CN104617796A - Modular AC/DC converter and inverter topology - Google Patents
Modular AC/DC converter and inverter topology Download PDFInfo
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- CN104617796A CN104617796A CN201510100068.1A CN201510100068A CN104617796A CN 104617796 A CN104617796 A CN 104617796A CN 201510100068 A CN201510100068 A CN 201510100068A CN 104617796 A CN104617796 A CN 104617796A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a modular flexible DC transmission inverter topology which comprises an AC interface (6), a multiple-winding transformer (1), two or more filters (2), two or more DC-series modular AC/DC converter (3) and a DC interface (5), wherein the AC interface (6) is used for connecting an AC side, and the DC interface (5) is used for connecting a DC side. For a short-term DC fault, the topology can quickly cut off the DC fault current, can ensure the continuous operation of a converter valve, and has no impacts on a communication system. For a permanent DC fault, the topology can quickly cut off the DC fault current, reduces the impacts of the fault on the system, and prevents the fault from being extended.
Description
Technical field
The invention belongs to direct current transportation field, be specifically related to a kind of modular AC/DC converter and converter topology.
Background technology
Flexible direct current power transmission system, when there is direct current one pole ground connection or DC bipolar earth fault, due to the uncontrollability of diode, self cannot turn off overcurrent, the action of AC switch protection can only be relied on to carry out isolated fault.Harmonics is longer for operate time, and diode must bear the overcurrent between age at failure, but overcurrent during fault can considerably beyond the tolerance value of device itself.
Multi-end flexible direct current transmission system, when wherein one end DC line generation direct current one pole ground connection or DC bipolar earth fault, all connected current conversion stations all want locking, jump alternating-current switch.How effectively locking direct fault current, ensures when DC Line Fault, and current conversion station has not become a significant problem of flexible DC power transmission from AC network excision.
The application scenarios such as island powers, offshore drilling platform, offshore wind farm, boats and ships offshore Power supply, energy is substantially all one-way transmission, and therefore the circuit topology of converting plant and Inverter Station can be optimized process.
Summary of the invention
Object of the present invention, be to provide a kind of modular AC/DC converter and flexible direct-current transmission converter topology, it can turn off direct-current short circuit fault current.
In order to reach above-mentioned purpose, solution of the present invention is: a kind of modular AC/DC converter, comprise: exchange interface (12), three-phase bridge (7), energy-storage travelling wave tube (8), resistance (9), direct current first exit (11) and direct current second exit (15), energy-storage travelling wave tube (8) and resistance (9) are all connected in parallel on the DC side of three-phase bridge (7), it is characterized in that, described converter also comprises current-limiting circuit (10), at least one power semiconductor (13) and at least one diode (14) is comprised in described current-limiting circuit, the positive pole of power semiconductor (13) is connected with the positive pole of energy-storage travelling wave tube (8), the negative pole of power semiconductor (13), the N pole of diode (14) is connected with direct current first exit (11), the P pole of diode (14), the negative pole of energy-storage travelling wave tube (8) is connected with direct current second exit (15).
In such scheme, described power semiconductor (13) is insulated gate bipolar transistor IGBT, the positive pole of power semiconductor (13) is the collector electrode C of IGBT, and the negative pole of power semiconductor (13) is the emitter E of IGBT.
In such scheme, described power semiconductor (13) is diode, and the positive pole of power semiconductor (13) is the N pole of diode, and the negative pole of power semiconductor (13) is the P pole of diode.
In such scheme, comprise brachium pontis and lower brachium pontis, described upper and lower brachium pontis has included at least one converter as claimed in claim 1, all converters in described same brachium pontis connect in the same way, in upper brachium pontis, the first exit of first converter is as the positive limit of this converter, in lower brachium pontis, the second exit of last converter is as the negative pole point of this converter, and described positive and negative limit is all for accessing in DC network; And in upper brachium pontis in the second exit of last converter and lower brachium pontis the first exit of first converter be interconnected.
The invention has the beneficial effects as follows:
1) topology of the present invention cuts off electric current by power semiconductor S1 (13), only needs tens microseconds just can cut off direct fault current to several milliseconds.Therefore topology of the present invention can cut off direct fault current fast, decreases the impact of fault to system, and prevents failure propagation.
2) topology of the present invention is when cutting off direct fault current, rely on the clamping action of power semiconductor S2 (14), the maximum voltage that power semiconductor S1 (13) bears is that energy-storage travelling wave tube (8) both end voltage adds diode reverse recovery voltage, disparate modules turns off asynchronous, can not cause the withstand voltage difference that device bears.Therefore topology of the present invention adopts low pressure and low power semiconductor device just can turn off fault current.
3) topology of the present invention can disengagement failure electric current fast by power semiconductor S1 (13), coordinates the high-speed switch that DC side is installed, can isolated DC fault fast.Therefore topology of the present invention provides a good solution for Multi-end flexible direct current transmission and DC distribution net.
Accompanying drawing explanation
Fig. 1 is the overall circuit schematic diagram of modular flexible direct-current transmission converter;
Fig. 2 is the modular AC/DC converter topology schematic diagram that the present invention proposes;
Fig. 3 is several circuit diagrams of filter of the present invention;
Fig. 4 a to Fig. 4 c is three embodiments of a kind of modular flexible direct-current transmission converter topology of the present invention.
Embodiment
Adopt one to comprise the flexible direct-current transmission converter topology of at least two modularization AC/DC converters (3), it is characterized in that described converter topology also comprise interchange interface (6) for connecting AC, multi winding transformer (1), at least two group filters (2), at least two with the DC interface (5) for being connected DC side; Modularization AC/DC converter (3) DC interface of described at least two is connected mutually.The phase shifting transformer that described multi winding transformer (1) is common multi winding transformer, winding assisted by the multi winding transformer of the auxiliary winding of band, phase shifting transformer or band.Described filter (2) is single inductance (16), LC filter (17), LCL filter (18) or a section lead (19).Described modular AC/DC converter (3), comprise: exchange interface (12), three-phase bridge (7), energy-storage travelling wave tube (8), resistance (9), direct-flow positive pole interface (11) and negative DC interface (15), it is characterized in that: described converter also comprises current-limiting circuit (10), at least two power semiconductors are comprised in described current-limiting circuit, the positive pole of power semiconductor (13) is connected with the positive pole of energy-storage travelling wave tube (8), the negative pole of power semiconductor (13), positive DC interface (11) is extremely connected with the N of diode (14), the P pole of diode (14), direct current negative pole interface (15) is connected with the negative pole of energy-storage travelling wave tube (8).Described converter, it is characterized in that described power semiconductor (13) is insulated gate bipolar transistor (IGBT), the positive pole of power semiconductor (13) is the collector electrode C of IGBT, and the negative pole of power semiconductor (13) is the emitter E of IGBT.
The application scenarios such as island powers, offshore drilling platform, offshore wind farm, boats and ships offshore Power supply, energy is substantially all one-way transmission.For the receiving terminal of energy, the power semiconductor (13) of described modular AC/DC converter (3) is diode, the positive pole of power semiconductor (13) is the N pole of diode, and the negative pole of power semiconductor (13) is the P pole of diode.
Below with reference to accompanying drawing, technical scheme of the present invention is described in detail.
The overall circuit schematic diagram of modular flexible direct-current transmission converter as shown in Figure 1, generally comprise the interchange interface 6 for connecting AC, multi winding transformer 1, filter 2, AC/DC converter 3, for connecting the DC interface 5 of DC side.
The present invention proposes a kind of modular AC/DC converter 3) as shown in Figure 2, comprise: exchange interface 12, three-phase bridge 7, energy-storage travelling wave tube 8, resistance 9, direct current first exit 11 and direct current second exit 15, energy-storage travelling wave tube 8 and resistance 9 are all connected in parallel on the DC side of three-phase bridge 7, it is characterized in that, described converter also comprises current-limiting circuit 10, at least one power semiconductor 13 and at least one diode 14 is comprised in described current-limiting circuit, the positive pole of power semiconductor 13 is connected with the positive pole of energy-storage travelling wave tube 8, the negative pole of power semiconductor 13, the N pole of diode 14 is connected with direct current first exit 11, the P pole of diode 14, the negative pole of energy-storage travelling wave tube 8 is connected with direct current second exit 15.
Fig. 4 a is an embodiment according to a kind of modular flexible direct-current transmission converter topology of the present invention.A kind of modular flexible direct-current transmission converter topology comprises: for connecting the interchange interface (6) of AC; Multi winding transformer (1); Two LC filters (2); Two modularization AC/DC converters (3); For connecting the DC interface (5) of DC side.Wherein the DC interface of modularization AC/DC converter (3,4) is connected in series.Power semiconductor S1 (13) adopts IGBT, power semiconductor S2 (14) adopts diode, the C pole of IGBT (13) is connected with the anode of energy-storage travelling wave tube (8), the E pole of IGBT (13), the N pole of diode (14) are connected with direct-flow positive pole interface (11), and P pole, energy-storage travelling wave tube (8) negative pole of diode (14) are connected with direct current negative pole interface (15).When systems are functioning properly, IGBT (13) and IGBT (20) is open-minded, and direct current can flow into modularization AC/DC converter (3,4) also can flow out modularization AC/DC converter (3,4); When DC side is short-circuited fault, cut off direct fault current by turning off IGBT (13) and IGBT (20).Because system parameters is inconsistent, pulse is asynchronous, the not equal reason of IGBT characteristic, IGBT (13) and IGBT (20) can not turn off simultaneously.Suppose that IGBT (13) first turns off, IGBT (20) does not turn off, and energy-storage travelling wave tube (24) injects direct current by IGBT (20) and diode (14) to short dot.The voltage that now IGBT (13) bears is energy-storage travelling wave tube (8) both end voltage.If there is no diode (14), IGBT (13) first turns off, IGBT (20) does not turn off, the voltage that IGBT (13) bears be energy-storage travelling wave tube (8) voltage and energy-storage travelling wave tube (24) voltage and, number of modules is more, and the voltage that the IGBT (13) turned off the earliest bears is higher.Therefore in order to adopt the IGBT of low pressure to turn off fault direct current, diode (14) is absolutely necessary.IGBT (13) and IGBT (20) can close direct fault current in tens microseconds are to several milliseconds, converter valve can normally locking or change into STATCOM run, therefore can ensure DC Line Fault to AC system impact minimum.The multi winding transformer (1) of the present embodiment also can be the multi winding transformer of phase shifting transformer, the auxiliary winding of band; The filter (2) of the present embodiment also can be inductance filter (16), LCL filter (18) or wire (19); The three-phase bridge (7) of the present embodiment also can be thyristor, diode or IGCT; The present embodiment only has 2 modularization AC/DC modules (3), and concrete enforcement can be 3 modules or more module number.The mode of connection that also can adopt Fig. 4 b of the present embodiment, the N pole of energy-storage travelling wave tube (8) positive pole, diode (14) is connected with direct-flow positive pole interface (11), and the C pole of IGBT (13), the P pole of diode (14) are connected with direct current negative pole interface (15), the E pole of IGBT (13) is connected with energy-storage travelling wave tube (8) negative pole.Fig. 4 a is identical with the working method of Fig. 4 b.
Fig. 4 c is an embodiment according to a kind of modular flexible direct-current transmission converter topology of the present invention.A kind of modular flexible direct-current transmission converter topology comprises: for connecting the interchange interface (6) of AC; The multi winding transformer (1) of the auxiliary winding of band; Two LC filters (2); Two modularization AC/DC converters (3); For connecting the DC interface (5) of DC side.Wherein the DC interface of modularization AC/DC converter (3,4) is connected in series.Power semiconductor S1 (13) adopts diode, power semiconductor S2 (14) adopts diode, the N pole of diode (13) is connected with the anode of energy-storage travelling wave tube (8), the P pole of diode (13), the N pole of diode (14) are connected with direct-flow positive pole interface (11), and P pole, energy-storage travelling wave tube (8) negative pole of diode (14) are connected with direct current negative pole interface (15).This embodiment is applicable to city DC distribution, boats and ships offshore power supply, island power etc. only as the application scenario of energy receiving terminal.Auxiliary winding (25) function of the multi winding transformer (1) of the auxiliary winding of band is to provide the power supply of 380V.When systems are functioning properly, direct current inputs energy by diode (11) to energy-storage travelling wave tube (8).Suppose do not have diode (14,21), when DC side is short-circuited fault, diode (13,20) blocks energy-storage travelling wave tube (8,24) and injects fault current to DC Line Fault point.Recovering in reverse blocking capability process at diode (13,20), have a bit of time, electric current flows to DC side from energy-storage travelling wave tube (8,24).Because reverse recovery time of diode is different, it is inconsistent that diode (13) and diode (20) recover Xining.Suppose that diode (13) first recovers reverse blocking capability, the voltage that now diode bears be energy-storage travelling wave tube (8) voltage and energy-storage travelling wave tube (24) voltage and.In order to reduce the overvoltage of bearing when diode (13) and diode (20) recover in direction, add diode (14,21).When diode (13) first recovers reverse blocking capability, diode (14) because bearing the forward voltage of energy-storage travelling wave tube (24) and conducting, thus the voltage clamping at diode (13) two ends to energy-storage travelling wave tube (8) both end voltage.The reverse blocking of diode only has recovery time can in a few microsecond to tens microseconds, therefore the present embodiment can quick closedown direct fault current, converter valve can normally locking or change into STATCOM run, therefore can ensure DC Line Fault to AC system impact minimum.
The multi winding transformer (1) of the present embodiment also can be the multi winding transformer of phase shifting transformer, the auxiliary winding of band.As shown in Figure 3, the filter (2) of the present embodiment also can be inductance filter (16), LCL filter (18) or wire (19).The present embodiment only has 2 modularization AC/DC modules (3), and concrete enforcement can be 3 modules or more module number.
Flexible direct current power transmission system; when there is direct current one pole ground connection or DC bipolar earth fault, due to the uncontrollability of diode, self overcurrent cannot be turned off; the action of AC switch protection can only be relied on to carry out isolated fault, alternating-current switch disengagement failure current time will a few tens of milliseconds to hundreds of millisecond.Topology of the present invention cuts off electric current by power semiconductor S1 (13), only needs tens microseconds just can cut off direct fault current to several milliseconds.Therefore topology of the present invention can cut off direct fault current fast, decreases the impact of fault to system, and prevents failure propagation.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (4)
1. a modular AC/DC converter, comprise: exchange interface (12), three-phase bridge (7), energy-storage travelling wave tube (8), resistance (9), direct current first exit (11) and direct current second exit (15), energy-storage travelling wave tube (8) and resistance (9) are all connected in parallel on the DC side of three-phase bridge (7), it is characterized in that, described converter also comprises current-limiting circuit (10), at least one power semiconductor (13) and at least one diode (14) is comprised in described current-limiting circuit, the positive pole of power semiconductor (13) is connected with the positive pole of energy-storage travelling wave tube (8), the negative pole of power semiconductor (13), the N pole of diode (14) is connected with direct current first exit (11), the P pole of diode (14), the negative pole of energy-storage travelling wave tube (8) is connected with direct current second exit (15).
2. a kind of modular AC/DC converter as claimed in claim 1, it is characterized in that, described power semiconductor (13) is insulated gate bipolar transistor IGBT, the positive pole of power semiconductor (13) is the collector electrode C of IGBT, and the negative pole of power semiconductor (13) is the emitter E of IGBT.
3. a kind of modular AC/DC converter as claimed in claim 1, it is characterized in that, described power semiconductor (13) is diode, the positive pole of power semiconductor (13) is the N pole of diode, and the negative pole of power semiconductor (13) is the P pole of diode.
4. a converter topology, it is characterized in that, comprise brachium pontis and lower brachium pontis, described upper and lower brachium pontis has included at least one converter as claimed in claim 1, all converters in described same brachium pontis connect in the same way, in upper brachium pontis, the first exit of first converter is as the positive limit of this converter, and in lower brachium pontis, the second exit of last converter is as the negative pole point of this converter, and described positive and negative limit is all for accessing in DC network; And in upper brachium pontis in the second exit of last converter and lower brachium pontis the first exit of first converter be interconnected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510100068.1A CN104617796A (en) | 2015-03-06 | 2015-03-06 | Modular AC/DC converter and inverter topology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510100068.1A CN104617796A (en) | 2015-03-06 | 2015-03-06 | Modular AC/DC converter and inverter topology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106300298A (en) * | 2016-09-12 | 2017-01-04 | 北京交通大学 | A kind of DC side failure protecting device of voltage-source type combining inverter |
| CN106374420A (en) * | 2016-11-16 | 2017-02-01 | 许继集团有限公司 | DC micro grid converter |
| CN112994150A (en) * | 2021-02-05 | 2021-06-18 | 北京四方继保自动化股份有限公司 | Overcurrent and overvoltage fault protection system and method for V2G charging pile |
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|---|---|---|---|---|
| CN106300298A (en) * | 2016-09-12 | 2017-01-04 | 北京交通大学 | A kind of DC side failure protecting device of voltage-source type combining inverter |
| CN106374420A (en) * | 2016-11-16 | 2017-02-01 | 许继集团有限公司 | DC micro grid converter |
| CN112994150A (en) * | 2021-02-05 | 2021-06-18 | 北京四方继保自动化股份有限公司 | Overcurrent and overvoltage fault protection system and method for V2G charging pile |
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Application publication date: 20150513 |