CN110797897A - Method and system for determining maximum ratio of new energy at extra-high voltage direct current sending end - Google Patents

Method and system for determining maximum ratio of new energy at extra-high voltage direct current sending end Download PDF

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CN110797897A
CN110797897A CN201910973692.0A CN201910973692A CN110797897A CN 110797897 A CN110797897 A CN 110797897A CN 201910973692 A CN201910973692 A CN 201910973692A CN 110797897 A CN110797897 A CN 110797897A
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extra
high voltage
direct current
new energy
sending end
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CN110797897B (en
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王铁柱
汪梦军
马士聪
张曦
曾思成
郭剑波
赵兵
王姗姗
王天昊
于光耀
马世乾
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Tianjin Electric Power Co Ltd
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Tianjin Electric Power Co Ltd
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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Abstract

The invention discloses a method and a system for determining the maximum ratio of new energy at an extra-high voltage direct current sending end, and belongs to the technical field of operation control of power systems. The method comprises the following steps: the method comprises the steps that an alternating-current main network of an extra-high voltage direct-current sending end alternating-current system is equivalent to an equivalent alternating-current system, a new energy unit equivalent matched with the extra-high voltage direct-current sending end alternating-current system in a near area is equivalent to a new energy system in the near area, and equivalent parameters are obtained; determining the new energy ratio of the near area of the extra-high voltage direct current sending end alternating current system; determining the transient voltage rise of an extra-high voltage direct current sending end alternating current system according to the new energy ratio; and acquiring the maximum ratio of new energy of the extra-high voltage direct current sending end alternating current system. The method can be used for analyzing and operating the actual power grid, can simplify the analysis and calculation difficulty while ensuring the accuracy of the calculation result, has higher engineering applicability, and can effectively ensure the safe and stable operation of the power grid.

Description

Method and system for determining maximum ratio of new energy at extra-high voltage direct current sending end
Technical Field
The invention relates to the technical field of power system operation control, in particular to a method and a system for determining the maximum ratio of new energy at an extra-high voltage direct current transmission end.
Background
Wind and light resources in China are mainly concentrated in the three north area, load centers are concentrated in east China and China, and the distance between a wind and light energy source base and the load centers is 800-3000 kilometers. The extra-high voltage direct current transmission has point-to-point, ultra-long distance and high-capacity transmission capacity, and is a core technology for solving the problem of reverse distribution of energy and power load in China and implementing the national 'West-east electricity transmission' strategy. When wind power is independently transmitted, the uncertainty brings risks to the safe and stable operation of a power grid, a power transmission channel cannot be fully utilized, and the economy is poor; the mode of 'bundling' wind power and near-region thermal power is adopted for mixed delivery, and the method is an ideal power transmission mode.
In the actual operation process, when the phase commutation failure or the blocking failure occurs to the extra-high voltage direct current, large power disturbance is brought to a power grid at a sending end, and transient overvoltage is generated along with the phase commutation failure or the blocking failure, so that the new energy source unit in the near area is possibly disconnected due to insufficient high-voltage resistance. The problem of transient overvoltage at the sending end caused by the failure of the phase conversion of the extra-high voltage direct current becomes a main factor for restricting the direct current sending capability and the new energy access capability of wind fire bundling.
The problem of sending end transient overvoltage caused by high-capacity extra-high voltage direct current commutation failure is solved, the new energy occupation ratio of a direct current sending end cannot be infinitely increased, and the new energy occupation ratio has the maximum occupation ratio which can be accepted by a system; currently, there is no practical determination method for the maximum ratio of new energy at the dc transmission end considering the transient overvoltage.
Disclosure of Invention
Aiming at the problems, the invention provides a method for determining the maximum ratio of new energy at an extra-high voltage direct current sending end, which comprises the following steps:
the method comprises the steps that an alternating-current main network of an extra-high voltage direct-current sending end alternating-current system is equivalent to an equivalent alternating-current system, the equivalent of a near-region matched new energy unit of the extra-high voltage direct-current sending end alternating-current system is equivalent to a near-region equivalent new energy system, and equivalent parameters are obtained;
obtaining installed capacity S of near-region new energy systemwindActive power P transmitted in normal operation before commutation failure of direct current systemdcAccording to SwindAnd PdcDetermining new energy ratio k of near-region of extra-high voltage direct current sending end alternating current systemwind；
Obtaining the reactive power Q consumed by the normal operation before the commutation failure of the DC systemdcReactive power Q emitted when new energy system enters low penetration zonewindAccording to the equivalent parameter, Qdc、QwindAnd new energy ratio kwindDetermining transient voltage rise delta U of extra-high voltage direct current sending end alternating current system2；
Increasing the transient state voltage of an extra-high voltage direct current sending end alternating current system by delta U2As the maximum transient voltage rise delta U allowed by the operation of an extra-high voltage direct current sending end alternating current system2MAXAccording to Δ U2MAXObtaining maximum ratio k of new energy of extra-high voltage direct current sending end alternating current systemwind_max。
Optionally, the equivalent parameters include:
internal potential U of AC system1Active power P sent by AC system1Reactive power Q sent by AC system1Equivalent impedance Z of AC systemeqActive power P injected into extra-high voltage direct current sending end of alternating current system2Reactive power Q injected into extra-high voltage direct current transmission end of alternating current system2Active power P injected into extra-high voltage direct current sending end by near-region new energy system3Reactive power Q injected into extra-high voltage direct current transmission end by near-region new energy system3。
Optionally, determining the new energy ratio k of the near-zone of the extra-high voltage direct current sending end alternating current systemwindThe formula is determined as follows:
optionally, determining transient overvoltage delta U of alternating-current system at extra-high voltage direct-current transmission end2The method specifically comprises the following steps:
when extra-high voltage direct current commutation fails, transient voltage rise delta U of a direct current sending end converter is obtained2The formula is as follows:
Figure BDA0002232938030000031
wherein, XeqEquivalent impedance Z for AC systemseqImaginary part of, U1Is the internal potential of an alternating current system; determining the reactive power Q consumed by the normal operation before commutation failure of the DC systemdcActive power P transmitted in normal operation before commutation failure of direct current systemdcRatio k of1；
Determining reactive power Q emitted when a near-area new energy system enters low penetrationwindInstalled capacity S of new energy system in near regionwindRatio k of2The formula is as follows:
Figure BDA0002232938030000032
according to the equivalent parameter, kwind、k1And k2Transient voltage rise delta U of direct current sending end after determination of new energy ratio2The formula is as follows:
Figure BDA0002232938030000033
optionally, obtaining the maximum ratio k of new energy of the extra-high voltage direct current sending end alternating current systemwind_maxObtaining a formula as follows;
Figure BDA0002232938030000034
the invention also provides a system for determining the maximum ratio of new energy at the extra-high voltage direct current sending end, which comprises:
the equivalence module is used for equating an alternating current main network of the extra-high voltage direct current sending end alternating current system to be an equivalent alternating current system, equating a new energy unit matched with the extra-high voltage direct current sending end alternating current system in a near area to be a near area equivalent new energy system, and obtaining an equivalent equivalence parameter;
a first calculation module for acquiring the installed capacity S of the near-region new energy systemwindActive power P transmitted in normal operation before commutation failure of direct current systemdcAccording to SwindAnd PdcDetermining new energy ratio k of near-region of extra-high voltage direct current sending end alternating current systemwind；
A second calculation module for obtaining the reactive power Q consumed by the DC system in normal operation before commutation failuredcReactive power Q emitted when new energy system enters low penetration zonewindAccording to the equivalent parameter, Qdc、QwindAnd new energy ratio kwindDetermining transient voltage rise delta U of extra-high voltage direct current sending end alternating current system2；
A third calculation module for increasing the transient voltage of the ultra-high voltage DC transmitting end AC system by delta U2As the maximum allowable operation of an extra-high voltage direct current sending end alternating current systemLarge transient pressure rise delta U2MAXAccording to Δ U2MAXObtaining maximum ratio k of new energy of extra-high voltage direct current sending end alternating current systemwind_max。
Optionally, the equivalent parameters include:
internal potential U of AC system1Active power P sent by AC system1Reactive power Q sent by AC system1Equivalent impedance Z of AC systemeqActive power P injected into extra-high voltage direct current sending end of alternating current system2Reactive power Q injected into extra-high voltage direct current transmission end of alternating current system2Active power P injected into extra-high voltage direct current sending end by near-region new energy system3Reactive power Q injected into extra-high voltage direct current transmission end by near-region new energy system3。
Optionally, determining the new energy ratio k of the near-zone of the extra-high voltage direct current sending end alternating current systemwindThe formula is determined as follows:
Figure BDA0002232938030000041
optionally, determining transient overvoltage delta U of alternating-current system at extra-high voltage direct-current transmission end2The method specifically comprises the following steps:
when extra-high voltage direct current commutation fails, transient voltage rise delta U of a direct current sending end converter is obtained2The formula is as follows:
Figure BDA0002232938030000042
wherein, XeqEquivalent impedance Z for AC systemseqImaginary part of, U1Is the internal potential of an alternating current system; determining the reactive power Q consumed by the normal operation before commutation failure of the DC systemdcActive power P transmitted in normal operation before commutation failure of direct current systemdcRatio k of1；
Determining reactive power Q emitted when a near-area new energy system enters low penetrationwindInstalled capacity S of new energy system in near regionwindRatio k of2The formula is as follows:
Figure BDA0002232938030000043
according to the equivalent parameter, kwind、k1And k2Transient voltage rise delta U of direct current sending end after determination of new energy ratio2The formula is as follows:
Figure BDA0002232938030000044
optionally, obtaining the maximum ratio k of new energy of the extra-high voltage direct current sending end alternating current systemwind_maxObtaining a formula as follows;
Figure BDA0002232938030000045
the method can be used for analyzing and operating the actual power grid, can simplify the analysis and calculation difficulty while ensuring the accuracy of the calculation result, has higher engineering applicability, and can effectively ensure the safe and stable operation of the power grid.
Drawings
FIG. 1 is a topological structure diagram of an extra-high voltage DC transmitting end AC system according to a method for determining the maximum ratio of new energy at the extra-high voltage DC transmitting end;
FIG. 2 is a topological structure diagram of an equivalent alternating current system and a near-area new energy system according to the method for determining the maximum ratio of new energy at an extra-high voltage direct current sending end;
FIG. 3 is a flowchart of a method for determining a maximum ratio of new energy at an extra-high voltage DC transmitting end according to the present invention;
fig. 4 is a system structure diagram for determining the maximum ratio of new energy at the extra-high voltage direct current transmission end according to the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including 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. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a method for determining the maximum ratio of new energy at an extra-high voltage direct current sending end, which comprises the following steps of:
the method comprises the steps that an alternating main network of an extra-high voltage direct current sending end alternating current system is equivalent to an equivalent alternating current system, a near-region matching new energy unit of the extra-high voltage direct current sending end alternating current system is equivalent to a near-region equivalent new energy system, and equivalent parameters are obtained;
the topological structure of an extra-high voltage direct current sending end alternating current system is shown in figure 1, wherein Wind _ 1-Wind _ M are M Wind turbine sets matched with a near area, and EW1～EWMRepresenting wind turbine equivalent terminal voltage, ZTW1～ZTWNZ is the equivalent impedance of the boosting transformer corresponding to each wind turbineL_WindRepresenting the equivalent impedance of a power transmission line from a near-region matched wind turbine generator to an extra-high voltage direct current transmission end; gen _ 1-Gen _ N are N thermal power generating units matched in near region, EG1～EGNRepresenting the generator equivalent internal potential, ZG1～ZGNRepresenting equivalent impedance, Z, of the respective unitTG1～ZTGNRepresenting the equivalent impedance, Z, of the step-up transformer corresponding to each unitL_GenRepresenting the equivalent impedance of a power transmission line from a near-region matched thermal power generating unit to an extra-high voltage direct current transmission end; u shapeSRepresenting the equivalent internal potential, Z, of the AC mains networkSRepresenting the equivalent impedance, U, of the AC mains network2And the voltage represents the alternating voltage of the extra-high voltage direct current transmission end.
The equivalent alternating current system and the near-zone new energy system are shown in fig. 2 and comprise:
internal potential U of AC system1Active power P sent by AC system1Reactive power Q sent by AC system1Equivalent impedance Z of AC systemeqActive power P injected into extra-high voltage direct current sending end of alternating current system2Reactive power Q injected into extra-high voltage direct current transmission end of alternating current system2Active power P injected into extra-high voltage direct current sending end by near-region new energy system3Reactive power Q injected into extra-high voltage direct current transmission end by near-region new energy system3。
In equivalent AC system and near-field new energy system, U1、P1、Q1、ZeqThe values of Z are as follows:
wherein R iseqIs ZeqReal part of, XeqIs ZeqThe imaginary part of (c).
Obtaining installed capacity S of near-region new energy systemwindActive power P transmitted in normal operation before commutation failure of direct current systemdcAccording to SwindAnd PdcDetermining new energy ratio k of near-region of extra-high voltage direct current sending end alternating current systemwind；
The determination formula is as follows:
Figure BDA0002232938030000071
obtaining the reactive power Q consumed by the normal operation before the commutation failure of the DC systemdcReactive power Q emitted when new energy system enters low penetration zonewindAccording to the equivalent parameter, Qdc、QwindAnd new energy ratio kwindDetermining transient voltage rise delta U of extra-high voltage direct current sending end alternating current system2The method specifically comprises the following steps:
when extra-high voltage direct current commutation fails, transient voltage rise delta U of a direct current sending end converter is obtained2The formula is as follows:
wherein, XeqEquivalent impedance Z for AC systemseqImaginary part of, U1Is the internal potential of an alternating current system; determining the reactive power Q consumed by the normal operation before commutation failure of the DC systemdcActive power P transmitted in normal operation before commutation failure of direct current systemdcRatio k of1；
Determining reactive power Q emitted when a near-area new energy system enters low penetrationwindInstalled capacity S of new energy system in near regionwindRatio k of2The formula is as follows:
Figure BDA0002232938030000073
according to the equivalent parameter, kwind、k1And k2Transient voltage rise delta U of direct current sending end after determination of new energy ratio2The formula is as follows:
Figure BDA0002232938030000074
increasing the transient state voltage of an extra-high voltage direct current sending end alternating current system by delta U2As the maximum transient voltage rise delta U allowed by the operation of an extra-high voltage direct current sending end alternating current system2MAXAccording to Δ U2MAXObtaining maximum ratio k of new energy of extra-high voltage direct current sending end alternating current systemwind_maxObtaining a formula as follows;
the invention also provides a system 200 for determining the maximum ratio of new energy at an extra-high voltage direct current sending end, as shown in fig. 4, comprising:
the equivalent module 201 is used for obtaining equivalent parameters by taking the equivalent of an alternating current main network of the extra-high voltage direct current sending end alternating current system as an equivalent alternating current system and taking the equivalent of a near-region matched new energy unit of the extra-high voltage direct current sending end alternating current system as a near-region equivalent new energy system;
equivalent parameters, including:
internal potential U of AC system1Active power P sent by AC system1Reactive power Q sent by AC system1Equivalent impedance Z of AC systemeqActive power P injected into extra-high voltage direct current sending end of alternating current system2Reactive power Q injected into extra-high voltage direct current transmission end of alternating current system2Active power P injected into extra-high voltage direct current sending end by near-region new energy system3Reactive power Q injected into extra-high voltage direct current transmission end by near-region new energy system3。
The first calculation module 202 obtains installed capacity S of the near-zone new energy systemwindActive power P transmitted in normal operation before commutation failure of direct current systemdcAccording to SwindAnd PdcDetermining new energy ratio k of near-region of extra-high voltage direct current sending end alternating current systemwindThe formula is as follows:
the second calculation module 203 obtains the reactive power Q consumed by the normal operation before the commutation failure of the DC systemdcReactive power Q emitted when new energy system enters low penetration zonewindAccording to the equivalent parameter, Qdc、QwindAnd new energy ratio kwindDetermining transient voltage rise delta U of extra-high voltage direct current sending end alternating current system2The method specifically comprises the following steps:
the method specifically comprises the following steps:
when extra-high voltage direct current commutation fails, transient voltage rise delta U of a direct current sending end converter is obtained2The formula is as follows:
Figure BDA0002232938030000082
wherein, XeqEquivalent impedance Z for AC systemseqImaginary part of, U1Is the internal potential of an alternating current system; determining a direct current systemReactive power Q consumed in normal operation before commutation failuredcActive power P transmitted in normal operation before commutation failure of direct current systemdcRatio k of1；
Determining reactive power Q emitted when a near-area new energy system enters low penetrationwindInstalled capacity S of new energy system in near regionwindRatio k of2The formula is as follows:
Figure BDA0002232938030000083
according to the equivalent parameter, kwind、k1And k2Transient voltage rise delta U of direct current sending end after determination of new energy ratio2The formula is as follows:
Figure BDA0002232938030000091
a third calculating module 204 for increasing the transient voltage of the ultra-high voltage DC transmitting end AC system by delta U2As the maximum transient voltage rise delta U allowed by the operation of an extra-high voltage direct current sending end alternating current system2MAXAccording to Δ U2MAXObtaining maximum ratio k of new energy of extra-high voltage direct current sending end alternating current systemwind_maxThe formula is as follows.
Figure BDA0002232938030000092
The method can be used for analyzing and operating the actual power grid, can simplify the analysis and calculation difficulty while ensuring the accuracy of the calculation result, has higher engineering applicability, and can effectively ensure the safe and stable operation of the power grid.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. 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.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (10)

1. A method for determining the maximum ratio of new energy at an extra-high voltage direct current sending end comprises the following steps:
the method comprises the steps that an alternating-current main network of an extra-high voltage direct-current sending end alternating-current system is equivalent to an equivalent alternating-current system, the equivalent of a near-region matched new energy unit of the extra-high voltage direct-current sending end alternating-current system is equivalent to a near-region equivalent new energy system, and equivalent parameters are obtained;
obtaining installed capacity S of near-region new energy systemwindActive power P transmitted in normal operation before commutation failure of direct current systemdcAccording to SwindAnd PdcDetermining new energy ratio k of near-region of extra-high voltage direct current sending end alternating current systemwind；
Obtaining the reactive power Q consumed by the normal operation before the commutation failure of the DC systemdcReactive power Q emitted when new energy system enters low penetration zonewindAccording to the equivalent parameter, Qdc、QwindAnd new energy ratio kwindDetermining transient voltage rise delta U of extra-high voltage direct current sending end alternating current system2；
Increasing the transient state voltage of an extra-high voltage direct current sending end alternating current system by delta U2As the maximum transient voltage rise delta U allowed by the operation of an extra-high voltage direct current sending end alternating current system2MAXAccording to Δ U2MAXObtaining maximum ratio k of new energy of extra-high voltage direct current sending end alternating current systemwind_max。
2. The method of claim 1, wherein the equivalent parameters comprise:
internal potential U of AC system1Active power P sent by AC system1Reactive power Q sent by AC system1Equivalent impedance Z of AC systemeqActive power P injected into extra-high voltage direct current sending end of alternating current system2Reactive power Q injected into extra-high voltage direct current transmission end of alternating current system2Active power P injected into extra-high voltage direct current sending end by near-region new energy system3Injecting extra-high voltage direct current into near-region new energy systemReactive power Q of the transmitting end3。
3. The method according to claim 1, wherein the new energy ratio k of the near-zone of the extra-high voltage direct current sending end alternating current system is determinedwindThe formula is determined as follows:
Figure FDA0002232938020000011
4. the method as claimed in claim 1, wherein determining the transient overvoltage au of the uhv-dc transmitting ac system2The method specifically comprises the following steps:
when extra-high voltage direct current commutation fails, transient voltage rise delta U of a direct current sending end converter is obtained2The formula is as follows:
wherein, XeqEquivalent impedance Z for AC systemseqImaginary part of, U1Is the internal potential of an alternating current system; determining the reactive power Q consumed by the normal operation before commutation failure of the DC systemdcActive power P transmitted in normal operation before commutation failure of direct current systemdcRatio k of1；
Determining reactive power Q emitted when a near-area new energy system enters low penetrationwindInstalled capacity S of new energy system in near regionwindRatio k of2The formula is as follows:
Figure FDA0002232938020000022
according to the equivalent parameter, kwind、k1And k2Transient voltage rise delta U of direct current sending end after determination of new energy ratio2The formula is as follows:
Figure FDA0002232938020000023
5. the method according to claim 1, wherein the maximum ratio k of new energy resources of the extra-high voltage direct current sending end alternating current system is obtainedwind_maxObtaining a formula as follows;
Figure FDA0002232938020000024
6. a system for determining the maximum ratio of new energy at an extra-high voltage direct current sending end comprises:
the equivalence module is used for equating an alternating current main network of the extra-high voltage direct current sending end alternating current system to be an equivalent alternating current system, equating a new energy unit matched with the extra-high voltage direct current sending end alternating current system in a near area to be a near area equivalent new energy system, and obtaining an equivalent equivalence parameter;
a first calculation module for acquiring the installed capacity S of the near-region new energy systemwindActive power P transmitted in normal operation before commutation failure of direct current systemdcAccording to SwindAnd PdcDetermining new energy ratio k of near-region of extra-high voltage direct current sending end alternating current systemwind；
A second calculation module for obtaining the reactive power Q consumed by the DC system in normal operation before commutation failuredcReactive power Q emitted when new energy system enters low penetration zonewindAccording to the equivalent parameter, Qdc、QwindAnd new energy ratio kwindDetermining transient voltage rise delta U of extra-high voltage direct current sending end alternating current system2；
A third calculation module for increasing the transient voltage of the ultra-high voltage DC transmitting end AC system by delta U2As the maximum transient voltage rise delta U allowed by the operation of an extra-high voltage direct current sending end alternating current system2MAXAccording to Δ U2MAXObtaining maximum ratio k of new energy of extra-high voltage direct current sending end alternating current systemwind_max。
7. The system of claim 6, wherein the equivalent parameters comprise:
internal potential U of AC system1Active power P sent by AC system1Reactive power Q sent by AC system1Equivalent impedance Z of AC systemeqActive power P injected into extra-high voltage direct current sending end of alternating current system2Reactive power Q injected into extra-high voltage direct current transmission end of alternating current system2Active power P injected into extra-high voltage direct current sending end by near-region new energy system3Reactive power Q injected into extra-high voltage direct current transmission end by near-region new energy system3。
8. The system of claim 6, wherein the determined new energy ratio k of the near-zone of the extra-high voltage direct current sending end alternating current systemwindThe formula is determined as follows:
Figure FDA0002232938020000031
9. the system of claim 6, wherein the determining the transient overvoltage AU of the UHVDC sending-end AC system2The method specifically comprises the following steps:
when extra-high voltage direct current commutation fails, transient voltage rise delta U of a direct current sending end converter is obtained2The formula is as follows:
Figure FDA0002232938020000032
wherein, XeqEquivalent impedance Z for AC systemseqImaginary part of, U1Is the internal potential of an alternating current system; determining the reactive power Q consumed by the normal operation before commutation failure of the DC systemdcActive power P transmitted in normal operation before commutation failure of direct current systemdcRatio k of1；
Determining reactive power Q emitted when a near-area new energy system enters low penetrationwindInstalled capacity S of new energy system in near regionwindRatio k of2The formula is as follows:
Figure FDA0002232938020000033
according to the equivalent parameter, kwind、k1And k2Transient voltage rise delta U of direct current sending end after determination of new energy ratio2The formula is as follows:
Figure FDA0002232938020000034
10. the system of claim 6, wherein the maximum ratio k for obtaining new energy of the extra-high voltage direct current sending end alternating current systemwind_maxObtaining a formula as follows;
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