CN113612377B - Starting method of offshore wind power direct current sending-out system - Google Patents
Starting method of offshore wind power direct current sending-out system Download PDFInfo
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- CN113612377B CN113612377B CN202110752626.8A CN202110752626A CN113612377B CN 113612377 B CN113612377 B CN 113612377B CN 202110752626 A CN202110752626 A CN 202110752626A CN 113612377 B CN113612377 B CN 113612377B
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000011217 control strategy Methods 0.000 claims abstract description 11
- 238000005265 energy consumption Methods 0.000 claims abstract description 9
- 238000010304 firing Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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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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- 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
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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
- 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
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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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)
- Control Of Eletrric Generators (AREA)
Abstract
The invention provides a starting method of an offshore wind power direct current sending-out system, which comprises the following steps: firstly, charging the offshore flexible direct current converter valve and the onshore flexible direct current converter valve through a starting resistor of the onshore converter station, and then starting an offshore generator; the energy consumption device of the onshore converter station controls the voltage of a direct current side to be a preset voltage, unlocks the offshore flexible direct current converter valve, merges the offshore flexible direct current converter valve into the offshore generator, then starts the fans of the offshore wind farm one by one based on the running state of the offshore generator, and stops starting the fans when detecting that the power of the fans is larger than the power consumed by the offshore converter station; then, the offshore generator stops running, and meanwhile, the offshore flexible direct current converter valve is switched to an alternating current voltage closed-loop control strategy; and finally, unlocking the offshore conventional direct current converter valve and the onshore flexible direct current converter valve, so that a starting method of the offshore wind power delivery system can be provided, and the reliability and the stability in the starting process are improved.
Description
Technical Field
The invention relates to the technical field of offshore wind power direct current sending, in particular to a starting method of an offshore wind power direct current sending system.
Background
The common flexible direct current sending topology of offshore wind power adopts a full-power flexible direct current topology at both ends, and is a mature solution in the industry. The offshore platform has larger volume and weight and higher cost.
In order to reduce the volume and the weight of an offshore converter station, a scholars puts forward that an offshore flexible direct current converter valve is replaced by a diode converter valve, but an offshore wind turbine needs to be transformed into a network construction type control strategy, and the method is a great change of the existing industrial system. The compromise scheme is that diode converter valves and flexible direct current converter valves are connected in series at sea, the volume and weight can be reduced to a certain degree without changing a fan control strategy, and the novel topology is as shown in figure 1.
However, in the implementation of the above process, the applicant has found that since the diode/thyristor has no reverse current flow capability, it cannot be charged by the onshore station network offshore station, and only unidirectional transmission of power can be realized. When the fan is completely shut down, the onshore power supply cannot be used for supplying power to the offshore converter station, and the onshore power supply cannot be used as a starting power supply of the offshore fan. The new topology, while it may reduce the bulk weight of the offshore converter station, has the problem of difficult start-up.
Disclosure of Invention
The invention provides a starting method of an offshore wind power direct current sending-out system, which aims to solve the problem that the offshore wind power sending-out system is difficult to start.
The invention provides a starting method of an offshore wind power direct current sending-out system, wherein the offshore wind power direct current sending-out system comprises an offshore converter station and a onshore converter station, the offshore converter station comprises an offshore flexible direct current converter valve and an offshore conventional direct current converter valve, the offshore flexible direct current converter valve and the offshore conventional direct current converter valve are connected in series, and the onshore converter station comprises an onshore flexible direct current converter valve;
the starting method comprises the following steps:
charging the offshore flexible direct current converter valve and the onshore flexible direct current converter valve through a starting resistor of the onshore converter station, and then starting an offshore generator;
the energy consumption device of the onshore converter station controls the voltage of the direct current side to be a preset voltage;
unlocking the offshore flexible direct current converter valve and incorporating the offshore flexible direct current converter valve into an offshore generator;
starting the fans of the offshore wind farm one by one based on the running state of the offshore generator, and stopping starting the fans when detecting that the power of the fans is greater than the power consumed by the offshore converter station;
the offshore generator quits operation, and synchronously the offshore flexible direct current converter valve is switched to an alternating current voltage closed-loop control strategy;
unlocking the offshore conventional direct current converter valve, and controlling the offshore conventional direct current converter valve to gradually increase the direct current voltage to the direct current rated voltage of the onshore flexible direct current converter valve;
unlocking the onshore flexible direct current converter valve.
Preferably, the preset voltage is a rated direct-current voltage of the offshore flexible direct-current converter valve.
Preferably, the unlocking of the offshore flexible direct current converter valve specifically comprises:
and the marine flexible direct current converter valve is unlocked through a direct current voltage outer ring control strategy.
Preferably, the unlocking the offshore conventional direct current converter valve specifically comprises:
the offshore flexible direct current converter valve controls the alternating voltage of the offshore flexible direct current converter valve to be reduced to 0, controls the state of the alternating voltage of the offshore flexible direct current converter valve to be 0, maintains the state for a first preset time, and then gradually raises the alternating voltage of the offshore flexible direct current converter valve to the alternating current rated voltage of the offshore flexible direct current converter valve within a second preset time; when the alternating current voltage of the offshore flexible direct current converter valve is detected to be reduced to 0, a transformer of the offshore conventional direct current converter valve is unlocked;
and unlocking the offshore conventional direct current converter valve.
Preferably, the control of the offshore conventional dc converter valve gradually increases the dc voltage to the dc rated voltage of the onshore flexible dc converter valve, specifically:
and controlling the offshore conventional direct current converter valve to gradually increase the direct current voltage to the direct current rated voltage of the onshore flexible direct current converter valve by adjusting the firing angle of the offshore conventional direct current converter valve.
Compared with the prior art, the starting method of the offshore wind power direct current sending-out system provided by the invention has the following beneficial effects: the method for starting the offshore wind power direct current sending-out system comprises the steps of firstly charging an offshore flexible direct current converter valve and the onshore flexible direct current converter valve through a starting resistor of the onshore converter station, then starting an offshore generator, controlling direct current side voltage to be preset voltage by an energy consumption device of the onshore converter station, unlocking the offshore flexible direct current converter valve, merging the offshore flexible direct current converter valve into the offshore generator, then starting fans of an offshore wind power plant one by one based on the running state of the offshore generator, and stopping starting the fans when detecting that the power of the fans is larger than the power consumed by the offshore converter station; then, the offshore generator stops running, and meanwhile, the offshore flexible direct current converter valve is switched to an alternating current voltage closed-loop control strategy; and finally, unlocking the offshore conventional direct current converter valve and the onshore flexible direct current converter valve, so that a starting method of the offshore wind power delivery system can be provided, and the reliability and the stability in the starting process are improved.
Drawings
FIG. 1 is a schematic view of a topology of an offshore wind power delivery system provided by the present invention;
fig. 2 is a schematic flow chart of a starting method of the offshore wind power direct current output system according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic topology diagram of an offshore wind power delivery system provided by the present invention.
The method for starting the offshore wind power direct current sending-out system comprises an offshore converter station and an onshore converter station, wherein the offshore converter station comprises an offshore flexible direct current converter valve and an offshore conventional direct current converter valve, the offshore flexible direct current converter valve and the offshore conventional direct current converter valve are connected in series, and the onshore converter station comprises an onshore flexible direct current converter valve. The onshore flexible direct current converter valve can adopt a topological structure of a full-bridge submodule and also can adopt a topological structure of a full-half-bridge hybrid submodule.
In the offshore wind power delivery system, two ends of the offshore conventional direct current converter valve are connected with a bypass switch Q2 in parallel, when the offshore converter station and the onshore converter station are not unlocked (i.e. in an initial state), the bypass switch Q2 is in a closed state, a bypass knife switch S1 on the alternating current side of the onshore converter station is in an open state, and meanwhile, a circuit breaker Q1, a circuit breaker Q3 and a circuit breaker Q4 are also in an open state.
It can be understood that the above topology structure of the offshore wind power delivery system can reduce the volume and weight of the offshore converter station, but at the same time, the difficult start is brought, so the embodiment of the invention provides a start strategy for the offshore converter station for delivering offshore wind power and the onshore converter station.
Referring to fig. 2, fig. 2 is a schematic flow diagram of a starting method of an offshore wind power direct current sending-out system according to an embodiment of the present invention. The starting method of the offshore wind power direct current sending-out system provided by the embodiment of the invention comprises the following steps from S11 to S17:
step S11, charging the offshore flexible direct current converter valve and the onshore flexible direct current converter valve through a starting resistor of the onshore converter station, and then starting an offshore generator;
step S12, controlling the direct current side voltage to be a preset voltage by the energy consumption device of the onshore converter station;
s13, unlocking the offshore flexible direct current converter valve, and merging the offshore flexible direct current converter valve into an offshore generator;
s14, starting the fans of the offshore wind farm one by one based on the running state of the offshore generator, and stopping starting the fans when detecting that the power of the fans is greater than the power consumed by the offshore converter station;
s15, the offshore generator quits operation, and synchronously the offshore flexible direct current converter valve is switched to an alternating current voltage closed-loop control strategy;
s16, unlocking the offshore conventional direct current converter valve, and controlling the offshore conventional direct current converter valve to gradually increase the direct current voltage to the direct current rated voltage of the onshore flexible direct current converter valve;
and S17, unlocking the onshore flexible direct current converter valve.
In this embodiment of the present invention, in step S11, the circuit breaker Q1 may be turned on to charge the capacitor of the offshore flexible dc converter valve by using the onshore converter station starting resistor and the power supply. The onshore converter station carries out uncontrolled charging and controllable charging through the starting resistor to charge the module voltage to the rated voltage, and the offshore flexible direct current converter valve is charged through the direct current side. Meanwhile, the module voltage of the offshore flexible direct current converter valve can be charged to the rated voltage.
In the embodiment of the present invention, "starting the offshore generator" in the step S11 may be performed by closing the circuit breaker Q4 and the circuit breaker Q5, so that the offshore flexible dc converter valve is connected to the offshore generator at the ac side transformer. At the moment, the power module of the offshore flexible direct current converter valve is charged, so that no impact current exists, and the offshore generator does not need to consider the charging power of the offshore flexible direct current converter valve, so that the offshore converter station does not need to be provided with a starting resistor.
In an alternative embodiment, the preset voltage is a rated dc voltage of the offshore flexible dc converter valve.
In the embodiment of the invention, the energy consumption device of the onshore converter station consumes electric energy, so that the voltage of the direct current side is reduced, and the voltage of the direct current side is controlled to be the rated direct current voltage of the offshore flexible direct current converter valve through the energy consumption device, so that the subsequent starting operation of the offshore flexible direct current converter valve is facilitated.
In an optional embodiment, the unlocking the offshore flexible direct current converter valve specifically comprises:
and the marine flexible direct current converter valve is unlocked through a direct current voltage outer ring control strategy.
In an optional embodiment, the unlocking the offshore conventional dc converter valve specifically comprises:
the offshore flexible direct current converter valve controls the alternating voltage of the offshore flexible direct current converter valve to be reduced to 0, controls the state of the alternating voltage of the offshore flexible direct current converter valve to be 0, maintains the state for a first preset time, and then gradually raises the alternating voltage of the offshore flexible direct current converter valve to the alternating current rated voltage of the offshore flexible direct current converter valve within a second preset time; when the fact that the alternating current voltage of the offshore flexible direct current converter valve is reduced to 0 is detected, unlocking a transformer of the offshore conventional direct current converter valve;
and unlocking the offshore conventional direct current converter valve.
Specifically, the first preset time is 200ms, and the second preset time is 500ms. Of course, the first preset time and the second preset time are not particularly limited in the present invention.
It is worth to be noted that, in the embodiment of the present invention, when the ac voltage of the offshore flexible dc converter valve is 0, the transformer of the offshore conventional dc converter valve is put into the offshore flexible dc converter valve, and there is no transformer start inrush current of the offshore conventional dc converter valve. In particular, the transformer of said marine conventional dc converter valve can be switched on by closing the circuit breaker Q3.
In the embodiment of the invention, when the offshore conventional direct current converter valve is unlocked, the triggering angle of the offshore conventional direct current converter valve is rapidly reduced from 150 degrees to 90 degrees, and at the moment, the bypass switch Q2 is in a current zero-crossing point and can be automatically switched off.
In an alternative embodiment, in step S16, "control the offshore conventional dc converter valve to gradually increase the dc voltage to the dc rated voltage of the onshore flexible dc converter valve" specifically includes:
and controlling the DC voltage of the offshore conventional DC converter valve to gradually increase to the DC rated voltage of the onshore flexible DC converter valve by adjusting the firing angle of the offshore conventional DC converter valve.
In the embodiment of the invention, when the offshore conventional direct current converter valve gradually increases the direct current voltage to the direct current rated voltage of the onshore flexible direct current converter valve, the direct current voltage control command of the energy consumption device is synchronously increased.
In the embodiment of the invention, because the direct-current voltage of the offshore conventional direct-current converter valve can be changed between 0 and the rated voltage, when the offshore conventional direct-current converter valve is unlocked and then the bypass switch Q2 is disconnected, the direct-current voltage at two ends of the offshore conventional direct-current converter valve is 0, and therefore, the power can be transmitted only by gradually increasing to the direct-current rated voltage.
In the embodiment of the present invention, in the process of implementing the step S17 "unlocking the onshore converter valve", after the dc voltage of the offshore conventional dc converter valve is increased to the rated voltage, the circuit breaker Q1 is turned on, so that the onshore flexible dc converter valve is charged through the ac side, and then the bypass knife switch S1 is turned on, the onshore flexible dc converter valve is automatically unlocked after the charging is successful, the energy consuming device is out of operation, and the unlocking is completed.
The method for starting the offshore wind power direct current sending-out system comprises the steps of firstly charging an offshore flexible direct current converter valve and the onshore flexible direct current converter valve through a starting resistor of the onshore converter station, then starting an offshore generator, controlling direct current side voltage to be preset voltage by an energy consumption device of the onshore converter station, unlocking the offshore flexible direct current converter valve, merging the offshore flexible direct current converter valve into the offshore generator, then starting fans of an offshore wind power plant one by one based on the running state of the offshore generator, and stopping starting the fans when detecting that the power of the fans is larger than the power consumed by the offshore converter station; then, the offshore generator stops running, and meanwhile, the offshore flexible direct current converter valve is switched to an alternating current voltage closed-loop control strategy; and finally, unlocking the offshore conventional direct current converter valve and the onshore flexible direct current converter valve, so that a starting method of the offshore wind power delivery system can be provided, and the reliability and the stability in the starting process are improved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (5)
1. A starting method of an offshore wind power direct current sending-out system, wherein the offshore wind power direct current sending-out system comprises an offshore converter station and an onshore converter station, the offshore converter station comprises an offshore flexible direct current converter valve and an offshore conventional direct current converter valve, the offshore flexible direct current converter valve and the offshore conventional direct current converter valve are connected in series, and the onshore converter station comprises an onshore flexible direct current converter valve, the starting method is characterized by comprising the following steps:
charging the offshore flexible direct current converter valve and the onshore flexible direct current converter valve through a starting resistor of the onshore converter station, and then starting an offshore generator;
the energy consumption device of the onshore converter station controls the voltage of the direct current side to be a preset voltage;
unlocking the offshore flexible direct current converter valve and incorporating the offshore flexible direct current converter valve into an offshore generator;
starting the fans of the offshore wind farm one by one based on the running state of the offshore generator, and stopping starting the fans when detecting that the power of the fans is greater than the power consumed by the offshore converter station;
the offshore generator stops running, and synchronously the offshore flexible direct current converter valve is switched to an alternating current voltage closed-loop control strategy;
unlocking the offshore conventional direct current converter valve, and controlling the offshore conventional direct current converter valve to gradually increase the direct current voltage to the direct current rated voltage of the onshore flexible direct current converter valve;
and unlocking the onshore flexible direct current converter valve.
2. The method for starting the offshore wind power direct current transmission system of claim 1, wherein the preset voltage is a rated direct current voltage of the offshore flexible direct current converter valve.
3. The method for starting an offshore wind power direct current export system according to claim 1, wherein said unlocking of said offshore flexible direct current converter valve is in particular:
the marine flexible direct current converter valve is unlocked through an alternating current voltage outer ring control strategy.
4. The method for starting an offshore wind power direct current export system according to claim 1, wherein said unlocking of said offshore conventional direct current converter valve is in particular:
the offshore flexible direct current converter valve controls the alternating voltage of the offshore flexible direct current converter valve to be reduced to 0, controls the state of the alternating voltage of the offshore flexible direct current converter valve to be 0, maintains the state for a first preset time, and then gradually raises the alternating voltage of the offshore flexible direct current converter valve to the alternating current rated voltage of the offshore flexible direct current converter valve within a second preset time; when the alternating current voltage of the offshore flexible direct current converter valve is detected to be reduced to 0, a transformer of the offshore conventional direct current converter valve is thrown in;
and unlocking the offshore conventional direct current converter valve.
5. The method for starting an offshore wind power direct current export system according to claim 1, wherein said controlling of said offshore conventional dc converter valve gradually increases the dc voltage to the dc rated voltage of said onshore flexible dc converter valve, in particular:
and controlling the offshore conventional direct current converter valve to gradually increase the direct current voltage to the direct current rated voltage of the onshore flexible direct current converter valve by adjusting the firing angle of the offshore conventional direct current converter valve.
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| CN202110752626.8A CN113612377B (en) | 2021-07-02 | 2021-07-02 | Starting method of offshore wind power direct current sending-out system |
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| CN114583743B (en) * | 2022-03-23 | 2022-11-22 | 国网经济技术研究院有限公司 | Control method of offshore wind power uncontrolled rectification direct current transmission system |
| CN116231721B (en) * | 2023-05-09 | 2023-07-21 | 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 |
Citations (3)
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| CN110994662A (en) * | 2019-11-12 | 2020-04-10 | 许继电气股份有限公司 | Start-stop control method for offshore wind power flexible direct current delivery system |
| CN112421669A (en) * | 2020-12-10 | 2021-02-26 | 南方电网科学研究院有限责任公司 | Alternating current fault ride-through method and system for offshore wind power through flexible direct current transmission |
| CN112600246A (en) * | 2020-12-18 | 2021-04-02 | 全球能源互联网研究院有限公司 | Offshore wind power flexible direct current grid-connected system and starting method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994662A (en) * | 2019-11-12 | 2020-04-10 | 许继电气股份有限公司 | Start-stop control method for offshore wind power flexible direct current delivery system |
| CN112421669A (en) * | 2020-12-10 | 2021-02-26 | 南方电网科学研究院有限责任公司 | Alternating current fault ride-through method and system for offshore wind power through flexible direct current transmission |
| CN112600246A (en) * | 2020-12-18 | 2021-04-02 | 全球能源互联网研究院有限公司 | Offshore wind power flexible direct current grid-connected system and starting method thereof |
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