CN109586257B - Selective self-adaptive cross-station ring network system fault processing method - Google Patents
Selective self-adaptive cross-station ring network system fault processing method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—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
- 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
- H02H7/263—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 measured values
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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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Abstract
The disclosure relates to a selective self-adaptive cross-station ring network system fault processing method, which comprises the following steps: establishing a cross-station ring network system topology model; collecting relevant parameters of equipment in a topological model of a cross-station ring network system; operating basic logic criteria according to the related parameters to generate an operation result; and sending an alarm according to the operation result or outputting a control signal corresponding to the operation result to a protection device in the cross-station ring network system topology model. The method realizes the monitoring, alarming and processing of the operation of the ring network, and can adaptively adjust the selective matching relationship of each protection device according to the change of relevant parameters when a fault occurs in the ring network and in the fault processing process, thereby ensuring the rationality of selective matching of each level of protection device and reducing the power failure range to the maximum extent.
Description
Technical Field
The invention belongs to the technical field of relay protection and safety automatic control of a power system, and particularly relates to a selective self-adaptive cross-station ring network system fault processing method.
Background
Generally, the selectivity of relay protection can ensure that each stage of relay protection device in the power grid is matched with each other according to the upper and lower stages of set values such as respective action values, action time and the like, so that accurate judgment of fault points and removal of main backup actions are realized, and the purpose of reducing the power failure range as much as possible is achieved. The selectivity principle can be well implemented in the same substation and in the same-direction protection range of a plurality of protection devices. However, in the cross-station ring network, because network parameters change during the fault handling process, problems of improper selective coordination of each protection device and expanded power failure range may occur.
Disclosure of Invention
In view of this, the present disclosure provides a selective self-adaptive fault handling method for a cross-site ring network system, which solves the problem of power outage range expansion due to improper coordination of protection devices in the cross-site ring network during fault handling in the cross-site ring network.
According to an aspect of the present disclosure, a method for processing a fault of a selectively adaptive cross-site ring network system is provided, where the method includes:
establishing a cross-station ring network system topology model;
collecting relevant parameters of equipment in the cross-station ring network system topology model;
operating basic logic criteria according to the related parameters to generate an operation result;
and sending an alarm according to the operation result or outputting a control signal corresponding to the operation result to a protection device in the cross-station ring network system topology model.
In one possible implementation, the establishing a topology model of a cross-site ring network system includes: and establishing the cross-station ring network system topology model according to the station bus, the incoming line circuit breaker of the station bus, the bus tie circuit breaker of the station bus, the outgoing line circuit breaker of the station, the outgoing line opposite side bus of the station and the bus tie circuit breaker of the outgoing line opposite side bus of the station.
In one possible implementation, the relevant parameters include: the system comprises a bus voltage, a three-phase current of each breaker, a breaker state, a breaker bus side knife switch position state, a protection starting signal and a protection outlet signal of each breaker.
In a possible implementation manner, the basic logic criterion includes a preset parameter and a preset operation result corresponding to the preset parameter.
In a possible implementation manner, the running basic logic criterion according to the relevant parameter to generate a running result includes: and if the relevant parameters are consistent with preset parameters, taking a preset operation result corresponding to the preset parameters as the operation result.
In a possible implementation manner, the operating the basic logic criterion according to the relevant parameter, and generating the operation result includes: judging whether the incoming line circuit breakers of the buses of the station operate on the same bus and whether the outgoing line circuit breakers of the station operate on the same bus according to the position state of the side knife switch of each circuit breaker bus; and if the states of the breakers are closed, the incoming line breaker of the bus of the station runs on different buses, and the outgoing line breaker of the station runs on different buses, the generated running result is that the cross-station ring network system topology model is in a ring network running state.
In a possible implementation manner, the sending an alarm according to the operation result includes: and if the operation result is that the cross-station ring network system topology model is in a ring network operation state, sending an alarm signal.
In one possible implementation manner, the protection enable signal includes an enabled state and an disabled state, the operation result includes a system state and a fault direction, and the system state includes: the system is in fault and normal, and the fault direction comprises: breaker trouble positive direction, breaker trouble reverse direction, device software should have the function of adjusting the electric current polarity, and each phase cos phi is the positive value when guaranteeing that inlet wire electric current flows in the generating line, and each phase cos phi is the positive value when outlet wire electric current flows out the generating line, and each phase cos phi is the positive value when the bus-bar current flows from 1M to 2M, and each phase cos phi is the positive value when segmentation electric current flows to II sections from I section, according to relevant parameter operation basic logic criterion, the generation operation result includes: judging whether a system fault exists according to the protection starting signals of the circuit breakers; judging the fault direction of the corresponding circuit breaker according to the positive and negative of the power factor value of the maximum phase of the current of each circuit breaker; if the protection starting signal of a certain circuit breaker is in a started state and the power factor value of the maximum phase of the current of the circuit breaker is positive, the generated operation result is the positive direction of the fault of the circuit breaker; if the protection starting signal of a certain breaker is in a started state and the power factor value of the maximum phase of the breaker current is negative, the generated operation result is the reverse direction of the breaker fault.
In a possible implementation manner, the running basic logic criterion according to the relevant parameter to generate a running result includes: and determining a locking outlet signal output to each circuit breaker according to the fault direction and the protection outlet signal of each circuit breaker.
In a possible implementation manner, outputting a control signal corresponding to the operation result to a protection device in the topology model of the cross-site ring network system according to the operation result includes: and outputting a lockout outlet signal to the circuit breaker to control a lockout state of the circuit breaker outlet.
In one possible implementation, the protection outlet signal includes an exited state and an unopened state, the lockout outlet signal output to the circuit breaker includes a lockout outlet state and an unoccluded outlet state, the operation result further includes a reset signal, and the method further includes:
determining whether to reset the latching outlet signal of a certain circuit breaker according to the protection outlet signal of the circuit breaker or the state duration of the latching outlet state of the circuit breaker or the system state;
and if the protection outlet signal of a certain circuit breaker is in an outlet state or the circuit breaker is in a locked outlet state within a preset time or the system is normal, resetting the locked outlet signal of the circuit breaker to be in an unlocked outlet state.
The method comprises the steps of establishing a cross-station ring network system topology model, collecting parameters of equipment in the cross-station ring network system model, judging whether to send an alarm or not according to the collected related parameters or determining a control signal output to a protection device in the cross-station ring network system topology model according to the collected related parameters. According to the selective self-adaptive cross-station ring network system fault processing method disclosed by the invention, the state of the protection device in the ring network can be adaptively controlled according to the change of the acquired related parameters in the fault processing process of the cross-station ring network system, the matching rationality of the protection device in the cross-station ring network system is ensured, the power failure range is reduced to the greatest extent, and the removal of fault points is effectively ensured.
Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.
Fig. 1 shows a typical power system cross-site ring network system topology model schematic diagram according to an embodiment of the present disclosure.
Fig. 2 shows a flowchart of a method for processing a fault of a selectively adaptive cross-site ring network system according to an embodiment of the present disclosure.
Fig. 3 shows a flowchart of a method for processing a fault of a selectively adaptive cross-site ring network system according to an embodiment of the present disclosure.
Fig. 4 shows a method flowchart of step S13 according to an example of the present disclosure.
Fig. 5 illustrates a method flowchart of step S13 according to an example of the present disclosure.
Fig. 6 shows a flowchart of a method for processing a fault of a selectively adaptive cross-site ring network system according to an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
Fig. 1 shows a typical power system cross-site ring network system topology model schematic diagram according to an exemplary embodiment. Fig. 2 is a flowchart illustrating a method for processing a fault of a selectively adaptive cross-site ring network system according to an exemplary embodiment. Fig. 3 is a flowchart illustrating another selective adaptive cross-site ring network system fault handling method according to an exemplary embodiment.
Table 1 shows an illustration of basic logic criteria shown according to an exemplary embodiment, and table 2 shows a typical fault point and breaker selective mating relationship of a cross-station ring network system shown according to an exemplary embodiment.
Taking a typical power system cross-station ring network schematic diagram shown in fig. 1 as an example, the station domain protection device is installed on the side of a 220kV substation, so as to realize cross-station ring network monitoring and fault processing on a 110kV double-bus and a substation on the opposite side of the outgoing line thereof. Normally, a load flows from a 110kV bus of a 220kV substation to two sections of buses of the 110kV substation through a line 1(1# main transformer) and a line 2(2# main transformer), and circuit breakers BRK03 and BRK08 are connected to the respective buses on both sides.
As shown in fig. 1, fig. 2 and fig. 3, a method for processing a fault of a selectively adaptive cross-site ring network system according to an embodiment of the present disclosure includes:
step S11, establishing a cross-station ring network system topology model;
step S12, collecting relevant parameters of the equipment in the cross-station ring network system topology model;
step S13, operating the basic logic criterion according to the relevant parameters to generate an operation result;
and step S14, sending an alarm according to the operation result or outputting a control signal corresponding to the operation result to a protection device in the cross-site ring network system topology model.
The method comprises the steps of establishing a cross-station ring network system topology model, collecting relevant parameters of equipment in the cross-station ring network system model, judging whether to send an alarm or not according to the collected relevant parameters, or determining a control signal output to a protection device in the cross-station ring network system topology model according to the collected relevant parameters. According to the selective self-adaptive cross-station ring network system fault processing method disclosed by the invention, the state of the protection device in the ring network can be adaptively controlled according to the change of the acquired related parameters in the fault processing process of the cross-station ring network system, the matching rationality of the protection device in the cross-station ring network system is ensured, the power failure range is reduced to the greatest extent, and the removal of fault points is effectively ensured.
In one possible implementation, as shown in fig. 1, the typical cross-site ring network topology model includes: the station bus comprises a 110kV 1M bus and a 110kV2M bus; the incoming line breaker of the bus of the station comprises a breaker BRK01 and a breaker BRK 02; a bus tie breaker BRK03 of the bus of the station; the station outgoing line circuit breaker comprises circuit breakers BRK04, BRK05 and BRK 09; the station is provided with line opposite side circuit breakers, wherein the line opposite side circuit breakers comprise circuit breakers BRK06 and BRK 07; the bus on the opposite side of the outgoing line of the station comprises a 110kV I section bus and a 110kV II section bus; this station is qualified for next round of competitions the female circuit breaker that allies oneself with of offside generating line.
In one possible implementation, the section switch BRK08 of the bus on the opposite side of the station outlet is processed according to a bus tie breaker model.
In a possible implementation manner, the step S11 of establishing a topology model of the cross-site ring network system may include: and establishing the cross-station ring network system topology model according to the station bus, the incoming line circuit breaker of the station bus, the bus tie circuit breaker of the station bus, the outgoing line circuit breaker of the station, the outgoing line opposite side bus of the station and the bus tie circuit breaker of the outgoing line opposite side bus of the station.
In a possible implementation manner, the positions and numbers of the buses and the breakers are used as basic parameters in the topology model and are fixed.
In a possible implementation manner, relevant parameters of the equipment in the cross-site ring network system topology model can be collected in real time.
In one possible implementation, the acquired relevant parameters may include: the system comprises a bus voltage, a three-phase current of each breaker, a breaker state, a breaker bus side knife switch position state, a protection starting signal and a protection outlet signal of each breaker. The breaker state comprises a separating position and a closing position; the position states of the breaker bus side knife switch comprise an open position and a close position, the protection starting signal of each breaker comprises a started state and an un-started state, and the protection outlet signal of each breaker comprises an outlet state and an un-outlet state; the latched outlet signal output to the circuit breaker includes a latched outlet state and an unlatched outlet state.
For example, as shown in FIG. 1, the voltage of 110kV 1M and 110kV2M buses is collected, and 110kV I section and 110kV II section busesVoltage, three-phase currents of circuit breakers BRK01-BRK08, cos phi of maximum phase of current of each circuit breakermaxThe positive and negative of the circuit breakers BRK01-BRK08, the positions and states of the circuit breakers BRK01-BRK08 bus side disconnecting links (1M disconnecting link and 2M disconnecting link), and protection starting signals and protection outlet signals of the circuit breakers BRK01-BRK 08. Wherein cos phimaxThe power factor of the current maximum phase of the three phases, which is greater than 0.04 times the rated current (In), is taken.
In a possible implementation manner, the basic logic criterion includes a preset parameter and a preset operation result corresponding to the preset parameter.
In a possible implementation manner, the step S13 of operating the basic logic criterion according to the relevant parameter to generate an operation result may include: and if the relevant parameters are consistent with preset parameters, taking a preset operation result corresponding to the preset parameters as the operation result.
As shown in table 1 and table 2, for example, in the first basic logic criterion in table 1, "BRK 01 is in place, BRK02 is in place, BRK03 is in place, BRK04 is in place, BRK05 is in place, BRK06 is in place, BRK07 is in place, BRK08 is in place" is a preset parameter, and the logic names "BRK 01-BRK08 are all in place" are preset operation results corresponding to the matching of the relevant parameter and the preset parameter; in the second basic logic criterion in table 1, "1M knife switch of BRK01 is on, and 2M knife switch of BRK01 is off, and 1M knife switch of BRK02 is off, and 2M knife switch of BRK02 is on" or "1M knife switch of BRK01 is off, and 2M knife switch of BRK01 is on, and 1M knife switch of BRK02 is on, and 2M knife switch of BRK02 is off" as a preset parameter, and the logic names "BRK 01 and BRK02 operate on different generatrices" as a preset operation result corresponding to the matching of the relevant parameter and the preset parameter; in the fourth basic logic criterion in table 1, "BRK 01-BRK08 are all in-place, and BRK01 and BRK02 operate on different buses," and BRK04 and BRK05 operate on different buses "is a preset parameter, and a logic name" ring network operation flag "is a preset operation result corresponding to when a relevant parameter matches with the preset parameter; in the fifth basic logic criterion in Table 1, "BRK 01 protection is enabled, and cos φmax>0 'is a preset parameter, and the logic name' BRK01 fault is positiveThe step "is a preset operation result corresponding to the matching of the relevant parameters and the preset parameters; and when the relevant parameters are matched with the preset parameters, the logic value of the preset operation result corresponding to the preset parameters is 1, and the preset operation result is taken as the operation result.
For example, the collected related parameters are matched with preset parameters in the basic logic criteria in table 1, for example, if the collected related parameters are matched with the preset parameters in the basic logic criteria, the value of the preset operation result corresponding to the preset parameters is "1", and the preset operation result is taken as the operation result.
In a possible implementation manner, referring to table 1, matching the collected related parameters with preset parameters "BRK 01 protection start, or BRK02 protection start, or BRK03 protection start, or BRK04 protection start, or BRK05 protection start, or BRK06 protection start, or BRK07 protection start, or BRK08 protection start", if matching, the logic value of "system fault flag" is "1", and if not matching, the logic value of "system fault flag" is "0".
Fig. 4 shows a method flowchart of step S13 according to an example of the present disclosure.
In one possible implementation, as shown in fig. 4, the step S13 of operating the basic logic criterion according to the relevant parameter to generate an operation result may include:
step S131, judging whether the incoming line circuit breakers of the bus of the station operate on the same bus and whether the outgoing line circuit breakers of the station operate on the same bus according to the position state of the knife switch on the bus side of each circuit breaker;
step S132, if the states of the breakers are closed, the incoming line breaker of the bus of the station runs on different buses, and the outgoing line breaker of the station runs on different buses, the generated running result is that the topology model of the cross-station ring network system is in a ring network running state.
For example, referring to table 1, the acquired relevant parameters are matched with preset parameters in the basic logic criterion, and if the acquired relevant parameters satisfy that "BRK 01-BRK08 are all in the on position", "BRK 01 and BRK02 operate on different buses", and "BRK 04 and BRK05 operate on different buses", the logic value of the "ring network operation flag" is 1, which indicates that the current cross-station ring network system is in the ring network operation state.
In a possible implementation manner, the sending an alarm according to the operation result includes:
and if the operation result is that the cross-station ring network system topology model is in a ring network operation state, sending an alarm signal.
In a possible implementation manner, in order to reduce the workload of the station domain protection device during monitoring, if the alarm signal exists, that is, the topology model of the cross-station ring network system is in the ring network running state, the monitoring period of the cross-station ring network system is shortened, and if the alarm signal does not exist, that is, the topology model of the cross-station ring network system is in the non-ring network running state, the monitoring period of the cross-station ring network system is increased, so that the workload of the station domain protection device is reasonably distributed.
Fig. 5 illustrates a method flowchart of step S13 according to an example of the present disclosure.
In one possible implementation manner, the protection enable signal includes an enabled state and an disabled state, the operation result includes a system state and a fault direction, and the system state includes: the system is in fault and normal, and the fault direction comprises: the device software has the function of adjusting the current polarity when the circuit breaker has a positive fault direction and the circuit breaker has a negative fault direction, and ensures that each phase cos phi is a positive value when incoming current flows into a bus, each phase cos phi is a positive value when outgoing current flows out of the bus, each phase cos phi is a positive value when bus-bar current flows from 1M to 2M, and each phase cos phi is a positive value when sectional current flows from the section I to the section II.
In a possible implementation manner, referring to fig. 5, step S13, the operation of the basic logic criterion according to the relevant parameter to generate the operation result includes:
step S133, judging whether a system fault exists according to the protection starting signal of each breaker;
step S134, judging the fault direction of the corresponding breaker according to the positive and negative of the power factor value of the maximum phase of the current flowing through each breaker;
step S135, if the protection starting signal of a certain breaker is in a started state and the power factor value of the maximum phase of the current of the breaker is positive, the generated operation result is the positive direction of the fault of the breaker;
in step S136, if the protection start signal of a certain breaker is in a started state and the power factor value of the maximum phase of the breaker current is negative, the generated operation result is the opposite direction of the breaker fault.
In a possible implementation manner, referring to table 1, if the protection start signal of the breaker BRK01-BRK08 is collected as "BRK 01 protection start, or BRK02 protection start, or BRK03 protection start, or BRK04 protection start, or BRK05 protection start, or BRK06 protection start, or BRK07 protection start, or BRK08 protection start", that is, any breaker protection start, the system fault flag is "1", if the collected relevant parameter is protection start with a preset parameter "BRK 01, and COS Φ max > 0" matches, the generated operation result is a positive fault direction of the breaker BRK01, and if the collected relevant parameter is protection start with a preset parameter "BRK 01, and COS Φ max < 0" matches, the generated operation result is a negative fault direction of the breaker BRK 01.
In a possible implementation manner, referring to fig. 5, step S13, the operating the basic logic criterion according to the relevant parameter to generate the operation result may include:
and step S137, determining the locking outlet signal output to each circuit breaker according to the fault direction and the protection outlet signal of each circuit breaker.
In a possible implementation manner, referring to table 1, if the collected relevant parameter is the preset parameter ″ ' positive fault direction of BRK03, and the BRK03 protection outlet signal is 0, and the BRK01 positive fault direction ' or the BRK04 positive fault direction, and the BRK04 protection outlet signal is 0, and the BRK01 positive fault direction ' ″ matches, the generated operation result is that the logic value of the "blocking BRK01 outlet signal" is "1", which indicates that the value of the blocking outlet signal output to the breaker BRK01 is 1, and if the collected relevant parameter does not match the preset parameter, the generated operation result is that the logic value of the "blocking BRK01 outlet signal" is "0", which indicates that the value of the blocking outlet signal output to the breaker BRK01 is 0.
In a possible implementation manner, the step S14, outputting a control signal corresponding to the operation result to the protection device in the topology model of the cross-site ring network system according to the operation result may include: and outputting a lockout outlet signal to the circuit breaker to control a lockout state of the circuit breaker outlet.
Referring to table 2, according to the operation result of the basic logic criterion, the blocking exit signal is selectively output to part of the circuit breakers in the cross-station ring network system, so that the state of the protection device in the ring network is adaptively controlled according to the change of the acquired related parameters in the fault processing process of the cross-station ring network system, the rationality of the matching of the protection device in the cross-station ring network system is ensured, the power failure range is reduced to the maximum extent, and the removal of a fault point is effectively ensured.
Fig. 6 shows a flowchart of a method for processing a fault of a selectively adaptive cross-site ring network system according to an embodiment of the present disclosure.
In a possible implementation manner, the protection exit signal includes an exited state and an unexecuted state, and the operation result further includes a reset signal, as shown in fig. 6, and the method may further include:
step S15, according to the protection outlet signal of a certain breaker or the state duration of the locked outlet state of the breaker or the system state, determining whether to reset the locked outlet signal of the breaker;
step S16, if the protection exit signal of a certain circuit breaker is in the exit state or the circuit breaker is in the locked exit state within the preset time or the system is normal, the locked exit signal of the circuit breaker is reset to the unlocked exit state.
In one possible implementation, referring to table 1, for example, if the collected relevant parameters match preset parameters "BRK 01 protection exit signal is 1, or T (blocked BRK01 exit signal is 1) ═ Tset, or system fault flag is 0", that is, the breaker BRK01 protection exit signal is in an already-exited state, or the breaker exit is blocked for a certain time, or the system is normal, the blocked exit signal of the breaker BRK01 is reset, that is, the blocked exit state is sent and then is forcibly reset to an unblocked exit state by a fixed delay, so that the possibility of multi-stage rejection in an extreme case is prevented.
Application example
In a possible implementation manner, in the topology model of the cross-site ring network system shown in fig. 1, taking a fault occurring on a load side of a line 3 on a 110kV2M bus as an example, a fault processing method of the cross-site ring network system is as follows:
establishing a typical cross-station ring network system topology model as shown in FIG. 1;
collecting relevant parameters of equipment in a topological model of a cross-station ring network system;
according to the basic logic criterion in the table 1, when the load side of the line 3 on the 110kV2M bus has a fault, the generated operation result contains a ring network operation mark as 1, and an alarm signal is sent out;
the load side of the line 3 has a fault, and the flow direction of the fault current is as follows: BRK01-BRK03-BRK 09-fault point at the low-voltage side of the 1# main transformer in the 220kV transformer substation, and BRK02-BRK 09-fault point at the low-voltage side of the 2# main transformer in the 220kV transformer substation; therefore, BRK01, BRK02, BRK03, and BRK09 have actions of starting protection, and the selective matching relationship of the circuit breakers corresponding to a typical fault point, i.e., a 110kV2M fault point in the cross-station ring network, is shown in a record corresponding to sequence number 2 in table 2. Based on the cooperation relationship: "block BRK01 egress signal 1, block BRK02 egress signal 0, block BRK03 egress signal 0, block BRK05 egress signal 0", block BRK01 egress signal 1 indicates blocking the egress of circuit breaker BRK01, block BRK02 egress signal 0 and block BRK03 egress signal 0 indicates unblocking the egress of circuit breakers BRK02 and BRK03, circuit breakers BRK02 and BRK03 can protect the egress, i.e., BRK01 acts after BRK 03; the BRK02, the BRK03 and the BRK09 realize normal selective cooperation according to respective protection set values, namely, the lower-level protection BRK09 acts first, and the upper-level protection BRK02 and BRK03 act later;
if BRK09 protects against a malfunction or the circuit breaker fails: the protection actions of BRK02 and BRK03 trip BRK03, and at the moment, the fault point still exists, and the fault current flows to the following steps: a 1# main transformer low-voltage side circuit breaker BRK01-BRK04-BRK06-BRK08-BRK07-BRK05-BRK 09-fault point in a 220kV transformer substation, and a 2# main transformer low-voltage side circuit breaker BRK02-BRK 09-fault point in the 220kV transformer substation; the circuit breakers BRK01, BRK02 and BRK09 keep a protection starting state, and the circuit breakers BRK04, BRK05, BRK06, BRK07 and BRK08 are in protection starting; for the traditional protection device, because the BRK01 protection is started earlier than the BRK05, the BRK01 may act earlier than the BRK05, which results in the expansion of the power failure range; in this embodiment, the selective matching relationship of the 110kV2M fault point when the circuit breaker BRK03 is in the off-position is shown in a record corresponding to sequence number 4 in table 2, based on the matching relationship, the protection outlets of the circuit breakers BRK01, BRK04, BRK06, BRK08 and BRK07 are locked, the protection action of the circuit breaker BRK02 disconnects the fault current provided by the low-voltage side power supply of the 2# main transformer in the 220kV substation, and the protection action of the circuit breaker BRK05 disconnects the fault current provided by the low-voltage side power supply of the 1# main transformer in the 220kV substation;
after the circuit breakers BRK02 and BRK05 succeed in protection action: the fault point is amputated, the fault current disappears in the cross-station network, each breaker is protected and started to reset, and the flow direction of the load current is as follows: the low-voltage side of a 1# main transformer in a 220kV transformer substation is connected with 110kV 1M through a circuit breaker BRK01, and is connected with a 110kV I section bus in a 110kV transformer substation through a circuit breaker BRK 04-line 1-BRK06, and the 110kV I section bus runs in parallel with a 110kV II section bus through a circuit breaker BRK 08; in the fault processing process, only the 110kV2M bus in the 220kV transformer substation loses power, the fault is reasonably and effectively removed, and the power failure range in the cross-station ring network fault processing process is effectively reduced.
It should be noted that, although the selective adaptive cross-site ring network system fault handling method is described above by taking the cross-site ring network topology model shown in fig. 1 as an example, those skilled in the art can understand that the disclosure should not be limited thereto. In fact, the user can flexibly set the topology model of the cross-site ring network according to the actual system structure of the cross-site ring network, as long as the fault processing method of the cross-site ring network system can be applied to the established topology model of the cross-site ring network.
The basic logic criteria in the above embodiment are illustrated in table 1:
TABLE 1 description of the basic logical criteria
The selective coordination relationship of the circuit breakers in the cross-station ring network system corresponding to the exemplary embodiment during the processing of the fault point is shown in table 2:
TABLE 2 typical fault point and breaker selective coordination relationship
In practical engineering application, the method can be used as a sub-module in the station domain protection device, and can also be used as a main functional module of an independent station domain looped network fault judgment protection device to realize specific application.
By establishing a cross-station ring network system topology model, acquiring parameters of equipment in the cross-station ring network system model, judging whether to send an alarm or determine a control signal output to a protection device in the cross-station ring network system topology model according to the acquired related parameters, the selectively self-adaptive cross-station ring network system fault processing method can realize self-adaptive control of the state of the protection device in the ring network according to the variation of the acquired related parameters in the fault processing process of the cross-station ring network system, ensure the rationality of the matching of the protection device in the cross-station ring network system, reduce the power failure range to the greatest extent and effectively ensure the removal of fault points.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A selective self-adaptive cross-station ring network system fault processing method is characterized in that:
establishing a cross-station ring network system topology model;
collecting relevant parameters of equipment in the cross-station ring network system topology model;
operating basic logic criteria according to the related parameters to generate an operation result; the basic logic criterion comprises a preset parameter and a preset operation result corresponding to the preset parameter; and sending an alarm according to the operation result or outputting a control signal corresponding to the operation result to a protection device in the cross-station ring network system topology model.
2. The method of claim 1, wherein establishing a cross-site ring network system topology model comprises:
and establishing the cross-station ring network system topology model according to the station bus, the incoming line circuit breaker of the station bus, the bus tie circuit breaker of the station bus, the outgoing line circuit breaker of the station, the outgoing line opposite side bus of the station and the bus tie circuit breaker of the outgoing line opposite side bus of the station.
3. The method of claim 2, wherein the related parameters comprise:
the system comprises a bus voltage, a three-phase current of each breaker, a breaker state, a breaker bus side knife switch position state, a protection starting signal and a protection outlet signal of each breaker.
4. The method of claim 1, wherein operating a basic logic criterion based on the correlation parameter to generate an operating result comprises:
and if the relevant parameters are consistent with preset parameters, taking a preset operation result corresponding to the preset parameters as the operation result.
5. The method of any of claims 3-4, wherein operating a basic logic criterion based on the correlation parameter and generating an operational result comprises:
judging whether the incoming line circuit breakers of the buses of the station operate on the same bus and whether the outgoing line circuit breakers of the station operate on the same bus according to the position state of the side knife switch of each circuit breaker bus;
and if the states of the breakers are closed, the incoming line breaker of the bus of the station runs on different buses, and the outgoing line breaker of the station runs on different buses, the generated running result is that the cross-station ring network system topology model is in a ring network running state.
6. The method of claim 5, wherein issuing an alert based on the operational result comprises:
and if the operation result is that the cross-station ring network system topology model is in a ring network operation state, sending an alarm signal.
7. The method according to any one of claims 3-4, wherein the protection enable signal comprises an enabled state and a disabled state, the operation result comprises a system state and a fault direction, and the system state comprises: the system is in fault and normal, and the fault direction comprises: breaker trouble positive direction, breaker trouble reverse direction, device software should have the function of regulating current polarity, and the power factor of three-phase is positive value when guaranteeing that inlet wire electric current flows in the bus, and the power factor of three-phase is positive value when outlet wire electric current flows out the bus, three-phase power factor is positive value when bus-bar current flows from first bus to second bus, and the power factor of three-phase is positive value when segmentation electric current flows to II sections from I section, according to relevant parameter operation basic logic criterion, generates the operation result, includes:
judging whether a system fault exists according to the protection starting signals of the circuit breakers;
judging the fault direction of the corresponding circuit breaker according to the positive and negative of the power factor value of the maximum phase of the current flowing through each circuit breaker;
if the protection starting signal of a certain circuit breaker is in a started state and the power factor value of the maximum phase of the current of the circuit breaker is positive, the generated operation result is the positive direction of the fault of the circuit breaker;
if the protection starting signal of a certain breaker is in a started state and the power factor value of the maximum phase of the breaker current is negative, the generated operation result is the reverse direction of the breaker fault.
8. The method of claim 7, wherein operating basic logic criteria based on the correlation parameters to generate an operational result comprises:
and determining a locking outlet signal output to each circuit breaker according to the fault direction and the protection outlet signal of each circuit breaker.
9. The method according to claim 8, wherein outputting a control signal corresponding to the operation result to a protection device in the topology model of the cross-site ring network system according to the operation result comprises:
and outputting a lockout outlet signal to the circuit breaker to control a lockout state of the circuit breaker outlet.
10. The method of claim 9, wherein the protection outlet signal includes an exited state and an unopened state, wherein the lockout outlet signal output to the circuit breaker includes a lockout outlet state and an unoccluded outlet state, wherein the operation result further includes a reset signal,
the method further comprises the following steps:
determining whether to reset the latching outlet signal of a certain circuit breaker according to the protection outlet signal of the circuit breaker or the state duration of the latching outlet state of the circuit breaker or the system state;
and if the protection outlet signal of a certain circuit breaker is in an outlet state or the circuit breaker is in a locked outlet state within a preset time or the system is normal, resetting the locked outlet signal of the circuit breaker to be in an unlocked outlet state.
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