CN113904365B - Offshore wind power grid-connected system based on IGCT and LCC devices and control method - Google Patents
Offshore wind power grid-connected system based on IGCT and LCC devices and control method Download PDFInfo
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- CN113904365B CN113904365B CN202111143850.3A CN202111143850A CN113904365B CN 113904365 B CN113904365 B CN 113904365B CN 202111143850 A CN202111143850 A CN 202111143850A CN 113904365 B CN113904365 B CN 113904365B
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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]
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Abstract
The present disclosure provides an offshore wind power grid-connected system based on IGCT and LCC devices and a control method, wherein the system comprises: the offshore wind power station comprises an offshore transmitting end converter station and an onshore receiving end converter station connected with the offshore transmitting end converter station, wherein the offshore transmitting end converter station adopts a first converter based on an IGCT current source and a second converter based on an LCC current source and is used for converting alternating current generated by an offshore wind power station into direct current and conveying the direct current to the onshore receiving end converter station; the land receiving end converter station adopts a third converter based on an IGCT current source type for converting direct current transmitted by the marine transmitting end converter station into alternating current and transmitting the alternating current to a land alternating current power grid. The sending end adopts a half control device and a full control device, the LCC thyristor has large capacity, the power electronic device requirement when the full control device is adopted can be reduced, the weight of an offshore platform is further reduced, the offshore wind power low-price sending out is facilitated, the characteristics of full control of the IGCT can be used as a starting source of the LCC side for assisting LCC passive starting, the offshore wind power stable sending out is realized, and the DC fault can be traversed.
Description
Technical Field
The disclosure relates to the technical field of offshore wind power generation, in particular to an offshore wind power grid-connected system based on IGCT and LCC devices and a control method.
Background
Grid-connected delivery of offshore wind power typically employs High Voltage Alternating Current (HVAC) or High Voltage Direct Current (HVDC) transmission. The HVAC technology is mature and simple in structure, but is limited by the sea cable capacitance effect, and is generally only suitable for offshore wind farm access. As the scale development and layout of offshore wind farms gradually goes from offshore to open sea, traditional HVAC technology applications are increasingly experiencing bottlenecks, typically employing High Voltage Direct Current (HVDC) technology.
In the related art, the rectifying side and the inverting side generally adopt voltage source type flexible direct current transmission technology based on insulated gate bipolar transistors (Insulated Gate Bipolar Transistor, IGBT), but the mode has the technical problems of high overall manufacturing cost, large volume and weight of an offshore platform, difficult construction and installation and the like. In addition, when the offshore wind power transmission capacity is large, the single converter structure adopted by the converter station faces the requirements of high voltage level and large current amplitude, and the requirements of offshore core equipment such as direct current submarine cables and converter valves are more severe.
Disclosure of Invention
The application provides an offshore wind power grid-connected system based on IGCT and LCC devices and a control method thereof, and aims to solve one of the technical problems in the related art at least to a certain extent.
An embodiment of a first aspect of the present application provides an offshore wind power grid-connected system based on IGCT devices, including: the offshore wind farm comprises an offshore transmitting end converter station and an onshore receiving end converter station connected with the offshore transmitting end converter station, wherein the offshore transmitting end converter station comprises a first converter based on an IGCT current source and a second converter based on an LCC current source, and the offshore transmitting end converter station is used for converting alternating current generated by an offshore wind farm into direct current and conveying the direct current to the onshore receiving end converter station; the land-based receiving end converter station comprises a third converter based on an IGCT current source, and the third converter is used for converting direct current transmitted by the offshore transmitting end converter station into alternating current and transmitting the alternating current to a land-based alternating current power grid.
In some embodiments, the IGCT current source based first inverter employs a fixed ac bus voltage control strategy and a fixed frequency control strategy, and the LCC current source based second inverter employs a fixed dc current control strategy.
In some embodiments, the IGCT current source based third inverter employs a constant dc current control strategy and an ac bus voltage control strategy.
In some embodiments, the sum of the delivered power of the first and second converters is equal to the received power of the third converter.
In some embodiments, the system further comprises: the first step-up transformer is arranged between the first converter and the offshore wind farm; the second step-up transformer is arranged between the second converter and the offshore wind farm; the first step-up transformer and the second step-up transformer are configured to step-up the alternating current generated by the offshore wind farm.
In some embodiments, the IGCT current source-based first converter and the IGCT current source-based third converter each employ an IGCT series topology.
In some embodiments, the first converter and the third converter respectively comprise three valve arms, each valve arm is formed by connecting a plurality of IGCT series diode structures in series, the number of IGCT in the first converter is related to the transmission power of the first converter, and the number of IGCT in the third converter is related to the receiving power of the third converter.
An embodiment of a second aspect of the present application provides an offshore wind power grid-connected control method, applied to an offshore wind power grid-connected system, where the offshore wind power grid-connected system includes an offshore transmitting-end converter station and a land-based receiving-end converter station, the offshore transmitting-end converter station includes a first converter based on an IGCT current source type and a second converter based on an LCC current source type, the land-based receiving-end converter station includes a third converter based on an IGCT current source type, and the method includes: the method comprises the steps that a first converter for controlling an offshore transmitting end converter station adopts a constant alternating current bus voltage control strategy and a constant frequency control strategy, and a second converter is controlled to adopt a constant direct current control strategy, so that alternating current generated by an offshore wind farm is converted into direct current and is transmitted to an onshore receiving end converter station; and a third converter for controlling the land receiving end converter station adopts a constant direct current control strategy and an alternating current bus voltage control strategy to convert direct current into alternating current and transmit the alternating current to a land alternating current power grid.
In some embodiments, the sum of the delivered power of the first and second converters is equal to the received power of the third converter.
An embodiment of a third aspect of the present application proposes a non-transitory computer-readable storage medium storing computer instructions for causing a computer to execute the offshore wind grid-connected control method disclosed in the embodiment of the present application.
In this embodiment, the offshore end converter station adopts the first converter based on the IGCT current source type and the second converter based on the LCC current source type, so that the ac power generated by the offshore wind farm can be converted into dc power and transmitted to the land end converter station, and the land end converter station adopts the third converter based on the IGCT current source type, so that the dc power transmitted by the offshore end converter station is converted into ac power and transmitted to the land ac power grid. The offshore delivery end adopts the mutual matching of the semi-control device and the full-control device, the characteristic of large capacity of the LCC thyristor can reduce the power electronic device requirement when the full-control device is adopted, further reduce the weight of an offshore platform, be beneficial to realizing the low-price delivery of offshore wind power, and the characteristic of full control of the IGCT can be used as a starting source of the LCC side, assist LCC is passively started, realize the stable delivery of the offshore wind power and can pass through direct current faults. And further solves the technical problems of high overall cost, large volume and weight of an offshore platform, difficult construction and installation and the like of the offshore wind power grid-connected system in the related technology.
Additional aspects and advantages of the disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure.
Drawings
The foregoing and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a topology of an offshore wind grid system provided in accordance with an embodiment of the disclosure;
fig. 2 is a schematic circuit diagram of a control strategy of a first inverter provided according to an embodiment of the disclosure;
fig. 3 is a schematic circuit diagram of a control strategy of a second inverter provided according to an embodiment of the disclosure;
fig. 4 is a schematic circuit diagram of a control strategy of a third inverter provided according to an embodiment of the disclosure;
fig. 5 is a flow chart of a method for offshore wind grid-tie control according to another embodiment of the present disclosure.
Detailed Description
Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present disclosure and are not to be construed as limiting the present disclosure. On the contrary, the embodiments of the disclosure include all alternatives, modifications, and equivalents as may be included within the spirit and scope of the appended claims.
Aiming at the technical problems that the whole manufacturing cost of the offshore wind power grid-connected system is high, the volume and weight of an offshore platform are large, the construction and installation are difficult and the like in the related art in the background art, the technical scheme of the embodiment provides the offshore wind power grid-connected system, and the method is described below with reference to specific embodiments.
Fig. 1 is a schematic diagram of a topology structure of an offshore wind power grid-connected system based on IGCT and LCC devices according to an embodiment of the present disclosure, and as shown in fig. 1, the offshore wind power grid-connected system generally includes an offshore terminal converter station (rectifying side) and an onshore terminal converter station (inverting side), the offshore terminal converter station is connected to an offshore wind farm, the onshore terminal converter station is connected to an onshore ac power grid, and power transmission between the offshore terminal converter station and the onshore terminal converter station is performed through a dc cable.
The offshore end converter station comprises a first converter based on an Integrated Gate thyristor (IGCT) current source and a second converter based on an LCC (line-commutated converter, LCC) current source, wherein the LCC is formed by connecting a plurality of thyristors in series.
Wherein, the alternating current side of the first converter is provided with LC filter devices Lr1 and Cr1 and is connected with a wind power plant, and the direct current side is connected with a smoothing reactor L dc1 The second converter is directly connected with the wind farm. The first converter based on IGCT current source type and the second converter based on LCC current source type can convert alternating current generated by offshore wind farm into direct current (the direct current voltage is U dc ) And transported to an onshore receiver-side converter station.
The land receiving end converter station comprises a third converter based on an IGCT current source, and the alternating current side of the third converter is provided with filter devices Li and Ci for converting direct current transmitted by the sea transmitting end converter station into alternating current and transmitting the alternating current to a land alternating current power grid. Wherein the sum of the transmission power of the first converter and the second converter is equal to the reception power of the third converter.
In some embodiments, a first step-up transformer and a second step-up transformer may be further disposed between the first converter, the second converter and the offshore wind farm, the offshore wind farm is connected to low voltage sides of the first step-up transformer and the second step-up transformer, ac sides of the first converter and the second converter are connected to high voltage sides of the first step-up transformer and the second step-up transformer, and ac generated by the offshore wind farm may be step-up processed through the step-up transformers, thereby being beneficial to improving power transmission efficiency.
In some embodiments, IGCT devices in the IGCT current source-based first and third converters may be arranged in series, that is, the current source converters of IGCTs of embodiments of the present disclosure employ a series topology, for example.
For example, the first converter and the third converter based on the IGCT current source may include three valve arms, respectively, each of the valve arms is formed by connecting a plurality of IGCT serial diode structures in series, and the number of IGCTs in the first converter is related to the transmission power of the first converter, and the number of IGCTs in the third converter is related to the receiving power of the third converter, that is, the number of IGCT devices in the first converter and the third converter is related to the rated power, so that the transmission efficiency may be improved.
It will be appreciated that the above examples are only exemplary topologies of current source converters for IGCTs, and that other topologies may be used in practice without limitation.
In addition, in the second converter based on the LCC current source, a 6-pulse bridge or 12-pulse bridge architecture may be adopted, which is not limited.
In this embodiment, the offshore end converter station adopts the first converter based on the IGCT current source type and the second converter based on the LCC current source type, so that the ac power generated by the offshore wind farm can be converted into dc power and transmitted to the land end converter station, and the land end converter station adopts the third converter based on the IGCT current source type, so that the dc power transmitted by the offshore end converter station is converted into ac power and transmitted to the land ac power grid. The offshore delivery end adopts the mutual matching of the semi-control device and the full-control device, the characteristic of large capacity of the LCC thyristor can reduce the power electronic device requirement when the full-control device is adopted, further reduce the weight of an offshore platform, be beneficial to realizing the low-price delivery of offshore wind power, and the characteristic of full control of the IGCT can be used as a starting source of the LCC side, assist LCC is passively started, realize the stable delivery of the offshore wind power and can pass through direct current faults. And further solves the technical problems of high overall cost, large volume and weight of an offshore platform, difficult construction and installation and the like of the offshore wind power grid-connected system in the related technology.
The offshore converter station adopts a parallel structure of an IGCT and an LCC, the IGCT can be passively started, after the offshore alternating current bus voltage of a transmitting end is established, the LCC is driven to be started, the two are combined, free control of capacity transmission among each other can be realized, the transmission capacity is large, the total number of required devices is far smaller than the IGBT requirement, the light-weight and low-cost design of offshore wind power flexible direct transmission is realized, the onshore receiving end adopts the IGCT, the problem of commutation failure is avoided, and the stability of an onshore power grid is facilitated.
In some embodiments, the IGCT current source based first inverter may employ a fixed ac bus voltage control strategy and a fixed frequency control strategy, and the LCC current source based second inverter employs a fixed dc current control strategy.
Specifically, fig. 2 is a schematic circuit diagram of a control strategy of a first converter according to an embodiment of the present disclosure, as shown in fig. 2, the first converter of an offshore end converter station adopts a fixed ac bus voltage and fixed frequency control mode, establishes an ac voltage with a constant amplitude and frequency for a wind farm, and corresponds to a V0 node with respect to an ac system of the wind farm. Wherein f ACref_r 、U ACref_r Setting values of the constant frequency control strategy and the constant alternating current bus voltage, f AC_r 、U Ac_r For actual measurement of frequency and alternating current voltage of offshore transmitting end converter station, I dref_r 、I qref_r For d, q axis components, I of the alternating current of the first converter of the offshore transmitting end converter station aref_r 、I bref_r 、I cref_r The reference value of the wave is modulated for the alternating current of the first converter of the offshore transmitting converter station.
Fig. 3 is a schematic circuit diagram of a control strategy of a second converter according to an embodiment of the disclosure, as shown in fig. 3, I dcref_r Is the setting value of the second converter constant DC current control strategy, I dc_r Is an actual measurement of the dc current of the second converter.
The third converter of the land-based receiver-side converter station adopts a constant DC current control strategy and an AC bus voltage control strategy, as shown in FIG. 4, wherein I dcref_i Setting a setting value of a DC control strategy for the third converter, U Acref_i Setting value of the voltage of the alternating current bus of the third converter, I dc_i 、U AC_i Is the actual measurement value of the DC current and the AC voltage of the third converter, I dref_i 、I qref_i For d, q axis component, I of third converter AC current of marine transmitting end converter station aref_i 、I bref_i 、I cref_i The reference value of the wave is modulated for the alternating current of the third converter of the offshore transmitting end converter station. Wherein K, P, s is a PI controller (e.g., constant AC bus voltage controller, constant frequency controller, constant DC current controller, constant reactive power controller, constant DC current controller, AC bus voltage controller, etc.).
According to the embodiment of the disclosure, the offshore delivery end adopts the mutual matching of the semi-control device and the full-control device, the requirement of a power electronic device when the full-control device is adopted can be reduced due to the characteristic that the LCC thyristor has large capacity, the weight of an offshore platform is further reduced, the offshore wind power low-price delivery is facilitated, the characteristic that the IGCT is fully controlled can be used as a starting source of the LCC side, the boosting LCC is passively started, the offshore wind power is stably delivered, and the DC fault can be traversed. Fig. 5 is a schematic flow chart of an offshore wind power grid-tie control method provided according to another embodiment of the present disclosure, which may be performed by, for example, an offshore wind power grid-tie control system including an offshore end converter station including a first converter based on IGCT current source type and a second converter based on LCC current source type, and an offshore end converter station including a third converter based on IGCT current source type, as shown in fig. 5, the offshore wind power grid-tie control method includes:
s501: the first converter for controlling the offshore end converter station adopts a constant alternating current bus voltage control strategy and a constant frequency control strategy, and the second converter is controlled to adopt a constant direct current control strategy, so that alternating current generated by the offshore wind farm is converted into direct current and is conveyed to the onshore end converter station.
S502: and the third converter for controlling the land receiving end converter station adopts a constant direct current control strategy and an alternating current bus voltage control strategy to convert direct current into alternating current and transmit the alternating current to a land alternating current power grid.
Specifically, in the embodiment of the disclosure, the offshore end converter station is connected with an offshore wind farm, the land-based end converter station is connected with a land-based alternating current power grid, and power transmission can be performed between the offshore end converter station and the land-based end converter station through a direct current cable. The offshore end converter station can comprise a first converter based on an IGCT current source type and a second converter based on an LCC current source type, and in the process of offshore wind power grid connection, the offshore wind power grid connection control system controls the first converter of the offshore end converter station to adopt a constant alternating current bus voltage control strategy and a constant frequency control strategy, and controls the second converter to adopt a constant direct current control strategy, so that alternating current generated by an offshore wind power plant is converted into direct current and is conveyed to an onshore end converter station.
The land receiving end converter station comprises a third converter based on an IGCT current source, and in the process of carrying out offshore wind power grid connection, the offshore wind power grid connection control system can control the third converter to convert direct current into alternating current by adopting a constant direct current control strategy and an alternating current bus voltage control strategy and convey the alternating current to a land alternating current power grid.
Some embodiments wherein the sum of the delivered power of the first converter and the second converter is equal to the received power of the third converter.
In this embodiment, the offshore end converter station adopts the first converter based on the IGCT current source type and the second converter based on the LCC current source type, so that the ac power generated by the offshore wind farm can be converted into dc power and transmitted to the land end converter station, and the land end converter station adopts the third converter based on the IGCT current source type, so that the dc power transmitted by the offshore end converter station is converted into ac power and transmitted to the land ac power grid. The offshore delivery end adopts the mutual matching of the semi-control device and the full-control device, the characteristic of large capacity of the LCC thyristor can reduce the power electronic device requirement when the full-control device is adopted, further reduce the weight of an offshore platform, be beneficial to realizing the low-price delivery of offshore wind power, and the characteristic of full control of the IGCT can be used as a starting source of the LCC side, assist LCC is passively started, realize the stable delivery of the offshore wind power and can pass through direct current faults. And further solves the technical problems of high overall cost, large volume and weight of an offshore platform, difficult construction and installation and the like of the offshore wind power grid-connected system in the related technology.
According to embodiments of the present disclosure, the present disclosure also provides an electronic device, a readable storage medium and a computer program product.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
It should be noted that in the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (8)
1. An offshore wind grid-connected system based on IGCT and LCC devices, comprising: an offshore terminal converter station, and an onshore receiver terminal converter station connected to the offshore terminal converter station, characterized in that,
the offshore transmitting end converter station comprises a first converter based on an IGCT current source type and a second converter based on an LCC current source type, and is used for converting alternating current generated by an offshore wind farm into direct current and conveying the direct current to the onshore receiving end converter station;
the land receiving end converter station comprises a third converter based on an IGCT current source type, and is used for converting direct current transmitted by the marine sending end converter station into alternating current and transmitting the alternating current to a land alternating current power grid, the first converter based on the IGCT current source type adopts a constant alternating current bus voltage control strategy and a constant frequency control strategy, the second converter based on the LCC current source type adopts a constant direct current control strategy, and the third converter based on the IGCT current source type adopts a constant direct current control strategy and an alternating current bus voltage control strategy.
2. The system of claim 1, wherein a sum of the delivered power of the first and second converters is equal to the received power of the third converter.
3. The system as recited in claim 1, further comprising:
the first step-up transformer is arranged between the first converter and the offshore wind farm;
the second step-up transformer is arranged between the second converter and the offshore wind farm;
the first step-up transformer and the second step-up transformer are configured to step-up the alternating current generated by the offshore wind farm.
4. The system of claim 1, wherein the IGCT current source-based first inverter and the IGCT current source-based third inverter each employ an IGCT series topology.
5. The system of claim 4, wherein the first and third converters each comprise three valve arms, each of the valve arms being formed in series with a number of IGCT series diode structures, and wherein the number of IGCTs in the first converter is related to the delivery power of the first converter and the number of IGCTs in the third converter is related to the receiving power of the third converter.
6. An offshore wind power grid-connected control method applied to an offshore wind power grid-connected system, which is characterized by comprising an offshore transmitting-end converter station and a land receiving-end converter station, wherein the offshore transmitting-end converter station comprises a first converter based on an IGCT current source type and a second converter based on an LCC current source type, and the land receiving-end converter station comprises a third converter based on the IGCT current source type, and the method comprises the following steps:
the first converter controlling the offshore transmitting end converter station adopts a constant alternating current bus voltage control strategy and a constant frequency control strategy, and the second converter is controlled to adopt a constant direct current control strategy, so that alternating current generated by an offshore wind farm is converted into direct current and is transmitted to the onshore receiving end converter station; and
and a third converter for controlling the land receiving end converter station adopts a constant direct current control strategy and an alternating current bus voltage control strategy to convert the direct current into alternating current and convey the alternating current to a land alternating current power grid.
7. The method of claim 6, wherein a sum of the delivered power of the first and second converters is equal to the received power of the third converter.
8. A non-transitory computer readable storage medium storing computer instructions for causing the computer to perform the method of any one of claims 6-7.
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| CN104362662A (en) * | 2014-11-26 | 2015-02-18 | 湖北工业大学 | Topological structure of LCC-VSC type hybrid DC transmission system and starting method of LCC-VSC type hybrid DC transmission system |
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| CN107204626A (en) * | 2017-06-09 | 2017-09-26 | 电子科技大学 | A kind of LCC MMC interlock hybrid bypolar DC transmission system |
| CN112787347A (en) * | 2019-11-11 | 2021-05-11 | 南京南瑞继保电气有限公司 | Online exit circuit, exit method and exit device for hybrid direct current converter valve bank |
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