CN106936154A - Start method for the grid-connected series-parallel connection direct current network of extensive remote offshore wind farm - Google Patents
Start method for the grid-connected series-parallel connection direct current network of extensive remote offshore wind farm Download PDFInfo
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- CN106936154A CN106936154A CN201511019298.1A CN201511019298A CN106936154A CN 106936154 A CN106936154 A CN 106936154A CN 201511019298 A CN201511019298 A CN 201511019298A CN 106936154 A CN106936154 A CN 106936154A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000005684 electric field Effects 0.000 claims abstract description 14
- 230000009183 running Effects 0.000 claims abstract description 8
- 230000005611 electricity Effects 0.000 claims description 17
- 238000004804 winding Methods 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000011217 control strategy Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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- H02J3/386—
-
- 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
-
- 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
-
- 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]
Abstract
Start method, including step 1 the invention provides a kind of series-parallel connection direct current network grid-connected for extensive remote offshore wind farm：Control LCC transverters charge to VSC transverters；Step 2：The wind power generating set of marine wind electric field is incorporated to by platform；Step 3：After control LCC transverters work in inverter mode, with VSC transverter parallel runnings.Compared with prior art, a kind of series-parallel connection direct current network grid-connected for extensive remote offshore wind farm that the present invention is provided starts method, simple and easy to apply, good economy performance, it is not necessary to the small-sized AC starting power supply of remote marine wind electric field side.
Description
Technical field
The present invention relates to technical field of direct current power transmission, and in particular to a kind of straight for the grid-connected series-parallel connection of extensive remote offshore wind farm
Stream power network starts method.
Background technology
At present, LCC-HVDC is in occasions such as the back-to-back interconnections of submarine cable power transmission, Large Copacity long distance power transmission and asynchronous power network
It is used widely, but there is Inverter Station may occur commutation failure, weak AC system cannot be powered, needed in running
The defects such as a large amount of reactive powers are consumed, its further development is constrained.Voltage source converter based on all-controlling power electronics device
Device D.C. high voltage transmission (VSC-HVDC) have can independent control active reactive power, in the absence of commutation failure, can be passive
The advantages of island with power, but system cost is expensive, cannot effectively process DC Line Fault.In order to reasonably utilize
The advantage of LCC-HVDC and VSC-HVDC systems, one end uses LCC, and one end uses the series-parallel connection DC transmission system of VSC
It is suggested, as shown in Figure 1.Rectification side is applied to extensive using VSC, inverter side using the series-parallel connection DC transmission system of LCC
Remote offshore wind farm is grid-connected.Hybrid HVDC system is rectification side into needing before steady-state operation one to start control process
The electric capacity of VSC transverters charges, to prevent start-up course from producing overvoltage overcurrent harm current converter safety, it is necessary to start
Process Design reasonably starts control strategy.
Due to other species power supplys beyond the typically no wind-powered electricity generation of marine wind electric field, at present to for extensive remote offshore wind farm
Main the taking of the startup method of grid-connected series-parallel connection direct current network sets small-sized AC starting power supply (such as diesel generation in wind farm side
Machine) method one rectification side alternating voltage of stabilization is provided, VSC transverter in auxiliary rectifier side starts, and start-up course completes system
Unite and again exit small-sized AC starting power supply into after stable operation.But the cost of this method, maintenance cost are all higher.
Accordingly, it is desirable to provide a kind of simple and easy to apply, good economy performance, it is not necessary to the small-sized AC starting of remote marine wind electric field side
The series-parallel connection direct current network that the extensive remote offshore wind farm of power supply is grid-connected starts method.
The content of the invention
The need in order to meet prior art, the invention provides a kind of straight for the grid-connected series-parallel connection of extensive remote offshore wind farm
Stream power network starts method.
The technical scheme is that：
The series-parallel connection direct current network includes VSC transverters and LCC transverters；The VSC transverters access marine wind electric field,
The LCC transverters access land AC system, and VSC transverters are connected with LCC transverters by subsea DC cable, institute
The method of stating includes：
Step 1：The LCC transverters are controlled to be charged to VSC transverters；
Step 2：The wind power generating set of the marine wind electric field is incorporated to by platform；
Step 3：After controlling the LCC transverters to work in inverter mode, with VSC transverter parallel runnings.
Preferably, LCC transverters include that locking charge mode and half locking are charged to the charging of VSC transverters in the step 1
Pattern.
Preferably, the locking charge mode：
Step 111：The LCC transverters are controlled to work in rectification state, the breaker at closure subsea DC cable two ends；
Step 112：Control the voltage instruction V of the LCC transvertersdc1refThe slow linear increase since 0；
Step 113：The DC current of the LCC transverters output is filled by the diode of VSC transverter Neutron modules to electric capacity
Electricity；
After the locking charge mode terminates, the capacitance voltage of each submodule is
Wherein, Vdc1NIt is DC voltage rated value, NsmIt is the submodule number included per phase bridge arm in VSC transverters.
Preferably, the half locking charge mode：
Step 121：The submodule number n that input is needed in the VSC transverters is calculated,Wherein VmFor
AC line voltage peak value.
Step 122：Capacitor voltage equalizing control is carried out to VSC transverters, the electric capacity for ensureing VSC transverter Neutron modules continues
Charge；
After the half locking charge mode terminates, the capacitance voltage of each submodule is
Wherein, Vdc1NIt is DC voltage rated value, NsmIt is the submodule number included per phase bridge arm in VSC transverters.
Preferably, the stator winding of wind power generating set accesses wind-powered electricity generation field output transformer by the first breaker in the step 2,
It is defeated that rotor windings pass sequentially through the 3rd breaker, rotor side converter, grid side converter and the second breaker the access wind power plant
Go out transformer；The wind-powered electricity generation field output transformer is connected by the 4th breaker with the VSC transverters.
Preferably, the wind power generating set of marine wind electric field is incorporated in the step 2 by platform：
Step 21：The 4th breaker is closed, the VSC is accessed into wind-powered electricity generation field output transformer；
Step 22：The second breaker and the 3rd breaker are closed successively；
Step 23：As the upper grid entry point voltage U of output voltage tracking of the stator windingsWhen, close the first breaker.
Preferably, after controlling LCC transverters to work in inverter mode in the step 3, with VSC transverter parallel runnings：
Step 31：Disconnect the breaker at subsea DC cable two ends；
Step 32：The LCC transverters are switched into inverter mode；
Step 33：Gather the DC voltage V of the VSC transvertersdc2, control the DC voltage of the LCC transverters
Vdc1=Vdc2Afterwards, the breaker is closed.
Compared with immediate prior art, excellent effect of the invention is：
1st, a kind of series-parallel connection direct current network grid-connected for extensive remote offshore wind farm that the present invention is provided starts method, can save
Wind farm side is removed for the small-sized AC starting power supply (such as diesel-driven generator) of assistant starting, it is cost-effective；
2nd, a kind of series-parallel connection direct current network grid-connected for extensive remote offshore wind farm that the present invention is provided starts method, its control
Control method during by steady-state operation simplifies or blocks some functions and obtains, it is not necessary to for start-up course individually writes control program.
Brief description of the drawings
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1：A kind of series-parallel connection direct current network grid-connected for extensive remote offshore wind farm starts method flow in the embodiment of the present invention
Figure；
Fig. 2：The grid-connected series-parallel connection direct current network structural representation of extensive remote offshore wind farm in the embodiment of the present invention；
Fig. 3：VSC transverters topological structure schematic diagram in the embodiment of the present invention；
Fig. 4：LCC transverters topological structure schematic diagram in the embodiment of the present invention；
Fig. 5：Locking charging schematic diagram in the embodiment of the present invention；
Fig. 6：The grid-connected simplified wiring diagram of Wind turbines in the embodiment of the present invention.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein it is identical from start to finish or
Similar label represents same or similar element or the element with same or like function.Below with reference to Description of Drawings
Embodiment is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
The implementation that a kind of series-parallel connection direct current network grid-connected for extensive remote offshore wind farm that the present invention is provided starts method is for example
Shown in Fig. 1, the structure of the series-parallel connection direct current network is as shown in Fig. 2 including VSC transverters and LCC transverters；The VSC changes of current
Device accesses marine wind electric field, and LCC transverters access land AC system, and VSC transverters are straight by seabed with LCC transverters
Stream cable connection.Concretely comprise the following steps,
First, control LCC transverters charge to VSC transverters.
LCC transverters charge to VSC transverters in the present embodiment includes locking charge mode and half locking charge mode.
1st, locking charge mode, as shown in Figure 5：
(1) control LCC transverters work in rectification state, the breaker at closure subsea DC cable two ends.
(2) the voltage instruction V of LCC transverters is controlleddc1refThe slow linear increase since 0.
(3) DC current of LCC transverters output is charged by the diode of VSC transverter Neutron modules to electric capacity.
In the present embodiment, after locking charge mode terminates, the capacitance voltage of each submodule is
Wherein, Vdc1NIt is DC voltage rated value, NsmIt is the submodule number included per phase bridge arm in VSC transverters.
2nd, half locking charge mode：
(1) the submodule number n of input is needed in calculating VSC transverters,
Wherein, VmIt is AC line voltage peak value.
(2) capacitor voltage equalizing control is carried out to VSC transverters.
Capacitor voltage equalizing control strategy includes in the present embodiment：
①：During input submodule, capacitance voltage is minimum during selection does not put into submodule, is put into；
②：During excision submodule, selection has put into capacitance voltage highest in submodule, is cut off；
③：Capacitance voltage soprano is put into submodule than not putting into capacitance voltage the lowest voltage Δ u high in submodule, then will
Capacitance voltage soprano excision in submodule is put into, capacitance voltage the lowest input in submodule will not put into.Δ u is submodule
The maximum deviation allowed between capacitance voltage soprano and submodule capacitor voltage the lowest.
④：If having put into submodule voltage more than Vmax, then cut off, find out and do not put into capacitance voltage the lowest in submodule
Input.VmaxIt is the maximum of submodule capacitor voltage.
⑤：Whether the submodule number of periodic detection needs input and the submodule number for having put into are identical, need to throw if difference
Enter or cut off certain amount submodule and cause that the two is consistent.
Capacitor voltage equalizing is controlled, and the electric capacity for ensureing VSC transverter Neutron modules persistently charges；The capacitance voltage of all submodules
ForWhen, charging process terminates, i.e., in the present embodiment, after half locking charge mode terminates, and the electric capacity electricity of each submodule
Press and beWherein, Vdc1NIt is DC voltage rated value, NsmIt is the submodule number included per phase bridge arm in VSC transverters.
2nd, the wind power generating set of marine wind electric field is incorporated to by platform.
In the embodiment of the present invention, as shown in Figure 6：
The stator winding of wind power generating set accesses wind-powered electricity generation field output transformer by the first breaker；Rotor windings pass sequentially through
Three breakers, rotor side converter, grid side converter and the second breaker access wind-powered electricity generation field output transformer；
Wind-powered electricity generation field output transformer is connected by the 4th breaker with VSC transverters.
The wind power generating set for being incorporated to marine wind electric field in the embodiment of the present invention by platform is no longer：
1st, the 4th breaker is closed, VSC is accessed into wind-powered electricity generation field output transformer, set up reference voltage.
2nd, the second breaker and the 3rd breaker are closed successively, and the DC capacitor voltage and stator winding that Wind turbines are set up respectively are defeated
Go out voltage.
3rd, as the upper grid entry point voltage U of output voltage tracking of stator windingsWhen, the first breaker is closed, realize minimal impact electricity
Flow down the smooth grid-connected of Wind turbines.
According to step 1-3 that wind power generating set is grid-connected by platform, the now lateral land AC system output of Wind turbines stator is active
Power is 0.
3rd, after control LCC transverters work in inverter mode, with VSC transverter parallel runnings.
After LCC transverters work in inverter mode in the present embodiment, with concretely comprising the following steps for VSC transverter parallel runnings：
1st, the breaker at subsea DC cable two ends is disconnected.
2nd, LCC transverters are switched into inverter mode.
3rd, the DC voltage V of VSC transverters is gathereddc2, control the DC voltage V of LCC transvertersdc1=Vdc2Afterwards, close
Breaker, so as to complete series-parallel connection direct current network start-up course, next step can be sent marine wind electric field using series-parallel connection direct current network
Power transmission to land AC network.
Finally it should be noted that：Described embodiment is only some embodiments of the present application, rather than whole embodiments.
Based on the embodiment in the application, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its
His embodiment, belongs to the scope of the application protection.
Claims (7)
1. a kind of series-parallel connection direct current network grid-connected for extensive remote offshore wind farm starts method, the series-parallel connection direct current network bag
Include VSC transverters and LCC transverters；The VSC transverters access marine wind electric field, and the LCC transverters access land
Ground AC system, VSC transverters are connected with LCC transverters by subsea DC cable, it is characterised in that methods described includes：
Step 1：The LCC transverters are controlled to be charged to VSC transverters；
Step 2：The wind power generating set of the marine wind electric field is incorporated to by platform；
Step 3：After controlling the LCC transverters to work in inverter mode, with VSC transverter parallel runnings.
2. the method for claim 1, it is characterised in that LCC transverters fill to VSC transverters in the step 1
Electricity includes locking charge mode and half locking charge mode.
3. method as claimed in claim 2, it is characterised in that the locking charge mode：
Step 111：The LCC transverters are controlled to work in rectification state, the breaker at closure subsea DC cable two ends；
Step 112：Control the voltage instruction V of the LCC transvertersdc1refThe slow linear increase since 0；
Step 113：The DC current of the LCC transverters output is filled by the diode of VSC transverter Neutron modules to electric capacity
Electricity；
After the locking charge mode terminates, the capacitance voltage of each submodule is
Wherein, Vdc1NIt is DC voltage rated value, NsmIt is the submodule number included per phase bridge arm in VSC transverters.
4. method as claimed in claim 2, it is characterised in that the half locking charge mode：
Step 121：The submodule number n that input is needed in the VSC transverters is calculated,Wherein VmFor
AC line voltage peak value.
Step 122：Capacitor voltage equalizing control is carried out to VSC transverters, the electric capacity for ensureing VSC transverter Neutron modules continues
Charge；
After the half locking charge mode terminates, the capacitance voltage of each submodule is
Wherein, Vdc1NIt is DC voltage rated value, NsmIt is the submodule number included per phase bridge arm in VSC transverters.
5. the method for claim 1, it is characterised in that the stator winding of wind power generating set passes through in the step 2
First breaker accesses wind-powered electricity generation field output transformer, and rotor windings pass sequentially through the 3rd breaker, rotor side converter, net side and become
Parallel operation and the second breaker access the wind-powered electricity generation field output transformer；The wind-powered electricity generation field output transformer passes through the 4th breaker and institute
State the connection of VSC transverters.
6. method as claimed in claim 5, it is characterised in that be incorporated to the wind-force hair of marine wind electric field in the step 2 by platform
Group of motors：
Step 21：The 4th breaker is closed, the VSC is accessed into wind-powered electricity generation field output transformer；
Step 22：The second breaker and the 3rd breaker are closed successively；
Step 23：As the upper grid entry point voltage U of output voltage tracking of the stator windingsWhen, close the first breaker.
7. the method for claim 1, it is characterised in that control LCC transverters to work in inversion in the step 3
After state, with VSC transverter parallel runnings：
Step 31：Disconnect the breaker at subsea DC cable two ends；
Step 32：The LCC transverters are switched into inverter mode；
Step 33：Gather the DC voltage V of the VSC transvertersdc2, control the DC voltage of the LCC transverters
Vdc1=Vdc2Afterwards, the breaker is closed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201511019298.1A CN106936154B (en) | 2015-12-29 | 2015-12-29 | Series-parallel direct-current power grid starting method for large-scale long-distance offshore wind power grid connection |
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| CN201511019298.1A CN106936154B (en) | 2015-12-29 | 2015-12-29 | Series-parallel direct-current power grid starting method for large-scale long-distance offshore wind power grid connection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110086198A (en) * | 2019-04-23 | 2019-08-02 | 湖北工业大学 | A kind of multiterminal Hybrid HVDC system grid-connected suitable for offshore wind farm and starting control method |
| CN111541259A (en) * | 2020-04-23 | 2020-08-14 | 南方电网科学研究院有限责任公司 | Charging control method, device and medium for hybrid multi-terminal direct current transmission system |
| CN113612376A (en) * | 2021-07-02 | 2021-11-05 | 广东电网有限责任公司阳江供电局 | Starting method of offshore wind power direct current sending-out system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110086198A (en) * | 2019-04-23 | 2019-08-02 | 湖北工业大学 | A kind of multiterminal Hybrid HVDC system grid-connected suitable for offshore wind farm and starting control method |
| CN110086198B (en) * | 2019-04-23 | 2022-08-16 | 湖北工业大学 | Multi-terminal hybrid direct-current power transmission system control method for offshore wind power grid connection |
| CN111541259A (en) * | 2020-04-23 | 2020-08-14 | 南方电网科学研究院有限责任公司 | Charging control method, device and medium for hybrid multi-terminal direct current transmission system |
| CN111541259B (en) * | 2020-04-23 | 2021-07-30 | 南方电网科学研究院有限责任公司 | Charging control method, device and medium for hybrid multi-terminal direct current transmission system |
| CN113612376A (en) * | 2021-07-02 | 2021-11-05 | 广东电网有限责任公司阳江供电局 | Starting method of offshore wind power direct current sending-out system |
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