CN111799803A - Filter optimization control method and device for reducing transient overvoltage and steady overvoltage - Google Patents

Filter optimization control method and device for reducing transient overvoltage and steady overvoltage Download PDF

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CN111799803A
CN111799803A CN202010458366.9A CN202010458366A CN111799803A CN 111799803 A CN111799803 A CN 111799803A CN 202010458366 A CN202010458366 A CN 202010458366A CN 111799803 A CN111799803 A CN 111799803A
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overvoltage
transient
converter station
direct current
steady
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CN111799803B (en
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张红丽
摆世彬
刘福锁
倪禛霖
郜建良
田志浩
项丽
李威
薛峰
张倩
王玉
吴雪莲
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NARI Group Corp
State Grid Ningxia Electric Power Co Ltd
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State Grid Ningxia Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • 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
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • 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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H02J2003/365—Reducing harmonics or oscillations in HVDC
    • 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
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • 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
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    • Y02E40/40—Arrangements for reducing harmonics

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Abstract

The invention discloses a filter optimization control method and a filter optimization control device for reducing transient overvoltage and steady overvoltage, which respectively calculate transient overvoltage stability margin eta of a converter station after commutation failure of a direct current power transmission system, restart of the direct current power transmission system and blocking failure of the direct current power transmission systemz1And the steady state overvoltage stability margin eta of the converter stationwAnd transient overvoltage stability margin eta of bus at new energy machine endz2(ii) a Calculating the transient overvoltage stability margin eta of the system under each faultz(ii) a And judging the direct current sending capacity limiting factor, and formulating filter control strategies under different limiting factors aiming at the direct current sending capacity limiting factor. The invention can effectively inhibit transient and steady overvoltage during direct current fault, avoid large-scale new energy off-line and equipment damage caused by overvoltage, and improveThe stability of the system is ensured, and the direct current sending capacity is ensured.

Description

Filter optimization control method and device for reducing transient overvoltage and steady overvoltage
Technical Field
The invention relates to a filter optimization control method for reducing transient and steady overvoltage, belonging to the technical field of power systems and automation thereof.
Background
With continuous operation of ultrahigh voltage direct current engineering and rapid development of new energy power generation in China, deep influence and many challenges are brought to power grid system cognition, operation control and fault defense. In addition to the conventional short-circuit fault, the high-power disturbance impact of the direct-current system, such as locking fault, commutation failure, restarting and the like, can cause transient overvoltage and steady overvoltage of the direct-current converter station and the new energy field station, so that a large number of high-voltage grid disconnection risks of the new energy unit are increased, and further the direct-current transmission power is limited.
At present, the measures for reducing transient and steady overvoltage after large direct current disturbance impact mainly include: after the direct current locking or restarting fails, the cutting speed of the filter is increased by optimizing links such as direct current control, measurement, communication and the like, and the transient voltage rise in the near area is restrained; a dynamic reactive power compensation device such as an SVC (static var compensator), a phase modulator and the like is additionally arranged in a direct-current near-area wind power plant to quickly perform automatic voltage regulation; the control protection characteristic of direct current during the phase commutation failure is improved, the falling speed of direct current is slowed down, and the transient voltage rise in a near area is restrained; the starting of a matched thermal power generating unit is increased, voltage support during stable operation recovery after failure is provided, and steady overvoltage is reduced. The research usually independently performs optimization control on transient or steady overvoltage after direct-current high-power disturbance, does not examine limiting faults, does not distinguish limiting factors of the overvoltage, and does not consider coordination of the transient or steady overvoltage in control measures.
Researches show that the numbers of groups of filters of the direct current system are different, transient overvoltage and steady overvoltage degrees of the direct current converter station and the new energy station are also different, and the purpose of reducing overvoltage can be achieved by optimizing the filter input condition during steady operation. The filter input and exit strategies are divided into an alternating current voltage control strategy and a reactive power control strategy, and the filter control strategy can automatically execute the command of inputting/cutting the alternating current filter/parallel capacitor bank according to a preset program by monitoring and controlling whether reactive exchange between the converter equipment and an alternating current system is balanced or monitoring and controlling whether the voltage of an alternating current bus reaches the target requirement. The great influence of the number of groups of the initial filter on the transient overvoltage and the steady overvoltage degree is mainly due to the fact that the influence of the direction and the magnitude of the alternating current and direct current reactive power flow on the transient voltage and the steady voltage after the direct current large disturbance impact is different, transient voltage rise caused by the fact that direct current adopts a maximum under-compensation mode after direct current faults is smaller, the transient stability of a system is higher, and the steady overvoltage level is lowest in a maximum over-compensation working mode. Namely, the influence of the direct current on the transient overvoltage and the steady overvoltage under different compensation modes is contradictory, and the compensation mode required by the direct current is determined by judging the main factor for limiting the direct current transmission capacity, so as to guide the filter control strategy, and achieve the purpose of reducing the transient overvoltage or the steady overvoltage after the direct current disturbance.
The direct current transmission system comprises a direct current line, a converter device and a converter station alternating current part, and the safe and reliable operation of the whole system can be influenced when any part fails. The filter is optimally controlled aiming at the conditions of transient overvoltage and steady overvoltage of the direct current converter station and the new energy station caused by locking, phase commutation failure, restarting and the like of any part of the direct current transmission system.
Disclosure of Invention
The purpose is as follows: in order to solve the overvoltage problem after direct current large disturbance impact, the invention provides a filter optimization control method and a filter optimization control device for reducing transient overvoltage and steady overvoltage.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a filter optimization control method for reducing transient and steady overvoltage comprises the following steps:
respectively calculating transient overvoltage stability margin eta of the converter station after commutation failure of the direct current transmission system, restart of the direct current transmission system and lockout fault of the direct current transmission systemz1And the steady state overvoltage stability margin eta of the converter stationwAnd transient overvoltage stability margin eta of bus at new energy machine endz2；
According to transient overvoltage stability margin eta of the converter station under each faultz1And the transient overvoltage stability margin eta of the bus at the new energy machine endz2And calculating the transient overvoltage stability margin eta of the system under each faultz；
According to the transient overvoltage stability margin eta of the system under each faultzAnd the steady state overvoltage stability margin eta of the converter stationwAnd judging the direct current output capacity limiting factor, and formulating filter control strategies under different limiting factors aiming at the direct current output capacity limiting factor.
Preferably, the method further comprises the following steps:
according to the transient overvoltage stability margin eta of the system under each faultzAnd the steady state overvoltage stability margin eta of the converter stationwAnd judging the fault of the limited direct current sending capacity.
Preferably, the method further comprises the following steps:
after the filter control strategy is implemented, the degree of overcompensation or under compensation is determined, the steady-state overvoltage stability margin of the converter station and the transient overvoltage stability margin of the system are recalculated, and when the two overvoltage stability margins are increased, the degree of overcompensation or under compensation is reduced until the overvoltage stability margins are reduced after large direct current disturbance.
A filter optimization control for transient and steady state overvoltage reduction, comprising the following modules:
a first overvoltage stability margin calculation module: is used for respectively calculating transient overvoltage stability margin eta of the converter station after commutation failure of the direct current transmission system, restart of the direct current transmission system and lockout fault of the direct current transmission systemz1And the steady state overvoltage stability margin eta of the converter stationwAnd transient overvoltage stability margin eta of bus at new energy machine endz2；
A second overvoltage stability margin calculation module: for stabilizing the transient overvoltage margin eta of the converter station according to the faultsz1And the transient overvoltage stability margin eta of the bus at the new energy machine endz2And calculating the transient overvoltage stability margin eta of the system under each faultz；
A filter control module: for stabilizing margin eta of transient overvoltage of system according to each faultzAnd the steady state overvoltage stability margin eta of the converter stationwAnd judging the direct current output capacity limiting factor, and formulating filter control strategies under different limiting factors aiming at the direct current output capacity limiting factor.
Preferably, the system also comprises the following modules:
a limited fault judgment module: for stabilizing margin eta of transient overvoltage of system according to each faultzAnd the steady state overvoltage stability margin eta of the converter stationwAnd judging the fault of the limited direct current sending capacity.
Preferably, the system also comprises the following modules:
a filter adjusting module: after the method is used for implementing a filter control strategy, the over-compensation degree or the under-compensation degree is determined, the steady-state overvoltage stability margin of the converter station and the transient overvoltage stability margin of the system are recalculated, and when the two overvoltage stability margins are increased, the over-compensation degree or the under-compensation degree is reduced until the overvoltage stability margins are reduced after large direct current disturbance.
Preferably, the transient overvoltage stability margin η of the converter stationz1The calculation formula is as follows:
Figure BDA0002508503260000031
wherein the content of the first and second substances,
Figure BDA0002508503260000032
for examined transient voltage weight coefficient, U, of converter stationz1For the converter station transient state maximum voltage, U of examinationz1,limAnd checking transient critical voltage of the converter station.
Preferably, the transient overvoltage stability margin eta of the bus at the end of the new energy machinez2The calculation formula is as follows:
Figure BDA0002508503260000041
wherein the content of the first and second substances,
Figure BDA0002508503260000042
is the bus transient voltage weight coefficient of the new energy machine end, n is the number of the examined new energy,
Figure BDA0002508503260000043
for the examined bus transient state maximum voltage, U, of the new energy machine endz2,lim iThe transient state critical voltage of the bus at the end of the new energy machine is examined.
As a preferred scheme, the steady state overvoltage stability margin η of the converter stationwThe calculation formula is as follows:
Figure BDA0002508503260000044
wherein, UwFor checking the steady-state voltage, U, of the converter station0Converter station for examinationInitial voltage, Uw,limConverter station steady state critical voltage, delta U, for assessmentw,limAssessed converter station steady state critical pressure rise, beta1For assessing the steady-state overvoltage weight coefficient, beta, of the converter station2And obtaining the steady-state pressure rise weight coefficient of the examined converter station.
Preferably, beta is determined when only steady-state overvoltages are present in the converter station1＝1、β2＝0；
Beta when the converter station only has a steady state pressure rise exceeding the steady state critical pressure rise1＝0、β2＝1；
Beta when the converter station has both a steady-state overvoltage and a steady-state voltage rise exceeding a steady-state critical voltage1＝β2＝0.5。
Preferably, the transient overvoltage stability margin eta of the systemzThe calculation formula is as follows:
ηz＝ηz1+ηz2。
as a preferred scheme, judging the limited factor of the direct current sending capacity, and making filter control strategies under different limited factors aiming at the limited factor of the direct current sending capacity, wherein the steps are as follows:
when etaz< 0 and ηwWhen the current is less than 0, the direct current is not limited by voltage stability under large disturbance impact, and the filter control strategy maintains the existing strategy unchanged;
when etazNot less than 0 or etawWhen the voltage is more than or equal to 0, the transient overvoltage or the steady overvoltage problem exists under the large direct current disturbance impact. Wherein: when etaz＞ηwThe direct current sending capacity limiting factor is transient overvoltage constraint limitation under direct current large disturbance, and a filter needs to operate in a maximum under-compensation mode and adopts converter station alternating voltage control;
when etaz＜ηwThe direct current sending capacity limiting factor is steady-state overvoltage constraint limitation under direct current large disturbance, and a filter needs to operate in a maximum over-compensation mode and adopts converter station alternating current voltage control;
when etaz＝ηwThe limiting factor of the DC output capacity is transient overvoltage under large DC disturbanceAnd (4) steady-state overvoltage constraint limitation, wherein in order to reduce the risk of new energy offline, a filter needs to operate in a maximum under-compensation mode and adopt converter station alternating voltage control.
As an optimal scheme, the fault that the direct current sending capacity is limited is judged, and the steps are as follows:
selecting the steady-state overvoltage stability margin eta of the converter station under three faults of failed commutation of the direct-current transmission system, restarting of the direct-current transmission system and locking of the direct-current transmission systemwTransient overvoltage stability margin eta of systemzThe fault corresponding to the maximum value is the fault with limited direct current sending capacity.
Has the advantages that: according to the filter optimization control method and device for reducing transient overvoltage and steady overvoltage, the limited factors for limiting the conveying capacity of the direct current sending end are determined according to the transient overvoltage stability margin and the steady overvoltage stability margin of the bus of the new energy machine end and the converter station after direct current disturbance, and filter control strategies under different limited factors are formulated according to the limited factors.
In addition, the limited fault for limiting the transmission capacity of the direct current sending end is determined according to the transient state and steady state overvoltage stability margin of the bus at the end of the new energy source machine and the converter station after the direct current disturbance, and when the limited factor is transient overvoltage, the maximum under-compensation mode is adopted in the static state of the direct current to reduce the input group number of the filter by combining the influence degree of reactive exchange between the direct current and the system on the transient state and steady state overvoltage; when the limited factor is steady overvoltage, the maximum overcompensation mode is adopted in the direct current static state, the input group number of the filter is increased, and the filter is uniformly controlled by constant alternating current voltage in the transient process. The invention can effectively inhibit transient and steady overvoltage when direct current fault occurs, avoid large-scale new energy off-line and equipment damage caused by overvoltage, improve the stability of the system and ensure the sending capability of direct current.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, a filter optimization control method for reducing transient and steady overvoltage is applied to an ac/dc power transmission system constructed by a converter station and a new energy machine, and includes the following steps:
step 1: respectively calculating transient overvoltage stability margin eta of the converter station after commutation failure of the direct current transmission system, restart of the direct current transmission system and lockout fault of the direct current transmission systemz1And the steady state overvoltage stability margin eta of the converter stationwAnd transient overvoltage stability margin eta of bus at new energy machine endz2；
Step 2: according to transient overvoltage stability margin eta of the converter station under each faultz1And the transient overvoltage stability margin eta of the bus at the new energy machine endz2And calculating the transient overvoltage stability margin eta of the system under each faultz；
And step 3: according to the transient overvoltage stability margin eta of the system under each faultzAnd the steady state overvoltage stability margin eta of the converter stationwJudging the direct current sending capacity limiting factors under each fault, and formulating filter control strategies under different limiting factors aiming at the direct current sending capacity limiting factors;
and 4, step 4: according to the transient overvoltage stability margin eta of the system under each faultzAnd the steady state overvoltage stability margin eta of the converter stationwJudging the fault that the direct current sending capacity is limited;
and 5: after the filter control strategy is implemented, the degree of overcompensation or under compensation is determined, the steady-state overvoltage stability margin of the converter station and the transient overvoltage stability margin of the system are recalculated, and when the two overvoltage stability margins are increased, the degree of overcompensation or under compensation is reduced until the overvoltage stability margins are reduced after large direct current disturbance.
Preferably, the transient overvoltage and steady overvoltage values are obtained by reading voltage tracks of the converter station and the new energy source machine after the direct current large disturbance, and the reading condition is suitable for the conditions that the voltage track does not oscillate, diverge and destabilize after the direct current large disturbance.
Preferably, after the direct current transmission system fails in commutation, is restarted and is in locking fault, transient state maximum voltage and steady state voltage of the converter station and the new energy machine end are calculated through time domain simulation, generally speaking, the transient state maximum voltage generally appears at the time of starting fault or removing fault, and the steady state voltage generally takes a value after 10s after the starting fault.
Preferably, the transient overvoltage stability margin η of the converter stationz1Calculating the formula:
Figure BDA0002508503260000061
wherein the content of the first and second substances,
Figure BDA0002508503260000071
for examined transient voltage weight coefficient, U, of converter stationz1For the converter station transient state maximum voltage, U of examinationz1,limAnd (3) checking the transient critical voltage of the converter station, wherein the transient critical voltage of the converter station is generally the highest voltage endurance capability of the equipment and is 1.3 times of the operating voltage.
Preferably, the transient overvoltage stability margin eta of the bus at the end of the new energy machinez2Calculating the formula:
Figure BDA0002508503260000072
wherein the content of the first and second substances,
Figure BDA0002508503260000073
is the bus transient voltage weight coefficient of the new energy machine end, n is the number of the examined new energy,
Figure BDA0002508503260000074
for the examined bus transient state maximum voltage, U, of the new energy machine endz2,lim iThe transient state critical voltage of the bus at the new energy machine end is examined, wherein the transient state critical voltage of the bus at the new energy machine end is subject to different regions, and the voltage endurance capacity of different types of new energy is different and generally 1.15 times, 1.2 times and 1.3 times of the rated voltage.
Preferably, the steady-state overvoltage stability margin η of the converter stationwCalculating the formula:
Figure BDA0002508503260000075
wherein, UwFor checking the steady-state voltage, U, of the converter station0For an assessed converter station initial voltage, Uw,limConverter station steady state critical voltage, delta U, for assessmentw,limAssessed converter station steady state critical pressure rise, beta1For assessing the steady-state overvoltage weight coefficient, beta, of the converter station2The steady state pressure rise weight coefficient of the converter station is evaluated; the steady-state critical voltage of the converter station is generally 1.1 times of the rated voltage, the steady-state critical voltage rise is different due to different voltage levels of the converter buses, generally 750kV buses have the steady-state critical voltage rise of 40kV, and 330kV buses have the steady-state critical voltage rise of 15-18 kV.
Beta when only steady-state overvoltage is present in the converter station1＝1、β2＝0；
Beta when the converter station only has a steady state pressure rise exceeding the steady state critical pressure rise1＝0、β2＝1；
Beta when the converter station has both a steady-state overvoltage and a steady-state voltage rise exceeding a steady-state critical voltage1＝β2＝0.5。
Preferably, the system transient overvoltage stability margin ηzCalculating the formula:
ηz＝ηz1+ηz2
preferably, the method for judging the fault of the limited direct current sending capacity comprises the following steps:
selecting the steady-state overvoltage stability margin eta of the converter station under three faults of failed commutation of the direct-current transmission system, restarting of the direct-current transmission system and locking of the direct-current transmission systemwTransient overvoltage stability margin eta of systemzThe fault corresponding to the maximum value is the fault with limited direct current sending capacity.
Preferably, the method comprises the steps of judging the limited factor of the direct current sending capacity, and making filter control strategies under different limited factors aiming at the limited factor of the direct current sending capacity, wherein the steps are as follows:
when etaz< 0 and ηwWhen the current is less than 0, the direct current is not limited by voltage stability under large disturbance impact, and the filter control strategy maintains the existing strategy unchanged;
when etazNot less than 0 or etawWhen the voltage is more than or equal to 0, the transient overvoltage or the steady overvoltage problem exists under the large direct current disturbance impact. Wherein: when etaz＞ηwThe direct current sending capacity limiting factor is transient overvoltage constraint limitation under direct current large disturbance, and a filter needs to operate in a maximum under-compensation mode and adopts converter station alternating voltage control;
when etaz＜ηwThe direct current sending capacity limiting factor is steady-state overvoltage constraint limitation under direct current large disturbance, and a filter needs to operate in a maximum over-compensation mode and adopts converter station alternating current voltage control;
when etaz＝ηwThe direct current sending capacity limiting factors are transient overvoltage and steady overvoltage constraint limitation under direct current large disturbance, and in order to reduce the new energy grid disconnection risk, a filter needs to operate in a maximum under-compensation mode and adopt converter station alternating current voltage control.
Preferably, after the filter adjusts the compensation mode, the adaptability is verified through time domain simulation to determine the degree of over-compensation or under-compensation. After the strategy of the filter is modified, the overvoltage stability margins of the direct current commutation failure, the restart and the converter station and the new energy machine end bus are calculated in a simulation mode, and when the overvoltage stability margins are increased, the overcompensation degree or the undercompensation degree needs to be reduced until the overvoltage stability margins are reduced after all direct current large disturbances occur.
According to the method, after direct-current large disturbance impact is carried out according to the alternating-current and direct-current reactive power flowing direction and the alternating-current and direct-current reactive power flowing direction, the transient voltage and the steady-state voltage are different in influence, filter control strategies under different limited factors are formulated by judging voltage limited factors after the direct-current large disturbance impact, transient overvoltage or steady-state overvoltage degree after direct-current fault can be reduced, the new energy grid disconnection amount is reduced, and it is guaranteed that equipment such as a converter station is not damaged due to temporary or long-term overvoltage.
A filter optimization control for transient and steady state overvoltage reduction, comprising the following modules:
a first overvoltage stability margin calculation module: is used for respectively calculating transient overvoltage stability margin eta of the converter station after commutation failure of the direct current transmission system, restart of the direct current transmission system and lockout fault of the direct current transmission systemz1And the steady state overvoltage stability margin eta of the converter stationwAnd transient overvoltage stability margin eta of bus at new energy machine endz2；
A second overvoltage stability margin calculation module: for stabilizing the transient overvoltage margin eta of the converter station according to the faultsz1And the transient overvoltage stability margin eta of the bus at the new energy machine endz2And calculating the transient overvoltage stability margin eta of the system under each faultz；
A filter control module: for stabilizing margin eta of transient overvoltage of system according to each faultzAnd the steady state overvoltage stability margin eta of the converter stationwAnd judging the direct current output capacity limiting factor, and formulating filter control strategies under different limiting factors aiming at the direct current output capacity limiting factor.
A limited fault judgment module: for stabilizing margin eta of transient overvoltage of system according to each faultzAnd the steady state overvoltage stability margin eta of the converter stationwAnd judging the fault of the limited direct current sending capacity.
A filter adjusting module: after the method is used for implementing a filter control strategy, the over-compensation degree or the under-compensation degree is determined, the steady-state overvoltage stability margin of the converter station and the transient overvoltage stability margin of the system are recalculated, and when the two overvoltage stability margins are increased, the over-compensation degree or the under-compensation degree is reduced until the overvoltage stability margins are reduced after large direct current disturbance.
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.

Claims (20)

1. A filter optimization control method for reducing transient and steady overvoltage is characterized in that: the method comprises the following steps:
respectively calculating transient overvoltage stability margin eta of the converter station after commutation failure of the direct current transmission system, restart of the direct current transmission system and lockout fault of the direct current transmission systemz1And the steady state overvoltage stability margin eta of the converter stationwAnd bus transient overvoltage at new energy machine endMargin of stability etaz2；
According to transient overvoltage stability margin eta of the converter station under each faultz1And the transient overvoltage stability margin eta of the bus at the new energy machine endz2And calculating the transient overvoltage stability margin eta of the system under each faultz；
According to the transient overvoltage stability margin eta of the system under each faultzAnd the steady state overvoltage stability margin eta of the converter stationwAnd judging the direct current sending capacity limiting factor, and formulating filter control strategies under different limiting factors aiming at the direct current sending capacity limiting factor.
2. The method of claim 1, wherein the filter is optimized to reduce transient and steady state overvoltages by: also comprises the following steps:
according to the transient overvoltage stability margin eta of the system under each faultzAnd the steady state overvoltage stability margin eta of the converter stationwAnd judging the fault that the direct current sending capacity is limited.
3. The method of claim 1, wherein the filter is optimized to reduce transient and steady state overvoltages by: also comprises the following steps:
and determining the over-compensation degree or the under-compensation degree, recalculating the steady-state overvoltage stability margin and the system transient overvoltage stability margin of the converter station, and reducing the over-compensation degree or the under-compensation degree when the two overvoltage stability margins are increased until the overvoltage stability margins are reduced after the direct current large disturbance.
4. A filter optimization control method for reducing transient and steady state overvoltages according to any one of claims 1 to 3, characterized by: the transient overvoltage stability margin eta of the converter stationz1The calculation formula is as follows:
Figure FDA0002508503250000011
wherein the content of the first and second substances,
Figure FDA0002508503250000012
for examined transient voltage weight coefficient, U, of converter stationz1For the converter station transient state maximum voltage, U of examinationz1,limAnd checking transient critical voltage of the converter station.
5. A filter optimization control method for reducing transient and steady state overvoltages according to any one of claims 4, wherein: the transient overvoltage stability margin eta of the bus at the new energy machine endz2The calculation formula is as follows:
Figure FDA0002508503250000021
wherein the content of the first and second substances,
Figure FDA0002508503250000022
is the bus transient voltage weight coefficient of the new energy machine end, n is the number of the examined new energy,
Figure FDA0002508503250000023
for the examined bus transient state maximum voltage, U, of the new energy machine endz2,lim iThe transient state critical voltage of the bus at the end of the new energy machine is examined.
6. A filter optimization control method for reducing transient and steady state overvoltages as claimed in any one of claims 5, wherein: the steady-state overvoltage stability margin eta of the converter stationwThe calculation formula is as follows:
Figure FDA0002508503250000024
wherein, UwFor checking the steady-state voltage, U, of the converter station0For an assessed converter station initial voltage, Uw,limConverter station steady state critical voltage, delta U, for assessmentw,limAssessed converter station steady state critical pressure rise, beta1To be examinedNuclear converter station steady state overvoltage weight coefficient, beta2And obtaining the steady-state pressure rise weight coefficient of the examined converter station.
7. The method of claim 6, wherein the filter is optimized to reduce transient and steady state overvoltages by: beta when only steady-state overvoltage is present in the converter station1＝1、β2＝0；
Beta when the converter station only has a steady state pressure rise exceeding the steady state critical pressure rise1＝0、β2＝1；
Beta when the converter station has both a steady-state overvoltage and a steady-state voltage rise exceeding a steady-state critical voltage1＝β2＝0.5。
8. A filter optimization control method for reducing transient and steady state overvoltages as claimed in any one of claims 6, wherein: the transient overvoltage stability margin eta of the systemzThe calculation formula is as follows:
ηz＝ηz1+ηz2。
9. the method of claim 8, wherein the filter is optimized to reduce transient and steady state overvoltages by: judging the direct current sending capacity limiting factor, and formulating filter control strategies under different limiting factors aiming at the direct current sending capacity limiting factor, wherein the steps are as follows:
when etaz< 0 and ηwWhen the current is less than 0, the direct current is not limited by voltage stability under large disturbance impact, and the filter control strategy maintains the existing strategy unchanged;
when etazNot less than 0 or etawWhen the voltage is more than or equal to 0, the transient overvoltage or the steady overvoltage problem exists under the large direct current disturbance impact. Wherein: when etaz＞ηwThe direct current sending capacity limiting factor is transient overvoltage constraint limitation under direct current large disturbance, and a filter needs to operate in a maximum under-compensation mode and adopts converter station alternating voltage control;
when etaz＜ηwThe DC output capability is affectedThe limiting factor is steady-state overvoltage constraint limitation under large direct current disturbance, and a filter needs to operate in a maximum overcompensation mode and adopts converter station alternating current voltage control;
when etaz＝ηwThe direct current sending capacity limiting factors are transient overvoltage and steady overvoltage constraint limitation under direct current large disturbance, and in order to reduce the new energy grid disconnection risk, a filter needs to operate in a maximum under-compensation mode and adopt converter station alternating current voltage control.
10. The method of claim 8, wherein the filter is optimized to reduce transient and steady state overvoltages by: judging the fault of the limited direct current sending capacity, comprising the following steps:
selecting the steady-state overvoltage stability margin eta of the converter station under three faults of failed commutation of the direct-current transmission system, restarting of the direct-current transmission system and locking of the direct-current transmission systemwTransient overvoltage stability margin eta of systemzThe fault corresponding to the maximum value is the fault with limited direct current sending capacity.
11. A filter optimization control for transient and steady state overvoltage reduction, comprising the following modules:
a first overvoltage stability margin calculation module: is used for respectively calculating transient overvoltage stability margin eta of the converter station after commutation failure of the direct current transmission system, restart of the direct current transmission system and lockout fault of the direct current transmission systemz1And the steady state overvoltage stability margin eta of the converter stationwAnd transient overvoltage stability margin eta of bus at new energy machine endz2；
A second overvoltage stability margin calculation module: for stabilizing the transient overvoltage margin eta of the converter station according to the faultsz1And the transient overvoltage stability margin eta of the bus at the new energy machine endz2And calculating the transient overvoltage stability margin eta of the system under each faultz；
A filter control module: for stabilizing margin eta of transient overvoltage of system according to each faultzAnd the steady state overvoltage stability margin eta of the converter stationwAnd judging the direct current sending capacity limiting factor, and formulating filter control strategies under different limiting factors aiming at the direct current sending capacity limiting factor.
12. A filter optimization control for reducing transient and steady state overvoltages as set forth in claim 11, wherein: the system also comprises the following modules:
a limited fault judgment module: for stabilizing margin eta of transient overvoltage of system according to each faultzAnd the steady state overvoltage stability margin eta of the converter stationwAnd judging the fault that the direct current sending capacity is limited.
13. A filter optimization control for reducing transient and steady state overvoltages as set forth in claim 11, wherein: the system also comprises the following modules:
a filter adjusting module: and the method is used for determining the over-compensation degree or the under-compensation degree, recalculating the steady-state overvoltage stability margin and the system transient overvoltage stability margin of the converter station, and reducing the over-compensation degree or the under-compensation degree when the two overvoltage stability margins are increased until the overvoltage stability margins are reduced after the direct current large disturbance.
14. A filter optimization control for reducing transient and steady state overvoltages as set forth in any one of claims 11-13 wherein: the transient overvoltage stability margin eta of the converter stationz1The calculation formula is as follows:
Figure FDA0002508503250000041
wherein the content of the first and second substances,
Figure FDA0002508503250000042
for examined transient voltage weight coefficient, U, of converter stationz1For the converter station transient state maximum voltage, U of examinationz1,limAnd checking transient critical voltage of the converter station.
15. A filter optimization control for reducing transient and steady state overvoltages as set forth in claim 14, wherein: the transient overvoltage stability margin eta of the bus at the new energy machine endz2The calculation formula is as follows:
Figure FDA0002508503250000043
wherein the content of the first and second substances,
Figure FDA0002508503250000044
is the bus transient voltage weight coefficient of the new energy machine end, n is the number of the examined new energy,
Figure FDA0002508503250000045
for the examined bus transient state maximum voltage, U, of the new energy machine endz2,lim iThe transient state critical voltage of the bus at the end of the new energy machine is examined.
16. A filter optimization control for reducing transient and steady state overvoltages as set forth in claim 15, wherein: the steady-state overvoltage stability margin eta of the converter stationwThe calculation formula is as follows:
Figure FDA0002508503250000051
wherein, UwFor checking the steady-state voltage, U, of the converter station0For an assessed converter station initial voltage, Uw,limConverter station steady state critical voltage, delta U, for assessmentw,limAssessed converter station steady state critical pressure rise, beta1For assessing the steady-state overvoltage weight coefficient, beta, of the converter station2And obtaining the steady-state pressure rise weight coefficient of the examined converter station.
17. A filter optimization control for reducing transient and steady state overvoltages as set forth in claim 16, wherein: beta when only steady-state overvoltage is present in the converter station1＝1、β2＝0；
Beta when the converter station only has a steady state pressure rise exceeding the steady state critical pressure rise1＝0、β2＝1；
Beta when the converter station has both a steady-state overvoltage and a steady-state voltage rise exceeding a steady-state critical voltage1＝β2＝0.5。
18. A filter optimization control for reducing transient and steady state overvoltages as set forth in claim 15, wherein: the transient overvoltage stability margin eta of the systemzThe calculation formula is as follows:
ηz＝ηz1+ηz2。
19. a filter optimization control for reducing transient and steady state overvoltages as set forth in claim 18, wherein: judging the direct current sending capacity limiting factor, and formulating filter control strategies under different limiting factors aiming at the direct current sending capacity limiting factor, wherein the steps are as follows:
when etaz< 0 and ηwWhen the current is less than 0, the direct current is not limited by voltage stability under large disturbance impact, and the filter control strategy maintains the existing strategy unchanged;
when etazNot less than 0 or etawWhen the voltage is more than or equal to 0, the transient overvoltage or the steady overvoltage problem exists under the large direct current disturbance impact. Wherein: when etaz＞ηwThe direct current sending capacity limiting factor is transient overvoltage constraint limitation under direct current large disturbance, and a filter needs to operate in a maximum under-compensation mode and adopts converter station alternating voltage control;
when etaz＜ηwThe direct current sending capacity limiting factor is steady-state overvoltage constraint limitation under direct current large disturbance, and a filter needs to operate in a maximum over-compensation mode and adopts converter station alternating current voltage control;
when etaz＝ηwThe limiting factor of the direct current sending capacity is transient overvoltage and steady overvoltage constraint limitation under direct current large disturbance, and in order to reduce the risk of new energy off-grid, the filter needs to operateAnd controlling the AC voltage of the converter station in a maximum under-compensation mode.
20. A filter optimization control for reducing transient and steady state overvoltages as set forth in claim 18, wherein: judging the fault of the limited direct current sending capacity, comprising the following steps:
selecting the steady-state overvoltage stability margin eta of the converter station under three faults of failed commutation of the direct-current transmission system, restarting of the direct-current transmission system and locking of the direct-current transmission systemwTransient overvoltage stability margin eta of systemzThe fault corresponding to the maximum value is the fault with limited direct current sending capacity.
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CN110649630A (en) * 2019-09-11 2020-01-03 国网电力科学研究院有限公司 Phase modulator for inhibiting continuous commutation failure and SVC (static var compensator) coordinated control method and system

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CN110601245A (en) * 2019-08-12 2019-12-20 国家电网有限公司 Method and system for checking transient overvoltage after extra-high voltage direct current fault
CN110649630A (en) * 2019-09-11 2020-01-03 国网电力科学研究院有限公司 Phase modulator for inhibiting continuous commutation failure and SVC (static var compensator) coordinated control method and system

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