CN201682292U - Chopping device based on low-voltage ride-through - Google Patents
Chopping device based on low-voltage ride-through Download PDFInfo
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- CN201682292U CN201682292U CN2010201341956U CN201020134195U CN201682292U CN 201682292 U CN201682292 U CN 201682292U CN 2010201341956 U CN2010201341956 U CN 2010201341956U CN 201020134195 U CN201020134195 U CN 201020134195U CN 201682292 U CN201682292 U CN 201682292U
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Abstract
The utility model provides a chopping device based on low-voltage ride-through; the chopping device is arranged in a current transformer, and comprises a chopping electric resistance device and a power switch device which are connected in series, and a direct current interlinking device which are connected with the chopping electric resistance device and the power switch device in parallel. The chopping device is provided with the chopping electric resistance device, can guarantee the stable running of a power system when a generator set rides through in a low voltage way, improves the stability of the voltage of a power grid, absorbs the electric current in a circuit, consumes the charging power of a direct current capacitor, limits a DC side voltage and protects the direct current interlinking device; the side circuit of a rotor of the current transform is internally connected with a plurality of diodes, which can reduce the transient state impact damage of the higher currents of the side currents of the rotor on the generator and the current transformer and improves the stability of voltage of a power grid; a component of a direct current side over-voltage protector is connected with the current transformer and combined into the low-voltage ride-through chopping device with the current transformer, thus reducing the cost of the system and increasing the rapidity and stability of the control.
Description
Technical field
The utility model relates to a kind of copped wave device that is used for technical field of electricity, is specifically related to a kind of copped wave device that passes through based on low-voltage.
Background technology
At present, the wind power generation that is incorporated into the power networks is a renewable energy technologies with the fastest developing speed in the world over past ten years.The difference of wind power generator incorporated in power network and the traditional equipment that generates electricity by way of merging two or more grid systems maximum is that it can not keep the voltage and the frequency of electrical network during electric network fault, and this stability to electric power system is very unfavorable.Electric network fault is a kind of abnormal running form of electrical network, mainly contains the transmission line short circuit or opens circuit these two kinds of forms of expression.As three relatively, over the ground single-phase and short-circuit between conductors or open circuit etc., they can cause the acute variation of line voltage amplitude.
Double-fed type speed changing and constant frequency wind-powered electricity generation unit is the mainstream model of at present domestic and international wind-powered electricity generation unit; its generating equipment is a double fed induction generators; when electric network fault occurring, existing protection philosophy be with double fed induction generators immediately from electrical network off-grid to guarantee the safety of unit.Along with the continuous increase of wind-powered electricity generation unit single-machine capacity and the continuous expansion of wind energy turbine set scale, influencing each other between wind-powered electricity generation unit and electrical network is on the rise.Force large tracts of land wind-powered electricity generation unit because of the autoprotection off-grid in case electrical network breaks down, will have a strong impact on the operation stability of electric power system.Therefore, continuous increase along with the double fed induction generators capacity that inserts electrical network, electrical network is more and more higher to its requirement, generally require generating set not off-grid operation (fault ride-through) under the situation of electric voltage dropping to occur at electric network fault, and behind failure removal, can help power system recovery stable operation as early as possible, that is to say, require the wind-powered electricity generation unit to have certain low-voltage and pass through (lowvoltage ride-through) ability.Under the electric network electric voltage drop situation, double fed induction generators in the wind-powered electricity generation unit can cause the rotor-side overcurrent, simultaneously increasing sharply of rotor-side electric current can cause rotor-exciting current transformer dc voltage to raise, the electric current of generator excitation current transformer and meritorious and idlely all can produce vibration.This is because under the situation that double fed induction generators fell in line voltage moment, stator magnetic linkage can not be followed the stator terminal voltage sudden change, thereby can produce DC component, because reducing of integration amount, stator magnetic linkage changes hardly, and rotor continues rotation, can produce bigger slippage, so just can cause the overvoltage and the overcurrent of rotor winding.
Existing using so that the wind-powered electricity generation unit has the technical scheme of low voltage ride-through capability; be that insulated gate bipolar transistor type DC side over-pressure safety device circuit is set in the electrical network circuit; as shown in Figure 1; rotor winding 11 and rotor-side converter 12 a plurality of brachium pontis that are connected in parallel; each brachium pontis comprises two diodes that are connected in series; DC side seals in an insulated gate bipolar transistor type device and an absorption resistance R, these a plurality of diodes; an insulated gate bipolar transistor type device and an absorption resistance R form an independent DC side over-pressure safety device circuit that is provided with.Its shortcoming is:
1. during electric network fault, though rotor-side converter and rotor winding have obtained protection, an independent insulated gate bipolar transistor type DC side over-pressure safety device circuit has increased system cost;
2. the operation of the switching of insulated gate bipolar transistor type DC side over-pressure safety device circuit can produce the transient state impact to network system, causes the risk of damaging network system.
The utility model content
The utility model provides a kind of copped wave device that passes through based on low-voltage, can reduce the bigger electric current of rotor-side to generator and harm current transformer, improves line voltage stability and reduces system cost.
For achieving the above object, the utility model provides a kind of copped wave device that passes through based on low-voltage, it is characterized in that, this device is arranged in the current transformer, copped wave device that should pass through based on low-voltage comprises copped wave resistance device and the device for power switching that is connected in series, and the DC-link device that is connected in parallel with copped wave resistance device and device for power switching.
Above-mentioned current transformer also comprises respectively circuit on side of overhead contact line and the rotor-side circuit that is connected in parallel with the copped wave device that passes through based on low-voltage.
The above-mentioned copped wave device that passes through based on low-voltage is connected with network system by described circuit on side of overhead contact line.
The above-mentioned copped wave device that passes through based on low-voltage is connected with generator by described rotor-side circuit.
Above-mentioned current transformer also comprises the voltage transformer that is connected with network system, and the control circuit that is connected with the device for power switching circuit.
Above-mentioned rotor-side circuit includes three brachium pontis that are connected in parallel; Respectively be connected in series with several diodes on these three brachium pontis; These three brachium pontis connect the three-phase output of generator respectively.
When electrical network breaks down electric voltage dropping; the control circuit control of current transformer makes the current transformer short circuit; with the big transient state overcurrent of the diode current flow in the rotor-side circuit; insulated gate bipolar transistor in the protection rotor-side circuit; and guarantee not off-grid of generator, be equivalent to a common asynchronous generator job.Control circuit is opened device for power switching simultaneously, and it is stable that conducting copped wave resistance device, this copped wave resistance device are kept the voltage of DC-link device, and assurance generator unit low-voltage is passed through work.When electric network fault was eliminated, the control circuit of current transformer stopped the switch-off power switching device, and excision copped wave resistance device makes generator recover normal operating condition.
The copped wave device that the utility model passes through based on low-voltage is compared with existing protective circuit, and its advantage is that the utility model is provided with the copped wave resistance device, and in the time of can guaranteeing that the generating set low-voltage is passed through, the power system stability operation improves line voltage stability;
The utility model is provided with the copped wave resistance device, absorbs the electric current in the circuit, consumes the charge power of dc capacitor, restriction dc voltage, protection DC-link device;
In the utility model, insert some diodes in the rotor-side circuit of current transformer, can reduce the bigger electric current of rotor-side circuit transient state generator and current transformer is impacted harm, improve line voltage stability;
The components and parts of the DC side over-pressure safety device circuit that the utility model passes through traditional low-voltage; be linked in the current transformer; two independent device are merged into the copped wave device that the subsidiary low-voltage of a current transformer is passed through, reduce system cost, and improved the rapidity and the stability of control.
Description of drawings
Fig. 1 is the circuit diagram of the DC side over-pressure safety device circuit of prior art;
The circuit theory diagrams of the copped wave device that Fig. 2 passes through based on low-voltage for the utility model.
Embodiment
Further specify embodiment of the present utility model below in conjunction with accompanying drawing.
As shown in Figure 2, the copped wave device that the utility model passes through based on low-voltage, it comprises copped wave resistance device R1 and the device for power switching V1 that is connected in series, and the DC-link device C1 that is connected in parallel with copped wave resistance device R1 and device for power switching V1.
Copped wave resistance device R1 adopts a resistance in the utility model, and DC-link device C1 adopts an electric capacity, and device for power switching V1 adopts an insulated gate bipolar transistor as device for power switching.This DC-link device C1 effect is keep dc voltage stable, for the rotor-side circuit 212 of current transformer 21 and the active power transmission of circuit on side of overhead contact line 211 provide bridge, for current transformer 21 realizes that its control strategies provide safeguard.The effect of insulated gate bipolar transistor is the conversion of carrying out electric current, can carry out alternating current is transformed to galvanic rectification, perhaps carries out direct current is transformed into the inversion of alternating current.
The copped wave device that the utility model passes through based on low-voltage is arranged in the current transformer 21, and two devices are merged into the current transformer 21 of the copped wave device that a subsidiary low-voltage passes through; This current transformer 21 also comprises respectively circuit on side of overhead contact line 211 and the rotor-side circuit 212 that the copped wave device that passes through based on low-voltage with the utility model is connected in parallel, the voltage transformer that is connected with network system, and control circuit.This voltage transformer also is connected with the control circuit circuit.
Circuit on side of overhead contact line 211 comprises three brachium pontis that are connected in parallel, and is in series with two insulated gate bipolar transistors on every brachium pontis.The copped wave device that the utility model passes through based on low-voltage is connected with network system by this circuit on side of overhead contact line 211.
The copped wave device that passes through based on low-voltage connects generator G by rotor-side circuit 212, and the three-phase output of this generator G is respectively A, B and C.Rotor-side circuit 212 comprises six brachium pontis A1, the A2, B1, B2, C1 and the C2 that are connected in parallel.Wherein respectively be provided with two diodes that are connected in series on A1, B1 and the C1, and respectively be provided with two insulated gate bipolar transistors that are connected in series on A2, B2 and the C2.Device on device on A1, B1 and the C1 and A2, B2 and the C2, it is opposite that it is provided with direction.In this rotor-side circuit 212, connect on every brachium pontis and be provided with a tie point between two electronic devices that are provided with.The tie point of A1 and A2 is exported mutually with the A of generator G and is connected; The tie point of B1 and B2 is exported mutually with the B of generator G and is connected; And the tie point of C1 and C2 is exported mutually with the C of generator G and is connected.
Generator G adopts double fed induction generators, the working method of double fed induction generators is, when generator G rotating speed is lower than with leg speed, generator G is in metasynchronism speed state, this moment, current transformer 21 provided AC excitation to the rotor winding, generator G obtains the part electromagnetic power from current transformer 21, and the power that this part electromagnetic power obtains with the rotor rotation sends electric energy from generator G stator and gives electrical network; When generator G rotating speed surpassed with leg speed, generator G was in supersynchronous fast state, and current transformer 21 energy flow to reverse, and this moment, generator G sent electric energy to electrical network by stator and rotor simultaneously; When generator G rotating speed equaled with leg speed, current transformer 21 provided DC excitation to the rotor winding.Double fed induction generators changes the frequency of electric current in the generator G rotor winding by the cycle of the insulated gate bipolar transistor trigger end in the control current transformer 21, thereby keeps the power frequency of generator G stator side constant, realizes variable speed constant frequency control.
The control circuit of current transformer 21 respectively with circuit on side of overhead contact line 211 and rotor-side circuit 212 in each insulated gate bipolar transistor of being comprised, and the base stage of device for power switching V1 connects, this base stage is the trigger end of insulated gate bipolar transistor, this control circuit is by sending trigger impulse to this trigger end, with shutoff and the conducting of controlling each insulated gate bipolar transistor.
Generator G also is connected with network system, is connected in series with the circuit breaker 22 that is incorporated into the power networks between this generator G and the network system, and the circuit breaker that is incorporated into the power networks is the stator of the generator G switch that is incorporated into the power networks, and it is arranged in the cabinet that is incorporated into the power networks of current transformer 21.When wind behaviour meets when being incorporated into the power networks condition, voltage when the detecting element of current transformer 21 detects generator G zero load, the voltage of phase place and frequency and electrical network, phase place is with after frequency is consistent, the closure circuit breaker 22 that is incorporated into the power networks, generator G switches to power generation mode from synchronous mode, generator G is connected to the grid, when wind behaviour does not meet when being incorporated into the power networks condition, the torque that the control circuit of current transformer 21 is provided with the rotor current transformer is given as 0, power factor is 1, when the detecting element of current transformer 21 detects no-voltage and zero current by the circuit breaker 22 that is incorporated into the power networks, then disconnect the circuit breaker 22 that is incorporated into the power networks, generator G is disconnected from electrical network.
Operation workflow of the present utility model is as follows:
When electrical network breaks down, electric network electric voltage drop because the stator magnetic linkage of generator G can not be followed the variation of stator voltage, makes rotor produce bigger slippage during to national grid specified standard 15%, causes the overvoltage and the overcurrent of the rotor winding of generator G.The voltage transformer of current transformer 21 detects line voltage and breaks down; its control circuit control current transformer 21 takes off and carries; and automatically perform abandon the instruction; stop A2 in rotor-side circuit 212; the trigger end of the insulated gate bipolar transistor on B2 and the C2 brachium pontis sends trigger impulse; thereby turn-off these insulated gate bipolar transistors; brachium pontis A1 in the conducting rotor-side circuit 212; diode on B1 and the C1; make 212 short circuits of rotor-side circuit; the impulse current that the electrical network short circuit is caused flows through through this diode current flow; with the big transient state overcurrent of diode current flow; protected the insulated gate bipolar transistor in the rotor-side circuit 212; the generator G that guarantees this moment simultaneously not off-grid and low-voltage passes through, and is equivalent to a common asynchronous generator job.
Simultaneously, control circuit sends trigger impulse to device for power switching V1 trigger end, thereby opens device for power switching V1, conducting copped wave resistance device R1, this copped wave resistance device R1 absorbs the electric current in the current transformer rotor-side circuit 212, reduces DC-link device C1 and goes up DC bus-bar voltage U
DC, consuming the charge power of DC-link device C1, the voltage of keeping DC-link device C1 is stable, and remains in the scope that operate as normal allows, and guarantees that generator G unit low-voltage passes through work.
When the standard that line voltage passes through according to low-voltage is recovered gradually, when promptly electric network fault was eliminated, the voltage transformer of current transformer 21 detected line voltage and recovers, and detects DC bus-bar voltage U
DCAt nominal working range.The control circuit of current transformer 21 stops to send trigger impulse to device for power switching V1 trigger end, thus switch-off power switching device V1, and excision copped wave resistance device R1 makes generator G recover normal operating condition.
Although content of the present utility model has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to restriction of the present utility model.After those skilled in the art have read foregoing, for multiple modification of the present utility model with to substitute all will be conspicuous.Therefore, protection range of the present utility model should be limited to the appended claims.
Claims (6)
1. copped wave device that passes through based on low-voltage, it is characterized in that, this device is arranged in the current transformer (21), the described copped wave device that passes through based on low-voltage comprises copped wave resistance device (R1) and the device for power switching (V1) that is connected in series, and the DC-link device (C1) that is connected in parallel with described copped wave resistance device (R1) and described device for power switching (V1).
2. the copped wave device that passes through based on low-voltage as claimed in claim 1 is characterized in that, described current transformer (21) also comprises respectively circuit on side of overhead contact line (211) and the rotor-side circuit (212) that is connected in parallel with the described copped wave device that passes through based on low-voltage.
3. the copped wave device that passes through based on low-voltage as claimed in claim 2 is characterized in that, the described copped wave device that passes through based on low-voltage is connected with network system by described circuit on side of overhead contact line (211).
4. the copped wave device that passes through based on low-voltage as claimed in claim 2 is characterized in that, the described copped wave device that passes through based on low-voltage is connected with generator (G) by described rotor-side circuit (212).
5. the copped wave device that passes through based on low-voltage as claimed in claim 3, it is characterized in that, described current transformer (21) also comprises the voltage transformer that is connected with described network system, and the control circuit that is connected with the trigger end circuit of described device for power switching (V1).
6. the copped wave device that passes through based on low-voltage as claimed in claim 4 is characterized in that described rotor-side circuit (212) includes brachium pontis A1, B1 and the C1 that is connected in parallel; Be connected in series with several diodes on described each bar brachium pontis; Described each bar brachium pontis connects the three-phase output of generator (G) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201341956U CN201682292U (en) | 2010-03-18 | 2010-03-18 | Chopping device based on low-voltage ride-through |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201341956U CN201682292U (en) | 2010-03-18 | 2010-03-18 | Chopping device based on low-voltage ride-through |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201682292U true CN201682292U (en) | 2010-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201341956U Expired - Fee Related CN201682292U (en) | 2010-03-18 | 2010-03-18 | Chopping device based on low-voltage ride-through |
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| CN (1) | CN201682292U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001245A (en) * | 2011-09-16 | 2013-03-27 | 通用电气公司 | Inrush current protection for wind turbines and wind farms |
| CN105406501A (en) * | 2015-12-21 | 2016-03-16 | Abb技术有限公司 | Rectifier station, high-voltage direct-current power transmission system and fault eliminating method |
-
2010
- 2010-03-18 CN CN2010201341956U patent/CN201682292U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103001245A (en) * | 2011-09-16 | 2013-03-27 | 通用电气公司 | Inrush current protection for wind turbines and wind farms |
| CN103001245B (en) * | 2011-09-16 | 2015-10-28 | 通用电气公司 | Wind-driven generator and transformer is connected to the method for electrical network after electric network fault |
| US9745959B2 (en) | 2011-09-16 | 2017-08-29 | General Electric Company | Inrush current protection for wind turbines and wind farms |
| CN105406501A (en) * | 2015-12-21 | 2016-03-16 | Abb技术有限公司 | Rectifier station, high-voltage direct-current power transmission system and fault eliminating method |
| CN105406501B (en) * | 2015-12-21 | 2020-07-24 | Abb电网瑞士股份公司 | Rectifying station, high-voltage direct-current power transmission system and fault eliminating method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SUZHOU TITPWE WIND ENERGY TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: SUZHOU TEPU WIND ENERGY TECHNOLOGY CO., LTD. Effective date: 20121225 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121225 Address after: Five mountain city high tech Zone of Suzhou City, Jiangsu Province, No. 528 215153 Patentee after: Suzhou Titpwe Wind Energy Technology Co., Ltd. Address before: Five mountain city high tech Zone of Suzhou City, Jiangsu Province, No. 528 215153 Patentee before: Suzhou TITP Wind Energy Technology Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101222 Termination date: 20150318 |
|
| EXPY | Termination of patent right or utility model |