CN113300397A - Alternating current-direct current reactive power exchange reference value optimization method and system - Google Patents

Alternating current-direct current reactive power exchange reference value optimization method and system Download PDF

Info

Publication number
CN113300397A
CN113300397A CN202110550104.XA CN202110550104A CN113300397A CN 113300397 A CN113300397 A CN 113300397A CN 202110550104 A CN202110550104 A CN 202110550104A CN 113300397 A CN113300397 A CN 113300397A
Authority
CN
China
Prior art keywords
reactive power
power exchange
current
direct current
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN202110550104.XA
Other languages
Chinese (zh)
Inventor
张红丽
刘福锁
余思聪
倪禛霖
王玉
李威
薛峰
李兆伟
常海军
吴雪莲
郜建良
雷杰
朱玲
赵学茂
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nari Technology Co Ltd
State Grid Electric Power Research Institute
Original Assignee
Nari Technology Co Ltd
State Grid Electric Power Research Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nari Technology Co Ltd, State Grid Electric Power Research Institute filed Critical Nari Technology Co Ltd
Priority to CN202110550104.XA priority Critical patent/CN113300397A/en
Publication of CN113300397A publication Critical patent/CN113300397A/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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]

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses an alternating current and direct current reactive power exchange reference value optimization method and system, which are used for evaluating the reactive power supporting capacity of an alternating current system, acquiring alternating current and direct current reactive power exchange limit values constrained by transient voltage and steady-state voltage on the basis of meeting a preset rule, optimizing the alternating current and direct current reactive power exchange reference value and realizing the optimized operation of a power grid.

Description

Alternating current-direct current reactive power exchange reference value optimization method and system
Technical Field
The invention relates to an alternating current-direct current reactive power exchange reference value optimization method and system, and belongs to the technical field of electric power systems and automation thereof.
Background
The primary energy and the load in China are distributed reversely, so that urgent requirements in the aspects of power supply delivery of western new energy, large-capacity thermal power generating units and the like, power supply of load centers in the middle east, energy conservation, emission reduction and the like are met, the national power grid vigorously develops the ultra-high voltage direct current technology suitable for long-distance and large-capacity power transmission, the capacity of the power grid for optimizing and configuring resources in a large range is remarkably improved, and the scale of the ultra-high voltage direct current power transmission is subjected to step-type improvement.
The AC/DC reactive power exchange reference value is generally set according to the actual reactive power support capability of an accessed AC power grid in a DC design planning stage, and when a DC system runs at a large load, part of reactive power supplies of the AC system can be utilized to achieve the purpose of less-capacity reactive power compensation equipment; when the direct current system operates under a small load, the phase advance capability of the generator can be utilized to absorb partial over-compensation reactive power of the converter station, so that the purpose of installing less inductive reactive power compensation equipment is achieved. This ability of the ac system to assist the converter station in reactive balancing is called reactive support capability. The reactive power support capability of the alternating current system is fully utilized, the reactive power compensation capacity of the converter station can be reduced, the investment of reactive power compensation equipment such as a capacitor and a reactor is saved, the grouping of the reactive power compensation equipment can be reduced, the investment of corresponding power transformation equipment and control protection equipment is saved, when the direct current system is suddenly stopped, the load shedding overvoltage level can be reduced, and the manufacturing cost of the converter station equipment is correspondingly reduced.
Therefore, in order to optimize the operation of the power grid, it is necessary to reasonably optimize the ac/dc reactive power exchange reference value by using the reactive support capability of the ac system.
Disclosure of Invention
The invention provides an alternating current-direct current reactive power exchange reference value optimization method and system, and solves the problems disclosed in the background technology.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method for optimizing AC/DC reactive power exchange reference value comprises,
calculating the reactive support capability of the alternating current system under different step powers of direct current;
if the reactive power supporting capability meets a preset rule, calculating the transient overvoltage and steady-state overvoltage limiting conditions of an alternating current bus of the converter station under the direct current fault, and respectively obtaining an alternating current-direct current reactive power exchange limit value constrained by the transient voltage and an alternating current-direct current reactive power exchange limit value constrained by the steady-state voltage;
and optimizing the AC/DC reactive power exchange reference value according to the AC/DC reactive power exchange limit value constrained by the transient voltage and the AC/DC reactive power exchange limit value constrained by the steady-state voltage.
The preset rule is that the reactive support capacity is greater than a threshold value.
The reactive support capability of an alternating current system under different step powers of direct current is measured by an effective short circuit ratio.
The effective short-circuit ratio is calculated by the formula,
Figure BDA0003075108360000021
wherein, ESCRiIs the effective short circuit ratio; saciFor conversion of dc currentShort circuit capacity of the AC bus; qciWhen the voltage of an alternating current bus of the converter station is a rated value, the direct current system is used for providing reactive power output of reactive power compensation equipment arranged on the converter bus; pdNiThe power is stepped by direct current.
Calculating the transient overvoltage limitation condition of the alternating current bus of the converter station under the direct current fault to obtain the alternating current-direct current reactive power exchange limit value restricted by the transient voltage,
calculating the transient overvoltage limitation condition of the alternating-current bus of the converter station under the direct-current fault, and taking the condition of the most serious transient overvoltage after the direct-current fault as a transient voltage limitation fault S1;
and limiting the transient voltage of the alternating-current bus of the converter station after the direct-current fault by taking the highest voltage-withstanding capability of equipment in the converter station as the transient critical voltage, and determining the alternating-current and direct-current reactive power exchange limit value under the constraint of the transient voltage after S1 occurs.
Calculating the steady state overvoltage limiting condition of the alternating current bus of the converter station under the direct current fault to obtain the alternating current-direct current reactive power exchange limit value restricted by the steady state voltage,
calculating the steady-state overvoltage limiting condition of the alternating-current bus of the converter station under the direct-current fault, and taking the condition of the most serious steady-state overvoltage after the direct-current fault as a steady-state voltage limiting fault S2;
and limiting the steady-state voltage of the alternating-current bus of the converter station after the direct-current fault by taking the highest voltage-withstanding capability of equipment in the converter station as the steady-state critical voltage, and determining the alternating-current and direct-current reactive power exchange limit value constrained by the steady-state voltage after S2 occurs.
The formula for optimizing the AC/DC reactive power exchange reference value is as follows,
Qref＝max(QZ+Qex，QW-Qex)
wherein Q isrefThe optimized AC/DC reactive power exchange reference value is obtained; qZThe voltage is an alternating current-direct current reactive power exchange limit value constrained by transient voltage; qWThe voltage is an alternating current-direct current reactive power exchange limit value constrained by steady-state voltage; qexThe dead zone is the reactive power control dead zone.
An alternating current-direct current reactive power exchange reference value optimizing system comprises,
the reactive support capability module: calculating the reactive support capability of the alternating current system under different step powers of direct current;
reactive power exchange extreme value module: if the reactive power supporting capability meets a preset rule, calculating the transient overvoltage and steady-state overvoltage limiting conditions of an alternating current bus of the converter station under the direct current fault, and respectively obtaining an alternating current-direct current reactive power exchange limit value constrained by the transient voltage and an alternating current-direct current reactive power exchange limit value constrained by the steady-state voltage;
an optimization module: and optimizing the AC/DC reactive power exchange reference value according to the AC/DC reactive power exchange limit value constrained by the transient voltage and the AC/DC reactive power exchange limit value constrained by the steady-state voltage.
A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform a method for ac-dc reactive power exchange reference optimization.
A computing device comprising one or more processors, one or more memories, and one or more programs stored in the one or more memories and configured to be executed by the one or more processors, the one or more programs including instructions for performing a method for ac-dc reactive power exchange reference optimization.
The invention achieves the following beneficial effects: according to the method, the reactive support capability of the alternating current system is evaluated, the alternating current and direct current reactive power exchange limit value constrained by the transient voltage and the steady-state voltage is obtained on the basis of meeting the preset rule, the alternating current and direct current reactive power exchange reference value is optimized, and the optimized operation of the power grid is realized.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a graph of the relationship before and after optimization at different power steps.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, a method for optimizing an ac/dc reactive power exchange reference value includes the following steps:
step 1, calculating reactive support capability of an alternating current system under different direct current step powers;
step 2, if the reactive support capability meets a preset rule, calculating transient overvoltage and steady overvoltage limiting conditions of an alternating current bus of the converter station under the direct current fault, respectively obtaining an alternating current-direct current reactive power exchange limit value constrained by transient voltage and an alternating current-direct current reactive power exchange limit value constrained by steady voltage, and turning to the step 2; if the reactive power supporting capability does not meet the preset rule, maintaining the original AC/DC reactive power exchange reference value unchanged;
and 3, optimizing the AC/DC reactive power exchange reference value according to the AC/DC reactive power exchange limit value constrained by the transient voltage and the AC/DC reactive power exchange limit value constrained by the steady-state voltage.
According to the method, the reactive support capability of the alternating current system is calculated firstly, the reactive support capability of the alternating current system is evaluated, the alternating current and direct current reactive exchange limit value constrained by transient voltage and steady-state voltage is obtained on the basis of meeting the preset rule, the alternating current and direct current reactive exchange reference value is optimized, and the optimized operation of the power grid is realized.
The reactive support capability of the alternating current system under the different step powers of the direct current is measured by adopting an effective short circuit ratio; calculating the reactive support capacity, namely calculating the effective short-circuit ratio, wherein the specific formula is as follows:
Figure BDA0003075108360000051
wherein, ESCRiFor effective short-circuit ratio, PdNiFor stepping the power, S, by DCaciShort-circuit capacity, Q, of AC bus for DC conversionciWhen the voltage of the alternating current bus of the converter station is a rated value, the direct current system is used for providing reactive power output of reactive power compensation equipment arranged on the converter bus.
The preset rule is that the reactive support capacity is larger than a threshold value, and the threshold value is set to be 5;specifically, the method comprises the following steps: if ESCRiIf the current value is more than 5, namely a preset rule is met, the direct-current accessed alternating current system is a strong system, the influence of the running state change of the direct current system on the alternating current system is small, and the alternating current-direct current reactive power exchange reference value can be optimized; if ESCRiIf the value is less than or equal to 5, the original AC/DC reactive power exchange reference value is maintained unchanged. And evaluating the reactive support capability through a preset rule, and optimizing the AC/DC reactive exchange reference value under the condition of qualified evaluation.
Before optimization, the reactive power exchange range of an alternating current and direct current system needs to be determined by considering transient voltage and steady voltage constraint of an alternating current bus of a converter station after a direct current fault, namely, the transient overvoltage limitation condition of the alternating current bus of the converter station under the direct current fault is calculated, the alternating current and direct current reactive power exchange limit value constrained by the transient voltage is obtained, the steady overvoltage limitation condition of the alternating current bus of the converter station under the direct current fault is calculated, and the alternating current and direct current reactive power exchange limit value constrained by the steady voltage is obtained.
Calculating the transient overvoltage limiting condition of an alternating current bus of the converter station under the direct current fault to obtain an alternating current-direct current reactive power exchange limit value constrained by the transient voltage, wherein the specific process is as follows:
11) calculating the transient overvoltage limiting condition of the alternating-current bus of the converter station under the direct-current fault (including phase-change failure, locking and restarting), and taking the condition of the most serious transient overvoltage after the direct-current fault as a transient voltage limiting fault S1 according to voltage tracks after different direct-current faults;
12) considering that the equipment in the converter station has requirements for the transient maximum voltage, the short-time maximum voltage withstanding capability U of the equipment in the converter station is usedZ.limThe transient critical voltage is (generally 1.3p.u.), the transient voltage of an alternating current bus of the converter station after the direct current fault is limited, the alternating current-direct current reactive exchange limit value Q under the constraint of the transient voltage after the occurrence of S1 is determined by adjusting the input group number N1 of a direct current filter, changing the alternating current-direct current reactive exchange quantity QZ；
When the DC system is in an overcompensation mode, namely the AC/DC reactive exchange quantity is small, the DC system is not beneficial to transient overvoltage, so that the adjustment direction of the DC filter is to increase the number of filter sets, and the AC/DC reactive exchange quantity is reduced until the AC/DC reactive exchange quantity reaches the set valueTo the minimum value of AC-DC reactive power exchange, i.e. QZ。
Calculating the steady-state overvoltage limiting condition of an alternating current bus of the converter station under the direct current fault to obtain an alternating current-direct current reactive power exchange limit value constrained by steady-state voltage, and the specific process is as follows:
21) calculating the steady-state overvoltage limiting condition of the alternating-current bus of the converter station under the direct-current fault (including phase conversion failure, locking and restarting), and taking the condition of the most serious steady-state overvoltage after the direct-current fault as a steady-state voltage limiting fault S2 according to voltage tracks after different direct-current faults;
22) considering that the equipment in the converter station has requirements for the maximum voltage in the steady state, the maximum voltage withstanding capability U of the equipment in the converter station is used for a long timeW.limThe voltage is generally 550kV, the steady state voltage of an alternating current bus of the converter station after the direct current fault is limited, the alternating current and direct current reactive power exchange quantity Q is changed by adjusting the number of groups N2 of input direct current filters, and the alternating current and direct current reactive power exchange limit value Q restricted by the steady state voltage after the S2 occurs is determinedW；
When the DC system is in an under-compensation mode, i.e. the AC/DC reactive exchange amount is large, it is not favorable for steady-state overvoltage, so that the regulation direction of the DC filter is that the number of filter groups is reduced, the AC/DC reactive exchange amount is increased until the AC/DC reactive exchange maximum value is reached, i.e. Q is obtainedW。
Q obtained as described aboveZAnd QWOptimizing the AC/DC reactive power exchange reference value, specifically as follows:
31) assuming that the positive direction is the reactive power of the DC system, Q isWIs constantly greater than QZTherefore, the AC/DC reactive power exchange range is [ Q ]Z,QW]；
32) According to a direct current complete design book, a reactive control dead zone is obtained, and the alternating current-direct current reactive exchange quantity Q meets the following requirements:
Figure BDA0003075108360000071
wherein Q isexThe dead zone is a reactive power control dead zone;
33) the AC/DC reactive power exchange reference value meeting the AC/DC reactive power exchange limit value constraint is as follows:
Qref＝max(QZ+Qex，QW-Qex)
wherein Q isrefThe method is an optimized AC/DC reactive power exchange reference value.
In order to verify the method, direct current with rated capacity of 8000MW in a regional power grid in China is taken as an example for research, a direct current reactive power control dead zone is 236Mvar, when the direct current power of an original alternating current-direct current reactive power exchange reference value is smaller than 4000MW, the reactive power exchange reference value is 0Mvar, and after the direct current power is larger than 4000MW, the reactive power exchange reference value is gradually increased to 600Mvar for setting.
The effective short-circuit ratios for DC power at the step powers of 2000MW, 4000MW, 6000MW, 8000MW are shown in Table 1:
TABLE 1 effective short-circuit ratio at different powers of a converter station
Figure BDA0003075108360000072
Figure BDA0003075108360000081
As can be seen from table 1, the ac system to which the dc is connected is a strong system, and the change in the operating state of the dc system has little influence on the ac system, and can optimize the ac/dc reactive power exchange reference value.
Comparing the voltage locus of the bus of the converter station under the disturbance of locking, restarting and commutation failure of the direct current, wherein the steady state voltage rise is highest when the direct current is locked, so that the direct current locking fault is taken as a transient state/steady state voltage limited fault; respectively taking the transient state/steady state voltage of an alternating current bus of the converter station after the direct current blocking fault does not exceed 1.3p.u./550kV as a standard, taking the reactive power of a direct current system as a positive direction, and obtaining the alternating current/direct current reactive power exchange range under different direct current step powers as follows:
when the direct current power is 2000MW, the reactive power exchange range between the converter station and the alternating current system is as follows: [ -201Mvar,450Mvar ];
when the direct current power is 4000MW, the reactive power exchange range of the converter station and the alternating current system is as follows: [ -316Mvar, 629Mvar ];
when the direct current power is 6000MW, the reactive power exchange range of the converter station and the alternating current system is as follows: [ -187Mvar, 986Mvar ];
when the direct current power is 8000MW, the reactive power exchange range of the converter station and the alternating current system is as follows: [230Mvar, 1177Mvar ].
As shown in fig. 2, the ac/dc reactive power exchange reference value optimized under different dc step powers is obtained:
when the DC power is 2000MW, QrefHas a value of 214 Mvar;
when the DC power is 4000MW, QrefHas a value of 393 Mvar;
when the direct current power is 6000MW, QrefHas a value of 750 Mvar;
when the direct current power is 8000MW, QrefThe value of (d) is 941 Mvar.
According to the method, firstly, the reactive support capability of the alternating current system under the condition of different direct current transmission powers is evaluated through the effective short circuit ratio of the direct current converter station, then the reactive exchange range of the alternating current/direct current system is determined by considering transient voltage and steady-state voltage constraints of an alternating current bus of the converter station after direct current faults, and the near-zone alternating current/direct current reactive exchange reference value under different direct current transmission powers is optimized by combining a direct current reactive control dead zone.
The method can make full use of the reactive support capability of the alternating current system according to the gradual production condition of the direct current near-region matching power supply and other reactive power compensation devices, reasonably optimizes the alternating current and direct current reactive power exchange reference value, can effectively inhibit overvoltage after direct current fault, avoids large-scale new energy off-line and equipment damage caused by overvoltage, improves the stability of the system, ensures the direct current sending capability, and realizes the optimized operation of the power grid.
An alternating current-direct current reactive power exchange reference value optimization system comprises:
the reactive support capability module: calculating the reactive support capability of the alternating current system under different step powers of direct current;
reactive power exchange extreme value module: if the reactive power supporting capability meets a preset rule, calculating the transient overvoltage and steady-state overvoltage limiting conditions of an alternating current bus of the converter station under the direct current fault, and respectively obtaining an alternating current-direct current reactive power exchange limit value constrained by the transient voltage and an alternating current-direct current reactive power exchange limit value constrained by the steady-state voltage;
an optimization module: and optimizing the AC/DC reactive power exchange reference value according to the AC/DC reactive power exchange limit value constrained by the transient voltage and the AC/DC reactive power exchange limit value constrained by the steady-state voltage.
A computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform a method for ac-dc reactive power exchange reference optimization.
A computing device comprising one or more processors, one or more memories, and one or more programs stored in the one or more memories and configured to be executed by the one or more processors, the one or more programs including instructions for performing a method for ac-dc reactive power exchange reference optimization.
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.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.

Claims (10)

1. An alternating current-direct current reactive power exchange reference value optimization method is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
calculating the reactive support capability of the alternating current system under different step powers of direct current;
if the reactive power supporting capability meets a preset rule, calculating the transient overvoltage and steady-state overvoltage limiting conditions of an alternating current bus of the converter station under the direct current fault, and respectively obtaining an alternating current-direct current reactive power exchange limit value constrained by the transient voltage and an alternating current-direct current reactive power exchange limit value constrained by the steady-state voltage;
and optimizing the AC/DC reactive power exchange reference value according to the AC/DC reactive power exchange limit value constrained by the transient voltage and the AC/DC reactive power exchange limit value constrained by the steady-state voltage.
2. The method for optimizing the AC/DC reactive power exchange reference value according to claim 1, wherein the method comprises the following steps: the preset rule is that the reactive support capacity is greater than a threshold value.
3. The method for optimizing the AC/DC reactive power exchange reference value according to claim 1 or 2, wherein the method comprises the following steps: the reactive support capability of an alternating current system under different step powers of direct current is measured by an effective short circuit ratio.
4. The method for optimizing the AC/DC reactive power exchange reference value according to claim 3, wherein the method comprises the following steps: the effective short-circuit ratio is calculated by the formula,
Figure FDA0003075108350000011
wherein, ESCRiIs the effective short circuit ratio; saciShort-circuit capacity of the direct current conversion alternating current bus; qciWhen the voltage of an alternating current bus of the converter station is a rated value, the direct current system is used for providing reactive power output of reactive power compensation equipment arranged on the converter bus; pdNiThe power is stepped by direct current.
5. The method for optimizing the AC/DC reactive power exchange reference value according to claim 1, wherein the method comprises the following steps: calculating the transient overvoltage limitation condition of the alternating current bus of the converter station under the direct current fault to obtain the alternating current-direct current reactive power exchange limit value restricted by the transient voltage,
calculating the transient overvoltage limitation condition of the alternating-current bus of the converter station under the direct-current fault, and taking the condition of the most serious transient overvoltage after the direct-current fault as a transient voltage limitation fault S1;
and limiting the transient voltage of the alternating-current bus of the converter station after the direct-current fault by taking the highest voltage-withstanding capability of equipment in the converter station as the transient critical voltage, and determining the alternating-current and direct-current reactive power exchange limit value under the constraint of the transient voltage after S1 occurs.
6. The method for optimizing the AC/DC reactive power exchange reference value according to claim 1, wherein the method comprises the following steps: calculating the steady state overvoltage limiting condition of the alternating current bus of the converter station under the direct current fault to obtain the alternating current-direct current reactive power exchange limit value restricted by the steady state voltage,
calculating the steady-state overvoltage limiting condition of the alternating-current bus of the converter station under the direct-current fault, and taking the condition of the most serious steady-state overvoltage after the direct-current fault as a steady-state voltage limiting fault S2;
and limiting the steady-state voltage of the alternating-current bus of the converter station after the direct-current fault by taking the highest voltage-withstanding capability of equipment in the converter station as the steady-state critical voltage, and determining the alternating-current and direct-current reactive power exchange limit value constrained by the steady-state voltage after S2 occurs.
7. The method for optimizing the AC/DC reactive power exchange reference value according to claim 1, wherein the method comprises the following steps: the formula for optimizing the AC/DC reactive power exchange reference value is as follows,
Qref＝max(QZ+Qex，QW-Qex)
wherein Q isrefThe optimized AC/DC reactive power exchange reference value is obtained; qZThe voltage is an alternating current-direct current reactive power exchange limit value constrained by transient voltage; qWThe voltage is an alternating current-direct current reactive power exchange limit value constrained by steady-state voltage; qexThe dead zone is the reactive power control dead zone.
8. The utility model provides an alternating current-direct current reactive power exchange reference value optimizing system which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the reactive support capability module: calculating the reactive support capability of the alternating current system under different step powers of direct current;
reactive power exchange extreme value module: if the reactive power supporting capability meets a preset rule, calculating the transient overvoltage and steady-state overvoltage limiting conditions of an alternating current bus of the converter station under the direct current fault, and respectively obtaining an alternating current-direct current reactive power exchange limit value constrained by the transient voltage and an alternating current-direct current reactive power exchange limit value constrained by the steady-state voltage;
an optimization module: and optimizing the AC/DC reactive power exchange reference value according to the AC/DC reactive power exchange limit value constrained by the transient voltage and the AC/DC reactive power exchange limit value constrained by the steady-state voltage.
9. A computer readable storage medium storing one or more programs, characterized in that: the one or more programs include instructions that, when executed by a computing device, cause the computing device to perform any of the methods of claims 1-7.
10. A computing device, comprising:
one or more processors, one or more memories, and one or more programs stored in the one or more memories and configured to be executed by the one or more processors, the one or more programs including instructions for performing any of the methods of claims 1-7.
CN202110550104.XA 2021-05-20 2021-05-20 Alternating current-direct current reactive power exchange reference value optimization method and system Withdrawn CN113300397A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110550104.XA CN113300397A (en) 2021-05-20 2021-05-20 Alternating current-direct current reactive power exchange reference value optimization method and system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110550104.XA CN113300397A (en) 2021-05-20 2021-05-20 Alternating current-direct current reactive power exchange reference value optimization method and system

Publications (1)

Publication Number Publication Date
CN113300397A true CN113300397A (en) 2021-08-24

Family

ID=77322977

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110550104.XA Withdrawn CN113300397A (en) 2021-05-20 2021-05-20 Alternating current-direct current reactive power exchange reference value optimization method and system

Country Status (1)

Country Link
CN (1) CN113300397A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113890077A (en) * 2021-08-26 2022-01-04 国家电网公司西南分部 Method for evaluating direct current bearing capacity in operation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113890077A (en) * 2021-08-26 2022-01-04 国家电网公司西南分部 Method for evaluating direct current bearing capacity in operation

Similar Documents

Publication Publication Date Title
CN107834567B (en) Reactive voltage coordination control method for extra-high voltage direct current converter station and near-field power plant
CN113381445B (en) Camera optimizing configuration method and system for restraining transient overvoltage of new energy
CN107658895B (en) Threshold value setting method for direct-current commutation failure prediction link
CN107910877B (en) Switching control method for parallel capacitor in high-power fluctuation of sending end converter station
CN110970905B (en) Multi-power-supply reactive power coordination method and system for optimizing voltage control capability of wind power plant
CN103715704A (en) Micro electrical network common bus voltage imbalance inhibition method
CN108964120B (en) Low-voltage distributed photovoltaic access capacity optimization control method
CN113300397A (en) Alternating current-direct current reactive power exchange reference value optimization method and system
CN110544953A (en) Method and system for checking steady-state voltage after extra-high voltage direct current fault
CN112653176B (en) Variable working point droop control method for multi-end flexible direct current system
CN112600219A (en) Dynamic reactive power standby optimization method for alternating current-direct current power grid
CN109885983B (en) Method for determining impedance parameters of high-impedance transformer for inhibiting short-circuit current of system
CN111435788B (en) Method and device for improving capacity of power distribution network for accommodating distributed power supply
CN114336756B (en) Camera adjustment configuration method and system of new energy island Direct Current (DC) outgoing system
CN110098618B (en) Automatic power flow adjusting method and system
CN111327058B (en) Method and device for setting dead zone of direct current reactive power control based on transient steady-state voltage constraint
CN110148968B (en) Fault recovery control method for photovoltaic direct-current grid-connected system
CN110649591B (en) Phase modulator, STATCOM and UPFC coordinated control method
CN111756051B (en) Direct-current transmission reactive compensation device, control method and system
CN113849954B (en) Power electronic transformer voltage sag tolerance capability assessment method
CN113098072B (en) Doubly-fed wind turbine voltage feedback control optimization method, doubly-fed wind turbine voltage feedback control optimization device, doubly-fed wind turbine voltage feedback control optimization equipment and storage medium
Zhu et al. Cascaded Buck-Boost converter based on energy storage unit and its control method
CN116896091B (en) Reactive power distribution method and device for multiple SVGs of new energy station
CN110649629B (en) STATCOM and UPFC coordinated control method
CN111162529B (en) Method and device for calculating alternating current bus voltage operating range of series-parallel power grid

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WW01 Invention patent application withdrawn after publication

Application publication date: 20210824

WW01 Invention patent application withdrawn after publication