CN103441530A - Wind power generating device group high and low voltage crossing device, system and method - Google Patents
Wind power generating device group high and low voltage crossing device, system and method Download PDFInfo
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Abstract
The invention discloses a wind power generating device group high and low voltage crossing device, a system and a method. The device comprises a high and low voltage crossing circuit, a chopper circuit and a control unit. The high and low voltage crossing circuit is connected between a current transformer and a power generating device. The chopper circuit is connected on a DC bus of the current transformer. The control unit is connected on the DC bus of the current transformer. The control unit is also connected with the high and low voltage crossing circuit and the chopper circuit. The high and low voltage crossing circuit further comprises a full-control type power electronic switch device circuit and an energy consuming resistor. The full-control type power electronic switch device circuit further comprises a chopper tube and a freewheeling tube. The chopper tube is connected in series with the freewheeling tube. The chopper tube is connected in parallel with the energy consuming resistor. The invention is simple in structure, quite low in cost, and easy to install and maintain so that a wind power generating device group has high and low voltage crossing capacity. Therefore, during a fault period of an electrical power system, continuous operation of a network side current transformer is maintained by the wind power generating device, and thus a strong support is provided for rapid recovery of the grid fault.
Description
Technical field
The present invention relates to wind power generation field, especially relate to a kind of high-low voltage traversing device, system and method thereof that is applied to wind turbine generator.
Background technology
Advocate today of green energy resource in the world, wind power generation has obtained development at full speed as a kind of reproducible new forms of energy, and the wind power generation ratio shared at mains supply is also in continuous improve simultaneously.In the wind turbine generator running, electric network fault may cause line voltage rise suddenly or fall, thereby cause wind power plant the phenomenons such as overvoltage, overcurrent or rise of rotational speed to occur in short-term, make a large amount of wind turbine generator off-grids, and make the bad stability of electric power system.Therefore, the stability of the grid-connected quality of wind turbine generator and operation is extremely important.Present grid-connected blower fan requires to have become a state compulsion standard by the low voltage crossing test of national DianKeYuan, so the substantially every Fans of the equipment of low voltage crossing all must possess, but high voltage crossing is owing to there is no the state compulsion requirement, so it is less to possess the equipment of high voltage crossing function, research is also few.
Double-fed wind power generator group based on double-fed current transformer, control complete machine power by controlling rotor current, and stator directly is connected with electrical network.When line voltage occurs to raise suddenly or falls, its rotor-end there will be overvoltage, overcurrent, and the busbar voltage of connection network side converter and pusher side current transformer is raise, and this can constitute a serious threat to the safety of current transformer, if do not taken measures, can cause current transformer to damage, reduce the stability of electrical network.When falling appears in line voltage, double-fed wind power generator is under rated voltage during steady operation, and its stator magnetic linkage vector magnitude is constant and with same leg speed rotation.Simultaneously, magnetic linkage induces a direct-current component, and this electric current can induce a counter magnetic field, to keep magnetic linkage, can not suddenly change.Due to the existence of stator resistance and stator winding leakage inductance, make this direct-current component to decay with exponential form, until the amplitude of flux linkage vector amplitude while being transitioned into corresponding subnormal voltage operation.Therefore, the DC component in stator magnetic linkage is to cause the low voltage crossing technology to be difficult to the basic reason realized.Due to the double-fed wind power generator rotor rotating speed and revolutional slip higher, thereby cause the rotor-side overvoltage.And, because leakage inductance between stator resistance and winding is less, the stator magnetic linkage DC component can only cause stator and rotor side overcurrent by this leakage inductance coupling, also there is the magnetic linkage transient process in rotor-side, makes its overcurrent more serious.
In order to protect wind-driven generator and the current transformer under special operation condition (as high-low voltage passes through); at present; low voltage ride through device generally all is housed in the double-fed wind power generator group, under transient fault, generally with rotor current bypass measure, protects generator amature and current transformer.More employing be exactly active crowbar circuit, its principle is that the brilliant lock of passive type crowbar circuit is changed into to all-controlling power electronics device, and when electrical network breaks down, the controller side converter is closed, open the crowbar circuit simultaneously, the energy of generator amature side is consumed.When power system restoration, control the crowbar circuit and close, and the uncapping machine side converter, provide reactive power support to electrical network, help the fast quick-recovery of electrical network, thereby realize low voltage ride-through function.In order to realize rotor current bypass measure, now the all-controlling power electronics devices that adopt are as controlled switch more, but, along with the increase of fan capacity, all-controlling power electronics device have been proposed to higher capacity requirement.And, along with the change of by-pass current is large, due to the stray capacitance existed in circuit, inductance etc., also more and more higher to the performance requirement of low voltage ride through device.
In the middle of prior art, by Xuzhou China Mining Drives & Automation Co., Ltd., continent, Beijing, can development in science and technology Co., Ltd be applied on 02 07th, 2012, and open on 04 11st, 2012, the Chinese invention patent application that publication No. is CN102412597A, disclose a kind of low-voltage traversing and device, be applicable to the high-power wind power generation field.Its method realizes by falling test section, fall judgment part and trigger action partly completes, and as shown in Figure 1, its device comprises two way convertor, inverter controller and active crow bar (Crowbar) module.This patent application adopts the Crowbar circuit to realize the control to low voltage crossing, has effectively prevented the secondary overcurrent, is conducive to the recovery of electrical network, and ride-through capability is strong, effective.But this patent application, when being applied to large capacity Wind turbine, is taked the mode of many Crowbar parallel connection, increased the complexity of controlling difficulty and system.Simultaneously, it can only tackle low voltage crossing, when blower fan carries out high voltage crossing, also needs other a set of equipment.
Summary of the invention
In view of this, the object of the present invention is to provide the high low voltage ride through device of a kind of wind turbine generator, system and method thereof, make wind turbine generator possess the high-low voltage ride-through capability simultaneously, make wind-driven generator during electric power system fault, the continuous service that has kept the net side converter, and can make quickly the pusher side current transformer restart, for the fast quick-recovery of electric network fault provides strong support.
In order to realize the foregoing invention purpose, the present invention specifically provides the technic relization scheme of the high low voltage ride through device of a kind of wind turbine generator, the high low voltage ride through device of a kind of wind turbine generator, comprise: high-low pressure passes through circuit, chopper circuit and control unit, described high-low pressure passes through circuit and is connected between current transformer and generator, described chopper circuit is connected on the DC bus of described current transformer, described control unit is connected on the DC bus of described current transformer, and described control unit also passes through circuit with described high-low pressure and is connected with described chopper circuit.Described high-low pressure passes through circuit and further comprises full-control type power electronic switch device circuit and energy consumption resistor.Described full-control type power electronic switch device circuit further comprises copped wave pipe and continued flow tube, described copped wave pipe and continued flow tube series connection, and described copped wave pipe is in parallel with described energy consumption resistor;
When comprising that fault that line voltage falls suddenly causes the rotor current of the DC bus-bar voltage of described current transformer or described generator to rise to certain threshold values, the copped wave pipe conducting of described full-control type power electronic switch device circuit, the continued flow tube of described full-control type power electronic switch device circuit turn-offs, thereby make the rotor of described generator and described current transformer produce bypass, energy is consumed in to described energy consumption resistor, makes wind turbine generator realize low voltage crossing;
When the rotor current of the DC bus-bar voltage of described current transformer or described generator returns to certain threshold values, the copped wave pipe of described full-control type power electronic switch device circuit turn-offs, the continued flow tube conducting of described full-control type power electronic switch device circuit, described energy consumption resistor is carried out to afterflow, thereby can start the pusher side current transformer of described current transformer;
When comprising that fault that line voltage rises sharply causes the rotor current of the DC bus-bar voltage of described current transformer or described generator to rise to certain threshold values, described control unit is controlled described chopper circuit conducting, discharge the energy on described DC bus, thereby reduce the voltage on described DC bus, make wind turbine generator realize high voltage crossing.
Preferably, described high-low pressure passes through circuit and also comprises three-phase not control rectifier, absorbing circuit and full-control type power electronic switching device absorbing circuit, and described three-phase not control rectifier, absorbing circuit, full-control type power electronic switch device circuit, full-control type power electronic switching device absorbing circuit is connected successively with energy consumption resistor;
Described three-phase not control rectifier is used for the three-phase alternating voltage from described current transformer output and described generator amature side is carried out to the rectification processing;
Described absorbing circuit comprises resistance R in parallel 1 and capacitor C 1, for to through described three-phase not the harmonic wave of the output voltage of control rectifier rectification carry out the filtering processing;
Described full-control type power electronic switching device absorbing circuit, the harmonic wave produced in switching process for absorbing described full-control type power electronic switch device circuit copped wave pipe and continued flow tube.
Preferably, described full-control type power electronic switching device absorbing circuit comprises two groups of absorption electronic circuits of mutually connecting, and described two groups absorb the two ends that electronic circuit is connected in parallel on described copped wave pipe and continued flow tube separately.
Preferably, described absorption electronic circuit adopts after resistance and capacitances in series branch road or independent capacitive branch or resistance and diodes in parallel the branch road with capacitances in series again.
Preferably, described high-low pressure passes through circuit and comprises two groups of above full-control type power electronic switch device circuits, described two groups of above full-control type power electronic switch device circuits are parallel with one another, all are parallel with described full-control type power electronic switching device absorbing circuit at the two ends of described full-control type power electronic switch device circuit.
Preferably, described full-control type power electronic switch device circuit adopt include but not limited to insulated gate bipolar transistor npn npn or integrated gate commutated thyristor or turn-off thyristor at interior switch control assembly as the full-control type power electronic switching device.Described full-control type power electronic switch device circuit comprises the full-control type power electronic switching device more than three, and described full-control type power electronic switching device more than three is connected mutually.
Preferably, in wind turbine generator, realize in the process of low voltage crossing, start the net side converter of described current transformer, and the power factor of regulating described net side converter, thereby reactive power support provided to described electrical network.
Preferably, described chopper circuit comprises the first switching tube, second switch pipe, copped wave resistance and copped wave electric capacity.Described the first switching tube and second switch pipe string connection, described copped wave Capacitance parallel connection is at the two ends of described the first switching tube and second switch pipe string connection circuit, and described copped wave resistance is connected in parallel on the two ends of described the first switching tube.When comprising that fault that line voltage rises sharply causes the rotor current of the DC bus-bar voltage of described current transformer or described generator to rise to certain threshold values, the second switch pipe conducting of described chopper circuit, described the first switching tube turn-offs, the branch road formed by described second switch pipe and described copped wave resistance discharges the energy on described DC bus, thereby reduce the voltage on described DC bus, make wind turbine generator realize high voltage crossing.
Preferably, described control unit is integrated in the control device of described current transformer, and described chopper circuit and described energy consumption resistor are integrated in same resistance box.
Preferably, described high low voltage ride through device is applied to the high low voltage crossing of double-feedback aerogenerator group.
The present invention also specifically provides the technic relization scheme of the high low voltage ride through system of a kind of wind turbine generator in addition, the high low voltage ride through system of a kind of wind turbine generator comprises: the high low voltage ride through device of wind turbine generator as above, current transformer, electrical network and generator.The stator of described generator is connected with described electrical network, the rotor of described generator is connected with the pusher side of described current transformer, the net side of described current transformer is connected with described electrical network, and the input three-phase that the high-low pressure of the high low voltage ride through device of described wind turbine generator passes through circuit is connected with the pusher side of described current transformer and the rotor of described generator respectively; Described chopper circuit and described control unit are connected on the DC bus of described current transformer, and described control unit also passes through circuit with described high-low pressure respectively and is connected with described chopper circuit.
The present invention also specifically provides the technic relization scheme of the high low-voltage ride-through method of a kind of wind turbine generator in addition, the high low-voltage ride-through method of a kind of wind turbine generator, high low voltage ride through device comprises that high-low pressure passes through circuit, chopper circuit and control unit, described high-low pressure passes through circuit and further comprises full-control type power electronic switch device circuit and energy consumption resistor, described full-control type power electronic switch device circuit further comprises copped wave pipe and continued flow tube, and described high low-voltage ride-through method comprises the following steps:
Low voltage crossing process: when comprising that fault that line voltage falls suddenly causes the rotor current of the DC bus-bar voltage of described current transformer or described generator to rise to certain threshold values, the copped wave pipe conducting of described full-control type power electronic switch device circuit, the continued flow tube of described full-control type power electronic switch device circuit turn-offs, thereby make the rotor of described generator and described current transformer produce bypass, energy is consumed in to described energy consumption resistor, makes wind turbine generator realize low voltage crossing;
Low-voltage crossing recovery process: when the rotor current of the DC bus-bar voltage of described current transformer or described generator returns to certain threshold values, the copped wave pipe of described full-control type power electronic switch device circuit turn-offs, the continued flow tube conducting of described full-control type power electronic switch device circuit, described energy consumption resistor is carried out to afterflow, thereby can start the pusher side current transformer of described current transformer;
High voltage crossing process: when comprising that fault that line voltage rises sharply causes the rotor current of the DC bus-bar voltage of described current transformer or described generator to rise to certain threshold values, described control unit is controlled described chopper circuit conducting, discharge the energy on described DC bus, thereby reduce the voltage on described DC bus, make wind turbine generator realize high voltage crossing.
The high low voltage ride through device of wind turbine generator, system and the method thereof that by implementing the invention described above, provide have following technique effect:
(1) the present invention makes wind turbine generator possess the high-low voltage ride-through capability simultaneously, make wind-driven generator during electric power system fault, the continuous service that has kept the net side converter, and can make quickly the pusher side current transformer restart, for the fast quick-recovery of electric network fault provides strong support;
(2) apparatus of the present invention and system configuration thereof are simple, and cost is extremely low, are easy to installation and maintenance simultaneously;
(3) the inventive method carry out fast, control simple, reliable, power consumption is lower.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is prior art dual feedback wind power generation system low-voltage crossing controller main circuit topological structure figure;
Fig. 2 is the system architecture diagram of a kind of embodiment of the high low voltage ride through system of double-fed wind power generator of the present invention;
Fig. 3 is the main circuit topological structure figure of a kind of embodiment of the high low voltage ride through device of double-fed wind power generator of the present invention;
Fig. 4 is the main circuit topological structure figure of the another kind of embodiment of the high low voltage ride through device of double-fed wind power generator of the present invention;
Fig. 5 is the circuit theory diagrams of three kinds of embodiments of full-control type power electronic switching device absorbing circuit in the high low voltage ride through device of double-fed wind power generator of the present invention;
Fig. 6 is the main circuit topological structure figure of high the third embodiment of low voltage ride through device of double-fed wind power generator of the present invention;
Fig. 7 is the circuit topological structure figure of a kind of embodiment chopper circuit of the high low voltage ride through device of double-fed wind power generator of the present invention;
In figure: the 100-high-low pressure passes through circuit, 101-chopper circuit, 102-control unit, the 103-current transformer, 1031-net side converter, 1032-pusher side current transformer, the 104-electrical network, the 105-generator, the 200-three-phase is control rectifier not, the 300-absorbing circuit, 400-full-control type power electronic switch device circuit, 401-copped wave pipe, 402-continued flow tube, 500-full-control type power electronic switching device absorbing circuit, the 600-energy consumption resistor.
Embodiment
For quote and know for the purpose of, by the technical term that hereinafter uses, write a Chinese character in simplified form or abridge and be described below:
Crowbar: active crowbar circuit is a kind of power protecting circuit, can the fast shut-off power supply when voltage/current exceeds limited range; In wind power generation field, when line voltage falls suddenly, very large voltage and current appears in rotor, usually adopt the Crowbar circuit to carry out the bypass rotor-side converter;
IGBT:Insulated Gate Bipolar Transistor, insulated gate bipolar transistor;
IGCT:Intergrated Gate Commutated Thyristors, integrated gate commutated thyristor;
GTO:Giant Transistor, power transistor.
For the purpose, technical scheme and the advantage that make the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
To as shown in accompanying drawing 7, provided the specific embodiment of the high low voltage ride through device of wind turbine generator of the present invention, system and method thereof as accompanying drawing 2, below in conjunction with the drawings and specific embodiments, the invention will be further described.
The specific embodiment of the high low voltage ride through device of a kind of wind turbine generator as shown in accompanying drawing 2 and accompanying drawing 3 comprises: high-low pressure passes through circuit 100, chopper circuit 101 and control unit 102.High-low pressure passes through circuit 100 and is connected between current transformer 103 and generator 105, chopper circuit 101 is connected on the DC bus of current transformer 103, control unit 102 is connected on the DC bus of current transformer 103, and control unit 102 also passes through circuit 100 with high-low pressure and is connected with chopper circuit 101.High-low pressure passes through circuit 100 and further comprises full-control type power electronic switch device circuit 400 and energy consumption resistor 600.Full-control type power electronic switch device circuit 400 further comprises copped wave pipe 401 and continued flow tube 402, copped wave pipe 401 and continued flow tube 402 series connection, and copped wave pipe 401 is in parallel with energy consumption resistor 600;
When comprising that fault that electrical network 104 voltages fall suddenly causes the rotor current of the DC bus-bar voltage of current transformer 103 or generator 105 to rise to certain threshold values, copped wave pipe 401 conductings of full-control type power electronic switch device circuit 400, the continued flow tube 402 of full-control type power electronic switch device circuit 400 turn-offs, thereby make the rotor of generator 105 and current transformer 103 produce bypass, energy is consumed in to energy consumption resistor 600, makes wind turbine generator realize low voltage crossing;
When the rotor current of the DC bus-bar voltage of current transformer 103 or generator 105 returns to certain threshold values, the copped wave pipe 401 of full-control type power electronic switch device circuit 400 turn-offs, continued flow tube 402 conductings of full-control type power electronic switch device circuit 400, energy consumption resistor 600 is carried out to afterflow, thereby can start the pusher side current transformer 1032 of current transformer 103;
When the fault that comprises electrical network 104 voltage swells causes the rotor current of the DC bus-bar voltage of current transformer 103 or generator 105 to rise to certain threshold values, control unit 102 is controlled chopper circuit 101 conductings, discharge the energy on DC bus, thereby the voltage on the reduction DC bus, make wind turbine generator realize high voltage crossing.
Wherein, conducting energy consumption resistor 600 when copped wave pipe 401 passes through for carrying out high-low voltage; 402 of continued flow tubes carry out afterflow for conducting after passing through at high-low voltage for the energy consumption resistor 600 to perceptual, with protection full-control type power electronic switch device circuit 400.
The specific embodiment of the invention realizes that by a covering device high-low voltage passes through simultaneously, thereby make wind turbine generator during electric power system fault, maintain the closure of stator contactor, guaranteed the continuous service of wind-driven generator networking side converter 1031, and can make quickly pusher side current transformer 1032 restart, fault recovery to electrical network has formed strong support, makes wind turbine generator have stronger high-low voltage ride-through capability under the prerequisite of high reliability.
As a kind of preferably specific embodiment of the present invention, in wind turbine generator, realize in the process of low voltage crossing, start the net side converter 1031 of current transformer 103, and regulate the power factor of net side converter 1031, thereby can provide reactive power support to electrical network 104 where necessary.
High-low pressure passes through circuit 100 and also further comprises three-phase not control rectifier 200, absorbing circuit 300 and full-control type power electronic switching device absorbing circuit 500.Three-phase not control rectifier 200, absorbing circuit 300, full-control type power electronic switch device circuit 400, full-control type power electronic switching device absorbing circuit 500 is connected successively with energy consumption resistor 600.Three-phase not control rectifier 200 carries out the rectification processing for the three-phase alternating voltage to from current transformer 103 outputs and generator 105 rotor-side.Absorbing circuit 300 comprises resistance R in parallel 1 and capacitor C 1, for to through three-phase not the harmonic wave of the output voltage of control rectifier 200 rectifications carry out the filtering processing.Full-control type power electronic switching device absorbing circuit 500, the harmonic wave produced in switching process for absorbing full-control type power electronic switch device circuit 400 copped wave pipes 401 and continued flow tube 402.Wherein, the three-phase not rear end of control rectifier 200 has increased absorbing circuit 300, and to the protection three-phase, control rectifier 200 and full-control type power electronic switch device circuit 400 can not play very large effect.
As shown in Figure 3, this specific embodiment adopts upper pipe for copped wave pipe 401, and lower pipe is continued flow tube 402, the mode that copped wave pipe 401 is in parallel with energy consumption resistor 600.As another kind of specific embodiment of the present invention, as shown in Figure 4, also can adopt pipe is continued flow tube 402, and lower pipe is copped wave pipe 401, the mode that copped wave pipe 401 is in parallel with energy consumption resistor 600.Wherein, full-control type power electronic switch device circuit 400 adopt include but not limited to insulated gate bipolar transistor npn npn (IGBT) or integrated gate commutated thyristor (IGCT) or turn-off thyristor (GTO) at interior switch control assembly as the full-control type power electronic switching device.
Full-control type power electronic switching device absorbing circuit 500 comprises two groups of absorption electronic circuits of mutually connecting, and two groups absorb the two ends that electronic circuit is connected in parallel on copped wave pipe 401 and continued flow tube 402 separately.As shown in Figure 5, absorbing electronic circuit can adopt as the A in figure, B, tri-kinds of versions of C.Wherein, the absorption electronic circuit of A structure adopts resistance R and the branch road form of connecting with capacitor C again after diode D parallel connection; The B structure adopts resistance R and capacitor C series arm form; C-structure adopts independent capacitor C branch road form.If the switching frequency of copped wave pipe 401 and continued flow tube 402 is very low, the harmonic wave produced is less, and full-control type power electronic switching device absorbing circuit 500 also can omit.If the switching frequency of copped wave pipe 401 and continued flow tube 402 is higher, the harmonic wave of generation is more, and the effect of full-control type power electronic switching device absorbing circuit 500 is more important.
When the capacity of wind turbine generator is larger, can first the controllable type power electronic device of two or more (not containing two) be connected into to a full-control type power electronic switch device circuit 400, and then by a plurality of full-control type power electronic switch device circuit 400 parallel connections, to improve the ability of its tolerating high voltage and high electric current.Can configure respectively according to required high voltage withstanding ability the series connection quantity of copped wave pipe 401 and continued flow tube 402, and configure the quantity in parallel of full-control type power electronic switch device circuit 400 according to required anti-high current capacity.High-low pressure passes through circuit 100 and comprises two groups of above full-control type power electronic switch device circuits 400, two groups of above full-control type power electronic switch device circuits 400 are parallel with one another, at the two ends of full-control type power electronic switch device circuit 400, all are parallel with full-control type power electronic switching device absorbing circuit 500.As the third specific embodiment of the present invention, as shown in Figure 6, high-low pressure passes through circuit 100 and comprises three groups of full-control type power electronic switch device circuits 400 parallel with one another.
As shown in Figure 7, as a kind of exemplary embodiments of the present invention, chopper circuit 101 further comprises the first switch transistor T 1, second switch pipe T2, copped wave resistance R 3 and copped wave capacitor C 3.The first switch transistor T 1 is connected with second switch pipe T2, and copped wave capacitor C 3 is connected in parallel on the two ends of the first switch transistor T 1 and second switch pipe T2 series circuit, and copped wave resistance R 3 is connected in parallel on the two ends of the first switch transistor T 1.When the fault that comprises electrical network 104 voltage swells causes the rotor current of the DC bus-bar voltage of current transformer 103 or generator 105 to rise to certain threshold values, the second switch pipe T2 conducting of chopper circuit 101, the first switch transistor T 1 is turn-offed, the branch road formed by second switch pipe T2 and copped wave resistance R 3 discharges the energy on DC bus, thereby the voltage on the reduction DC bus, make wind turbine generator realize high voltage crossing.
As a kind of preferred embodiment of the present invention, control unit 102 is integrated in the control device of described current transformer 103, and chopper circuit 101 is integrated in same resistance box with energy consumption resistor 600, can effectively reduce costs, and is conducive to install simultaneously.As a kind of exemplary embodiments of the present invention, high low voltage ride through device is applied to the high low voltage crossing of double-feedback aerogenerator group.
The specific embodiment of the high low voltage ride through system of a kind of wind turbine generator as shown in Figure 2 comprises: the high low voltage ride through device of aforesaid wind turbine generator, current transformer 103, electrical network 104 and generator 105.The stator of generator 105 is connected with electrical network 104, the rotor of generator 105 is connected with the pusher side of current transformer 103, the net side of current transformer 103 is connected with electrical network 104, and input three-phase A, B, C that the high-low pressure of the high low voltage ride through device of wind turbine generator passes through circuit 100 are connected with the rotor of generator 105 with the pusher side of current transformer 103 respectively.Chopper circuit 101 and control unit 102 are connected on the DC bus of current transformer 103, and control unit 102 also passes through circuit 100 with high-low pressure respectively and is connected with chopper circuit 101.
The specific embodiment of the high low-voltage ride-through method of a kind of wind turbine generator, high low voltage ride through device comprises that high-low pressure passes through circuit 100, chopper circuit 101 and control unit 102.High-low pressure passes through circuit 100 and further comprises full-control type power electronic switch device circuit 400 and energy consumption resistor 600, full-control type power electronic switch device circuit 400 further comprises copped wave pipe 401 and continued flow tube 402, and high low-voltage ride-through method comprises the following steps:
Low voltage crossing process: when comprising that fault that electrical network 104 voltages fall suddenly causes the rotor current of the DC bus-bar voltage of current transformer 103 or generator 105 to rise to certain threshold values, copped wave pipe 401 conductings of full-control type power electronic switch device circuit 400, the continued flow tube 402 of full-control type power electronic switch device circuit 400 turn-offs, thereby make the rotor of generator 105 and current transformer 103 produce bypass, energy is consumed in to energy consumption resistor 600, makes wind turbine generator realize low voltage crossing;
Low-voltage crossing recovery process: when the rotor current of the DC bus-bar voltage of current transformer 103 or generator 105 returns to certain threshold values, the copped wave pipe 401 of full-control type power electronic switch device circuit 400 turn-offs, continued flow tube 402 conductings of full-control type power electronic switch device circuit 400, energy consumption resistor 600 is carried out to afterflow, thereby can start the pusher side current transformer 1032 of current transformer 103;
High voltage crossing process: when the fault that comprises electrical network 104 voltage swells causes the rotor current of the DC bus-bar voltage of current transformer 103 or generator 105 to rise to certain threshold values, control unit 102 is controlled chopper circuit 101 conductings, discharge the energy on DC bus, thereby the voltage on the reduction DC bus, make wind turbine generator realize high voltage crossing.
The technical scheme that the specific embodiment of the invention is described when possessing high low voltage ride-through function, also have carry out fast, control simple, reliable, power consumption is lower has the characteristics such as high low voltage crossing.In the low voltage crossing process, increase by the rotor by-pass at generator 105 the high low voltage ride through device of wind turbine generator that the present invention describes, according to DC bus-bar voltage, it is controlled, thereby make wind turbine generator during electric power system fault, maintain the closure of stator contactor, guaranteed the continuous service of wind-driven generator networking side converter 1031, and can make quickly pusher side current transformer 1032 restart, recovery to electric network fault has formed strong support, make blower fan have stronger low voltage ride-through capability under the prerequisite of high reliability, and, in the high voltage crossing process, utilize chopper circuit 101 to discharge the energy on DC bus, thus reduce the voltage on DC bus, make wind turbine generator there is stronger high voltage crossing ability.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that between each embodiment, identical similar part is mutually referring to getting final product.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction.Although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention.Any those of ordinary skill in the art, in the situation that do not break away from Spirit Essence of the present invention and technical scheme, all can utilize method and the technology contents of above-mentioned announcement to make many possible changes and modification to technical solution of the present invention, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, be equal to replacements, equivalence changes and modify, all still belong in the scope that technical solution of the present invention protects.
Claims (12)
1. the high low voltage ride through device of wind turbine generator, it is characterized in that, comprise: high-low pressure passes through circuit (100), chopper circuit (101) and control unit (102), described high-low pressure passes through circuit (100) and is connected between current transformer (103) and generator (105), described chopper circuit (101) is connected on the DC bus of described current transformer (103), described control unit (102) is connected on the DC bus of described current transformer (103), described control unit (102) also passes through circuit (100) with described high-low pressure and is connected with described chopper circuit (101), described high-low pressure passes through circuit (100) and further comprises full-control type power electronic switch device circuit (400) and energy consumption resistor (600), described full-control type power electronic switch device circuit (400) further comprises copped wave pipe (401) and continued flow tube (402), described copped wave pipe (401) and continued flow tube (402) series connection, and described copped wave pipe (401) is in parallel with described energy consumption resistor (600),
When comprising that fault that electrical network (104) voltage falls suddenly causes the rotor current of the DC bus-bar voltage of described current transformer (103) or described generator (105) to rise to certain threshold values, copped wave pipe (401) conducting of described full-control type power electronic switch device circuit (400), the continued flow tube (402) of described full-control type power electronic switch device circuit (400) turn-offs, thereby make the rotor of described generator (105) and described current transformer (103) produce bypass, energy is consumed in to described energy consumption resistor (600), make wind turbine generator realize low voltage crossing,
When the rotor current of the DC bus-bar voltage of described current transformer (103) or described generator (105) returns to certain threshold values, the copped wave pipe (401) of described full-control type power electronic switch device circuit (400) turn-offs, continued flow tube (402) conducting of described full-control type power electronic switch device circuit (400), described energy consumption resistor (600) is carried out to afterflow, thereby can start the pusher side current transformer (1032) of described current transformer (103);
When the fault that comprises electrical network (104) voltage swells causes the rotor current of the DC bus-bar voltage of described current transformer (103) or described generator (105) to rise to certain threshold values, described control unit (102) is controlled described chopper circuit (101) conducting, discharge the energy on described DC bus, thereby reduce the voltage on described DC bus, make wind turbine generator realize high voltage crossing.
2. the high low voltage ride through device of a kind of wind turbine generator according to claim 1, it is characterized in that: described high-low pressure passes through circuit (100) and also comprises three-phase not control rectifier (200), absorbing circuit (300) and full-control type power electronic switching device absorbing circuit (500), and described three-phase not control rectifier (200), absorbing circuit (300), full-control type power electronic switch device circuit (400), full-control type power electronic switching device absorbing circuit (500) and energy consumption resistor (600) is connected successively;
Described three-phase not control rectifier (200) carries out the rectification processing for the three-phase alternating voltage to from described current transformer (103) output and described generator (105) rotor-side;
Described absorbing circuit (300) comprises resistance R in parallel 1 and capacitor C 1, for to through described three-phase not the harmonic wave of the output voltage of control rectifier (200) rectification carry out the filtering processing;
Described full-control type power electronic switching device absorbing circuit (500), the harmonic wave produced in switching process for absorbing described full-control type power electronic switch device circuit (400) copped wave pipe (401) and continued flow tube (402).
3. the high low voltage ride through device of a kind of wind turbine generator according to claim 2, it is characterized in that: described full-control type power electronic switching device absorbing circuit (500) comprises two groups of absorption electronic circuits of mutually connecting, and described two groups absorb the two ends that electronic circuit is connected in parallel on described copped wave pipe (401) and continued flow tube (402) separately.
4. the high low voltage ride through device of a kind of wind turbine generator according to claim 3, is characterized in that: described absorption electronic circuit employing resistance (R) and electric capacity (C) series arm or independent electric capacity (C) branch road or resistance (R) and the branch road of connecting with electric capacity (C) again after diode (D) parallel connection.
5. according to the high low voltage ride through device of the described a kind of wind turbine generator of arbitrary claim in claim 2,3,4, it is characterized in that: described high-low pressure passes through circuit (100) and comprises two groups of above full-control type power electronic switch device circuits (400), described two groups of above full-control type power electronic switch device circuits (400) are parallel with one another, at the two ends of described full-control type power electronic switch device circuit (400), all are parallel with described full-control type power electronic switching device absorbing circuit (500).
6. the high low voltage ride through device of a kind of wind turbine generator according to claim 5, it is characterized in that: described full-control type power electronic switch device circuit (400) adopt include but not limited to insulated gate bipolar transistor npn npn or integrated gate commutated thyristor or turn-off thyristor at interior switch control assembly as the full-control type power electronic switching device, described full-control type power electronic switch device circuit (400) comprises the full-control type power electronic switching device more than three, and described full-control type power electronic switching device more than three is connected mutually.
7. according to the high low voltage ride through device of the described a kind of wind turbine generator of arbitrary claim in claim 2,3,4,6, it is characterized in that: in wind turbine generator, realize in the process of low voltage crossing, start the net side converter (1031) of described current transformer (103), and the power factor of regulating described net side converter (1031), thereby provide reactive power support to described electrical network (104).
8. the high low voltage ride through device of a kind of wind turbine generator according to claim 7, it is characterized in that: described chopper circuit (101) comprises the first switching tube (T1), second switch pipe (T2), copped wave resistance (R3) and copped wave electric capacity (C3), described the first switching tube (T1) is connected with second switch pipe (T2), described copped wave electric capacity (C3) is connected in parallel on the two ends of described the first switching tube (T1) and second switch pipe (T2) series circuit, and described copped wave resistance (R3) is connected in parallel on the two ends of described the first switching tube (T1); When the fault that comprises electrical network (104) voltage swells causes the rotor current of the DC bus-bar voltage of described current transformer (103) or described generator (105) to rise to certain threshold values, second switch pipe (T2) conducting of described chopper circuit (101), described the first switching tube (T1) turn-offs, the branch road formed by described second switch pipe (T2) and described copped wave resistance (R3) discharges the energy on described DC bus, thereby reduce the voltage on described DC bus, make wind turbine generator realize high voltage crossing.
9. the high low voltage ride through device of a kind of wind turbine generator according to claim 8, it is characterized in that: described control unit (102) is integrated in the control device of described current transformer (103), and described chopper circuit (101) is integrated in same resistance box with described energy consumption resistor (600).
10. according to the high low voltage ride through device of the described a kind of wind turbine generator of arbitrary claim in claim 1,2,3,4,6,8,9, it is characterized in that: described high low voltage ride through device is applied to the high low voltage crossing of double-feedback aerogenerator group.
11. the high low voltage ride through system of wind turbine generator, it is characterized in that, comprising: as the high low voltage ride through device of the described wind turbine generator of arbitrary claim, current transformer (103), electrical network (104) and generator (105) in claim 1-10; The stator of described generator (105) is connected with described electrical network (104), the rotor of described generator (105) is connected with the pusher side of described current transformer (103), the net side of described current transformer (103) is connected with described electrical network (104), and the input three-phase that the high-low pressure of the high low voltage ride through device of described wind turbine generator passes through circuit (100) is connected with the rotor of described generator (105) with the pusher side of described current transformer (103) respectively; Described chopper circuit (101) and described control unit (102) are connected on the DC bus of described current transformer (103), and described control unit (102) also passes through circuit (100) with described high-low pressure respectively and is connected with described chopper circuit (101).
12. the high low-voltage ride-through method of wind turbine generator, it is characterized in that, high low voltage ride through device comprises that high-low pressure passes through circuit (100), chopper circuit (101) and control unit (102), described high-low pressure passes through circuit (100) and further comprises full-control type power electronic switch device circuit (400) and energy consumption resistor (600), described full-control type power electronic switch device circuit (400) further comprises copped wave pipe (401) and continued flow tube (402), and described high low-voltage ride-through method comprises the following steps:
Low voltage crossing process: when comprising that fault that electrical network (104) voltage falls suddenly causes the rotor current of the DC bus-bar voltage of described current transformer (103) or described generator (105) to rise to certain threshold values, copped wave pipe (401) conducting of described full-control type power electronic switch device circuit (400), the continued flow tube (402) of described full-control type power electronic switch device circuit (400) turn-offs, thereby make the rotor of described generator (105) and described current transformer (103) produce bypass, energy is consumed in to described energy consumption resistor (600), make wind turbine generator realize low voltage crossing,
Low-voltage crossing recovery process: when the rotor current of the DC bus-bar voltage of described current transformer (103) or described generator (105) returns to certain threshold values, the copped wave pipe (401) of described full-control type power electronic switch device circuit (400) turn-offs, continued flow tube (402) conducting of described full-control type power electronic switch device circuit (400), described energy consumption resistor (600) is carried out to afterflow, thereby can start the pusher side current transformer (1032) of described current transformer (103);
High voltage crossing process: when the fault that comprises electrical network (104) voltage swells causes the rotor current of the DC bus-bar voltage of described current transformer (103) or described generator (105) to rise to certain threshold values, described control unit (102) is controlled described chopper circuit (101) conducting, discharge the energy on described DC bus, thereby reduce the voltage on described DC bus, make wind turbine generator realize high voltage crossing.
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| CN105226635A (en) * | 2014-06-16 | 2016-01-06 | 南车株洲电力机车研究所有限公司 | Double-feedback type wind generator analogue system |
| CN105471389A (en) * | 2015-11-09 | 2016-04-06 | 中国电力科学研究院 | Fault crossing detection system and method of photovoltaic power station/photovoltaic inverter |
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| CN110326181A (en) * | 2017-02-24 | 2019-10-11 | 西门子股份公司 | Equipment for limiting the voltage of DC voltage network |
| CN113410998A (en) * | 2021-07-22 | 2021-09-17 | 上海电气风电集团股份有限公司 | Converter and wind generating set with same |
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Application publication date: 20131211 |