CN102457048A - Overvoltage protection device of wind driven generator set converter - Google Patents
Overvoltage protection device of wind driven generator set converter Download PDFInfo
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- CN102457048A CN102457048A CN201010530176XA CN201010530176A CN102457048A CN 102457048 A CN102457048 A CN 102457048A CN 201010530176X A CN201010530176X A CN 201010530176XA CN 201010530176 A CN201010530176 A CN 201010530176A CN 102457048 A CN102457048 A CN 102457048A
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Abstract
The invention discloses an overvoltage protection device of a wind driven generator set converter, wherein the overvoltage protection device consists of a precision resistor voltage division circuit, an independent reference source circuit, a voltage hysteresis comparison circuit, a high-low voltage isolating circuit, a failure warning circuit, a DC/DC (direct current/direct current) power supply and an LDO (low dropout regulator) module circuit. Through the precision resistor voltage division circuit, after a high voltage is changed into a low voltage through voltage division, the low voltage and the reference source circuit are compared, if the low voltage is higher than the reference source voltage, a low level is output through the voltage hysteresis comparison circuit, and if the low voltage is lower than the reference source voltage, a high level is output through the voltage hysteresis comparison circuit; and a failure signal is transferred to a main control system of a wind driven generator set through the high-low voltage isolating circuit and the failure warning circuit, and the main control system determines whether a converter bus voltage is overhigh through reading the failure signal.
Description
Technical field:
The present invention relates to a kind of current transformer over-pressure safety device, relate in particular to the above wind turbine generator current transformer of a kind of MW class over-pressure safety device.
Background technology:
Wind turbine generator probably can be divided into following several kinds at present: directly drive frequency conversion unit and double-fed unit.5 tame wind-driven generator group manufacturers of domestic maximum wherein have 3 families to produce and directly drive the frequency conversion wind power generation unit.Regardless of being the double-fed unit or directly driving the frequency conversion unit that current transformer all is an important components.
The major function of current transformer is that the electric energy that wind turbine generator produces is carried out: the conversion of interchange-AC/DC makes the frequency of the electric energy of final access national grid satisfy the requirement of national grid.The cost of current transformer in the separate unit unit probably can account for 30%--40% at present.So how to guarantee current transformer safety, stable operation, be an important problem of wind power generation industry.
Current transformer changes direct current into through the alternating current that generator is sent in running, and then inversion is that alternating current is realized being incorporated into the power networks.With the unit of former 750KW comparatively speaking, many direct current components.So how the protection to direct voltage is the emphasis that guarantees the current transformer safety and stability.If it is low that the protection of direct voltage point is provided with, the blower fan start and stop that can not stop so.If the protection of direct voltage point is provided with height.Burn current transformer so easily.In the case of early stage contact, the straight wind dispelling machine manufacturer of domestic maximum once occurred at the scene tens of since the protection value be provided with too high, the case that causes current transformer to burn.
The precision of existing current transformer over-pressure safety device detection DC bus-bar voltage is not high enough; The subsequent process circuit response speed is fast inadequately; Cause converter module to burn easily; So when current transformer is protected, consider: the protection magnitude of voltage of current transformer is wanted accurately, protected mode is wanted science, response speed is wanted soon, circuit has forceful electric power isolation features etc.
Summary of the invention:
In order to address the above problem, guarantee the current transformer steady operation, the present invention provides the over-voltage protection method that a kind of precision is high, isolation Level is high, response speed is fast.
Apparatus of the present invention comprise the precision resistance bleeder circuit; Independently reference source circuit, voltage hysteresis comparison circuit, high/low-voltage isolation circuit, failure alarm circuit and DC/DC direct current become direct current and LDO modular circuit composition; Through said precision resistance bleeder circuit, with becoming low-voltage after the high voltage dividing potential drop, this voltage and said reference source circuit are relatively; If be higher than a reference source voltage then through said voltage hysteresis comparison circuit output low level; If be lower than a reference source voltage, said hysteresis comparison circuit output high level sends fault-signal to master control system through said high/low-voltage isolation circuit and failure alarm circuit.Master control system can be judged whether the current transformer busbar voltage is too high, thereby take appropriate measures through reading said fault-signal, guarantees the normal operation of wind turbine generator.
Above-mentioned precision resistance bleeder circuit is by 3 resistances that 200K ohm, precision are 0.1%, power is 0.5W and 2 resistances are that 20K ohm, precision are 0.1%, power is 0.5W and 1 resistance is that the resistance that 10K ohm, precision are 0.1%, power is 0.5W is composed in series.Like this high tension voltage will be in the above said 10K ohms be reduced to originally 1/65, aforementioned resistance is 0.1% high-precision resistance, the magnitude of voltage error is 0.1% after institute's dividing potential drop.
The said reference source circuit is 10V, and the input voltage of this chip is 15V in the present invention, and output voltage is 10V.This 10V does voltage ratio benchmark threshold value, makes comparisons with above-mentioned precision resistance voltage after partial.This reference source circuit is characterised in that the wide input voltage range of chip, is 11.4V-36V, and the output voltage precision of chip is high, is 10V ± 0.0025V, and the temperature of chip is floated low, is ± 5PPM/ ℃.
Above-mentioned voltage hysteresis comparison circuit is made up of operational amplifier and resistance capacitance, and this circuit has typical hysteresis loop comparator function., antijamming capability is strong, can prevent output jitter.
Above-mentioned high/low-voltage isolation circuit is made up of photoelectrical coupler and resistance capacitance, can bus high-voltage signal part effectively be isolated with low voltage control system, and isolation voltage is less than or equal to 8000V/us, and traffic rate is fast, and the response time can reach 150ns.
Failure alarm circuit by or the door constitute; Because the current transformer busbar voltage is made up of positive and negative two-way voltage; Apparatus of the present invention are handled said positive and negative two-way voltage respectively; Work when undesired as any one the road, or a door output high level signal gives master control system, the two-way alarm signal form and be " or " logical relation.
Above-mentioned DC/DC circuit and LDO are made up of power module and chip; It can with after the DC power supply input through isolating; Output corresponding circuits required voltage value through selecting power module and chip, can realize that different users is to the circuit isolation Level; The power supply input, the isoparametric requirement of power.This protective device compared with prior art has voltage isolation grade high (reaching as high as 6), precision is high, response speed is fast, circuit power consumption is little.
Description of drawings
Fig. 1 is the block diagram that structure of the present invention is formed;
Fig. 2 is the block diagram of precision resistance bleeder circuit of the present invention;
Fig. 3 is the block diagram of hysteresis comparison circuit of the present invention;
Fig. 4 is the block diagram of high/low-voltage isolation circuit of the present invention;
Fig. 5 is the block diagram of failure alarm circuit of the present invention.
Embodiment
With reference to accompanying drawing, will be described in detail embodiment of the present invention.
With reference to Fig. 1, this device can be divided into 10 parts, the current transformer bus under normal circumstances exports+450V about with-450V left and right sides voltage signal, when any end output of generating positive and negative voltage surpasses 650V, should be fault.Visible the present invention is a two paths of signals in Fig. 1; Wherein precision resistance bleeder circuit 1 is identical with precision resistance bleeder circuit 2; Hysteresis comparison circuit 1 is identical with hysteresis comparison circuit 2; High/low-voltage isolation circuit 1 is identical with high/low-voltage isolation circuit 2, and promptly the positive voltage branch road is identical with the principle of negative voltage branch road among Fig. 1.The positive voltage branch road is explained overall operation principle of the present invention and process at present.High-voltage signal is reduced to low-voltage signal through precision resistance bleeder circuit 1 with high-voltage signal---comparative voltage 1; Normal operating conditions bus+450V voltage is 6.92V voltage through the comparative voltage 1 that precision resistance bleeder circuit 1 obtains; Comparative voltage 1 is with bus positive voltage linear change; When busbar voltage reach+during 656.24V, comparative voltage 1 will be 10.096V.Comparative voltage 1 compares through the hysteresis comparison circuit with 10V a reference source; When comparative voltage 1 is lower than 10V; The output signal of hysteresis comparison circuit---comparison output signal 1 is the 15V high level signal, and when comparative voltage 1 was higher than 10V, comparison output signal 1 was-the 15V low level signal.High/low-voltage isolation circuit can be kept apart bus high tension voltage system and 24V controller system fully among Fig. 1, when comparison output signal 1 be+during 15V, fault-signal 1 is 0V, comparison output signal 1 is-during 15V, fault-signal 1 is+15V.
Fault-signal 1 is exported fault-signal with fault-signal 2 through failure alarm circuit, and the final fault signal send master control system.Like this, the present invention will have following four kinds of operating states in the course of the work
1. bus positive voltage and bus negative voltage are all normal, and fault-signal is the 0V low level;
2. bus positive voltage fault, the bus negative voltage is normal, and fault-signal is the 15V high level;
3. the bus positive voltage is normal, bus negative voltage fault, and fault-signal is the 15V high level;
4. bus positive voltage and the equal fault of bus negative voltage, fault-signal is the 15V high level.
With reference to Fig. 2, be the schematic diagram of precision resistance bleeder circuit 1, resistance R 1, R2, R3 resistance are 200K ohm in this circuit, and resistance R 4, R5 resistance are 20K ohm, and resistance R 6 resistances are 10K ohm.C1, C2 are filter capacitor, and D1 position 12V voltage stabilizing didoe, D2 are the 13.6V Transient Suppression Diode, and D1, D2 are used for protection and tell hysteresis comparison circuit 1.Like this, according to the series resistance principle, comparative voltage 1 with the positive relation of busbar voltage does
Comparative voltage 1=busbar voltage just * 1/65.To become low-voltage signal to high-voltage signal like this.
With reference to Fig. 3, be hysteresis comparison circuit 1, according to hysteresis comparison circuit principle, draw following two formulas.
Uth1＝(10V*510K+15V*10K)/(510K+10K)＝10.096V；
Uth2＝(10V*510K-15*10K)/(510K+10K)＝9.519V；
Here 10V provides for the 10V reference source circuit, and 510K is R8, and 10K is R7, and 15V is that DC/DC provides.Uth1 is the upper limit threshold values of hysteresis comparison circuit, and when comparative voltage 1 has 0V to increase to Uth1, comparison output signal 1 will become low level-15V by high level+15V.Uth2 is a hysteresis comparison circuit lower limit threshold values, when comparison output signal 1 when being reduced to Uth2 greater than Uth1, exporting signal 1 will become high level+15V by low level-15V.
Learn that through above-mentioned precision resistance bleeder circuit 1 analysis Uth1 corresponding bus lines voltage is Uth1 * 65=656.24V, Uth2 corresponding bus lines voltage is Uth2 * 65=618.73V.Like this through said hysteresis comparison circuit, with effectively taking precautions against the interference that voltage dithering brings.
With reference to Fig. 4 is high/low-voltage isolation circuit 1, and when comparison output signal 1 was high level, light lotus root HCPL2232 input ended, and its output signal-fault-signal 1 will be low level signal; When comparison output signal 1 is low level, the conducting of light lotus root HCPL2232 input, its output signal-fault-signal 1 will be high level signal.
With reference to Fig. 5 is failure alarm circuit, and chip is CD4071B, and this chip is or gate logic, will die signal 1 and fault-signal 2 are carried out " or " logical process, export fault-signal at last.So final positive and negative busbar voltage any one brings out existing this device of fault will send alarm signal to master control system.
In sum, the present invention can judge accurately whether busbar voltage is in normal operating conditions, and can prevent effectively that the erroneous judgement that causes because of voltage dithering that current transformer busbar voltage and external interference signal bring is disconnected.
Claims (7)
1. wind turbine generator current transformer over-pressure safety device; Comprise the precision resistance bleeder circuit, independently reference source circuit, voltage hysteresis comparison circuit, high/low-voltage isolation circuit, failure alarm circuit and DC-DC power supply are that DC/DC and low pressure difference linear voltage regulator are that the LDO modular circuit is formed, its characteristic with; Through said precision resistance bleeder circuit; With becoming low-voltage after the high voltage dividing potential drop, said low-voltage and said reference source circuit compare, if be higher than a reference source voltage; Then through said voltage hysteresis comparison circuit output low level; If be lower than a reference source voltage, said hysteresis comparison circuit output high level is sent to the wind turbine generator master control system through said high/low-voltage isolation circuit and said failure alarm circuit with fault-signal; Master control system judges through reading said fault-signal whether the current transformer busbar voltage is too high.
2. according to the said current transformer over-pressure safety device of claim 1; It is characterized in that; Said precision resistance bleeder circuit is by 3 resistances that 200K ohm, precision are 0.1%, power is 0.5W and 2 resistances are that 20K ohm, precision are 0.1%, power is 0.5W and 1 resistance is that the resistance that 10K ohm, precision are 0.1%, power is 0.5W is composed in series; High tension voltage is reduced to 1/65 of said high tension voltage value in said 10K ohms; Said resistance is 0.1% high-precision resistance, and the magnitude of voltage error is 0.1% after the dividing potential drop.
3. according to the said current transformer over-pressure safety device of claim 1; It is characterized in that; The voltage benchmark threshold value of said reference source circuit is 10V, makes comparisons with said precision resistance voltage after partial, and the input voltage of said reference source circuit chip is 11.4V-36V; The output voltage of said chip is 10V ± 0.0025V, and the temperature of said chip is floated and is ± 5PPM/ ℃.
4. according to the said current transformer over-pressure safety device of claim 1, it is characterized in that said antijamming capability voltage hysteresis comparison circuit strong and anti-output jitter is made up of operational amplifier and resistance capacitance.
5. according to the said current transformer over-pressure safety device of claim 1; It is characterized in that; Said high/low-voltage isolation circuit is made up of photoelectrical coupler and resistance capacitance; Said buffer circuit is effectively isolated bus high-voltage signal part with low voltage control system, and said isolation voltage is less than or equal to 8000V/us, and the communication response time can reach 150ns.
6. according to the said current transformer over-pressure safety device of claim 1; It is characterized in that; Said failure alarm circuit by or door constitute, the positive and negative two-way voltage of said current transformer busbar voltage is handled respectively, if when having any one road voltage undesired; A said or door output high level signal is given master control system, the alarm signal of said positive and negative two-way voltage form and be " or " logical relation.
7. according to the said current transformer over-pressure safety device of claim 1, it is characterized in that said DC/DC circuit and LDO are made up of power module and chip; Said can with after the DC power supply input through isolating; Output corresponding circuits required voltage value through selecting power module and chip, can realize that different users is to the circuit isolation Level; The power supply input, the isoparametric requirement of power.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010530176.XA CN102457048B (en) | 2010-10-29 | 2010-10-29 | Overvoltage protection device of wind driven generator set converter |
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| CN201010530176.XA CN102457048B (en) | 2010-10-29 | 2010-10-29 | Overvoltage protection device of wind driven generator set converter |
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| CN102457048A true CN102457048A (en) | 2012-05-16 |
| CN102457048B CN102457048B (en) | 2017-02-01 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606898A (en) * | 2013-12-04 | 2014-02-26 | 北京天源科创风电技术有限责任公司 | Overvoltage protection device of converter of wind turbine generator set and converter |
| CN108459248A (en) * | 2018-04-02 | 2018-08-28 | 广东电网有限责任公司 | Transmission line corona discharge detection device |
| CN109066642A (en) * | 2018-09-20 | 2018-12-21 | 江苏为恒智能科技有限公司 | A kind of two-way over-voltage hysteresis protection circuit of high-precision |
| CN109217929A (en) * | 2018-10-29 | 2019-01-15 | 黄河科技学院 | A kind of super high speed all-optical communication system |
| 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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| JPH05133986A (en) * | 1991-11-11 | 1993-05-28 | Fuji Electric Co Ltd | Power supply voltage monitoring circuit |
| CN2783334Y (en) * | 2005-02-23 | 2006-05-24 | 华为技术有限公司 | Over current detector |
| CN201490701U (en) * | 2009-08-31 | 2010-05-26 | 上海睿英电气有限公司 | Voltage protection circuit of frequency converter |
| CN101752840A (en) * | 2008-12-19 | 2010-06-23 | 艾默生网络能源系统北美公司 | Numerical control power supply overvoltage protection circuit |
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2010
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH05133986A (en) * | 1991-11-11 | 1993-05-28 | Fuji Electric Co Ltd | Power supply voltage monitoring circuit |
| CN2783334Y (en) * | 2005-02-23 | 2006-05-24 | 华为技术有限公司 | Over current detector |
| CN101752840A (en) * | 2008-12-19 | 2010-06-23 | 艾默生网络能源系统北美公司 | Numerical control power supply overvoltage protection circuit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606898A (en) * | 2013-12-04 | 2014-02-26 | 北京天源科创风电技术有限责任公司 | Overvoltage protection device of converter of wind turbine generator set and converter |
| CN103606898B (en) * | 2013-12-04 | 2017-03-22 | 北京天源科创风电技术有限责任公司 | Overvoltage protection device of converter of wind turbine generator set and converter |
| CN108459248A (en) * | 2018-04-02 | 2018-08-28 | 广东电网有限责任公司 | Transmission line corona discharge detection device |
| CN109066642A (en) * | 2018-09-20 | 2018-12-21 | 江苏为恒智能科技有限公司 | A kind of two-way over-voltage hysteresis protection circuit of high-precision |
| CN109066642B (en) * | 2018-09-20 | 2024-04-05 | 江苏为恒智能科技有限公司 | High-precision bidirectional overvoltage hysteresis protection circuit |
| CN109217929A (en) * | 2018-10-29 | 2019-01-15 | 黄河科技学院 | A kind of super high speed all-optical communication system |
| CN109217929B (en) * | 2018-10-29 | 2020-06-05 | 中原工学院 | Superspeed all-optical communication system |
| 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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| CN102457048B (en) | 2017-02-01 |
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