CN113054680A - Direct-current transmission power inversion method, device, equipment and storage medium - Google Patents
Direct-current transmission power inversion method, device, equipment and storage medium Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The invention relates to the technical field of direct current transmission, and discloses a direct current transmission power inversion method, a device, equipment and a storage medium, wherein the method comprises the following steps: acquiring a power lifting rate and a target power value after power reversal; reducing the direct current power to a first preset power value according to the power lifting rate; locking the direct current power transmission system until the direct current power is reduced to 0; when the alternating current filter is locked, the alternating current filter meeting the reverse unlocking requirement is ensured to still be put into operation; adjusting the connection mode of the direct current transmission line, the direct current pole bus and the direct current neutral bus to avoid polarity inversion of the voltage of the direct current transmission line after power inversion; reversely unlocking the direct-current power transmission system until the direct-current power is increased to a second preset power value; and increasing the direct current power to a target power value according to the power increasing and decreasing speed. The direct-current transmission power reversal method, the direct-current transmission power reversal device, the direct-current transmission power reversal equipment and the direct-current transmission power reversal storage medium can achieve rapid on-line power reversal and simultaneously guarantee the safety of submarine cables.
Description
Technical Field
The invention relates to the technical field of direct current transmission, in particular to a direct current transmission power inversion method, device, equipment and storage medium.
Background
In recent years, high-voltage power transmission technology is rapidly developed, and the high-voltage power transmission plays more and more important roles in long-distance and large-capacity power transmission and power transmission in urban centers. Generally, the power transmission direction of most direct current transmission is fixed, a power generation base at a sending end supplies power to a load center at a receiving end, a reverse transmission working condition is few, even if reverse transmission power is needed under an extreme working condition, an operator manually locks and stops the direct current transmission system firstly, then adjusts a control strategy of the direct current transmission system, and then reversely unlocks the direct current transmission system. For direct current transmission requiring frequent power reversal, such as island networking engineering, the power reversal process takes longer time and has lower efficiency. In addition, in the conventional power transmission engineering based on pure overhead wires, the voltage polarity of the overhead wires can be directly changed during power reversal, but for a direct current transmission line comprising submarine cables, because the cable discharge takes a long time, if the voltage polarity of the cable is directly changed in a short time during rapid power reversal, the submarine cables are likely to be damaged.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is as follows: the method, the device, the equipment and the storage medium for the direct-current transmission power reversal are provided, so that the safety of a submarine cable is ensured while the rapid on-line power reversal of a direct-current transmission system is realized.
In order to solve the above technical problem, in a first aspect, an embodiment of the present invention provides a dc transmission power inversion method applied to a dc transmission system of a dc transmission line including a submarine cable, including:
acquiring a power lifting rate and a target power value after power reversal;
reducing the direct current power to a first preset power value according to the power lifting rate;
locking the direct current power transmission system until the direct current power is reduced to 0; when the alternating current filter is locked, the alternating current filter meeting the reverse unlocking requirement is ensured to still be put into operation;
adjusting the connection mode of the direct current transmission line, the direct current pole bus and the direct current neutral bus to avoid polarity inversion of the voltage of the direct current transmission line after power inversion;
reversely unlocking the direct current power transmission system until the direct current power is increased to a second preset power value;
and increasing the direct current power to the target power value according to the power increasing and decreasing speed.
In a preferred embodiment, the adjusting the connection mode between the dc transmission line and the dc pole bus and the dc neutral bus specifically includes:
when the operation mode of the direct current transmission system is a bipolar operation mode, a direct current pole bus connected with a direct current transmission line is adjusted in a crossed mode;
when the operation mode of the direct current transmission system is a single-pole ground loop operation mode, stopping operating the current operated direct current transmission line, and putting into the direct current transmission line which is not put into operation before;
and when the operation mode of the direct current transmission system is a single-pole metal loop operation mode, the direct current pole bus and the direct current neutral bus connected with the direct current transmission line are adjusted in a crossed mode.
In a preferred scheme, the first preset power value is 10% of rated direct current power of the direct current power transmission system;
the second preset power value is 10% of the rated direct current power of the direct current transmission system.
In order to solve the above technical problem, in a second aspect, an embodiment of the present invention provides a dc transmission power inverting apparatus applied to a dc transmission system of a dc transmission line including a submarine cable, including:
the data acquisition module is used for acquiring the power lifting rate and the target power value after power inversion;
the first power adjusting module is used for reducing the direct current power to a first preset power value according to the power increasing and decreasing rate;
the locking module is used for locking the direct current power transmission system until the direct current power is reduced to 0; when the alternating current filter is locked, the alternating current filter meeting the reverse unlocking requirement is ensured to still be put into operation;
the circuit adjusting module is used for adjusting the connection mode of the direct-current transmission line, the direct-current pole bus and the direct-current neutral bus so as to avoid polarity inversion of the voltage of the direct-current transmission line after power inversion;
the unlocking module is used for reversely unlocking the direct-current power transmission system until the direct-current power is increased to a second preset power value;
and the second power adjusting module is used for increasing the direct current power to the target power value according to the power increasing and decreasing rate.
In a preferred embodiment, the line adjusting module specifically includes:
the first line adjusting unit is used for crossly adjusting a direct-current pole bus connected with a direct-current transmission line when the operation mode of the direct-current transmission system is a bipolar operation mode;
the second line adjusting unit is used for stopping the current running direct current transmission line and putting the direct current transmission line which is not put into operation before when the running mode of the direct current transmission system is a single-pole ground loop running mode;
and the third line adjusting unit is used for crossly adjusting the direct-current pole bus and the direct-current neutral bus connected with the direct-current transmission line when the operation mode of the direct-current transmission system is a single-pole metal loop operation mode.
In a preferred scheme, the first preset power value is 10% of rated direct current power of the direct current power transmission system;
the second preset power value is 10% of the rated direct current power of the direct current transmission system.
In order to solve the above technical problem, in a third aspect, an embodiment of the present invention provides a dc transmission power inverting apparatus, including:
a memory for storing a computer program;
a processor for executing the computer program;
wherein the processor implements the direct current transmission power inversion method according to any one of the first aspect when executing the computer program.
In order to solve the above technical problem, in a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium storing a computer program, which when executed, implements the direct-current transmission power inversion method according to any one of the first aspect.
Compared with the prior art, the direct-current transmission power inversion method, the direct-current transmission power inversion device, the direct-current transmission power inversion equipment and the storage medium have the advantages that: after the power is gradually reduced, locking is performed, the AC filter meeting the requirement of reverse unlocking is guaranteed to still be put into operation, the connection mode of the DC transmission line, the DC pole bus and the DC neutral bus is adjusted after locking, the DC transmission system is unlocked reversely under the condition that the voltage polarity of the DC transmission line is not changed, the DC power is increased to a target power value, reverse control can be automatically, quickly and online completed, the operation personnel do not need to manually operate step by step, the time consumed by power reverse is reduced, the operation efficiency is improved, the voltage polarity reverse of the submarine cable in a short time is avoided by adjusting the connection mode of the DC transmission line, the safety of the submarine cable is protected, and the stability of the DC transmission system is improved.
Drawings
In order to more clearly illustrate the technical features of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is apparent that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on the drawings without inventive labor.
Fig. 1 is a schematic flow chart of a preferred embodiment of a dc transmission power inversion method provided by the present invention;
FIG. 2 is a schematic flow chart of a preferred embodiment of step S14 in FIG. 1;
fig. 3 is a schematic structural diagram of a preferred embodiment of a dc transmission power inverting apparatus provided by the present invention;
fig. 4 is a schematic structural diagram of a preferred embodiment of a dc transmission power inversion apparatus provided in the present invention;
fig. 5 is a schematic structural diagram of a preferred embodiment of a connection mode of a direct-current power transmission system to which the present invention is applied.
Detailed Description
In order to clearly understand the technical features, objects and effects of the present invention, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. Other embodiments, which can be derived by those skilled in the art from the embodiments of the present invention without inventive step, shall fall within the scope of the present invention.
In the description of the present invention, it should be understood that the numbers themselves, such as "first", "second", etc., are used only for distinguishing the described objects, do not have a sequential or technical meaning, and cannot be understood as defining or implying the importance of the described objects.
Fig. 1 is a schematic flow chart of a dc transmission power inversion method according to a preferred embodiment of the present invention.
As shown in fig. 1, the method comprises the steps of:
s11: acquiring a power lifting rate and a target power value after power reversal;
s12: reducing the direct current power to a first preset power value according to the power lifting rate;
s13: locking the direct current power transmission system until the direct current power is reduced to 0; when the alternating current filter is locked, the alternating current filter meeting the reverse unlocking requirement is ensured to still be put into operation;
s14: adjusting the connection mode of the direct current transmission line, the direct current pole bus and the direct current neutral bus to avoid polarity inversion of the voltage of the direct current transmission line after power inversion;
s15: reversely unlocking the direct current power transmission system until the direct current power is increased to a second preset power value;
s16: and increasing the direct current power to the target power value according to the power increasing and decreasing speed.
Wherein the method is applied to a direct current transmission system of a direct current transmission line comprising a submarine cable.
Specifically, when the direct current transmission system is required to perform power reversal, an operator firstly issues a power reversal command on an operation interface, inputs a power lifting rate and a target power value after power reversal, obtains the power lifting rate and the target power value, and gradually reduces the direct current power to a first preset power value according to the power lifting rate. And then automatically locking the direct current transmission system to reduce the direct current power to 0, ensuring that the alternating current filter meeting the reverse unlocking requirement is still put into operation, controlling the isolating switches at two ends of the direct current transmission line after the direct current is locked, adjusting a direct current pole bus or a direct current neutral bus connected with the direct current transmission line, and avoiding the voltage polarity inversion of the direct current transmission line after the power inversion. And after the direct-current transmission line is adjusted in place, reversely unlocking the direct-current transmission system, setting the unlocking power to be a second preset power value, so that the original rectifying station is changed into the inverter station, the original inverter station is changed into the rectifying station, and the polarity reversal of the direct-current side voltage of the rectifying station and the inverter station is completed at the moment. And finally, the direct current power is reversely increased to the target power value gradually according to the power increasing and decreasing speed, and the whole process of power reversing is finished.
According to the direct-current transmission power inversion method provided by the embodiment of the invention, after the power is gradually reduced, locking is carried out, an alternating-current filter meeting the requirement of reverse unlocking is ensured to still be put into operation, the connection relation of the direct-current transmission line is adjusted after locking, under the condition that the voltage polarity of the direct-current transmission line is not changed, the direct-current transmission system is reversely unlocked, the direct-current power is increased to a target power value, the inversion control can be automatically and quickly completed on line, the gradual manual operation of operators is not needed, the time consumed by power inversion is reduced, the operation efficiency is improved, the short-time voltage polarity inversion of the submarine cable is avoided by adjusting the wiring mode of the direct-current transmission line, the safety of the submarine cable is protected, and the stability of the direct-current transmission system is improved.
In a preferred embodiment, as shown in fig. 2, the adjusting of the connection mode between the dc transmission line and the dc pole bus and the dc neutral bus specifically includes:
s141: when the operation mode of the direct current transmission system is a bipolar operation mode, a direct current pole bus connected with a direct current transmission line is adjusted in a crossed mode;
s142: when the operation mode of the direct current transmission system is a single-pole ground loop operation mode, stopping operating the current operated direct current transmission line, and putting into the direct current transmission line which is not put into operation before;
s143: and when the operation mode of the direct current transmission system is a single-pole metal loop operation mode, the direct current pole bus and the direct current neutral bus connected with the direct current transmission line are adjusted in a crossed mode.
As an example, fig. 5 shows an application scenario of the present embodiment, where the dc power transmission system includes: the system comprises two side converter stations LCC11, LCC12, LCC21 and LCC22, two side direct current pole 1 buses A1 and A2, two side direct current pole 2 buses B1 and B2, two side direct current neutral buses N1 and N2, two direct current transmission lines L1 and L2, isolating switches Q11-Q16 and Q21-Q26 for realizing line connection adjustment, and when the isolating switches Q11 and Q21 are closed, a line L1 is connected with the two side direct current pole 1 buses A1 and A2; when the isolation switches Q12 and Q22 are closed, a line L1 is connected to the two-side direct-current pole 2 buses B1 and B2; when the disconnectors Q15 and Q25 are closed, the line L1 is connected to the two-sided dc neutral buses N1 and N2. The isolation switches Q11, Q12 and Q15 cannot be closed simultaneously, and the dc transmission system adjusts the bus to which the line is connected by adjusting the isolation knife switch.
Assuming that the rated direct current voltage of the direct current transmission system is +/-200 kV, the bipolar rated direct current power is 400MW, the alternating current systems on two sides are respectively provided with 2 groups of A-type alternating current filters, 2 groups of B-type alternating current filters and 4 groups of C-type alternating current filters, and at least 1 group of alternating current filters and 1 group of B-type alternating current filters are required to be connected when unlocking is carried out. When the direct current transmission is operated, an alternating current filter is required to be put into the direct current transmission to filter out harmonic waves and supplement reactive power, and the more the direct current power is, the more the alternating current filters are put into the direct current transmission.
The discharge time of the ac filter of the dc transmission system is 5 minutes, which means that after the ac filter is cut off, it must wait 5 minutes before it can be put into operation again. During the line power reversal, when the high-voltage DC power is reduced, the redundant AC filters are cut off, and when the power is reversed, the AC filters are put into use again. In the method proposed by the invention, the time for locking the direct current transmission system does not exceed 2 minutes. If all the alternating current filters are cut off in the power reduction and locking processes, when the high-voltage direct-current transmission system is unlocked reversely, all the alternating current filters are not discharged completely to cause unavailability, so that the high-voltage direct-current transmission system cannot be unlocked reversely. To ensure reverse unlatching, the minimum ac filter required for unlatching will remain connected during latching and the other ac filters are cut off. The direct current transmission system is designed to ensure that 1 group of A-type filters and 1 group of B-type filters still put into operation when locked, and other filters are cut off.
In this application scenario, the embodiment is implemented as follows:
(1) when the operation mode of the direct-current transmission system is a bipolar operation mode, the transmission power is 400MW, LCC11 and LCC12 are rectifier stations, LCC21 and LCC22 are inverter stations, the voltage of a bus A1 and a2 of a direct-current pole 1 is +200kV, a bus B1 and a bus B2 of a direct-current pole 2 are rated voltage-200 kV, a line L1 is connected with the bus of the direct-current pole 1 and is +200kV, Q11 and Q21 are closed, a line L2 is connected with the bus of the direct-current pole 2 and is-200 kV, and Q13 and Q23 are closed.
The power inversion method specifically includes: an operator issues a power reversal instruction on an operation interface, and inputs a power lifting rate of 100MW/min and a target power value of-300 MW after power reversal;
the direct current transmission system automatically reduces the direct current power to 10 percent (namely 40MW) of rated direct current power according to the set power lifting rate of 100MW/min, and then automatically locks the direct current transmission system to reduce the direct current power to 0;
when the filter is locked, the 1 group of A-type filters and the 1 group of B-type filters are still put into operation, and other filters are cut off;
after the direct current is locked, the direct current transmission system controls isolation switches at two ends of the transmission lines, and because the current operation mode is a bipolar operation mode, the direct current pole buses connected with the two direct current transmission lines are adjusted in a crossed mode, namely Q11, Q21, Q13 and Q23 are disconnected, Q12, Q22, Q14 and Q24 are closed, a line L1 connected with the direct current pole 1 bus before power reversal is adjusted to be connected with a direct current pole 2 bus, and a line L2 connected with the direct current pole 2 bus before reversal is adjusted to be connected with the direct current pole 1 bus;
when the wiring of the direct-current transmission line is adjusted to be in place, the direct-current transmission system is reversely unlocked, the unlocking power is 10% of the rated direct-current power (namely-40 MW), LCC11 and LCC12 are changed into an inverter station, LCC21 and LCC22 are changed into a rectifier station, the voltage of a bus A1 and a bus A2 of the direct-current pole 1 is changed from +200kV to-200 kV, the voltage of a bus B1 and a bus B2 of the direct-current pole 2 is changed from-200 kV to +200kV, the voltage of a line L1 is still +200kV, and the voltage of a line L2 is still-200 kV;
and finally, gradually and reversely increasing the direct current power according to the set power increasing and decreasing rate of 100MW/min to reach the target power value of-300 MW issued by the operator, and finishing the whole power reversing process.
(2) When the direct-current transmission system is in a direct-current pole 1 unipolar earth return line operation mode, the direct-current pole 2 is shut down, the transmission power is 200MW, the LCC11 rectifier station and the LCC21 inverter station are adopted, the voltage of a bus A1 and a2 of the direct-current pole 1 is rated voltage +200kV, the voltage of a bus B1 and a bus B2 of the direct-current pole 2 is rated voltage-200 kV, a line L1 is connected with the bus of the direct-current pole 1, the voltage is +200kV, the voltage of the bus Q11 and the voltage of the bus Q21 are closed, two sides of the line L2 are both disconnected at intervals, the direct-current transmission system is in a.
The power inversion method specifically includes: and the operator issues a power reversal instruction on the operation interface, and inputs the power lifting rate of 100MW/min and the target power value of-150 MW after power reversal.
The direct current transmission system automatically reduces the direct current power to 10 percent (namely 20MW) of the single-pole rated direct current power according to the set power lifting rate of 100MW/min, and then the direct current transmission system is automatically locked to reduce the direct current power to 0;
when the filter is locked, the 1 group of A-type filters and the 1 group of B-type filters are still put into operation, and other filters are cut off;
after the direct current is locked, the direct current transmission system controls the disconnecting switches at two ends of the transmission line, and because the current operation mode is a single-pole ground loop operation mode, the disconnecting switches at two sides of the current operation direct current transmission line are disconnected to stop the line, and then the disconnecting switches at two sides of the transmission line which is not put into operation before the current operation are closed to connect the direct current pole bus connected to the operation pole, so that the line is put into operation, namely Q11 and Q21 are disconnected, Q14 and Q24 are closed, a line L1 connected with the direct current pole 1 bus before inversion is stopped, and a line L2 which is stopped before inversion is connected with the direct current pole 1 bus;
when the wiring of the direct-current transmission line is adjusted to be in place, the direct-current transmission system is reversely unlocked, the unlocking power is 10% (namely-20 MW) of the unipolar rated direct-current power, the LCC11 is changed into an inverter station, the LCC21 is changed into a rectifier station, the voltage of a bus A1 of the direct-current pole 1 is changed from +200kV to-200 kV, a line L1 is shut down, the voltage is gradually reduced to 0, and the voltage of a line L2 is increased from 0 to-200 kV;
and finally, gradually and reversely increasing the direct current power according to the set power increasing and decreasing rate of 100MW/min to reach the target power value of-150 MW issued by the operator, and finishing the whole power reversing process.
(3) When the direct-current transmission system is in a direct-current pole 1 unipolar metal loop operation mode, the direct-current pole 2 converter station is shut down, the transmission power is 200MW, the LCC11 rectifier station and the LCC21 inverter station are adopted, at the moment, the voltages of a bus A1 and a2 of the direct-current pole 1 are +200kV, buses B1 and B2 of the direct-current pole 2 are 0, the voltages of a direct-current neutral bus N1 and an direct-current neutral bus N2 are 0, a line L1 is connected with a bus of the direct-current pole 1, the voltage is +200kV, Q11 and Q21 are closed, a line L2 is connected with the direct-current neutral buses N1 and N2, and the voltages of 0, and Q16 and Q26 are closed.
The power inversion method specifically includes: and the operator issues a power reversal instruction on the operation interface, and inputs the power lifting rate of 50MW/min and the target power value of-100 MW after power reversal.
The direct current transmission system automatically reduces the direct current power to 10 percent (namely 20MW) of the single-pole rated direct current power according to the set power lifting rate of 50MW/min, and then the direct current transmission system is automatically locked to reduce the direct current power to 0;
when the filter is locked, the 1 group of A-type filters and the 1 group of B-type filters are still put into operation, and other filters are cut off;
after the direct current is locked, the direct current transmission system controls isolation switches at two ends of the transmission line, and because the direct current transmission system is in a single-pole metal loop operation mode at present, the direct current pole bus and the direct current neutral bus connected with the two direct current transmission lines are adjusted in a crossed mode, namely Q11 and Q21 are disconnected, Q15 and Q25 are closed again, a line L1 connected with the direct current pole 1 bus before inversion is connected to the direct current neutral bus, Q16 and Q26 are disconnected, Q14 and Q24 are closed again, and a line L2 connected with the direct current neutral bus before inversion is adjusted to be connected with the direct current pole 1 bus;
when the wiring of the direct-current transmission line is adjusted to be in place, the direct-current transmission system is reversely unlocked, the unlocking power is 10% of the unipolar rated direct-current power (namely-20 MW), the LCC11 is changed into an inverter station, the LCC21 is changed into a rectifier station, the voltage of a bus A1 and A2 of a direct-current pole 1 is changed from +200kV to-200 kV, the voltage of a line L1 is changed from +200kV to 0, and the voltage of a line L2 is changed from 0 to-200 kV;
and finally, reversely increasing the direct current power according to the set power lifting rate of 50MW/min to reach the target power set value-100 MW issued by the operating personnel, and finishing the whole power reversing process.
In a preferred embodiment, the first preset power value is 10% of the rated dc power of the dc power transmission system;
the second preset power value is 10% of the rated direct current power of the direct current transmission system.
It should be understood that all or part of the processes in the above-mentioned dc power transmission power inversion method may be implemented by a computer program, which may be stored in a computer readable storage medium and used by a processor to implement the steps of the above-mentioned dc power transmission power inversion method. 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 computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, in accordance with legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunications signals.
Fig. 3 is a schematic structural diagram of a preferred embodiment of the dc transmission power inverting apparatus according to the present invention, which is capable of implementing all the processes of the dc transmission power inverting method according to any of the above embodiments and achieving corresponding technical effects.
As shown in fig. 3, the apparatus includes:
the data acquisition module 31 is configured to acquire a power increase/decrease rate and a target power value after power inversion;
the first power adjustment module 32 is configured to reduce the dc power to a first preset power value according to the power increase/decrease rate;
a locking module 33, configured to lock the dc power transmission system until the dc power is reduced to 0; when the alternating current filter is locked, the alternating current filter meeting the reverse unlocking requirement is ensured to still be put into operation;
the line adjusting module 34 is configured to adjust a connection manner between the dc transmission line and the dc pole bus and between the dc transmission line and the dc neutral bus, so as to avoid polarity inversion of the dc transmission line voltage after power inversion;
the unlocking module 35 is configured to unlock the dc power transmission system in a reverse direction until the dc power is increased to a second preset power value;
and a second power adjusting module 36, configured to increase the dc power to the target power value according to the power increasing/decreasing rate.
Preferably, the line adjusting module 34 specifically includes:
the first line adjusting unit is used for crossly adjusting a direct-current pole bus connected with a direct-current transmission line when the operation mode of the direct-current transmission system is a bipolar operation mode;
the second line adjusting unit is used for stopping the current running direct current transmission line and putting the direct current transmission line which is not put into operation before when the running mode of the direct current transmission system is a single-pole ground loop running mode;
and the third line adjusting unit is used for crossly adjusting the direct-current pole bus and the direct-current neutral bus connected with the direct-current transmission line when the operation mode of the direct-current transmission system is a single-pole metal loop operation mode.
Preferably, the first preset power value is 10% of the rated direct current power of the direct current transmission system;
the second preset power value is 10% of the rated direct current power of the direct current transmission system.
Fig. 4 is a schematic structural diagram of a preferred embodiment of a dc transmission power reversal device according to the present invention, which can implement all the processes of the dc transmission power reversal method according to any of the above embodiments and achieve corresponding technical effects.
As shown in fig. 4, the apparatus includes a memory 41, a processor 42; wherein the memory 41 stores therein a computer program configured to be executed by the processor 42, and when executed by the processor 42, to implement the dc transmission power inversion method according to any of the embodiments described above.
Illustratively, the computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor 42 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used for describing the execution process of the computer program in the dc transmission power inverting apparatus.
The processor 42 may be a Central Processing Unit (CPU), other general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 41 may be used for storing the computer programs and/or modules, and the processor 42 may implement various functions of the dc power transmission reversal apparatus by running or executing the computer programs and/or modules stored in the memory 41 and calling up data stored in the memory. The memory 41 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 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 (FlashCard), at least one disk storage device, a flash memory device, or other volatile solid state storage device.
It should be noted that the dc power transmission power inverting apparatus includes, but is not limited to, a processor and a memory, and those skilled in the art will understand that the schematic diagram of fig. 4 is merely an example of the dc power transmission power inverting apparatus, and does not constitute a limitation to the dc power transmission power inverting apparatus, and may include more components than those shown in the drawing, or may combine some components, or may be different components.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be noted that, for those skilled in the art, several equivalent obvious modifications and/or equivalent substitutions can be made without departing from the technical principle of the present invention, and these obvious modifications and/or equivalent substitutions should also be regarded as the scope of the present invention.
Claims (8)
1. A direct current transmission power reversal method is applied to a direct current transmission system of a direct current transmission line containing a submarine cable, and is characterized by comprising the following steps:
acquiring a power lifting rate and a target power value after power reversal;
reducing the direct current power to a first preset power value according to the power lifting rate;
locking the direct current power transmission system until the direct current power is reduced to 0; when the alternating current filter is locked, the alternating current filter meeting the reverse unlocking requirement is ensured to still be put into operation;
adjusting the connection mode of the direct current transmission line, the direct current pole bus and the direct current neutral bus to avoid polarity inversion of the voltage of the direct current transmission line after power inversion;
reversely unlocking the direct current power transmission system until the direct current power is increased to a second preset power value;
and increasing the direct current power to the target power value according to the power increasing and decreasing speed.
2. The direct-current transmission power inversion method according to claim 1, wherein the adjusting of the connection mode between the direct-current transmission line and the direct-current pole bus and the direct-current neutral bus specifically includes:
when the operation mode of the direct current transmission system is a bipolar operation mode, a direct current pole bus connected with a direct current transmission line is adjusted in a crossed mode;
when the operation mode of the direct current transmission system is a single-pole ground loop operation mode, stopping operating the current operated direct current transmission line, and putting into the direct current transmission line which is not put into operation before;
and when the operation mode of the direct current transmission system is a single-pole metal loop operation mode, the direct current pole bus and the direct current neutral bus connected with the direct current transmission line are adjusted in a crossed mode.
3. A dc transmission power inversion method according to claim 1 or 2, wherein the first predetermined power value is 10% of the rated dc power of the dc transmission system;
the second preset power value is 10% of the rated direct current power of the direct current transmission system.
4. The utility model provides a direct current transmission power reversal device, is applied to the direct current transmission system who contains the direct current transmission line of submarine cable, its characterized in that includes:
the data acquisition module is used for acquiring the power lifting rate and the target power value after power inversion;
the first power adjusting module is used for reducing the direct current power to a first preset power value according to the power increasing and decreasing rate;
the locking module is used for locking the direct current power transmission system until the direct current power is reduced to 0; when the alternating current filter is locked, the alternating current filter meeting the reverse unlocking requirement is ensured to still be put into operation;
the circuit adjusting module is used for adjusting the connection mode of the direct-current transmission line, the direct-current pole bus and the direct-current neutral bus so as to avoid polarity inversion of the voltage of the direct-current transmission line after power inversion;
the unlocking module is used for reversely unlocking the direct-current power transmission system until the direct-current power is increased to a second preset power value;
and the second power adjusting module is used for increasing the direct current power to the target power value according to the power increasing and decreasing rate.
5. The dc transmission power inverting apparatus according to claim 4, wherein the line adjusting module specifically includes:
the first line adjusting unit is used for crossly adjusting a direct-current pole bus connected with a direct-current transmission line when the operation mode of the direct-current transmission system is a bipolar operation mode;
the second line adjusting unit is used for stopping the current running direct current transmission line and putting the direct current transmission line which is not put into operation before when the running mode of the direct current transmission system is a single-pole ground loop running mode;
and the third line adjusting unit is used for crossly adjusting the direct-current pole bus and the direct-current neutral bus connected with the direct-current transmission line when the operation mode of the direct-current transmission system is a single-pole metal loop operation mode.
6. A DC power transmission power reversal device according to claim 4 or 5, characterized in that the first preset power value is 10% of the rated DC power of the DC power transmission system;
the second preset power value is 10% of the rated direct current power of the direct current transmission system.
7. A direct-current transmission power inversion apparatus characterized by comprising:
a memory for storing a computer program;
a processor for executing the computer program;
wherein the processor, when executing the computer program, implements a direct current transmission power inversion method according to any one of claims 1 to 3.
8. A computer-readable storage medium, characterized in that it stores a computer program which, when executed, implements the direct current transmission power inversion method according to any one of claims 1 to 3.
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Application publication date: 20210629 |