CN113675872A - Multi-direct-current simultaneous commutation failure coordination recovery ordering method based on sending end stability constraint - Google Patents

Multi-direct-current simultaneous commutation failure coordination recovery ordering method based on sending end stability constraint Download PDF

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CN113675872A
CN113675872A CN202110989112.4A CN202110989112A CN113675872A CN 113675872 A CN113675872 A CN 113675872A CN 202110989112 A CN202110989112 A CN 202110989112A CN 113675872 A CN113675872 A CN 113675872A
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direct current
direct
current
recovery
simultaneous
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CN113675872B (en
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周泓
魏明奎
蔡绍荣
江栗
路亮
陶宇轩
沈力
梁文举
文一宇
张鹏
王庆
杨宇霄
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Southwest Branch of State Grid Corp
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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
    • 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
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • 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
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • 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 belongs to the technical field of power systems and automation thereof, and discloses a multi-direct-current simultaneous commutation failure coordination recovery sequencing method based on sending end stability constraint. Classifying and grouping direct currents in a researched power grid framework, calculating interaction factors among direct currents in a target simultaneous transmission and receiving direct current group, evaluating the interaction degree among the direct currents in the group according to the interaction factors, and selecting the direct current with high coupling degree for optimization; evaluating the direct current intensity of each direct current group of the same-transmitting and receiving direct current, calculating a network equivalence and node impedance matrix according to the data of the researched power grid area, and calculating the multi-feed short circuit ratio of each direct current in the group according to the node impedance matrix; and calculating to obtain the priority index of the multi-direct-current simultaneous phase commutation recovery after the phase commutation failure according to the direct-current strength, the direct-current dynamic reactive power support index and the maximum phase commutation failure frequency, and obtaining the priority sequence of the multi-direct-current coordination recovery from the small and large sequences. The method can provide strategic support for the safe and stable operation control of the direct current group simultaneously transmitted and received by the power grid.

Description

Multi-direct-current simultaneous commutation failure coordination recovery ordering method based on sending end stability constraint
Technical Field
The invention belongs to the technical field of power systems and automation thereof, and particularly relates to a multi-direct-current simultaneous commutation failure coordination recovery sequencing method based on sending end stability constraint.
Background
With the increasing maturity of the direct current transmission technology, the economy and the reliability are greatly improved, and the direct current transmission technology is widely applied by the technical advantages that the power adjustment is rapid and flexible, and the transmission distance is not limited by the stability of synchronous operation. In recent years, with the operation of large-scale direct current projects, the drop points of direct current transmitting ends and receiving ends are increasingly dense, the coupling effect between alternating current and direct current is enhanced, a large-scale alternating current and direct current hybrid power transmission system is formed, the structure of a power grid is deeply changed, and the characteristics of the power grid are greatly changed.
For a sending-end alternating current system, if a receiving-end alternating current system fails to cause simultaneous phase commutation failure or successive phase commutation failure of direct currents, each direct current will cause power impact on the sending-end alternating current system, and superimposed huge energy impact will cause problems of sending-end voltage, frequency and the like, possibly causing risks of direct current blocking, new energy source off-line and the like. For a receiving-end alternating current system, if the electrical distance of each direct current inversion station is short, the electrical coupling of a current conversion bus is tight, a single alternating current fault can cause multiple direct currents to simultaneously or sequentially generate serious faults such as phase conversion failure and the like, and huge reactive power required in the direct current recovery process can cause the voltage problem of a receiving-end power grid and seriously affect the safe and stable operation of the receiving-end power grid; especially, in the access system of simultaneous transmission and receiving of direct current, the failure of simultaneous commutation of multiple direct currents caused by single alternating current fault can cause huge power impact on the transmission end system, and the problem of stable frequency of the transmission end power grid is caused. Therefore, how to optimize the recovery sequence after the simultaneous commutation failure of the same-transmission and same-reception direct currents, reduce the power impact of the simultaneous commutation failure of multiple direct currents on the power grid at the sending end, accelerate the recovery of the direct current power after the commutation failure, and have very important significance on the safe and stable operation of the power grid at the sending end.
Disclosure of Invention
The invention provides a sending end stability constraint-based multi-direct-current simultaneous commutation failure coordination recovery sequencing method, which aims to solve the technical problems mentioned in the background technology, comprehensively considers the interaction among direct currents in a sending and receiving direct-current group, the maximum commutation failure times borne by the direct currents, a direct-current receiving end converter station and the dynamic reactive power support indexes of a primary section of the direct-current receiving end converter station, provides a multi-direct-current recovery priority sequence under the simultaneous commutation failure, and provides a strategy support for the safety and stability control of a power grid.
The technical scheme is adopted to solve the technical problems;
the coordination recovery ordering method for multiple direct current simultaneous commutation failures based on sending end stability constraint comprises the following steps:
step S1: grouping a plurality of direct currents in the power grid frame according to actual power grid data containing a plurality of direct current models and parameters, selecting a simultaneous transmission and receiving direct current group with the largest impact on a transmitting end power grid due to simultaneous commutation failure as a research object, and recording the number of the direct currents in the simultaneous transmission and receiving direct current group as n;
step S2: calculating each direct current interaction factor in the group;
step S2.1: switching a group of capacitors on a current conversion bus at an inversion side to generate disturbance according to the rated power running state of the ith return direct current transmission system, so that the voltage of the ith return direct current conversion bus generates a disturbance quantity delta U of about 1 percentiAnd collecting voltage fluctuation delta U of the commutation bus at the jth return DC inversion sidej；
Step S2.2: taking the disturbance quantity delta U of the ith-turn DC inversion side commutation bus voltageiVoltage fluctuation delta U of commutation bus on jth DC inversion sidejThe ratio of (a) to (b) is an interaction factor between the ith return direct current and the jth return direct current;
if the interaction factor is greater than the threshold K, go directly to step S3; otherwise, the coordination is not needed, and the process is directly finished;
step S3: calculating the effective short circuit ratio of each direct current in the simultaneous transmission and reception direct current group according to the network equivalence and the node impedance matrix result:
Figure BDA0003231845370000021
in formula (1), MESCRiThe effective short circuit ratio of the ith return direct current; saciShort-circuit capacity of the ith return DC/AC side; qciThe reactive compensation quantity is parallel connected on the ith return direct current alternating current side conversion bus; pdeqiThe equivalent direct current power after other direct current influences are considered; zeqiiThe equivalent impedance is the i-th return direct current side; zciThe ith return direct current is connected with equivalent impedance of reactive compensation in parallel; zeqijThe equivalent mutual impedance between the ith return direct current and the jth return direct current alternating current side; pdiThe direct current power is the direct current power of the ith return direct current; pdjThe j-th return direct current power;
step S4: calculating dynamic reactive power support indexes of each direct current receiving end converter station and a first-stage section of each direct current receiving end converter station;
step S5: determining the maximum commutation failure times N that each direct current in the group can bear according to the stability constraint conditions of the alternating current system at the transmitting end and the receiving end, wherein the stability constraint conditions comprise voltage, frequency and power angle;
step S6: calculating a priority index of multi-direct current coordination recovery in the co-transmitting and receiving direct current group according to the results obtained in the steps S3, S4 and S5;
step S7: outputting a priority ranking result of multi-direct current coordination recovery in the co-transmitting and receiving direct current group according to the index of the step S6;
further, the simultaneous transmitting and receiving dc group is a plurality of dc with transmitting end falling points in the same synchronous ac system and receiving end falling points in the same synchronous ac system.
Further, the step S1 of selecting the sending and receiving dc group with the largest simultaneous commutation failure impact on the sending-end power grid as the research object means that the sending and receiving dc group with the largest impact on the sending-end power grid is determined according to the offline simulation result of the multiple sending and receiving dc groups with the largest simultaneous commutation failure.
Further, the interaction factor threshold K may be a value according to an actual engineering situation, and may generally be a value of 0.15.
Further, the step S4 of calculating the dynamic reactive power support index of each dc receiving end converter station and the first-stage cross section thereof includes:
step S4.1: counting dynamic reactive compensation Q of jth return DC converter stationzjDynamic reactive compensation Q connected with current conversion side bus at one-stage sectionxjSum Qsj. The dynamic reactive compensation comprises a phase modulator, a Static Var Compensator (SVC) and a static synchronous compensator (STATCOM).
Step S4.2: and (3) calculating the dynamic reactive power support capability of each direct current of the same transmission and reception to the ith return direct current according to the formula (2).
Figure BDA0003231845370000031
In the formula (2), AiDynamic reactive power supporting capacity of each direct current pair ith return direct current for simultaneous transmission and reception; MIIFijThe interaction factor between the ith return direct current and the jth return direct current is defined; qsjDynamic reactive compensation Q for jth return DC converter stationzjAnd a converter station busDynamic reactive compensation Q of line-connected first-stage sectionxjAnd (4) summing.
Further, the method for calculating the priority index of the multi-dc coordinated restoration in step S6 is as follows:
Figure BDA0003231845370000032
in the formula (3), WiThe priority index of the ith return direct current recovery; pdciThe transmission power of the ith return direct current;
Figure BDA0003231845370000033
the total power of n simultaneous transmission and receiving direct current transmission; n is a radical ofiThe maximum commutation failure times which the ith return direct current can bear; MIESCRiThe effective short circuit ratio of the ith return direct current; a. theiAnd (5) the ith return direct current dynamic reactive power support index.
Further, the method for determining the priority of the output co-transmission and multi-dc coordinated recovery in step S7 is as follows:
sorting coordination recovery priority indexes of n direct currents sent to and received from the same time into W from small to large1、W2、W3、W4......Wn. The smaller the priority index of multi-direct-current coordinated recovery is, the higher the recovery priority of the direct current is, and the larger the priority index is, the lower the recovery priority of the direct current is. The recovery priority of the n direct currents sent and received simultaneously is as follows: w1、W2、W3、W4......Wn。
Compared with the prior art, the invention has the beneficial effects that: considering that the drop points of the direct current sending end and the receiving end are increasingly dense and the electrical coupling effect is gradually tight, the failure of one direct current commutation may cause the simultaneous commutation failure of other multiple direct currents with strong electrical coupling effect, and great power impact is caused to the power grid to seriously affect the risk of safe and stable operation of the power grid. Therefore, the invention provides a sending end stability constraint-based multi-direct-current simultaneous commutation failure coordination recovery sequencing method, which comprehensively considers the interaction among direct currents in a sending and receiving direct-current group, the maximum commutation failure times of the direct currents, a direct-current receiving end converter station and a dynamic reactive power support index of a first-stage section of the direct-current receiving end converter station, gives the priority of multi-direct-current coordination recovery under simultaneous commutation failure, can maximize multi-direct-current recovery efficiency, reduces the power impact of the sending end power grid caused by the simultaneous commutation failure of the sending and receiving direct-current groups, and provides a strategy support for the safety and stability control of the power grid.
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FIG. 1 is a flow chart of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to FIG. 1, a preferred embodiment of the present invention will be further described;
the coordination recovery ordering method for multiple direct current simultaneous commutation failures based on sending end stability constraint comprises the following steps:
step S1: according to actual power grid data containing multiple direct current models and parameters, grouping multiple direct currents in the power grid framework, selecting a simultaneous-transmission and simultaneous-reception direct current group with the largest impact on a transmitting-end power grid due to simultaneous commutation failure as a research object, and recording the number of direct current bars in the simultaneous-transmission and simultaneous-reception direct current group as n. Wherein, the simultaneous-transmitting and simultaneous-receiving direct current group is a plurality of direct currents of which the transmitting end is positioned in the same synchronous alternating current system and the receiving end is positioned in the same synchronous alternating current system; the simultaneous transmission and reception direct-current group with the largest impact on the power grid of the transmitting end due to the phase change failure is determined according to an off-line simulation result of the simultaneous phase change failure of the multiple simultaneous transmission and reception direct-current groups.
Step S2: and calculating each direct current interaction factor in the group. Firstly, switching is carried out on a current conversion bus at an inversion side according to the condition that the ith return direct current transmission system is in a rated power operation stateA group of capacitors for generating disturbance, so that the ith DC conversion bus voltage generates a disturbance quantity delta U of about 1%iAnd collecting voltage fluctuation delta U of the commutation bus at the jth return DC inversion sidej. Secondly, the disturbance quantity delta U of the ith return DC inversion side commutation bus voltage is takeniVoltage fluctuation delta U of commutation bus on jth DC inversion sidejThe ratio of (d) is the interaction factor between the ith return direct current and the jth return direct current. Finally, if the interaction factor is greater than the threshold K (which can be a value according to the actual situation of the project, usually can be a value of 0.15), directly entering step S3; otherwise, the coordination is not needed, and the process is finished directly.
Step S3 calculates the effective short-circuit ratio of each dc in the co-current and receiving dc groups according to the network equivalent and node impedance matrix result.
Figure BDA0003231845370000041
In formula (1), MESCRiThe effective short circuit ratio of the ith return direct current; saciShort-circuit capacity of the ith return DC/AC side; qciThe reactive compensation quantity is parallel connected on the ith return direct current alternating current side conversion bus; pdeqiThe equivalent direct current power after other direct current influences are considered; zeqiiThe equivalent impedance is the i-th return direct current side; zciThe ith return direct current is connected with equivalent impedance of reactive compensation in parallel; zeqijThe equivalent mutual impedance between the ith return direct current and the jth return direct current alternating current side; pdiThe direct current power is the direct current power of the ith return direct current; pdjJ, returning the direct current power of the direct current.
Step S4: and calculating the dynamic reactive power support indexes of each direct current receiving end converter station and the first-stage section of the direct current receiving end converter station. Calculating the dynamic reactive power support indexes of each direct current receiving end converter station and the first-stage section of each direct current receiving end converter station comprises the following steps: counting dynamic reactive compensation Q of jth return DC converter stationzjDynamic reactive compensation Q connected with current conversion side bus at one-stage sectionxjSum Qsj. The dynamic reactive compensation comprises a phase modulator, a Static Var Compensator (SVC) and a static synchronous compensator (STATCOM).
And (3) calculating the dynamic reactive power support capability of each direct current of the same transmission and reception to the ith return direct current according to the formula (2).
Figure BDA0003231845370000051
In the formula (2), AiDynamic reactive power supporting capacity of each direct current pair ith return direct current for simultaneous transmission and reception; MIIFijThe interaction factor between the ith return direct current and the jth return direct current is defined; qsjDynamic reactive compensation Q for jth return DC converter stationzjDynamic reactive compensation Q connected with one-stage section of bus of converter stationxjAnd (4) summing.
Step S5: and determining the maximum commutation failure times N that each direct current in the group can bear according to the stability constraint conditions of the alternating current system at the transmitting end and the receiving end, wherein the stability constraint conditions comprise voltage, frequency and power angle.
Step S6: and calculating the priority index of the multi-DC coordinated recovery in the co-transmitting and receiving DC group according to the results obtained in the steps S of S3, S4 and S5. The method for calculating the priority index of multi-direct-current coordination recovery comprises the following steps:
Figure BDA0003231845370000052
in the formula (3), WiThe priority index of the ith return direct current recovery; pdciThe transmission power of the ith return direct current;
Figure BDA0003231845370000053
the total power of n simultaneous transmission and receiving direct current transmission; n is a radical ofiThe maximum commutation failure times which the ith return direct current can bear; MIESCRiThe effective short circuit ratio of the ith return direct current; a. theiAnd (5) the ith return direct current dynamic reactive power support index.
Step S7: and outputting the priority ranking result of the multi-DC coordinated recovery in the co-transmitting and receiving DC group according to the index of the step S6. The priority sequencing determination method for the simultaneous transmission and reception multi-direct-current coordination recovery comprises the following steps:
the recovery priority indexes of the n direct currents sent to and received from the same station are sorted into W1, W2, W3 and W4 … … Wn from small to large. The smaller the priority index of multi-direct-current coordinated recovery is, the higher the recovery priority of the direct current is, and the larger the priority index is, the lower the recovery priority of the direct current is. The recovery priority of the n direct currents sent and received simultaneously is as follows: w1, W2, W3 and W4 … … Wn.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (7)

1. A multi-direct-current simultaneous commutation failure coordination recovery ordering method based on sending end stability constraint is characterized in that: the method comprises the following steps of:
step S1: grouping a plurality of direct currents in the power grid frame according to actual power grid data containing a plurality of direct current models and parameters, selecting a simultaneous transmission and receiving direct current group with the largest impact on a transmitting end power grid due to simultaneous commutation failure as a research object, and recording the number of the direct currents in the simultaneous transmission and receiving direct current group as n;
step S2: calculating each direct current interaction factor in the group;
step S2.1: according to the i-th return direct current transmission system at rated valueWhen the power is in a running state, a group of capacitors is switched on a current conversion bus at the inversion side to generate disturbance, so that the voltage of the ith return direct current conversion bus generates a disturbance quantity delta U of about 1 percentiAnd collecting voltage fluctuation delta U of the commutation bus at the jth return DC inversion sidej；
Step S2.2: taking the disturbance quantity delta U of the ith-turn DC inversion side commutation bus voltageiVoltage fluctuation delta U of commutation bus on jth DC inversion sidejThe ratio of (a) to (b) is an interaction factor between the ith return direct current and the jth return direct current;
if the interaction factor is greater than the threshold K, go directly to step S3; otherwise, the coordination is not needed, and the process is directly finished;
step S3: calculating the effective short circuit ratio of each direct current in the simultaneous transmission and reception direct current group according to the network equivalence and the node impedance matrix result:
Figure FDA0003231845360000011
in formula (1), MESCRiThe effective short circuit ratio of the ith return direct current; saciShort-circuit capacity of the ith return DC/AC side; qciThe reactive compensation quantity is parallel connected on the ith return direct current alternating current side conversion bus; pdeqiThe equivalent direct current power after other direct current influences are considered; zeqiiThe equivalent impedance is the i-th return direct current side; zciThe ith return direct current is connected with equivalent impedance of reactive compensation in parallel; zeqijThe equivalent mutual impedance between the ith return direct current and the jth return direct current alternating current side; pdiThe direct current power is the direct current power of the ith return direct current; pdjThe j-th return direct current power;
step S4: calculating dynamic reactive power support indexes of each direct current receiving end converter station and a first-stage section of each direct current receiving end converter station;
step S5: determining the maximum commutation failure times N that each direct current in the group can bear according to the stability constraint conditions of the alternating current system at the transmitting end and the receiving end, wherein the stability constraint conditions comprise voltage, frequency and power angle;
step S6: calculating a priority index of multi-direct current coordination recovery in the co-transmitting and receiving direct current group according to the results obtained in the steps S3, S4 and S5;
step S7: and outputting the priority ranking result of the multi-DC coordinated recovery in the co-transmitting and receiving DC group according to the index of the step S6.
2. The sending-end stability constraint-based multi-direct-current simultaneous commutation failure coordination recovery ordering method according to claim 1, characterized in that: the simultaneous-transmitting and simultaneous-receiving direct current group is a plurality of direct currents of which the transmitting end is located in the same synchronous alternating current system and the receiving end is located in the same synchronous alternating current system.
3. The sending-end stability constraint-based multi-direct-current simultaneous commutation failure coordination recovery ordering method according to claim 1, characterized in that: the step S1 of selecting the sending and receiving dc group with the largest simultaneous commutation failure impact on the sending-end power grid as the research object means that the sending and receiving dc group with the largest impact on the sending-end power grid is determined according to the offline simulation result of the multiple sending and receiving dc groups with the largest simultaneous commutation failure.
4. The sending-end stability constraint-based multi-direct-current simultaneous commutation failure coordination recovery ordering method according to claim 1, characterized in that: the interaction factor threshold K may be a value according to an actual engineering situation, and may generally be 0.15.
5. The sending-end stability constraint-based multi-direct-current simultaneous commutation failure coordination recovery ordering method according to claim 1, characterized in that: in step S4, the calculating the dynamic reactive power support index of each dc receiving end converter station and its first-stage cross section includes:
step S4.1: counting dynamic reactive compensation Q of jth return DC converter stationzjDynamic reactive compensation Q connected with current conversion side bus at one-stage sectionxjSum Qsj(ii) a The dynamic reactive compensation comprises a phase modulator, a Static Var Compensator (SVC) and a static synchronous compensator (STATCOM);
step S4.2: calculating the dynamic reactive power support capability of each direct current of the same transmission and reception to the ith return direct current according to the formula (2);
Figure FDA0003231845360000021
in the formula (2), AiDynamic reactive power supporting capacity of each direct current pair ith return direct current for simultaneous transmission and reception; MIIFijThe interaction factor between the ith return direct current and the jth return direct current is defined; qsjDynamic reactive compensation Q for jth return DC converter stationzjDynamic reactive compensation Q connected with one-stage section of bus of converter stationxjAnd (4) summing.
6. The sending-end stability constraint-based multi-direct-current simultaneous commutation failure coordination recovery ordering method according to claim 1, characterized in that: the method for calculating the priority index of the multi-dc coordinated restoration in step S6 is as follows:
Figure FDA0003231845360000022
in the formula (3), WiThe priority index of the ith return direct current recovery; pdciFor i-th return DC power transmission
Figure FDA0003231845360000023
The total power of n simultaneous transmission and receiving direct current transmission; n is a radical ofiThe maximum commutation failure times which the ith return direct current can bear; MIESCRiThe effective short circuit ratio of the ith return direct current; a. theiAnd (5) the ith return direct current dynamic reactive power support index.
7. The sending-end stability constraint-based multi-direct-current simultaneous commutation failure coordination recovery ordering method according to claim 1, characterized in that: the method for determining the priority of the output simultaneous transmission and reception multi-dc coordinated recovery in step S7 is as follows:
the coordination recovery priority indexes of the n direct currents sent and received simultaneously are reduced byBig rank of W1、W2、W3、W4……Wn(ii) a The smaller the priority index of multi-direct-current coordinated recovery is, the higher the recovery priority of the direct current is, and the larger the priority index is, the lower the recovery priority of the direct current is; the recovery priority of the n direct currents sent and received simultaneously is as follows: w1、W2、W3、W4……Wn。
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