CN112217221A - Manual emergency shutdown control method for double-end flexible direct-current transmission converter station - Google Patents
Manual emergency shutdown control method for double-end flexible direct-current transmission converter station Download PDFInfo
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- CN112217221A CN112217221A CN202011086125.2A CN202011086125A CN112217221A CN 112217221 A CN112217221 A CN 112217221A CN 202011086125 A CN202011086125 A CN 202011086125A CN 112217221 A CN112217221 A CN 112217221A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention relates to a double-end flexible direct current transmission converter station manual emergency shutdown control method, which comprises the steps of firstly judging whether a converter station in which manual emergency shutdown occurs is a power transmitting end converter station or a power receiving end converter station; when the manual emergency shutdown happens to the power transmitting end converter station, the transmitting end converter station is shut down by adjusting the power instruction to zero and issuing a converter valve locking and breaker disconnection instruction, and then the power receiving end converter station is informed of the shutdown through inter-station communication; when the manual emergency shutdown happens to the power receiving end converter station, the power transmitting end converter station is informed to adjust the power to zero through inter-station communication, a converter valve locking and breaker disconnection instruction is issued, the receiving end converter station is shut down after the power transmitting end converter station is shut down, and meanwhile, the power receiving end breaker is set to be disconnected in a delayed mode, so that the requirement on operation time can be met when the inter-station communication is abnormal, and the receiving end converter station is guaranteed to be shut down in time. The invention prevents overvoltage problem caused by that the receiving end is firstly stopped when the flexible direct current transmission project operates at high power.
Description
Technical Field
The invention relates to the technical field of flexible direct current transmission, in particular to a manual emergency shutdown control method for a double-end flexible direct current transmission converter station.
Background
The manual emergency shutdown is one of important technical means for guaranteeing the operation safety of the flexible direct current transmission project. When the emergency events which endanger the safety of the equipment and personnel related to the flexible direct current transmission project or need emergency shutdown occur but the related control system is not triggered to trip or shutdown instructions, the emergency shutdown needs to be realized through manual operation by operation and maintenance personnel. When the converter station is shut down manually in an emergency, the converter station at the end is shut down by means of locking a converter valve, disconnecting an alternating current breaker and the like; for the flexible direct current transmission project with the inter-station communication function, the end converter station can be informed to stop running through the inter-station communication. When the sending end converter station is manually and emergently stopped, most of bridge arm current flows out of the converter station at the moment of locking of the converter valve, so that the voltage is reduced in a short time; when the receiving end converter station is manually and emergently stopped, most of bridge arm current flows into the converter station at the moment of locking of the converter valve, the capacitor is charged and the condition that capacitors of upper and lower bridge arm submodules are all put into use occurs, direct current overvoltage of 2 times of rated direct current voltage occurs, and the overvoltage easily causes breakdown and other faults of devices such as switching devices, mutual inductors and the like. The existing manual emergency shutdown control strategy does not consider the shutdown time sequence matching problem of the transmitting-end converter station and the receiving-end converter station, so that a new manual emergency shutdown control method needs to be provided, the direct-current overvoltage generated during shutdown is reduced, and the operation safety and reliability of the flexible direct-current transmission are improved.
At present, when the flexible direct current transmission is manually and emergently stopped, the converter valve of the converter station is locked and the alternating current circuit breaker is disconnected only according to the occurrence place of the manual emergency stop, and a control time sequence during the manual emergency stop is not provided in relevant researches. For example, journal paper "research on true bipolar high-power test method of building door flexible direct-current transmission engineering" and academic paper "research on key technology of flexible direct-current transmission demonstration engineering in shanghai, south china" all propose an artificial emergency shutdown function of flexible direct-current transmission engineering, but do not propose a corresponding control timing sequence and control method. For example, journal papers "MMC latch-up run-time direct current side overvoltage analysis" and "flexible direct current grid direct current overvoltage analysis and control strategy research" all propose that when a converter valve of a receiving end converter station latches or fails, its input power is greater than output power, and this unbalanced power will charge a sub-module capacitor of the converter station and cause a rise in direct current voltage, which is likely to cause damage to the converter valve equipment, and when the converter valve of the sending end converter station latches or fails, the dc voltage fluctuation caused by the latch-up or failure is small and has no influence on the converter valve equipment. Because the existing manual emergency shutdown control method does not distinguish a transmitting-end converter station from a receiving-end converter station, if the receiving-end converter station is manually and emergently shutdown, direct-current overvoltage occurs after the converter valve is locked, and the existing research does not further provide a control method for the converter valve to be locked and quit the operation, so that the danger of the direct-current overvoltage exists when the flexible direct-current transmission is manually and emergently shutdown.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for controlling an artificial emergency shutdown of a double-end flexible direct-current transmission converter station, and aims to solve the problem that the existing method for the artificial emergency shutdown of the flexible direct-current transmission lacks the timing sequence coordination between a transmitting-end converter station and a receiving-end converter station.
The invention is realized by adopting the following scheme: a manual emergency shutdown control method for a double-end flexible direct current transmission converter station comprises the following steps:
step S1: the double-end flexible direct-current transmission converter station comprises a power transmitting end converter station and a power receiving end converter station, a manual emergency shutdown button of the flexible direct-current transmission converter station is pressed down, whether feasibility conditions of a manual emergency shutdown control method are met or not is judged, if yes, the judgment of the step S2 is carried out, otherwise, the end converter station transmits a converter valve locking and circuit breaker disconnection instruction, and the step S3 is executed;
step S2: judging whether the converter station with the pressed manual emergency shutdown button is a power transmitting end converter station or a power receiving end converter station, if so, starting a power receiving end breaker delayed disconnection timer and informing the power transmitting end converter station of shutdown; otherwise, the power sending end converter station;
step S3: and the circuit breaker executes the command, and the operation and maintenance personnel check the equipment state and confirm that the operation is stopped.
Further, in step S2, when the power receiving end converter station presses the manual emergency shutdown button, the control process specifically includes: starting a power receiving end circuit breaker delayed disconnection timer, and informing the power transmitting end converter station to stop operation by the power receiving end converter station through inter-station communication; after the power sending end converter station receives the inter-station communication, a power step mode is adopted to adjust a power instruction to zero at the fastest rate; after the power instruction is zero, the power sending end converter station sends out a converter valve locking and breaker disconnecting instruction; the power transmitting end converter station informs the power receiving end converter station of issuing a shutdown instruction through inter-station communication, and the power receiving end converter station issues a converter valve locking and breaker disconnecting instruction; and in the operation process, judging whether the delay time of the circuit breaker is reached in real time, if so, issuing a converter valve locking and circuit breaker disconnecting instruction to the power receiving end converter station, and if not, returning to the judgment again.
Further, in step S2, when the power transmitting end converter station presses the manual emergency shutdown button, the control process specifically includes: adjusting the power instruction to zero at the fastest rate by adopting a power step mode, transmitting a converter valve locking and circuit breaker disconnecting instruction by the power transmitting end converter station, and stopping the power transmitting end converter station; the power transmitting end converter station informs the power receiving end converter station to stop running through inter-station communication, the power receiving end converter station gives a converter valve locking and breaker disconnecting instruction, and the power receiving end converter station stops running.
Further, the feasibility conditions of the manual emergency shutdown control method are specifically as follows: the power transmitting end converter station is in a power control mode, the power receiving end converter station is in a direct-current voltage control mode, inter-station communication is carried out between the converter stations at the two ends, and both the converter stations at the two ends are provided with manual emergency shutdown buttons.
Further, the delayed opening starting of the power receiving-end circuit breaker specifically comprises the following steps:
step Sa: when the power receiving end converter station presses down a manual emergency shutdown button, a timer t starts to time;
and Sb: when the emergency shutdown control process of the power receiving end converter station is normally executed, the control time is T0To the control time T0Then, the circuit breaker delay disconnection control function is cancelled, and the step Sd is carried out;
step Sc: if an inter-station communication fault occurs and the emergency shutdown control process of the power receiving end converter station is not normally executed, the timer T continues timing, and when the time T of the delayed disconnection action of the circuit breaker is reached, the power receiving end converter station issues a converter valve locking and circuit breaker disconnection instruction;
step Sd: and the circuit breaker of the power receiving end converter station executes the command, and operation and maintenance personnel check the equipment state and confirm that the operation is stopped.
Further, the specific calculation process of the breaker delayed opening action time T in the step Sd is as follows:
the time T of the delayed opening action of the power receiving end circuit breaker is not less than the time T of the normal execution of the control procedure when the power receiving end converter station is in emergency shutdown0Maximum value of (d); time T for controlling normal execution of flow during emergency shutdown of power receiving end converter station0Maximum value of (T)0maxThe calculation process is as follows:
the longest time T for the power receiving end converter station and the power sending end converter station to finish one inter-station communication1Equal to the communication delay t1And a communication interval t2And (3) the sum:
maximum time T for regulating power to zero of power receiving end converter station2The maximum amplitude of the power step is delta P, and the time for completing one power step is t3：
Maximum value of control time when emergency shutdown control flow is normally executedT0maxComprises the following steps:
the time T of the delayed breaking action of the circuit breaker is not less than T0maxThe calculation formula is as follows:
compared with the prior art, the invention has the following beneficial effects:
(1) the invention solves the practical problem of direct-current overvoltage caused by emergency shutdown of the power receiving end converter station in practical engineering. The amplitude of direct current overvoltage is limited by adjusting the power instruction of the power transmitting end converter station to zero and then locking the time sequence cooperation of the converter valves of the power receiving end converter station, and the reliability of manual emergency shutdown of flexible direct current transmission is improved.
(2) The invention considers the actual situation under the condition of interstation communication failure, and can ensure the operation time requirement of emergency shutdown when the interstation communication fails through the delayed disconnection function of the power receiving end circuit breaker.
(3) The invention provides a specific control method and a specific control flow for 'manual emergency shutdown of flexible direct current transmission', and fills the blank of related research and method defects.
Drawings
FIG. 1 is a flow chart of a method according to an embodiment of the present invention.
Fig. 2 is a flowchart of operation steps of a power transmitting end converter station according to an embodiment of the present invention when a manual emergency shutdown button is pressed.
Fig. 3 is a flowchart of operation steps of the power receiving end converter station according to the embodiment of the present invention when the manual emergency shutdown button is pressed.
Fig. 4 is a timing chart of the coordination of the delayed opening and the normal shutdown control of the power receiving-end circuit breaker according to the embodiment of the invention.
Fig. 5 is a schematic diagram illustrating calculation of the time delay opening action time of the power receiving terminal circuit breaker according to the embodiment of the invention.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1, the present embodiment provides a method for controlling an artificial emergency shutdown of a double-end flexible direct-current transmission converter station, including the following steps:
step S1: the double-end flexible direct-current transmission converter station comprises a power transmitting end converter station and a power receiving end converter station, a manual emergency shutdown button of the flexible direct-current transmission converter station is pressed down, whether feasibility conditions of a manual emergency shutdown control method are met or not is judged, if yes, the judgment of the step S2 is carried out, otherwise, the end converter station transmits a converter valve locking and circuit breaker disconnection instruction, and the step S3 is executed;
step S2: judging whether the converter station with the pressed manual emergency shutdown button is a power transmitting end converter station or a power receiving end converter station, if so, starting a power receiving end breaker delayed disconnection timer and informing the power transmitting end converter station of shutdown; otherwise, the power sending end converter station;
step S3: and the circuit breaker executes the command, and the operation and maintenance personnel check the equipment state and confirm that the operation is stopped.
In this embodiment, in step S2, when the power receiving end converter station presses the manual emergency shutdown button, the control process specifically includes: starting a power receiving end circuit breaker delayed disconnection timer, and informing the power transmitting end converter station to stop operation by the power receiving end converter station through inter-station communication; after the power sending end converter station receives the inter-station communication, a power step mode is adopted to adjust a power instruction to zero at the fastest rate; after the power instruction is zero, the power sending end converter station sends out a converter valve locking and breaker disconnecting instruction; the power transmitting end converter station informs the power receiving end converter station of issuing a shutdown instruction through inter-station communication, and the power receiving end converter station issues a converter valve locking and breaker disconnecting instruction; and in the operation process, judging whether the delay time of the circuit breaker is reached in real time, if so, issuing a converter valve locking and circuit breaker disconnecting instruction to the power receiving end converter station, and if not, returning to the judgment again.
In this embodiment, in step S2, when the power sending end converter station presses the manual emergency shutdown button, the control process specifically includes: in step S2, the control process when the power transmission end converter station presses the manual emergency shutdown button is specifically: adjusting the power instruction to zero at the fastest rate by adopting a power step mode, transmitting a converter valve locking and circuit breaker disconnecting instruction by the power transmitting end converter station, and stopping the power transmitting end converter station; the power transmitting end converter station informs the power receiving end converter station to stop running through inter-station communication, the power receiving end converter station gives a converter valve locking and breaker disconnecting instruction, and the power receiving end converter station stops running.
In this embodiment, the feasibility conditions of the manual emergency shutdown control method are specifically as follows: the power transmitting end converter station is in a power control mode, the power receiving end converter station is in a direct-current voltage control mode, inter-station communication is carried out between the converter stations at the two ends, and both the converter stations at the two ends are provided with manual emergency shutdown buttons.
In this embodiment, the delayed opening and starting of the power receiving-end circuit breaker specifically includes the following steps:
step Sa: when the power receiving end converter station presses down a manual emergency shutdown button, a timer t starts to time;
and Sb: when the emergency shutdown control process of the power receiving end converter station is normally executed, the control time is T0To the control time T0Then, the delayed breaking control function of the circuit breaker is cancelled, and the step is enteredSd；
Step Sc: if an inter-station communication fault occurs and the emergency shutdown control process of the power receiving end converter station is not normally executed, the timer T continues timing, and when the time T of the delayed disconnection action of the circuit breaker is reached, the power receiving end converter station issues a converter valve locking and circuit breaker disconnection instruction;
step Sd: and the circuit breaker of the power receiving end converter station executes the command, and operation and maintenance personnel check the equipment state and confirm that the operation is stopped.
In this embodiment, the specific calculation process of the breaker delayed opening action time T in step Sd is as follows:
the time T of the delayed opening action of the power receiving end circuit breaker is not less than the time T of the normal execution of the control procedure when the power receiving end converter station is in emergency shutdown0Maximum value of (d); time T for controlling normal execution of flow during emergency shutdown of power receiving end converter station0Maximum value of (T)0maxThe calculation process is as follows:
the longest time T for the power receiving end converter station and the power sending end converter station to finish one inter-station communication1Equal to the communication delay t1And a communication interval t2And (3) the sum:
maximum time T for regulating power to zero of power receiving end converter station2The maximum amplitude of the power step is delta P, and the time for completing one power step is t3：
Maximum value T of control time when emergency shutdown control flow is normally executed0maxComprises the following steps:
the time T of the delayed breaking action of the circuit breaker is not less than T0maxThe calculation formula is as follows:
before the operation, the power transmitting end converter station is in a power control mode, the power receiving end converter station is in a direct-current voltage control mode, an inter-station communication function is achieved between the converter stations at two ends, and the inter-station communication function is normal.
In this embodiment, first, a manual emergency shutdown button is pressed to determine whether feasibility conditions of a manual emergency shutdown control method are met; then, judging whether the converter station of which the manual emergency shutdown button is pressed is a power transmitting end converter station or a power receiving end converter station, and executing a corresponding control flow according to the difference between the power transmitting end converter station and the power receiving end converter station; and finally, the circuit breaker executes the command, and the operation and maintenance personnel check the equipment state and confirm that the operation is stopped.
Specifically, firstly, a converter station in which an artificial emergency shutdown occurs is judged to be a power transmitting end or a power receiving end converter station; when the manual emergency shutdown happens to the power transmitting end converter station, the transmitting end converter station is shut down by adjusting the power instruction to zero and issuing a converter valve locking and breaker disconnection instruction, and then the power receiving end converter station is informed of the shutdown through inter-station communication; when the manual emergency shutdown happens to the power receiving end converter station, the power transmitting end converter station is informed to adjust the power to zero through inter-station communication, a converter valve locking and breaker disconnection instruction is issued, the receiving end converter station is shut down after the power is reduced to zero, and meanwhile, the power receiving end breaker is set to be disconnected in a delayed mode, so that the requirement on operation time can be met when the inter-station communication is abnormal, and the receiving end converter station is guaranteed to be shut down in time. The embodiment prevents overvoltage problem caused by that the receiving end is firstly stopped when the flexible direct current transmission project is operated at high power, and provides a control method for safe stop of the flexible direct current transmission project.
As shown in fig. 2, the operation steps of the power transmitting end converter station when the manual emergency shutdown button is pressed are as follows,
the power sending end converter station adjusts the power instruction to zero; the power transmitting end converter station transmits a converter valve locking and circuit breaker disconnecting instruction; the power transmitting end converter station informs the power receiving end converter station to stop running through inter-station communication; and the power receiving end converter station sends a converter valve locking and breaker disconnecting instruction.
As shown in fig. 3, the operation steps of the power receiving end converter station when the manual emergency shutdown button is pressed are as follows,
the power receiving end circuit breaker is started in a delayed disconnection mode; the power receiving end converter station informs the power transmitting end converter station to stop running through inter-station communication; the power sending end converter station adjusts the power instruction to zero; the power transmitting end converter station transmits a converter valve locking and circuit breaker disconnecting instruction; the power transmitting end converter station informs the power receiving end converter station of the outage instruction through inter-station communication; and the power receiving end converter station sends a converter valve locking and breaker disconnecting instruction.
When the manual emergency shutdown button is pressed down by the power receiving end converter station, according to the control method shown in fig. 3, if a communication fault between the stations occurs, the possibility that the circuit breaker is not disconnected by the power receiving end converter station for a long time exists, and finally shutdown failure is caused, so that the power receiving end circuit breaker delayed disconnection control method is provided. As shown in fig. 4, the coordination timing of the delayed opening and the normal shutdown control of the power receiving-end circuit breaker includes the following steps,
step 1: when the power receiving end converter station presses down a manual emergency shutdown button, a timer t starts to time;
step 2: the power receiving end converter station communicates between the nearest primary stations to inform the power sending end converter station to stop operating, and the time required by communication is tdelay1(ii) a The power instruction is adjusted to zero by the power sending end converter station, and the required adjusting time is tp(ii) a The power transmitting end converter station gives a converter valve locking and breaker disconnecting instruction, and simultaneously the power transmitting end converter station informs the power receiving end converter station that a shutdown instruction is given in the latest inter-station communication, and the time required by the communication is tdelay2(ii) a And the power receiving end converter station sends a converter valve locking and breaker disconnecting instruction after receiving the communication message.
And step 3: step 2, when the emergency shutdown control flow is normally executed, the control time is T0，T0Is calculated by the formula：
Time of arrival control T0And (5) canceling the delayed opening control function of the circuit breaker, and entering the step 5.
And 4, step 4: if the interstation communication fault occurs, if the emergency shutdown control flow is not normally executed in the step 2, the timer T continues to count time, and when the time T of the delayed opening action of the circuit breaker is reached, the power receiving end converter station sends a converter valve locking and circuit breaker opening instruction;
and 5: and the circuit breaker of the power receiving end converter station executes the command, and operation and maintenance personnel check the equipment state and confirm that the operation is stopped.
As shown in fig. 5, a schematic diagram of a method for calculating the delayed opening action time T of the power receiving-end circuit breaker,
the time T of the delayed opening action of the power receiving end circuit breaker is not less than the time T of the normal execution of the control procedure when the power receiving end converter station is in emergency shutdown0Is measured.
Time T for controlling normal execution of flow during emergency shutdown of power receiving end converter station0Maximum value of (T)0maxThe calculation process is as follows:
the longest time T for the power receiving end converter station and the power sending end converter station to finish one inter-station communication1Equal to the communication delay t1And a communication interval t2And (3) the sum:
maximum time T for regulating power to zero of power receiving end converter station2The maximum amplitude of the power step is delta P, and the time for completing one power step is t3：
Maximum value T of control time when emergency shutdown control flow is normally executed0maxComprises the following steps:
the time T of the delayed breaking action of the circuit breaker is not less than T0maxThe calculation formula is as follows:
in the embodiment, the shutdown time sequence matching of the sending end converter station and the receiving end converter station is considered, and the requirements on operation time and limitation on direct-current overvoltage are met. Meanwhile, the control method provided by the invention considers the practical problem under the condition of inter-station communication fault, and can ensure the operation time requirement of emergency shutdown when the inter-station communication fault occurs through the delayed disconnection function of the power receiving end circuit breaker. The control method provided by the invention fills the blank of the flexible direct current transmission manual emergency shutdown control strategy, and provides a method and a theoretical basis for manual emergency shutdown of the flexible direct current transmission project.
Preferably, the embodiment meets the requirement of rapidity of shutdown on one hand, and on the other hand, the shutdown time sequence coordination of the sending end converter station and the receiving end converter station is considered to limit the amplitude of the direct-current overvoltage in the shutdown process.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (6)
1. A manual emergency shutdown control method for a double-end flexible direct current transmission converter station is characterized by comprising the following steps: the method comprises the following steps:
step S1: the double-end flexible direct-current transmission converter station comprises a power transmitting end converter station and a power receiving end converter station, a manual emergency shutdown button of the flexible direct-current transmission converter station is pressed down, whether feasibility conditions of a manual emergency shutdown control method are met or not is judged, if yes, the judgment of the step S2 is carried out, otherwise, the end converter station transmits a converter valve locking and circuit breaker disconnection instruction, and the step S3 is executed;
step S2: judging whether the converter station with the pressed manual emergency shutdown button is a power transmitting end converter station or a power receiving end converter station, if so, starting a power receiving end breaker delayed disconnection timer and informing the power transmitting end converter station of shutdown; otherwise, the power sending end converter station;
step S3: and the circuit breaker executes the command, and the operation and maintenance personnel check the equipment state and confirm that the operation is stopped.
2. The method for controlling the manual emergency shutdown of the double-ended flexible direct current transmission converter station according to claim 1, characterized by comprising the following steps: in step S2, when the power receiving end converter station presses the manual emergency shutdown button, the control process specifically includes: starting a power receiving end circuit breaker delayed disconnection timer, and informing the power transmitting end converter station to stop operation by the power receiving end converter station through inter-station communication; after the power sending end converter station receives the inter-station communication, a power step mode is adopted to adjust a power instruction to zero at the fastest rate; after the power instruction is zero, the power sending end converter station sends out a converter valve locking and breaker disconnecting instruction; the power transmitting end converter station informs the power receiving end converter station of issuing a shutdown instruction through inter-station communication, and the power receiving end converter station issues a converter valve locking and breaker disconnecting instruction; and in the operation process, judging whether the delay time of the circuit breaker is reached in real time, if so, issuing a converter valve locking and circuit breaker disconnecting instruction to the power receiving end converter station, and if not, returning to the judgment again.
3. The manual emergency shutdown control method for the double-ended flexible direct current transmission converter station according to claim 1, characterized by comprising the following steps: in step S2, the control process when the power transmission end converter station presses the manual emergency shutdown button is specifically: adjusting the power instruction to zero at the fastest rate by adopting a power step mode, transmitting a converter valve locking and circuit breaker disconnecting instruction by the power transmitting end converter station, and stopping the power transmitting end converter station; the power transmitting end converter station informs the power receiving end converter station to stop running through inter-station communication, the power receiving end converter station gives a converter valve locking and breaker disconnecting instruction, and the power receiving end converter station stops running.
4. The manual emergency shutdown control method for the double-ended flexible direct current transmission converter station according to claim 1, characterized by comprising the following steps: the feasibility conditions of the manual emergency shutdown control method are as follows: the power transmitting end converter station is in a power control mode, the power receiving end converter station is in a direct-current voltage control mode, inter-station communication is carried out between the converter stations at the two ends, and both the converter stations at the two ends are provided with manual emergency shutdown buttons.
5. The manual emergency shutdown control method for the double-ended flexible direct current transmission converter station according to claim 2, characterized by comprising the following steps: the delayed disconnection starting of the power receiving end circuit breaker specifically comprises the following steps:
step Sa: when the power receiving end converter station presses down a manual emergency shutdown button, a timer t starts to time;
and Sb: when the emergency shutdown control process of the power receiving end converter station is normally executed, the control time is T0To the control time T0Then, the circuit breaker delay disconnection control function is cancelled, and the step Sd is carried out;
step Sc: if an inter-station communication fault occurs and the emergency shutdown control process of the power receiving end converter station is not normally executed, the timer T continues timing, and when the time T of the delayed disconnection action of the circuit breaker is reached, the power receiving end converter station issues a converter valve locking and circuit breaker disconnection instruction;
step Sd: and the circuit breaker of the power receiving end converter station executes the command, and operation and maintenance personnel check the equipment state and confirm that the operation is stopped.
6. The manual emergency shutdown control method for the double-ended flexible direct current transmission converter station according to claim 5, characterized by comprising the following steps: the specific calculation process of the breaker delayed opening action time T in the step Sd is as follows:
the time T of delayed opening action of the power receiving end circuit breaker is not less than that of the power receiving end converter stationTime T for normal execution of control flow during emergency shutdown0Maximum value of (d); time T for controlling normal execution of flow during emergency shutdown of power receiving end converter station0Maximum value of (T)0maxThe calculation process is as follows:
the longest time T for the power receiving end converter station and the power sending end converter station to finish one inter-station communication1Equal to the communication delay t1And a communication interval t2And (3) the sum:
maximum time T for regulating power to zero of power receiving end converter station2The maximum amplitude of the power step is delta P, and the time for completing one power step is t3：
Maximum value T of control time when emergency shutdown control flow is normally executed0maxComprises the following steps:
the time T of the delayed breaking action of the circuit breaker is not less than T0maxThe calculation formula is as follows:
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20160308359A1 (en) * | 2012-11-08 | 2016-10-20 | Nr Electric Co., Ltd | Coordination control method of multi-terminal VSC-HVDC transmission system |
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| CN102495363A (en) * | 2011-10-25 | 2012-06-13 | 南京南瑞继保电气有限公司 | Method for distinguishing shutting of +/-800 kV extra-high voltage direct-current valve group |
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| US20160308359A1 (en) * | 2012-11-08 | 2016-10-20 | Nr Electric Co., Ltd | Coordination control method of multi-terminal VSC-HVDC transmission system |
| CN103490411A (en) * | 2013-09-09 | 2014-01-01 | 南京南瑞继保电气有限公司 | Method for disposing extra-high-voltage direct current redundancy electrode control device after failure |
| CN103618331A (en) * | 2013-11-27 | 2014-03-05 | 南方电网科学研究院有限责任公司 | Direct-current overvoltage current limiting control method of flexible HVDC convertor station |
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