CN109449992A - Converter side common mode voltage suppression device and method, converter and fan - Google Patents
Converter side common mode voltage suppression device and method, converter and fan Download PDFInfo
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- CN109449992A CN109449992A CN201811590200.1A CN201811590200A CN109449992A CN 109449992 A CN109449992 A CN 109449992A CN 201811590200 A CN201811590200 A CN 201811590200A CN 109449992 A CN109449992 A CN 109449992A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000001629 suppression Effects 0.000 title abstract description 3
- 239000003990 capacitor Substances 0.000 claims abstract description 26
- 238000002955 isolation Methods 0.000 claims abstract description 8
- 230000005611 electricity Effects 0.000 claims description 9
- 230000006641 stabilisation Effects 0.000 claims description 6
- 238000011105 stabilization Methods 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims 2
- 238000010248 power generation Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000005764 inhibitory process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
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- H02J3/386—
-
- 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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- 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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
-
- 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
The invention provides a converter side common mode voltage suppression device and method, a converter and a fan. The device comprises: the controllable inversion system comprises a rectification module, a direct-current bus, a direct-current support capacitor, a controllable inversion module and an isolation transformer, wherein the rectification module, the direct-current support capacitor, the controllable inversion module and the isolation transformer are sequentially arranged between the output end of the power generation equipment and a power grid; the input end of the rectifying module is used for being connected with the output end of the power generation equipment, and the output end of the rectifying module is connected to the direct current bus; the positive electrode and the negative electrode of the direct current support capacitor are respectively connected to a direct current positive bus and a direct current negative bus of the direct current bus; the direct current bus is connected to the primary side of the isolation transformer through the controllable inversion module, and the secondary side of the isolation transformer is connected to the power grid. According to the device and the method, the converter and the wind generating set, the common-mode voltage of the machine side can be well restrained, and meanwhile, the alternating current can be additionally fed into a power grid.
Description
Technical field
All things considered of the present invention is related to electron electric power technical field, more particularly, is related to a kind of current transformer pusher side common mode
Voltage suppression device and method, current transformer and blower (that is, wind power generating set).
Background technique
Currently, main using the RLC common-mode voltage filter circuit being made of resistance R, inductance L and capacitor C as shown in Figure 1
It is filtered come the pusher side common-mode voltage to current transformer, to reduce the amplitude of pusher side common-mode voltage.However, this inhibition pusher side is total
The mode of mode voltage for the length of cable between current transformer pusher side parameter, generating equipment parameter, current transformer and generating equipment all
Compare sensitive, needs that different RLC parameters is arranged for different generating equipments, and for the spike of high frequency pusher side common-mode voltage
It can not completely inhibit, in addition, finally being converted the energy of pusher side common-mode voltage by way of this inhibition pusher side common-mode voltage
It is distributed for heat, causes the calorific value of RLC common-mode voltage filter circuit larger.
Summary of the invention
Exemplary embodiment of the present invention is to provide a kind of inhibition of current transformer pusher side common-mode voltage device and method, unsteady flow
Device and wind power generating set inhibit pusher side common-mode voltage to rely on the type selecting of each device parameters, promote current transformer machine to reduce
The applicability of side common-mode voltage Restrain measurement.
An exemplary embodiment of the present invention provides a kind of current transformer pusher side common-mode voltage inhibition device, described device
It include: rectification module, DC bus, DC support capacitor, controllable inverter module and isolating transformer, wherein rectification module,
DC support capacitor, controllable inverter module, isolating transformer are arranged in order between the output end of generating equipment and power grid；
Wherein, the input terminal of rectification module is used to connect the output end of the generating equipment, and the output end of the rectification module is connected to
DC bus；The anode and cathode of DC support capacitor are connected respectively to direct current positive bus and the negative mother of direct current of the DC bus
Line；DC bus is connected to the primary side of isolating transformer via controllable inverter module, and the secondary side of isolating transformer is connected to power grid.
Optionally, described device further include: pre-charge module, wherein the secondary side of isolating transformer is via pre-charge module
It is connected to power grid, pre-charge module obtains voltage from power grid and is pre-charged to DC bus.
Optionally, the rectification module is uncontrollable rectifier bridge, and the uncontrollable rectifier bridge includes: first diode, the two or two
Pole pipe, third diode and the 4th diode, wherein first diode and the second diode are serially connected in direct current positive bus and straight
It flows between negative busbar；Third diode and the 4th diode are serially connected between direct current positive bus and direct current negative busbar；One or two pole
The cathode of pipe and the cathode of third diode are connected to direct current positive bus, the anode of the anode of the second diode and the 4th diode
It is connected to direct current negative busbar；The anode of first diode connects the output end of the generating equipment, and the anode of third diode connects
Ground.
Optionally, the controllable inverter module includes: the first insulated gate bipolar transistor, the second insulated gate bipolar crystalline substance
Body pipe, third insulated gate bipolar transistor, the 4th insulated gate bipolar transistor, the first freewheeling diode, the second afterflow two
Pole pipe, third freewheeling diode and the 4th freewheeling diode, wherein the collector of the first insulated gate bipolar transistor and
The collector of three insulated gate bipolar transistors is connected to direct current positive bus, the emitter of the second insulated gate bipolar transistor and
The emitter of 4th insulated gate bipolar transistor is connected to direct current negative busbar, the emitter of the first insulated gate bipolar transistor
One end of the primary side of isolating transformer, third insulated gate bipolar are connected to the collector of the second insulated gate bipolar transistor
The collector of the emitter of transistor and the 4th insulated gate bipolar transistor is connected to the other end of the primary side of isolating transformer,
Wherein, the first insulated gate bipolar transistor and the first freewheeling diode reverse parallel connection, the second insulated gate bipolar transistor with
Second freewheeling diode reverse parallel connection, third insulated gate bipolar transistor and third freewheeling diode reverse parallel connection, the 4th are absolutely
Edge grid bipolar junction transistor and the 4th freewheeling diode reverse parallel connection.
Optionally, the pre-charge module includes: pre-charge contactor, pre-charge resistance and main contactor, wherein isolation
The one end on the secondary side of transformer is connected to one end of pre-charge contactor and one end of main contactor, the other end connection of main contact
The other end to power grid, pre-charge contactor is connected to power grid via pre-charge resistance.
In accordance with an alternative illustrative embodiment of the present invention, a kind of current transformer is provided, the current transformer includes as described above
Current transformer pusher side common-mode voltage inhibits device.
In accordance with an alternative illustrative embodiment of the present invention, a kind of wind power generating set, the wind power generating set packet are provided
Current transformer as described above is included, the generating equipment is the generator of the wind power generating set, and the three-phase of the generator is defeated
Outlet is connected to the input terminal of the current transformer.
In accordance with an alternative illustrative embodiment of the present invention, a kind of current transformer pusher side common-mode voltage suppressing method is provided, it is described
Method is applied to current transformer pusher side common-mode voltage as described above and inhibits device, which comprises generates when current transformer is run
When pusher side common-mode voltage, the pusher side common-mode voltage of generation is rectified by DC voltage by rectification module, and will be straight after rectification
Galvanic electricity pressure is output to DC bus, and is boosted by voltage of the DC support capacitor to DC bus；Pass through controllable inversion
The voltage inversion of DC bus is single-phase AC voltage by module；Controllable inverter module exported by isolating transformer single-phase
Alternating voltage is transformed to have access to the alternating voltage of power grid and transformed alternating voltage is linked into power grid.
Optionally, the method also includes: before the current transformer brings into operation, obtained by pre-charge module from power grid
Take voltage, to be pre-charged to DC bus, until the voltage of DC bus reaches preset value, stop to DC bus into
Line precharge.
Optionally, reach the preset value in the voltage of the DC bus, what stopping was pre-charged DC bus
After step, the secondary side of isolating transformer is directly connected to power grid, and controllable inverter module carries out pulse width modulation, will be described straight
Flow the voltage stabilization of bus within a preset range.
Current transformer pusher side common-mode voltage according to an exemplary embodiment of the present invention inhibits device and method, by total to pusher side
Mode voltage absorbed, stored, inversion, and is eventually converted into and is had access to the alternating current of power grid and be fed to power grid, Neng Gou
While inhibiting pusher side common-mode voltage well, the generated energy for increasing generating equipment, reduces the generating efficiency for improving generating equipment
Calorific value；Also, not to the length of cable between current transformer pusher side parameter, generating equipment parameter, current transformer and generating equipment
Sensitivity promotes being applicable in for current transformer pusher side common-mode voltage Restrain measurement so as to be perfectly suitable for different service conditions
Property.
Part in following description is illustrated into the other aspect and/or advantage of present general inventive concept, there are also one
Dividing will be apparent by description, or can learn by the implementation of present general inventive concept.
Detailed description of the invention
By below with reference to be exemplarily illustrated embodiment attached drawing carry out description, exemplary embodiment of the present it is upper
Stating will become apparent with other purposes and feature, in which:
Fig. 1 shows the example of the existing RLC common-mode voltage filter circuit for being filtered to pusher side common-mode voltage；
Fig. 2 shows the schematic diagrames that current transformer pusher side common-mode voltage according to an exemplary embodiment of the present invention inhibits device；
Fig. 3 shows the signal that current transformer pusher side common-mode voltage in accordance with an alternative illustrative embodiment of the present invention inhibits device
Figure；
Fig. 4 shows the circuit diagram that current transformer pusher side common-mode voltage according to an exemplary embodiment of the present invention inhibits device；
Fig. 5 shows the flow chart of current transformer pusher side common-mode voltage suppressing method according to an exemplary embodiment of the present invention；
Fig. 6 shows the process of current transformer pusher side common-mode voltage suppressing method in accordance with an alternative illustrative embodiment of the present invention
Figure.
Specific embodiment
It reference will now be made in detail the embodiment of the present invention, examples of the embodiments are shown in the accompanying drawings, wherein identical mark
Number identical component is referred to always.It will illustrate the embodiment, by referring to accompanying drawing below to explain the present invention.
Fig. 2 shows the schematic diagrames that current transformer pusher side common-mode voltage according to an exemplary embodiment of the present invention inhibits device.
As shown in Fig. 2, it includes: rectification that current transformer pusher side common-mode voltage according to an exemplary embodiment of the present invention, which inhibits device,
Module 10, DC bus 20, DC support capacitor 30, controllable inverter module 40 and isolating transformer 50.Rectification module 10,
DC support capacitor 30, controllable inverter module 40, isolating transformer 50 are arranged in order at the output end and electricity of generating equipment
Between net.
The input terminal of rectification module 10 is used to connect the output end of the generating equipment, the output end connection of rectification module 10
To DC bus 20；The anode and cathode of DC support capacitor 30 are connected respectively to the direct current positive bus and direct current of DC bus 20
Negative busbar；DC bus 20 is connected to the primary side of isolating transformer 50, the pair of isolating transformer 50 via controllable inverter module 40
While being connected to power grid.The pusher side common-mode voltage that rectification module 10 generates when running current transformer is rectified into DC voltage, and will be whole
The single-phase AC voltage that direct voltage output after stream exports controllable inverter module 40 to DC bus 20, isolating transformer 50
It is converted, transformed alternating voltage is linked into power grid, and common-mode voltage and power grid are isolated.
As an example, the generating equipment can be the generator of wind power generating set.It should be understood that the generating equipment
It is also possible to other kinds of generating equipment.
As an example, the input terminal of rectification module 10 may be connected to the three-phase output end of the generating equipment (that is, A phase is defeated
One of outlet, B phase output terminal and C phase output terminal), also, the three-phase output end is connected to the input terminal of the current transformer.
In Fig. 2, only by taking the input terminal of rectification module 10 is connected to the A phase output terminal of the generating equipment as an example, here,
It should be understood that the input terminal of rectification module 10 can be connected to the B phase output terminal or C phase output terminal of the generating equipment, it is practical
On, three current transformer pusher side common-mode voltages according to an exemplary embodiment of the present invention should be set for a generating equipment and inhibit dress
It sets, the three-phase output end of the generating equipment and these three current transformer pusher side common-mode voltages inhibit device to correspond, each mutually defeated
Outlet is connected respectively to corresponding current transformer pusher side common-mode voltage and inhibits device, inhibits current transformer and generating equipment to realize
Each corresponding pusher side common-mode voltage.In addition, the GND in Fig. 2 indicates ground connection.
Particularly, the pusher side common-mode voltage that rectification module 10 is used to generate when running current transformer is rectified into direct current
Pressure, and by the direct voltage output after rectification to DC bus 20.
As an example, rectification module 10 can be the uncontrollable rectifier bridge for including 4 diodes.
As an example, the diode can be silicon carbide diode.In view of the frequency of the pusher side common-mode voltage of current transformer
It is higher, voltage change ratio is larger, an exemplary embodiment of the present invention can, reverse recovery time higher by voltage endurance capability compared with
Short silicon carbide diode realizes the uncontrollable rectifier function of the pusher side common-mode voltage to high-frequency, big voltage change ratio, thus
The spike of high frequency pusher side common-mode voltage can be inhibited well, improve assimilation effect to pusher side common-mode voltage.
The DC voltage that DC support capacitor 30 is used to export rectification module 10 carries out energy storage, so that DC bus 20
DC voltage increases, that is, DC support capacitor 30 plays stable DC bus for boosting to the voltage of DC bus 20
The effect of 20 voltage.
As an example, the higher thin-film capacitor of pressure resistance can be used in DC support capacitor 30.
Controllable inverter module 40 is used for the voltage stabilization of DC bus 20 within a preset range, and by DC bus 20
DC voltage inversion is single-phase AC voltage, that is, the DC energy of DC bus 20 is converted to AC energy.
As an example, controllable inverter module 40 may include 4 insulated gate bipolar transistors (IGBT) or metal-oxide
Object semiconductor field effect transistor (MOSFET).
Isolating transformer 50 is for being transformed to the single-phase AC voltage that controllable inverter module 40 exports to have access to electricity
Transformed alternating voltage is simultaneously linked into power grid by the alternating voltage of net, and pusher side common-mode voltage and power grid are isolated, with
Prevent pusher side common-mode voltage from interfering to power grid.
As an example, isolating transformer 50 can convert the alternating voltage that controllable inverter module 40 exports to the exchange of 230V
Voltage is simultaneously linked into power grid, by AC energy feed-in power grid.
Current transformer pusher side common-mode voltage according to an exemplary embodiment of the present invention inhibits device, makes the energy of pusher side common-mode voltage
Amount passes through rectification module 10, DC support capacitor 30, controllable inverter module 40, isolating transformer between current transformer and the earth
50 finally flow into power grid, to increase the generated energy of wind power generating set while inhibiting pusher side common-mode voltage well.
Current transformer pusher side common-mode voltage according to an exemplary embodiment of the present invention inhibits device, with existing RLC common mode electricity
Filters pressing wave circuit is compared, small in size, light-weight, calorific value is small, and has good absorption for the energy of pusher side common-mode voltage
Ability can additionally increase the generated energy of generating equipment.Current transformer pusher side common-mode voltage according to an exemplary embodiment of the present invention
Device is inhibited to may be used on the exceeded generating equipment of the pusher side common-mode voltage run as RLC common-mode voltage filter circuit
Supplement can also be applied in the design of new generating equipment.
Fig. 3 shows the frame that current transformer pusher side common-mode voltage in accordance with an alternative illustrative embodiment of the present invention inhibits device
Figure.
As shown in figure 3, it includes: rectification that current transformer pusher side common-mode voltage according to an exemplary embodiment of the present invention, which inhibits device,
Module 10, DC bus 20, DC support capacitor 30, controllable inverter module 40, isolating transformer 50 and pre-charge module
60。
Rectification module 10, DC bus 20, DC support capacitor 30, controllable inverter module 40 and isolating transformer 50 it
Between connection type, specific implementation can refer to the specific embodiment of above-mentioned combination Fig. 2 description to realize, it is no longer superfluous herein
It states.
The secondary side of isolating transformer 50 is connected to power grid via pre-charge module 60, and pre-charge module 60 obtains electricity from power grid
Pressure is pre-charged DC bus 20.
As an example, pre-charge module 60 before current transformer pusher side is also inactive to DC bus 20 for slowly filling
Electricity, to establish the voltage of DC bus 20, so that the starting of current transformer pusher side be avoided to cause to impact for DC support capacitor 30.
Fig. 4 shows the circuit diagram that current transformer pusher side common-mode voltage according to an exemplary embodiment of the present invention inhibits device.
As shown in figure 4, as an example, rectification module 10 can include: first diode 101, the second diode 103, third
Diode 103 and the 4th diode 104, wherein first diode 101 and the second diode 102 are serially connected in DC bus 20
Direct current positive bus 201 and direct current negative busbar 202 between；Third diode 103 and the 4th diode 104 are serially connected in direct current positive pole
Between line 201 and direct current negative busbar 202；The cathode (that is, the pole K) of first diode 101 and the cathode of third diode 103 connect
It is connected to direct current positive bus, it is negative that the anode (that is, the pole A) of the second diode 102 and the anode of the 4th diode 104 are connected to direct current
Bus；The anode of first diode 101 connects the output end of the generating equipment, the plus earth of third diode 103.
As an example, controllable inverter module 40 can include: the first insulated gate bipolar transistor 401, the second insulated gate are double
Bipolar transistor 402, third insulated gate bipolar transistor 403, the 4th insulated gate bipolar transistor 404, the first afterflow two
Pole pipe 405, the second freewheeling diode 406, third freewheeling diode 407 and the 4th freewheeling diode 408, wherein first absolutely
The collector (that is, the pole C) of edge grid bipolar junction transistor 401 is connected with the collector of third insulated gate bipolar transistor 403
To direct current positive bus 201, the emitter (that is, the pole E) of the second insulated gate bipolar transistor 402 and the 4th insulated gate bipolar
The emitter of transistor 404 is connected to direct current negative busbar 202, the emitter and second of the first insulated gate bipolar transistor 401
The collector of insulated gate bipolar transistor 402 is connected to one end of the primary side of isolating transformer 50 (that is, isolating transformer 50
1 foot), the collector of the emitter of third insulated gate bipolar transistor 403 and the 4th insulated gate bipolar transistor 404 connects
It is connected to the other end (that is, 2 feet of isolating transformer 50) of the primary side of isolating transformer 50, the first insulated gate bipolar transistor
401 and 405 reverse parallel connection of the first freewheeling diode, the second insulated gate bipolar transistor 402 and the second freewheeling diode 406 it is anti-
To in parallel, third insulated gate bipolar transistor 403 and 407 reverse parallel connection of third freewheeling diode, the 4th insulated gate bipolar
408 reverse parallel connection of transistor 404 and the 4th freewheeling diode.
As an example, pre-charge module 60 can include: pre-charge contactor 601, pre-charge resistance 602 and main contactor
603, wherein the one end (that is, 3 feet of isolating transformer 50) on the secondary side of isolating transformer 50 is connected to pre-charge contactor
601 one end (that is, 1 foot of pre-charge contactor 601) and one end of main contactor 603 are (that is, the 1 of main contactor 603
Foot), the other end (that is, 2 feet of main contactor 603) of main contact 603 is connected to power grid, pre-charge contactor 601 it is another
(that is, 2 feet of pre-charge contactor 601) are held to be connected to power grid via pre-charge resistance 602.
Here, when needing to be pre-charged DC bus 20, pre-charge contactor 601 is closed, and main contactor 603 is disconnected
It opens；At the end of precharge, pre-charge contactor 601 is disconnected, and main contactor 603 is closed.
Exemplary embodiment of the present invention also provides a kind of current transformer, and the current transformer includes such as the above exemplary embodiments
The current transformer pusher side common-mode voltage inhibits device.
Exemplary embodiment of the present invention also provides a kind of wind power generating set, and the wind power generating set includes as above-mentioned
Current transformer described in exemplary embodiment, wherein the generating equipment is the generator of the wind power generating set, the power generation
The three-phase output end of machine is connected to the input terminal of the current transformer.
Fig. 5 shows the flow chart of current transformer pusher side common-mode voltage suppressing method according to an exemplary embodiment of the present invention.This
In, the method is applied to the current transformer pusher side common-mode voltage as described in the above exemplary embodiments and inhibits device.
It is by rectification module 10 that the pusher side common mode of generation is electric when current transformer, which is run, generates pusher side common-mode voltage in S10
Pressure is rectified into DC voltage, and by the direct voltage output after rectification to DC bus 20, and right by DC support capacitor 30
The voltage of DC bus 20 boosts.
It by the voltage inversion of DC bus 20 is single-phase AC voltage by controllable inverter module 40 in S20.
In S30, the single-phase AC voltage that controllable inverter module 40 exports is transformed to connect by isolating transformer 50
Enter the alternating voltage to power grid and transformed alternating voltage is linked into power grid.Here, exemplary according to the present invention in execution
During the current transformer pusher side common-mode voltage suppressing method of embodiment, isolating transformer 50 can also to common-mode voltage and power grid into
Row isolation.
As an example, current transformer pusher side common-mode voltage suppressing method according to an exemplary embodiment of the present invention may also include that
Before the current transformer brings into operation, voltage is obtained from power grid by pre-charge module 60, to carry out to DC bus 20
Precharge, until the voltage of DC bus 20 reaches preset value, stopping is pre-charged DC bus 20.For example, described pre-
If value can be 720V.
As an example, the voltage in DC bus 20 reaches the preset value, stopping is pre-charged DC bus 20
The step of after, the secondary side of isolating transformer 50 is directly connected to power grid, and controllable inverter module 40 carries out pulse width modulation
(PWM), within a preset range by the voltage stabilization of DC bus 20.For example, pulse width modulation can be used to pass through to controllable inverse
The control for becoming the IGBT or MOSFET of module 40, by the voltage stabilization of DC bus 20 in the preset range.
Fig. 6 shows the process of current transformer pusher side common-mode voltage suppressing method in accordance with an alternative illustrative embodiment of the present invention
Figure.
Referring to Fig. 6, in S101, when current transformer pusher side common-mode voltage according to an exemplary embodiment of the present invention inhibits on device
After electricity, into initialization process.
In S102, after self-test passes through, the closure of pre-charge contactor 601 of control pre-charge module 60, main contactor
603 disconnect, to be charged by pre-charge resistance 602, isolating transformer 50 and controllable inverter module 40 to DC bus 20.
In S103, the voltage U of DC bus 20 is detecteddWhether the preset value is reached.
In S104, when the voltage for detecting DC bus 20 reaches the preset value, the pre- of pre-charge module 60 is controlled
Charging contactor 601 disconnects, main contactor 603 is closed.As the voltage U of DC bus 20dWhen being unable to reach the preset value, hold
Row S105 notifies failure.
In S106, after the closure of main contactor 603, controllable inverter module 40 carries out PWM modulation work, by DC bus
20 voltage stabilization is in the preset range.
In S107, the starting of current transformer pusher side.
In S108 and S109, when the starting of current transformer pusher side will be total to after generating pusher side common-mode voltage by rectification module 10
Mode voltage is rectified into direct current, and carries out energy stores by DC support capacitor 30.
In S110, when controllable inverter module 40 is detected since 30 energy storage of DC support capacitor causes the electricity of DC bus 20
After pressure increases, closed-loop control can be carried out to the voltage of DC bus 20 to preset the control of the voltage of DC bus 20 described
In range, and the DC voltage of DC bus 20 is converted into alternating voltage.
In S111 and S112, dropped by the single-phase AC voltage that isolating transformer 50 exports controllable inverter module 40
Pressure and isolation, and be finally connected to the grid.
Although having show and described some exemplary embodiments of the invention, it will be understood by those skilled in the art that
It, can be to these in the case where not departing from the principle and spirit of the invention defined by the claims and their equivalents
Embodiment is modified.
Claims (10)
1. a kind of current transformer pusher side common-mode voltage inhibits device, which is characterized in that described device includes: rectification module, direct current mother
Line, DC support capacitor, controllable inverter module and isolating transformer, wherein rectification module, DC support capacitor, controllable inverse
Become module, isolating transformer is arranged in order between the output end of generating equipment and power grid；
Wherein, the input terminal of rectification module is used to connect the output end of the generating equipment, and the output end of the rectification module connects
It is connected to DC bus；
The anode and cathode of DC support capacitor are connected respectively to the direct current positive bus and direct current negative busbar of the DC bus；
DC bus is connected to the primary side of isolating transformer via controllable inverter module, and the secondary side of isolating transformer is connected to electricity
Net.
2. the apparatus according to claim 1, which is characterized in that described device further include: pre-charge module,
Wherein, the secondary side of isolating transformer is connected to power grid via pre-charge module, and pre-charge module obtains voltage pair from power grid
DC bus is pre-charged.
3. device according to claim 1 or 2, which is characterized in that the rectification module is uncontrollable rectifier bridge, described not control
Rectifier bridge includes: first diode, the second diode, third diode and the 4th diode,
Wherein, first diode and the second diode are serially connected between direct current positive bus and direct current negative busbar；Third diode with
4th diode is serially connected between direct current positive bus and direct current negative busbar；The cathode of first diode and the cathode of third diode
It is connected to direct current positive bus, the anode of the anode of the second diode and the 4th diode is connected to direct current negative busbar；
The anode of first diode connects the output end of the generating equipment, the plus earth of third diode.
4. device according to claim 1 or 2, which is characterized in that the controllable inverter module includes: that the first insulated gate is double
Bipolar transistor, the second insulated gate bipolar transistor, third insulated gate bipolar transistor, the 4th insulated gate bipolar crystal
Pipe, the first freewheeling diode, the second freewheeling diode, third freewheeling diode and the 4th freewheeling diode,
Wherein, the collector of the collector of the first insulated gate bipolar transistor and third insulated gate bipolar transistor is connected to
The emitter of direct current positive bus, the emitter of the second insulated gate bipolar transistor and the 4th insulated gate bipolar transistor connects
To direct current negative busbar,
The collector of the emitter of first insulated gate bipolar transistor and the second insulated gate bipolar transistor is connected to isolation
One end of the primary side of transformer, the collection of the emitter of third insulated gate bipolar transistor and the 4th insulated gate bipolar transistor
Electrode is connected to the other end of the primary side of isolating transformer,
Wherein, the first insulated gate bipolar transistor and the first freewheeling diode reverse parallel connection, the second insulated gate bipolar crystal
Pipe and the second freewheeling diode reverse parallel connection, third insulated gate bipolar transistor and third freewheeling diode reverse parallel connection, the
Four insulated gate bipolar transistors and the 4th freewheeling diode reverse parallel connection.
5. the apparatus of claim 2, which is characterized in that the pre-charge module includes: pre-charge contactor, preliminary filling
Resistance and main contactor,
Wherein, the one end on the secondary side of isolating transformer is connected to one end of pre-charge contactor and one end of main contactor, and master connects
The other end of touching is connected to power grid, and the other end of pre-charge contactor is connected to power grid via pre-charge resistance.
6. a kind of current transformer, which is characterized in that the current transformer includes as described in any claim among claim 1 to 5
Current transformer pusher side common-mode voltage inhibit device.
7. a kind of wind power generating set, which is characterized in that the wind power generating set includes unsteady flow as claimed in claim 6
Device, the generating equipment are the generator of the wind power generating set, and the three-phase output end of the generator is connected to the change
Flow the input terminal of device.
8. a kind of current transformer pusher side common-mode voltage suppressing method, which is characterized in that the method is applied to such as claim 1 to 5
Current transformer pusher side common-mode voltage described in middle any claim inhibits device, which comprises
When current transformer, which is run, generates pusher side common-mode voltage, the pusher side common-mode voltage of generation is rectified by direct current by rectification module
Voltage, and by the direct voltage output after rectification to DC bus, and by DC support capacitor to the voltage of DC bus into
Row boosting；
By controllable inverter module by the voltage inversion of DC bus be single-phase AC voltage；
The single-phase AC voltage that controllable inverter module exports is transformed to by isolating transformer to have access to the exchange of power grid
Transformed alternating voltage is simultaneously linked into power grid by voltage.
9. according to the method described in claim 8, it is characterized in that, the method also includes:
Before the current transformer brings into operation, voltage is obtained from power grid by pre-charge module, to carry out to DC bus
Precharge, until the voltage of DC bus reaches preset value, stopping is pre-charged DC bus.
10. according to the method described in claim 9, it is characterized in that, the voltage in the DC bus reaches the preset value,
After the step of stopping is pre-charged DC bus, the secondary side of isolating transformer is directly connected to power grid, controllable inversion mould
Block carries out pulse width modulation, within a preset range by the voltage stabilization of the DC bus.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110868089A (en) * | 2019-12-24 | 2020-03-06 | 新风光电子科技股份有限公司 | Controllable direct-current power supply and control method thereof |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110868089A (en) * | 2019-12-24 | 2020-03-06 | 新风光电子科技股份有限公司 | Controllable direct-current power supply and control method thereof |
| CN110868089B (en) * | 2019-12-24 | 2021-08-13 | 新风光电子科技股份有限公司 | Controllable direct-current power supply and control method thereof |
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