CN112531661B - Station domain failure protection method and system based on switching value signals - Google Patents
Station domain failure protection method and system based on switching value signals Download PDFInfo
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- 230000000903 blocking effect Effects 0.000 description 5
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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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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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
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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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
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Abstract
The invention discloses a station domain failure protection method and system based on switching value signals, and belongs to the field of relay protection of power systems. The method comprises the following steps: according to the action state of the protection, the state of the starting element and the switching value signals of adjacent protection, the action logic combination and the secondary loop switching value signals are utilized to realize a failure protection function which is matched step by step according to the adjacent relation for various multi-port protected equipment in a station domain. The invention aims at the station domain protection of the alternating current and direct current power system, does not need complex setting, and can solve the problem that the main protection can not rapidly remove the fault due to the failure of adjacent circuit breakers, the failure of adjacent protection including the voltage loss of adjacent protection control equipment and the like related to the far backup protection.
Description
Technical Field
The invention belongs to the field of relay protection of power systems, and particularly relates to a station domain failure protection method and system based on switching value signals.
Background
The relay protection is a first defense line for ensuring the safety of a large power grid. If the protection device can not act correctly, quickly and reliably when a fault occurs, the accident is easily expanded, and even large-area power failure is caused. In recent years, the power grid is continuously enlarged and complicated, and the smart power grid is built, so that higher requirements are put on relay protection, particularly backup protection of a power system.
When the main protection fails or the breaker fails, the fault needs to be reliably cut off by backup protection. The traditional backup protection generally adopts stage type distance protection or zero sequence overcurrent protection, and has the defects of complex setting, difficult matching, slow action speed, poor selectivity, incapability of adapting to the change of a complex operation mode and the like. The traditional failure protection is used as near backup protection, and the problem of refusal action caused by secondary equipment faults such as protection voltage loss and the like cannot be solved. Many researchers propose wide area protection as a backup protection method, but the problems that measurement information needs to be synchronized, information transmission has delay, the communication is highly dependent, the reliability is not high and the like exist.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a station domain failure protection method and a station domain failure protection system based on switching value signals, which do not depend on a communication master station and setting and aim to solve the problem that main protection cannot reliably remove faults caused by adjacent breaker failures, adjacent protection failures including voltage loss of adjacent protection control equipment and the like related to remote backup protection.
In order to achieve the above object, the present invention provides a station domain failure protection method based on a switching value signal, which includes the following steps:
s1, acquiring a starting element state of the protection device, and sending a switching value signal to an adjacent protection device according to the starting element state, wherein the switching value signal is used for locking the adjacent protection device;
s2, acquiring a main protection starting state of the protection device, judging whether main protection of the protection device should act, if so, sending a tripping instruction to a circuit breaker of a protection area where the protection device is located by the protection device, stopping sending a switching value signal to an adjacent protection device, and if not, entering a step S3;
and S3, acquiring switching value signals sent by adjacent protection devices and fault characteristic information of a protection area where the adjacent protection devices are located, judging whether the protection device is to be used as a failure protection action or not by combining the starting element state, the main protection starting state and the main protection action state of the protection device, if the protection device is to be used as the failure protection action, sending a tripping instruction to a circuit breaker of the protection area, stopping sending the switching value signals to the adjacent protection devices, realizing station area failure protection, and if not, resetting the protection device after the starting element returns.
Further, the main protection device covers 100% of the protected area, and all protection devices and adjacent protection devices exchange switching value signals through a secondary loop.
Furthermore, all protection devices are provided with starting elements responding to system disturbance, and for an alternating current system, the action criterion can be various typical protection starting elements, such as a starting element based on phase current sudden change, a negative sequence starting element, a zero sequence starting element, a differential current starting element and the like; for a dc system, the startup element startup logic may be QD = (Δ i > k) 1 I N )∪(i＞k 2 I N ) Where QD is the actuating signal of the actuating element, Δ i is the current abrupt change, k 1 And k 2 As a reliability factor, I N Is the rated current. The protection device is started when any one of two criteria is met.
Further, the main protection device may be a differential protection device using the principle of rate braking, the actuation criterion being
Where j is the number of differential protection ports,
the current vector flowing into the port n, K is the differential braking coefficient, and the value is according to different protection objects and the differential current unevenness thereofThe balance condition is set, taking the protection object as a bus as an example, generally K can be about 0.4.
Further, the fault characteristics are not disappeared, the fault current is always present for the alternating current power system, and any one of the formulas (1) to (3) is satisfied; when any one of (4) to (6) is satisfied with respect to the dc power system, it is determined that the fault feature is not disappeared.
I + ＞I +.set ∩U + <U +.set (4)
I - ＞I -.set ∩U - <U -.set (5)
I ± ＞I ±.set ∩U ± <U ±.set (6)
Wherein,
is the module value of the A, B and C three-phase current flowing at intervals in the protected range, I 0 、I 2 Zero sequence, negative sequence current, I, flowing at intervals for the protected area + 、U + 、I - 、U - 、I ± 、U ± The current and voltage of the direct current anode, the cathode and the interelectrode are respectively.
I 0.set 、I 2.set 、I +.set 、U +.set 、I -.set 、U -.set 、I ±.set 、U ±.set Are respectively provided withIs a setting value.
Further, when a fault occurs in the protection area where the protection device is located, the starting element responds to the fault disturbance to start, and sends a switching value signal to other protection devices adjacent to the protection device; when the protection device judges that the inside of the protection device has a fault, a trip command is sent out, and meanwhile, the sending of a switching value signal is stopped, and the adjacent protection devices do not receive the switching value signal sent by the protection device any more; after the fault is removed, each protection device starts the element to return, and the protection devices are successively reset.
Further, in step S3, when a fault occurs in the protection area where the adjacent protection device is located, the adjacent protection device sends a trip command and stops sending the switching value signal; if the adjacent protection device fails, the fault can not be removed all the time, and the switching value signal can not be sent to the protection device all the time, after the protection device is started, the external fault is judged, and the switching value signal sent by the failed protection device can not be received all the time, a time delay is started, the time delay is timed, whether the fault characteristic of the branch circuit connected with the adjacent protection device disappears or not is continuously monitored, and if the fault characteristic does not disappear, the set time T is passed set After the delay, the protection device sends out a tripping command and stops sending out a switching value signal, each protection device starts the element to return after the fault is removed, and the protection devices are successively reset.
Further, in step S3, when a fault occurs in the protection area where the adjacent protection device is located, the adjacent protection device sends a trip command and stops sending the switching value signal; if the corresponding circuit breaker fails, the fault can not be removed all the time, the protection device receives the switching value signal sent by the adjacent protection device after being started, the adjacent protection device does not receive the switching value signal after acting, the protection device judges that the external fault exists, starts time delay and timing, continuously monitors whether the fault characteristic of a branch circuit connected with the adjacent protection device disappears or not, and if the fault characteristic does not disappear, the fault characteristic is subjected to setting for a time T set After the delay, the protection device sends out a tripping command and stops sending out a switching value signal, each protection device starts an element to return after the fault is removed, and the protection is successively reset.
In another aspect, the present invention provides a station domain fault protection system based on a switching value signal, including: a computer-readable storage medium and a processor;
the computer-readable storage medium is used for storing executable instructions;
the processor is used for reading executable instructions stored in the computer-readable storage medium and executing the station domain failure protection method based on the switching value signal.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the station domain failure protection method based on the switching value signals can effectively solve the technical problem that main protection cannot reliably remove faults caused by breaker failure, protection failure and the like, and can ensure selectivity and minimize the power loss range.
2. The station domain failure protection method based on the switching value signals does not need complex setting and mainly depends on logic to realize step-by-step coordination.
3. The station domain failure protection method based on the switching value signals does not depend on communication, only needs to obtain the state information of adjacent protection devices, and is simple and reliable.
Drawings
Fig. 1 is a schematic diagram of a substation system with a single bus segment structure to which a switching value signal-based station domain failure protection method is applied according to an embodiment of the present invention;
fig. 2 is a protection action logic diagram of a station domain failure protection method based on a switching value signal according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention. In addition, the technical features involved in the respective embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
All protection devices are equipped with an actuating element responsive to system disturbances and primary protection covering 100% of the area to be protected. All the protection and adjacent protection in the station domain range are mutually switched on and off through a secondary loop to block signals. When a fault occurs in the main protection area, the corresponding starting element acts and sends a locking signal to the adjacent protection, and when the main protection acts rapidly and sends a tripping command, the signal sending is stopped.
Specifically, the system shown in fig. 1 may be divided into eight protection zones P1 to P8. Wherein, P1 and P5 are transformer protection zones, P2 and P6 are bus protection zones, and the rest are outlet protection zones. Taking protection P2 as an example, protection P2 and protections P1, P3, P4 and P6 all exchange switching values through a secondary loop.
The invention provides a station domain failure protection method based on switching value signals, which specifically comprises the following steps as shown in fig. 2:
s1, acquiring a starting element state of the protection device, and sending a switching value signal to an adjacent protection device according to the starting element state, wherein the switching value signal is used for locking the adjacent protection device.
S2, acquiring a main protection starting state of the protection device, judging whether the main protection of the protection device needs to act, if so, sending a tripping command to a circuit breaker of a protection area where the protection device is located by the protection device, stopping sending a switching value signal to an adjacent protection device, and if not, entering the step S3.
Taking the case of a failure in the P2 zone as an example, the start element of the P2 protection zone senses the failure and starts QD =1, and the protection of the other protection zones senses the failure and then starts successively. P2 protection and neighbor protection
A blocking signal is sent to the respective adjacent protection, and the delay timer is started respectively to continuously monitor whether the fault current disappears. When the P2 main protection determines that an internal fault occurs, the main protection starts MP _ QD =1, and the main protection action MP _ OP =QD ≧ MP _ QD =1, issue a trip instruction and remove the fault. Subsequently, the protection activating elements are returned and the protections are successively restored.
S3, acquiring switching value signals sent by adjacent protection devices and fault characteristic information of a protection area where the adjacent protection devices are located, judging whether the protection device is used as a failure protection action or not by combining the starting element state, the main protection starting state and the main protection action state of the protection device, if the protection device is used as the failure protection action, sending a tripping command to a circuit breaker of the protection area, stopping sending the switching value signals to the adjacent protection devices, realizing station domain failure protection, and if not, resetting the protection device after the starting element returns.
Specifically, for the case of protection failure, a failure occurs in the P2 region and the P2 protection fails as an example. The failed protection P2 cannot send a blocking signal to the adjacent protection. The protection P1 senses a fault-followed trigger element action QD =1, the main protection action MP _ OP =0, the fault characteristic does not disappear FLT _ notify =1, and the lockout signal RES _ SIG =0 sent by the protection P2 is not received all the time, and the setting time T elapses set After the delay, the protection P2 is judged to be out of order, and the out-of-order protection is started
The protection P1 acts on the circuit breakers Brk1 and Brk8 to selectively remove the fault, namely, the function of failure protection is realized. Similarly, protection P3 operates on circuit breaker Brk2, protection P4 operates on circuit breaker Brk3, and protection P6 operates on circuit breakers Brk4, brk5, brk6, and Brk7. After the fault is removed, the protection is restored to the whole group after the starting element returns.
Specifically, in the case where the main protection operation fails and the breaker fails, the case where the fault occurs in the P2 region and the breaker Brk4 fails is taken as an example. After starting, protection P2 sends a blocking signal to the adjacent protection, and protection P6 starts and receives the blocking signal sent by protection P2. When the protection P2 judges that the internal fault occurs and then the circuit breakers TRIP =1 on each side are jumped, a locking signal is sent
Now protect P6 no longer receives the blocking signal sent by the protection P2, i.e. RES _ SIG =0, and the main protection action MP _ OP =0, the fault feature has not disappeared FLT _ notify =1, and the time T of the setting has elapsed set After the delay, the circuit breaker Brk4 is judged to be out of order, and the failure protection is started
Protection P6 operates on circuit breakers Brk4, brk5, brk6 and Brk7. After the fault is removed, the protection is restored to the whole group after the starting element returns.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A station domain failure protection method based on switching value signals is characterized by comprising the following steps:
s1, acquiring a starting element state of the protection device, and sending a switching value signal to an adjacent protection device according to the starting element state, wherein the switching value signal is used for locking the adjacent protection device;
s2, acquiring a main protection starting state of the protection device, judging whether main protection of the protection device should act, if so, sending a tripping command to a circuit breaker of a protection area where the protection device is located by the protection device, stopping sending a switching value signal to an adjacent protection device, and if not, entering a step S3;
s3, acquiring switching value signals sent by adjacent protection devices and fault characteristic information of a protection area where the adjacent protection devices are located, judging whether the protection device is to be used as a failure protection action or not by combining a starting element state, a main protection starting state and a main protection action state of the protection device, if the protection device is to be used as the failure protection action, sending a tripping command to a circuit breaker of the protection area, stopping sending the switching value signals to the adjacent protection devices, realizing station area failure protection, and if not, resetting the protection device after the starting element returns;
in the step S3, when a fault occurs in a protection area where the adjacent protection device is located, the adjacent protection device sends a trip command and stops sending a switching value signal; if the adjacent protection device fails, the fault can not be removed all the time, and the switching value signal can not be sent to the protection device all the time, after the protection device is started, the external fault is judged, the switching value signal sent by the failed protection device can not be received all the time, the time delay is started, the time delay is timed, whether the fault characteristic of the branch circuit connected with the adjacent protection device disappears or not is continuously monitored, and if the fault characteristic does not disappear, the setting time is passed
After delaying, the protection device sends out a tripping command and stops sending out a switching value signal, each protection device starts an element to return after the fault is removed, and the protection devices are successively reset;
in the step S3, when a fault occurs in a protection area where the adjacent protection device is located, the adjacent protection device sends a trip command and stops sending a switching value signal; if the corresponding circuit breaker fails, the fault can not be removed all the time, the protection device receives the switching value signal sent by the adjacent protection device after being started, the adjacent protection device does not receive the switching value signal after acting, the protection device judges that the external fault exists, starts time delay and timing, continuously monitors whether the fault characteristic of a branch circuit connected with the adjacent protection device disappears or not, and if the fault characteristic does not disappear, the fault characteristic is subjected to setting time
After the delay, the protection device sends out a tripping command and stops sending out a switching value signal, and each protection device starts an element to return after the fault is removed, so that the protection is successively reset.
2. The switching value signal-based station domain failure protection method as claimed in claim 1, wherein the main protection of the present protection device covers 100% of the protection area, and all the present protection device and the adjacent protection device exchange switching value signals through a secondary loop.
3. The station domain failure protection method based on the switching value signal as claimed in claim 1, wherein when a fault occurs in a protection zone where the protection device is located, the starting element is started in response to a fault disturbance to send the switching value signal to other protection devices adjacent to the protection device; when the protection device judges that the inside of the protection device has a fault, a trip command is sent out, and meanwhile, the sending of a switching value signal is stopped, and the adjacent protection devices do not receive the switching value signal sent by the protection device any more; after the fault is removed, each protection device starts the element to return, and the protection devices are successively reset.
4. A station domain fault protection system based on a switching value signal, comprising: a computer-readable storage medium and a processor;
the computer-readable storage medium is used for storing executable instructions;
the processor is used for reading executable instructions stored in the computer-readable storage medium and executing the station domain malfunction protection method based on the switching value signal in any one of claims 1 to 3.
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| CN112736870B (en) * | 2020-12-24 | 2022-03-29 | 华中科技大学 | Adjacent cooperative remote backup protection method |
| CN113964801B (en) * | 2021-10-13 | 2024-06-18 | 南京南瑞继保电气有限公司 | Distance protection optimization method and device for high-voltage line protection device |
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