CN113972689A - Power control method for DR-MMC hybrid direct current sending system of offshore wind power - Google Patents
Power control method for DR-MMC hybrid direct current sending system of offshore wind power Download PDFInfo
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/22—Current control, e.g. using a current control loop
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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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Abstract
The invention provides a power control method of an offshore wind power DR-MMC mixed direct current sending system, which comprises the steps of obtaining parameter data of the offshore wind power DR-MMC mixed direct current sending system; obtaining an active power distribution result of the MMC and the DR according to the obtained parameter data and a preset control model; in the preset control model, the effective value of the alternating-current side bus line voltage is the sum of the product of the droop coefficient and the MMC output power and the d-axis alternating-current voltage reference value; according to the invention, a power droop link is added to the voltage reference given value of the outer ring of the d-axis control quantity, so that the reasonable distribution of active power between the DR and the MMC at the sending end is realized, the condition of power reverse transmission caused by sudden drop of wind speed is avoided, and the economical efficiency of system operation is improved.
Description
Technical Field
The invention relates to the technical field of wind power control, in particular to a power control method of an offshore wind power DR-MMC mixed direct current sending system.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The offshore wind power direct current sending scheme based on uncontrolled Diode Rectification (DR) has the advantages of small volume, low cost and simple operation control, and becomes one of the most competitive alternative schemes in the future. However, the DR scheme requires that the ac side of the offshore wind farm has passive operation capability, and the start-up process requires an ac return line, an energy storage device or a start-up power supply.
The offshore distance of the open sea wind power plant is generally more than 100km, and the investment and the volume of a platform can be reduced by adopting a DR-MMC parallel sending mode. The wind turbine generator system considers a 66kV convergence mode, so that the space requirement of an offshore platform is further reduced, and the output topology is shown in figure 1.
The inventor finds that when a DR-MMC parallel system operates, due to the fact that voltage of a sending end alternating current system is too high, DR direct current sending power exceeds power of a wind power plant, the phenomenon that MMC (Multilevel Modular Converter, MMC) sends active power to the wind power plant side is prone to occurring, system loss is increased, the DR-MMC parallel system belongs to an unreasonable active power sending mode, and the DR-MMC parallel system is to be avoided.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a power control method of an offshore wind power DR-MMC mixed direct current sending system, wherein a power droop link is added in a voltage reference given value of an outer ring of a d-axis control quantity, so that the reasonable distribution of active power between a sending end DR and an MMC is realized, the power reverse sending condition caused by sudden drop of wind speed is avoided, and the economical efficiency of system operation is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a power control method of an offshore wind power DR-MMC mixed direct current sending system in a first aspect.
A power control method for an offshore wind power DR-MMC mixed direct current sending system comprises the following processes:
acquiring parameter data of an offshore wind power DR-MMC mixed direct current sending system;
obtaining an active power distribution result of the MMC and the DR according to the obtained parameter data and a preset control model;
in the preset control model, the effective value of the alternating-current side bus voltage is the sum of the product of the droop coefficient and the MMC output power and the d-axis alternating-current voltage reference value.
Furthermore, the product of the number of DR units which is 1.35 times of the number of DR units and the transformation ratio of the DR transformer is a first variable, the ratio of the shore equivalent direct current voltage to the first variable is a first voltage, and the reference value of the d-axis alternating current voltage is smaller than or equal to the first voltage.
Further, the output power of the MMC is: the difference value of the first voltage and the d-axis alternating voltage reference value is then compared with the droop coefficient.
Further, the output current of the offshore wind power DR-MMC mixed direct current sending system is the sum of the output current of the MMC direct current side and the output current of the DR direct current side;
the output power of the offshore wind power DR-MMC mixed direct current sending system is the sum of the output power of the MMC direct current side and the output power of the DR direct current side.
Furthermore, the difference value between the voltage on the DR direct current side and the voltage on the MMC direct current side is the product of the output current on the DR direct current side and the resistance values of the connecting cable and the smoothing reactor.
Further, if the output current of the MMC dc side and the output current of the DR dc side both use the sending direction as positive, the differential mode component of the dc current is: the difference value of the DR direct current side output current and the MMC direct current side output current is 0.5 times.
Further, if the output current of the MMC dc side and the output current of the DR dc side both use the sending direction as positive, the common mode component of the dc current is: and the sum of the DR direct-current side output current and the MMC direct-current side output current is 0.5 times.
The invention provides a power control system of an offshore wind power DR-MMC hybrid direct current sending-out system in a second aspect.
A power control system of an offshore wind power DR-MMC mixed direct current sending system comprises:
a data acquisition module configured to: acquiring parameter data of an offshore wind power DR-MMC mixed direct current sending system;
a power distribution module configured to: obtaining an active power distribution result of the MMC and the DR according to the obtained parameter data and a preset control model;
in the preset control model, the effective value of the alternating-current side bus voltage is the sum of the product of the droop coefficient and the MMC output power and the d-axis alternating-current voltage reference value.
A third aspect of the present invention provides a computer readable storage medium having stored thereon a program which, when being executed by a processor, carries out the steps of the method for controlling power of an offshore wind power DR-MMC hybrid dc-dc transmission system according to the first aspect of the present invention.
A fourth aspect of the present invention provides an electronic device, comprising a memory, a processor and a program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for controlling the power of the offshore wind power DR-MMC hybrid dc transmission system according to the first aspect of the present invention when executing the program.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the method, the system, the medium or the electronic equipment, the power droop link is added in the voltage reference given value of the outer ring of the d-axis control quantity, so that the reasonable distribution of the active power between the DR and the MMC at the sending end is realized, the power reverse-sending condition caused by the sudden drop of the wind speed is avoided, and the economical efficiency of system operation is improved.
2. Compared with the original passive V/F control, the method, the system, the medium or the electronic equipment provided by the invention have the main difference that the improved control strategy is mainly characterized in that the voltage reference given value of the outer ring of the d-axis control quantity comprises a power droop link, so that the effective adjustment of the voltage on the alternating current side is realized when the transmission power of the wind power plant changes.
Advantages of additional aspects of the invention 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 invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic diagram of an offshore wind power DR-MMC parallel direct current output topology provided in the background art.
Fig. 2 is a simplified analysis diagram of the DR-MMC offshore wind power delivery system provided in embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of an improved MMC passive control strategy of the parallel hybrid-egress system according to embodiment 1 of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example 1:
the embodiment 1 of the invention provides a power control method of an offshore wind power DR-MMC mixed direct current sending system, which comprises the following processes:
acquiring parameter data of an offshore wind power DR-MMC mixed direct current sending system;
obtaining an active power distribution result of the MMC and the DR according to the obtained parameter data and a preset control model;
in the preset control model, the effective value of the alternating-current side bus voltage is the sum of the product of the droop coefficient and the MMC output power and the d-axis alternating-current voltage reference value.
Specifically, the method comprises the following steps:
in order to further reduce the filter and reactive compensation requirements of the offshore platform, the DR adopts a 24-pulse scheme based on a phase-shifting transformer; MMC employs a conventional half-bridge sub-module (HBSM) based scheme. Because DR operation brings characteristic subharmonic to AC and DC sides, the filtering of characteristic frequency components is realized by adopting a double-tuned filter scheme, and certain reactive compensation equipment is equipped.
Considering that the power factor of DR depends on the angle between the valve-side fundamental current wave and the fundamental voltage wave, it can be expressed by the following approximate formula:
in the formula: α represents a power factor angle; μ is the commutation overlap angle. Considering the action of the smoothing reactor, assuming that the direct current is constant, the power factor angle is about one half of the commutation overlap angle, and the expression of μ is:
in the formula: xTThe equivalent reactance is a converter transformer; u shape1The effective value of the fundamental line voltage of the valve side open circuit; i isDCIs a direct current.
The alternating current change process in the phase change process is approximate to linearity, and the DR direct current side voltage U is formed by multiple unitsDC_DRThe following relationship is satisfied:
ignoring the commutation process effect of the second term, there are:
in the formula: n is the number of DR units, and the case of n being 1 corresponds to a 6-ripple DR converter whose dc voltage is approximately equal to 1.35 times the valve-side ac voltage. Therefore, for a completely uncontrollable DR converter, the voltage on the dc side of the DR converter needs to be changed by changing the voltage on the ac side, so as to change the transmitted dc power.
For the DR sending scheme, the main difficulties currently exist include that the alternating voltage of the passive system is difficult to establish, and the system needs to rely on a starting power supply for starting. In order to effectively solve the problems and fully utilize the respective advantages of the MMC and the DR, the sending end is combined with the MMC and the DR to form a mixed direct current parallel sending system, and the mixed direct current parallel sending system becomes one of feasible schemes of a future open sea wind power sending system.
Considering that a sending end MMC is in an operation interval range during steady-state operation, a V/F control mode is adopted and can be regarded as a balance node (V theta node) for load flow calculation; the voltage of the direct current side of the receiving end flexible direct-current station is kept constant and is regarded as an ideal direct-current voltage source; the offshore wind power is regarded as an equivalent current source with variable output power, and the simplified schematic diagram of the alternating current and direct current system obtained after the whole system is correspondingly simplified is shown in fig. 2.
When the effective value of the grid-connected point line voltage of the offshore wind power plant is U1Then, the DR dc side outlet voltage is obtained by equation (4), and the following relationship is satisfied according to the electrical quantity and direction defined in the figure:
considering the existence of smoothing reactance and the DC side connection line impedance, the MMC DC side outlet voltage U is resulted when DR transmits powerDC_MMCAnd DR direct current side outlet voltage UDC_DRThere is a difference. If the MMC and DR output DC current are defined to have the sending direction as positive, the differential mode component of the DC current is IdiffThe common mode component is IcomThe following relationship is satisfied:
the difference value between the DR direct current side voltage and the MMC direct current side voltage satisfies the following conditions:
UDC_DR-UDC_MMC＝RIDC_DR (7)
in the formula: r is the resistance of the connecting cable and the smoothing reactor, the numerical value is small, and the combined type (4) can obtain:
in the formula: k is a radical ofTFor DR transformer transformation ratio, in a known DC current IDCThe differential mode current component expression is:
in the formula: rLThe equivalent resistance of the cables which are parallelly connected and sent out of the system. When the total transmission power PDCConstant, differential mode component IdiffFollowing AC voltage U1Rises when rising, when the differential mode component IdiffGreater than the common mode component IcomIn time, sending end MMC direct current has:
IDC_MMC＝Icom-Idiff<0 (10)
the fact that the voltage of the sending end alternating current system is too high at the moment, the DR direct current sending power exceeds the power of the wind power plant, the phenomenon that the MMC sends active power to the wind power plant side in a backward mode occurs, system loss is increased, the method belongs to an unreasonable active power sending mode, and the method is to be avoided.
From the above analysis, it is found that, if the ac-side bus voltage is maintained constant when the power of the offshore wind farm is large, the dc voltage on the DR outlet side is almost constant. Considering that the output voltage of the DC side of the marine MMC is increased due to the increase of the transmission active power, the DR sending power is reduced, and most of the active power is transmitted by the MMC. The mixed system of sending out accessible MMC control alternating current side voltage mode coordinates send end DR and MMC active output to make send end DR and MMC all be in the rectification running state, reduce the running loss and avoid the condition that send end MMC active power was sent backward appearing.
For a DR parallel MMC marine wind power island sending-out scene, if a power grid follow-up control strategy of a wind power generator set is kept unchanged, the island operation capacity of the MMC needs to be used as a support power supply to operate. According to the embodiment, on the basis of analyzing and explaining an active power distribution mechanism and an MMC reverse power phenomenon in a DR-MMC parallel connection sending scene, a coordination control strategy between the MMC and the DR is given, and the reasonable distribution of active power is realized, so that the MMC active reverse power phenomenon is effectively avoided.
Wind farm transmission power is PWFThe DR dc side voltage can be approximately expressed by equation (4). Neglecting the converter loss, the receiving end MMC DC voltage is UDCThen, the voltage amplitude U of the bus at the AC side of the sending end is adjusted1The active power coordination control of the parallel connection sending-out system can be realized, and the reasonable distribution of the active power between the DR and the MMC is ensured. A proportional droop link is added to the given reference voltage on the alternating current side, so that the reasonable distribution of the active power when the transmission power of the wind power plant changes is realized, and the control strategy is shown in fig. 3.
Compared with the original passive V/F control, the improved control strategy is mainly characterized in that the voltage reference given value of the outer ring of the d-axis control quantity comprises a power droop link, so that the effective adjustment of the AC side voltage is realized when the transmission power of the wind power plant changes, and the effective value U of the AC side bus voltage1The control rate of (c) satisfies:
in the formula: u shaped *Is an AC voltage reference value; pMMCOutputting power for MMC; kvacIs a sag factor, Ud *Satisfies the following conditions:
the condition indicates that DR does not output active power when the active output of the wind power plant is 0. The conventional V/F control structure can be regarded as the droop coefficient KvacIs 0, a reference value U of alternating voltaged *The control strategy of the embodiment is under the special working condition of the constant condition.
KvacSelection of values ofRelated to the distribution of active power between MMC and DR. When K isvacWhen the numerical value is larger, when the transmission power of the wind power plant is increased, the DR output power is increased greatly, the MMC reactive output increment is larger, and the active output increment is smaller; otherwise when KvacWhen the voltage of the alternating-current bus is small, the variation of the wind field output active power is mainly borne by the MMC, and the variation of the alternating-current bus voltage is small. In the actual operation of the parallel sending-out system, the reasonable K is selected by considering the capacity ratio of DR and MMC converters and the limitation of the operation intervalvacAnd reasonable distribution of active power is realized.
At the same time, Ud *And KvacSelection of (2) and MMC power delivery P at DR startupMMC0The method comprises the following steps:
shows that when the wind power plant delivers less than PMMC0All power is sent by the MMC; when the transmission power is larger than the value, the DR is started and coordinates with the MMC to send out the power of the wind power plant.
The offshore wind power is sent out the power control strategy of the system through DR-MMC parallel hybrid direct current, and on the basis of analyzing the active power back-off phenomenon of the parallel sending-out system existing in the system operation, a passive control strategy based on active voltage sag is provided, so that the reasonable distribution of the active power between the DR and the MMC of the sending end is realized, the power back-off condition caused by wind speed dip is avoided, and the economical efficiency of the system operation is improved.
Example 2:
an embodiment 2 of the present invention provides a power control system for an offshore wind power DR-MMC hybrid dc delivery system, including:
a data acquisition module configured to: acquiring parameter data of an offshore wind power DR-MMC mixed direct current sending system;
a power distribution module configured to: obtaining an active power distribution result of the MMC and the DR according to the obtained parameter data and a preset control model;
in the preset control model, the effective value of the alternating-current side bus voltage is the sum of the product of the droop coefficient and the MMC output power and the d-axis alternating-current voltage reference value.
The working method of the system is the same as the steps in the power control method of the offshore wind power DR-MMC hybrid direct current sending-out system provided in embodiment 1, and details are not repeated here.
Example 3:
embodiment 3 of the present invention provides a computer-readable storage medium, on which a program is stored, which, when executed by a processor, implements the steps in the method for controlling power of an offshore wind power DR-MMC hybrid dc-dc transmission system according to embodiment 1 of the present invention.
Example 4:
embodiment 4 of the present invention provides an electronic device, which includes a memory, a processor, and a program stored in the memory and executable on the processor, where the processor executes the program to implement the steps in the method for controlling the power of the offshore wind power DR-MMC hybrid dc transmission system according to embodiment 1 of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A power control method for an offshore wind power DR-MMC mixed direct current sending system is characterized by comprising the following steps: the method comprises the following steps:
acquiring parameter data of an offshore wind power DR-MMC mixed direct current sending system;
obtaining an active power distribution result of the MMC and the DR according to the obtained parameter data and a preset control model;
in the preset control model, the effective value of the alternating-current side bus voltage is the sum of the product of the droop coefficient and the MMC output power and the d-axis alternating-current voltage reference value.
2. The offshore wind power DR-MMC hybrid direct current send-out system power control method of claim 1, characterized by:
the product of the DR unit number of 1.35 times and the transformation ratio of the DR transformer is a first variable, the ratio of the shore equivalent direct current voltage to the first variable is a first voltage, and the d-axis alternating current voltage reference value is smaller than or equal to the first voltage.
3. The offshore wind power DR-MMC hybrid direct current send-out system power control method of claim 2, characterized by:
the output power of the MMC is as follows: the difference value of the first voltage and the d-axis alternating voltage reference value is then compared with the droop coefficient.
4. The offshore wind power DR-MMC hybrid direct current send-out system power control method of claim 1, characterized by:
the output current of the offshore wind power DR-MMC mixed direct current sending system is the sum of the output current of the MMC direct current side and the output current of the DR direct current side;
the output power of the offshore wind power DR-MMC mixed direct current sending system is the sum of the output power of the MMC direct current side and the output power of the DR direct current side.
5. The offshore wind power DR-MMC hybrid direct current send-out system power control method of claim 1, characterized by:
the difference value of the voltage on the DR direct current side and the voltage on the MMC direct current side is the product of the output current on the DR direct current side and the resistance values of the connecting cable and the smoothing reactor.
6. The offshore wind power DR-MMC hybrid direct current send-out system power control method of claim 1, characterized by:
if the output current of the MMC direct current side and the output current of the DR direct current side both use the sending direction as positive, the differential mode component of the direct current is as follows: the difference value of the DR direct current side output current and the MMC direct current side output current is 0.5 times.
7. The offshore wind power DR-MMC hybrid direct current send-out system power control method of claim 1, characterized by:
if the output current of the MMC direct current side and the output current of the DR direct current side both use the sending direction as positive, the common mode component of the direct current is as follows: and the sum of the DR direct-current side output current and the MMC direct-current side output current is 0.5 times.
8. The utility model provides a mixed direct current of offshore wind power DR-MMC sends out system power control system which characterized in that: the method comprises the following steps:
a data acquisition module configured to: acquiring parameter data of an offshore wind power DR-MMC mixed direct current sending system;
a power distribution module configured to: obtaining an active power distribution result of the MMC and the DR according to the obtained parameter data and a preset control model;
in the preset control model, the effective value of the alternating-current side bus voltage is the sum of the product of the droop coefficient and the MMC output power and the d-axis alternating-current voltage reference value.
9. A computer readable storage medium having a program stored thereon, wherein the program when executed by a processor implements the steps in the offshore wind DR-MMC hybrid dc-delivery system power control method of any of claims 1-7.
10. An electronic device comprising a memory, a processor and a program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps in the offshore wind DR-MMC hybrid dc-dc delivery system power control method of any of claims 1-7.
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| CN118157212A (en) * | 2024-05-13 | 2024-06-07 | 国网浙江省电力有限公司电力科学研究院 | Alternating current networking method, device and medium of DRU-MMC hybrid converter |
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