CN207559579U - DC fan transmission system - Google Patents
DC fan transmission system Download PDFInfo
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- CN207559579U CN207559579U CN201721856242.6U CN201721856242U CN207559579U CN 207559579 U CN207559579 U CN 207559579U CN 201721856242 U CN201721856242 U CN 201721856242U CN 207559579 U CN207559579 U CN 207559579U
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The utility model provides a kind of DC fan transmission system, the direct current transportation busbar being connect including multigroup DC fan and with DC fan output terminal described in every group；DC fan described in every group includes the wind energy conversion system, Multiple coil direct driving motor, current transformer, single-phase transformer, the single-phase rectifier that are sequentially connected in series, and the output terminal of single-phase rectifier is connected with the direct current transportation busbar.The DC fan transmission system of the utility model uses the mode of multiple Multiple coil direct driving motor parallel connections with direct current transportation, voltage ripple of power network caused by when solving the problems, such as wind speed variation, and reduces the cost of transmission line of electricity, promotes transmission distance；Meanwhile generator and current transformer can be all disposed in cabin, lead to the rectifier that too small amount of midium voltage cable is transferred to bottom of towe by high tower, substantially reduce the pressure of untying the mooring rope of blower fan system.
Description
Technical Field
The utility model relates to a wind-powered electricity generation transmission technology field especially relates to a direct current fan transmission system.
Background
The traditional low-voltage direct-drive alternating current fan alternating current power transmission topology is shown in fig. 1 and fig. 2 and is composed of N groups of low-voltage alternating current fans and a medium-voltage 35KV bus bar alternating current bus. The low-voltage alternating current fan is internally composed of a wind turbine, a direct drive motor, a low-voltage converter and a step-up transformer. The low-voltage converter converts 690V low-voltage large-current electric energy into 35KV medium-voltage alternating-current voltage with a higher voltage level through a booster transformer matched with a fan, and the medium-voltage alternating-current voltage is transmitted to a three-phase alternating-current bus.
However, in practical applications, the following disadvantages exist in the use of three-phase ac power transmission:
(1) the voltage output by the converter is low, the current is high, a large amount of precious metal low-voltage cables are needed, and the loss of the whole system is high;
(2) the generator is arranged in a cabin on the top of the tower, the converter is generally arranged in a tower barrel on the bottom of the tower, a large number of low-voltage cables need to be transmitted to the converter on the bottom of the tower through a high tower barrel, and great pressure is caused on cable release of a fan system;
(3) with the increasing of the capacity of the fan, the capacity of the converter is increased, the capacity of the low-voltage converter needs to be enlarged through parallel connection, technical problems such as current equalization and circulation are caused, and the reliability of the fan system is affected.
(4) The transmission line is a three-phase cable transmission line, the cost of the transmission line is high, the transmission distance is short, and the fluctuation of the grid voltage is easily caused by the change of the wind speed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a direct current fan power transmission system, the three-phase alternating current that will be located the top of the tower and directly drive the motor and convert into the direct current and transmit electricity to the cable pressure, the reduction system loss and the cost of untieing that reduce fan system.
In order to achieve the above object, the present invention provides the following technical solutions:
a direct current fan power transmission system comprises a plurality of groups of direct current fans and a direct current power transmission bus connected with the output end of each group of direct current fans; each group of direct current fans comprises a wind turbine, a multi-winding direct drive motor, a current transformer, a single-phase transformer and a single-phase rectifier which are sequentially connected in series, wherein the current transformer is used for converting three-phase alternating current output by the multi-winding direct drive motor into single-phase alternating current and outputting the single-phase alternating current to the primary side of the single-phase transformer; and the output end of a single-phase rectifier in the direct current fan is connected with the direct current transmission bus.
Preferably, the rotor of the multi-winding direct drive motor is coaxially connected with the wind turbine, the stator is provided with 3N windings, and every three windings form a group of three-phase alternating current system, wherein N is more than or equal to 3.
Preferably, the converter consists of a plurality of AC/DC/AC circuits cascaded in sequence; the input end of each AC/DC/AC circuit is connected with a group of three-phase windings of the multi-winding direct drive motor, each AC/DC/AC circuit is provided with two output terminals, the second output terminal of the previous AC/DC/AC circuit is connected with the first output terminal of the next AC/DC/AC circuit, and the first output terminal of the first AC/DC/AC circuit and the second output terminal of the last AC/DC/AC circuit are connected with the two input ends of the primary side of the single-phase transformer in a one-to-one correspondence manner.
Preferably, the AC/DC/AC circuit includes a three-phase PWM rectifier, a DC capacitor, a discharge resistor, a chopper, and an H-bridge inverter, which are connected in series in sequence, wherein a first output terminal and a second output terminal of the AC/DC/AC circuit are two output terminals of the H-bridge inverter, respectively.
Preferably, the AC/DC/AC circuit further comprises a bleed-off resistor; the chopper comprises two power devices which are connected in series; one end of the bleeder resistor is connected to the transmission line between the two power devices, and the other end of the bleeder resistor is connected to a positive bus in the AC/DC/AC circuit.
Preferably, the AC/DC/AC circuit is an integrated power unit.
Preferably, the single-phase rectifier is an H-bridge structure having four bridge arms, each bridge arm is provided with an MMC module and an energy storage inductor, the two bridge arms which are symmetrically distributed from top to bottom are electrically connected in series through the energy storage inductor, each MMC module is connected with one port of the secondary side of the single-phase transformer through the energy storage inductor, and two output terminals of the single-phase rectifier are connected with the two dc power transmission buses in a one-to-one correspondence manner.
Preferably, the MMC module comprises a plurality of cascaded sub-modules, and the second terminal of the sub-module is connected with the first terminal of the sub-module, wherein the first terminal of the first sub-module is electrically connected with the energy storage inductor, and the second terminal of the last sub-module is connected with the direct current transmission bus.
Furthermore, the MMC module further comprises a plurality of bypass switches which are connected with the sub-modules in a one-to-one correspondence mode, and the bypass switches act to switch the circuit to a loop where the bypass switches are located when the sub-modules are in fault, so that the normal work of the MMC module is guaranteed.
Preferably, the sub-module comprises a half-bridge circuit formed by two series-connected power devices and a direct current support capacitor connected across a bus of the half-bridge circuit.
Compared with the prior art, the utility model discloses a scheme has following advantage:
1. the utility model discloses a direct current fan power transmission system comprises parallelly connected direct current fan of multiunit and direct current transmission generating line, wherein, the low frequency three-phase alternating current that the multi-winding directly drives the motor and changes into single-phase alternating current through the converter, then through single-phase transformer step up, single-phase rectifier rectification and step up after converging to the direct current transmission generating line, through multiunit direct current fan realizes converting the low-voltage alternating current that the wind energy conversion machine produced into direct current medium voltage electricity and carries the transport generating line in, arouses the voltage fault problem of transmission of electricity generating line when arbitrary group's fan that easily appears breaks down when having avoided direct current fan to adopt series connection structure, and the grid voltage that causes when solving the wind speed change fluctuates the problem to reduce transmission line's cost, promote.
2. Because the voltage output by the converter is higher and the current is smaller, only a small number of medium-voltage cables are needed, and the loss of the whole system is reduced.
3. The generator and the converter are designed in a centralized mode in the engine room, a small number of medium-voltage cables are transmitted to the converter at the bottom of the tower through the high tower barrel, and the cable releasing pressure of the fan system is greatly reduced.
4. The capacity is enlarged by increasing the voltage level, the technical problems of current equalization, circulation and the like are avoided, and the reliability of the fan system is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a circuit diagram of a prior art low voltage direct drive AC fan AC power transmission system;
FIG. 2 is a schematic diagram of an AC fan of the system of FIG. 1;
fig. 3 is a circuit diagram of the dc fan power transmission system of the present invention;
FIG. 4 is a schematic structural diagram of a DC fan in the DC fan power transmission system shown in FIG. 3;
fig. 5 is a schematic structural diagram of a converter according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a single-phase rectifier according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.
As shown in fig. 3 to 6, the utility model provides a direct current fan power transmission system, including parallelly connected direct current fan 1 of multiunit and direct current transmission bus 2, the multiunit the electric current of direct current fan 1 output converges direct current transmission bus 2. The direct current fan 1 is provided with P groups, and P is more than or equal to 2. The direct current fan 1 is converged to the direct current transmission buses 2 in a parallel connection mode, and power is transmitted through the two direct current transmission buses 2, so that the cost of a power transmission system can be reduced, and the power transmission distance can be increased. Meanwhile, the voltage of the direct-current transmission bus 2 is controllable, so that the problem of power grid voltage fluctuation caused by wind speed change can be solved.
Referring to fig. 4, preferably, the dc fan 1 includes a wind turbine 11, a multi-winding direct drive motor 12, an inverter 13, a single-phase transformer 14 and a single-phase rectifier 15 connected in series in sequence.
Specifically, the multi-winding direct drive motor 12 is preferably a permanent magnet direct drive wind turbine generator, a rotor of the generator is coaxially connected with the wind turbine 11, a stator of the generator is provided with 3N (N is greater than or equal to 3) windings, and every three windings form an ABC three-phase alternating current system. Therefore, the voltage can be restrained by limiting the number of windings of the multi-winding direct drive motor 12, and the voltage output to the direct current transmission bus 2 can be controlled.
Referring to fig. 5, correspondingly, the converter 13 is formed by cascading N AC/DC/AC circuits, and the AC/DC/AC circuits are integrated power units. Each of the AC/DC/AC circuits includes a three-phase PWM rectifier 131, a bus capacitor, a discharge resistor, a chopper 132, and an H-bridge inverter 133, which are connected in series in this order. The input terminal of the three-phase PWM rectifier 131 is the input terminal of the AC/DC/AC circuit, and is connected to a set of three-phase windings of the multi-winding direct drive motor 12. The second output terminal of the H-bridge inverter 133 of the previous stage AC/DC/AC circuit is connected to the first output terminal of the H-bridge inverter 133 of the next stage AC/DC/AC circuit, and the first output terminal of the H-bridge inverter 133 of the first stage AC/DC/AC circuit and the second output terminal of the H-bridge inverter 133 of the last stage AC/DC/AC circuit are connected to two terminals on the primary side of the single-phase transformer 14 in a one-to-one correspondence. Therefore, the converter 13 can convert the three-phase alternating current converted by the multi-winding direct drive motor 12 into single-phase alternating current through rectification and inversion, so that the current is reduced, and the voltage is increased.
Preferably, the chopper 132 includes two transistors connected in series and two freewheeling diodes connected in anti-parallel with the transistors in a one-to-one correspondence.
Further, the AC/DC/AC circuit further includes a bleeder resistor having one end connected to the transmission line between the two transistors and the other end connected to a positive bus within the AC/DC/AC circuit.
The utility model discloses an among the direct current fan power transmission system, adopt a plurality of AC DC AC circuit to cascade the medium voltage converter 13 that forms, the voltage of output is high, and the electric current is little, only needs the medium voltage cable that a small amount is few, and complete machine system's loss is less.
Referring to fig. 6, preferably, the single-phase rectifier 15 is a single-phase MMC (modular multi-level converter) rectifier, and is configured to rectify and boost the ac power at the secondary side of the single-phase transformer 14, and then converge the rectified ac power to the dc transmission bus 2. The single-phase rectifier 15 is designed to be an H-bridge structure with four bridge arms, each bridge arm is provided with an MMC module 151 and an energy storage inductor 152, the two bridge arms which are symmetrically distributed up and down are connected in series and electrically connected through the energy storage inductor 152, each MMC module 151 is connected with one port of the secondary side of the single-phase transformer 14 through the energy storage inductor 152, and two output terminals of the single-phase rectifier 15 are connected with the two direct-current transmission buses 2 in a one-to-one correspondence manner.
The energy storage inductor 152 is used as a link for power transmission between the voltage source converter valve and the alternating current system, determines the power transmission capacity of the converter valve, controls active power and reactive power, simultaneously inhibits switching frequency harmonic quantity in output current and voltage of the converter valve, and can inhibit current rise rate and inhibit short-circuit current peak value during short circuit.
The MMC module 151 is composed of a plurality of cascaded sub-modules 1511. And a second terminal of the submodule 1511 is connected with a first terminal of a next-stage submodule 1511, wherein a first terminal of the first-stage submodule 1511 is electrically connected with the energy storage inductor 152, and a second terminal of the last-stage submodule 1511 is connected with the direct-current transmission bus 2. The number of the sub-modules 1511 is set by a technician according to the voltage level of the dc transmission bus 2, and the sum of the voltage values of all the sub-modules 1511 in the MMC module 151 is the voltage level of the dc transmission bus 2.
Further, MMC module 151 still include a plurality of with it is a plurality of sub-module 1511 one-to-one connection's bypass switch, be used for when sub-module 1511 breaks down, switch the circuit to the correspondence the return circuit that bypass switch belongs to, guarantee MMC module's normal work, and then avoid leading to the busbar voltage to break down because sub-module breaks down.
Preferably, the sub-module 1511 includes a half-bridge circuit formed by two transistors connected in series, two freewheeling diodes connected in anti-parallel with the transistors in one-to-one correspondence, and a dc support capacitor connected across the high-voltage side of the half-bridge circuit.
Preferably, the transistor is an insulated gate bipolar transistor. In other embodiments, the transistor may be replaced by other power devices with controllable switching function.
When the electric energy is transmitted from the rectifier 15 to the motor, the single-phase medium-voltage cascade rectifier 15 becomes a single-phase medium-voltage cascade inverter, and the direct-current electric energy is converted into alternating-current electric energy, so that the bidirectional transmission of the electric energy is realized. The rectifier 15 enlarges the capacity in a cascading mode, avoids the problems of current sharing or circulation and the like, and improves the reliability of the fan power transmission system.
The utility model discloses in, 1 parallelly connected access transmission system of direct current fan, direct current transmission bus 2 voltage cascades through cascaded H bridge dc-to-ac converter, cascades through single-phase transformer, the single-phase MMC rectifier rectification that the rethread corresponds and forms, even one or more fan breaks down, can not arouse the trouble of direct current transmission bus 2 voltage yet, has improved the stability of system.
The utility model discloses a direct current fan transmission system can all concentrate generator and converter 13 and locate the cabin in, passes through the high barrel tower through a small amount of middling pressure cable, transmits the single-phase rectifier 15 at the bottom of the tower, has reduced the pressure of untwisting of fan system greatly. The utility model provides an among the direct current fan transmission system, still come the limiting voltage through the quantity of control generator winding, come the rising voltage level and then enlarge the capacity through converter 13, single-phase transformer 14 and rectifier 15, avoided flow equalizing and the problem of circulation, promoted the reliability of fan system.
To sum up, the utility model discloses a multiunit wind generating set of parallel structure carries the direct current transmission generating line with the low frequency alternating current conversion that the wind energy conversion produced in the direct current piezoelectricity, realizes reducing the power loss and the transmission of electricity cost of electric energy in transportation process, and the problem of voltage fault appears in the transmission of electricity generating line that arouses when avoiding adopting wind generating set's series structure moreover.
The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A direct current fan power transmission system is characterized by comprising a plurality of groups of direct current fans and a direct current power transmission bus connected with the output end of each group of direct current fans;
each group of direct current fans comprises a wind turbine, a multi-winding direct drive motor, a converter, a single-phase transformer and a single-phase rectifier which are connected in series in sequence, wherein,
the converter is used for converting three-phase alternating current output by the multi-winding direct drive motor into single-phase alternating current and outputting the single-phase alternating current to the primary side of the single-phase transformer;
the input end of the single-phase rectifier is connected with the two ports of the secondary side of the single-phase transformer, and the output end of the single-phase rectifier is connected with the direct-current transmission bus.
2. The direct current fan power transmission system of claim 1, wherein a rotor of the multi-winding direct drive motor is coaxially connected with a wind turbine, a stator is provided with 3N windings, each three windings form a group of three-phase alternating current system, and N is more than or equal to 3.
3. The direct current fan power transmission system of claim 1, wherein the converter is comprised of a plurality of sequentially cascaded AC/DC/AC circuits; wherein,
the input end of each AC/DC/AC circuit is connected with a group of three-phase windings of the multi-winding direct drive motor, each AC/DC/AC circuit is provided with two output terminals, the second output terminal of the AC/DC/AC circuit is connected with the first output terminal of the next-stage AC/DC/AC circuit, and the first output terminal of the first-stage AC/DC/AC circuit and the second output terminal of the last-stage AC/DC/AC circuit are connected with the two input terminals of the primary side of the single-phase transformer in a one-to-one correspondence manner.
4. The direct current fan power transmission system of claim 3, wherein the AC/DC/AC circuit comprises a three-phase PWM rectifier, a bus capacitor, a discharge resistor, a chopper, and an H-bridge inverter connected in series, wherein the first and second output terminals of the AC/DC/AC circuit are two output terminals of the H-bridge inverter, respectively.
5. The direct current fan power transmission system of claim 4, wherein the AC/DC/AC circuit further comprises a bleed resistor;
the chopper comprises two power devices which are connected in series;
one end of the bleeder resistor is connected between the two power devices, and the other end of the bleeder resistor is connected to a positive bus in the AC/DC/AC circuit.
6. The direct current fan power transmission system of any one of claims 3 to 5, wherein the AC/DC/AC circuit is an integrated power unit.
7. The direct current fan power transmission system according to claim 1, wherein the single-phase rectifier is an H-bridge structure having four bridge arms, each bridge arm is provided with an MMC module and an energy storage inductor, two bridge arms distributed vertically are electrically connected in series through the energy storage inductor, each MMC module is connected with one port of the secondary side of the single-phase transformer through the energy storage inductor, and two output terminals of the single-phase rectifier are connected with two direct current transmission buses in a one-to-one correspondence manner.
8. The direct current fan power transmission system of claim 7, wherein the MMC module is comprised of a plurality of cascaded sub-modules, wherein a second terminal of a previous sub-module is connected to a first terminal of a next sub-module, wherein the first terminal of the first sub-module is electrically connected to the energy storage inductor and the second terminal of the last sub-module is connected to the direct current transmission bus.
9. The direct current fan power transmission system of claim 8, wherein the MMC module further comprises a plurality of bypass switches connected in one-to-one correspondence with the plurality of sub-modules.
10. The DC fan power transmission system of claim 8, wherein the sub-module comprises a half-bridge circuit formed by two series-connected power devices and a DC support capacitor connected across a bus of the half-bridge circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721856242.6U CN207559579U (en) | 2017-12-26 | 2017-12-26 | DC fan transmission system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721856242.6U CN207559579U (en) | 2017-12-26 | 2017-12-26 | DC fan transmission system |
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| CN207559579U true CN207559579U (en) | 2018-06-29 |
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| CN201721856242.6U Active CN207559579U (en) | 2017-12-26 | 2017-12-26 | DC fan transmission system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947222A (en) * | 2017-12-26 | 2018-04-20 | 北京金风科创风电设备有限公司 | Direct current fan power transmission system |
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- 2017-12-26 CN CN201721856242.6U patent/CN207559579U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947222A (en) * | 2017-12-26 | 2018-04-20 | 北京金风科创风电设备有限公司 | Direct current fan power transmission system |
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