CN110783902A - Line fault detection method, device and medium for multi-terminal direct current transmission system - Google Patents
Line fault detection method, device and medium for multi-terminal direct current transmission system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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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- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses a line fault detection method of a multi-terminal direct current transmission system, which is suitable for the multi-terminal direct current transmission system with a converter station capable of polarity conversion, wherein when the polarity conversion of the converter station capable of polarity conversion of the multi-terminal direct current transmission system occurs, a pole 1 line protection device detects the change of the electrical quantity of a voltage and current measurement device of a pole 2 in real time, and sends a control instruction to a pole 1 pole control device when judging that the direct current line fault of the pole 2 occurs; and the pole control device of the pole 1 executes clearing operation on the fault of the direct current line of the pole 2 according to the control instruction. The invention also discloses a line fault detection device of the multi-terminal direct current transmission system, and the line protection device detects the electric quantity of the voltage and current measurement devices of different poles by acquiring the running mode of the direct current transmission system, so that the pole control device and the line protection device of the same pole are independent in communication, and the system is convenient to overhaul and operate.
Description
Technical Field
The invention relates to the technical field of control and protection of multi-terminal direct current engineering, in particular to a line fault detection method, a line fault detection device and a line fault detection medium for a multi-terminal direct current transmission system.
Background
A typical three-terminal conventional dc transmission system with converter station polarity reversal comprises three converter stations, station a, station B, and station C, station B being an intermediate bus station. Each converter station is of a bipolar structure and comprises a pole 1 converter and a pole 2 converter, and three-terminal bipolar operation can be realized. The direct current direction of the conventional direct current converter is fixed due to the unidirectional conductivity of the current of the thyristor. Referring to fig. 1, a schematic diagram of a three-terminal dc power transmission system including polarity conversion of a converter station in the prior art is shown, where a station a serves as a transmitting terminal, a station C serves as a receiving terminal, and a station B serves as both a transmitting terminal and a receiving terminal. When the converter station does not generate polarity conversion, the three-terminal direct-current transmission system has an operation mode of two transmitting terminals and one receiving terminal; through the polarity conversion of the converter station, the three-terminal direct-current transmission system has an operation mode of one transmitting terminal and two receiving terminals.
The poles 1 and 2 of the station B are each provided with a pole control device and a line protection device. The polar control devices of the same pole correspond to the converters one by one, the polar control device 1 is used for controlling and operating the corresponding converter, the polar control device 2 is used for controlling and operating the corresponding converter, and the control and operation mainly comprises unlocking, line fault clearing and the like. The pole-1 line protection device is configured to detect a change in an electrical quantity of the voltage-current measurement devices (UdL1, IdL1, IdL, UdL3, IdL3) of the pole 1 to detect a fault on the pole-1 direct-current line and notify the pole-1 pole control device to perform a line fault clearing operation; the pole 2 line protection device is configured to detect a change in an electrical quantity of the pole 2 voltage current measurement devices (UdL1_ op, IdL1_ op, IdL _ op, UdL3_ op, IdL3_ op) to detect a fault on the pole 2 direct current line and notify the pole 2 pole control device to perform a line fault clearing operation.
However, in the process of implementing the invention, the inventor finds that the prior art has at least the following problems: referring to fig. 2, which is a schematic diagram of a line fault detection device of a three-terminal dc power transmission system in the prior art in an operating mode of one transmitting terminal and two receiving terminals, when a polarity conversion occurs in the dc power transmission system, that is, in a mode of one transmitting terminal and two receiving terminals, a dc line of a station a pole 1 is electrically connected to a converter of a station B pole 2, when a fault occurs between the pole 1 dc lines of the station a and the station B, communication between a pole 1 line protection device and a pole 2 pole control device needs to be established, the pole 1 line protection device detects the fault on the pole 1 dc line, and notifies the pole 2 pole control device to perform a fault clearing operation; similarly, when a fault occurs between the pole 2 dc lines, communication between the pole 2 protection device and the pole 1 pole control device needs to be established. This would lead to a problem of communication cross-over between the pole control devices and the line protection devices at both ends of the poles 1 and 2, which would be detrimental to the independent operation and maintenance of the structures at both ends of the poles 1 and 2.
Disclosure of Invention
The embodiment of the invention aims to provide a line fault detection method, a line fault detection device and a line fault detection medium for a multi-terminal direct current transmission system.
In order to achieve the above object, an embodiment of the present invention provides a line fault detection method for a multi-terminal dc power transmission system, which is applicable to a multi-terminal dc power transmission system including a converter station capable of polarity conversion, and includes:
acquiring an operation mode of the multi-terminal direct-current power transmission system;
when the multi-terminal direct-current transmission system is in a first operation mode, the pole 1 line protection device detects the change of the electrical quantity of the voltage and current measurement device of the pole 2 in real time, and sends a first control instruction to the pole 1 pole control device when the pole 2 direct-current line fault is judged to occur; wherein in the first operating mode, the polarity-switchable converter station of the multi-terminal direct current transmission system is switched in polarity;
and the pole control device of the pole 1 executes clearing operation on the fault of the direct current line of the pole 2 according to the first control instruction.
As an improvement of the above, when the multi-terminal dc power transmission system is in the first operation mode, the method further includes:
the pole 2 line protection device detects the change of the electrical quantity of the voltage and current measuring device of the pole 1 in real time, and sends a second control instruction to the pole 2 pole control device when judging that the direct-current line fault of the pole 1 occurs;
and the pole 2 pole control device executes clearing operation on the pole 1 direct-current line fault according to the second control instruction.
As an improvement of the above, the method further comprises:
when the multi-terminal direct-current power transmission system is in a second operation mode, the pole 1 line protection device detects the change of the electrical quantity of the voltage and current measuring device of the pole 1 in real time, and sends a third control instruction to the pole 1 pole control device when the pole 1 direct-current line fault is judged to occur; wherein, in the second operation mode, no polarity conversion occurs in the polarity-convertible converter station of the multi-terminal direct-current transmission system;
and the pole 1 pole control device executes clearing operation on the pole 1 direct-current line fault according to the third control instruction.
As an improvement to the above, when the multi-terminal dc power transmission system is in the second operation mode, the method further includes:
the pole 2 line protection device detects the change of the electrical quantity of the voltage and current measuring device of the pole 2 in real time, and sends a fourth control instruction to the pole 2 pole control device when judging that the direct-current line fault of the pole 2 occurs;
and the pole 2 pole control device executes clearing operation of the pole 2 direct-current line fault according to the fourth control instruction.
The embodiment of the invention also provides a line fault detection device of the multi-terminal direct current transmission system, which comprises a mode acquisition module, a pole 1 line protection device and a pole 1 pole control device;
the mode acquisition module is used for acquiring the operation mode of the multi-terminal direct current transmission system;
the pole 1 line protection device is used for detecting the change of the electrical quantity of the voltage and current measuring device of the pole 2 in real time when the multi-terminal direct current transmission system is in a first operation mode, and sending a first control instruction to the pole 1 pole control device when the pole 2 direct current line fault is judged to occur; wherein in the first operating mode, the polarity-switchable converter station of the multi-terminal direct current transmission system is switched in polarity;
and the pole 1 pole control device is used for executing clearing operation of the pole 2 direct current line fault according to the first control instruction.
As an improvement of the above scheme, the line fault detection device of the multi-terminal direct current transmission system further comprises a pole 2 line protection device and a pole 2 pole control device;
the pole 2 line protection device is used for detecting the change of the electrical quantity of the voltage and current measuring device of the pole 1 in real time when the multi-terminal direct current transmission system is in the first operation mode, and sending a second control instruction to the pole 2 pole control device when the pole 1 direct current line fault is judged to occur;
and the pole 2 pole control device is used for executing the clearing operation of the pole 1 direct current line fault according to the second control instruction.
An embodiment of the present invention further provides a line fault detection apparatus for a multi-terminal dc power transmission system, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, where the processor implements the line fault detection method for the multi-terminal dc power transmission system as described above when executing the computer program.
An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where when the computer program runs, a device in which the computer-readable storage medium is located is controlled to execute the line fault detection method for the multi-terminal dc power transmission system described above.
Compared with the prior art, the line fault detection method, the line fault detection device and the storage medium of the multi-terminal direct-current transmission system disclosed by the invention have the advantages that the line protection device is configured into the operation mode according to the multi-terminal direct-current transmission system in advance, the change of the electrical quantity of the voltage and current measuring device of the pole 1 or the pole 2 is correspondingly detected, and the control instruction is generated and sent to the polar control device of the same pole, so that the polar control device can clear the direct-current line fault. The electric quantity detection is carried out on the voltage and current measuring devices with different poles through the line protection device, so that the independent communication between the pole control device with the same pole and the line protection device is realized, and the overhauling operation of the system is facilitated.
Drawings
FIG. 1 is a schematic diagram of a prior art three terminal DC power transmission system including a polarity conversion converter station;
fig. 2 is a schematic structural diagram of a line fault detection device of a three-terminal dc power transmission system in a transmitting-terminal and two-receiving-terminal operation mode in the prior art;
fig. 3 is a schematic flowchart illustrating steps of a line fault detection method for a multi-terminal dc power transmission system according to an embodiment of the present invention;
fig. 4 is a schematic flow chart illustrating steps of a line fault detection method for a multi-terminal dc power transmission system according to another embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a three-terminal dc power transmission system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a line fault detection apparatus of a multi-terminal dc power transmission system according to an embodiment of the present invention;
fig. 7 is a schematic circuit diagram of a line fault detection apparatus of another multi-terminal dc power transmission system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 3, a schematic step flow diagram of a line fault detection method of a multi-terminal dc power transmission system according to an embodiment of the present invention is shown.
The embodiment of the invention provides a line fault detection method for a multi-terminal direct current transmission system, which is suitable for the multi-terminal direct current transmission system with converter stations capable of polarity conversion, wherein the multi-terminal direct current transmission system is a direct current transmission system with a plurality of converter stations (rectifier stations or/and inverter stations). The power transmission system has the most remarkable characteristics of realizing multi-power supply and multi-drop power receiving, providing a more flexible power transmission mode and having various operation modes. The multi-terminal direct current transmission system can be applied to: delivering electrical energy from a plurality of energy bases to one or more remote load centers; large cities or industrial centers that cannot use overhead line corridors; the middle branch of the direct current transmission line is connected with a load or a power supply; and non-synchronous connection of the power grid and the like is realized among a plurality of isolated alternating current systems by using a direct current transmission line.
In a multi-terminal direct current transmission system, a direct current converter has a fixed direct current direction due to the unidirectional conductivity of the current of a thyristor. The converter station capable of polarity conversion is provided with a polarity conversion knife switch, and the requirements of serving as a sending end and a receiving end are met through the combined connection of the knife switches.
The line fault detection method of the multi-terminal direct current power transmission system is executed through steps S11 to S13:
s11, acquiring the operation mode of the multi-terminal direct current transmission system;
and judging whether the polarity conversion of the converter station capable of performing polarity conversion of the multi-terminal direct-current transmission system occurs or not by acquiring the operation mode of the multi-terminal direct-current transmission system. For example, referring to fig. 5, a schematic circuit structure diagram of a three-terminal dc power transmission system according to an embodiment of the present invention is shown; when the multi-terminal direct-current power transmission system is a three-terminal direct-current power transmission system, the three-terminal direct-current power transmission system comprises a station A serving as a sending terminal, a station C serving as a receiving terminal and a station B capable of polarity conversion, when the polarity conversion does not occur in the station B, the station B serving as the sending terminal, a pole 1 of the station A, a pole 1 of the station C and a pole 1 of the station B are electrically connected, a pole 2 of the station A, a pole 2 of the station C and a pole 2 of the station B are electrically connected, and the three-terminal direct-current power transmission system is in an operation mode of one receiving terminal of two sending terminals. When the polarity conversion station B is subjected to polarity conversion, the station B is used as a receiving end, at the moment, the pole 1 of the station A, the pole 1 of the station C and the pole 2 of the station B are electrically connected, the pole 2 of the station A, the pole 2 of the station C and the pole 1 of the station B are electrically connected, and the three-terminal direct-current power transmission system is in an operation mode of one transmitting end and two receiving ends.
S12, when the multi-terminal direct-current power transmission system is in a first operation mode, the pole 1 line protection device detects the change of the electrical quantity of the voltage and current measuring device of the pole 2 in real time, and when the pole 2 direct-current line fault is judged to occur, a first control instruction is sent to the pole 1 control device; wherein in the first operating mode, the polarity-switchable converter station of the multi-terminal direct current transmission system is switched in polarity;
and S13, the pole 1 pole control device executes clearing operation on the pole 2 direct current line fault according to the first control command.
And setting the condition that the polarity of the converter station capable of converting the polarity of the multi-terminal direct current transmission system is converted into the first operation mode. By way of example, when the multi-terminal dc transmission system is a three-terminal dc transmission system and is in the first operating mode, the pole 1 of station a, the pole 1 of station C and the pole 2 of station B are electrically connected, the pole 2 of station a, the pole 2 of station C and the pole 1 of station B are electrically connected, and the three-terminal dc transmission system is in one transmitting-terminal and two receiving-terminal operating mode. The pole 1 line protection device detects the electric quantity change of voltage and current measuring devices (UdL1_ op, IdL1_ op, IdL _ op, UdL3_ op and IdL3_ op) of a pole 2 direct current line in real time, and judges whether a direct current line fault occurs or not through the electric quantity change of the pole 2. When the electrical quantity of the voltage and current measuring device of the pole 2 is abnormally changed, the direct-current line fault of the pole 2 is judged to occur, and at the moment, the direct-current line protection device of the pole 1 sends a first control instruction to the pole control device of the pole 1. And the first control instruction is used for controlling the pole 1 pole control device to execute the clearing operation of the pole 2 direct-current line fault.
Further, referring to fig. 3, when the multi-terminal dc power transmission system is in the first operation mode, the method further includes steps S14 and S15:
s14, the pole 2 line protection device detects the change of the electrical quantity of the voltage and current measuring device of the pole 1 in real time, and when the pole 1 direct current line fault is judged to occur, a second control instruction is sent to the pole 2 pole control device;
and S15, the pole 2 pole control device executes clearing operation on the pole 1 direct current line fault according to the second control instruction.
In the above example, when the three-terminal dc power transmission system is in the first operation mode, the pole 2 line protection device detects the change of the electrical quantity of the voltage and current measurement devices (UdL1, IdL1, IdL, UdL3, IdL3) of the pole 1 dc line in real time, and determines whether the dc line fault occurs according to the change of the electrical quantity of the pole 1. When the electrical quantity of the voltage and current measuring device of the pole 1 is abnormally changed, the direct current line fault of the pole 1 is judged to occur, and at the moment, the direct current line protection device of the pole 2 sends a second control instruction to the pole control device of the pole 2. And the second control instruction is used for controlling the pole 2 pole control device to execute the clearing operation of the pole 1 direct-current line fault.
It can be understood that the three-terminal dc transmission system provided in the embodiment of the present invention is only an example, and in practical applications, the multi-terminal dc transmission system may also be other multi-terminal dc systems including a polarity conversion converter station, which do not affect the beneficial effects obtained by the present invention.
Compared with the prior art, in the line fault detection method for the multi-terminal direct current transmission system provided by the embodiment of the invention, the pole 1 line protection device is configured to be capable of detecting the change of the electrical quantity of the voltage and current measurement device of the pole 2 direct current line, and the pole 2 line protection device is configured to be capable of detecting the change of the electrical quantity of the voltage and current measurement device of the pole 1 direct current line. When the polarity of the converter station capable of switching the polarity is switched, generating a control instruction to realize the execution control of the pole control device of the pole 1 through the electric quantity detection and fault judgment of the direct current line of the pole 2 by the pole 1 line protection device; and generating a control instruction to realize the execution control of the pole 2 pole control device by detecting the electric quantity and judging the fault of the pole 1 direct-current line through the pole 2 line protection device. The polar control device and the line protection device which are homopolar are independent in communication, and the system is convenient to overhaul.
Example two
Referring to fig. 4, a schematic step flow chart of another line fault detection method for a multi-terminal dc power transmission system according to an embodiment of the present invention is shown. On the basis of the first embodiment, the line fault detection method for the multi-terminal dc power transmission system further includes steps S21 to S22:
s21, when the multi-terminal direct-current power transmission system is in a second operation mode, the pole 1 line protection device detects the change of the electrical quantity of the voltage and current measuring device of the pole 1 in real time, and when the pole 1 direct-current line fault is judged to occur, a third control instruction is sent to the pole 1 pole control device; wherein, in the second operation mode, no polarity conversion occurs in the polarity-convertible converter station of the multi-terminal direct-current transmission system;
and S22, the pole 1 pole control device executes clearing operation on the pole 1 direct current line fault according to the third control command.
And judging whether the polarity conversion of the converter station capable of performing polarity conversion of the multi-terminal direct-current transmission system occurs or not by acquiring the operation mode of the multi-terminal direct-current transmission system. And setting the condition that the polarity conversion of the converter station capable of converting the polarity of the multi-terminal direct current transmission system does not occur to be the second operation mode. For example, referring to fig. 5, when the multi-terminal dc power transmission system is a three-terminal dc power transmission system, when the multi-terminal dc power transmission system is in the second operation mode, the pole 1 of the station a, the pole 1 of the station C, and the pole 1 of the station B are electrically connected, the pole 2 of the station a, the pole 2 of the station C, and the pole 2 of the station B are electrically connected, the three-terminal dc power transmission system is in the two-sending-end and one-receiving-end operation mode, the pole 1 line protection device detects the change of the electrical quantities of the voltage and current measurement devices (UdL1, IdL1, IdL, UdL3, IdL3) of the pole 1 dc line in real time, and judges whether a dc line fault occurs according to the change of the electrical quantities of the. When the electrical quantity of the voltage and current measuring device of the pole 1 is abnormally changed, the direct current line fault of the pole 1 is judged to occur, and at the moment, the direct current line protection device of the pole 1 sends a third control command to the pole 1 control device. And the third control instruction is used for controlling the pole 1 pole control device to execute the clearing operation of the pole 1 direct-current line fault.
Further, referring to fig. 4, when the multi-terminal dc power transmission system is in the second operation mode, the method further includes steps S23 and S24:
s23, the pole 2 line protection device detects the change of the electrical quantity of the voltage and current measuring device of the pole 2 in real time, and when the pole 2 direct current line fault is judged to occur, a fourth control instruction is sent to the pole 2 pole control device;
and S24, the pole 2 pole control device executes clearing operation on the pole 2 direct current line fault according to the fourth control instruction.
In the above example, when the three-terminal dc power transmission system is in the second operation mode, the pole 2 line protection device detects the electrical quantity change of the voltage and current measurement devices UdL1_ op, IdL1_ op, IdL _ op, UdL3_ op, and IdL3_ op) of the pole 2 dc line in real time, and determines whether the dc line fault occurs according to the electrical quantity change of the pole 2. When the electrical quantity of the voltage and current measuring device of the pole 2 is abnormally changed, the direct-current line fault of the pole 2 is judged to occur, and at the moment, the direct-current line protection device of the pole 2 sends a fourth control instruction to the pole 2 control device. And the fourth control instruction is used for controlling the pole 2 pole control device to execute clearing operation of the pole 2 direct-current line fault.
It can be understood that the three-terminal dc transmission system provided in the embodiment of the present invention is only an example, and in practical applications, the multi-terminal dc transmission system may also be other multi-terminal dc systems including a polarity conversion converter station, which do not affect the beneficial effects obtained by the present invention.
In the line fault detection method for the multi-terminal dc transmission system provided in the second embodiment of the present invention, the pole 1 line protection device is configured to detect the change in the electrical quantity of the voltage and current measurement device of the pole 2 dc line as well as the pole 1, and the pole 2 line protection device is configured to detect the change in the electrical quantity of the voltage and current measurement device of the pole 2 dc line as well as the pole 1. And then according to the operation mode of the multi-terminal direct current transmission system, when judging whether the polarity conversion of the converter station capable of performing polarity conversion occurs, the polar 1 and polar 2 line protection devices realize the electric quantity detection and fault judgment of corresponding direct current lines according to different operation modes, and further execute control on the polar control devices of the same polarity, so that the independent communication between the polar control devices and the line protection devices of the same polarity is realized in different operation modes, and the system maintenance operation is convenient.
EXAMPLE III
Referring to fig. 6, which is a schematic circuit structure diagram of a line fault detection apparatus of a multi-terminal dc power transmission system according to an embodiment of the present invention, the line fault detection apparatus 30 of the multi-terminal dc power transmission system includes a mode obtaining module 31, a pole 1 line protection apparatus 321, and a pole 1 pole control apparatus 331;
the mode obtaining module 31 is configured to obtain an operation mode of the multi-terminal dc power transmission system;
the pole-1 line protection device 321 is configured to detect, in real time, an electrical quantity change of the voltage and current measurement device of the pole 2 when the multi-terminal dc power transmission system is in the first operation mode, and send a first control instruction to the pole-1 pole control device when it is determined that a pole-2 dc line fault occurs; wherein in the first operating mode, the polarity-switchable converter station of the multi-terminal direct current transmission system is switched in polarity;
and the pole 1 pole control device 331 is configured to execute an operation of clearing the pole 2 dc line fault according to the first control instruction.
Further, the line fault detection device 30 of the multi-terminal dc power transmission system further includes a pole 2 line protection device 322 and a pole 2 pole control device 332;
the pole 2 line protection device 322 is configured to detect, in real time, an electrical quantity change of the voltage and current measurement device of the pole 1 when the multi-terminal dc power transmission system is in the first operation mode, and send a second control instruction to the pole 2 pole control device when it is determined that a pole 1 dc line fault occurs;
and the pole 2 pole control device 332 is configured to perform a clearing operation on the pole 1 dc line fault according to the second control instruction.
It should be noted that the line fault detection apparatus for a multi-terminal dc power transmission system according to the third embodiment of the present invention is configured to execute all the process steps of the line fault detection method for a multi-terminal dc power transmission system according to the first embodiment or the second embodiment, and working principles and beneficial effects of the two are in one-to-one correspondence, and thus are not described again.
In the line fault detection device of the multi-terminal dc transmission system provided by the third embodiment of the present invention, the pole 1 line protection device is configured to be able to detect both the change of the electrical quantity of the voltage and current measurement device of the pole 2 dc line and the change of the electrical quantity of the voltage and current measurement device of the pole 1 dc line and the change of the electrical quantity of the voltage and current measurement device of the pole 2 dc line. And then, the mode acquisition module acquires the operation mode of the multi-terminal direct-current transmission system, and when the polarity conversion of the converter station capable of performing polarity conversion is judged, the polar 1 and polar 2 line protection devices realize the electric quantity detection and fault judgment of corresponding direct-current lines according to different operation modes, and further execute control on the polar control devices of the same polarity, so that the communication between the polar control devices and the line protection devices of the same polarity is independent in different operation modes, and the system is convenient to overhaul and operate.
Example four
Fig. 7 is a schematic circuit structure diagram of another line fault detection apparatus for a multi-terminal dc power transmission system according to an embodiment of the present invention. The line fault detection apparatus 40 of the multi-terminal dc power transmission system according to the fourth embodiment of the present invention includes a processor 41, a memory 42, and a computer program stored in the memory and configured to be executed by the processor, for example, a line fault detection method of the multi-terminal dc power transmission system. The processor, when executing the computer program, implements the steps in the line fault detection method embodiment of the multi-terminal dc power transmission system described above, for example, steps S11 to S15 shown in fig. 1. Alternatively, the processor implements the functions of the modules in the embodiments of the apparatuses described above when executing the computer program, for example, the line fault detection apparatus of the multi-terminal dc power transmission system according to the third embodiment.
Illustratively, the computer program may be divided into one or more modules, which are stored in the memory 42 and executed by the processor 41 to accomplish the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program in the line fault detection apparatus 40 of the multi-terminal dc power transmission system. For example, the computer program may be divided into a pattern acquisition module, a pole 1 line protection device, a pole 1 pole control device, a pole 2 line protection device, and a pole 2 pole control device, and the specific functions of each module are as follows:
the mode acquisition module is used for acquiring the operation mode of the multi-terminal direct current transmission system;
the pole 1 line protection device is used for detecting the change of the electrical quantity of the voltage and current measuring device of the pole 2 in real time when the multi-terminal direct current transmission system is in a first operation mode, and sending a first control instruction to the pole 1 pole control device when the pole 2 direct current line fault is judged to occur; wherein in the first operating mode, the polarity-switchable converter station of the multi-terminal direct current transmission system is switched in polarity;
and the pole 1 pole control device is used for executing clearing operation of the pole 2 direct current line fault according to the first control instruction.
The pole 2 line protection device is used for detecting the change of the electrical quantity of the voltage and current measuring device of the pole 1 in real time when the multi-terminal direct current transmission system is in a first operation mode, and sending a second control instruction to the pole 2 pole control device when the pole 1 direct current line fault is judged to occur;
and the pole 2 pole control device is used for executing the clearing operation of the pole 1 direct current line fault according to the second control instruction.
The line fault detection device 40 of the multi-terminal dc power transmission system may be a desktop computer, a notebook computer, a palm computer, a cloud server, or other computing devices. The line fault detection device 40 of the multi-terminal dc power transmission system may include, but is not limited to, a processor 41 and a memory 42. It will be appreciated by a person skilled in the art that the schematic diagram is merely an example of the line fault detection apparatus 40 of the multi-terminal dc power transmission system, and does not constitute a limitation of the line fault detection apparatus 40 of the multi-terminal dc power transmission system, and may include more or less components than those shown, or combine some components, or different components, for example, the line fault detection apparatus 40 of the multi-terminal dc power transmission system may further include input and output devices, network access devices, buses, and the like.
The Processor 41 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor, etc. the processor 41 is a control center of the line fault detection apparatus 40 of the multi-terminal dc power transmission system, and various interfaces and lines are used to connect various parts of the line fault detection apparatus 40 of the whole multi-terminal dc power transmission system.
The memory 42 may be used to store the computer programs and/or modules, and the processor may implement the various functions of the line fault detection apparatus 40 of the multi-terminal dc power transmission system by running or executing the computer programs and/or modules stored in the memory and calling up the data stored in the memory. The memory 42 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory 42 may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
The integrated module of the line fault detection apparatus 40 of the multi-terminal dc power transmission system may be stored in a computer readable storage medium if it is implemented in the form of a software functional unit and sold or used as a stand-alone product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like.
It should be noted that the above-described embodiments of the line fault detection apparatus of the multi-terminal dc power transmission system are merely schematic, where the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. A line fault detection method of a multi-terminal direct current transmission system is suitable for the multi-terminal direct current transmission system with a converter station capable of polarity conversion, and is characterized by comprising the following steps:
acquiring an operation mode of the multi-terminal direct-current power transmission system;
when the multi-terminal direct-current transmission system is in a first operation mode, the pole 1 line protection device detects the change of the electrical quantity of the voltage and current measurement device of the pole 2 in real time, and sends a first control instruction to the pole 1 pole control device when the pole 2 direct-current line fault is judged to occur; wherein in the first operating mode, the polarity-switchable converter station of the multi-terminal direct current transmission system is switched in polarity;
and the pole control device of the pole 1 executes clearing operation on the fault of the direct current line of the pole 2 according to the first control instruction.
2. A line fault detection method for a multi-terminal direct current transmission system according to claim 1, wherein when the multi-terminal direct current transmission system is in the first mode of operation, the method further comprises:
the pole 2 line protection device detects the change of the electrical quantity of the voltage and current measuring device of the pole 1 in real time, and sends a second control instruction to the pole 2 pole control device when judging that the direct-current line fault of the pole 1 occurs;
and the pole 2 pole control device executes clearing operation on the pole 1 direct-current line fault according to the second control instruction.
3. A line fault detection method for a multi-terminal direct current transmission system according to claim 1, characterized in that the method further comprises:
when the multi-terminal direct-current power transmission system is in a second operation mode, the pole 1 line protection device detects the change of the electrical quantity of the voltage and current measuring device of the pole 1 in real time, and sends a third control instruction to the pole 1 pole control device when the pole 1 direct-current line fault is judged to occur; wherein, in the second operation mode, no polarity conversion occurs in the polarity-convertible converter station of the multi-terminal direct-current transmission system;
and the pole 1 pole control device executes clearing operation on the pole 1 direct-current line fault according to the third control instruction.
4. A line fault detection method for a multi-terminal direct current transmission system according to claim 3, wherein when the multi-terminal direct current transmission system is in the second mode of operation, the method further comprises:
the pole 2 line protection device detects the change of the electrical quantity of the voltage and current measuring device of the pole 2 in real time, and sends a fourth control instruction to the pole 2 pole control device when judging that the direct-current line fault of the pole 2 occurs;
and the pole 2 pole control device executes clearing operation of the pole 2 direct-current line fault according to the fourth control instruction.
5. A line fault detection device of a multi-terminal direct current transmission system is characterized by comprising a mode acquisition module, a pole 1 line protection device and a pole 1 pole control device;
the mode acquisition module is used for acquiring the operation mode of the multi-terminal direct current transmission system;
the pole 1 line protection device is used for detecting the change of the electrical quantity of the voltage and current measuring device of the pole 2 in real time when the multi-terminal direct current transmission system is in a first operation mode, and sending a first control instruction to the pole 1 pole control device when the pole 2 direct current line fault is judged to occur; wherein in the first operating mode, the polarity-switchable converter station of the multi-terminal direct current transmission system is switched in polarity;
and the pole 1 pole control device is used for executing clearing operation of the pole 2 direct current line fault according to the first control instruction.
6. Line fault detection apparatus for a multi-terminal direct current transmission system according to claim 5, further comprising a pole 2 line protection device and a pole 2 pole control device;
the pole 2 line protection device is used for detecting the change of the electrical quantity of the voltage and current measuring device of the pole 1 in real time when the multi-terminal direct current transmission system is in the first operation mode, and sending a second control instruction to the pole 2 pole control device when the pole 1 direct current line fault is judged to occur;
and the pole 2 pole control device is used for executing the clearing operation of the pole 1 direct current line fault according to the second control instruction.
7. Line fault detection apparatus for a multi-terminal dc power transmission system, comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the line fault detection method for the multi-terminal dc power transmission system according to any of claims 1 to 4 when executing the computer program.
8. A computer-readable storage medium, comprising a stored computer program, wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the method for line fault detection of a multi-terminal dc power transmission system according to any one of claims 1 to 4.
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