GB2611623A - Frequency forming method and system for converter-based power grid - Google Patents

Frequency forming method and system for converter-based power grid Download PDF

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Publication number
GB2611623A
GB2611623A GB2212023.2A GB202212023A GB2611623A GB 2611623 A GB2611623 A GB 2611623A GB 202212023 A GB202212023 A GB 202212023A GB 2611623 A GB2611623 A GB 2611623A
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Prior art keywords
frequency
converters
grid
converter
forming
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GB2611623B (en
GB202212023D0 (en
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Han Minxiao
Cao Wenyuan
Zhao Zhengkui
Zhang Yuewei
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North China Electric Power University
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North China Electric Power University
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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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • 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
    • 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
    • H02M7/493—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 the static converters being arranged for operation in parallel
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

a frequency forming method and system for a converter-based power grid, which determines a control mode of grid-forming converters based on a number of the grid-forming converters and a communication configuration status among the converters, where a fixed-frequency control mode is used when a single converter is provided, and a coordinated control mode is used when a plurality of converters are provided, in either a master-slave control mode or a frequency droop control mode dependent on the presence of a communication network. The converter in the present disclosure determines the frequency of the power grid, and can be used for frequency forming and operation control over converter-based power grids such as a large power grid, a regional power grid, and a microgrid that use ultra-high-proportion or even full renewable energy.

Description

FREQUENCY FORMING METHOD AND SYSTEM FOR CONVERTER-BASED
POWER GRID
TECHNICAL FIELD
100011 The present disclosure relates to the field of power system planning, and in particular, to a frequency forming method and system for a converter-based power grid.
BACKGROUND ART
100021 Power generation by using high-proportion renewable energy and high-proportion power electronic equipment are changing the form of a power system. When renewable energy-based power generation accounts for a relatively low proportion, the main problems faced with by a power grid are power quality problems caused by randomness, fluctuation, and nonlinearity of renewable energy power. A conventional power system with a synchronous generator as a core cannot meet a demand of a new-generation power system for power generation by using ultra-high-proportion or even full renewable energy.
100031 Development of converters based on a power electronics technology causes the form of a power supply to be changed substantially, and a frequency of a power grid is determined by converters rather than by a conventional synchronous generator. With development of a power electronic converter technology, characteristics of a converter apparatus can be flexibly determined by a control policy thereof By coordinating V/f control, a grid-forming converter, which is related to a high-capacity chemical energy storage system, voltage source converter based high voltage direct current transmission (VSC-HVDC), full-power variable-speed pumped storage, and the like, can implement voltage and frequency control of a power grid, thereby providing technical feasibility for constructing a novel power grid with converters as the core. In addition, when the power Did voltage and frequency are tracked, a grid-following converter related to renewable energy-based power generation maximizes efficiency of new energy-based power generation.
100041 In recent years, a lot of research work has been done on renewable energy-based power generation and grid connection, including power system planning, optimized operation, a control policy, stability analysis, and the like. However, the background of the foregoing research is still based on a power system with the conventional synchronous generator as a main body, the proportion of renewable energy connected to the grid is constantly increasing, and the novel power grid with converters as the core is the direction in which the future power grid is developed. Therefore, currently, it is urgent to plan and study a construction mechanism of a converter-based power grid using ultra-high-proportion new energy.
SUMMARY
[0005] An objective of some embodiments is to provide a frequency forming method and system for a converter-based power grid, which determine a frequency of a power grid by using converters, to implement frequency forming of the power grid using ultra-high-proportion new energy.
[0006] In order to achieve the above objective, the present disclosure provides the following technical solutions: [0007] A frequency forming method for a converter-based power grid includes: [0008] determining a type of each of converters in a new energy power grid, where types of the converters includes a grid-forming converter and a grid-following converter; [0009] counting a number of converters whose converter types are the grid-forming converter; and [0010] allowing, when one grid-forming converter is provided, the one grid-forming converter to operate in a fixed-frequency control mode, and determining a frequency outputted by the grid-forming converter based on the fixed-frequency control mode as a frequency of the new energy power grid; or [0011] allowing, when a plurality of grid-forming converters are provided, the grid-forming converters to operate in a coordinated control mode, and determining a frequency outputted by the grid-forming converters based on the coordinated control mode as a frequency of the new energy power grid.
[0012] Optionally, the allowing, when a plurality of grid-forming converters are provided, the grid-forming converters to operate in a coordinated control mode, and determining a frequency outputted by the grid-forming converters based on the coordinated control mode as a frequency of the new-energy power grind specifically includes: [0013] determining, when the plurality of grid-forming converters are provided, whether there is a communication network among the converters, to obtain a determining result; and [0014] selecting, if the determining result indicates yes, any one of the grid-forming converters as a master converter, allowing the master converter to operate in a fixed-frequency control mode, and determining a frequency outputted by the master converter based on the fixed-frequency control mode as a frequency of the new energy power grid; or [0015] allowing, if the determining result indicates no, the converters to operate in a frequency droop control mode, and determining a frequency outputted by the grid-forming converters based on a droop characteristic curve as a frequency of the new energy power grid.
[0016] Optionally, the allowing the converters to operate in a frequency droop control mode specifically includes: [0017] acquiring a voltage and a current of each of the converters; [0018] calculating output power of each of the converters based on the voltage and the current of each of the converters; and [0019] determining an output frequency of each of the converters by using a power-frequency droop curve based on the output power of each of the converters.
[0020] Optionally, the method further includes: after the selecting, if the determining result indicates yes, any one of the grid-forming converters as a master converter, allowing the master converter to operate in a fixed-frequency control mode, and determining a frequency of output by the master converter based on the fixed-frequency control mode as a frequency of the new energy power grid, [0021] determining converters other than the master converter in the new energy power grid as slave converters, where information is exchanged between the master converter and the slave converters via a communication network.
[0022] A frequency forming system for a converter-based power grid includes: [0023] a converter type determining module, configured to determine a type of each of converters in a new energy power grid, where types of the converters includes a grid-forming converter and a grid-following converter; [0024] a converter quantity counting module, configured to count a number of converters whose converter types are the grid-forming converter; [0025] a fixed-frequency control module, configured to allow, when one grid-forming converter is provided, the one grid-forming converter to operate in a fixed-frequency control mode, and determine a frequency outputted by the grid-forming converter based on the fixed-frequency control mode as a frequency of the new energy power grid; and [0026] a coordinated control module, configured to allow, when a plurality of grid-forming converters are provided, the grid-forming converters to operate in a coordinated control mode, and determine a frequency outputted by the grid-forming converters based on the coordinated control mode as a frequency of the new energy power grid.
[0027] Optionally, the coordinated control module specifically includes: [0028] a determining result obtaining submodule, configured to determine, when the plurality of grid-forming converters are provided, whether there is a communication network among the converters, to obtain a determining result; [0029] a master converter selection submodule, configured to select, if the determining result indicates yes, any one of the grid-forming converters as a master converter, allow the master converter to operate in a fixed-frequency control mode, and determine a frequency outputted by the master converter based on the fixed-frequency control mode as a frequency of the new energy power grid; and [0030] a frequency droop control submodule, configured to allow the converters to operate in a frequency droop control mode if the determining result indicates no, and determine a frequency outputted by the grid-forming converters based on a droop characteristic curve as a frequency of the new energy power grid.
[0031] Optionally, the frequency droop control submodule specifically includes: [0032] a local information acquisition unit, configured to acquire a voltage and a current of each of the converters; [0033] an output power calculation unit, configured to calculate output power of each of the converters based on the voltage and the current of each of the converters; and [0034] an output power determining unit, configured to determine an output frequency of each of the converters by using a power-frequency droop curve based on the output power of each of the converters.
[0035] Optionally, the system further includes: [0036] a slave converter determining module, configured to determine converters other than the master converter in the new energy power grid as slave converters, where information is exchanged between the master converter and the slave converters via a communication network. [0037] According to the specific embodiments according to the present disclosure, the present disclosure discloses the following technical effects: [0038] The present disclosure discloses a frequency forming method and system for a converter-based power grid, which determine a control mode of grid-forming converters based on a number of the grid-forming converters and a communication configuration among the converters, use fixed-frequency control mode when a single converter is provided, and use a coordinated control mode when a plurality of converters are provided; and determine a frequency operation mode of the power grid using ultra-high-proportion new energy based on the control mode of the grid-forming converters. The converter in the present disclosure determines the frequency of the power grid, and can be used for frequency forming and operation control over converter-based power grids such as a large power grid, a regional power grid, and a microgrid that use ultra-high-proportion or even full renewable energy.
BRIEF DESCRIPTION OF THE DRAWINGS
[0039] To describe technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the accompanying drawings required in the embodiments are briefly described below. Obviously, the accompanying drawings described below show only some embodiments of the present disclosure. A person of ordinary skill in the art may further obtain other accompanying drawings based on these accompanying drawings without creative efforts. [0040] FIG. 1 is a flowchart of a frequency forming method for a converter-based power grid according to the present disclosure; [0041] FIG. 2 is a diagram showing a principle of a frequency forming method for a converter-based power grid according to the present disclosure; [0042] FIG. 3 is a diagram showing a principle of converter type determination according to the present disclosure; [0043] FIG. 4 is a schematic diagram of a control mode of a grid-forming converter according to the present disclosure; [0044] FIG 5 is a schematic diagram of master-slave control according to the present disclosure; and [0045] FIG 6 is a schematic diagram of frequency droop control according to the present disclosure.
DETAILED DESCRIPTION OF THE EMBODIMENTS
100461 The technical solutions of the embodiments of the present disclosure are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely some rather than all of the embodiments of the present disclosure. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.
[0047] An objective of the present disclosure is to provide a frequency forming method and system for a converter-based power grid, which determine a frequency of the power grid by using converters, to implement frequency forming of the power grid using ultra-high-proportion new energy.
[0048] To make the foregoing objective, features, and advantages of the present disclosure clearer and more comprehensible, the present disclosure will be further described in detail below with reference to the accompanying drawings and specific implementations.
[0049] The present disclosure provides a frequency forming method for a converter-based power grid, as shown in FIGs. 1 and 2, including the following steps 101 to 104.
[0050] In step 101, a type of each of converters in a new energy power grid is determined, where types of the converters include a grid-forming converter and a grid-following converter. [0051] Referring to FIG. 3, based on different control effects on the power grid, the converters are divided into a grid-forming converter and a grid-following converter. The grid-forming converter is mainly connected to an energy storage system, and can control the frequency of the power grid. The grid-following converter is mainly connected to a renewable energy-based power generation system, and tracks the frequency of the power grid.
[0052] In step 102, a number of converters whose converter types are the grid-forming converter is counted.
100531 In step 103, when one grid-forming converter is provided, the one grid-forming converter operates in a fixed-frequency control mode, and a frequency outputted by the grid-forming converter based on the fixed-frequency control mode is determined as a frequency of the new energy power grid.
[0054] The power grid operates in a fixed-frequency mode.
[0055] In step 104, when a plurality of grid-forming converters are provided, the grid-forming converters operate in a coordinated control mode, and a frequency outputted by the grid-forming converters based on the coordinated control mode is determined as a frequency of the new energy power grid.
[0056] Step 104 specifically includes the following processes.
[0057] When the plurality of grid-forming converters are provided, it is determined whether there is a communication network between the converters, to obtain a determining result.
[0058] If the determining result indicates yes, any one of the grid-forming converters is selected as a master converter operating in a fixed-frequency control mode, and a frequency outputted by the master converter based on the fixed-frequency control mode is determined as a frequency of the new energy power grid.
[0059] If the determining result indicates no, the converters operate in a frequency droop control mode, and a frequency outputted by the grid-forming converters based on a droop characteristic curve is determined as a frequency of the new energy power grid.
[0060] A schematic diagram of a control mode of a grid-forming converter is shown in FIG. 4. (1) When only one grid-forming converter is provided, the corresponding grid-forming converter operates in a fixed-frequency control mode; or (2) when a plurality of grid-forming converters are provided, the converters operate in a coordinated control mode. When there is a communication network among the converters, master-slave control is used. When there is no communication network among the converters, frequency droop control is used.
100611 A schematic diagram of master-slave control is shown in FIG. 5, in which any one converter is selected as a master converter, which operates under fixed-frequency control, the remaining converters are used as slave converters, which operate only under current control, and the master converter and the slave converters exchange information via a communication network. When master-slave control is used for the converters, the frequency of the power grid is determined by the master converter, and the power grid operates in a fixed-frequency mode. [0062] A schematic diagram of frequency droop control is shown in FIG. 6, in which converters under droop control are equal in status, and each of the converters is controlled by only a voltage and a current thereof When the frequency droop control is used for the converters, the frequency of the power grid is determined by various converters based on a droop characteristic curve, and the power grid operates in a frequency droop mode. In FIG. 6, a horizontal coordinate represents power, a vertical coordinatelrepresents a frequency, andf represents corresponding frequency at the power of P. [0063] A frequency droop control mode used for converters includes: [0064] acquiring a voltage and a current of each of the converters; [0065] calculating output power of each of the converters based on the voltage and the current of each of the converters; and [0066] determining an output frequency of each of the converters by using a power-frequency droop curve based on the output power of each of the converters.
[0067] Each of the converters under the frequency droop control outputs corresponding power based on power-frequency droop characteristics. In a steady state, there is a certain frequency deviation, but the frequency deviation may be maintained in a reasonable range through a reasonable design of a droop coefficient.
[0068] A frequency of a power grid using ultra-high-proportion new energy is dominated by converters rather than by a synchronous generator in a conventional power system. Therefore, the power grid using ultra-high-proportion new energy can use the frequency forming method according to the present disclosure. The frequency forming method according to the present disclosure has universality in construction and operation control of the power grid using ultra-high-proportion new energy, can be universally applied to converter-based power grids such as a large power grid, a regional power grid, and a microgrid that use ultra-high-proportion or even full renewable energy, and provides theoretical and technical support for further promoting development and implementation of a novel power system with new energy as a main energy.
[0069] The present disclosure further provides a frequency forming system for a converter-based power grid, including: [0070] a converter type determining module, configured to determine a type of each of converters in a new energy power grid, where types of the converters include a grid-forming converter and a grid-following converter; [0071] a converter quantity counting module, configured to count a number of converters whose converter types are the grid-forming converter; [0072] a fixed-frequency control module, configured to allow, when one grid-forming converter is provided, the one grid-forming converter to operate in a fixed-frequency control mode, and determine a frequency outputted by the grid-forming converter based on the fixed-frequency control mode as a frequency of the new energy power grid; and [0073] a coordinated control module, configured to allow, when a plurality of grid-forming converters are provided, the grid-forming converters to operate in a coordinated control mode, and determine a frequency outputted by the grid-forming converters based on the coordinated control mode as a frequency of the new energy power grid.
100741 The coordinated control module specifically includes: [0075] a determining result obtaining submodule, configured to determine, when the plurality of grid-forming converters are provided, whether there is a communication network among the converters, to obtain a determining result; [0076] a master converter selection submodule, configured to select, if the determining result indicates yes, any one of the grid-forming converters as a master converter, allow the master converter to operate in a fixed-frequency control mode, and determine a frequency outputted by the master converter based on the fixed-frequency control mode as a frequency of the new energy power grid; and [0077] a frequency droop control submodule, configured to allow the converters to operate in a frequency droop control mode if the determining result indicates no, and determine a frequency outputted by the grid-forming converters based on a droop characteristic curve as a frequency of the new energy power Did.
[0078] The frequency droop control submodule specifically includes: [0079] a local information acquisition unit, configured to acquire a voltage and a current of each of the converters; [0080] an output power calculation unit, configured to calculate output power of each of the converters based on the voltage and the current of each of the converters; and [0081] an output power determining unit, configured to determine an output frequency of each of the converters by using a power-frequency droop curve based on the output power of each of the converters.
[0082] The system further includes: [0083] a slave converter determining module, configured to determine converters other than the master converter in the new energy power grid as slave converters, where information is exchanged between the master converter and the slave converters via a communication network. [0084] Embodiments of the present specification are described in a progressive manner, each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments may refer to each other. Since the system disclosed in an embodiment corresponds to the method disclosed in another embodiment, the description is relatively simple, and reference may be made to the method description.
100851 Specific examples are used herein to explain the principles and implementations of the present disclosure. The foregoing description of the embodiments is merely intended to help understand the method of the present disclosure and a core idea thereof. In addition, for a person of ordinary skills in the art, changes may be made to the specific implementations and application scope based on the idea of the present disclosure. In conclusion, the content of the present description shall not be construed as limitations to the present disclosure.

Claims (8)

  1. WHAT IS CLAIMED IS: I. A frequency forming method for a converter-based power grid, comprising: determining a type of each of converters in a new energy power grid, wherein types of the converters comprises a grid-forming converter and a grid-following converter; counting a number of converters whose converter types are the grid-forming converter; and allowing, when one grid-forming converter is provided, the one grid-forming converter to operate in a fixed-frequency control mode, and determining a frequency outputted by the grid-forming converter based on the fixed-frequency control mode as a frequency of the new energy power grid; or allowing, when a plurality of grid-forming converters are provided, the grid-forming converters to operate in a coordinated control mode, and determining a frequency outputted by the grid-forming converters based on the coordinated control mode as a frequency of the new energy power grid.
  2. 2. The frequency forming method according to claim 1, wherein the allowing, when a plurality of grid-forming converters are provided, the grid-forming converters to operate in a coordinated control mode, and determining a frequency outputted by the grid-forming converters based on the coordinated control mode as a frequency of the new energy power grid comprises: determining, when the plurality of grid-forming converters are provided, whether there is a communication network among the converters, to obtain a determining result; and selecting, if the determining result indicates yes, any one of the grid-forming converters as a master converter, allowing the master converter to operate in a fixed-frequency control mode, and determining a frequency outputted by the master converter based on the fixed-frequency control mode as a frequency of the new energy power grid; or allowing, if the determining result indicates no, the converters to operate in a frequency droop control mode, and determining a frequency outputted by the grid-forming converters based on a droop characteristic curve as a frequency of the new energy power grid.
  3. 3. The frequency forming method according to claim 2, wherein the allowing the converters to operate in a frequency droop control mode comprises: acquiring a voltage and a current of each of the converters; calculating output power of each of the converters based on the voltage and the current of each of the converters; and determining an output frequency of each of the converters by using a power-frequency droop curve based on the output power of each of the converters.
  4. 4. The frequency forming method according to claim 2, further comprising: after the selecting, if the determining result indicates yes, any one of the grid-forming converters as a master converter, allowing the master converter to operate in a fixed-frequency control mode, and determining a frequency of output by the master converter based on the fixed-frequency control mode as a frequency of the new energy power grid, determining converters other than the master converter in the new energy power grid as slave converters, wherein information is exchanged between the master converter and the slave converters via a communication network.
  5. 5. A frequency forming system for a converter-based power grid, comprising: a converter type determining module, configured to determine a type of each of converters in a new energy power grid, wherein types of the converters comprises a grid-forming converter and a grid-following converter; a converter quantity counting module, configured to count a number of converters whose converter types are the grid-forming converter; a fixed-frequency control module, configured to allow, when one grid-forming converter is provided, the one grid-forming converter to operate in a fixed-frequency control mode, and determine a frequency outputted by the grid-forming converter based on the fixed-frequency control mode as a frequency of the new energy power grid; and a coordinated control module, configured to allow, when a plurality of grid-forming converters are provided, the grid-forming converters to operate in a coordinated control mode, and determine a frequency outputted by the grid-forming converters based on the coordinated control mode as a frequency of the new energy power grid.
  6. 6 The frequency forming system according to claim 5, wherein the coordinated control module comprises: a determining result obtaining submodule, configured to determine, when the plurality of grid-forming converters are provided, whether there is a communication network among the converters, to obtain a determining result, a master converter selection submodule, configured to select, if the determining result indicates yes, any one of the grid-forming converters as a master converter, allow the master converter to operate in a fixed-frequency control mode, and determine a frequency outputted by the master converter based on the fixed-frequency control mode as a frequency of the new energy power grid; and a frequency droop control submodule, configured to allow the converters to operate in a frequency droop control mode if the determining result indicates no, and determine a frequency outputted by the grid-forming converters based on a droop characteristic curve as a frequency of the new energy power grid.
  7. 7. The frequency forming system according to claim 6, wherein the frequency droop control submodule comprises: a local information acquisition unit, configured to acquire a voltage and a current of each of the converters; an output power calculation unit, configured to calculate output power of each of the converters based on the voltage and the current of each of the converters; and an output power determining unit, configured to determine an output frequency of each of the converters by using a power-frequency droop curve based on the output power of each of the converters.
  8. 8. The frequency forming system according to claim 6, further comprising: a slave converter determining module, configured to determine converters other than the master converter in the new energy power grid as slave converters, wherein information is exchanged between the master converter and the slave converters via a communication network.
GB2212023.2A 2021-08-19 2022-08-17 Frequency forming method and system for converter-based power grid Active GB2611623B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3533996A1 (en) * 2018-02-28 2019-09-04 Siemens Gamesa Renewable Energy A/S Method of starting a wind park
WO2021023356A1 (en) * 2019-08-08 2021-02-11 Mhi Vestas Offshore Wind A/S Providing auxiliary power using offshore wind turbines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3533996A1 (en) * 2018-02-28 2019-09-04 Siemens Gamesa Renewable Energy A/S Method of starting a wind park
WO2021023356A1 (en) * 2019-08-08 2021-02-11 Mhi Vestas Offshore Wind A/S Providing auxiliary power using offshore wind turbines

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GB202212023D0 (en) 2022-09-28
CN113472019A (en) 2021-10-01

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