energy of the converter is effectively prevented from being transmitted to a low-voltage side, and the safety of electrical part on the low-voltage side is guaranteed.
Description
Technical field
The present invention relates to current transformer field, in particular it relates to a kind of over-pressure safety device of wind power unit converter and change
Stream device.
Background technology
Wind-power electricity generation is one of green energy resource that country advocates, and wind power generating set is into electricity by the wind energy transformation of nature
The device of energy, the wind energy of nature promote the blade of wind power generating set to realize the absorption of wind energy, and blade drives electromotor to realize
Wind energy transformation is into electric energy；Because national grid has the regulation of frequency, phase place to grid-connected electric energy, and electric energy can not be reached by electromotor
The requirement of direct grid-connected, so must increase corresponding electrical equipment, i.e. current transformer between electromotor and electrical network and realizing and will send out
The energy of motor changes into the frequency of grid requirements, phase place etc. and can carry out the control such as active, idle；Blower fan operationally unsteady flow
Device can be good at controlling current transformer busbar voltage scope, may cause current transformer busbar voltage when current transformer is nonserviceabled
Raise, current transformer may be caused to be damaged when busbar voltage exceedes the limiting voltage of current transformer, so as to cause economic loss.
The circuit of the over-pressure safety device of existing current transformer is as shown in figure 1, the positive bus-bar of current transformer, negative busbar, GND are connected
+ the 600V of Overvoltage Protection Board, GND, -600V seams is connected to, X6-1 is connected to the 24V power ends of system, and X6-2 is connected to change
Stream controller over-voltage fault monitoring client, and when will work as positive pole line voltage and be increased to 700V, D8 to the D14 connected with busbar voltage is steady
Pressure diode current flow, the LEDs ON of optocoupler OK1, the receiving terminal of optocoupler will provide height in 5 feet after receiving this signal
Level signal provides current-variable controller, completes the monitoring of positive pole line voltage, and the R2 in Fig. 1 is current-limiting resistance, prevents optocoupler from sending out
Light pipe overcurrent damage；Negative busbar overvoltage protection motion flow can be obtained in the same manner.
When busbar voltage is reached between ± 690V- ± 700V, the anti-series Zener diode conducting being connected with bus,
Fault-signal is sent to current-variable controller by optocoupler, resistance (R1, R2) plays a part of current limliting with fine setting conducting voltage.Work as mother
Continue to rise when line voltage is reached between ± 690V- ± 700V, diode reverse breakdown, the voltage that each diode is shared are about
100V, busbar voltage only 700V are shared to Zener diode, and unnecessary voltage will be undertaken by resistance (R1, R2).When voltage after
When of continuing rising high, resistance (R1, R2) is burnt because of excessively stream.When voltage continue raise when, Zener diode by avalanche breakdown, by voltage stabilizing two
The 100V voltages that pole pipe is shared will be shared by other diodes, so as to cause the continuous avalanche breakdown of other diodes.Due to two
After pole pipe avalanche breakdown, the electric current that moment produces is very big, causes optocoupler to burst and high-voltage signal is delivered to current-variable controller, will
Controller punch through damage, meanwhile, high-voltage signal can also be delivered to the 24V power ends of system, damage power supply.It is i.e. of the prior art
Optocoupler occurs the phenomenon of isolation failure, and the high-pressure energy that can not be effectively prevented current transformer is delivered to low-voltage electrical part.
The content of the invention
It is an object of the invention to provide a kind of over-pressure safety device of wind power unit converter so as to effectively can prevent from becoming
The low-voltage electrical partial destruction that stream device high-pressure energy is transmitted to low-pressure side and causes.
Further object is that a kind of wind power unit converter containing above-mentioned over-pressure safety device is provided, can
The safety of current transformer is effectively ensured.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of over-pressure safety device of wind power unit converter, it is single including the overvoltage detection for being connected with current transformer bus
Unit, also including power supply signal generating unit and failure delivery unit；The power supply signal generating unit includes insulating power supply U16, for becoming
Stream device power-supply system 24V power supplys carry out isolation change and for overvoltage detector unit and failure delivery unit power supply is provided;It is described
Failure delivery unit includes the relay K4, the mos that the mos pipes Q7 being connected with the failure output terminal of over-pressed detector unit is driven
The relay K4 that pipe Q7 drives is connected for the controller with current transformer.
Further, the power supply signal generating unit also including commutation diode D55, magnetic bead L6, filter capacitor C54, C53,
TVS pipe D56, fuse F5, filter inductance L5 and varistor RV2, wherein：The commutation diode D55, fuse F5 and filter
Ripple inductance L5 is sequentially connected in series the 24V positive sources in current transformer power-supply system between insulating power supply U16 electrode input ends, described
Magnetic bead L6 is connected to earth point between insulating power supply U16 negative inputs, the filter capacitor C54, C53, TVS pipe D56, pressure
Quick resistance RV2 is connected in parallel between the both positive and negative polarity input of insulating power supply U16, and the filter inductance L5, fuse F5 are connected to pressure
Between quick resistance RV2 and TVS pipe D56；Also include being connected in parallel on COMMON ends and the 12V positive source outfans of insulating power supply U16
Between electric capacity C49, C50, C51, C52, insulating power supply U16 COMMON ends ground connection.
Further, the isolation voltage of the insulating power supply U16 is more than 1000V.
Further, the over-pressed detector unit includes the resistance R59, voltage stabilizing two that the positive bus-bar with current transformer is sequentially connected in series
Pole pipe D58, D59, D60, D61, D62, D63, D64, fuse F6, resistance R60, optocoupler U17；Also include TVS pipe D65 and filtering
Electric capacity C56, TVS pipe D65 one end are connected between fuse F6 and resistance R60, and other end ground connection, filter capacitor C56 are connected in parallel on
The input of optocoupler U17, and filter capacitor C56 one end ground connection, the failure output terminal of optocoupler U17 are connected with switching diode D66,
It is connected with described failure delivery unit again, optocoupler U17 is connected with insulating power supply U16；Also include with the negative busbar of current transformer according to
The resistance R62 of secondary series connection, Zener diode D69, D70, D71, D72, D73, D74, D75, fuse F7, resistance R63, optocoupler
U18, also including TVS pipe D67 and filter capacitor C57, TVS pipe D67 one end is connected between fuse F7 and resistance R63, another
End ground connection；Filter capacitor C57 is connected in parallel on the input of optocoupler U18, and filter capacitor C57 one end ground connection, and the failure of optocoupler U18 is defeated
Go out end and be connected with switching diode D68, then be connected with described failure delivery unit, optocoupler U18 is connected with insulating power supply U16.
Further, the failure delivery unit also includes resistance R58, audion Q8, resistance R56, resistance R55, wherein：
Resistance R58 one end is connected with the failure output terminal of over-pressed detector unit, and the base stage of other end connecting triode Q8, in audion Q8
Base stage and emitter stage between be also parallel with electric capacity C55 and resistance R61;The colelctor electrode of audion Q8 successively with resistance R56, resistance
The source electrode of R55 and mos pipe Q7 is connected, and the source electrode of mos pipe Q7 is also connected with power supply signal generating unit；The grid and resistance of mos pipe Q7
The intermediate connection connection of R56, resistance R55；4 feet of the drain electrode connection relay K4 of mos pipe Q7, the 1 foot connection of relay K4 become
The 24V positive terminals of stream device power-supply system, 2 feet of relay K4 are failure output terminal, are connected for the controller with current transformer；After
2 feet of electrical equipment K4 are also associated with 5 feet of Zener diode D54, Zener diode D54 and relay K4 and are connected to audion Q8's
Emitter stage, grounded emitter.
Further, the audion Q8 models 9014.
A kind of wind power unit converter, including above-mentioned over-pressure safety device, the overvoltage detection of the over-pressure safety device
Unit is connected with the bus of current transformer.
Compared with prior art, the invention has the advantages that：
In the present invention, power supply signal generating unit is designed using insulating power supply, be effectively prevent current transformer and over-voltage fault is being occurred
When low-pressure side is transmitted to by power pack；The over-voltage fault that over-pressed detector unit is detected by failure delivery unit is managed by mos
The relay of driving by over-pressed signal transmission to current transformer controller, by using Magnetic isolation technology, i.e., by relay
Control coil produces magnetic field suction switch and carries out signal transduction, effectively prevent current transformer high-pressure energy and is transmitted to low-pressure side,
The safety of low-pressure side electric part is ensured.
Below by drawings and Examples, technical scheme is described in further detail.
Description of the drawings
Fig. 1 is a kind of over-pressure safety device circuit diagram of wind power unit converter of the prior art；
Fig. 2 is the power supply signal generating unit circuit diagram in the Wind turbines over-pressure safety device of the present invention；
Fig. 3 is the over-pressed detection cell circuit figure in the Wind turbines over-pressure safety device of the present invention；
Fig. 4 is the failure delivery unit circuit diagram in the Wind turbines over-pressure safety device of the present invention.
Specific embodiment
The preferred embodiments of the present invention are illustrated below in conjunction with accompanying drawing, it will be appreciated that preferred reality described herein
Apply example and be merely to illustrate and explain the present invention, be not intended to limit the present invention.
Current transformer is the energy conversion of wind-driven generator and electrical network, and during current transformer normal work, busbar voltage is higher than
1000V, so busbar voltage monitoring device（That is over-pressure safety device）High voltage isolation techniques must be adopted.
The invention provides a kind of over-pressure safety device of wind power unit converter, including power supply signal generating unit, overvoltage inspection
Unit, failure delivery unit is surveyed, power supply signal generating unit is designed using insulating power supply, prevent current transformer from leading to when there is over-voltage fault
Cross power pack and be transmitted to low-pressure side, for by the 24V power supplys of current transformer power-supply system carry out isolation change and be overvoltage detection
Unit and failure delivery unit provide power supply；Over-pressed detector unit is similar with original design, i.e., using series voltage stabilizing diode and light
Over-voltage fault is given failure delivery unit by coupling；The over-voltage fault that over-pressed detector unit is detected is passed through by failure delivery unit
Over-pressed signal transmission to the controller of current transformer, is realized the high_voltage isolation of over-voltage fault signal by the driving relay of mos pipes.
Wherein, power supply signal generating unit is as shown in Fig. 2 including insulating power supply U16, commutation diode D55, magnetic bead L6, filtering
Electric capacity C54, C53, TVS pipe D56, fuse F5, filter inductance L5 and varistor RV2, wherein：Commutation diode D55, fusing
Device F5 and filter inductance L5 are sequentially connected in series the 24V positive sources in current transformer power-supply system to insulating power supply U16 electrode input ends
Between, magnetic bead L6 is connected to earth point between insulating power supply U16 negative inputs, filter capacitor C54, C53, TVS pipe D56,
Varistor RV2 is connected in parallel between the both positive and negative polarity input of insulating power supply U16, and filter inductance L5, fuse F5 are connected to pressure-sensitive
Between resistance RV2 and TVS pipe D56；Also include being connected in parallel on the COMMON ends of insulating power supply U16 and 12V positive sources outfan it
Between electric capacity C49, C50, C51 and C52, insulating power supply U16 COMMON ends ground connection.
The 24V power supplys of current transformer power-supply system provide insulating power supply U16, wherein rectification two by commutation diode D55
The main effect of pole pipe D55 is Anti-misplug and isolate, and filter capacitor C53, C54 are power filter effect, and TVS pipe D56 prevents 24V
The surge voltage that power supply occurs, varistor RV2 plays a part of system second class protection, by insulating power supply U16 generation systems
The 12V power supplys of demand, insulating power supply U16 must be more than the insulating power supply module of 1000V using isolation voltage, herein power circuit
For the Power Management Design core of over-pressure safety device, it is by the 24V power supplys of current transformer power-supply system after insulating power supply U16 isolation
Over-pressure safety device+12V voltages are supplied to, for using inside over-pressure safety device.
In the present embodiment, commutation diode D55 adopts 1N4007；TVS pipe D56 adopts SMBJ30CA/30V；Fuse F5
Using SMD1812P075TF/33；Filter inductance L5 is 330uH；Varistor RV2 adopts 390KD14.
Over-pressed detector unit as shown in figure 3, be sequentially connected in series including the positive bus-bar with current transformer resistance R59, two pole of voltage stabilizing
Pipe D58, D59, D60, D61, D62, D63, D64, fuse F6, resistance R60, optocoupler U17；Also include TVS pipe D65 and filtered electrical
Hold C56, TVS pipe D65 one end is connected between fuse F6 and resistance R60, other end ground connection, filter capacitor C56 are connected in parallel on light
The input of coupling U17, and filter capacitor C56 one end ground connection, the failure output terminal of optocoupler U17 are connected with switching diode D66, then
It is connected with failure delivery unit, optocoupler U17 is connected with insulating power supply U16；Also include that the negative busbar with current transformer is sequentially connected in series
Resistance R62, Zener diode D69, D70, D71, D72, D73, D74, D75, fuse F7, resistance R63, optocoupler U18, also include
TVS pipe D67 and filter capacitor C57, TVS pipe D67 one end are connected between fuse F7 and resistance R63, other end ground connection；Filtering
Electric capacity C57 is connected in parallel on the input of optocoupler U18, and filter capacitor C57 one end ground connection, and the failure output terminal of optocoupler U18 is connected with
Switching diode D68, then be connected with failure delivery unit, optocoupler U18 is connected with insulating power supply U16.
Over-pressed detector unit is connected to the positive bus-bar of current transformer by 11 pins of binding post P5, and 7 feet of P5 are connected to
Current transformer ground wire, 3 feet of P5 are connected to current transformer negative busbar, will the positive and negative busbar of current transformer be connected to over-pressure safety device.
Cleaning Principle is to drive optocoupler U17, U18 to realize over-pressed signal generation, wherein resistance by the direction conducting of Zener diode
R59, R62 primarily serve the effect of current limliting, and TVS pipe D65, D67 mainly prevents optocoupler from being disturbed by surge, plays the work of protection
With, when the conducting electric current of this over-pressed measure loop fusing value specified more than fuse F6, F7, fuse F6, F7 are fused rapidly,
Prevent optocoupler U17, U18 from puncturing.
In the present embodiment, resistance R59, R62 adopt 3K, Zener diode D58-D64 and D69-75 to adopt ZPY100；Fusing
Device F6, F7 adopt SMD1812P150TF/24；Resistance R60, R63 adopt 1.5K, optocoupler U17, U18 to adopt TLP521；TVS pipe
D65, D67 adopt 5.0SMDJ22CA；Switching diode D66, D68 adopt 1N4148.
Failure delivery unit as shown in figure 4, including mos pipe Q7, relay K4, resistance R58, audion Q8, resistance R56,
Resistance R55, wherein：Resistance R58 one end is connected with the failure output terminal of over-pressed detector unit, the base of other end connecting triode Q8
Pole, is also parallel with electric capacity C55 and resistance R61 between the base stage of audion Q8 and emitter stage;The colelctor electrode of audion Q8 is successively
It is connected with the source electrode of resistance R56, resistance R55 and mos pipe Q7, the source electrode of mos pipe Q7 is also connected with power supply signal generating unit；Mos is managed
The grid of Q7 is connected with the intermediate connection of resistance R56, resistance R55；4 feet of the drain electrode connection relay K4 of mos pipe Q7, relay
1 foot of K4 connects the 24V positive terminals of current transformer power-supply system, and 2 feet of relay K4 are failure output terminal, for current transformer
Controller connects；2 feet of relay K4 are also associated with 5 feet of Zener diode D54, Zener diode D54 and relay K4 and connect
It is connected to the emitter stage of audion Q8, grounded emitter.
The over-pressed signal given by over-pressed detector unit（ERROR_OUTPUT signals in Fig. 3）Drive audion Q8
Afterwards, audion Q8 conductings drive mos pipe Q7, mos pipes Q7 to drive relay K4, the ERROR signals of relay K4 are sent to and " is become
The controller of stream device ", completes the transmission of fault-signal.In the present embodiment, audion Q8 models 9014, mos pipes Q7 are adopted
IRF5305, because 9014 driving force it is limited, so this design in using mos pipes Q7 drive relay K4, it is ensured that system sets
The reliability of meter, while by the buffer action of relay K4, completes isolating for high-pressure side and low-pressure side, it is ensured that system
Safety, solves the problems, such as that original system high-low pressure is isolated.
Current transformer bus of the over-pressed detector unit of above-mentioned over-pressure safety device with Wind turbines is attached, can be formed
Current transformer with effective over-voltage protecting function, after current transformer is higher than certain threshold values in busbar voltage, over-pressure safety device report
It has the high failure of busbar voltage, current transformer makes corresponding protection act after obtaining this signal, can effectively ensure that the safety of current transformer.
Finally it should be noted that：The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to,
Although being described in detail to the present invention with reference to the foregoing embodiments, for a person skilled in the art, which still may be used
To modify to the technical scheme described in previous embodiment, or equivalent is carried out to which part technical characteristic.It is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements made etc., should be included in the guarantor of the present invention
Within the scope of shield.
Claims (4)
1. a kind of over-pressure safety device of wind power unit converter, single including the overvoltage detection for being connected with current transformer bus
Unit, it is characterised in that also including power supply signal generating unit and failure delivery unit；
The power supply signal generating unit includes insulating power supply U16, for the 24V power supplys of current transformer power-supply system are carried out isolation conversion
And be that over-pressed detector unit and failure delivery unit provide power supply；
The failure delivery unit includes the relay that the mos pipes Q7 being connected with the failure output terminal of over-pressed detector unit is driven
K4, the relay K4 that the mos pipes Q7 drives are connected for the controller with current transformer；
The power supply signal generating unit also includes commutation diode D55, magnetic bead L6, filter capacitor C54, C53, TVS pipe D56, fusing
Device F5, filter inductance L5 and varistor RV2, wherein：The commutation diode D55, fuse F5 and filter inductance L5 are successively
The 24V positive sources of current transformer power-supply system are connected on between insulating power supply U16 electrode input ends, the magnetic bead L6 is connected to
, between insulating power supply U16 negative inputs, the filter capacitor C54, C53, TVS pipe D56, varistor RV2 are simultaneously for earth point
Be associated between the both positive and negative polarity input of insulating power supply U16, the filter inductance L5, fuse F5 be connected to varistor RV2 and
Between TVS pipe D56；
Also include being connected in parallel on electric capacity C49 between the COMMON ends of insulating power supply U16 and 12V positive source outfans, C50,
C51, C52, the COMMON ends ground connection of insulating power supply U16.
2. over-pressure safety device according to claim 1, it is characterised in that the isolation voltage of the insulating power supply U16 is big
In 1000V.
3. over-pressure safety device according to claim 1, it is characterised in that the over-pressed detector unit includes and current transformer
Positive bus-bar be sequentially connected in series resistance R59, Zener diode D58, D59, D60, D61, D62, D63, D64, fuse F6, resistance
R60, optocoupler U17；Also include TVS pipe D65 and filter capacitor C56, TVS pipe D65 one end be connected to fuse F6 and resistance R60 it
Between, other end ground connection, filter capacitor C56 positive and negative electrodes are connected with the input positive and negative electrode of optocoupler U17 respectively, and filter capacitor
C56 negative poles are also grounded, and the failure output terminal of optocoupler U17 is connected with switching diode D66, then connects with described failure delivery unit
Connect, optocoupler U17 is connected with insulating power supply U16；
Also include resistance R62, Zener diode D69, D70, D71, D72, D73 that the negative busbar with current transformer is sequentially connected in series,
D74, D75, fuse F7, resistance R63, optocoupler U18, also including TVS pipe D67 and filter capacitor C57, the connection of TVS pipe D67 one end
Between fuse F7 and resistance R63, other end ground connection；Filter capacitor C57 positive and negative electrodes are rectified with the input of optocoupler U18 respectively,
Negative pole connects, and filter capacitor C57 positive poles are also grounded, and the failure output terminal of optocoupler U18 is connected with switching diode D68, then with
Described failure delivery unit connection, optocoupler U18 are connected with insulating power supply U16.
4. a kind of wind power unit converter, it is characterised in that including the over-pressure safety device described in any one of claim 1-3,
The over-pressed detector unit of the over-pressure safety device is connected with the bus of current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310646091.1A CN103606898B (en) | 2013-12-04 | 2013-12-04 | Overvoltage protection device of converter of wind turbine generator set and converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310646091.1A CN103606898B (en) | 2013-12-04 | 2013-12-04 | Overvoltage protection device of converter of wind turbine generator set and converter |
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| CN103606898B true CN103606898B (en) | 2017-03-22 |
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| CN201310646091.1A Active CN103606898B (en) | 2013-12-04 | 2013-12-04 | Overvoltage protection device of converter of wind turbine generator set and converter |
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| CN109560537A (en) * | 2017-09-27 | 2019-04-02 | 深圳光峰科技股份有限公司 | A kind of optocoupler overvoltage crowbar and associated appliance |
| CN110752585A (en) * | 2019-10-17 | 2020-02-04 | 珠海格力电器股份有限公司 | Brushless direct current motor voltage protection device and brushless direct current motor |
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| CN101345507A (en) * | 2008-08-16 | 2009-01-14 | 山西合创电力科技有限公司 | Energy-saving control device of megawatt level multifunctional aerogenerator |
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| CN103606898A (en) | 2014-02-26 |
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