CN110556794A - Bus bar protection configuration method of multi-end hybrid direct current system - Google Patents
Bus bar protection configuration method of multi-end hybrid direct current system Download PDFInfo
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- CN110556794A CN110556794A CN201910866167.9A CN201910866167A CN110556794A CN 110556794 A CN110556794 A CN 110556794A CN 201910866167 A CN201910866167 A CN 201910866167A CN 110556794 A CN110556794 A CN 110556794A
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- protection
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- line
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Classifications
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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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
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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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- 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
- H02H7/28—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 meshed systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
the invention discloses a bus bar protection configuration method of a multi-end hybrid direct current system, which comprises the steps of combining bus bar protection and line protection of two direct current lines together to form a screen, integrating the screen into a set of protection device, sharing a merging unit, wherein the line and bus bar protection adopts triple configuration, two sets of independent three-to-two devices are arranged, the three sets of lines and bus bar protection respectively send action signals to the two sets of three-to-two devices and two sets of control systems, and when IDL 1, IDL 2 and IDL 3 data verification sent by the merging unit is effective and delay t1 is delayed, no fault causes protection function locking, line and bus bar protection soft pressing plate is put in, and the line and bus bar protection hard pressing plate is put in simultaneously, the protection function of the set of lines and the bus bar is delayed t2 put in.
Description
Technical Field
The invention relates to a bus bar protection configuration method of a multi-end hybrid direct current system.
Background
In recent years, a high-voltage direct-current transmission (LCC-HVDC) technology based on a grid commutation converter is gradually mature, low in cost and low in loss, but due to the dependence of the high-voltage direct-current transmission (LCC-HVDC) technology on a receiving-end grid, commutation failure exists, the short-circuit capacity of a receiving-end grid system can be increased, and a large grid risk exists under the condition of multi-direct-current feed-in. The appearance of a high-voltage direct-current transmission (MMC-HVDC) system based on a modular multilevel converter has been widely applied to large-scale wind power plant grid connection, power grid interconnection, multi-terminal direct-current transmission and the like by virtue of the advantages of modularization, low harmonic content, low loss and the like, and the Modular Multilevel Converter (MMC) has become a main development trend of a hybrid direct-current transmission technology. At present, a plurality of flexible direct current projects are put into operation at home and abroad, such as domestic Luxi back-to-back direct current, south Australia three-terminal flexible direct current demonstration project, American Trans Bay Cable project and the like, the flexible direct current projects which are put into operation and based on the MMC scheme all adopt a half-bridge sub-module-based modular multilevel converter scheme (HBMMC), but the self-clearing of direct current side faults cannot be realized. High-voltage direct-current transmission system based on full-bridge sub-module based modular blocked converter (FBMMC) can be rapidly locked or output negative pressure to cut off direct current fault current after direct current line fault occurs, and an alternating current side circuit breaker does not need to be tripped, and the system can rapidly recover to operate after the fault is cut off, so that the FBMMC is more suitable for a hybrid direct-current transmission system based on a long-distance overhead line. In particular, in recent years, flexible direct-current transmission technology is rapidly developed, and the development stage of extra-high voltage high-capacity flexible direct-current transmission is already advanced.
In order to enable the converter to have direct current fault clearing capacity and reduce the running loss of a power device, a bridge arm adopts a mixed type converter based on a half-bridge submodule and a full-bridge submodule, and meanwhile, the mixed type converter can be used for constructing a multi-terminal direct current transmission system due to economy and superior control performance, so that the flexibility of the direct current transmission system is greatly improved, and the direct current transmission system has wide application prospect. In a multi-terminal hybrid direct-current transmission system, taking a three-terminal direct-current transmission system as an example, a bus bar is generally arranged at a line intermediate station and used for collecting and distributing direct-current transmission power, and a bus bar area puts high requirements on the configuration of bus bar protection due to numerous voltage and current measuring points and various operation modes.
therefore, it is necessary to deeply research a configuration method for protecting a multi-terminal hybrid dc bus bar and provide a reference for practical engineering design.
Disclosure of Invention
Aiming at the problems, the invention provides a bus bar protection configuration method suitable for a multi-end hybrid direct current system, which combines bus bar protection and line protection together to form a screen, adopts triple configuration, and shares a two-out-of-three device with the bus bar protection and the line protection, thereby reducing the number of remote modules required by current measuring points, avoiding the increase of current measuring devices caused by the insufficiency of the remote modules of the measuring points, reducing the number of screen cabinets and greatly increasing the reliability of protection.
In order to achieve the purpose, the technical scheme of the invention is as follows:
A bus bar protection configuration method of a multi-end hybrid direct current system comprises the following steps:
(1) the multi-terminal hybrid direct-current system comprises a sending-end converter station, a receiving-end converter station I, a receiving-end converter station II, a bus bar, a direct-current transmission line I, a bus connecting line and a direct-current transmission line II;
The sending end converter station is connected with a bus bar through a first direct current transmission line, the bus bar is connected with a first receiving end converter station through a bus connecting line, and the bus bar is also connected with a second receiving end converter station through a second direct current transmission line;
The direct current transmission line I is provided with a knife isolating Q1, the confluence connecting line is provided with a knife isolating Q2, and the direct current transmission line II is provided with a knife isolating Q3;
The bus protection collects three current quantities of IDL 1, IDL 2 and IDL 3 and bus voltage UDL BUS;
the criterion of the protection of the BUS bar is | IDL 1 -IDL 2 -IDL 3 | > k 1 | MAX (IDL 1 2 3) | & | UDL _ BUS | < k 2 | U N;
U N is the rated voltage of the bus bar, and k 1 and k 2 are proportionality coefficients;
IDL 1 is a DC transmission line current, when the isolating knife Q1 is separated, the program automatically forces the value to be equal to 0;
IDL 2 is the busbar link current, which the program automatically forces equal to 0 when the knife Q2 is opened;
IDL 3 is the second current of DC transmission line, when the isolating knife Q3 is separated, the program will force its value equal to 0 automatically;
(2) the bus protection and the line protection of two DC transmission lines are combined into a set of protection device, and are integrated in a set of protection device, and share a measurement merging unit, IDL 1, IDL 2, IDL 3 and UDL BUS sent by a field measurement device are respectively sent to the merging unit through optical fibers, and then sent to the line and bus protection device through the merging unit, and are used for line protection logic and bus protection logic operation;
(3) the circuit and the bus bar protection adopt triple configuration, two sets of independent two-out-of-three devices are arranged, the three sets of circuit and bus bar protection respectively send action signals to the two sets of two-out-of-three devices, logic judgment is carried out in a two-out-of-three host, and two tripping coils of the alternating current circuit breaker can be tripped at the outlet of each set of the two-out-of-three host; meanwhile, the protection of the three sets of circuits and the bus bar also respectively sends action signals to two sets of control systems, each set of control host is provided with independent two-out-of-three logic, and when the two-out-of-three logic is met, the current converter and the tripping alternating current circuit breaker are locked by the outlet of the control system on duty;
(4) The protection switching logic of the line and the bus bar is that when IDL 1, IDL 2 and IDL 3 data sent by the merging unit are checked to be effective and delay t1, the protection function is locked due to no fault, the protection soft pressing plate of the line and the bus bar is switched in, and the protection hard pressing plate of the line and the bus bar is switched in simultaneously, the protection function of the line and the bus bar is delayed for t2 to be switched in.
Further, in the step (2), the protection device comprises a power panel, a protection panel, a management panel and a communication panel which are duplicated, and vacant sites of two boards are arranged between the boards in the device, so that the device is convenient to dissipate heat, and the stability of the protection device is improved.
furthermore, in the step (2), each protection adopts a configuration principle of different measuring devices, channels, power supplies and outlets, any set of protection exits from operation without influencing power transmission of a direct current system, when a fault of a certain measuring point is monitored by the protection, only the protection function related to the measuring point exits, and the protection device continues to operate; when a certain set of protection monitors that the device has a fault, all protection functions are locked, and the protection logic is changed into one out of two; when two sets of protection devices are quitted due to faults, the protection logic is changed into one to one; when all the three sets of protection systems quit operation due to reasons, the direct current pole is locked and stopped.
Furthermore, in the step (4), each set of line and bus protection is only configured with one protection function hard pressing plate, two line protection and bus protection functions in the device are associated, when the function hard pressing plate is withdrawn, the set of protection functions is withdrawn, and the line protection and the bus protection are reduced to two-to-one logic.
Compared with the prior art, the invention has the beneficial effects that:
1. the bus bar protection and the line protection of the two direct current transmission lines are combined together and integrated in one set of protection device, so that the number of current and voltage measuring points and the number of protection screen cabinets can be reduced, and the economical efficiency is good.
2. Two sets of completely independent two-out-of-three logics are adopted, on one hand, two sets of independent two-out-of-three devices are arranged, and two tripping coils of the alternating current circuit breaker can be tripped at the outlet of each two-out-of-three host; on the other hand, the three sets of lines and the protection of the bus bar also respectively send action signals to the two sets of control systems, each set of control host is provided with independent two-out-of-three logic, and the control system on duty is used for locking the current converter and the tripping AC circuit breaker, so that even if the two sets of two-out-of-three hosts are in failure, the current converter and the tripping AC circuit breaker can be normally locked, and the reliability is high.
3. Each set of protection device adopts a hard pressing plate with a protection function, is related to two lines for protection and bus protection, is convenient to separate during fault processing, reduces the risk of protection misoperation in the operation process, and does not influence the reliability of protection.
Drawings
Fig. 1 is a wiring diagram of a multi-terminal hybrid dc transmission system of the present invention;
FIG. 2 is a block diagram of the circuit and bus bar protection device of the present invention;
FIG. 3 is a two out of three logic diagram of the line and bus protection of the present invention;
Fig. 4 is a logic diagram of the protection switching of the line and bus bar according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
A bus bar protection configuration method of a multi-end hybrid direct current system comprises the following steps:
(1) fig. 1 shows a connection mode and a test point of a multi-terminal hybrid dc system, a sending-end converter station is a power grid commutation converter (LCC), i.e. a current source converter, a receiving-end converter station i and a receiving-end converter station ii are both Modular Multilevel Converters (MMC), i.e. a voltage source converter, a converter station 2 is an intermediate station, a bus bar, a bus connection line and a receiving-end converter station are together arranged in one station, the sending-end converter station is connected with the bus bar through a dc transmission line i, the bus bar is connected to the receiving-end converter station i and the receiving-end converter station ii through the bus connection line and the dc transmission line ii, respectively, the bus bar protects and collects three current quantities of IDL 1, IDL 2 and IDL 3 and a bus voltage UDL BUS, the protection ranges of the bus bar and the bus connection line between three current measuring devices IDL 1, IDL 2 and IDL 3, the polarities of the three current measuring devices IDL 1, IDL 2 and IDL 3 are all as shown in the direction in fig. 1, and the direction from the sending end to the receiving.
the criterion of the BUS protection is | IDL 1 -IDL 2 -IDL 3 | > k 1 | MAX (IDL 1 2 3) | & | UDL _ BUS | < k 2 | U N.
U N is the rated voltage of the bus bar, and k 1 and k 2 are proportionality coefficients.
IDL 1 A current is sent to the DC line, and when the knife separator Q1 is opened, the program automatically forces its value equal to 0.
IDL 2 bus connector current, the program automatically forces its value equal to 0 when the knife Q2 is opened.
IDL 3 direct current transmission line two current, when the knife Q3 is separated, the program automatically forces its value equal to 0.
The positions of the disconnecting links are correlated in the bus bar protection criterion, the operation mode is automatically judged, and the protection can be prevented from misoperation when a flow injection test is carried out on a relevant analog measurement point after a certain station is quitted from operation. Therefore, the protection logic of the bus bar changes along with the change of the operation mode, so that the flexibility of the operation mode is ensured, and the accuracy of the current measurement and the reliability of protection are also ensured.
(2) As shown in fig. 2, IDL 1, IDL 2, IDL 3 and UDL BUS sent from a current measuring device on site are respectively sent to the same merging unit through optical fibers and then sent to the line and the bus protection device through the merging unit for line protection logic and bus protection logic operation.
1 2 3 BUSThe protection device comprises a power panel, a protection panel, a management panel and a communication panel which are duplicated, vacant sites of two board cards are arranged between the board cards in the device at intervals, heat dissipation of the device is facilitated, and stability of the protection device is improved.
(3) As shown in fig. 3, the line and bus protection adopts a triple configuration, two sets of independent two-out-of-three devices are arranged, protection action signals of each set of line and bus are respectively sent to two sets of two-out-of-three hosts, logic judgment is carried out in the two-out-of-three hosts, and two tripping coils of the alternating current circuit breaker can be tripped at the outlet of each set of two-out-of-three hosts; meanwhile, the three sets of circuits and the protection of the bus bar also respectively send action signals to two sets of control systems, each set of control host is provided with independent two-out-of-three logic, and when the two-out-of-three logic is met, the current converter and the tripping alternating current circuit breaker are locked by the control system outlet on duty.
Each protection adopts the configuration principle of different measuring devices, channels, power supplies and outlets, and any one set of protection exits from operation without influencing the power transmission of the direct current system. When the protection monitors that a certain measuring point has a fault, only the protection function related to the measuring point is quitted, and the protection device continues to operate; when a certain set of protection monitors that the device has a fault, all protection functions are locked, and the protection logic is changed into one out of two; when two sets of protection devices are quitted due to faults, the protection logic is changed into one to one; when all the three sets of protection systems quit operation due to reasons, the direct current pole is locked and stopped.
(4) the protection input logic of the circuit and the bus bar is shown in fig. 4, when the data verification of IDL 1, IDL 2 and IDL 3 sent by the merging unit is effective, the delay time t1 is prolonged, the protection function is locked due to no fault, the protection soft pressing plate of the circuit and the bus bar is input, and the input of the protection hard pressing plate of the circuit and the bus bar is simultaneously met, the protection function of the set of circuit and the bus bar is delayed until t2 is input, each set of circuit and the bus bar protection is only provided with one protection function hard pressing plate, the protection function of two circuits and the protection function of the bus bar in the device are related, when the protection hard pressing plate of the two circuits is withdrawn, the protection function and the protection of the bus bar are reduced to one logic, thus, when a certain measuring point is abnormal or a certain channel fault and a certain board card fault need to be checked and processed, the protection hard pressing plate of the set is withdrawn, the protection function is completely isolated, the device is convenient for maintenance and the risk of protection misoperation caused in the operation process is reduced, the safety of online maintenance is greatly improved, and the reliability of the single set of the.
the above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (4)
1. A bus bar protection configuration method of a multi-end hybrid direct current system is characterized by comprising the following steps: the method comprises the following steps:
(1) The multi-terminal hybrid direct-current system comprises a sending-end converter station, a receiving-end converter station I, a receiving-end converter station II, a bus bar, a direct-current transmission line I, a bus connecting line and a direct-current transmission line II;
the sending end converter station is connected with a bus bar through a first direct current transmission line, the bus bar is connected with a first receiving end converter station through a bus connecting line, and the bus bar is also connected with a second receiving end converter station through a second direct current transmission line;
the direct current transmission line I is provided with a knife isolating Q1, the confluence connecting line is provided with a knife isolating Q2, and the direct current transmission line II is provided with a knife isolating Q3;
The bus protection collects three current quantities of IDL 1, IDL 2 and IDL 3 and bus voltage UDL BUS;
The criterion of the protection of the BUS bar is | IDL 1 -IDL 2 -IDL 3 | > k 1 | MAX (IDL 1 2 3) | & | UDL _ BUS | < k 2 | U N;
U N is the rated voltage of the bus bar, and k 1 and k 2 are proportionality coefficients;
IDL 1 is a DC transmission line current, when the isolating knife Q1 is separated, the program automatically forces the value to be equal to 0;
IDL 2 is the busbar link current, which the program automatically forces equal to 0 when the knife Q2 is opened;
IDL 3 is the second current of DC transmission line, when the isolating knife Q3 is separated, the program will force its value equal to 0 automatically;
(2) the bus protection and the line protection of two DC transmission lines are combined into a set of protection device, and are integrated in a set of protection device, and share a measurement merging unit, IDL 1, IDL 2, IDL 3 and UDL BUS sent by a field measurement device are respectively sent to the merging unit through optical fibers, and then sent to the line and bus protection device through the merging unit, and are used for line protection logic and bus protection logic operation;
(3) the circuit and the bus bar protection adopt triple configuration, two sets of independent two-out-of-three devices are arranged, the three sets of circuit and bus bar protection respectively send action signals to the two sets of two-out-of-three devices, logic judgment is carried out in a two-out-of-three host, and two tripping coils of the alternating current circuit breaker can be tripped at the outlet of each set of the two-out-of-three host; meanwhile, the protection of the three sets of circuits and the bus bar also respectively sends action signals to two sets of control systems, each set of control host is provided with independent two-out-of-three logic, and when the two-out-of-three logic is met, the current converter and the tripping alternating current circuit breaker are locked by the outlet of the control system on duty;
(4) the protection switching logic of the line and the bus bar is that when IDL 1, IDL 2 and IDL 3 data sent by the merging unit are checked to be effective and delay t1, the protection function is locked due to no fault, the protection soft pressing plate of the line and the bus bar is switched in, and the protection hard pressing plate of the line and the bus bar is switched in simultaneously, the protection function of the line and the bus bar is delayed for t2 to be switched in.
2. The bus bar protection configuration method of the multi-terminal hybrid direct current system according to claim 1, wherein: in the step (2), the protection device comprises a power panel, a protection panel, a management panel and a communication panel which are duplicated, and the vacant sites of the two boards are separated between the boards in the device, so that the device is convenient to dissipate heat, and the stability of the protection device is improved.
3. the bus bar protection configuration method of the multi-terminal hybrid direct current system according to claim 1, wherein: in the step (3), each protection adopts the configuration principle of different measuring devices, channels, power supplies and outlets, any set of protection exits from operation without influencing the power transmission of the direct current system, and when the protection monitors that a certain measuring point has a fault, only the protection function related to the measuring point exits, and the protection device continues to operate; when a certain set of protection monitors that the device has a fault, all protection functions are locked, and the protection logic is changed into one out of two; when two sets of protection devices are quitted due to faults, the protection logic is changed into one to one; when all the three sets of protection systems quit operation due to reasons, the direct current pole is locked and stopped.
4. The bus bar protection configuration method of the multi-terminal hybrid direct current system according to claim 1, wherein: in the step (4), each set of line and bus protection is only configured with one protection function hard pressing plate, two line protection and bus protection functions in the device are related, when the function hard pressing plate is withdrawn, the set of protection functions is withdrawn, and the line protection and the bus protection are reduced to two-to-one logic.
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| CN201910866167.9A CN110556794B (en) | 2019-09-12 | 2019-09-12 | Bus bar protection configuration method of multi-end hybrid direct current system |
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| CN201910866167.9A CN110556794B (en) | 2019-09-12 | 2019-09-12 | Bus bar protection configuration method of multi-end hybrid direct current system |
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| CN113224734A (en) * | 2021-05-06 | 2021-08-06 | 国网福建省电力有限公司福州供电公司 | Method and terminal for realizing line auxiliary protection |
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| CN113224734A (en) * | 2021-05-06 | 2021-08-06 | 国网福建省电力有限公司福州供电公司 | Method and terminal for realizing line auxiliary protection |
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