CN107222093A - Current transformer and the power system for wind-power electricity generation - Google Patents
Current transformer and the power system for wind-power electricity generation Download PDFInfo
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- CN107222093A CN107222093A CN201710433135.0A CN201710433135A CN107222093A CN 107222093 A CN107222093 A CN 107222093A CN 201710433135 A CN201710433135 A CN 201710433135A CN 107222093 A CN107222093 A CN 107222093A
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- igbt
- bridge arm
- modules
- current transformer
- series circuit
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- 230000005611 electricity Effects 0.000 title claims abstract description 13
- 230000008859 change Effects 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 230000002459 sustained effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910001120 nichrome Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
A kind of power system the embodiment of the invention discloses current transformer and for wind-power electricity generation.The current transformer includes：Brake module including DC/AC modules and with DC/AC wired in parallel；Brake module includes at least one bridge arm and at least one series circuit；Wherein, each IGBT reverse parallel connections that bridge arm is included in the IGBT of two series connection, bridge arm have fly-wheel diode；Series circuit includes the braking resistor and braking inductance of series connection, and series circuit is connected in the middle of two IGBT, and forms loop with the IGBT in bridge arm.The embodiment of the present invention can reduce converter cabinet volume.
Description
Technical field
The present invention relates to technical field of power systems, more particularly to a kind of current transformer and the power train for wind-power electricity generation
System.
Background technology
Wind electric converter is a kind of energy for producing wind power plant by being transferred to electricity after rectification and inversion processing
The equipment of net.But, in unusual service conditions such as low voltage crossings, the energy that wind electric converter can not produce wind power plant
It is transferred in power network, now in order to avoid the energy that can not be transferred in power network causes in wind electric converter DC voltage rise
Damage in device, wind electric converter and brake circuit is set, the energy for being not transferred to power network is consumed by brake circuit.
In modular parallel wind electric converter technology, wind electric converter uses multiple back-to-back direct current (DC)/exchanges
(AC) three phase full bridge power cell is by output reactance device form in parallel, and to improve the capacitance of output, brake circuit passes through
Extra one or more three phase full bridge power unit modules are connected in parallel on DC/AC loops two ends and realize that consumption is not transferred to power network
Energy.
But, in modular parallel wind electric converter, brake circuit is set up using extra power model, module is being installed
, it is necessary to individually set up brake unit cabinet to place brake circuit when changing wind electric converter in parallel, converter cabinet body is increased
Product.
The content of the invention
A kind of power system the embodiments of the invention provide current transformer and for wind-power electricity generation, can pass through braking resistor
Carry out consumed energy, it is simple in construction, small volume is taken, the volume of converter cabinet is saved.
In a first aspect, the embodiments of the invention provide a kind of current transformer, including DC/AC modules and with DC/AC wired in parallel
Brake module；
Brake module includes at least one bridge arm and at least one series circuit；
Wherein, bridge arm includes insulated gate bipolar transistor (the Insulated Gate Bipolar of two series connection
Transistor, IGBT), each IGBT reverse parallel connections in bridge arm have fly-wheel diode；Series circuit includes the braking of series connection
Resistance and braking inductance, series circuit are connected to two IGBT centre, and form loop with the IGBT in bridge arm.
It is according to embodiments of the present invention in a first aspect, brake module includes a bridge arm, one end of series circuit is connected to
Two IGBT of bridge arm centre, the other end of series circuit is connected with the negative pole of DC/AC modules.
It is according to embodiments of the present invention in a first aspect, brake module includes two or more bridge arm, the two ends of series circuit connect
It is connected in the middle of two IGBT of any two bridge arm.
It is according to embodiments of the present invention in a first aspect, brake module includes more than three bridge arms and corresponding with each bridge arm
Series circuit；
Wherein, one end of each series circuit be connected to correspondence bridge arm two IGBT in the middle of, each series circuit it is another
One end is connected with each other.
It is according to embodiments of the present invention in a first aspect, bridge arm includes the first IGBT and the 2nd IGBT, the first IGBT transmitting
Pole and the 2nd IGBT colelctor electrode connection, the first IGBT colelctor electrode and the positive pole connection of DC/AC modules, the first IGBT transmitting
The negative pole connection of pole and DC/AC modules.
It is according to embodiments of the present invention in a first aspect, the DC/AC modules include rectification circuit and inverter circuit；
The bridge arm is in parallel with the rectification circuit or the inverter circuit.
It is according to embodiments of the present invention in a first aspect, current transformer include two or more DC/AC modules and with two or more DC/
The corresponding brake module of each DC/AC modules in AC modules, two or more DC/AC is parallel with one another.
It is according to embodiments of the present invention in a first aspect, current transformer is believed with the control of preset switches frequency, 50% dutycycle
Number control bridge arm in IGBT turn-on and turn-off.
It is according to embodiments of the present invention in a first aspect, the working time of brake module be less than 1 second.
Second aspect, the embodiments of the invention provide a kind of power system for wind-power electricity generation, including such as first aspect
Described current transformer.
In a kind of power system the embodiments of the invention provide current transformer and for wind-power electricity generation, the embodiment of the present invention,
Current transformer includes direct current DC/ and exchanges AC modules and the brake module with DC/AC wired in parallel；Brake module includes bridge arm and series connection
Circuit；Wherein, each IGBT reverse parallel connections that bridge arm is included in the IGBT of two series connection, bridge arm have fly-wheel diode；Series electrical
Road includes the braking resistor and braking inductance of series connection, and the junction that series circuit is connected with two IGBT of bridge arm is connected, and with
IGBT formation loop in bridge arm.Brake module includes bridge arm and series circuit in the embodiment of the present invention, passes through IGBT in bridge arm
Loop is formed with series circuit, can be simple in construction by braking resistor come consumed energy, small volume is taken, in current transformer peace
Directly brake module can be integrated into during dress in DC/AC modules, save the volume of converter cabinet.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will make below to required in the embodiment of the present invention
Accompanying drawing is briefly described, it should be apparent that, drawings described below is only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is shown according to a kind of schematic diagram of current transformer in one embodiment of the invention；
Fig. 2 shows the schematic diagram according to the current transformer of another in one embodiment of the invention；
Fig. 3 shows the schematic diagram according to another current transformer in one embodiment of the invention；
Fig. 4 shows the schematic diagram according to the current transformer of another in one embodiment of the invention；
Fig. 5 shows the schematic diagram being fixedly connected according to brake module in one embodiment of the invention with radiator.
Wherein, 11-DC/AC modules, 12- brake modules, 121,121a, 121b, 121c, 121d, 121e- bridge arm, 122,
122a, 122b, 122c- series circuit, 21- radiators, 22,23-IGBT modules.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the application in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Fig. 1 is shown according to a kind of schematic diagram of current transformer in one embodiment of the invention.As shown in figure 1, the change
Flowing device includes DC/AC modules 11 and the brake module 12 in parallel with DC/AC modules 11；Brake module includes at least one bridge arm
121 and at least one series circuit 122.
Wherein, each IGBT reverse parallel connections that bridge arm 121 is included in the IGBT of two series connection, bridge arm 121 have the pole of afterflow two
Pipe；Series circuit 122 includes the braking resistor and braking inductance of series connection, and series circuit 122 is connected to two IGBT of bridge arm 121
Centre, and with bridge arm 121 IGBT formation loop.
Current transformer as shown in Figure 1, the energy of generating equipment conversion is inputted from A sides, defeated from B sides after DC/AC modules 11
Go out and enter power network, brake module 12 is in parallel with DC/AC modules 11.Brake module 12 includes bridge arm 121 and series circuit 122.Bridge
Arm 121 includes the IGBT (VT1 and VT2) of two series connection, and each IGBT one fly-wheel diode of reverse parallel connection (D1 and D2),
Bridge arm 121 is in parallel with DC/AC modules 11.Series circuit 122 includes the braking resistor R1 and braking inductance L1 of series connection, series circuit
122 are connected with the middle of VT1 and VT2 in bridge arm 121, and form loop with the IGBT in bridge arm 121.
Specifically, the junction that VT1 and VT2 centre can connect for VT1 and VT2 in bridge arm 121.
In the embodiment of the present invention, current transformer includes DC/AC modules 11 and the brake module 12 in parallel with DC/AC modules 11；
Brake module 12 includes bridge arm 121 and series circuit 122；Wherein, bridge arm 121 is included in the IGBT of two series connection, bridge arm 121
Each IGBT reverse parallel connections have fly-wheel diode；Series circuit 122 includes the braking resistor and braking inductance of series connection, series circuit
122 are connected to two IGBT of bridge arm 121 centre, and form loop with the IGBT in bridge arm 121.Made in the embodiment of the present invention
Dynamic model block 12 includes bridge arm 121 and series circuit 122, can be with by IGBT in bridge arm 121 and the formation of series circuit 122 loop
The energy of power network can not be transferred to consume by braking resistor and braking inductance in current transformer, it is simple in construction, small volume is taken,
Directly brake module 12 can be integrated into when current transformer is installed in DC/AC modules 11, save the volume of converter cabinet.
It should be noted that in embodiments of the present invention, the base stage for the IGBT that each bridge arm 121 includes is equal in brake module 12
It is connected with the control module of current transformer, control module can output control signals to each IGBT base stage, so as to realize to each
IGBT turn-on and turn-off are controlled.Control module makes two that each bridge arm 121 includes in output control signal, generally
Only one of which is in the conduction state in IGBT, for example, as shown in figure 1, when VT1 is turned on, VT2 is off state, when VT2 is led
VT1 is off state when logical.In control module control bridge arm 121 during two IGBT alternate conductions, series circuit
The voltage at 122 two ends can also change therewith, and then can also change by the electric current of series circuit 122.
Specifically, the embodiment of the present invention is illustrated with the structure of brake module 12 shown in Fig. 1.As shown in figure 1, series electrical
The one end on road 122 is connected with the middle VT1 and VT2 of bridge arm 121 junction connected, the other end and the DC/AC moulds of series circuit 122
The negative pole connection of block 11, it is assumed that in VT1 conductings, VT2 shut-offs, the voltage at the two ends of series circuit 122 is Udc, then is led in VT2
When logical, VT1 is turned off, the voltage at the two ends of series circuit 122 is-Udc, now, braking inductance can be calculated according to Ohm's law
The voltage Ul at L1 two ends is as shown in Equation 1, further according to the relation flowed through between the electric current of inductance and inductance both end voltage
The peak I p of stalling current can be calculated for shown in formula 2.
In formula 1 and formula 2, f represents the frequency of VT1 conductings, and R represents braking resistor R1 resistance, and L represents braking electricity
Feel L1 impedance.
In the prior art, in order to limit the electric current by braking resistor, need selection resistance larger according to Ohm's law
Braking resistor, while braking resistor needs to consume the energy of abnormality generating equipment generation, this causes braking power electricity
The difficult design of resistance, while the larger price of the volume of braking resistor is higher；In addition, braking resistor at work can persistent fever,
The temperature of braking resistor can be with heating rapid increase, and resistance can increase with the lifting of temperature, cause actual system
Streaming current persistently reduces in braking procedure, and braking power is not enough so that DC bus-bar voltage is quickly improved in current transformer,
Security risk is brought to current transformer.
And from above-mentioned formula 1 and formula 2, the induction reactance of inductance is braked by improving and brake switch frequency is improved
(IGBT turn-on frequency in bridge arm 121), can be achieved the purpose for the electric current that limitation passes through braking resistor, now can then reduce
The resistance of braking resistor.When the resistance of braking resistor is far below the impedance for braking inductance, the resistance of braking resistor is with temperature
The influence for improving the conversion risen the blocked impedance change total to brake module is very small, and stalling current does not also become substantially
Change, so the now change of braking resistor resistance is difficult so that DC bus-bar voltage is quickly improved in current transformer, and then is reduced
The security risk of current transformer.
It is to sum up shown, in embodiments of the present invention, when making braking resistor resistance far below braking inductive impedance by setting,
The security risk of current transformer can be reduced.
In the embodiment of the present invention, the material of braking resistor includes iron or nichrome.Due to iron or nichrome material
Thermal diffusivity is good, so can reduce the volume and cost of braking resistor as the material of braking resistor with it.
As a kind of optional embodiment of the embodiment of the present invention, current transformer can be with preset switches frequency, 50%
IGBT turn-on and turn-off in the control signal control bridge arm 121 of dutycycle.
Wherein, current transformer control bridge arm 121 in IGBT turn-on and turn-off when, can by export preset switches frequency,
The control signal of 50% dutycycle is realized.F in preset switches frequency, as formula 1 and formula 2, its value can be according to reality
Border application scenarios are configured, and 50% dutycycle represents the width ratio of control signal high level in a cycle, or one
Ratio in the individual cycle shared by high level.
It should be noted that, it is necessary to make two IGBT during two IGBTs conducting of the current transformer in the same bridge arm 121 of control
Alternate conduction, in order to which brake module being capable of normal work.
As a kind of optional embodiment of the embodiment of the present invention, in the embodiment of the present invention, the work of brake module 12
Time can be less than 1 second.
Wherein, in the embodiment of the present invention, the IGBT in bridge arm 121 can be controlled to carry out high-frequency impulse width modulated (Pulse
Width Modulation, PWM) work, so the working time of brake module 12 can be shorter, can be less than 1 second, typically not
More than 0.625 second.
As a kind of optional embodiment of the embodiment of the present invention, brake module 12 includes a bridge arm 121, series electrical
The one end on road 122 is connected in the middle of the VT1 of bridge arm 121 and VT2, the other end of series circuit 122 and the negative pole of DC/AC modules 11
Or the positive pole connection of DC/AC modules 11.
Wherein, in the embodiment of the present invention, when brake module 12 includes a bridge arm 121, bridge arm 121 and series circuit
122 connected mode is connected to the centre of VT1 and VT2 in bridge arm 121 for one end of series circuit 122, series circuit 122 it is another
The negative pole of one end connection DC/AC modules 11 or the positive pole of DC/AC modules 11, such series circuit 122 is two in bridge arm 121
Loop can be formed during IGBT alternate conductions.
Specifically, as shown in figure 1, brake module 12 includes a bridge arm 121 and a series circuit 122, bridge arm 121 is wrapped
The VTI and VT2 of series connection are included, series circuit 122 includes the braking inductance L1 and braking resistor R1 of series connection, the one of series circuit 122
Hold and be connected with VT1 in the bridge arm 121 and VT2 junctions connected, the other end of series circuit 122 and the negative pole of DC/AC modules 11
Connection.When VTI is turned on, VT2 shut-offs, series circuit 122 and VTI form loop；When VT2 is turned on, VT1 shut-offs, series electrical
Road 122 and VT2 formation loop.
Fig. 2 shows the schematic diagram according to the current transformer of another in one embodiment of the invention.As of the invention real
Another optional embodiment of example is applied, brake module 12 can include two or more bridge arm 121, the two ends of series circuit 122
It is connected in the middle of two IGBT of any two bridge arm 121.
Wherein, when brake module 12 includes two or more bridge arm 121, each bridge arm 121 includes two IGBT of series connection,
And in each one fly-wheel diode of IGBT reverse parallel connections, each bridge arm 121 that brake module 12 includes is parallel with one another, and simultaneously simultaneously
It is coupled to DC/AC modules 11.The two ends of series circuit 122 in the middle of two IGBT of different bridge arms 121 from connecting, and each
In bridge arm 121 series circuit 122 is all connected with the middle of two IGBT of two any bridge arms 121.
Specifically, the embodiment of the present invention is carried out by taking the structure that brake module 12 shown in Fig. 2 includes two bridge arms 121 as an example
Explanation.As shown in Fig. 2 brake module 12 includes two bridge arms 121 (121a and 121b), bridge arm 121a includes the IGBT of series connection
VT3 and IGBT VT4, bridge arm 121b include IGBT VT5 and IGBT VT6, IGBT the VT3 reverse parallel connection fly-wheel diodes of series connection
D3, IGBT VT4 reverse parallel connections sustained diode 4, IGBT VT5 reverse parallel connections sustained diode 5, IGBT VT6 reverse parallel connections
Sustained diode 6.Series circuit 122 includes the braking inductance L2 and braking resistor R2 of series connection, and one end of series circuit 122 connects
Connect the junction of VT3 and VT4 series connection in bridge arm 121a, the other end connection bridge arm 121b of series circuit 122 middle VT5 and VT6
The junction of series connection, i.e., the connection that two IGBT in bridge arm 121a two IGBT junctions connected and bridge arm 121b connect
Between connect series circuit 122.
Fig. 3 shows the schematic diagram according to another current transformer in one embodiment of the invention.As of the invention real
The optional embodiment of example one is applied, brake module 12 includes more than three bridge arms 121 and series connection corresponding with each bridge arm 121
Circuit 122；One end of each series circuit 122 is connected in the middle of two IGBT of correspondence bridge arm 121, each series circuit 122
The other end be connected with each other.
Wherein, in the embodiment of the present invention, when brake module 12 includes more than three bridge arms 121, each bridge arm 121 includes
Two IGBT of series connection, and in each one fly-wheel diode of IGBT reverse parallel connections, the phase of each bridge arm 121 that brake module 12 includes
It is mutually in parallel, and DC/AC modules 11 are connected in parallel to simultaneously.Brake module 12 also includes the series circuit 122 of each bridge arm 121 of correspondence,
Series circuit 122 includes the braking inductance and braking resistor of series connection, one end connection and the corresponding bridge of each series circuit 122
In the middle of two IGBT of arm 121, the other end of each series circuit 122 is connected with each other.
Specifically, the embodiment of the present invention is carried out by taking the structure that brake module 12 shown in Fig. 3 includes two bridge arms 121 as an example
Explanation.As shown in figure 3, brake module 12 includes three bridge arms (121c, 121d and 121e), bridge arm 121c includes the IGBT of series connection
IGBT VT9 and the IGBT VT10, bridge arm 121e that VT7 and IGBT VT8, bridge arm 121d include series connection include the IGBT of series connection
VT11 and IGBT VT12, sustained diode 7, D8, D9, D10, D11 and D12 are connected in reverse parallel in IGBT VT7, IGBT respectively
VT8, IGBT VT9, IGBT VT10, IGBT VT11 and IGBT VT12 two ends.With each bridge arm in Fig. 3 (121c, 121d and
121e) corresponding series circuit 122 includes series circuit 122a, series circuit 122b and series circuit 122e, wherein, bridge arm
121c is corresponding with series circuit 122a, and bridge arm 121d is corresponding with series circuit 122b, and bridge arm 121e is corresponding with series circuit 122c.
Series circuit 122a includes the braking electric capacity L3 and braking resistor R3 of series connection, and series circuit 122b includes the braking electric capacity L4 of series connection
Include the braking electric capacity L5 and braking resistor R5 of series connection with braking resistor R4, series circuit 122c.Series circuit 122a one end
It is connected with VT7 in the bridge arm 121c and VT8 junctions connected, series circuit 122b one end and VT9 and VT10 in bridge arm 121d
The junction connection of series connection, series circuit 122c one end is connected with VT11 in the bridge arm 121e and VT12 junctions connected, gone here and there
The other end for joining circuit 122a, series circuit 122b and series circuit 122c is connected with each other.
As one optional embodiment of the embodiment of the present invention, two IGBT connected in bridge arm 121 include first
The colelctor electrode connection of IGBT and the 2nd IGBT, the first IGBT emitter stage and the 2nd IGBT, the first IGBT colelctor electrode and DC/AC
The positive pole connection of module, the first IGBT emitter stage and the negative pole connection of DC/AC modules.
Wherein, two IGBT include the first IGBT and the 2nd IGBT, the first IGBT and the 2nd IGBT series connection sides in bridge arm 121
Formula is：The colelctor electrode connection of first IGBT emitter stage and the 2nd IGBT, the first IGBT and the 2nd IGBT and DC/AC modules 11 are simultaneously
The mode of connection is：First IGBT colelctor electrode and the positive pole connection of DC/AC modules 11, the first IGBT emitter stage and DC/AC moulds
The negative pole connection of block 11.
For example, as shown in figure 1, in bridge arm 121, IGBT VT1 are that the first IGBT, IGBT VT2 is the 2nd IGBT, IGBT
The colelctor electrode connection of VT1 emitter stage and IGBT VT2, IGBT VT1 colelctor electrode and the positive pole connection of DC/AC modules 11,
IGBT VT2 emitter stage and the negative pole connection of DC/AC modules 11.
As one optional embodiment of the embodiment of the present invention, DC/AC modules 11 include rectification circuit and inverter circuit；
Bridge arm 121 is in parallel with rectification circuit or inverter circuit.
Wherein, DC/AC modules 11 include rectification circuit and inverter circuit, bridge arm 121 when in parallel with DC/AC modules 11,
Both can be in parallel with rectification circuit, can also be in parallel with inverter circuit.For example, as shown in Figure 1, Figure 2 with shown in Fig. 3, for braking mould
Block 12 is connected in parallel on the structure at inverter circuit two ends.
Fig. 4 shows the schematic diagram according to the current transformer of another in one embodiment of the invention.As of the invention real
Apply the optional embodiment of example one, current transformer include two or more DC/AC modules 11 and with two or more DC/AC modules 11
The corresponding brake module 12 of each DC/AC modules 11, two or more DC/AC modules 11 are parallel with one another.
Wherein, current transformer includes two or more DC/AC modules 11 parallel with one another, and each DC/AC modules 11 correspond to one
Individual brake module 12, each DC/AC modules 11 and corresponding brake module 12 are in parallel.
Specifically, the embodiment of the present invention is illustrated by taking converter structure shown in Fig. 4 as an example.As shown in figure 4, current transformer bag
Include two DC/AC modules 11 parallel with one another, each DC/AC modules 11 correspond to a brake module 12, brake module 12 with
Corresponding DC/AC modules 11 are in parallel.
It should be noted that each power model and radiator are passed through thermal conductivity material by modular parallel current transformer in application
Material is fixed together.In the embodiment of the present invention, brake module 12 is simple in construction, can directly with it is whole in DC/AC modules 11
Current circuit and inverter circuit are together fixedly connected with radiator 21.For example, to the converter structure shown in Fig. 4, brake module 12
Be connected in parallel on inverter circuit two ends, inverter circuit and brake module 12 constitute three-phase four-arm power model, brake module 12 with it is inverse
Become circuit to be together fixedly connected with radiator 21 as power model.Fig. 5 is what brake module 12 was fixedly connected with radiator 21
Schematic diagram, as shown in figure 5, radiator 21 secures four IGBT modules, wherein, IGBT module 22 is each in inverter circuit
IGBT bridge arms 121, IGBT module 23 is the bridge arm 121 of brake module 12.The embodiment of the present invention, is fixed in original inverter circuit
Radiator 21 on, adds additional an IGBT module 23 as brake module 12, the top of IGBT module 23 is direct current input
Terminal, in parallel with the DC terminal of IGBT module 23, the output copper bar of the bottom of IGBT module 23 is connected to braking resistor and braking electricity
The other end of sense, braking resistor and braking inductance is connected on negative pole, and the output copper bar of IGBT module 22 is three-phase alternating current
Output.
In modular parallel current transformer normal work, IGBT does not work in IGBT module 23, radiator 21 only need with it is cold
But the heat that the three-phase inversion IGBT of Medium Exchange IGBT module 22 is produced.When needing brake module 12 to work, IGBT module
23 IGBT carries out high-frequency PWM, and because the working time of brake module 12 is shorter, the moment caloric value of generation is by radiator 21
Thermal capacitance absorb, the normal work of three phase inverter bridge is not influenceed, the utilization rate of radiator is substantially increased.
As another optional embodiment of the embodiment of the present invention, current transformer described in the embodiment of the present invention can be with
Including wind electric converter.
Further embodiment of this invention additionally provides a kind of power system for wind-power electricity generation, including as in above-mentioned embodiment
Described current transformer.
Wherein, power system usually requires current transformer the electric energy that other energy are changed is transferred in power network, for example, in wind
Power generating equipment is converted to wind energy after electric energy, is transmitted the electric energy of conversion into power network by current transformer, now power system
In current transformer can include above-described embodiment described in current transformer structure.
Those of ordinary skill in the art are it is to be appreciated that the list of each example described with reference to the embodiments described herein
Member and algorithm steps, can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate hardware
With the interchangeability of software, the composition and step of each example are generally described according to function in the above description.This
A little functions are performed with hardware or software mode actually, depending on the application-specific and design constraint of technical scheme.Specially
Industry technical staff can realize described function to each specific application using distinct methods, but this realization is not
It is considered as beyond the scope of this invention.
It is apparent to those skilled in the art that, for convenience of description and succinctly, foregoing description is
The specific work process of system, device and unit, may be referred to the corresponding process in preceding method embodiment, will not be repeated here.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, various equivalent modifications can be readily occurred in or replaced
Change, these modifications or substitutions should be all included within the scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection domain be defined.
Claims (10)
1. a kind of current transformer, it is characterised in that including direct current DC/ exchange AC modules (11) and with the DC/AC modules (11) simultaneously
The brake module (12) of connection；
The brake module (12) includes at least one bridge arm (121) and at least one series circuit (122)；
Wherein, the bridge arm (121) is included in the insulated gate bipolar transistor IGBT of two series connection, the bridge arm (121)
Each IGBT reverse parallel connections have fly-wheel diode；The series circuit (122) includes the braking resistor and braking inductance of series connection, institute
The centre that series circuit (122) is connected to described two IGBT is stated, and loop is formed with the IGBT in the bridge arm (121).
2. current transformer according to claim 1, it is characterised in that the brake module (12) includes a bridge arm
(121), one end of the series circuit (122) is connected to two IGBT of the bridge arm (121) centre, the series circuit
(122) the other end is connected with the negative pole of the DC/AC modules (11) or the positive pole of the DC/AC modules (11).
3. current transformer according to claim 1, it is characterised in that the brake module (12) includes bridge arm described in two or more
(121), the two ends of the series circuit (122) are connected in the middle of two IGBT of bridge arm described in any two (121).
4. current transformer according to claim 1, it is characterised in that the brake module (12) includes three bridge arms described above
And the series circuit (122) corresponding with each bridge arm (121) (121)；
Wherein, one end of each series circuit (122) is connected in the middle of two IGBT of the correspondence bridge arm (121), often
The other end of the individual series circuit (121) is connected with each other.
5. current transformer according to claim 1, it is characterised in that two IGBT of series connection include the in the bridge arm (121)
The colelctor electrode connection of one IGBT and the 2nd IGBT, the first IGBT emitter stage and the 2nd IGBT, the first IGBT
Colelctor electrode and the DC/AC modules (11) positive pole connection, the emitter stage and the DC/AC modules (11) of the first IGBT
Negative pole connection.
6. current transformer according to claim 1, it is characterised in that the DC/AC modules (11) include rectification circuit and inversion
Circuit；
The bridge arm (121) is in parallel with the rectification circuit or the inverter circuit.
7. current transformer according to claim 1, it is characterised in that the current transformer includes DC/AC modules described in two or more
And the brake module corresponding with each DC/AC modules (11) in DC/AC modules (11) described in two or more (11)
(12), described two DC/AC modules (11) described above are parallel with one another.
8. current transformer according to claim 1, it is characterised in that the current transformer is with preset switches frequency, 50% duty
IGBT's turns on and off in the control signal control bridge arm (121) of ratio.
9. current transformer according to claim 1, it is characterised in that the working time of the brake module (12) is less than 1 second.
10. a kind of power system for wind-power electricity generation, it is characterised in that including the change as described in claim any one of 1-9
Flow device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710433135.0A CN107222093A (en) | 2017-06-09 | 2017-06-09 | Current transformer and the power system for wind-power electricity generation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710433135.0A CN107222093A (en) | 2017-06-09 | 2017-06-09 | Current transformer and the power system for wind-power electricity generation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107222093A true CN107222093A (en) | 2017-09-29 |
Family
ID=59948656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710433135.0A Pending CN107222093A (en) | 2017-06-09 | 2017-06-09 | Current transformer and the power system for wind-power electricity generation |
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| Country | Link |
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| CN (1) | CN107222093A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109449995A (en) * | 2018-12-29 | 2019-03-08 | 北京天诚同创电气有限公司 | Control the method and system of the brake circuit of wind electric converter |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103312189A (en) * | 2013-06-08 | 2013-09-18 | 北京天诚同创电气有限公司 | Three-level converter for direct-drive wind power generator set |
| CN103414205A (en) * | 2013-07-12 | 2013-11-27 | 国家电网公司 | Wind farm super capacitor energy storage type unified power quality conditioner |
| US20130334818A1 (en) * | 2012-06-19 | 2013-12-19 | Clipper Windpower, LLC. | Dynamic Braking on a Wind Turbine During a Fault |
| CN104362672A (en) * | 2014-10-27 | 2015-02-18 | 国家电网公司 | Wind power generation system |
| CN204578108U (en) * | 2015-03-06 | 2015-08-19 | 株洲南车时代电气股份有限公司 | A kind of converter device and system |
| CN105140963A (en) * | 2015-09-21 | 2015-12-09 | 哈尔滨理工大学 | Doubly-fed wind generator system based on fault current-limiting control and low voltage ride through method |
| CN106549584A (en) * | 2016-12-26 | 2017-03-29 | 北京金风科创风电设备有限公司 | Power module of wind power converter |
| CN106602848A (en) * | 2016-12-30 | 2017-04-26 | 北京金风科创风电设备有限公司 | Parallel power module driving control method and device and converter |
-
2017
- 2017-06-09 CN CN201710433135.0A patent/CN107222093A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130334818A1 (en) * | 2012-06-19 | 2013-12-19 | Clipper Windpower, LLC. | Dynamic Braking on a Wind Turbine During a Fault |
| CN103312189A (en) * | 2013-06-08 | 2013-09-18 | 北京天诚同创电气有限公司 | Three-level converter for direct-drive wind power generator set |
| CN103414205A (en) * | 2013-07-12 | 2013-11-27 | 国家电网公司 | Wind farm super capacitor energy storage type unified power quality conditioner |
| CN104362672A (en) * | 2014-10-27 | 2015-02-18 | 国家电网公司 | Wind power generation system |
| CN204578108U (en) * | 2015-03-06 | 2015-08-19 | 株洲南车时代电气股份有限公司 | A kind of converter device and system |
| CN105140963A (en) * | 2015-09-21 | 2015-12-09 | 哈尔滨理工大学 | Doubly-fed wind generator system based on fault current-limiting control and low voltage ride through method |
| CN106549584A (en) * | 2016-12-26 | 2017-03-29 | 北京金风科创风电设备有限公司 | Power module of wind power converter |
| CN106602848A (en) * | 2016-12-30 | 2017-04-26 | 北京金风科创风电设备有限公司 | Parallel power module driving control method and device and converter |
Non-Patent Citations (1)
| Title |
|---|
| 高海涛，等: "《风电场运行与维护》", 31 July 2014, 中国商业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109449995A (en) * | 2018-12-29 | 2019-03-08 | 北京天诚同创电气有限公司 | Control the method and system of the brake circuit of wind electric converter |
| CN109449995B (en) * | 2018-12-29 | 2023-07-21 | 北京天诚同创电气有限公司 | Method and system for controlling braking loop of wind power converter |
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