CN110535166A - A kind of more drop point DC transmission systems of mixing series connection - Google Patents
A kind of more drop point DC transmission systems of mixing series connection Download PDFInfo
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- CN110535166A CN110535166A CN201910962667.2A CN201910962667A CN110535166A CN 110535166 A CN110535166 A CN 110535166A CN 201910962667 A CN201910962667 A CN 201910962667A CN 110535166 A CN110535166 A CN 110535166A
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- unidirectional current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The present invention relates to a kind of more drop point DC transmission systems of mixing series connection, belong to technical field of direct current power transmission.Transmission system of the present invention includes a sending end AC network, silicon controlled rectifier, DC line, unidirectional current type full-bridge modules multilevel converter, three-phase ac transformer and receiving end AC network；The ac output end of unidirectional current type full-bridge modules multilevel converter is connected to receiving end AC network by corresponding three-phase ac transformer respectively；The DC terminal of unidirectional current type full-bridge modules multilevel converter is sequentially connected in series, then the DC terminal of silicon controlled rectifier is connected to by DC line；The exchange of silicon controlled rectifier is terminated into sending end AC network.The characteristics of present invention is irreversibly delivered for remote large capacity Hybrid HVDC power, each receiving end line commutation device realizes the power conversion of alternating current-direct current using unidirectional current type full-bridge modules multilevel converter, makes that the cost of receiving end line commutation device is lower, densification degree is higher.
Description
Technical field
The present invention relates to a kind of more drop point DC transmission systems of mixing series connection, belong to technical field of direct current power transmission.
Background technique
The characteristics of energy and load center are distributed determines that a large amount of electric energy dependent on long-distance sand transport, is handed over relative to high pressure
Power transmission mode is flowed, is all had in terms of technical and economy in remote large capacity electrical energy transportation using D.C. high voltage transmission
Advantage.Conventional high-pressure direct current transportation based on thyristor transverter (Line Commutated Converter, LCC) has obtained
Extensive use is arrived.When in load intensive area, there are when more times conventional high-pressure DC power transmission lines drop point simultaneously, receiving end is electric
Net intensity will seem relative deficiency, increase the risk of LCC commutation failure, and bring system instability.With modularization
The voltage class and capacity of multilevel converter (Modular Multilevel Converter, MMC) are continuously improved, and have got over
More tend in receiving end power grid using MMC technology, to avoid commutation failure risk and reduce the requirement to grid strength.But
It is that LCC has many advantages, such as that at low cost, high-efficient, voltage rating and rated current are high, is still that HVDC transmission line sending end is changed
Flow the preferred embodiment of device.Therefore, use the mixed high-voltage of MMC straight using silicon controlled rectifier, in receiving end power grid in sending end power grid
Transmission system is flowed, the respective advantage of LCC and MMC can be sufficiently combined, the following remote Large Capacity HVDC Techniques will be become
Development trend.
In present applications ' the tail must be taken, very big demand is that the energy centre for concentrating electric power from one is sent to multiple receiving end exchanges
Power grid forms multiple direct current drop points.The inverter of a large capacity can be used to be respectively adopted more multiple in sending end power grid
The smaller inverter of a relative capacity connects multiple receiving end power grids.Existing mode is usually using multi-terminal HVDC transmission in parallel
Mode, direct current is switched to exchange by an inverter in each drop point, is connected to receiving end power grid.Multiple receiving end line commutations
The DC side parallel of device is connected to sending end inverter after getting up.For the mode of this multi-terminal HVDC transmission in parallel, each receiving end
The capacity of line commutation device is relatively small, but its DC voltage must be designed to the high rated direct voltage of entire route, lead
Cause the economics of inverter poor, operational safety degree is relatively low.
In fact, the mode of multiple drop points is sent to for the energy centre for concentrating electric energy from one, using series direct current
The mode of transmission of electricity will be more suitable for.Under series direct current power transmission mode, the voltage rating of each receiving end line commutation device only needs
It is designed as relatively low value, the DC side of each receiving end line commutation device, which is together in series, reaches the voltage water of DC power transmission line
It is flat.
Summary of the invention
The purpose of the present invention is to propose to a kind of DC transmission systems of the more drop points of mixing series connection, straight for existing multiterminal in parallel
The technical disadvantages such as power transmission mode receiving end line commutation device rated direct voltage is high, less economical, safety in operation is low are flowed, by straight
Concatenated mode is flowed, each receiving end line commutation device is linked together to be connected to after the voltage level for reaching DC power transmission line and is sent
Inverter is held, each receiving end line commutation device need to only use the modularization multi-level converter of relatively low pressure low capacity.Each
It is how electric using unidirectional current type modularization the characteristics of being irreversibly delivered for Hybrid HVDC power in receiving end line commutation device
Flat inverter realizes the power conversion of alternating current-direct current, to realize the receiving end line commutation device of low cost and densification.
The more drop point DC transmission systems of mixing series connection proposed by the present invention, including sending end AC network 101, a thyristor
Rectifier 102, DC line 103, multiple unidirectional current type full-bridge modules multilevel converters 104, multiple three-phase alternating currents become
Depressor 105 and multiple receiving end AC networks 106.The exchange of multiple unidirectional current type full-bridge modules multilevel converters 104 is defeated
Outlet is connected to multiple receiving end AC networks 106 by corresponding multiple three-phase ac transformers 105 respectively.Multiple unidirectional electricity
It is whole that the DC terminal of flow pattern full-bridge modules multilevel converter 104 by DC line is connected to thyristor after being sequentially connected in series
Flow the DC terminal of device 102；The exchange of silicon controlled rectifier 102 is terminated into sending end AC network.
The above-mentioned more drop point DC transmission systems of mixing series connection, the more level changes of current of unidirectional current type full-bridge modulesization therein
The structure of device is as shown in Fig. 2, each phase includes upper bridge arm and lower bridge arm, and each bridge arm is respectively by N number of identical unidirectional current type
Sub-module cascade is constituted, and the upper bridge arm lower end of each phase and lower bridge arm upper end respectively pass through an inductance L and link together, in inductance
Point becomes the ac input end of the phase, and the upper bridge arm upper end of all phases links together as direct current anode, the lower bridge of all phases
Arm lower end links together as direct current negative terminal.Unidirectional current type submodule therein, structure by first as shown in figure 3, opened
Close S1, second switch S2, first diode D1, the second diode D2, third diode D3, the 4th diode D4 and DC capacitor
C composition；The anode interconnection of the collector of first switch S1, the cathode of first diode D3, third diode D3
The first terminal T1 of unidirectional current type submodule is constituted afterwards；The sun of the emitter of the first switch S1, first diode D1
The cathode of pole, the anode of the 4th diode D4 and DC capacitor C is connected with each other；The collector of the second switch S2, second
The anode of the cathode of diode D2, the cathode of third diode D3 and DC capacitor C is connected with each other；The second switch S2's
The cathode of emitter, the anode of the second diode D2 and the 4th diode D4 is interconnected to constitute the of unidirectional current type submodule
Two-terminal T2.The structure of silicon controlled rectifier therein, as shown in figure 4, be made of two 6 pulse conversion devices (303 and 304),
12 pulsation rectifiers, connection transformer (301 Hes of two 6 pulse conversion devices are constituted by rectifier transformer (301 and 302)
302) 30 ° of secondary voltage phase phase difference；Two 6 pulse conversion devices (303 and 304) are made of six thyristors respectively.
The more drop point DC transmission systems of mixing series connection proposed by the present invention, its advantage is that:
The more drop point DC transmission systems of mixing series connection proposed by the present invention, sufficiently combine the respective advantage of LCC and MMC,
A high-voltage large-capacity silicon controlled rectifier is used in sending end power grid, is then connected using multiple modularization multi-level converters in receiving end
Connect multiple receiving end AC networks.Receiving end line commutation device is linked together by way of DC series, changes receiving end power grid
Stream device can be designed as lower voltage class, have better economy and safety in operation.The present invention is by conventional parallel connection
The more drop point DC transmission systems of multiterminal change into the series connection more drop point DC transmission systems of multiterminal, make each receiving end line commutation device can be with
Using lower DC voltage level, there is better economy and safety in operation.For remote large capacity mixed DC
The characteristics of transmission power irreversibly delivers, each receiving end line commutation device are real using unidirectional current type full-bridge modules multilevel converter
The power conversion of existing alternating current-direct current, makes that the cost of receiving end line commutation device is lower, densification degree is higher.
Detailed description of the invention
Fig. 1 is the more drop point DC transmission system structural schematic diagrams of mixing series connection of the invention.
Fig. 2 is the more level of unidirectional current type full-bridge modulesization in the more drop point DC transmission systems of mixing series connection shown in FIG. 1
The structural schematic diagram of inverter.
Fig. 3 is the unidirectional current type full-bridge submodule in unidirectional current type full-bridge modules multilevel converter shown in Fig. 2
The structural schematic diagram of block.
Fig. 4 is the structural schematic diagram of silicon controlled rectifier in unidirectional current type full-bridge submodule shown in Fig. 3.
Specific embodiment
The more drop point DC transmission systems of mixing series connection proposed by the present invention, structure is as shown in Figure 1, mixing series connection is fallen more
Point DC transmission system includes a sending end AC network 101, silicon controlled rectifier 102, DC line 103, multiple unidirectional electricity
Flow pattern full-bridge modules multilevel converter 104, multiple three-phase ac transformers 105 and multiple receiving end AC networks 106.It is multiple
The ac output end of unidirectional current type full-bridge modules multilevel converter 104 passes through corresponding multiple three-phase alternating currents respectively and becomes
Depressor 105 is connected to multiple receiving end AC networks 106.Multiple unidirectional current type full-bridge modules multilevel converters 104 it is straight
Stream end is connected to the DC terminal of silicon controlled rectifier 102 by DC line after being sequentially connected in series；Silicon controlled rectifier 102
Exchange is terminated into sending end AC network.
The above-mentioned more drop point DC transmission systems of mixing series connection, the more level changes of current of unidirectional current type full-bridge modulesization therein
The structure of device is as shown in Fig. 2, each phase includes upper bridge arm and lower bridge arm, and each bridge arm is respectively by N number of identical unidirectional current type
Sub-module cascade is constituted, and the upper bridge arm lower end of each phase and lower bridge arm upper end respectively pass through an inductance L and link together, in inductance
Point becomes the ac input end of the phase, and the upper bridge arm upper end of all phases links together as direct current anode, the lower bridge of all phases
Arm lower end links together as direct current negative terminal.Unidirectional current type submodule therein, structure by first as shown in figure 3, opened
Close S1, second switch S2, first diode D1, the second diode D2, third diode D3, the 4th diode D4 and DC capacitor
C composition；The anode interconnection of the collector of first switch S1, the cathode of first diode D3, third diode D3
The first terminal T1 of unidirectional current type submodule is constituted afterwards；The sun of the emitter of the first switch S1, first diode D1
The cathode of pole, the anode of the 4th diode D4 and DC capacitor C is connected with each other；The collector of the second switch S2, second
The anode of the cathode of diode D2, the cathode of third diode D3 and DC capacitor C is connected with each other；The second switch S2's
The cathode of emitter, the anode of the second diode D2 and the 4th diode D4 is interconnected to constitute the of unidirectional current type submodule
Two-terminal T2.The structure of silicon controlled rectifier therein, as shown in figure 4, be made of two 6 pulse conversion devices (303 and 304),
12 pulsation rectifiers, connection transformer (301 Hes of two 6 pulse conversion devices are constituted by rectifier transformer (301 and 302)
302) 30 ° of secondary voltage phase phase difference；Two 6 pulse conversion devices (303 and 304) are made of six thyristors respectively.
Below in conjunction with attached drawing, the working principle of the invention and the course of work is discussed in detail.As shown in Figure 1, each receiving end is handed over
Galvanic electricity net is connect with a unidirectional current type full-bridge modules multilevel converter respectively, each unidirectional current type full-bridge modules
The DC terminal of multilevel converter is connected in series, after the voltage rating for reaching DC power transmission line, with DC line phase
Connection.In order to further decrease the cost and volume of receiving end AC network inverter, as shown in Fig. 2, the receiving end electricity in the present invention
Net inverter uses the conversion that unidirectional current type full-bridge modules multilevel converter realizes alternating voltage and DC voltage.It adopts
When with unidirectional current type full-bridge modules multilevel converter, switching tube, every can be not being increased relative to semi-bridge type inverter
Under the premise of a submodule only increases the low capacity diode that two are only used for not controlling the charging stage, obtain that remove DC side temporary
The ability of property short trouble and from positive rated value to the direct voltage output ability of negative volume definite value, is also more suitable for remote large capacity
The unidirectional power transfer characteristic of Hybrid HVDC, what DC voltage needed for being also more suited for series direct current transmission of electricity was continuously adjusted
Characteristic.As shown in figure 3, setting the direct current in the submodule of unidirectional current type full-bridge modules multilevel converter on DC capacitor
Pressure is E, ensures that electric current is always from each submodule under the various operating statuses of inverter by the parameter designing and top level control of inverter
The first terminal t1 port of block flows into, the port Second terminal T2 is flowed out, and the control mode and voltage output state of submodule are as follows:
1) when switch S1 shutdown, S2 shutdown, the output voltage of submodule port is E；
2) when switch S1 conducting, S2 shutdown, the output voltage of submodule port is 0；
3) when switch S1 shutdown, S2 conducting, the output voltage of submodule port is 0；
4) when switch S1 conducting, S2 conducting, the output voltage of submodule port is-E；
As described above, the port of submodule can export three kinds of E, 0 ,-E voltage status.For by N number of submodule end
Mouthful T1 and T2 terminal successively cascade a bridge arm of composition, the voltage status of bridge arm can N × E ... 2E, E, 0 ,-
Change between E ...-N × E.Modularization multi-level converter includes U, V and W three-phase, and every phase is by two bridge arms and two inductance structures
Together with lower bridge arm upper end respectively passing through an inductance connection at, upper bridge arm lower end, outflow line, upper bridge are intersected in inductance midpoint thus
Arm upper end is the positive outlet of direct current, and lower bridge arm lower end is the negative outlet of direct current.By the output electricity for controlling the submodule port of each bridge arm
Pressure condition can be controlled separately exchange line voltage and direct current line voltage.
As shown in figure 4, in order to realize bigger voltage class and capacity, and cost is reduced, in sending end power grid using brilliant lock
Pipe rectifier.Silicon controlled rectifier is made of two 6 pulse conversion devices, constitutes 12 pulsation rectifiers by rectifier transformer；Its
In two 6 pulse conversion devices connection transformer 30 ° of secondary voltage phase phase difference；6 pulse conversion devices are by six thyristor structures
At.
The present invention uses the mixing of modularization multi-level converter straight in sending end using thyristor transverter, in receiving end power grid
The advantages of flowing power transmission mode, can sufficiently combining LCC and MMC.The present invention is by the conventional more drop point DC power transmission systems of multiterminal in parallel
System changes into the series connection more drop point DC transmission systems of multiterminal, allows each receiving end line commutation device using lower DC voltage etc.
Grade has better economy and safety in operation.The spy irreversibly delivered for remote large capacity Hybrid HVDC power
Point, each receiving end line commutation device realize the power conversion of alternating current-direct current using unidirectional current type full-bridge modules multilevel converter,
Make that the cost of receiving end line commutation device is lower, densification degree is higher.
Claims (4)
- A kind of more drop point DC transmission systems 1. mixing is connected, which is characterized in that the more drop point DC transmission systems of mixing series connection Including a sending end AC network (101), silicon controlled rectifier (102), DC line (103), multiple unidirectional current type full-bridges Modularization multi-level converter (104), multiple three-phase ac transformers (105) and multiple receiving end AC networks (106)；Described The ac output end of multiple unidirectional current type full-bridge modules multilevel converters (104) passes through corresponding multiple three-phases respectively AC transformer (105) is connected to multiple receiving end AC networks (106)；How electric multiple unidirectional current type full-bridge modulesization are The DC terminal of flat inverter (104) is connected to the direct current of silicon controlled rectifier (102) by DC line after being sequentially connected in series End；The exchange of silicon controlled rectifier (102) is terminated into sending end AC network.
- More drop point DC transmission systems 2. mixing as described in claim 1 is connected, it is characterised in that the wherein unidirectional electricity The structure of flow pattern full-bridge modules multilevel converter is as shown in Fig. 2, each phase includes upper bridge arm and lower bridge arm, each bridge arm point It is not made of N number of identical unidirectional current type sub-module cascade, the upper bridge arm lower end of each phase and lower bridge arm upper end respectively pass through one A inductance L links together, and inductance midpoint becomes the ac input end of the phase, and the upper bridge arm upper end of all phases is linked together into Lower bridge arm lower end for direct current anode, all phases links together as direct current negative terminal.
- More drop point DC transmission systems 3. mixing as claimed in claim 2 is connected, it is characterised in that the wherein unidirectional electricity Flow pattern submodule is by first switch S1, second switch S2, first diode D1, the second diode D2, third diode D3, the 4th Diode D4 and DC capacitor C composition；The collector of the first switch S1, the cathode of first diode D3, the three or two pole The anode of pipe D3 constitutes the first terminal T1 of unidirectional current type submodule after being connected with each other；The transmitting of the first switch S1 The cathode interconnection of pole, the anode of first diode D1, the anode of the 4th diode D4 and DC capacitor C；Described second The collector of switch S2, the cathode of the second diode D2, the cathode of third diode D3 are mutually interconnected with the positive of DC capacitor C It connects；The cathode of the emitter of the second switch S2, the anode of the second diode D2 and the 4th diode D4 is connected with each other structure At the Second terminal T2 of unidirectional current type submodule.
- More drop point DC transmission systems 4. mixing as claimed in claim 3 is connected, it is characterised in that the wherein thyristor Rectifier is made of two 6 pulse conversion devices (303 and 304), is constituted 12 pulsation by rectifier transformer (301 and 302) and is rectified Device, 30 ° of the secondary voltage phase phase difference of the connection transformer (301 and 302) of two 6 pulse conversion devices；Two 6 pulse conversion devices (303 and 304) are made of six thyristors respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910962667.2A CN110535166A (en) | 2019-10-11 | 2019-10-11 | A kind of more drop point DC transmission systems of mixing series connection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910962667.2A CN110535166A (en) | 2019-10-11 | 2019-10-11 | A kind of more drop point DC transmission systems of mixing series connection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112928943A (en) * | 2021-01-28 | 2021-06-08 | 东南大学 | Direct current side series connection alternating current side parallel connection type electric energy tapping device |
| CN113541516A (en) * | 2020-04-09 | 2021-10-22 | 中国长江三峡集团有限公司 | Unidirectional full-bridge modular multilevel converter based on IGCT (integrated gate commutated thyristor) and control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101479909A (en) * | 2006-06-28 | 2009-07-08 | Abb技术有限公司 | Modular HVDC converter |
| CN102841286A (en) * | 2012-08-07 | 2012-12-26 | 南京南瑞继保电气有限公司 | Method of judging reverse polarity of converter bridge control pulse cable |
| CN105634315A (en) * | 2016-02-22 | 2016-06-01 | 清华大学 | One-way current type modular multilevel converter |
| CN105846454A (en) * | 2016-04-27 | 2016-08-10 | 许继集团有限公司 | Three-terminal hybrid direct current transmission moving die test system |
-
2019
- 2019-10-11 CN CN201910962667.2A patent/CN110535166A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101479909A (en) * | 2006-06-28 | 2009-07-08 | Abb技术有限公司 | Modular HVDC converter |
| CN102841286A (en) * | 2012-08-07 | 2012-12-26 | 南京南瑞继保电气有限公司 | Method of judging reverse polarity of converter bridge control pulse cable |
| CN105634315A (en) * | 2016-02-22 | 2016-06-01 | 清华大学 | One-way current type modular multilevel converter |
| CN105846454A (en) * | 2016-04-27 | 2016-08-10 | 许继集团有限公司 | Three-terminal hybrid direct current transmission moving die test system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113541516A (en) * | 2020-04-09 | 2021-10-22 | 中国长江三峡集团有限公司 | Unidirectional full-bridge modular multilevel converter based on IGCT (integrated gate commutated thyristor) and control method |
| CN112928943A (en) * | 2021-01-28 | 2021-06-08 | 东南大学 | Direct current side series connection alternating current side parallel connection type electric energy tapping device |
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Application publication date: 20191203 |