CN110048446A - A kind of method and system of the determining layering best drop point of direct current access system receiving end - Google Patents

A kind of method and system of the determining layering best drop point of direct current access system receiving end Download PDF

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CN110048446A
CN110048446A CN201910218156.XA CN201910218156A CN110048446A CN 110048446 A CN110048446 A CN 110048446A CN 201910218156 A CN201910218156 A CN 201910218156A CN 110048446 A CN110048446 A CN 110048446A
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direct current
layered
short
current
determining
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林伟芳
汤涌
易俊
郭强
余芳芳
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China Electric Power Research Institute Co Ltd CEPRI
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China Electric Power Research Institute Co Ltd CEPRI
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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
    • 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]
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The invention discloses a kind of method and system of determining layering best drop point of direct current access system receiving end, belong to technical field of power systems.The method of the present invention comprises determining that n drop point of the receiving-end system of layering direct current access, establishes AC system equivalence nodal impedance matrix when layering direct current drop point is i and s；The capacity of short circuit of change of current bus is determined according to the equivalent node impedance；The layering direct-current short circuit ratio of ac and dc systems is determined according to the equivalent node impedance of AC system and DC converter busbar short-circuit capacity；The best drop point of layering direct current access is determined according to the index of characterization ac and dc systems power.This invention ensures that the safe and stable operation of the ac and dc systems of extra-high voltage layering direct current access, the best drop point according to direct-current short circuit than selection layering direct current access, provide the judgment basis of planning and operation for work about electric power personnel.

Description

Method and system for determining optimal receiving end drop point of layered direct current access system
Technical Field
The present invention relates to the field of power system technologies, and in particular, to a method and a system for determining an optimal drop point of a receiving end of a hierarchical dc access system.
Background
Because resources and productivity in China are unevenly distributed, more than 80% of energy resources are distributed in the west and north, more than 70% of power consumption is concentrated in the east and south, the supply and demand distances are 800-3000 kilometers, and long-distance and large-capacity energy power transmission is needed, so that multiple direct current drop points cannot be avoided in the same receiving end alternating current system (load center). At present, 21 direct currents are put into operation in the area governed by the national grid company, and 9 extra-high voltage direct currents are available. In China, an alternating current-direct current power grid with the highest direct current voltage level, the largest single-loop direct current transmission capacity and the largest direct current transmission scale in the world is formed, and an alternating current-direct current system fed in by two major factors, namely east China and Guangdong, is formed. With the improvement of the direct-current voltage grade and the transmission capacity, a severe test is brought to the voltage reactive power supporting capability and the tidal current evacuation of the receiving-end power grid. The extra-high voltage direct current is connected to an alternating current power grid with a non-stop voltage level in a layered mode, so that the accepting capacity and the voltage supporting capacity of a receiving end alternating current system are obviously improved, and the method has an important effect on improving the power transmission efficiency, saving valuable land and corridor resources and obviously improving economic and social benefits. For a receiving end system accessed by a direct current layer, the problem of voltage stability is more complicated, and on one hand, the voltage problem may be caused by the interaction between the direct current system and a nearby alternating current system; on the other hand, if the direct current is concentrated at the point of the receiving end system, the interaction between different direct current systems will also occur, further expanding the voltage problem, and then causing the failure of successive phase change of the direct current, finally causing large-scale power failure. According to the planning, the extra-high voltage large-capacity direct-current transmission project newly built in China is increasingly accessed to a receiving-end alternating-current power grid in a layered mode. The short circuit ratio is usually used in the early stage of planning, the strength of an alternating current system in an alternating current and direct current system is measured, and the strength of the alternating current system determines the interaction property and related problems between the alternating current system and the direct current system to a great extent.
Disclosure of Invention
In view of the above problems, the present invention provides a method for determining an optimal drop point of a receiving end of a hierarchical dc access system, including:
determining n drop points of a layered direct current access receiving end system, establishing an equivalent node impedance matrix of the alternating current system when the layered direct current drop points are i and s, and determining equivalent node impedance;
the i and the s are any layered direct current drop points;
determining the short-circuit capacity of the current conversion bus according to the equivalent node impedance;
determining the layered direct-current short-circuit ratio of the alternating-current and direct-current systems according to the equivalent node impedance of the alternating-current system and the short-circuit capacity of the direct-current conversion bus;
and determining the optimal drop point of the layered direct current access according to the index representing the strength of the alternating current and direct current system.
Optionally, the impedance matrix is as follows:
wherein Z iseqExpressing an equivalent node impedance matrix of an alternating current system, T expressing transposition, n expressing the total number of current conversion buses in an alternating current-direct current system, MnRepresenting the correlation vector of the converter busbar n, Z representing the nodal impedance matrix of the AC system, ZeqnnRepresents ZeqThe nth row and the nth column of elements; m1，M2，…MnAre respectively provided withExpressed as:
……
where k represents the total number of nodes in the ac system.
Optionally, the short-circuit capacity of the dc converter bus is calculated according to the equivalent node impedance of the ac system, and the capacity formula is as follows:
wherein S isaciIndicating the short-circuit capacity, U, of the converter bus i in a multi-feed DC systemiRepresenting the voltage amplitude, Z, of the converter bus i in a multi-feed DC systemeqiiRepresents ZeqRow i and column i.
Optionally, the layered dc short-circuit ratio of the ac/dc system is determined according to the equivalent node impedance of the ac system and the short-circuit capacity of the dc converter bus, and the short-circuit ratio formula is as follows:
wherein, SSCRiRepresenting the DC short-circuit ratio, P, of the converter bus i in a hierarchical DC systemdiRepresenting the DC power, P, of a converter bus i in a layered DC systemdsAs another in a layered DC systemDC power, P, of end-conversion bus sdjIs the direct current power, Z, of other commutation buses in the AC-DC system except the commutation bus ieqijRepresents ZeqRow i, column j element of (2), ZeqsiRepresents ZeqS-th row, i-th column element, Zeqss represents ZeqRow s and column s.
Optionally, determining the best drop point of the layered dc access according to the index representing the strength of the ac/dc system specifically includes:
and judging the short circuit ratio of the layered direct current access system in a receiving end access mode according to the strength index of the alternating current-direct current system, and determining the optimal drop point of the layered direct current access.
The invention also provides a system for determining the best drop point of the receiving end of the layered direct current access system, which comprises the following steps:
the first calculation module is used for determining n drop points of a layered direct current access receiving end system, establishing an equivalent node impedance matrix of the alternating current system when the layered direct current drop points are i and s, and determining equivalent node impedance;
the i and the s are any layered direct current drop points;
the second calculation module is used for determining the short-circuit capacity of the commutation bus according to the equivalent node impedance;
the third calculation module is used for determining the layered direct-current short-circuit ratio of the alternating-current and direct-current system according to the equivalent node impedance of the alternating-current system and the short-circuit capacity of the direct-current conversion bus;
and the drop point determining module is used for determining the optimal drop point of the layered direct current access according to the index representing the strength of the alternating current-direct current system.
Optionally, the impedance matrix is as follows:
wherein Z iseqExpressing an equivalent node impedance matrix of an alternating current system, T expressing transposition, n expressing the total number of current conversion buses in an alternating current-direct current system, MnRepresenting the correlation vector of the converter busbar n, Z representing the nodal impedance matrix of the AC system, ZeqnnRepresents ZeqThe nth row and the nth column of elements; m1，M2，…MnRespectively expressed as:
……
where k represents the total number of nodes in the ac system.
Optionally, the short-circuit capacity of the dc converter bus is calculated according to the equivalent node impedance of the ac system, and the capacity formula is as follows:
wherein S isaciIndicating the short-circuit capacity, U, of the converter bus i in a multi-feed DC systemiRepresenting the voltage amplitude, Z, of the converter bus i in a multi-feed DC systemeqiiRepresents ZeqRow i and column i.
Optionally, the layered dc short-circuit ratio of the ac/dc system is determined according to the equivalent node impedance of the ac system and the short-circuit capacity of the dc converter bus, and the short-circuit ratio formula is as follows:
wherein, SSCRiRepresenting the DC short-circuit ratio, P, of the converter bus i in a hierarchical DC systemdiRepresenting the DC power, P, of a converter bus i in a layered DC systemdsFor the direct current power, P, of another end of the converter bus s in a layered direct current systemdjIs the direct current power, Z, of other commutation buses in the AC-DC system except the commutation bus ieqijRepresents ZeqRow i, column j element of (2), ZeqsiRepresents ZeqS-th row, i-th column element, Zeqss represents ZeqRow s and column s.
Optionally, determining the best drop point of the layered dc access according to the index representing the strength of the ac/dc system specifically includes:
and judging the short circuit ratio of the layered direct current access system in a receiving end access mode according to the strength index of the alternating current-direct current system, and further determining the optimal drop point of the layered direct current access.
The invention ensures the safe and stable operation of the alternating current and direct current system of the extra-high voltage layered direct current access, selects the optimal drop point of the layered direct current access according to the direct current short circuit ratio, and provides a judgment basis for planning and operation for power workers.
Drawings
Fig. 1 is a flowchart of a method for determining an optimal drop point of a receiving end of a hierarchical dc access system according to the present invention;
fig. 2 is a system structure diagram for determining the best landing point of the receiving end of the hierarchical dc access system 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 best landing point of a receiving end of a layered direct current access system, as shown in figure 1, comprising the following steps:
determining n drop points of a layered direct current access receiving end system, establishing an equivalent node impedance matrix of the alternating current system when the layered direct current drop points are i and s, and determining equivalent node impedance;
the i and the s are any layered direct current drop points;
the impedance matrix is as follows:
wherein Z iseqExpressing an equivalent node impedance matrix of an alternating current system, T expressing transposition, n expressing the total number of current conversion buses in an alternating current-direct current system, MnRepresenting the correlation vector of the converter busbar n, Z representing the nodal impedance matrix of the AC system, ZeqnnRepresents ZeqThe nth row and the nth column of elements; m1，M2，…MnRespectively expressed as:
……
where k represents the total number of nodes in the ac system.
Determining the short-circuit capacity of the current conversion bus according to the equivalent node impedance;
the capacity formula is as follows:
wherein S isaciIndicating the short-circuit capacity, U, of the converter bus i in a multi-feed DC systemiRepresenting the voltage amplitude, Z, of the converter bus i in a multi-feed DC systemeqiiRepresents ZeqRow i and column i.
Determining the layered direct-current short-circuit ratio of the alternating-current and direct-current systems according to the equivalent node impedance of the alternating-current system and the short-circuit capacity of the direct-current conversion bus;
the short circuit ratio equation is as follows:
wherein, SSCRiRepresenting the DC short-circuit ratio, P, of the converter bus i in a hierarchical DC systemdiRepresenting the DC power, P, of a converter bus i in a layered DC systemdsFor the direct current power, P, of another end of the converter bus s in a layered direct current systemdjIs the direct current power, Z, of other commutation buses in the AC-DC system except the commutation bus ieqijRepresents ZeqRow i, column j element of (2), ZeqsiRepresents ZeqS-th row, i-th column element, Zeqss represents ZeqRow s and column s.
And judging the short circuit ratio of the layered direct current access system in a receiving end access mode according to the strength index of the alternating current-direct current system, and determining the optimal drop point of the layered direct current access.
The invention is illustrated by example 1 and example 2.
Establishing an equivalent node impedance matrix of the alternating current system with layered direct current falling points respectively as a current conversion bus i and a current conversion bus s:
example 1
Taking a certain power grid with A, B layered direct current access as an example, determining that the number of a 500kV converter bus of layered direct current a is 1, the number of a 1000kV converter bus is 2, the number of a 500kV converter bus of layered direct current B is 3, and the number of a 1000kV converter bus is 4, then the corresponding equivalent node impedance matrix is:
calculating the short-circuit capacity of the direct current conversion bus according to the equivalent node impedance of the alternating current system:
determining the layered direct-current short-circuit ratio of the alternating-current and direct-current system according to the equivalent node impedance of the alternating-current system and the short-circuit capacity of the direct-current conversion bus:
the laminated dc short-circuit ratios of the other commutation buses were calculated as SSCR 2-2.53, SSCR 3-2.18, and SSCR 4-2.37, respectively.
Respectively calculating the direct current short circuit ratio of different drop points of the layered direct current access according to the steps:
example 2
The drop point of the layered dc B is not changed, the drop point of the layered dc a is changed, the 500kV converter bus number of the layered dc a in the new grid structure is 1, the 1000kV converter bus number is 2, the 500kV converter bus number of the layered dc B is 3, and the 1000kV converter bus number is 4, and the above steps are performed to obtain the layered dc short-circuit ratios of SSCR 1-3.10, SSCR 2-3.07, SSCR 3-2.26, and SSCR 4-2.46, respectively.
According to the indexes representing the strength of the alternating current and direct current system, further determining the optimal drop point of the layered direct current access:
comparing the layered direct current short circuit ratios under the two power grid architectures, it can be seen that the short circuit ratio under the second scheme is larger than that under the first scheme, and then the falling point under the second scheme is determined to be the optimal falling point of the layered direct current.
The present invention further provides a system 200 for determining an optimal drop point of a receiving end of a hierarchical dc access system, as shown in fig. 2, including:
the first calculation module 201 determines n drop points of a layered direct current access receiving end system, establishes an equivalent node impedance matrix of the alternating current system when the layered direct current drop points are i and s, and determines equivalent node impedance;
the i and the s are any layered direct current drop points;
the impedance matrix is as follows:
wherein Z iseqExpressing an equivalent node impedance matrix of an alternating current system, T expressing transposition, n expressing the total number of current conversion buses in an alternating current-direct current system, MnRepresenting the correlation vector of the converter busbar n, Z representing the nodal impedance matrix of the AC system, ZeqnnRepresents ZeqThe nth row and the nth column of elements; m1，M2，…MnRespectively expressed as:
……
where k represents the total number of nodes in the ac system.
The second calculation module 202 determines the short-circuit capacity of the commutation bus according to the equivalent node impedance;
the capacity formula is as follows:
wherein S isaciIndicating the short-circuit capacity, U, of the converter bus i in a multi-feed DC systemiRepresenting the voltage amplitude, Z, of the converter bus i in a multi-feed DC systemeqiiRepresents ZeqRow i and column i.
The third calculation module 203 determines the layered direct-current short-circuit ratio of the alternating-current and direct-current systems according to the equivalent node impedance of the alternating-current system and the short-circuit capacity of the direct-current conversion bus;
the short circuit ratio equation is as follows:
wherein, SSCRiRepresenting the DC short-circuit ratio, P, of the converter bus i in a hierarchical DC systemdiRepresenting the DC power, P, of a converter bus i in a layered DC systemdsFor the direct current power, P, of another end of the converter bus s in a layered direct current systemdjIs the direct current power, Z, of other commutation buses in the AC-DC system except the commutation bus ieqijRepresents ZeqRow i, column j element of (2), ZeqsiRepresents ZeqS-th row, i-th column element, Zeqss represents ZeqRow s and column s.
The drop point determining module 204 determines a short circuit ratio in a receiving end access mode of the layered dc access system according to the ac/dc system strength index, and further determines an optimal drop point of the layered dc access.
The invention ensures the safe and stable operation of the alternating current and direct current system of the extra-high voltage layered direct current access, selects the optimal drop point of the layered direct current access according to the direct current short circuit ratio, and provides a judgment basis for planning and operation for power workers.

Claims (10)

1. A method for determining a best drop point of a receiving end of a hierarchical dc access system, the method comprising:
determining n drop points of a layered direct current access receiving end system, establishing an equivalent node impedance matrix of the alternating current system when the layered direct current drop points are i and s, and determining equivalent node impedance;
the i and the s are any layered direct current drop points;
determining the short-circuit capacity of the current conversion bus according to the equivalent node impedance;
determining the layered direct-current short-circuit ratio of the alternating-current and direct-current systems according to the equivalent node impedance of the alternating-current system and the short-circuit capacity of the direct-current conversion bus;
and determining the optimal drop point of the layered direct current access according to the index representing the strength of the alternating current and direct current system.
2. The method of claim 1, wherein the impedance matrix is given by:
wherein Z iseqExpressing an equivalent node impedance matrix of an alternating current system, T expressing transposition, n expressing the total number of current conversion buses in an alternating current-direct current system, MnRepresenting the correlation vector of the converter busbar n, Z representing the nodal impedance matrix of the AC system, ZeqnnRepresents ZeqThe nth row and the nth column of elements; m1，M2，…MnRespectively expressed as:
……
where k represents the total number of nodes in the ac system.
3. The method according to claim 1, wherein the short-circuit capacity of the dc converter bus is calculated according to the equivalent node impedance of the ac system, and the capacity formula is as follows:
wherein,Saciindicating the short-circuit capacity, U, of the converter bus i in a multi-feed DC systemiRepresenting the voltage amplitude, Z, of the converter bus i in a multi-feed DC systemeqiiRepresents ZeqRow i and column i.
4. The method according to claim 1, wherein the layered dc short-circuit ratio of the ac/dc system is determined according to the equivalent node impedance of the ac system and the short-circuit capacity of the dc converter bus, and the short-circuit ratio formula is as follows:
wherein, SSCRiRepresenting the DC short-circuit ratio, P, of the converter bus i in a hierarchical DC systemdiRepresenting the DC power, P, of a converter bus i in a layered DC systemdsFor the direct current power, P, of another end of the converter bus s in a layered direct current systemdjIs the direct current power, Z, of other commutation buses in the AC-DC system except the commutation bus ieqijRepresents ZeqRow i, column j element of (2), ZeqsiRepresents ZeqS-th row, i-th column element, Zeqss represents ZeqRow s and column s.
5. The method according to claim 1, wherein the step of determining the optimal drop point of the layered direct current access according to the index representing the strength of the alternating current/direct current system specifically comprises:
and judging the short circuit ratio of the layered direct current access system in a receiving end access mode according to the strength index of the alternating current-direct current system, and determining the optimal drop point of the layered direct current access.
6. A system for determining a best drop point of a receiving end of a hierarchical dc access system, the system comprising:
the first calculation module is used for determining n drop points of a layered direct current access system, establishing an equivalent node impedance matrix of the alternating current system when the layered direct current drop points are i and s, and determining equivalent node impedance;
the i and the s are any layered direct current drop points;
the second calculation module is used for determining the short-circuit capacity of the commutation bus according to the equivalent node impedance;
the third calculation module is used for determining the layered direct-current short-circuit ratio of the alternating-current and direct-current system according to the equivalent node impedance of the alternating-current system and the short-circuit capacity of the direct-current conversion bus;
and the drop point determining module is used for determining the optimal drop point of the layered direct current access according to the index representing the strength of the alternating current-direct current system.
7. The system of claim 6, wherein the impedance matrix is given by:
wherein Z iseqExpressing an equivalent node impedance matrix of an alternating current system, T expressing transposition, n expressing the total number of current conversion buses in an alternating current-direct current system, MnRepresenting the correlation vector of the converter busbar n, Z representing the nodal impedance matrix of the AC system, ZeqnnRepresents ZeqThe nth row and the nth column of elements; m1，M2，…MnRespectively expressed as:
……
where k represents the total number of nodes in the ac system.
8. The system of claim 6, wherein the short circuit capacity of the dc converter bus is calculated based on the equivalent node impedance of the ac system, and the capacity formula is as follows:
wherein S isaciIndicating the short-circuit capacity, U, of the converter bus i in a multi-feed DC systemiRepresenting the voltage amplitude, Z, of the converter bus i in a multi-feed DC systemeqiiRepresents ZeqRow i and column i.
9. The system of claim 6, wherein the layered DC short-circuit ratio of the AC/DC system is determined according to the equivalent node impedance of the AC system and the short-circuit capacity of the DC converter bus, and the short-circuit ratio formula is as follows:
wherein, SSCRiRepresenting the DC short-circuit ratio, P, of the converter bus i in a hierarchical DC systemdiRepresenting the DC power, P, of a converter bus i in a layered DC systemdsFor the direct current power, P, of another end of the converter bus s in a layered direct current systemdjIs the direct current power, Z, of other commutation buses in the AC-DC system except the commutation bus ieqijRepresents ZeqRow i, column j element of (2), ZeqsiRepresents ZeqS-th row, i-th column element, Zeqss represents ZeqRow s and column s.
10. The system according to claim 6, wherein the determining the optimal drop point of the layered dc access according to the index representing the strength of the ac/dc system specifically comprises:
and judging the short circuit ratio of the layered direct current access system in a receiving end access mode according to the strength index of the alternating current-direct current system, and further determining the optimal drop point of the layered direct current access.
CN201910218156.XA 2019-03-21 2019-03-21 A kind of method and system of the determining layering best drop point of direct current access system receiving end Pending CN110048446A (en)

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CN112068027B (en) * 2020-08-26 2023-01-17 华北电力大学 Method for identifying short-circuit ratio of flexible direct-current transmission alternating-current system
CN112054515A (en) * 2020-08-28 2020-12-08 武汉大学 Receiving-end power grid DC receiving capacity detection method based on multi-objective optimization

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