CN111769569B - Control method, device and system for phase modulator of extra-high voltage direct current transmitting end converter station - Google Patents

Control method, device and system for phase modulator of extra-high voltage direct current transmitting end converter station Download PDF

Info

Publication number
CN111769569B
CN111769569B CN202010453575.4A CN202010453575A CN111769569B CN 111769569 B CN111769569 B CN 111769569B CN 202010453575 A CN202010453575 A CN 202010453575A CN 111769569 B CN111769569 B CN 111769569B
Authority
CN
China
Prior art keywords
direct current
phase modulator
reactive power
converter station
control system
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.)
Active
Application number
CN202010453575.4A
Other languages
Chinese (zh)
Other versions
CN111769569A (en
Inventor
王超
常海军
刘福锁
李威
方保民
董凌
李宏强
孙仲卿
黄畅想
孙震宇
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.)
State Grid Corp of China SGCC
Nari Technology Co Ltd
State Grid Qinghai Electric Power Co Ltd
Electric Power Research Institute of State Grid Ningxia Electric Power Co Ltd
State Grid Electric Power Research Institute
Original Assignee
State Grid Corp of China SGCC
Nari Technology Co Ltd
State Grid Qinghai Electric Power Co Ltd
Electric Power Research Institute of State Grid Ningxia Electric Power 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 State Grid Corp of China SGCC, Nari Technology Co Ltd, State Grid Qinghai Electric Power Co Ltd, Electric Power Research Institute of State Grid Ningxia Electric Power Co Ltd, State Grid Electric Power Research Institute filed Critical State Grid Corp of China SGCC
Priority to CN202010453575.4A priority Critical patent/CN111769569B/en
Publication of CN111769569A publication Critical patent/CN111769569A/en
Application granted granted Critical
Publication of CN111769569B publication Critical patent/CN111769569B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1885—Arrangements for adjusting, eliminating or compensating reactive power in networks using rotating means, e.g. synchronous generators
    • 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]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

The invention discloses a method, a device and a system for controlling a phase modulator of an extra-high voltage direct current transmitting end converter station, which comprise the following steps: in response to receiving a direct current normal operation signal sent by a direct current safety control system, sending a phase modulator reactive power control mode instruction and a reactive power reference value instruction to a phase modulator group, setting the phase modulator group to work in a reactive power control mode, and setting the reactive power of each phase modulator as each reactive power reference value; and in response to receiving a direct current blocking signal or a direct current low-power operation signal sent by the direct current safety control system, sending a voltage control mode instruction and a voltage reference value instruction to the phase modulator group, so that the phase modulator group operates in a voltage control mode. The invention solves the contradiction of the direct current system compensation mode to the problem of different overvoltage of the converter station after the direct current fault is restrained, and improves the economical efficiency of the phase modifier operation while improving the stability of the bus voltage of the converter station at the direct current sending end.

Description

Control method, device and system for phase modulator of extra-high voltage direct current transmitting end converter station
Technical Field
The invention relates to a method, a device and a system for controlling a phase modulator of an extra-high voltage direct current transmitting end converter station, and belongs to the technical field of power system automation.
Background
In order to meet the requirements of sending out new energy electric power such as wind and light in the three north area of China, a multi-loop ultrahigh voltage direct current transmission project is put into operation in the power grid in the northwest China and other areas. In order to improve the short-circuit capacity and the direct-current transmission capacity of a bus of the sending end converter station, a part of the extra-high voltage direct-current sending end converter station is provided with a synchronous phase modulator.
The voltage stability problem of the ultrahigh voltage direct current (especially taking new energy as a matched power supply) high-power disturbance rear-end converter station mainly comprises two types: the transient overvoltage after the direct current commutation failure is the first, and the steady overvoltage after the current returns due to the direct current power locking is the second. In actual operation, the direct-current control protection system performs reactive compensation capacitor switching according to the reactive exchange size of the alternating-current and direct-current system, and the reactive exchange quantity of the alternating-current and direct-current system is guaranteed to be in a reasonable range. Under the same working condition, when the direct current system operates in an under-compensation mode (the alternating current system provides reactive power for the direct current system), the steady-state overvoltage problem of the bus of the converter station after the direct current blocking fault is more serious; when the direct current system operates in an overcompensation mode (the direct current system provides reactive power for the alternating current system), the transient overvoltage problem of the converter station is more serious after direct current commutation fails. From the above characteristics, considering the problem of transient overvoltage under the condition of suppressing the dc commutation failure and the problem of steady-state overvoltage after the dc blocking failure, the requirements of the dc system in the manners of reactive overvoltage and under-compensation are contradictory, and the requirements of both cannot be met.
The synchronous phase modulator is a rotating device, a stator winding flux linkage cannot be suddenly changed, and the synchronous phase modulator has a spontaneous response capability on transient voltage fluctuation in a direct-current commutation failure process. The phase modulator excitation control system generally adopts a reactive power and voltage double closed-loop control structure, and can adopt different control modes according to different control targets. The control mode of a phase modulator configured in an extra-high voltage direct current converter station of an existing transmission end power grid is mainly a voltage control mode, dynamic reactive power support capability is reserved as far as possible, and participation in steady-state reactive power balance of the power grid is generally not considered, so that the running economy of the phase modulator is poor. With the increase of the scale of new energy sources matched with direct current, the overvoltage problem after direct current fault is more serious, and the requirement for fully utilizing the reactive power regulation capability of the phase modulator is continuously improved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method, a device and a system for controlling a phase modulator of an extra-high voltage direct current sending end converter station, and solves the problem of contradiction of a direct current system compensation mode to the problem of different overvoltage of the converter station after the direct current fault is restrained.
In order to achieve the above purpose, the invention adopts the following technical scheme: a control method for a phase modulator of an extra-high voltage direct current sending end converter station comprises the following steps:
in response to receiving a direct current normal operation signal sent by a direct current safety control system, sending a phase modulator reactive power control mode instruction and a reactive power reference value instruction to a phase modulator group, setting the phase modulator group to work in a reactive power control mode, and setting the reactive power of each phase modulator as each reactive power reference value;
and in response to receiving a direct current blocking signal or a direct current low-power operation signal sent by the direct current safety control system, sending a voltage control mode instruction and a voltage reference value instruction to the phase modulator group, so that the phase modulator group operates in a voltage control mode.
Further, the direct-current safety control system judges whether the current steady-state running power of the direct current is larger than the maximum threshold value of the direct-current running power, and if not, the direct-current safety control system sends a direct-current low-power running signal to the phase modulator control substation;
if the direct current is greater than the preset value, the direct current safety control system judges whether the direct current has the lockout fault, if the lockout fault occurs, the direct current safety control system sends a direct current lockout signal to the phase modulator control substation, and otherwise, the direct current safety control system sends a direct current normal operation signal to the phase modulator control substation.
Further, the method for obtaining the maximum threshold value of the direct current operating power comprises the following steps:
obtaining the direct current running power P through electromechanical transient simulation analysisdcWhen the expected DC fault occurs, the maximum transient state voltage of the AC bus of the converter station is increased to
Figure BDA0002508504390000021
Wherein the content of the first and second substances,
Figure BDA0002508504390000022
transient voltage rise of an alternating current bus of the converter station after the ith expected direct current fault occurs;
if it is
Figure BDA0002508504390000023
ΔVHmaxFor transient voltage rise limit of AC bus of converter station, the step length is delta PdcIncreasing the DC operating power Pdc＝Pdc+ΔPdcContinuously calculating the DC operating power as PdcAC of converter station after expected DC fault happensThe maximum transient state voltage rise of the bus is determined, otherwise, the maximum threshold value of the direct current running power constrained by the transient state voltage rise of the converter station after the expected direct current fault is determined to be P0＝Pdc-ΔPdc。
A kind of extra-high voltage direct current sends the phase modulation controlling device of the end converter station, comprising:
the reactive power control mode setting module is used for responding to a received direct current normal operation signal sent by the direct current safety control system, sending a phase modifier reactive power control mode instruction and a reactive power reference value instruction to a phase modifier group, setting the phase modifier group to work in a reactive power control mode, and setting the reactive power of each phase modifier as each reactive power reference value;
and the voltage control mode setting module is used for responding to a received direct current blocking signal or a direct current low-power operation signal sent by the direct current safety control system and sending a voltage control mode instruction and a voltage reference value instruction to the phase modulator group so as to enable the phase modulator group to operate in a voltage control mode.
Further, the direct-current safety control system judges whether the current steady-state running power of the direct current is larger than the maximum threshold value of the direct-current running power, and if not, the direct-current safety control system sends a direct-current low-power running signal to the phase modulator control substation;
if the direct current is greater than the preset value, the direct current safety control system judges whether the direct current has the lockout fault, if the lockout fault occurs, the direct current safety control system sends a direct current lockout signal to the phase modulator control substation, and otherwise, the direct current safety control system sends a direct current normal operation signal to the phase modulator control substation.
An extra-high voltage direct current sending end converter station phase modulator control system comprises: the phase modifier control substation and the direct current safety control system;
the phase modulator control substation is used for receiving the operation information of each phase modulator and receiving a direct current operation state signal of the direct current safety control system; the system is used for sending the operation information of the phase modulators to the direct current safety control system and sending the command information of the phase modulators to each phase modulator;
the direct current safety control system is used for emergency control after direct current faults and is used for receiving information of the phase modulator substation, wherein the information comprises a reactive power value of a phase modulator group; the phase modifier control substation is used for sending a direct current running state signal to the phase modifier control substation, and comprises a power instruction and a running mode instruction.
And the direct current safety control system is used for receiving the operation information of the phase modifier sent by the phase modifier control substation and sending a direct current operation state signal to the phase modifier control substation.
Further, the operation information of the phase modulation machine includes: the method comprises the steps of running and stopping information of the phase modulator, whether the phase modulator is in a defervescence period after forced excitation or not, the working mode of an excitation control system of the phase modulator, and the real-time running voltage and the reactive power of the phase modulator.
Further, the phase modulation command information includes: the phase modulation machine comprises a phase modulation machine working mode switching instruction, a working mode instruction, a reactive power reference instruction and a voltage reference instruction.
Further, the dc operating status signal includes a dc normal operating signal and a dc blocking signal.
Further, the operation information of the phase modulation machine control substation comprises: the operation and shutdown information of the phase modulator group, whether each phase modulator is in the defervescence period after forced excitation, the working mode of the phase modulator excitation control system, and the real-time operation voltage and the reactive power of the phase modulator.
The invention has the beneficial effects that: when the direct current is in steady-state operation, the phase modulator is set to operate in a reactive power control mode, the steady-state reactive support capability of the phase modulator is utilized to replace part of reactive compensation capacitors of a direct current system, the direct current system is ensured to be in an under-compensation state, and the transient overvoltage of a bus of a converter station after the direct current commutation failure is inhibited; after the direct current is locked to have a fault, the phase modulator is triggered to be converted into a voltage control mode based on a fault event, the phase-delay operation state is switched into a phase-feed operation state, and the stable overvoltage of a bus of the converter station can be effectively inhibited. The phase modifier operation economical efficiency is improved while the stability of the bus voltage of the direct current sending end converter station is improved.
Drawings
FIG. 1 is a block diagram of a control system according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method according to an embodiment of the present invention.
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.
Example 1:
as shown in fig. 1, a phase modulator control system for suppressing overvoltage of a converter bus at an extra-high voltage direct current transmission end comprises a phase modulator control substation and a direct current safety control system;
the phase modulator control substation is used for receiving the operation information of each phase modulator and receiving a direct current operation state signal of the direct current safety control system; and the system is used for sending the operation information of the phase modulators to the direct current safety control system and sending the command information of the phase modulators to each phase modulator.
And the direct current safety control system is used for emergency control after direct current faults, receiving the operation information of the phase modifier sent by the phase modifier control substation and sending a direct current operation state signal to the phase modifier control substation. The operation information of the phase modulator includes: the method comprises the following steps of (1) running and stopping information of a phase modulator, whether the phase modulator is in a defervescence period after forced excitation, a working mode of an excitation control system of the phase modulator, and real-time running voltage and reactive power of the phase modulator;
the phase modulator command information comprises a phase modulator working mode switching command, a working mode command, a reactive power reference command and a voltage reference command.
The direct current running state signal comprises a direct current normal running signal and a direct current blocking signal.
The operation information of the phase modulator control substation comprises the operation and shutdown information of a phase modulator group, whether the phase modulator is in a defervescence period after forced excitation, the working mode of an excitation control system, and the real-time operation voltage and the reactive power of the phase modulator;
example 2:
a kind of extra-high voltage direct current sends the phase modulation controlling device of the end converter station, comprising:
the reactive power control mode setting module is used for responding to a received direct current normal operation signal sent by the direct current safety control system, sending a phase modifier reactive power control mode instruction and a reactive power reference value instruction to a phase modifier group, setting the phase modifier group to work in a reactive power control mode, and setting the reactive power of each phase modifier as each reactive power reference value;
and the voltage control mode setting module is used for responding to a received direct current blocking signal or a direct current low-power operation signal sent by the direct current safety control system and sending a voltage control mode instruction and a voltage reference value instruction to the phase modulator group so as to enable the phase modulator group to operate in a voltage control mode.
Further, the direct-current safety control system judges whether the current steady-state running power of the direct current is larger than the maximum threshold value of the direct-current running power, and if not, the direct-current safety control system sends a direct-current low-power running signal to the phase modulator control substation;
if the direct current is greater than the preset value, the direct current safety control system judges whether the direct current has the lockout fault, if the lockout fault occurs, the direct current safety control system sends a direct current lockout signal to the phase modulator control substation, and otherwise, the direct current safety control system sends a direct current normal operation signal to the phase modulator control substation.
Example 3:
as shown in fig. 2, a phase modulator control method for suppressing an overvoltage of an extra-high voltage dc transmitting end converter bus includes the following steps:
step 1: based on actual power grid electromechanical transient simulation data, models and parameters, adjusting an operation mode to ensure that direct current operates in a maximum overcompensation mode (a direct current system provides reactive power for an alternating current system), and setting an expected direct current fault set
Figure BDA0002508504390000051
Where m is the total number of expected failures,
Figure BDA0002508504390000052
determining a transient voltage rise limit value deltav of the converter station alternating-current bus according to operation regulations for the ith expected fault, i 1,2Hmax. Obtaining the direct current running power P through electromechanical transient simulation analysisdcTime-pieceThe maximum transient state voltage rise of the AC bus of the converter station after the expected DC fault is
Figure BDA0002508504390000053
Wherein the content of the first and second substances,
Figure BDA0002508504390000054
to generate the ith expected DC fault
Figure BDA0002508504390000055
And transient voltage rise of the alternating current bus of the rear converter station.
The model in the step 1 comprises the following steps: generator, line, transformer, load model.
The parameters include: generator, line, transformer, load simulation parameters.
Step 2: if it is
Figure BDA0002508504390000056
By a step size Δ PdcIncreasing the DC operating power Pdc＝Pdc+ΔPdcEntering step 1; otherwise, determining the maximum threshold value of the direct current running power, which is limited by transient voltage rise of the converter station after the expected direct current fault, as P0＝Pdc-ΔPdc。
Step size Δ P in step 2dcDetermined according to practical analysis experience.
And step 3: the DC safety control system judges the current steady-state operation power P of the DCdcWhether or not it is greater than the threshold value P0If yes, the step 4 is carried out, otherwise, the direct current safety control system sends a direct current low-power operation signal to the phase modulator control substation, and the step 6 is carried out.
And 4, step 4: and (4) judging whether the direct current has a blocking fault by the direct current safety control system, if so, sending a direct current blocking signal to the phase modulator control substation, and entering step 6, otherwise, entering step 5.
And 5: the direct current safety control system sends a direct current normal operation signal to the phase modifier control substation, and the phase modifier control substation sends a phase modifier working mode instruction C after receiving the direct current normal operation signalQ(reactive power control)System mode) and a reactive power reference value to a phase modulator group, setting the phase modulator group to operate in a reactive power control mode, and setting the reactive power of the phase modulator to the reactive power reference value
Figure BDA0002508504390000057
Wherein the content of the first and second substances,
Figure BDA0002508504390000058
is the reactive power reference variable of the jth phase modulator,
Figure BDA0002508504390000059
the phase modulation is a reactive power reference value of the jth phase modulator, n is the total number of the phase modulators accessed to a phase modulator control substation, and the steady-state reactive support capability of the phase modulators is utilized to replace part of reactive compensation capacitors of a direct current system, so that the direct current system is ensured to be in an under-compensation state, and the transient overvoltage of a converter station bus after direct current commutation failure is inhibited.
The reactive power reference value
Figure BDA00025085043900000510
The size of the phase modifier is determined by the performance parameters of the phase modifier, the maximum phase delay capability of the phase modifier for long-term operation, and the actual operation empirical value.
Step 6: after receiving a blocking signal or a direct-current low-power running signal sent by the direct-current safety control system, the phase modulator control substation sends a working mode instruction CV(Voltage control mode) and a voltage reference value command Vref_tAnd switching the phase modulator group to operate in a voltage control mode.
During the steady-state operation of the direct-current system, the phase modulator operates in a fixed reactive power control mode to replace part of reactive capacitors of the direct-current system, so that the direct-current system operates in an under-compensation mode, and the transient overvoltage problem of a bus of a converter station after the direct-current commutation failure is more favorably inhibited; meanwhile, aiming at the direct current blocking fault, under the condition of effectively identifying the direct current blocking fault, the phase modulator is changed into a constant voltage control mode, and the steady-state overvoltage after the direct current blocking fault is restrained by means of the fast and powerful excitation capability of the phase modulator. By the method, the contradiction of a direct current system compensation mode to the problem of different overvoltage of the converter station after the direct current fault is restrained is relieved, and the economical efficiency of the phase modulator is improved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (1)

1. A control method for a phase modulator of an extra-high voltage direct current sending end converter station is characterized by comprising the following steps:
responding to a received direct current normal operation signal sent by a direct current safety control system, and sending a phase modulator reactive power control mode instruction and a reactive power reference value instruction to a phase modulator group, wherein the reactive power control mode instruction is used for setting the phase modulator group to work in a reactive power control mode, and the reactive power reference value instruction is used for setting the reactive power of each phase modulator as each reactive power reference value;
in response to receiving a direct current blocking signal or a direct current low-power operation signal sent by a direct current safety control system, sending a voltage control mode instruction and a voltage reference value instruction to a phase modulator group to enable the phase modulator group to operate in a voltage control mode;
the direct-current safety control system judges whether the current steady-state running power of the direct current is larger than the maximum threshold value of the direct-current running power, and if not, the direct-current safety control system sends a direct-current low-power running signal to the phase modulator control substation;
if the direct current is greater than the preset value, the direct current safety control system judges whether the direct current has a locking fault, if the direct current has the locking fault, the direct current safety control system sends a direct current locking signal to the phase modulator control substation, and if the direct current has the locking fault, the direct current safety control system sends a direct current normal operation signal to the phase modulator control substation;
the method for acquiring the maximum threshold value of the direct current running power comprises the following steps:
obtaining the direct current running power P through electromechanical transient simulation analysisdcWhen the expected DC fault occurs, the maximum transient state voltage of the AC bus of the converter station is increased to
Figure FDA0003179423970000011
Wherein the content of the first and second substances,
Figure FDA0003179423970000012
transient voltage rise of an alternating current bus of the converter station after the ith expected direct current fault occurs;
if it is
Figure FDA0003179423970000013
ΔVHmaxFor transient voltage rise limit of AC bus of converter station, the step length is delta PdcIncreasing the DC operating power Pdc＝Pdc+ΔPdcContinuously calculating the DC operating power as PdcWhen the predicted DC fault occurs, the maximum transient state voltage rise of the AC bus of the converter station is carried out, otherwise, the maximum threshold value of the DC running power constrained by the transient state voltage rise of the converter station after the predicted DC fault is determined to be P0＝Pdc-ΔPdc。
CN202010453575.4A 2020-05-26 2020-05-26 Control method, device and system for phase modulator of extra-high voltage direct current transmitting end converter station Active CN111769569B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010453575.4A CN111769569B (en) 2020-05-26 2020-05-26 Control method, device and system for phase modulator of extra-high voltage direct current transmitting end converter station

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010453575.4A CN111769569B (en) 2020-05-26 2020-05-26 Control method, device and system for phase modulator of extra-high voltage direct current transmitting end converter station

Publications (2)

Publication Number Publication Date
CN111769569A CN111769569A (en) 2020-10-13
CN111769569B true CN111769569B (en) 2021-09-28

Family

ID=72719584

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010453575.4A Active CN111769569B (en) 2020-05-26 2020-05-26 Control method, device and system for phase modulator of extra-high voltage direct current transmitting end converter station

Country Status (1)

Country Link
CN (1) CN111769569B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107342630A (en) * 2017-07-31 2017-11-10 国电南瑞科技股份有限公司 A kind of phase modifier emergency control method and system for suppressing the continuous commutation failure of direct current
CN109586311A (en) * 2018-12-12 2019-04-05 国家电网有限公司 A kind of control method for coordinating of phase modifier and DC converter station reactive power compensator
CN109698507A (en) * 2018-10-23 2019-04-30 中国电力科学研究院有限公司 A kind of phase modifier and Static Var Compensator control method for coordinating and system
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

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109638870B (en) * 2018-12-22 2022-05-13 国网辽宁省电力有限公司电力科学研究院 Phase modulator configuration method of extra-high voltage direct current transmission end power grid
CN110661269A (en) * 2019-11-03 2020-01-07 国网湖北省电力有限公司电力科学研究院 Phase modulator reactive power rapid supporting method for resisting direct-current continuous commutation failure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107342630A (en) * 2017-07-31 2017-11-10 国电南瑞科技股份有限公司 A kind of phase modifier emergency control method and system for suppressing the continuous commutation failure of direct current
CN109698507A (en) * 2018-10-23 2019-04-30 中国电力科学研究院有限公司 A kind of phase modifier and Static Var Compensator control method for coordinating and system
CN109586311A (en) * 2018-12-12 2019-04-05 国家电网有限公司 A kind of control method for coordinating of phase modifier and DC converter station reactive power compensator
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

Also Published As

Publication number Publication date
CN111769569A (en) 2020-10-13

Similar Documents

Publication Publication Date Title
Errouissi et al. Offset-free direct power control of DFIG under continuous-time model predictive control
CN109586311B (en) Coordination control method for phase modulator and reactive power compensation device of direct current converter station
CN109698507B (en) Phase modulator and static var compensator coordinated control method and system
CN104022528A (en) Method for micro-grid system coordinated control based on multi-element composite energy storage
CN110970940B (en) Phase modulator excitation system applied to field of direct-current power transmission and control method thereof
CN103986173A (en) Power electronic transformer control method and system
CN106026122A (en) Integrated asynchronous excitation phase modifier and reactive compensation and active balance method thereof
CN103795081A (en) Method for controlling low voltage ride-through of direct-drive type wind power system
CN110544938A (en) Low-voltage microgrid grid-connected and off-grid control method containing battery and super capacitor
CN110707719A (en) Dynamic control method for voltage of bus on additional high-voltage side of high-capacity phase modulator
CN102868178B (en) Method for improving grid-connected transient stability in wind power plant voltage automatic control system
CN111769569B (en) Control method, device and system for phase modulator of extra-high voltage direct current transmitting end converter station
Zhao et al. Transient voltage and transient frequency stability emergency coordinated control strategy for the multi-infeed HVDC power grid
CN113765159B (en) Method and system for improving voltage control capability of new energy station based on coordination control
CN109193698B (en) Method for realizing primary frequency modulation of wind power plant based on super capacitor and direct current bus capacitor
CN113300397A (en) Alternating current-direct current reactive power exchange reference value optimization method and system
Du et al. Frequency Stabilization Control Method for Industrial Microgrid Considering Inertia Response of Electrolytic Aluminum Load
CN112398138B (en) Voltage reactive coordination control method and system for synchronous phase modulator of high-voltage converter station
CN111756051B (en) Direct-current transmission reactive compensation device, control method and system
CN111711169B (en) Pumped storage unit magnetic loss protection judgment method
Han et al. Study on the reactive power coordinated control in hybrid parallel HVDC system
CN112542850B (en) Active power balance-based multi-terminal direct-current distribution network voltage difference-free control method
CN114069672B (en) Energy storage system control method and energy storage system
Li et al. Research on regional emergency DC power support strategy of VSC-MTDC transmission system
CN111786425B (en) Excitation control method for suppressing commutation failure of generator

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
GR01 Patent grant
GR01 Patent grant