CN112636387B - Offshore full-direct-current wind power plant flexible starting method based on controllable charging - Google Patents
Offshore full-direct-current wind power plant flexible starting method based on controllable charging Download PDFInfo
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- CN112636387B CN112636387B CN202011416023.2A CN202011416023A CN112636387B CN 112636387 B CN112636387 B CN 112636387B CN 202011416023 A CN202011416023 A CN 202011416023A CN 112636387 B CN112636387 B CN 112636387B
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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
- H02J3/381—Dispersed generators
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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
- 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]
Abstract
The invention discloses an offshore full-direct-current wind power plant flexible starting method based on controllable charging, wherein a full-direct-current wind power plant comprises at least one collecting branch, each collecting branch is connected with at least one direct-current wind turbine generator, each collecting branch is connected with a collecting bus through a first isolating switch, the input end of a direct-current booster station is connected with the collecting bus through a second isolating switch, the output end of the direct-current booster station is connected with a converter station through a third isolating switch, the whole voltage of a direct-current collecting system of the wind power plant is established in a mode that the direct-current booster station is charged step by step according to the relation between a preset slope and charging time, under the condition that a direct-current breaker and a starting resistor are not required to be additionally configured, the safe and impact-free flexible starting of the full-direct-current wind power plant is realized, the equipotential closing of all isolating switches is ensured, and overvoltage and overcurrent are not generated in the system in the starting process is ensured.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a flexible starting method of an offshore full-direct-current wind power station based on controllable charging.
Background
The construction of the open sea wind power plant is an important way for developing and utilizing offshore wind energy resources and promoting clean transformation of an energy structure, the open sea wind power needs to be transmitted by a long-distance submarine cable and then can be connected to a land power grid, the open sea wind power is influenced by the distributed capacitance of the submarine cable, and the effective sending of the large-scale open sea wind power is difficult to realize by adopting the traditional high-voltage alternating-current transmission technology. At present, the technical scheme of 35kV alternating current collection, offshore alternating current booster station and offshore flexible direct current converter station or 66kV alternating current collection and offshore flexible direct current converter station is generally adopted in the open-sea wind power plant. According to the scheme, the electric energy collection in the wind power plant is realized by adopting a 35kV or 66kV medium-voltage alternating current collection system, and two prominent technical short boards exist: the problem of idle loss of submarine cables is difficult to fully adapt to the collection networking requirements of large-range offshore wind turbine generators; the power frequency transformers are needed to be used in a large quantity, the manufacturing cost is high, the size and the weight are large, and the load of the offshore platform is obviously increased.
In recent years, domestic and foreign scholars propose a new technical concept of offshore wind farm direct current collection, as shown in fig. 1, a high-gain generator-side DC-DC is adopted to replace a grid-side converter and a power frequency transformer in a traditional alternating current wind turbine generator, and a direct current voltage U output by a generator-side converter is used link-1 (plus or minus 2.5kV can be taken) is raised to a DC collecting voltage U cl-1 (usually +/-50 kV to +/-100 kV) and realizing electric energy collection, and finally further lifting the voltage to a direct current transmission voltage U through a direct current booster station arranged on the offshore platform tr-1 (usually +/-320 kV to +/-500 kV), thereby realizing High Voltage Direct Current (HVDC) cross-sea transmission. The medium and high voltage direct current circuit breakers have the problems of high cost, complex starting steps, long starting time and overvoltage and overcurrent in starting engineering.
Disclosure of Invention
Therefore, the offshore full-direct-current wind power plant flexible starting method based on controllable charging overcomes the defects of high cost, complex starting steps and long starting time of a medium-high voltage direct-current circuit breaker adopted in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the embodiment of the invention provides an offshore full-direct-current wind power plant flexible starting method based on controllable charging, wherein the full-direct-current wind power plant comprises at least one collecting branch, each collecting branch is connected with at least one direct-current wind turbine generator, each collecting branch is connected with a collecting bus through a first isolating switch, the input end of a direct-current booster station is connected with the collecting bus through a second isolating switch, and the output end of the direct-current booster station is connected with a converter station through a third isolating switch; wherein, the first and the second end of the pipe are connected with each other,
under the condition that the direct current booster station is in a starting state, the wind power station control system sends a switching instruction to each direct current wind turbine generator, and controls the direct current wind turbine generators to be in a switching state;
the method comprises the steps that a direct current booster station receives a system charging instruction sent by a flexible-direct control system, establishes voltage according to the relation between a preset slope and charging time, and enters a controllable charging state;
when the absolute value of the difference between the voltage of the high-voltage port of the first direct-current converter in the direct-current wind turbine generator and the voltage of the high-voltage port of the first direct-current converter monitored in real time is smaller than a preset voltage threshold, the input voltage of the low-voltage side port of the first direct-current converter is determined according to the preset proportion of the voltage of the first direct-current converter, and the direct-current wind turbine generator is started to work.
In one embodiment, the second dc converter in the dc booster station is a three-port power electronic device with bidirectional power flow characteristics, the field-side port is connected to the collection bus, the grid-side port is connected to the converter station via a high-voltage dc transmission submarine cable, the dc auxiliary power supply port is connected to the three-phase ac auxiliary second power supply bus through a second auxiliary inverter, and a generator is connected to the auxiliary second power supply bus.
In an embodiment, the starting process of the dc boost station includes:
starting a generator to establish a three-phase alternating-current voltage auxiliary second power supply bus and a wind power plant station control system;
closing the second isolating switch and the third isolating switch, charging the high-voltage direct-current transmission submarine cable, and establishing the voltage of a network side port of the direct-current booster station;
and closing the first isolating switch, establishing the voltage of the direct current auxiliary power supply port, starting the second auxiliary inverter for auxiliary power supply, and stopping the generator.
In one embodiment, a first direct current converter in a direct current wind turbine generator is a two-port power electronic device with bidirectional energy flow characteristics, the rated voltage of the low-voltage side of the first direct current converter is connected with an alternating current-direct current converter, the rated voltage of the high-voltage side of the first direct current converter is connected with a collection branch circuit through a fourth isolating switch, the left end and the right end of the connection point of each direct current wind turbine generator and each collection branch circuit are respectively connected with a fifth isolating switch and a sixth isolating switch, the rated voltage of the low-voltage side of the first direct current converter is connected with a three-phase alternating current auxiliary first power supply bus through a first auxiliary inverter, and an uninterruptible power supply is hung on the auxiliary first power supply bus.
In one embodiment, the method for controlling the direct current wind turbine generators to be in the input state includes:
establishing a three-phase alternating current auxiliary first power supply bus voltage of the direct current wind turbine generator by means of an uninterruptible power supply;
and closing the fourth isolating switch, the fifth isolating switch and the sixth isolating switch according to the input instruction of the wind power plant station control system, so that the direct-current wind turbine generator is in an input state.
In an embodiment, a second dc converter in the dc boost station receives a system charging instruction sent by the flexible-direct control system, a field-side port of the second dc converter in the dc boost station is unlocked, a voltage is established according to a relationship between a preset slope and charging time, and an output capacitor of each dc wind turbine is controllably charged.
In one embodiment, the relationship between the predetermined slope and the charging time is:
wherein, U * cl For charging the fieldSide port voltage, t c For the charging time, k ch Is a predetermined slope.
In one embodiment, when the direct-current wind turbine generator is controlled to be in an input state, a first auxiliary inverter of the direct-current wind turbine generator is started to undertake auxiliary power supply, and the uninterruptible power supply stops supplying power.
The technical scheme of the invention has the following advantages:
the invention provides a flexible starting method of an offshore full-direct-current wind power plant based on controllable charging, wherein the full-direct-current wind power plant comprises at least one collecting branch, each collecting branch is connected with at least one direct-current wind turbine generator, each collecting branch is connected with a collecting bus through a first isolating switch, the input end of a direct-current booster station is connected with the collecting bus through a second isolating switch, the output end of the direct-current booster station is connected with a converter station through a third isolating switch, the whole voltage of the direct-current collecting system of the wind power plant is established in a mode that the direct-current booster station is charged step by step according to the relation between a preset slope and charging time, under the condition that a direct-current breaker and a starting resistor are not required to be additionally configured, the safe and impact-free flexible starting of the full-direct-current wind power plant is realized, the equipotential closing of all the isolating switches is ensured, and the overvoltage and overcurrent are not generated in the system in the starting process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a block diagram of one particular example of a prior art wind farm DC aggregate;
fig. 2 is a system structure diagram of a specific example of an offshore full-dc wind farm flexible starting method based on controllable charging according to an embodiment of the present invention;
FIG. 3 is a flowchart of a specific example of a method for flexibly starting an offshore full DC wind farm based on controllable charging according to an embodiment of the present invention;
fig. 4 is a structural diagram of a specific example of a dc booster station according to an embodiment of the present invention;
fig. 5 is a structural diagram of a specific example of the direct current wind turbine provided in the embodiment of the present invention;
fig. 6 is a schematic diagram of charging a port on the site side of a dc booster station according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be connected through the inside of the two elements, or may be connected wirelessly or through a wire. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Examples
The method for flexibly starting the offshore full-direct-current wind power plant based on controllable charging is applicable to the flexible starting of the controllable charging of the full-direct-current wind power plant in various scenes i ～DS N ) Connected with the collecting bus, the input end of the DC booster station passes through a second isolating switch (DS) bus ) Is connected with the collection bus, and the output end of the DC booster station passes through a third isolating switch (DS) tr ) Connecting a converter station, and providing a direct current collection system flexible starting method based on machine and network two-way charging; as shown in fig. 3, the method comprises the following steps:
step S1: under the condition that the direct current booster station is in a starting state, the wind power station control system sends an input instruction to each direct current wind turbine, and the wind power station control system is a background control system of the full direct current wind power station and controls the direct current wind turbines to be in an input state.
In the embodiment of the present invention, as shown in fig. 4, the second DC converter (second DC-DC converter) in the DC booster station is a three-port power electronic device with bidirectional power flow characteristics, and the field-side port is connected to the collection bus and has a rated voltage of (U) cl ) The network side port is connected with the converter station through a high-voltage direct-current transmission submarine cable, and the rated voltage of the converter station is (U) tr ) The dc auxiliary power supply port is connected to the three-phase ac auxiliary second power supply bus through the second auxiliary inverter, the three-phase ac may be 400V ac, which is exemplified and not limited, and in practical application, the corresponding voltage is selected according to practical requirements, and the rated voltage of the dc auxiliary power supply port is (U) V AUX ) The auxiliary second power supply bus is connected with a generator serving as a backup power supply in a hanging manner, and the generator can be used for power generationA diesel generator is used, without limitation.
In an embodiment of the present invention, a process of starting the dc boost station includes: starting a generator to establish a three-phase alternating current voltage auxiliary second power supply bus and a wind power plant station control system; closing the second isolator switch (DS) bus ) A third isolating switch (DS) tr ) And at the moment, the converter station is unlocked, the high-voltage direct-current transmission submarine cable is charged, and the voltage (U) of the network side port of the direct-current booster station is established tr ) (ii) a Closing the first Disconnector (DS) i ) Wherein i = 1-N, the auxiliary power supply port of the second DC converter of the DC booster station is unlocked, and the voltage (U) of the auxiliary power supply port of the DC booster station is established AUX ) And starting the second auxiliary inverter to supply power in an auxiliary manner, and stopping the generator.
In the embodiment of the invention, the method for controlling the direct current wind turbine generators to be in the input state includes the following steps: establishing a three-phase alternating current auxiliary first power supply bus voltage of the direct current wind turbine generator by means of an Uninterrupted Power Supply (UPS); according to the input instruction of the wind power station control system, a fourth Disconnecting Switch (DS) is closed ij-0 ) And a fifth Disconnecting Switch (DS) ij-1 ) And a sixth Disconnecting Switch (DS) ij-2 ) And the direct current wind turbine generator is in an input state.
Step S2: and the direct current booster station receives a system charging instruction sent by the flexible-direct control system, establishes voltage according to the relation between the preset slope and the charging time, and enters a controllable charging state.
In the embodiment of the present invention, as shown in fig. 2 and 5, the dc wind turbine includes: the fan, an alternating current-direct current converter (AC-DC) and a second DC converter; a first direct current converter in the direct current wind turbine generator is a two-port power electronic device with bidirectional energy flow characteristics, and the low-voltage side rated voltage (U) of the first direct current converter link ) A high-voltage side rated voltage (U) connected to the AC-DC converter cl ) Via a fourth isolator switch (DS) ij-0 ) Connecting and collecting branches, wherein ij represents the jth direct current wind turbine connected with the ith collecting branch, and the left end and the right end of the connecting point of each direct current wind turbine and each collecting branch are respectively connected with a fifth isolating switch (DS) ij-1 ) And a sixth Disconnecting Switch (DS) ij-2 ) Rated voltage (U) of low side of first DC-DC converter link ) The three-phase alternating current auxiliary first Power Supply bus is connected with a first auxiliary inverter, and an Uninterruptible Power Supply (UPS) is hung on the auxiliary first Power Supply bus.
In an embodiment of the present invention, a second dc converter in a dc boost station receives a system charging command from a soft-direct control system, where the soft-direct control system includes: after receiving a system charging command, the dc booster station and the converter station unlock a second dc converter field-side port in the dc booster station, as shown in fig. 6, and gradually establish a voltage with a preset slope reference in a constant voltage control mode, for example only, but not limited thereto, and select a suitable value according to actual requirements in actual application to charge the dc collection system of the whole wind farm and the output capacitors of the units, and finally establish a system collection voltage (U) in which U is a collection voltage of the system cl ) Reference instruction U of field port voltage in charging process * cl And duration of charging t c Satisfies the formula:
controllably charging output capacitors of the DC wind turbines, wherein U * cl For field side port voltage during charging, t c For the charging time, k ch The method has the advantages that the slope is preset, the starting steps of the full-direct-current wind power plant based on controllable charging are simple, the starting time is short, the whole wind power plant can be charged at the same time, a unidirectional system charging mode from a network to a source, which is dominated by a direct-current booster station, is adopted, a unit is not required to have a voltage source output mode, and the unit control strategy is simple.
And step S3: when the absolute value of the difference between the voltage of the high-voltage port of the first direct-current converter in the direct-current wind turbine generator and the voltage of the high-voltage port of the first direct-current converter monitored in real time is smaller than a preset voltage threshold value, the input voltage of the low-voltage side port of the first direct-current converter is determined according to the preset proportion of the voltage of the first direct-current converter, and the direct-current wind turbine generator is started to work.
In the embodiment of the invention, the direct current wind turbine generatorAfter being put into operation, the voltage (u) of the high-voltage port of the second DC converter is continuously monitored ij ) Until it satisfies the formula | u ij -U cl |≤Δu th Then, the voltage of the high-voltage port of the first direct-current converter is determined to be u ij Determining the input voltage of a low-voltage side port of a first direct-current converter according to a preset voltage proportion of the first direct-current converter, unlocking the first direct-current converter at the generator end of the direct-current wind turbine generator, charging a low-voltage direct-current bus in the generator by using the voltage input at the low-voltage side, and establishing a low-voltage side rated voltage (U) of the first direct-current converter link )。
In the embodiment of the invention, when the direct-current wind turbine generator is controlled to be in an input state, the first auxiliary inverter of the direct-current wind turbine generator is started to undertake auxiliary power supply, and the uninterrupted power supply stops supplying power.
According to the flexible starting method of the offshore full-direct-current wind power plant based on controllable charging, the full-direct-current wind power plant comprises at least one collecting branch, each collecting branch is connected with at least one direct-current wind turbine generator, each collecting branch is connected with a collecting bus through a first isolating switch, the input end of a direct-current booster station is connected with the collecting bus through a second isolating switch, the output end of the direct-current booster station is connected with a converter station through a third isolating switch, the whole voltage of the direct-current collecting system of the wind power plant is established in a mode that the direct-current booster station is charged step by step according to the relation between the preset slope and the charging time, under the condition that a direct-current breaker and a starting resistor are not required to be additionally configured, safe and impact-free flexible starting of the full-direct-current wind power plant is achieved, the equipotential closing of all the isolating switches is guaranteed, and overvoltage and overcurrent are not generated in the system in the starting process is guaranteed.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (4)
1. A flexible starting method of an offshore full-direct-current wind power plant based on controllable charging is characterized in that the full-direct-current wind power plant comprises at least one collecting branch, each collecting branch is connected with at least one direct-current wind turbine generator, each collecting branch is connected with a collecting bus through a first isolating switch, the input end of a direct-current booster station is connected with the collecting bus through a second isolating switch, and the output end of the direct-current booster station is connected with a converter station through a third isolating switch; wherein the content of the first and second substances,
under the condition that the direct current booster station is in a starting state, the wind power plant station control system sends an input instruction to each direct current wind turbine generator to control the direct current wind turbine generators to be in an input state;
the method comprises the steps that a direct current booster station receives a system charging instruction sent by a flexible-direct control system, establishes voltage according to the relation between a preset slope and charging time, and enters a controllable charging state;
when the absolute value of the difference between the rated voltage of the high-voltage port of the first direct-current converter in the direct-current wind turbine generator and the voltage of the high-voltage port of the first direct-current converter monitored in real time is smaller than a preset voltage threshold, determining the input voltage of the low-voltage side port of the first direct-current converter according to the preset proportion of the voltage of the first direct-current converter, and starting the direct-current wind turbine generator to work;
a second direct current converter in the direct current booster station is a three-port power electronic device with bidirectional energy flow characteristics, a field side port is connected with a collecting bus, a network side port is connected with a converter station through a high-voltage direct current transmission submarine cable, a direct current auxiliary power supply port is connected with a three-phase alternating current auxiliary second power supply bus through a second auxiliary inverter, and a generator is hung on the auxiliary second power supply bus;
the process of starting the direct current booster station comprises the following steps: starting a generator to establish a three-phase alternating current voltage auxiliary second power supply bus and a wind power plant station control system; closing the second isolating switch and the third isolating switch, charging the high-voltage direct-current transmission submarine cable, and establishing the voltage of a network side port of the direct-current booster station; closing the first isolating switch, establishing the voltage of a direct current auxiliary power supply port, starting a second auxiliary inverter for auxiliary power supply, and stopping the generator;
the first direct current converter in the direct current wind turbine generator set is a two-port power electronic device with bidirectional energy flow characteristics, the rated voltage of the low-voltage side of the first direct current converter is connected with an alternating current-direct current converter, the rated voltage of the high-voltage side of the first direct current converter is connected with collection branches through a fourth isolating switch, the left end and the right end of the connection point of each direct current wind turbine generator set and each collection branch are respectively connected with a fifth isolating switch and a sixth isolating switch, the rated voltage of the low-voltage side of the first direct current converter is connected with a three-phase alternating current auxiliary first power supply bus through a first auxiliary inverter, and an uninterruptible power supply is hung on the auxiliary first power supply bus;
the wind power station control system sends an input instruction to each direct current wind turbine generator, and controls the direct current wind turbine generators to be in an input state, and the method comprises the following steps: establishing a three-phase alternating current auxiliary first power supply bus voltage of the direct current wind turbine generator by means of an uninterruptible power supply; and closing the fourth isolating switch, the fifth isolating switch and the sixth isolating switch according to an input instruction of the wind power plant station control system, so that the direct current wind turbine generator is in an input state.
2. The offshore full-direct-current wind power plant flexible starting method based on controllable charging according to claim 1, characterized in that a second direct-current converter in the direct-current booster station receives a system charging instruction sent by a flexible-direct-current control system, a second direct-current converter field-side port in the direct-current booster station is unlocked, voltage is established according to a relation between a preset slope and charging time, and output capacitors of all direct-current wind power generation sets are charged controllably.
3. The offshore full direct current wind farm flexible starting method based on controllable charging according to claim 1, characterized in that the relationship between the preset slope and the charging time is as follows:
wherein the content of the first and second substances,U * cl for field-side port voltages during charging,t c for the purpose of the charging time, it is,k ch is a predetermined slope.
4. The offshore full direct current wind farm flexible starting method based on controllable charging according to claim 1, characterized in that when the direct current wind turbine generator is controlled to be in an input state, a first auxiliary inverter of the direct current wind turbine generator is started to undertake auxiliary power supply, and the uninterruptible power supply stops supplying power.
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| Start-up Strategy for DR-MMC Paralleled Hybrid HVDC Integrated with Offshore Wind Power;Xianyu Li 等;《2020 IEEE 4th Conference on Energy Internet and Energy System Integration (EI2)》;20201101;665-669 * |
| 海上风电场黑启动系统的风柴协同控制策略;陈夏 等;《电力系统自动化》;20200710;第44卷(第13期);98-105 * |
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