CN110707658A - AC line reclosing method and system for preventing DC continuous commutation failure - Google Patents
AC line reclosing method and system for preventing DC continuous commutation failure Download PDFInfo
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- CN110707658A CN110707658A CN201911004214.5A CN201911004214A CN110707658A CN 110707658 A CN110707658 A CN 110707658A CN 201911004214 A CN201911004214 A CN 201911004214A CN 110707658 A CN110707658 A CN 110707658A
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- circuit breaker
- reclosing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/063—Details concerning the co-operation of many similar arrangements, e.g. in a network
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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 an alternating current circuit reclosing method and system for preventing direct current continuous commutation failure. When communication between the alternating current side reclosing device and the direct current side reclosing device is effective, when a single-phase fault or a multi-phase fault occurs in an alternating current line, a circuit breaker corresponding to the alternating current side is controlled to be tripped, and a circuit breaker corresponding to the direct current side is controlled to be tripped; after preset time delay, controlling the circuit breaker corresponding to the alternating current side to be reclosed; after the circuit breaker corresponding to the alternating current side is reclosed successfully, controlling the circuit breaker corresponding to the direct current side to be reclosed; and after the reclosing of the circuit breaker corresponding to the alternating current side fails, the three-phase circuit breaker on the alternating current side is controlled to trip off and the three-phase circuit breaker on the direct current side is controlled to trip off. The reclosing method and the reclosing system effectively prevent the occurrence of continuous phase change failure of a direct current system and direct current locking accidents caused by the continuous phase change failure, and improve the running stability of the system.
Description
Technical Field
The invention relates to the technical field of power system engineering, in particular to an alternating current line reclosing method and system for preventing direct current continuous phase change failure.
Background
At present, the 'strong direct current and weak alternating current' characteristic of the ultrahigh voltage alternating current and direct current hybrid power grid is prominent in China. The method has the specific expression that the converter device has poor fault impact bearing capacity and does not have turn-off capacity, so that a simple fault of a single alternating current system or an abnormal dynamic process of a single converter station can possibly induce the occurrence of multiple converter stations with phase commutation failure, direct current system unipolar and bipolar locking, alternating current line overload tripping and other cascading faults, the complex coupling characteristic of the extra-high voltage alternating current and direct current hybrid power grid is expressed, instantaneous direct current transmission power interruption is caused, tidal current deterioration of a key section is caused, and great threat is generated on transient stability of the alternating current and direct current hybrid power grid.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an alternating current circuit reclosing method and system for preventing direct current continuous phase commutation failure, and aims to solve the problem of direct current continuous phase commutation failure caused when an alternating current circuit fails in an extra-high voltage alternating current-direct current hybrid power grid.
In a first aspect, the invention provides an alternating current circuit reclosing method for preventing direct current continuous phase commutation failure, which is used for a direct current near-area alternating current circuit in an extra-high voltage alternating current-direct current hybrid network;
an alternating current side reclosing device and a direct current side reclosing device are respectively arranged on two sides of the direct current near-zone alternating current circuit;
the method comprises the following steps:
when communication between the ac-side reclosing device and the dc-side reclosing device is effective,
when the single-phase or multi-phase fault occurs in the alternating-current line, controlling the circuit breaker corresponding to the alternating-current side to trip off, and controlling the circuit breaker corresponding to the direct-current side to trip off;
after preset time delay, controlling the circuit breaker corresponding to the alternating current side to be reclosed;
after the circuit breaker corresponding to the alternating current side is reclosed successfully, controlling the circuit breaker corresponding to the direct current side to be reclosed;
and after the reclosing of the circuit breaker corresponding to the alternating current side fails, the three-phase circuit breaker on the alternating current side is controlled to trip off and the three-phase circuit breaker on the direct current side is controlled to trip off.
Further, the method further comprises:
when the communication between the AC-side reclosing device and the DC-side reclosing device is invalid,
locking the alternating current side reclosing device;
locking the direct current side reclosing device;
and when the single-phase or multi-phase fault occurs in the alternating-current line, controlling the three-phase circuit breaker at the alternating-current side to trip and controlling the three-phase circuit breaker at the direct-current side to trip.
Further, the breaker corresponding to the direct current side is any one of the following four items:
a direct-current side A-phase circuit breaker, a direct-current side B-phase circuit breaker, a direct-current side C-phase circuit breaker and a combination of the direct-current side A-phase circuit breaker and the direct-current side B-phase circuit breaker and the direct-current side C-phase circuit breaker;
the circuit breaker corresponding to the alternating current side is any one of the following four items:
an AC-side A-phase circuit breaker, an AC-side B-phase circuit breaker, an AC-side C-phase circuit breaker, and a combination of an AC-side A-phase circuit breaker and an AC-side B-phase circuit breaker and an AC-side C-phase circuit breaker.
Further, the direct current near-zone alternating current line comprises a first-stage alternating current transmission line of the direct current converter station.
Further, the direct current near-zone alternating current line comprises a power transmission line with a voltage class of more than 110 kV.
In a second aspect, the invention provides an alternating current circuit reclosing system for preventing direct current continuous phase commutation failure, which is used for a direct current near-area alternating current circuit in an extra-high voltage alternating current-direct current hybrid network;
the system comprises:
the alternating current side reclosing device and the direct current side reclosing device are respectively arranged on two sides of the direct current near-zone alternating current line;
the alternating current side protection device and the direct current side protection device are respectively arranged on two sides of the direct current near-zone alternating current circuit;
the alternating current side reclosing device is in communication connection with the direct current side reclosing device;
when communication between the ac-side reclosing device and the dc-side reclosing device is effective,
the alternating-current side protection device is used for controlling a breaker corresponding to the alternating-current side to trip when the single-phase or multi-phase fault of the alternating-current line is detected;
the direct-current side protection device is used for controlling a breaker corresponding to the direct-current side to trip when the single-phase or multi-phase fault of the alternating-current line is detected;
the alternating-current side reclosing device is used for controlling the reclosing of the circuit breaker corresponding to the alternating-current side after the circuit breaker corresponding to the alternating-current side is detected to be tripped; after detecting that the circuit breaker corresponding to the alternating current side is reclosed successfully, generating a reclosing permission signal and sending the reclosing permission signal to the direct current side reclosing device;
accordingly, the number of the first and second electrodes,
the direct current side reclosing device is used for controlling the reclosing of the circuit breaker corresponding to the direct current side according to the received reclosing allowing signal after the circuit breaker corresponding to the direct current side is tripped.
Further, when communication between the AC reclosing device and the DC reclosing device is effective,
the alternating-current side reclosing device is also used for generating a reclosing locking signal and sending the reclosing locking signal to the direct-current side reclosing device after detecting that the circuit breaker corresponding to the alternating-current side is reclosed and failed;
accordingly, the number of the first and second electrodes,
the direct-current side reclosing device is also used for locking the direct-current side reclosing device according to the received reclosing locking signal after the breaker corresponding to the direct-current side is tripped;
the alternating-current side circuit protection device is also used for controlling the three-phase circuit breaker at the alternating-current side to trip after detecting that the circuit breaker corresponding to the alternating-current side is in reclosing failure;
the direct-current side circuit protection device is also used for controlling the three-phase circuit breaker at the direct-current side to trip after detecting that the circuit breaker corresponding to the alternating-current side is in reclosing failure.
Further, when the communication between the AC reclosing device and the DC reclosing device is invalid,
the alternating current side reclosing device is locked;
the direct-current side reclosing device is locked;
the alternating-current side circuit protection device is also used for controlling a three-phase circuit breaker at the alternating-current side to trip when the single-phase or multi-phase fault of the alternating-current line is detected;
the direct current side circuit protection device is also used for controlling the three-phase circuit breaker at the direct current side to trip when the single-phase or multi-phase fault of the alternating current circuit is detected.
Further, the breaker corresponding to the direct current side is any one of the following four items:
a direct-current side A-phase circuit breaker, a direct-current side B-phase circuit breaker, a direct-current side C-phase circuit breaker and a combination of the direct-current side A-phase circuit breaker and the direct-current side B-phase circuit breaker and the direct-current side C-phase circuit breaker;
the circuit breaker corresponding to the alternating current side is any one of the following four items:
an AC-side A-phase circuit breaker, an AC-side B-phase circuit breaker, an AC-side C-phase circuit breaker, and a combination of an AC-side A-phase circuit breaker and an AC-side B-phase circuit breaker and an AC-side C-phase circuit breaker.
Further, the direct-current near-zone alternating-current line comprises a first-stage alternating-current transmission line of the direct-current converter station; or
The direct current near-zone alternating current line comprises a power transmission line with a voltage class of more than 110 kV.
According to the alternating current circuit reclosing method and the alternating current circuit reclosing system for preventing the direct current continuous commutation failure, the reclosing sequence of the direct current side and the alternating current side of the circuit is controlled, so that the actions of closing and tripping of the circuit breaker on the direct current side and the circuit breaker on the alternating current side are coordinated, the circuit breaker on the direct current side is prevented from reclosing in a permanent fault to carry out secondary impact on a direct current system, the occurrence of the continuous commutation failure of the direct current system and the occurrence of direct current blocking accidents caused by the permanent fault are effectively prevented, and the running stability of the system is improved.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a schematic flow diagram of a process according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of the components of the system of the preferred embodiment of the present invention.
Fig. 3 is a schematic diagram of a line composition of an extra-high voltage ac/dc hybrid power grid according to a preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
At present, the automatic reclosing technology is generally applied to a transmission line with the voltage class of more than 110 kV. For example, for transient ground faults, recloser technology can automatically restore line power. However, for a permanent ground fault, the implementation of reclosing will generate secondary impact on the power system, and affect the stability of the system.
Particularly, for permanent faults of a near-area alternating current transmission line of an extra-high voltage direct current converter station, reclosing is carried out on the permanent faults, secondary impact on the converter station is brought, and continuous phase change failure and even vicious accidents of bipolar locking of the converter station are easily caused.
It should be understood that the term "near ac transmission line of the dc converter station" herein includes the first ac transmission line of the dc converter station.
At present, the reclosing strategies on both sides of an alternating current transmission line are as follows:
1) when a single-phase fault occurs in the line, tripping off fault phase circuit breakers on two sides of the line; after fixed time delay, the tripped fault phase circuit breakers on the two sides of the reclosing line; when the circuit is superposed on the permanent fault, the fault phase circuit breakers on the two sides of the line are tripped off again.
2) When a multi-phase fault occurs to the line, tripping off three-phase circuit breakers at two sides of the line; after fixed time delay, the three-phase circuit breakers which are tripped at two sides of the superposed line are switched; when coinciding with a permanent fault, the three-phase circuit breakers on both sides of the line are tripped again.
The reclosing strategy of tripping, reclosing and reopening leads to secondary impact on a direct current system when a permanent fault occurs on a direct current side of a line, continuous commutation failure is caused, and a severe accident of locking the direct current system is caused.
Therefore, in order to overcome the defects of the existing reclosing technology, the embodiment of the invention provides a novel reclosing method, by controlling the reclosing sequence of the direct current side and the alternating current side of the circuit, the actions of closing and tripping of the circuit breaker on the direct current side and the alternating current side are coordinated and matched, the circuit breaker on the direct current side is prevented from reclosing in a permanent fault to carry out secondary impact on a direct current system, the continuous phase commutation failure of the direct current system is effectively prevented from occurring, the direct current blocking accident caused by the continuous phase commutation failure is effectively prevented from occurring, and the running stability of the system is improved.
It should be understood that the length of the direct current near-zone alternating current line of the receiving end of the extra-high voltage alternating current and direct current hybrid power grid is approximately hundreds of kilometers. In general, a reclosing device and a protection device are installed on a dc side and an ac side of a dc near-field ac line, respectively.
As shown in fig. 1, the method for reclosing an ac line to prevent a dc continuous commutation failure according to the embodiment of the present invention includes:
step S100: when communication between the ac-side reclosing device and the dc-side reclosing device is effective,
when the single-phase or multi-phase fault occurs in the alternating-current line, controlling the circuit breaker corresponding to the alternating-current side to trip off, and controlling the circuit breaker corresponding to the direct-current side to trip off;
step S200: after preset time delay, controlling the circuit breaker corresponding to the alternating current side to be reclosed;
step S300: after the circuit breaker corresponding to the alternating current side is reclosed successfully, controlling the circuit breaker corresponding to the direct current side to be reclosed;
step S400: and after the reclosing of the circuit breaker corresponding to the alternating current side fails, the three-phase circuit breaker on the alternating current side is controlled to trip off and the three-phase circuit breaker on the direct current side is controlled to trip off.
After the circuit breaker corresponding to the alternating current side is reclosed successfully, and after the circuit breaker corresponding to the direct current side is reclosed successfully, the line connection is recovered, and the short-time fault is eliminated.
And after the reclosing of the circuit breaker corresponding to the alternating current side fails, the three-phase circuit breaker at the alternating current side trips and the three-phase circuit breaker at the direct current side trips, the line connection is disconnected, and the permanent fault state to be processed is entered.
It should be understood that in the above method, the circuit breaker is in communication connection with the protection device and the reclosing device, respectively; the circuit breaker tripping command is generated by the protection device and sent to the circuit breaker to be executed; a circuit breaker reclosing instruction is generated by the reclosing device and is sent to the circuit breaker to be executed; the action of tripping or closing the circuit breaker is executed by the circuit breaker.
Further, when the communication between the AC reclosing device and the DC reclosing device is invalid,
locking the alternating current side reclosing device;
locking the direct current side reclosing device;
and when the single-phase or multi-phase fault occurs in the alternating-current line, controlling the three-phase circuit breaker at the alternating-current side to trip and controlling the three-phase circuit breaker at the direct-current side to trip.
It should be understood that "blocking the ac-side reclosing means" means that the ac-side reclosing means no longer generates a reclosing command for the circuit breaker tripped on the ac side, nor sends a reclosing command to the tripped circuit breaker.
It should be understood that "blocking the dc-side reclosing means" means that the dc-side reclosing means no longer generates a reclosing command for the dc-side tripped breaker and no longer sends a reclosing command to the tripped breaker.
Further, the breaker corresponding to the direct current side is any one of the following four items:
a direct-current side A-phase circuit breaker, a direct-current side B-phase circuit breaker, a direct-current side C-phase circuit breaker and a combination of the direct-current side A-phase circuit breaker and the direct-current side B-phase circuit breaker and the direct-current side C-phase circuit breaker;
the circuit breaker corresponding to the alternating current side is any one of the following four items:
an AC-side A-phase circuit breaker, an AC-side B-phase circuit breaker, an AC-side C-phase circuit breaker, and a combination of an AC-side A-phase circuit breaker and an AC-side B-phase circuit breaker and an AC-side C-phase circuit breaker.
The reclosing method provided by the embodiment of the invention has the advantages that the execution sequence is set for reclosing actions on two sides of an AC line in a direct current near region, and the reclosing action executed on a direct current side and the reclosing action executed on an AC side are controlled to be coordinated and matched; before the reclosing action is executed, the direct current side needs to receive a reclosing locking or reclosing allowing signal sent by the alternating current side. The reclosing strategy of the tripping-conditionally reclosing prevents the circuit breaker on the direct current side from being tripped again when the permanent fault is reclosed, effectively prevents the occurrence of continuous commutation failure of a direct current system and direct current blocking accidents caused by the failure, and improves the operation stability of the system.
The reclosing action sequence is based on reliable communication between reclosing devices on two sides of the line. If the communication interruption between the reclosing devices on the two sides of the line is detected, the reclosing devices on the two sides of the line are locked; and after the single-phase or multi-phase fault of the line is detected, the three-phase circuit breakers on two sides of the line protection control line are tripped. At this time, the reclosing devices on the two sides of the line are locked, so that the three-phase circuit breakers on the two sides of the line do not execute reclosing action any more after tripping.
That is, when the communication between the dc side and the ac side is interrupted, the control strategy of trip-lockout reclosing is executed, so that the re-trip of the dc side breaker when the dc side breaker is reclosed in a permanent fault can be prevented, the occurrence of the continuous commutation failure of the dc system and the occurrence of the dc lockout accident caused thereby can be effectively prevented, and the operation stability of the system can be improved.
It should be understood that the faults herein are not limited to line-to-ground faults; other faults occurring on the line that can cause the circuit breaker to trip are all applicable to the reclosing method.
It should be understood that each single-phase circuit breaker (specifically, three single-phase circuit breakers respectively arranged on ABC three phases) is tripped under the control of line protection, that is, after the line protection detects a line fault, a tripping instruction is generated and the corresponding circuit breaker is controlled to perform a tripping action;
on the other hand, each single-phase circuit breaker is controlled by a reclosing device to be closed; namely, the reclosing device generates a closing instruction and controls the corresponding breaker to execute a closing action.
And the reclosing device is locked, namely the reclosing device does not generate a reclosing instruction any more and does not control the corresponding breaker to execute a closing action any more.
In addition, the three-phase circuit breakers may be three circuit breakers respectively arranged on the three single-phase lines ABC, and are used for respectively disconnecting the three single-phase lines ABC; or an integrated three-phase circuit breaker respectively arranged on the three single-phase lines ABC for synchronously opening the three single-phase lines ABC.
As shown in fig. 2, an ac line reclosing control system for preventing dc continuous commutation failure according to an embodiment of the present invention includes:
an ac-side reclosing device 20 and a dc-side reclosing device 10 respectively disposed on both sides of the dc near-field ac line;
an ac-side protection device 60 and a dc-side protection device 50 respectively provided on both sides of the dc near-field ac line;
the alternating current side reclosing device is in communication connection with the direct current side reclosing device;
when communication between the ac-side reclosing device and the dc-side reclosing device is effective,
the alternating-current side protection device is used for controlling the circuit breaker 40 corresponding to the alternating-current side to be tripped when the single-phase or multi-phase fault of the alternating-current line is detected;
the direct-current side protection device is used for controlling the circuit breaker 30 corresponding to the direct-current side to be tripped when the single-phase or multi-phase fault of the alternating-current line is detected;
the alternating-current side reclosing device is used for controlling the reclosing of the circuit breaker corresponding to the alternating-current side after the circuit breaker corresponding to the alternating-current side is detected to be tripped; after detecting that the circuit breaker corresponding to the alternating current side is reclosed successfully, generating a reclosing permission signal and sending the reclosing permission signal to the direct current side reclosing device;
accordingly, the number of the first and second electrodes,
the direct current side reclosing device is used for controlling the reclosing of the circuit breaker corresponding to the direct current side according to the received reclosing allowing signal after the circuit breaker corresponding to the direct current side is tripped.
Further, when communication between the AC reclosing device and the DC reclosing device is effective,
the alternating-current side reclosing device is also used for generating a reclosing locking signal and sending the reclosing locking signal to the direct-current side reclosing device after detecting that the circuit breaker corresponding to the alternating-current side is reclosed and failed;
accordingly, the number of the first and second electrodes,
the direct-current side reclosing device is also used for locking the direct-current side reclosing device according to the received reclosing locking signal after the breaker corresponding to the direct-current side is tripped;
the alternating-current side circuit protection device is also used for controlling the three-phase circuit breaker at the alternating-current side to trip after detecting that the circuit breaker corresponding to the alternating-current side is in reclosing failure;
the direct-current side circuit protection device is also used for controlling the three-phase circuit breaker at the direct-current side to trip after detecting that the circuit breaker corresponding to the alternating-current side is in reclosing failure.
Further, when the communication between the AC reclosing device and the DC reclosing device is invalid,
the alternating current side reclosing device is locked;
the direct-current side reclosing device is locked;
the alternating-current side circuit protection device is also used for controlling a three-phase circuit breaker at the alternating-current side to trip when the single-phase or multi-phase fault of the alternating-current line is detected;
the direct current side circuit protection device is also used for controlling the three-phase circuit breaker at the direct current side to trip when the single-phase or multi-phase fault of the alternating current circuit is detected.
The alternating-current side reclosing device, the direct-current side reclosing device, the alternating-current side line protection device and the direct-current side line protection device in the alternating-current line reclosing control system for preventing the direct-current continuous phase change failure respectively execute the steps shown in fig. 1, and have the same technical effects as the alternating-current line reclosing method for preventing the direct-current continuous phase change failure, and the description is omitted here.
The following specifically describes an execution process of the reclosing method according to the embodiment of the present invention, taking the line fault shown in fig. 3 as an example:
1.1), when single-phase fault takes place for the alternating current circuit, circuit protection action jumps out circuit both sides trouble looks circuit breaker:
1.2) when the tripping of the fault phase circuit breaker is detected and the time delay is up to the preset time, reclosing the fault phase circuit breaker with the tripping of the alternating current side of the line;
if the line is detected to have single-phase fault (namely, the line is superposed on the fault) again after reclosing, a reclosing locking signal is sent to the direct current side of the line, and meanwhile, a three-phase circuit breaker on the alternating current side is tripped;
and if the single-phase fault of the alternating-current line is eliminated (namely, the reclosing is successful) after the reclosing, sending a reclosing permission signal to the direct-current side of the line so that the direct-current side executes the reclosing action.
1.3), the direct current side of the line waits for the alternating current side to send a reclosing indicating signal;
after a reclosing locking signal sent by a line alternating current side is received, tripping off a three-phase circuit breaker at a direct current side;
and after receiving a reclosing permission signal sent by the line alternating current side, reclosing the fault phase circuit breaker tripped at the line direct current side.
It should be understood that the above steps 1.1) -1.3) are sequentially performed in sequence, and the sequence of the three steps is unique without other arrangements.
2.1) when the multi-phase fault occurs in the AC line, the line protection acts to trip off the three-phase circuit breakers at two sides of the line;
2.2) when the three-phase circuit breaker is detected to be tripped and the time delay is carried out to the preset time, the three-phase circuit breaker with the tripped alternating current side of the circuit is reclosed;
if the multi-phase fault of the line is detected again after reclosing (namely, the multi-phase fault is superposed on the fault), a reclosing locking signal is sent to the direct current side of the line, and meanwhile, the three-phase circuit breaker on the alternating current side is tripped;
and if the multi-phase fault of the alternating current line is eliminated (namely, the reclosing is successful) after the reclosing, sending a reclosing permission signal to the direct current side of the line so that the direct current side executes the reclosing action.
2.3) waiting for the alternating current side to send a reclosing instruction signal at the direct current side of the line;
after a reclosing locking signal sent by a line alternating current side is received, tripping off a three-phase circuit breaker at a direct current side;
and after receiving a reclosing permission signal sent by the line alternating current side, reclosing the three-phase circuit breaker with the line direct current side tripped.
It should be understood that the above steps 2.1) -2.3) are sequentially performed in sequence, and the sequence of the three steps is unique without other arrangements.
It should be understood that the delay time, i.e., the predetermined time, is determined based on statistical analysis of the characteristics of various faults in the line, such as 0.5s, 0.8s, or 0.6s, for example.
That is, if a single-phase or multi-phase transient fault occurs in the line, the line can be restored to supply power by sequentially performing reclosing operations on the alternating current side and the direct current side;
if the line has a single-phase or multi-phase permanent fault, the three-phase breaker tripping is executed on the alternating current side, and the three-phase breaker tripping is executed on the direct current side, so that the secondary impact of the line direct current side breaker reclosing with the permanent fault on the direct current system is prevented.
And the transient fault or the permanent fault is judged according to whether the reclosing on the alternating current side is successful or not.
It should be noted that, the line ac side sends reclosing permission signals or reclosing locking signals, which are reclosing indication signals, to the line dc side; the line dc side receives reclosing indication signals, such as reclosing enable signals or reclosing lockout signals, from the line ac side, and both require reliable communication connection between the line dc side and the line ac side.
If the communication between the direct current side and the alternating current side of the line is interrupted, the reclosing operations on the two sides of the line are locked; and after the single-phase or multi-phase fault of the line is detected, tripping off the three-phase circuit breakers on two sides of the line. At this time, the reclosing operations on the two sides of the line are locked, so that the reclosing actions of the three-phase circuit breakers on the two sides of the line are not executed any more after the three-phase circuit breakers on the two sides of the line are tripped.
The reclosing method sets action levels for reclosing on two sides of a direct-current near-zone alternating-current line, the action of reclosing on a direct-current side needs to be matched with the action of reclosing on the alternating-current side, and the action of reclosing on the direct-current side needs to receive an alternating-current side reclosing locking or allowing signal. In particular, the amount of the solvent to be used,
1) when the single-phase fault occurs in the AC line, the line protection acts to trip off fault phase circuit breakers on two sides of the line;
the circuit breaker on the line alternating current side firstly recloses in a single phase,
if the fault is superposed, a reclosing locking signal is sent to the direct current side of the line, and the three-phase circuit breaker at the side is tripped simultaneously;
and if the reclosing is successful, sending a reclosing permission signal to the line direct-current side reclosing device.
2) When the single-phase fault occurs in the AC line, the line protection acts to trip off fault phase circuit breakers on two sides of the line;
the line direct-current side reclosing device waits for an alternating-current side reclosing signal;
if a reclosing locking signal is received, tripping off the three-phase circuit breaker on the side;
if the reclosing permission signal is received, the circuit breaker which is tripped at the side is reclosed.
3) When the multi-phase fault occurs to the alternating current circuit, the circuit protection acts to trip off the three-phase circuit breakers on the two sides of the circuit;
the circuit breaker on the line alternating current side firstly recloses in three phases,
if the fault is superposed, a reclosing locking signal is sent to the direct current side of the line, and the three-phase circuit breaker at the side is tripped again;
and if the reclosing is successful, sending a reclosing permission signal to the line direct-current side reclosing device.
4) When the multi-phase fault occurs to the alternating current circuit, the circuit protection acts to trip off the three-phase circuit breakers on the two sides of the circuit;
the line direct-current side reclosing device waits for an alternating-current side reclosing signal;
if a reclosing lock signal is received, the reclosing at the side is locked;
if the reclosing permission signal is received, the three-phase circuit breaker at the side is reclosed.
5) If the communication of the reclosing devices on the two sides of the line is interrupted, the reclosing devices on the two sides of the line are locked,
and directly tripping off the three-phase circuit breaker after the line fault, and not overlapping the brake.
In summary, the reclosing method for the near-area alternating current line of the direct current system provided by the invention can greatly reduce the impact of the permanent fault on the direct current system, prevent the continuous commutation failure of the direct current system and the direct current lockout accident caused by the continuous commutation failure, and improve the operation stability of the system.
The invention has been described above by reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a// the [ device, component, etc ]" are to be interpreted openly as at least one instance of a device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (10)
1. A reclosing method of an alternating current circuit for preventing continuous direct current phase commutation failure is characterized by being used for a direct current near-area alternating current circuit in an extra-high voltage alternating current-direct current hybrid network;
an alternating current side reclosing device and a direct current side reclosing device are respectively arranged on two sides of the direct current near-zone alternating current circuit;
the method comprises the following steps:
when communication between the ac-side reclosing device and the dc-side reclosing device is effective,
when the single-phase or multi-phase fault occurs in the alternating-current line, controlling the circuit breaker corresponding to the alternating-current side to trip off, and controlling the circuit breaker corresponding to the direct-current side to trip off;
after preset time delay, controlling the circuit breaker corresponding to the alternating current side to be reclosed;
after the circuit breaker corresponding to the alternating current side is reclosed successfully, controlling the circuit breaker corresponding to the direct current side to be reclosed;
and after the reclosing of the circuit breaker corresponding to the alternating current side fails, the three-phase circuit breaker on the alternating current side is controlled to trip off and the three-phase circuit breaker on the direct current side is controlled to trip off.
2. The method of claim 1, further comprising:
when the communication between the AC-side reclosing device and the DC-side reclosing device is invalid,
locking the alternating current side reclosing device;
locking the direct current side reclosing device;
and when the single-phase or multi-phase fault occurs in the alternating-current line, controlling the three-phase circuit breaker at the alternating-current side to trip and controlling the three-phase circuit breaker at the direct-current side to trip.
3. The method of claim 1,
the breaker corresponding to the direct current side is any one of the following four items:
a direct-current side A-phase circuit breaker, a direct-current side B-phase circuit breaker, a direct-current side C-phase circuit breaker and a combination of the direct-current side A-phase circuit breaker and the direct-current side B-phase circuit breaker and the direct-current side C-phase circuit breaker;
the circuit breaker corresponding to the alternating current side is any one of the following four items:
an AC-side A-phase circuit breaker, an AC-side B-phase circuit breaker, an AC-side C-phase circuit breaker, and a combination of an AC-side A-phase circuit breaker and an AC-side B-phase circuit breaker and an AC-side C-phase circuit breaker.
4. The method of claim 1,
the direct current near-zone alternating current line comprises a first-stage alternating current transmission line of the direct current converter station.
5. The method of claim 1,
the direct current near-zone alternating current line comprises a power transmission line with a voltage class of more than 110 kV.
6. An alternating current circuit reclosing system for preventing direct current continuous commutation failure is characterized by being used for a direct current near-area alternating current circuit in an extra-high voltage alternating current-direct current hybrid network;
the system comprises:
the alternating current side reclosing device and the direct current side reclosing device are respectively arranged on two sides of the direct current near-zone alternating current line;
the alternating current side protection device and the direct current side protection device are respectively arranged on two sides of the direct current near-zone alternating current circuit;
the alternating current side reclosing device is in communication connection with the direct current side reclosing device;
when communication between the ac-side reclosing device and the dc-side reclosing device is effective,
the alternating-current side protection device is used for controlling a breaker corresponding to the alternating-current side to trip when the single-phase or multi-phase fault of the alternating-current line is detected;
the direct-current side protection device is used for controlling a breaker corresponding to the direct-current side to trip when the single-phase or multi-phase fault of the alternating-current line is detected;
the alternating-current side reclosing device is used for controlling the reclosing of the circuit breaker corresponding to the alternating-current side after the circuit breaker corresponding to the alternating-current side is detected to be tripped; after detecting that the circuit breaker corresponding to the alternating current side is reclosed successfully, generating a reclosing permission signal and sending the reclosing permission signal to the direct current side reclosing device;
accordingly, the number of the first and second electrodes,
the direct current side reclosing device is used for controlling the reclosing of the circuit breaker corresponding to the direct current side according to the received reclosing allowing signal after the circuit breaker corresponding to the direct current side is tripped.
7. The AC line reclosing system according to claim 6,
when communication between the ac-side reclosing device and the dc-side reclosing device is effective,
the alternating-current side reclosing device is also used for generating a reclosing locking signal and sending the reclosing locking signal to the direct-current side reclosing device after detecting that the circuit breaker corresponding to the alternating-current side is reclosed and failed;
accordingly, the number of the first and second electrodes,
the direct-current side reclosing device is also used for locking the direct-current side reclosing device according to the received reclosing locking signal after the breaker corresponding to the direct-current side is tripped;
the alternating-current side circuit protection device is also used for controlling the three-phase circuit breaker at the alternating-current side to trip after detecting that the circuit breaker corresponding to the alternating-current side is in reclosing failure;
the direct-current side circuit protection device is also used for controlling the three-phase circuit breaker at the direct-current side to trip after detecting that the circuit breaker corresponding to the alternating-current side is in reclosing failure.
8. The AC line reclosing system according to claim 6,
when the communication between the AC-side reclosing device and the DC-side reclosing device is invalid,
the alternating current side reclosing device is locked;
the direct-current side reclosing device is locked;
the alternating-current side circuit protection device is also used for controlling a three-phase circuit breaker at the alternating-current side to trip when the single-phase or multi-phase fault of the alternating-current line is detected;
the direct current side circuit protection device is also used for controlling the three-phase circuit breaker at the direct current side to trip when the single-phase or multi-phase fault of the alternating current circuit is detected.
9. The AC line reclosing system according to claim 6,
the breaker corresponding to the direct current side is any one of the following four items: a direct-current side A-phase circuit breaker, a direct-current side B-phase circuit breaker, a direct-current side C-phase circuit breaker and a combination of the direct-current side A-phase circuit breaker and the direct-current side B-phase circuit breaker and the direct-current side C-phase circuit breaker;
the circuit breaker corresponding to the alternating current side is any one of the following four items:
an AC-side A-phase circuit breaker, an AC-side B-phase circuit breaker, an AC-side C-phase circuit breaker, and a combination of an AC-side A-phase circuit breaker and an AC-side B-phase circuit breaker and an AC-side C-phase circuit breaker.
10. The AC line reclosing system according to claim 6,
the direct-current near-zone alternating-current line comprises a first-stage alternating-current transmission line of a direct-current converter station; or
The direct current near-zone alternating current line comprises a power transmission line with a voltage class of more than 110 kV.
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| CN201911004214.5A CN110707658A (en) | 2019-10-18 | 2019-10-18 | AC line reclosing method and system for preventing DC continuous commutation failure |
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| CN201911004214.5A CN110707658A (en) | 2019-10-18 | 2019-10-18 | AC line reclosing method and system for preventing DC continuous commutation failure |
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| CN112886532A (en) * | 2021-01-15 | 2021-06-01 | 国网河南省电力公司电力科学研究院 | Power transmission line self-adaptive reclosing method and system based on multi-source information |
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