CN116722579A - Land new energy big base direct current delivery system - Google Patents
Land new energy big base direct current delivery system Download PDFInfo
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- CN116722579A CN116722579A CN202311002640.1A CN202311002640A CN116722579A CN 116722579 A CN116722579 A CN 116722579A CN 202311002640 A CN202311002640 A CN 202311002640A CN 116722579 A CN116722579 A CN 116722579A
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- 238000004146 energy storage Methods 0.000 claims abstract description 38
- 238000010276 construction Methods 0.000 claims abstract description 28
- 239000002184 metal Substances 0.000 claims abstract description 5
- 230000007935 neutral effect Effects 0.000 claims abstract description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 10
- 238000005265 energy consumption Methods 0.000 claims description 8
- 238000010304 firing Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000006855 networking Effects 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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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
-
- 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02M7/145—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 thyratron or thyristor type requiring extinguishing means
- H02M7/155—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
-
- 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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/505—Conversion of dc power input into ac 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 thyratron or thyristor type requiring extinguishing means
- H02M7/515—Conversion of dc power input into ac 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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
-
- 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)
- Inverter Devices (AREA)
Abstract
The invention relates to the technical field of power engineering, and provides a land new energy large-base direct current delivery system. The system comprises: the system comprises a land power grid, a receiving end converter station, a direct current overhead line, a transmitting end converter station and a land new energy large base; the land power grid is connected with the receiving-end converter station; the receiving end converter station is connected with the transmitting end converter station through a direct current overhead line; the transmitting end converter station comprises a first thyristor valve, a second thyristor valve, an energy storage device-converter group, an auxiliary converter valve for network construction and an alternating current bus; the first thyristor valve and the second thyristor valve are connected in series on the direct current side; the first thyristor valve and the second thyristor valve are connected with the receiving-end converter station in a bipolar metal neutral line mode; the first thyristor valve, the second thyristor valve, the energy storage equipment-converter group and the auxiliary converter valve for networking are respectively connected with an alternating current bus; the transmitting end converter station is connected with a land new energy large base through an alternating current bus. The invention reduces the construction cost of the transmitting-end converter station and has the capability of clearing direct current faults.
Description
Technical Field
The invention relates to the technical field of power engineering, in particular to a land new energy large-base direct current delivery system.
Background
At present, if a direct current transmission system is adopted for external transmission of new land energy, under the condition that a network power supply is lacked at a transmission end, flexible direct current transmission is adopted for transmission, for example, zhang Bei four-terminal flexible direct current network engineering is adopted, compared with a thyristor valve, the flexible direct current valve has higher cost, and the pressure resistance and the current capacity are different from the thyristor valve; in addition, the land direct current transmission system generally adopts a direct current overhead line, the probability of transient direct current faults of the overhead line is very high, how to effectively pass through the direct current faults is also an important subject, an expensive direct current breaker is adopted in the north-opening four-terminal flexible direct current power grid project to realize direct current fault clearing and passing through, and a half-bridge and full-bridge mixed flexible direct current valve topological structure is adopted in the receiving end converter station in the Kun Liu Long project to realize direct current fault passing through.
In the schemes, on one hand, the cost of the soft direct current converter valve is higher, and on the other hand, if the direct current breaker scheme in the north opening engineering is adopted, the cost is further increased; if the soft direct current converter valve with the mixed half bridge and full bridge in the Kunzilong engineering is adopted, the equipment cost of the converter valve is increased.
Disclosure of Invention
The invention provides a land new energy large-base direct current outgoing system, which aims to reduce the construction cost of a land new energy large-base end-transmitting converter station and has direct current fault clearing capacity.
The system comprises: the system comprises a land power grid, a receiving end converter station, a direct current overhead line, a transmitting end converter station and a land new energy large base;
the land power grid is connected with the receiving-end converter station;
the receiving end converter station is connected with the transmitting end converter station through a direct current overhead line;
the transmitting end converter station comprises a first thyristor valve, a second thyristor valve, an energy storage device-converter group, an auxiliary converter valve for network construction and an alternating current bus; the first thyristor valve and the second thyristor valve are connected in series on the direct current side; the first thyristor valve and the second thyristor valve are connected with the receiving-end converter station in a bipolar metal neutral line mode; the first thyristor valve, the second thyristor valve, the energy storage equipment-converter group and the auxiliary converter valve for networking are respectively connected with an alternating current bus;
the transmitting end converter station is connected with a land new energy large base through an alternating current bus.
Through the system, when the direct current external transmission system normally operates, the thyristor valve in the transmitting end converter station is utilized to realize the rectification function of the direct current external transmission system, the flexible direct current converter valve in the related technology is replaced, the construction cost of the transmitting end converter station is reduced, and meanwhile, when the direct current overhead line in the direct current external transmission system fails, the transmitting end converter station can be converted into the inversion station from the rectification station through the thyristor, so that the direct current fault current is reduced rapidly.
In an alternative embodiment, the terminal converter station further comprises a first converter transformer and a second converter transformer;
the first thyristor valve is connected with an alternating current bus through a first converter transformer and a first circuit breaker in sequence;
the second thyristor valve is connected with the alternating current bus through a second converter transformer and a second circuit breaker in sequence.
In an alternative embodiment, the terminal converter station further comprises a first transformer; the energy storage device-converter group comprises an energy storage device and a converter; the energy storage device is connected with the alternating current bus through the converter, the third circuit breaker, the first transformer and the fourth circuit breaker in sequence.
In an alternative embodiment, the terminal converter station further comprises a second transformer; the auxiliary converter valve for the network construction is connected with the alternating current bus through a fifth circuit breaker, a second transformer and a sixth circuit breaker in sequence.
In an alternative embodiment, the energy storage device-converter set is used for establishing an alternating current bus voltage in a zero lifting voltage mode through alternating current voltage amplitude and frequency control, and charging is completed for the auxiliary converter valve for networking.
In an alternative embodiment, the energy storage device-converter set starts to charge the auxiliary converter valve for the grid construction in the process of zero lifting voltage, and transmits power to the first converter transformer, the second converter transformer and the second transformer, and after the energy storage device-converter set establishes the alternating current bus voltage, the auxiliary converter valve for the grid construction is continuously charged through alternating current voltage amplitude and frequency control until the auxiliary converter valve for the grid construction is charged.
In an alternative embodiment, the energy storage device-converter set is used for supporting the alternating current bus voltage together with the auxiliary converter valve for constructing the network by adopting alternating current voltage amplitude and frequency control after the auxiliary converter valve for constructing the network is charged, so as to start the land new energy large base; after the new land energy source is started on a large base and power is transmitted to the transmitting-end converter station, the new land energy source is switched to control the fixed active power and the fixed reactive power, and the new land energy source is used as an active filter of the transmitting-end converter station.
In an alternative embodiment, the auxiliary converter valve for network construction is used for adjusting the voltage of the alternating current bus through the amplitude and frequency control of the alternating current voltage after the charging is completed.
In an alternative embodiment, the terminal converter station is further configured to eliminate the dc fault current by adjusting the firing angle of the first thyristor valve and the firing angle of the second thyristor valve when the dc overhead line fails.
In an alternative embodiment, the land-based renewable energy base includes a plurality of land-based renewable energy units;
the auxiliary converter valve for the grid construction is also used for adjusting the voltage of the alternating current bus when the direct current overhead line fails, so that each land new energy unit senses the failure.
In an alternative embodiment, the land-based new energy unit includes an energy consumption device;
and the land new energy unit is used for starting the energy consumption device to consume surplus power after sensing the fault.
In an alternative embodiment, the first thyristor valve and the second thyristor valve are used for converting alternating current generated by the land new energy source large base into direct current after the land new energy source large base is started, and the direct current is conveyed to the receiving end converter station through the direct current overhead line;
and the receiving end converter station is used for converting the direct current into alternating current and transmitting the alternating current obtained by conversion to the land power grid.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a circuit diagram of a land-based new energy large-base dc delivery system according to an exemplary embodiment.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The invention provides a land new energy large-base direct current outgoing system, which aims to reduce the construction cost of a land new energy large-base end-transmitting converter station and has direct current fault clearing capacity.
Fig. 1 is a circuit diagram of a land-based new energy large-base dc delivery system according to an exemplary embodiment. The system comprises: the system comprises a land power grid 1, a receiving end converter station 2, a direct current overhead line 3, a transmitting end converter station 4 and a land new energy large base 5.
In an alternative embodiment, the receiving converter station 2 may select a variety of topologies, without specific limitation.
The land grid 1 is connected to a receiving converter station 2. The receiving-end converter station 2 is connected with the transmitting-end converter station 4 through a direct current overhead line 3.
The feed-end converter station 4 comprises a first thyristor valve 41, a second thyristor valve 42, an energy storage device-converter group 43, an auxiliary converter valve 44 for grid construction and an alternating current bus 45; the first thyristor valve 41 and the second thyristor valve 42 are connected in series on the direct current side; the first thyristor valve 41 and the second thyristor valve 42 are connected with the receiving-end converter station 2 in a bipolar metal neutral manner; the first thyristor valve 41, the second thyristor valve 42, the energy storage device-converter group 43, and the auxiliary converter valve 44 for grid formation are connected to an ac bus 45, respectively.
The terminal converter station 4 is connected with the land new energy large base 5 through an alternating current bus 45.
In an alternative embodiment, the land-based new energy large base 5 may be a wind farm or a photovoltaic farm, and is not particularly limited herein.
Through the system, when the direct current outgoing system normally operates, the thyristor valve in the sending end converter station 4 is utilized to realize the rectification function of the direct current outgoing system, the flexible direct current converter valve in the related technology is replaced, the construction cost of the sending end converter station is reduced, and meanwhile, when the direct current overhead line in the direct current outgoing system fails, the sending end converter station 4 can be converted into an inversion station from the rectification station through the thyristor, so that the direct current fault current is quickly reduced.
In fig. 1, the terminal converter station 4 further comprises a first converter transformer 46 and a second converter transformer 47.
The first thyristor valve 41 is connected to the ac bus 45 via a first converter transformer 46 and a first breaker 48 in this order.
The second thyristor valve 42 is connected to the ac bus 45 via a second converter transformer 47 and a second breaker 49 in sequence.
In an alternative embodiment, since the first thyristor valve 41 and the second thyristor valve 42 are connected with the receiving-end converter station 2 by the bipolar metal neutral line mode, when one of the first thyristor valve 41 and the second thyristor valve 42 fails, the second thyristor valve 42 can still transmit the electric energy generated in the land new energy large-base 5 to the receiving-end converter station 2, so that the normal operation of the land new energy large-base direct-current delivery system is ensured.
As shown in fig. 1, the transmitting converter station 4 further comprises a first transformer 410. The energy storage device-current transformer group 43 includes an energy storage device 431 and a current transformer 432; the energy storage device 431 is connected to the ac bus 45 through the converter 432, the third circuit breaker 411, the first transformer 410, and the fourth circuit breaker 412 in sequence.
The terminal converter station 4 further comprises a second transformer 413. The auxiliary converter valve 44 for network construction is connected to the ac bus 45 via a fifth breaker 414, a second transformer 413, and a sixth breaker 415 in this order.
In one example, the energy storage device-converter bank 43 is configured to establish an ac bus voltage with zero boost through ac voltage magnitude and frequency control to complete charging of the auxiliary converter valve 44 for grid formation.
In an alternative embodiment, the energy storage device-converter set 43 starts to transmit power to the first transformer during the zero lifting voltage, charges the capacitor in the auxiliary converter valve 44 for grid construction, transmits power to the first converter transformer 46, the second converter transformer 47 and the second transformer 413, and continues to charge the auxiliary converter valve 44 for grid construction through the amplitude and frequency control of the ac voltage after the ac bus voltage is established by the energy storage device-converter set 43 until the auxiliary converter valve 44 for grid construction is completely charged.
In an alternative embodiment, the energy storage device-converter set 43 is configured to use the ac voltage amplitude and frequency control and the auxiliary converter valve 44 for grid formation to support the ac bus voltage together after the auxiliary converter valve 44 for grid formation is charged, so as to start the land new energy large base 5; after the new land energy source large base 5 is started and transmits power to the transmitting end converter station 4, the control is switched to the control of fixed active power and fixed reactive power, and the control is used as an active filter of the transmitting end converter station 4.
In one example, the auxiliary converter valve 44 is used to regulate the ac bus voltage via ac voltage magnitude and frequency control after charging is complete.
In an example, the terminal converter station 4 is further configured to eliminate the dc fault current by adjusting the firing angle of the first thyristor valve 41 and the firing angle of the second thyristor valve 42 when the dc overhead line fails. Illustratively, the firing angle of the thyristor converter valve may be adjusted to 120 degrees to cause the rectifying station to become an inverting station, rapidly reducing the dc fault current.
In one example, the land-based renewable energy base 5 includes a plurality of land-based renewable energy units. When the land new energy large base 5 is a wind power plant, the land new energy unit is a wind power unit; when the land new energy large base 5 is a photovoltaic field station, the land new energy unit is photovoltaic power generation equipment.
The auxiliary converter valve 44 for network construction is also used for adjusting the voltage of the alternating current bus when the direct current overhead line fails, so that each land new energy unit senses the failure.
In one example, an onshore new energy unit includes energy consumption means.
And the land new energy unit is used for starting the energy consumption device to consume surplus power after sensing the fault.
The alternating current bus voltage is regulated through the auxiliary converter valve 44 for networking, so that the land new energy large base 5 senses abnormal working conditions, and the energy consumption device configured by the land new energy unit is started to dissipate surplus energy, thereby avoiding phenomena such as overvoltage and overcurrent.
In an example, the first thyristor valve 41 and the second thyristor valve 42 are used for converting the alternating current generated by the land new energy large base 5 into direct current after the land new energy large base is started, and the direct current is transmitted to the receiving end converter station 2 through the direct current overhead line 3;
the receiving end converter station 2 is used for converting direct current into alternating current and transmitting the converted alternating current to the land power grid 1.
In the system, a sending end converter station 4 is provided with a thyristor converter valve, and the power sent by a land new energy large base 5 is rectified by the thyristor valve and then is sent out in a direct current way; the energy storage device-converter group 43 (energy storage device and converter) is disposed in the terminal converter station 4, the energy storage device-converter group 43 is connected to an ac bus 45 of the terminal converter station 4 through an ac transformer, and an auxiliary converter valve 44 for network construction is disposed in the terminal converter station 4.
The primary functions of the energy storage device-converter group 43 are: firstly, the boost is zero in the starting stage, and the capacitor contained in the auxiliary converter valve 44 for networking is charged; secondly, establishing an alternating current bus voltage of the transmitting end converter station 4 in a starting stage, and providing voltage support for the land new energy large base 5; thirdly, providing energy support for the power distribution equipment in the part of the transmitting end converter station 4 and the land new energy large base 5 in the starting stage; and fourthly, the active filter can be used as an active filter of the transmitting-end converter station 4 in normal operation after starting, so that the configuration and occupation of the passive filter of the transmitting-end converter station 4 are reduced.
After the electric equipment is started in part of the land new energy large base 5, the voltage supporting function of the energy storage equipment-converter group 43 is replaced by the auxiliary converter valve 44 for network construction, and the auxiliary converter valve 44 for network construction establishes the alternating current bus voltage of the transmitting end converter station 4 by adopting alternating current voltage amplitude and frequency control (V/F control) on one hand and provides part of reactive compensation for the transmitting end converter station 4 on the other hand.
The following describes the operation of a terrestrial new energy large-base direct current delivery system by means of specific examples.
Example 1
The start of the transmitting-end converter station and the land new energy large base is realized by the following contents:
step a1: closing a first circuit breaker, a second circuit breaker, a third circuit breaker, a fourth circuit breaker, a fifth circuit breaker and a sixth circuit breaker, wherein the grid-side converter of the energy storage equipment-converter group is boosted in a zero-start manner and establishes an alternating current bus voltage as a rated voltage by adopting V/F control; on the one hand, excitation is provided for the transformer, and on the other hand, the auxiliary converter valve for networking is charged.
Step a2: after the auxiliary converter valve for networking is charged, the auxiliary converter valve is controlled by V/F, and supports the voltage of an alternating current bus together with the energy storage equipment-converter group so as to start part of fans in the land new energy big base.
Step a3: after the new land energy source is started on a large basis and power is transmitted to the transmitting-end converter station, the energy storage equipment-converter group is switched into fixed active power and fixed reactive power control (P/Q control) by V/F control. The energy storage equipment-converter group does not need to provide active power at this time, is mainly used as an active filter of the transmitting-end converter station, and can also provide partial reactive compensation for the transmitting-end converter station.
The auxiliary converter valve for network construction regulates the voltage of an alternating current bus (PCC voltage) to ensure that the active power of a land new energy large base is sent out from the thyristor valve, and the direct current voltage of the auxiliary converter valve for network construction is kept stable, and reactive compensation is provided.
Example 2
When the direct current overhead line fails, the direct current fault ride-through is realized through the following contents:
when a direct current overhead line ground fault occurs, the sending end converter station controls the trigger angle of the thyristor converter valve to be quickly adjusted to 120 degrees on one hand, so that the rectifier station becomes an inversion station, and the direct current fault current is quickly reduced; on one hand, PCC voltage is regulated through an auxiliary converter valve for networking, so that an onshore new energy base senses abnormal working conditions, and an energy consumption device configured by the new energy unit is started to dissipate surplus energy, thereby avoiding phenomena such as overvoltage and overcurrent.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The foregoing is merely exemplary of embodiments of the present invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. A land-based new energy large-base direct current delivery system, the system comprising: the system comprises a land power grid, a receiving end converter station, a direct current overhead line, a transmitting end converter station and a land new energy large base;
the land power grid is connected with the receiving-end converter station;
the receiving end converter station is connected with the transmitting end converter station through the direct current overhead line;
the feed end converter station comprises a first thyristor valve, a second thyristor valve, an energy storage equipment-converter group, an auxiliary converter valve for network construction and an alternating current bus; the first thyristor valve and the second thyristor valve are connected in series on the direct current side; the first thyristor valve and the second thyristor valve are connected with the receiving-end converter station in a bipolar metal neutral line mode; the first thyristor valve, the second thyristor valve, the energy storage equipment-converter group and the auxiliary converter valve for network construction are respectively connected with the alternating current bus;
the transmitting end converter station is connected with the land new energy large base through the alternating current bus.
2. The system of claim 1, wherein the terminal converter station further comprises a first converter transformer and a second converter transformer;
the first thyristor valve is connected with the alternating current bus through the first converter transformer and the first circuit breaker in sequence;
the second thyristor valve is connected with the alternating current bus through the second converter transformer and the second circuit breaker in sequence.
3. The system of claim 2, wherein the terminal converter station further comprises a first transformer; the energy storage device-converter group comprises an energy storage device and a converter; the energy storage equipment is connected with the alternating current bus through the converter, the third circuit breaker, the first transformer and the fourth circuit breaker in sequence.
4. A system according to claim 3, wherein the terminal converter station further comprises a second transformer; the auxiliary converter valve for the grid construction is connected with the alternating current bus through a fifth circuit breaker, the second transformer and the sixth circuit breaker in sequence.
5. The system of claim 4, wherein the energy storage device-converter set is configured to establish an ac bus voltage with zero boost by ac voltage magnitude and frequency control to complete charging of the auxiliary converter valve for grid formation.
6. The system of claim 5, wherein the energy storage device-converter bank begins charging the auxiliary converter valve for grid formation during a zero lift voltage and delivering power to the first converter transformer, the second converter transformer, and the auxiliary converter valve for grid formation continues to be charged through ac voltage amplitude and frequency control after the energy storage device-converter bank establishes the ac bus voltage until the auxiliary converter valve for grid formation is charged.
7. The system of claim 6, wherein the energy storage device-converter set is configured to support an ac bus voltage with the auxiliary converter valve for grid formation using ac voltage amplitude and frequency control to start the land-based new energy base after the auxiliary converter valve for grid formation is charged; and after the land new energy is started on a large base and power is transmitted to the transmitting-end converter station, switching to control of fixed active power and fixed reactive power to serve as an active filter of the transmitting-end converter station.
8. The system of claim 6, wherein the auxiliary converter valve is configured to regulate the ac bus voltage by ac voltage amplitude and frequency control after charging is complete.
9. The system of claim 1, wherein the terminal converter station is further configured to eliminate dc fault current by adjusting the firing angle of the first thyristor valve and the firing angle of the second thyristor valve when the dc overhead line fails.
10. The system of claim 5, wherein the land-based renewable energy base comprises a plurality of land-based renewable energy units;
the auxiliary converter valve for the grid construction is further used for adjusting the voltage of the alternating current bus when the direct current overhead line fails, so that each land new energy unit senses the failure.
11. The system of claim 10, wherein the land-based new energy unit comprises an energy consumption device;
and the land new energy unit is used for starting the energy consumption device to consume surplus power after sensing faults.
12. The system of claim 1, wherein the first thyristor valve and the second thyristor valve are configured to convert alternating current generated by the land-based renewable energy source to direct current after the land-based renewable energy source is started, and to transmit the direct current to the receiving-side converter station through the direct current overhead line;
the receiving end converter station is used for converting the direct current into alternating current and transmitting the alternating current obtained through conversion to the land power grid.
Priority Applications (1)
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Citations (4)
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|---|---|---|---|---|
| US4638415A (en) * | 1984-03-01 | 1987-01-20 | Siemens Aktiengesellschaft | Method and apparatus for resumption of normal operation of a high-voltage D. C. transmission line |
| CN108448542A (en) * | 2018-02-07 | 2018-08-24 | 许继集团有限公司 | Sub-modular structure with alternating current-direct current fault clearance ability and MMC topological structures |
| CN116054221A (en) * | 2023-01-05 | 2023-05-02 | 中国长江三峡集团有限公司 | Offshore wind power hybrid direct current sending-out system and starting method |
| CN116231721A (en) * | 2023-05-09 | 2023-06-06 | 长江三峡集团实业发展(北京)有限公司 | Offshore wind power direct current sending-out system based on-shore high-low valve and control method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4638415A (en) * | 1984-03-01 | 1987-01-20 | Siemens Aktiengesellschaft | Method and apparatus for resumption of normal operation of a high-voltage D. C. transmission line |
| CN108448542A (en) * | 2018-02-07 | 2018-08-24 | 许继集团有限公司 | Sub-modular structure with alternating current-direct current fault clearance ability and MMC topological structures |
| CN116054221A (en) * | 2023-01-05 | 2023-05-02 | 中国长江三峡集团有限公司 | Offshore wind power hybrid direct current sending-out system and starting method |
| CN116231721A (en) * | 2023-05-09 | 2023-06-06 | 长江三峡集团实业发展(北京)有限公司 | Offshore wind power direct current sending-out system based on-shore high-low valve and control method |
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