CN116131334A - Voltage decentralized control method, device, equipment and medium for offshore wind farm - Google Patents
Voltage decentralized control method, device, equipment and medium for offshore wind farm Download PDFInfo
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- CN116131334A CN116131334A CN202310077106.0A CN202310077106A CN116131334A CN 116131334 A CN116131334 A CN 116131334A CN 202310077106 A CN202310077106 A CN 202310077106A CN 116131334 A CN116131334 A CN 116131334A
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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
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
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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
- H02J3/004—Generation forecast, e.g. methods or systems for forecasting future energy generation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- H02J3/50—Controlling the sharing of the out-of-phase component
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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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Abstract
The disclosure provides a voltage dispersion control method, device, equipment and medium for an offshore wind farm. Offshore wind farm comprising at least: the method comprises the steps of: the method comprises the steps of obtaining the maximum reactive power of a fan converter to which a wind turbine generator grid side converter belongs and the maximum reactive power of a flexible-direct system to which an offshore wind power transmitting end converter station belongs, determining a target power demand proportion according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible-direct system, determining a target reactive power setting value of a grid-connected point in an offshore wind power plant, and controlling operation of the offshore wind power transmitting end converter station and the wind turbine generator grid side converter according to the target reactive power setting value and the target power demand proportion, so that the influence of strong randomness, high intermittence and large fluctuation of offshore wind power on operation of the offshore wind power plant can be effectively reduced, and the safety and stability of offshore wind power grid connection are effectively improved.
Description
Technical Field
The disclosure relates to the technical field of new energy power generation, in particular to a voltage decentralized control method, a device, electronic equipment and a storage medium for an offshore wind farm.
Background
Compared with land wind power, the offshore wind power has the unique advantages of stable wind energy resources, no land occupation, good digestion conditions and the like, and at present, the grid-connected mode of offshore wind power output is mainly divided into two main types of high-voltage alternating current transmission and high-voltage direct current transmission, wherein the high-voltage direct current transmission adopts a flexible direct current transmission technology based on a voltage source converter, and the flexible direct current transmission technology is used for effectively isolating an internal alternating current system of a wind power plant from an external large power grid.
In the related technology, the voltage coordination control strategy adopted by the offshore wind power at the offshore grid connection point of the wind turbine generator through the flexible direct system is that the wind turbine generator grid side adopts a constant direct current voltage and constant reactive power control strategy, and the offshore converter station of the flexible direct system adopts a constant alternating current voltage and constant frequency control strategy.
In this way, the reactive power setting value of the wind turbine generator is generally 0, and the grid-connected point bus voltage is all from the flexible system, so that the reactive power adjustment capability of the wind turbine generator cannot be fully exerted.
Disclosure of Invention
The present disclosure aims to solve, at least to some extent, one of the technical problems in the related art.
Therefore, the purpose of the present disclosure is to provide a voltage dispersion control method, a device, an electronic device and a storage medium for an offshore wind farm, which can effectively reduce the influence of strong randomness, high intermittence and large volatility of offshore wind power on the operation of the offshore wind farm, and effectively improve the safety and stability of offshore wind grid connection.
The voltage dispersion control method for an offshore wind farm according to the embodiment of the first aspect of the present disclosure at least includes: the method comprises the steps of: obtaining the maximum reactive power of a fan converter to which a wind turbine generator grid side converter belongs and the maximum reactive power of a flexible-direct system to which an offshore transmitting end converter station belongs, determining a target power demand ratio according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible-direct system, determining a target reactive power setting value of a grid-connected point in an offshore wind power plant, and controlling the operation of the offshore transmitting end converter station and the wind turbine generator grid side converter according to the target reactive power setting value and the target power demand ratio.
According to the voltage dispersion control method for the offshore wind farm, provided by the embodiment of the first aspect, the maximum reactive power of the fan converter of the wind turbine generator grid side converter and the maximum reactive power of the flexible direct system of the offshore wind farm are obtained, the target power demand proportion is determined according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible direct system, the target reactive power setting value of the grid-connected point in the offshore wind farm is determined, and the operation of the offshore wind farm and the wind turbine generator grid side converter is controlled according to the target reactive power setting value and the target power demand proportion, so that the influence of the strong randomness, the high intermittence and the large fluctuation of offshore wind power on the operation of the offshore wind farm can be effectively reduced, and the safety and the stability of offshore wind power grid connection are effectively improved.
The voltage dispersion control device for an offshore wind farm according to the second aspect of the present disclosure includes at least: the device comprises an offshore end-transmitting converter station and a wind turbine generator grid-side converter, and the device comprises: the acquisition module is used for acquiring the maximum reactive power of the fan converter of the wind turbine generator system network side converter and the maximum reactive power of the flexible direct system of the offshore transmitting end converter station; the first determining module is used for determining a target power demand proportion according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible direct system; the second determining module is used for determining a target reactive power setting value of the grid-connected point in the offshore wind power plant; and the control module is used for controlling the operation of the offshore transmitting end converter station and the wind turbine generator grid side converter according to the target reactive power setting value and the target power demand proportion.
According to the voltage dispersion control device for the offshore wind farm, provided by the embodiment of the second aspect of the disclosure, the maximum reactive power of the fan converter of the wind turbine generator grid side converter and the maximum reactive power of the flexible direct system of the offshore wind farm are obtained, the target power demand proportion is determined according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible direct system, the target reactive power setting value of the grid-connected point in the offshore wind farm is determined, and the operation of the offshore wind farm and the wind turbine generator grid side converter is controlled according to the target reactive power setting value and the target power demand proportion, so that the influence of strong randomness, high intermittence and large fluctuation of offshore wind power on the operation of the offshore wind farm can be effectively reduced, and the safety and stability of offshore wind power grid connection are effectively improved.
An embodiment of a third aspect of the present disclosure provides an electronic device, including a memory, a processor, and a computer program stored on the memory and capable of running on the processor, where the processor executes the program to implement a voltage decentralized control method for an offshore wind farm according to the embodiment of the first aspect of the present disclosure.
An embodiment of a fourth aspect of the present disclosure proposes a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a voltage dispersion control method for an offshore wind farm as proposed by an embodiment of the first aspect of the present disclosure.
A fifth aspect embodiment of the present disclosure proposes a computer program product which, when executed by an instruction processor in the computer program product, performs a voltage decentralized control method for an offshore wind farm as proposed by the first aspect embodiment of the present disclosure.
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 flow chart of a voltage dispersion control method for an offshore wind farm according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a system for delivering offshore wind power via flexible and straight delivery according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a determination of a target reactive power setting according to an embodiment of the present disclosure;
FIG. 4 is a flow chart of a voltage dispersion control method for an offshore wind farm according to another embodiment of the present disclosure;
fig. 5 is a schematic diagram of a control flow of an offshore end converter station according to an embodiment of the disclosure;
fig. 6 is a schematic diagram of a control flow of a wind turbine grid-side converter according to an embodiment of the disclosure;
FIG. 7 is a schematic diagram of a voltage dispersion control apparatus for an offshore wind farm according to an embodiment of the present disclosure;
fig. 8 illustrates a block diagram of an exemplary electronic device suitable for use in implementing embodiments 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.
It should be noted that, in the technical scheme of the disclosure, the processes of acquiring, collecting, storing, using, processing and the like of the information all conform to the rules of relevant laws and regulations, and do not violate the popular regulations of the public order.
Fig. 1 is a flow chart of a voltage dispersion control method for an offshore wind farm according to an embodiment of the disclosure.
It should be noted that, the implementation main body of the voltage dispersion control method for the offshore wind farm according to the embodiment is a voltage dispersion control device for the offshore wind farm, and the device may be implemented in a software and/or hardware manner, and the device may be configured in an electronic device, where the electronic device may include, but is not limited to, a terminal, a server, and the like.
The voltage dispersion control method for the offshore wind farm described in the embodiments of the present disclosure may be used in a soft and straight delivery system of offshore wind power, and in order to better understand the voltage dispersion control method for the offshore wind farm disclosed in the embodiments of the present disclosure, a description is first given below of a soft and straight delivery system of offshore wind power to which the embodiments of the present disclosure are applicable.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a soft and straight wind power output system according to an embodiment of the present disclosure, where the soft and straight wind power output system at least includes: the fan converter, wind-powered electricity generation converter includes: wind turbine generator system net side converter and wind turbine generator system side converter, gentle straight system includes: offshore terminal stations and onshore terminal stations.
As shown in fig. 1, the voltage dispersion control method for the offshore wind farm comprises the following steps:
s101: and obtaining the maximum reactive power of the fan converter of the wind turbine generator grid side converter and the maximum reactive power of the flexible direct current system of the offshore transmitting end converter station.
The maximum reactive power of the fan converter of the wind turbine generator grid side converter can be used for representing reactive power adjustment capability of the wind turbine generator grid side converter, and accordingly, the maximum reactive power of the flexible-direct system of the offshore power transmission converter station can be used for representing reactive power adjustment capability of the flexible-direct system.
In the embodiment of the disclosure, the maximum reactive power of a fan converter to which a wind turbine grid-side converter belongs is obtained, the maximum reactive power of a flexible-direct system to which an offshore transmitting-end converter station belongs is obtained, and then the maximum reactive power of the fan converter and the maximum reactive power of the flexible-direct system can be combined to execute a subsequent voltage decentralized control method for an offshore wind farm, and particularly, the subsequent embodiment can be seen.
S102: and determining a target power demand proportion according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible direct system.
The target power demand ratio refers to a power duty ratio coefficient required by each system in the offshore wind farm when the system keeps a good running state, where the power duty ratio coefficient may be, for example, a duty ratio coefficient of power required by an offshore end-transmitting converter station, a duty ratio coefficient of power required by a wind turbine generator grid-side converter, and the like, and is not limited.
According to the embodiment of the disclosure, after the maximum reactive power of the fan converter to which the wind turbine generator grid side converter belongs and the maximum reactive power of the flexible-direct system to which the offshore transmitting end converter station belongs are obtained, the duty ratio coefficient of the power required by the offshore transmitting end converter station can be determined according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible-direct system, the duty ratio coefficient of the power required by the wind turbine generator grid side converter is determined, and the determined duty ratio coefficient of the power required by the offshore transmitting end converter station and the duty ratio coefficient of the power required by the wind turbine generator grid side converter are taken as the target power demand ratio together.
S103: and determining a target reactive power setting value of the grid-connected point in the offshore wind farm.
In the implementation process of the voltage decentralized control method for the offshore wind farm, the power value which is processed according to the preset requirement of the grid-connected point in the offshore wind farm can be called a target reactive power setting value, and the target reactive power setting value can be the reactive power required by the grid-connected point in the offshore wind farm.
In some embodiments, the target reactive power setting value of the grid-connected point in the offshore wind farm may be historical operation data of all systems in the offshore wind farm in a combined mode, the sum of reactive powers required by all systems in the offshore wind farm is determined, and the sum of the reactive powers required by all systems in the offshore wind farm determined as the target reactive power setting value.
In the embodiment of the disclosure, the determining the target reactive power setting value of the grid-connected point in the offshore wind farm may be that a corresponding data transmission interface is provided in advance by the grid-connected point in the offshore wind farm, then, the corresponding data transmission interface may be provided in advance based on the grid-connected point in the offshore wind farm to receive preset reactive power, the reactive power is used as the target reactive power setting value of the grid-connected point in the offshore wind farm, then, the subsequent voltage dispersion control method for the offshore wind farm may be triggered and executed by combining the target reactive power setting value, and particularly, the subsequent embodiment may be referred to.
Alternatively, in some embodiments, the target reactive power setting value of the grid-connected point in the offshore wind farm may be obtained by obtaining a rated voltage value and a measured voltage value of an ac bus in the grid-connected point, and inputting a voltage difference value between the rated voltage value and the measured voltage value into the proportional-integral controller to obtain the target reactive power setting value output by the proportional-integral controller.
In the embodiment of the present disclosure, referring to fig. 3, fig. 3 is a schematic diagram of a determining flow of a target reactive power setting value according to an embodiment of the present disclosure, that is, in the embodiment of the present disclosure, the rated voltage value U of an ac bus in a grid-connected point may be determined first ACref_ r, and determining the measured voltage value U of the alternating current bus in the grid-connected point AC_r Then, can be applied to U ACref_ r and U AC_r Taking the difference to obtain a voltage difference value, and inputting the voltage difference value into a proportional-integral controller to obtain a target reactive power setting value Q required by a grid-connected point output by the proportional-integral controller ref_all 。
S104: and controlling the operation of the offshore transmitting end converter station and the wind turbine generator grid-side converter according to the target reactive power setting value and the target power demand proportion.
According to the embodiment of the disclosure, after the target reactive power setting value and the target power demand proportion of the grid-connected point in the offshore wind farm are determined, the operation of the offshore transmitting-end converter station and the wind turbine generator grid-side converter can be controlled according to the target reactive power setting value and the target power demand proportion.
In some embodiments, the operation of the offshore end converter station and the wind turbine grid side converter is controlled according to the target reactive power setting value and the target power demand ratio, which may be that the operation power of the offshore end converter station is determined according to the target reactive power setting value and the target power demand ratio, the operation power of the wind turbine grid side converter is determined, the operation of the offshore end converter station with the determined operation power of the offshore end converter station is controlled, and the operation of the wind turbine grid side converter with the determined operation power of the wind turbine grid side converter is controlled, which is not limited.
According to the embodiment of the disclosure, the maximum reactive power of the fan converter to which the wind turbine generator grid side converter belongs and the maximum reactive power of the flexible-direct system to which the offshore wind power transmitting end converter station belongs are obtained, the target power demand proportion is determined according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible-direct system, the target reactive power setting value of the grid-connected point in the offshore wind power plant is determined, and the operation of the offshore wind power transmitting end converter station and the wind turbine generator grid side converter is controlled according to the target reactive power setting value and the target power demand proportion, so that the influence of strong randomness, high intermittence and large fluctuation of offshore wind power on the operation of the offshore wind power plant can be effectively reduced, and the safety and stability of offshore wind power grid connection are effectively improved.
Fig. 4 is a flow chart illustrating a voltage dispersion control method for an offshore wind farm according to another embodiment of the present disclosure.
As shown in fig. 4, the voltage dispersion control method for the offshore wind farm includes:
s401: and obtaining the maximum reactive power of the fan converter of the wind turbine generator grid side converter and the maximum reactive power of the flexible direct current system of the offshore transmitting end converter station.
S402: and determining a target power demand proportion according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible direct system.
S403: and determining a target reactive power setting value of the grid-connected point in the offshore wind farm.
The descriptions of S401 to S403 may be specifically referred to the above embodiments, and are not repeated herein.
S404: and determining a first reactive power setting value of the offshore transmitting-end converter station according to the first power demand proportion and the target reactive power setting value.
After determining the target reactive power setting value of the grid-connected point in the offshore wind farm, the embodiment of the disclosure may determine the reactive power setting value of the offshore transmitting-end converter station demand according to the first power demand proportion and the target reactive power setting value, where the reactive power setting value may be referred to as the first reactive power setting value.
Embodiments of the present disclosure may be to multiply the first power demand ratio and the target reactive power setting value (KQ ref_all ) As a first reactive power setting value for the offshore end converter station.
S405: and determining a second reactive power setting value of the wind turbine generator grid side converter according to the second power demand proportion and the target reactive power setting value.
After determining the target reactive power setting value of the grid-connected point in the offshore wind farm, the embodiment of the disclosure may determine the reactive power setting value of the grid-side converter demand of the wind turbine according to the first power demand proportion and the target reactive power setting value, where the reactive power setting value may be referred to as a second reactive power setting value.
Embodiments of the present disclosure may be a product ((1-K) Q) of the second power demand ratio and the target reactive power setting value after determining the second power demand ratio (1-K) ref_all ) Second reactive power setting value used as grid-side converter of wind turbine generator。
S406: and controlling the operation of the offshore transmitting-end converter station according to the first setting value of the passive power.
The disclosed embodiments provide for determining a first active power setting (KQ ref_all ) And then, according to the first passive power setting value, controlling the operation of the offshore transmitting-end converter station.
In some embodiments, the operation of the offshore end converter station may be controlled according to the first setting value of the reactive power, so as to monitor the operation state of the offshore end converter station, so as to ensure that the offshore end converter station can perform the operation of the first setting value of the reactive power (KQ ref_all ) And (5) running.
Optionally, in some embodiments, a rated frequency value, a measured frequency value, and a first reactive power measured value of the offshore end converter station are determined, a frequency difference value between the rated frequency value and the measured frequency value is input to the frequency controller, so as to obtain a first component current value of the offshore end converter station output by the frequency controller, a first power difference value between the first reactive power set value and the first reactive power measured value is input to the reactive power controller, so as to obtain a second component current value of the offshore end converter station output by the reactive power controller, and then the first component current value and the second component current value are input to the inner loop current controller, so as to obtain a first operating voltage value of the offshore end converter station output by the inner loop current controller, and the offshore end converter station is controlled to operate at the first operating voltage value.
In the embodiment of the present disclosure, referring to fig. 5, fig. 5 is a schematic diagram of a control flow of an offshore end converter station according to an embodiment of the present disclosure, which may be to determine a rated frequency value f of the offshore end converter station ACref_r And measuring the frequency value f AC_r And for the rated frequency value f ACref_r And measuring the frequency value f AC_r Taking the difference to obtain a frequency difference between the rated frequency value and the measured frequency value, and inputting the frequency difference into a frequency controller to obtain a first component current value (d-axis component current value I dref_r )。
After that, the offshore end transfer can be determinedFirst passive power measurement Q of a flow station r And to KQ ref_all And Q r Taking the difference to determine a first power difference between the rated frequency value and the measured frequency value, and inputting the first power difference into the reactive power controller to obtain a second component current value (q-axis component current value I) of the offshore end converter station output by the reactive power controller qref_r ) Then the first component current value I dref_r And a second component current value I qref_r Is input into the inner loop current controller to obtain a first operation voltage value (three-phase alternating current voltage modulation wave reference value U of the offshore end converter station aref_r 、U bref_r 、U cref_r ) And then controlling the offshore transmitting end converter station to operate at a first operating voltage value.
S407: and controlling the running of the grid-side converter of the wind turbine according to the second reactive power setting value.
The embodiment of the disclosure determines a second reactive power setting ((1-K) Q) ref_all ) And then, according to the second reactive power setting value, controlling the running of the wind turbine grid-side converter.
In some embodiments, the controlling the operation of the wind turbine grid-side converter according to the second reactive power setting value may be monitoring the operation state of the wind turbine grid-side converter to ensure that the wind turbine grid-side converter can perform the second reactive power setting value ((1-K) Q) ref_all ) And (5) running.
Optionally, in some embodiments, according to the second reactive power setting value, the operation of the wind turbine grid-side converter may be controlled by determining a rated dc voltage value, a measured dc voltage value, and a second reactive power measurement value of the wind turbine grid-side converter, inputting a dc voltage difference value between the rated dc voltage value and the measured dc voltage value into the dc voltage controller, so as to obtain a third component current value of the wind turbine grid-side converter output by the dc voltage controller, inputting a second power difference value between the second reactive power setting value and the second reactive power measurement value into the reactive power controller, so as to obtain a fourth component current value of the wind turbine grid-side converter output by the reactive power controller, and inputting the third component current value and the fourth component current value into the inner ring current controller, so as to obtain a second operation voltage value of the wind turbine grid-side converter output by the inner ring current controller, and then controlling the wind turbine grid-side converter to operate with the second operation voltage value.
In the embodiment of the disclosure, referring to fig. 6, fig. 6 is a schematic control flow diagram of a wind turbine grid-side converter according to an embodiment of the disclosure, which may be used for determining a rated dc voltage value U of the wind turbine grid-side converter dcref Measuring DC voltage value U dc And for rated DC voltage value U dcref And measuring the DC voltage value U dc The difference is made to determine a direct current voltage difference value between a rated direct current voltage value and a measured direct current voltage value, and then the direct current voltage difference value is input into a direct current voltage controller to obtain a third component current value (d-axis component current value I) of the wind turbine grid-side converter output by the direct current voltage controller dref_i )。
Then, a second reactive power measurement Q of the wind turbine grid-side converter can be determined Ac And for (1-K) Q ref_all And Q Ac The difference is made to determine a second power difference value, and the second power difference value is input into the reactive power controller to obtain a fourth component current value (q-axis component current value I) of the wind turbine grid-side converter output by the reactive power controller qref_i ) And then I is carried out dref_i And I qref_i The first operating voltage value and the second operating voltage value are input into the inner ring current controller together to obtain a second operating voltage value (three-phase alternating voltage modulation wave reference value U) of the wind turbine generator grid-side converter output by the inner ring current controller aref_i 、U bref_i 、U cref_i ) And then controlling the grid-side converter of the wind turbine to operate at a second operating voltage value.
According to the embodiment of the disclosure, the maximum reactive power of the fan converter to which the wind turbine generator grid-side converter belongs and the maximum reactive power of the flexible direct system to which the offshore transmitting-end converter belongs are obtained, the target power demand proportion is determined according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible direct system, then the target reactive power setting value of the grid-connected point in the offshore wind farm is determined, then the first reactive power setting value of the offshore transmitting-end converter is determined according to the first power demand proportion and the target reactive power setting value, the second reactive power setting value of the wind turbine generator grid-side converter is determined according to the second power demand proportion and the target reactive power setting value, then the operation of the offshore transmitting-end converter is controlled according to the first reactive power setting value, and the operation of the wind turbine generator grid-side converter is controlled according to the second reactive power setting value.
Fig. 7 is a schematic structural diagram of a voltage dispersion control apparatus for an offshore wind farm according to an embodiment of the present disclosure.
Offshore wind farm comprising at least: an offshore end-feeding converter station and a wind turbine generator grid-side converter.
As shown in fig. 7, the voltage dispersion control apparatus 70 for an offshore wind farm includes:
the obtaining module 701 is configured to obtain a maximum reactive power of a fan converter to which the wind turbine grid-side converter belongs and a maximum reactive power of a flexible-direct system to which an offshore transmitting-end converter station belongs;
a first determining module 702, configured to determine a target power demand ratio according to a maximum reactive power of the fan converter and a maximum reactive power of the flexible system;
a second determining module 703, configured to determine a target reactive power setting value of a grid-connected point in the offshore wind farm;
and the control module 704 is used for controlling the operation of the offshore transmitting end converter station and the wind turbine generator network side converter according to the target reactive power setting value and the target power demand proportion.
In some embodiments of the present disclosure, the first determining module 702 further includes:
determining a first power demand proportion of the offshore transmitting-end converter station according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible-direct system; or alternatively
Determining a second power demand ratio of the wind turbine generator grid-side converter according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible direct system, wherein the sum of the first power demand ratio and the second power demand ratio is 1;
the first power demand ratio and the second power demand ratio are taken together as a target power demand ratio.
In some embodiments of the present disclosure, the control module 704 is further configured to:
determining a first reactive power setting value of the offshore transmitting end converter station according to the first power demand proportion and the target reactive power setting value;
determining a second reactive power setting value of the wind turbine generator grid side converter according to the second power demand proportion and the target reactive power setting value;
controlling the operation of the offshore transmitting end converter station according to the first passive power setting value;
and controlling the running of the grid-side converter of the wind turbine according to the second reactive power setting value.
In some embodiments of the present disclosure, the control module 704 is further configured to:
determining a rated frequency value, a measured frequency value and a first passive power measured value of the offshore transmitting end converter station;
inputting a frequency difference value between a rated frequency value and a measured frequency value into a frequency controller to obtain a first component current value of the offshore end converter station output by the frequency controller;
Inputting a first power difference value between the first setting value of the reactive power and the first measuring value of the reactive power into the reactive power controller to obtain a second component current value of the offshore transmitting-end converter station output by the reactive power controller;
inputting the first component current value and the second component current value into an inner ring current controller to obtain a first operating voltage value of the offshore end converter station output by the inner ring current controller;
the offshore terminal converter station is controlled to operate at a first operating voltage value.
In some embodiments of the present disclosure, the control module 704 is further configured to:
determining a rated direct current voltage value, a measured direct current voltage value and a second reactive power measured value of the grid-side converter of the wind turbine generator;
inputting a direct current voltage difference value between the rated direct current voltage value and the measured direct current voltage value into a direct current voltage controller to obtain a third component current value of the wind turbine grid-side converter output by the direct current voltage controller;
inputting a second power difference value between a second reactive power setting value and a second reactive power measured value into the reactive power controller to obtain a fourth component current value of the wind turbine grid-side converter output by the reactive power controller;
Inputting the third component current value and the fourth component current value into an inner ring current controller to obtain a second running voltage value of the wind turbine generator network side converter output by the inner ring current controller;
and controlling the grid-side converter of the wind turbine to operate at a second operating voltage value.
In some embodiments of the present disclosure, the second determining module 703 is further configured to:
acquiring a rated voltage value and a measured voltage value of an alternating current bus in a grid-connected point;
and inputting the voltage difference value of the rated voltage value and the measured voltage value into the proportional-integral controller to obtain a target reactive power setting value output by the proportional-integral controller.
The present disclosure also provides a voltage dispersion control apparatus for an offshore wind farm corresponding to the voltage dispersion control method for an offshore wind farm provided by the embodiments of fig. 1 to 6 described above, and since the voltage dispersion control apparatus for an offshore wind farm provided by the embodiments of the present disclosure corresponds to the voltage dispersion control method for an offshore wind farm provided by the embodiments of fig. 1 to 6 described above, the implementation of the voltage dispersion control method for an offshore wind farm is also applicable to the voltage dispersion control apparatus for an offshore wind farm provided by the embodiments of the present disclosure, which will not be described in detail in the embodiments of the present disclosure.
In the embodiment, the maximum reactive power of the fan converter to which the wind turbine generator grid side converter belongs and the maximum reactive power of the flexible system to which the offshore wind power transmitting end converter station belongs are obtained, the target power demand proportion is determined according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible system, the target reactive power setting value of the grid-connected point in the offshore wind power plant is determined, and the operation of the offshore wind power transmitting end converter station and the wind turbine generator grid side converter is controlled according to the target reactive power setting value and the target power demand proportion, so that the influence of strong randomness, high intermittence and large fluctuation of offshore wind power on the operation of the offshore wind power plant can be effectively reduced, and the safety and stability of offshore wind power grid connection are effectively improved.
In order to achieve the above embodiments, the present disclosure further proposes an electronic device including: the voltage distribution control method for the offshore wind farm comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the voltage distribution control method for the offshore wind farm according to the previous embodiment of the disclosure.
To achieve the above-described embodiments, the present disclosure also proposes a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a voltage dispersion control method for an offshore wind farm as proposed by the foregoing embodiments of the present disclosure.
To achieve the above embodiments, the present disclosure also proposes a computer program product which, when executed by an instruction processor in the computer program product, performs a voltage dispersion control method for an offshore wind farm as proposed by the previous embodiments of the present disclosure.
Fig. 8 illustrates a block diagram of an exemplary electronic device suitable for use in implementing embodiments of the present disclosure. The electronic device shown in fig. 8 is merely an example, and should not impose any limitations on the functionality and scope of use of embodiments of the present disclosure.
As shown in fig. 8, the electronic device is in the form of a general purpose computing device. Components of an electronic device may include, but are not limited to: one or more processors or processing units 16, a system memory 28, a bus 18 that connects the various system components, including the system memory 28 and the processing units 16.
Electronic devices typically include a variety of computer system readable media. Such media can be any available media that can be accessed by the electronic device and includes both volatile and nonvolatile media, removable and non-removable media.
Although not shown in fig. 8, a magnetic disk drive for reading from and writing to a removable non-volatile magnetic disk (e.g., a "floppy disk"), and an optical disk drive for reading from or writing to a removable non-volatile optical disk (e.g., a compact disk read only memory (Compact Disc Read Only Memory; hereinafter CD-ROM), digital versatile read only optical disk (Digital Video Disc Read Only Memory; hereinafter DVD-ROM), or other optical media) may be provided. In such cases, each drive may be coupled to bus 18 through one or more data medium interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to carry out the functions of the various embodiments of the disclosure.
A program/utility 40 having a set (at least one) of program modules 42 may be stored in, for example, memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment. Program modules 42 generally perform the functions and/or methods in the embodiments described in this disclosure.
The electronic device may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), with one or more devices that enable a user to interact with the electronic device, and/or with any device (e.g., network card, modem, etc.) that enables the electronic device to communicate with one or more other computing devices. Such communication may occur through an input/output (I/O) interface 22. And the electronic device may also communicate with one or more networks, such as a local area network (Local Area Network; hereinafter: LAN), a wide area network (Wide Area Network; hereinafter: WAN) and/or a public network, such as the Internet, via the network adapter 20. As shown, the network adapter 20 communicates with other modules of the electronic device over the bus 18. It should be appreciated that although not shown, other hardware and/or software modules may be used in connection with an electronic device, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.
The processing unit 16 executes various functional applications and data processing by running programs stored in the system memory 28, for example, implementing the voltage dispersion control method for an offshore wind farm mentioned in the foregoing embodiment.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any adaptations, uses, or adaptations of the disclosure following the general principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
It should be noted that in the description of the present disclosure, 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 disclosure, 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 disclosure 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 embodiments of the present disclosure.
It should be understood that portions of the present disclosure 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.
Furthermore, each functional unit in the embodiments of the present disclosure 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 disclosure. 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.
Although embodiments of the present disclosure have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the present disclosure, 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 present disclosure.
Claims (14)
1. A voltage dispersion control method for an offshore wind farm, the offshore wind farm comprising at least: the method comprises the following steps of:
obtaining the maximum reactive power of a fan converter to which the wind turbine grid-side converter belongs and the maximum reactive power of a flexible-direct system to which the offshore transmitting-end converter station belongs;
determining a target power demand proportion according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible direct system;
determining a target reactive power setting value of a grid-connected point in the offshore wind farm;
and controlling the offshore transmitting end converter station and the wind turbine generator network side converter to operate according to the target reactive power setting value and the target power demand proportion.
2. The method of claim 1, wherein said determining a target power demand ratio based on a maximum reactive power of the fan converter and a maximum reactive power of the soft-direct system comprises:
Determining a first power demand proportion of the offshore transmitting-end converter station according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible direct system; or alternatively
Determining a second power demand ratio of the wind turbine grid-side converter according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible direct current system, wherein the sum of the first power demand ratio and the second power demand ratio is 1;
and taking the first power demand proportion and the second power demand proportion as the target power demand proportion.
3. The method of claim 2, wherein said controlling operation of said offshore terminal converter station and said wind turbine grid side converter based on said target reactive power setting and said target power demand ratio comprises:
determining a first reactive power setting value of the offshore transmitting end converter station according to the first power demand proportion and the target reactive power setting value;
determining a second reactive power setting value of the wind turbine grid-side converter according to the second power demand proportion and the target reactive power setting value;
Controlling the operation of the offshore transmitting end converter station according to the first passive power setting value;
and controlling the running of the wind turbine generator grid side converter according to the second reactive power setting value.
4. A method according to claim 3, wherein said controlling operation of said offshore terminal converter station in accordance with said first reactive power setting value comprises:
determining a rated frequency value, a measured frequency value and a first passive power measured value of the offshore transmitting end converter station;
inputting a frequency difference value between the rated frequency value and the measured frequency value into a frequency controller to obtain a first component current value of the offshore end converter station output by the frequency controller;
inputting a first power difference value between the first setting value of the passive power and the first measuring value of the passive power into a reactive power controller to obtain a second component current value of the offshore transmitting-end converter station output by the reactive power controller;
inputting the first component current value and the second component current value into an inner loop current controller to obtain a first operating voltage value of the offshore end converter station output by the inner loop current controller;
And controlling the offshore transmitting end converter station to operate at the first operating voltage value.
5. A method according to claim 3, wherein said controlling operation of said wind turbine grid side converter in accordance with said second reactive power setting value comprises:
determining a rated direct current voltage value, a measured direct current voltage value and a second reactive power measured value of the wind turbine grid-side converter;
inputting a direct current voltage difference value between the rated direct current voltage value and the measured direct current voltage value into a direct current voltage controller to obtain a third component current value of the wind turbine grid-side converter output by the direct current voltage controller;
inputting a second power difference value between the second reactive power setting value and the second reactive power measured value into the reactive power controller to obtain a fourth component current value of the wind turbine grid-side converter output by the reactive power controller;
inputting the third component current value and the fourth component current value into the inner ring current controller to obtain a second running voltage value of the wind turbine grid-side converter output by the inner ring current controller;
And controlling the wind turbine grid side converter to operate at the second operation voltage value.
6. The method of claim 1, wherein the determining a target reactive power setting for a grid-tie point in the offshore wind farm comprises:
acquiring a rated voltage value and a measured voltage value of an alternating current bus in the grid-connected point;
and inputting the voltage difference value of the rated voltage value and the measured voltage value into a proportional-integral controller to obtain the target reactive power setting value output by the proportional-integral controller.
7. A voltage dispersion control device for an offshore wind farm, the offshore wind farm comprising at least: an offshore terminal converter station and wind turbine grid side converter, the apparatus comprising:
the acquisition module is used for acquiring the maximum reactive power of the fan converter of the wind turbine generator system network side converter and the maximum reactive power of the flexible direct system of the offshore transmitting end converter station;
the first determining module is used for determining a target power demand proportion according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible direct system;
the second determining module is used for determining a target reactive power setting value of the grid-connected point in the offshore wind farm;
And the control module is used for controlling the offshore transmitting end converter station and the wind turbine generator grid-side converter to operate according to the target reactive power setting value and the target power demand proportion.
8. The apparatus of claim 7, wherein the first determination module is further for:
determining a first power demand proportion of the offshore transmitting-end converter station according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible direct system; or alternatively
Determining a second power demand ratio of the wind turbine grid-side converter according to the maximum reactive power of the fan converter and the maximum reactive power of the flexible direct current system, wherein the sum of the first power demand ratio and the second power demand ratio is 1;
and taking the first power demand proportion and the second power demand proportion as the target power demand proportion.
9. The apparatus of claim 8, wherein the control module is further to:
determining a first reactive power setting value of the offshore transmitting end converter station according to the first power demand proportion and the target reactive power setting value;
determining a second reactive power setting value of the wind turbine grid-side converter according to the second power demand proportion and the target reactive power setting value;
Controlling the operation of the offshore transmitting end converter station according to the first passive power setting value;
and controlling the running of the wind turbine generator grid side converter according to the second reactive power setting value.
10. The apparatus of claim 9, wherein the control module is further to:
determining a rated frequency value, a measured frequency value and a first passive power measured value of the offshore transmitting end converter station;
inputting a frequency difference value between the rated frequency value and the measured frequency value into a frequency controller to obtain a first component current value of the offshore end converter station output by the frequency controller;
inputting a first power difference value between the first setting value of the passive power and the first measuring value of the passive power into a reactive power controller to obtain a second component current value of the offshore transmitting-end converter station output by the reactive power controller;
inputting the first component current value and the second component current value into an inner loop current controller to obtain a first operating voltage value of the offshore end converter station output by the inner loop current controller;
and controlling the offshore transmitting end converter station to operate at the first operating voltage value.
11. The apparatus of claim 9, wherein the control module is further to:
determining a rated direct current voltage value, a measured direct current voltage value and a second reactive power measured value of the wind turbine grid-side converter;
inputting a direct current voltage difference value between the rated direct current voltage value and the measured direct current voltage value into a direct current voltage controller to obtain a third component current value of the wind turbine grid-side converter output by the direct current voltage controller;
inputting a second power difference value between the second reactive power setting value and the second reactive power measured value into the reactive power controller to obtain a fourth component current value of the wind turbine grid-side converter output by the reactive power controller;
inputting the third component current value and the fourth component current value into the inner ring current controller to obtain a second running voltage value of the wind turbine grid-side converter output by the inner ring current controller;
and controlling the wind turbine grid side converter to operate at the second operation voltage value.
12. The apparatus of claim 7, wherein the second determination module is further for:
Acquiring a rated voltage value and a measured voltage value of an alternating current bus in the grid-connected point;
and inputting the voltage difference value of the rated voltage value and the measured voltage value into a proportional-integral controller to obtain the target reactive power setting value output by the proportional-integral controller.
13. An electronic device, comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-6.
14. A non-transitory computer readable storage medium storing computer instructions for causing the computer to perform the method of any one of claims 1-6.
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| CN202310077106.0A CN116131334A (en) | 2023-01-16 | 2023-01-16 | Voltage decentralized control method, device, equipment and medium for offshore wind farm |
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| CN202310077106.0A CN116131334A (en) | 2023-01-16 | 2023-01-16 | Voltage decentralized control method, device, equipment and medium for offshore wind farm |
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