CN112582996A - Power distribution network protection method and device and storage medium - Google Patents
Power distribution network protection method and device and storage medium Download PDFInfo
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- CN112582996A CN112582996A CN202011376026.8A CN202011376026A CN112582996A CN 112582996 A CN112582996 A CN 112582996A CN 202011376026 A CN202011376026 A CN 202011376026A CN 112582996 A CN112582996 A CN 112582996A
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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
Abstract
The application relates to a power distribution network protection method, a power distribution network protection device and a storage medium. The method comprises the following steps: monitoring whether the power distribution network fails in real time; when the power distribution network fails, acquiring a line position where the fault occurs, and recording the line position as a fault point; acquiring the current electric signals related to the fault points and recording the electric signals as line protection characteristics; tripping a circuit breaker associated with the fault point according to the line protection characteristic, and stopping power supply to the fault point; and when the distribution network generates a no-voltage signal and a no-current signal, restoring the power supply of a non-fault area outside the fault area according to the differential protection characteristic. The method can automatically remove the fault and automatically recover power supply and has high safety.
Description
Technical Field
The present application relates to the field of power distribution network protection technologies, and in particular, to a power distribution network protection method, device, and storage medium.
Background
With the continuous development of power technology, safety utilization is an important problem of power transmission, and related power distribution network fault location and fault elimination methods are presented to guarantee the safety of power transmission of a power distribution network.
In the conventional technology, a 10kV distribution network is generally provided with a circuit breaker in a substation, and a ring main unit is provided in a small-sized switching station outside the substation, wherein the ring main unit comprises a load switch and a circuit breaker, and the load switch is provided on a load side. When a load side outside a transformer substation breaks down, a breaker in a small switching station trips, then after a fault point (namely the position of the load side with the fault) is found and found through manual line patrol, load switches on two sides of the fault point are pulled open manually, then the breaker in the small switching station is switched on, so that power supply of a power distribution network is recovered, and the whole power supply recovery process generally needs 1-2 hours.
However, because the load switch cannot be tripped to remove the fault directly due to limited breaking capability, the fault can be removed only after the load switch of the fault point is tripped manually, so that the fault removal efficiency is low, the safety of the use of the power distribution network is reduced, and the power distribution network cannot automatically recover power supply.
Disclosure of Invention
In view of the above, it is desirable to provide a power distribution network protection method, device, and storage medium that can automatically eliminate a fault and automatically recover power supply, and that are highly safe.
The invention provides a power distribution network protection method, which comprises the following steps:
monitoring whether the power distribution network fails in real time;
when the power distribution network fails, acquiring a line position where the fault occurs, and recording the line position as a fault point;
acquiring the current electric signals related to the fault points and recording the electric signals as line protection characteristics;
tripping a circuit breaker associated with the fault point according to the line protection characteristic, and stopping power supply to the fault point;
and when the distribution network generates a no-voltage signal and a no-current signal, restoring the power supply of a non-fault area outside the fault area according to the differential protection characteristic.
Preferably, the power distribution network comprises a substation and an open-close station connected with the substation;
when the power distribution network fails, the step of acquiring the line position where the failure occurs and recording the line position as a failure point comprises the following steps:
when an internal line between the transformer substation and the switching station has a fault, acquiring a fault internal line between the transformer substation and the switching station, and marking the fault internal line as a fault point;
the step of collecting the current electrical signals associated with the fault point and recording as line protection characteristics comprises:
collecting differential electric signals of the fault inner line and recording the differential electric signals as inner line differential protection characteristics;
the step of tripping a circuit breaker associated with the fault point in accordance with the line protection characteristic and stopping power to the fault point comprises:
tripping a circuit breaker in the substation according to the inner line differential protection characteristic to stop supplying power to the fault inner line;
when the distribution network generates a no-voltage signal and a no-current signal, the step of recovering the power supply of a non-fault area outside the fault area according to the differential protection characteristic comprises the following steps:
when the bus of the switching station is in a voltage-free state, generating a bus voltage-free signal of the switching station;
when the incoming line of the switching station is in a no-current state, generating an incoming line no-current signal of the switching station;
and according to the bus no-voltage signal and the incoming line no-current signal of the switching station and the differential protection characteristics of the inner lines, tripping off a load switch connected with the incoming line of the switching station, judging the load of the switching station, and recovering the power supply between the inner lines without faults between the transformer substation and the switching station when the switching station has no overload risk.
Preferably, the power distribution network comprises a substation and an open-close station connected with the substation;
when the power distribution network fails, the step of acquiring the line position where the failure occurs and recording the line position as a failure point comprises the following steps:
when the bus of the switching station fails, acquiring a switching fault bus of the switching station, and recording the switching fault bus as a fault point;
the step of collecting the current electrical signals associated with the fault point and recording as line protection characteristics comprises:
collecting the differential electric signals of the open-close fault bus and recording as the differential protection characteristics of the open-close bus;
the step of tripping a circuit breaker associated with the fault point in accordance with the line protection characteristic and stopping power to the fault point comprises:
tripping a circuit breaker in the substation according to the differential protection characteristic of the switching bus to stop power supply to the switching fault bus;
when the distribution network generates a no-voltage signal and a no-current signal, the step of recovering the power supply of a non-fault area outside the fault area according to the differential protection characteristic comprises the following steps:
when the bus of the switching station is in a voltage-free state, generating a bus voltage-free signal of the switching station;
when the incoming line of the switching station is in a no-current state, generating an incoming line no-current signal of the switching station;
and according to the bus no-voltage signal and the incoming line no-current signal of the switching station and the differential protection characteristic of the inner line, tripping off all switches connected with the bus of the switching station, judging the load of the switching station, and recovering the power supply of the bus of the switching station when the switching station has no overload risk.
Preferably, the power distribution network comprises a substation, an open-close station connected with the substation, and a power distribution room connected with the open-close station;
when the power distribution network fails, the step of acquiring the line position where the failure occurs and recording the line position as a failure point comprises the following steps:
when a rear-end feeder line of the switching station or a bus of the power distribution room breaks down, acquiring a rear-end fault feeder line of the switching station or a power distribution fault bus of the power distribution room, and marking the rear-end fault feeder line or the power distribution fault bus as a fault point; the rear-end feeder line is a line section corresponding to a load and a feeder line of the circuit breaker of the switching station;
the step of collecting the current electrical signals associated with the fault point and recording as line protection characteristics comprises:
collecting the differential electric signal of the rear-end fault feeder line, and recording the differential electric signal as the differential protection characteristic of the rear-end feeder line; or, collecting the differential electric signal of the distribution fault bus and recording as the differential protection characteristic of the distribution bus;
collecting the current of all switches of the switching station or the power distribution room and recording the current as characteristic current;
the step of tripping a circuit breaker associated with the fault point in accordance with the line protection characteristic and stopping power to the fault point comprises:
tripping a circuit breaker in the switching station according to the rear-end feeder differential protection characteristic or the distribution bus differential protection characteristic to stop supplying power to the fault point;
when the distribution network generates a no-voltage signal and a no-current signal, the step of recovering the power supply of a non-fault area outside the fault area according to the differential protection characteristic comprises the following steps:
when the load side of the switching station or the load side of the power distribution room is in a no-voltage state, generating a no-voltage signal of the load side;
when the load side of the switching station or the load side of the power distribution room is in a current-free state, generating a load side current-free signal;
according to the load side no-voltage signal, the load side no-current signal and the rear end feeder line differential protection characteristic or the distribution bus differential protection characteristic, tripping the load switches on two sides of the fault point and generating a load switch opening success signal;
controlling a breaker in the switching station to be switched on according to the load switch switching-off success signal so as to recover the power supply of an upstream area of the fault point; and/or the presence of a gas in the gas,
and recovering the power supply of the downstream area of the fault point according to the characteristic current.
Preferably, the power distribution network comprises a substation, an open-close station connected with the substation, and a power distribution room connected with the open-close station;
when the power distribution network fails, the step of acquiring the line position where the failure occurs and recording the line position as a failure point comprises the following steps:
when a branch line of the power distribution room fails, acquiring a power distribution failure branch line of the power distribution room, and marking the power distribution failure branch line as a failure point;
the step of collecting the current electrical signals associated with the fault point and recording as line protection characteristics comprises:
collecting overcurrent signals of the power distribution fault branch lines and recording the overcurrent signals as branch line phase overcurrent protection characteristics;
the step of tripping a circuit breaker associated with the fault point in accordance with the line protection characteristic and stopping power to the fault point comprises:
tripping off the circuit breaker of the switching station according to the branch phase overcurrent protection characteristic to stop supplying power to the switching fault bus;
when the distribution network generates a no-voltage signal and a no-current signal, the step of recovering the power supply of a non-fault area outside the fault area according to the differential protection characteristic comprises the following steps:
when the feeder line group of the switching station is in a no-voltage state, generating a no-voltage signal of the feeder line of the switching station;
when the feeder line group of the switching station is in a current-free state, generating a feeder line current-free signal of the switching station;
according to the feeder line no-voltage signal and the feeder line no-current signal of the switching station and the branch line phase overcurrent protection characteristics, tripping off a load switch associated with the distribution fault branch line and generating a load switch opening success signal;
and controlling a breaker in the switching station to be switched on according to the load switch switching-off success signal so as to recover the power supply of the line beyond the fault point.
The invention provides a power distribution network protection device, which comprises:
the line protection unit is used for monitoring whether the power distribution network fails in real time; the system comprises a power distribution network, a fault point acquisition unit, a fault detection unit and a fault detection unit, wherein the power distribution network is used for acquiring a line position with a fault when the power distribution network has the fault and recording the line position as the fault point; the system is used for acquiring the current electric signals related to the fault points and recording the electric signals as line protection characteristics; the circuit breaker is used for tripping off a circuit breaker associated with the fault point according to the line protection characteristic and stopping power supply to the fault point;
and the protection remote control closing unit is used for recovering the power supply of a non-fault area outside the fault area according to the differential protection characteristic when the distribution network generates a no-voltage signal and a no-current signal.
Preferably, the power distribution network protection device comprises a transformer substation, an open-close station connected with the transformer substation, and a power distribution room connected with the open-close station; the line protection unit comprises a line longitudinal differential protection device configured on the transformer substation and a power distribution protection device configured on the switching station and the power distribution room; the circuit longitudinal differential protection device is connected with the power distribution protection devices of the switching station, the power distribution protection devices of the switching station are connected with the adjacent power distribution protection devices of the power distribution rooms in a communication mode, and the two adjacent power distribution protection devices of the power distribution rooms form a communication connection and jointly form a circuit longitudinal differential protection channel of the power distribution network.
Preferably, the power distribution protection device includes: the circuit differential protection unit is used for realizing phase current differential protection and zero-sequence current differential protection of a main power supply circuit; the bus differential protection unit is used for realizing phase current differential protection of a power distribution room bus; the backup protection unit is used for realizing backup protection of all lines and phase overcurrent protection and zero sequence overcurrent protection of branch lines; the load studying and judging unit is used for realizing load transfer after a fault and load calculation for automatically recovering power supply of a non-fault area;
the line longitudinal differential protection device comprises: the circuit differential protection unit is used for realizing phase current differential protection and zero-sequence current differential protection of a main power supply circuit; and the backup protection unit is used for realizing phase overcurrent protection and zero sequence overcurrent protection of the main power supply circuit.
The invention provides a power distribution network protection device, which comprises a memory and a processor, wherein the memory stores a computer program; the processor implements the steps of the power distribution network protection method of the present invention when executing the computer program.
The present invention provides a computer-readable storage medium having stored thereon a computer program; the computer program, when executed by a processor, implements the steps of the power distribution network protection method of the present invention.
According to the power distribution network protection method, the power distribution network protection device and the storage medium, when the power distribution network fails, the line position where the fault occurs can be quickly located, the fault can be reliably isolated, the fault can be automatically eliminated, the power supply of a non-fault area can be automatically recovered, only one power failure occurs in the whole process, the power supply of the non-fault area can be recovered within 15 seconds at the fastest speed, the fault elimination efficiency is high, and the safety is high.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a power distribution network protection method according to an embodiment of the present invention;
FIG. 2 is a power distribution network provided in one embodiment of the present invention;
fig. 3 is a schematic diagram of a portion of a fault point of a power distribution network provided in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further 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 present application and are not intended to limit the present application.
In an embodiment, as shown in fig. 1, a method for protecting a power distribution network is provided, which specifically includes the following steps:
and step 210, when the distribution network generates a no-voltage signal and a no-current signal, restoring power supply of a non-fault area outside the fault area according to the differential protection characteristic.
By the method, when the power distribution network has a fault, the position of the faulted line can be quickly positioned and the fault can be reliably isolated, the fault can be automatically removed, the power supply of the non-fault area can be automatically recovered, only one power failure occurs in the whole process, the power supply of the non-fault area can be recovered within 15 seconds at the fastest speed, the fault removal efficiency is high, and the safety is high.
In one embodiment, the above method is applied to a distribution network shown in fig. 2-3, which is configured with a distribution network protection device comprising a substation (not shown), an open-close station (i.e., # a and # B) connected to the substation, and a distribution room (i.e., #1, #2, #3, #4, #5, #6, #7, #8) connected to the open-close station. The line protection unit comprises a line longitudinal differential protection device configured on the transformer substation and a power distribution protection device configured on the switching station and the power distribution room; the circuit longitudinal differential protection device is connected with the power distribution protection devices of the switching station, the power distribution protection devices of the switching station are connected with the adjacent power distribution protection devices of the power distribution rooms in a communication mode, and the two adjacent power distribution protection devices of the power distribution rooms form a communication connection and jointly form a circuit longitudinal differential protection channel of the power distribution network. The following description will be made on the protection method of the power distribution network, with reference to fig. 1 to 3:
Specifically, whether faults occur in the substation, outside the substation and between the substation and the switching station or not is monitored in real time through the line longitudinal differential protection device, and whether faults occur in the switching station, between the switching station and the power distribution room, in the power distribution room and between the power distribution room and the power distribution room or not is monitored in real time through the power distribution protection device.
and step 210, when the distribution network generates a no-voltage signal and a no-current signal, restoring power supply of a non-fault area outside the fault area according to the differential protection characteristic.
It should be noted that, when the positions of the faults occur are different, the specific implementation processes of step 202 to step 210 are also different, and for convenience of understanding, the specific implementation processes of step 202 to step 210 are respectively described below in conjunction with different fault situations:
(1) when a fault occurs in an internal line between a circuit breaker and a switching station in a substation:
the step 204 specifically includes: when an internal line between the transformer substation and the switching station has a fault, acquiring a fault internal line between the transformer substation and the switching station, and marking the fault internal line as a fault point;
the step 206 specifically includes: collecting differential electric signals of the fault inner line and recording the differential electric signals as inner line differential protection characteristics;
the step 208 specifically includes: tripping a circuit breaker in the substation according to the internal line differential protection characteristic to stop power supply to the faulted internal line
The step 210 specifically includes:
when the bus of the switching station is in a voltage-free state, generating a bus voltage-free signal of the switching station;
when the incoming line of the switching station is in a no-current state, generating an incoming line no-current signal of the switching station;
and according to the bus no-voltage signal and the incoming line no-current signal of the switching station and the differential protection characteristics of the inner lines, tripping off a load switch connected with the incoming line of the switching station, judging the load of the switching station, and recovering the power supply between the inner lines without faults between the transformer substation and the switching station when the switching station has no overload risk.
(2) When the bus of the switching station fails:
the step 204 specifically includes: when the bus of the switching station fails, acquiring a switching fault bus of the switching station, and recording the switching fault bus as a fault point;
the step 206 specifically includes: collecting the differential electric signals of the open-close fault bus and recording as the differential protection characteristics of the open-close bus;
the step 208 specifically includes: tripping a circuit breaker in the substation according to the differential protection characteristic of the switching bus to stop power supply to the switching fault bus;
the step 210 specifically includes:
when the bus of the switching station is in a voltage-free state, generating a bus voltage-free signal of the switching station;
when the incoming line of the switching station is in a no-current state, generating an incoming line no-current signal of the switching station;
and according to the bus no-voltage signal and the incoming line no-current signal of the switching station and the differential protection characteristic of the inner line, tripping off all switches connected with the bus of the switching station, judging the load of the switching station, and recovering the power supply of the bus of the switching station when the switching station has no overload risk.
(3) When a line section on a back-end feeder load path of a circuit breaker of a switching station or a bus of a distribution room fails:
the step 204 specifically includes: when a rear-end feeder line of the switching station or a bus of the power distribution room breaks down, acquiring a rear-end fault feeder line of the switching station or a power distribution fault bus of the power distribution room, and marking the rear-end fault feeder line or the power distribution fault bus as a fault point; the rear-end feeder line is a line section corresponding to a load and a feeder line of the circuit breaker of the switching station;
the step 206 specifically includes:
collecting the differential electric signal of the rear-end fault feeder line, and recording the differential electric signal as the differential protection characteristic of the rear-end feeder line; or, collecting the differential electric signal of the distribution fault bus and recording as the differential protection characteristic of the distribution bus;
collecting the current of all switches of the switching station or the power distribution room and recording the current as characteristic current;
the step 208 specifically includes: tripping a circuit breaker in the switching station according to the rear-end feeder differential protection characteristic or the distribution bus differential protection characteristic to stop supplying power to the fault point;
the step 210 specifically includes:
when the load side of the switching station or the load side of the power distribution room is in a no-voltage state, generating a no-voltage signal of the load side;
when the load side of the switching station or the load side of the power distribution room is in a current-free state, generating a load side current-free signal;
according to the load side no-voltage signal, the load side no-current signal and the rear end feeder line differential protection characteristic or the distribution bus differential protection characteristic, tripping the load switches on two sides of the fault point and generating a load switch opening success signal;
controlling a breaker in the switching station to be switched on according to the load switch switching-off success signal so as to recover the power supply of an upstream area of the fault point; and/or the presence of a gas in the gas,
and recovering the power supply of the downstream area of the fault point according to the characteristic current.
(4) When a branch of the power distribution room fails:
the step 204 specifically includes: when a branch line of the power distribution room fails, acquiring a power distribution failure branch line of the power distribution room, and marking the power distribution failure branch line as a failure point;
the step 206 specifically includes: collecting overcurrent signals of the power distribution fault branch lines and recording the overcurrent signals as branch line phase overcurrent protection characteristics;
the step 208 specifically includes: tripping off the circuit breaker of the switching station according to the branch phase overcurrent protection characteristic to stop supplying power to the switching fault bus;
the step 210 specifically includes:
when the feeder line group of the switching station is in a no-voltage state, generating a no-voltage signal of the feeder line of the switching station;
when the feeder line group of the switching station is in a current-free state, generating a feeder line current-free signal of the switching station;
according to the feeder line no-voltage signal and the feeder line no-current signal of the switching station and the branch line phase overcurrent protection characteristics, tripping off a load switch associated with the distribution fault branch line and generating a load switch opening success signal;
and controlling a breaker in the switching station to be switched on according to the load switch switching-off success signal so as to recover the power supply of the line beyond the fault point.
Further, to facilitate understanding of the present invention, the method will be described below in connection with the point of failure as shown in FIG. 3:
when an F1 fault occurs, a circuit longitudinal differential protection unit in a load switch 2 of a circuit breaker F01 and a switching station # A2 operates, the circuit breaker F01 immediately trips, then, no current exists in the load switch 2 of the switching station # A, no voltage exists in a bus of the switching station # A, the load switch 2 of the switching station # A trips according to the action memory of the circuit longitudinal differential protection unit, due to the fact that the circuit is in a first-stage circuit fault, if the circuit is a cable circuit, a circuit breaker s1 operates according to the circuit longitudinal differential protection unit to lock reclosing, fault isolation is completed, then, load current before the fault of the load switch 2 of the switching station # A is recorded according to a power distribution protection device, and if the overload situation does not occur when all loads are supplied by one power source, a switching-off action success signal of the load switch 2 of the switching station # A controls the switching-on of the load switch 8.
When the F2 fault occurs, the bus differential protection unit (hereinafter, simply referred to as the bus differential protection unit) of the switching station # A operates, the breaker F01 trips because the bus differential protection unit operates the far-jump line opposite side switch, the bus differential protection unit operates to jump the breaker 5 of the switching station # A, then the current of the load switch 2 of the switching station # A is detected, the voltage of the bus of the switching station # A is detected, the load switch 2 of the switching station # A is opened according to the action memory of the bus differential protection unit, meanwhile, the bus differential protection unit protects the load switch 10 of the far-jump switching station # B, the load switch 1 of the room #5 and the load switch 1 of the distribution room #1, the breaker F01 is locked and reclosed due to the far-jump action, the fault isolation is completed, then the load current before the breaker 5 of the switching station # A fails is recorded according to the distribution protection device, if the overload condition can not occur when the loads are all supplied by one power supply, the switching-off action success signal of the load switch 1 of the power distribution room #1 controls the switching-on of the load switch 8 of the switching station # B.
When an F3 fault occurs, a circuit breaker 5 of an opening and closing station # A and a line longitudinal differential protection unit of a load switch 1 of a power distribution room # 1 act, the circuit breaker 5 of the opening and closing station # A trips due to the action of a differential protection unit, then no voltage and no current exist in a load switch 1 and a load switch 103 of the power distribution room # 1 are detected, the load switch 1 of the power distribution room # 1 is opened according to the action memory of the line longitudinal differential protection unit, fault isolation is completed, then the load current before the fault of the load switch 1 of the power distribution room # 1 is recorded according to a power distribution protection device, and if the overload condition does not occur when all loads are supplied by one power supply, the opening and closing action success signal of the load switch 1 of the power distribution room # 1 controls the closing and closing of a load switch 8 of a load switch.
When an F4 fault occurs, a bus differential protection unit of a power distribution room # 1 operates, a breaker 5 of a switching station # A trips because the bus differential protection unit operates to trip a far-jump circuit opposite side switch, then, the fact that no current exists in a load switch 1 of the power distribution room # 1 and no voltage exists in the power distribution room # 1 is detected, the load switch 1, a load switch 2, a load switch 3 and a load switch 4 of the power distribution room # 1 trip according to the action memory of the bus protection unit, the load switch 1 of the power distribution room # 2 operates to trip the far-jump circuit opposite side switch to finish fault isolation, then, load current before the switch #12 fails is recorded according to a power distribution protection device, if the loads of the power distribution rooms # 2, #3 and #4 are all supplied by one power supply without overload, the load switch 1 of the power distribution room # 2 performs opening and closing operation success signal control on a load switch 8 of a switching station # B, thereby restoring the power supply of the power distribution rooms # 2, #3 and # 4.
When the F5 fault occurs, the branch overcurrent protection unit of the power distribution room # 1 operates, the breaker 5 of the switching station # A trips due to the operation of the overcurrent protection unit, then the load switch 4 of the branch power distribution room # 1 is detected to be free of voltage and current, the load switch 4 of the branch power distribution room # 1 is switched off according to the action memory of the branch overcurrent protection unit, and then the switch-off success signal of the load switch 4 of the branch power distribution room # 1 controls the switch-on operation of the breaker 5 of the switching station # A, so that the power supply of the power distribution rooms # 1, #2, #3 and #4 is recovered.
When an F6 fault occurs, the power distribution room #1 and #2 power distribution room lines perform differential protection action, the breaker 5 of the switching station # A trips due to the action of an overcurrent protection unit, then, no voltage exists in the power supply side power distribution room #1, no current exists in the load switch 2 of the power distribution room #1, the load switch 2 of the power distribution room #1 and the load switch 1 of the power distribution room #2 are switched off according to the action memory of a line longitudinal differential protection unit, fault isolation is completed, then, the switch-off success signal of the load switch 2 of the power distribution room #1 controls the switch 5 of the switching station # A to switch on and off, power supply of the power distribution room #1 is recovered, the load current before the switch failure of the load switch 1 of the power distribution room #2 is recorded according to a power distribution protection device, if the loads of the power distribution rooms #2, #3 and #4 are all supplied by one power supply without overload, the switch-off action success signal of the load switch 1 of the power distribution room #2 controls, thereby restoring the power supply of the power distribution rooms #2, #3 and # 4. If overload conditions occur when loads of the power distribution rooms # 2, #3 and #4 are all supplied by one power supply, the power distribution protection devices of the power distribution rooms # 5, #6, #7 and #8 provide load currents of respective corresponding switches to form a power transfer scheme, the related power transfer scheme is executed according to the device configuration, and then the load switch 8 of the switching station # B is closed, so that power supply of the power distribution rooms # 2, #3 and #4 is recovered.
When an F7 fault occurs, the longitudinal differential line protection unit between the bus of the switching station # a and the bus of the switching station # B operates, the breaker F03 trips due to the overcurrent protection unit, then, no voltage is detected on the bus of the switching station # B, no current is detected on the load switch 10 of the switching station # B, the load switch 10 of the switching station # B is opened according to the memory of the longitudinal differential line protection unit operation, fault isolation is completed, and then the opening operation success signal of the load switch 10 of the switching station # B controls the breaker F03 to close, and power supply in a non-fault area is recovered.
When an F8 fault occurs, the breaker F01 opens the breaker F01 when detecting no voltage and no current, the breaker F01 jumps far to the switching station # A2 load switch to complete fault isolation, then the load current before the fault of the load switch 2 of the switching station # A is recorded according to a power distribution protection device, and if the overload condition does not occur when the load is supplied by one path of power supply, the switching-off action of the load switch 2 of the switching station # A is successful, and the switching-on of the load switch 8 of the switching station # B is controlled by a signal.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 1 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
In one embodiment, the distribution network is provided with a distribution network protection device, and the distribution network protection device comprises a substation (not shown), an open-close station (i.e., # a and # B) connected with the substation, and a distribution room (i.e., #1, #2, #3, #4, #5, #6, #7, #8) connected with the open-close station.
The power distribution network protection device comprises a line protection unit and a protection remote control closing unit, wherein:
the line protection unit is used for monitoring whether the power distribution network fails in real time; the system comprises a power distribution network, a fault point acquisition unit, a fault detection unit and a fault detection unit, wherein the power distribution network is used for acquiring a line position with a fault when the power distribution network has the fault and recording the line position as the fault point; the system is used for acquiring the current electric signals related to the fault points and recording the electric signals as line protection characteristics; the circuit breaker is used for tripping off a circuit breaker associated with the fault point according to the line protection characteristic and stopping power supply to the fault point;
and the protection remote control closing unit is used for recovering the power supply of a non-fault area outside the fault area according to the differential protection characteristic when the distribution network generates a no-voltage signal and a no-current signal.
Specifically, the line protection unit includes a line longitudinal differential protection device disposed in the substation and a distribution protection device disposed in the switching station and the distribution room; the circuit longitudinal differential protection device is connected with the power distribution protection devices of the switching station, the power distribution protection devices of the switching station are connected with the adjacent power distribution protection devices of the power distribution rooms in a communication mode, and the two adjacent power distribution protection devices of the power distribution rooms form a communication connection and jointly form a circuit longitudinal differential protection channel of the power distribution network.
In one embodiment, the power distribution protection device includes: the circuit differential protection unit is used for realizing phase current differential protection and zero-sequence current differential protection of a main power supply circuit; the bus differential protection unit is used for realizing phase current differential protection of a power distribution room bus; the backup protection unit is used for realizing backup protection of all lines and phase overcurrent protection and zero sequence overcurrent protection of branch lines; and the load studying and judging unit is used for realizing load transfer after a fault and load calculation for automatically recovering power supply of a non-fault area.
In one embodiment, the line differential protection device includes: the circuit differential protection unit is used for realizing phase current differential protection and zero-sequence current differential protection of a main power supply circuit; and the backup protection unit is used for realizing phase overcurrent protection and zero sequence overcurrent protection of the main power supply circuit.
For specific limitations of the power distribution network protection device, reference may be made to the above limitations of the power distribution network protection method, and details are not repeated here. All or part of each module in the power distribution network protection device can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
The invention provides a power distribution network protection device, which comprises a memory and a processor, wherein the memory stores a computer program; the processor implements the steps of the power distribution network protection method of the present invention when executing the computer program.
The present invention provides a computer-readable storage medium having stored thereon a computer program; the computer program, when executed by a processor, implements the steps of the power distribution network protection method of the present invention.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A power distribution network protection method is characterized by comprising the following steps:
monitoring whether the power distribution network fails in real time;
when the power distribution network fails, acquiring a line position where the fault occurs, and recording the line position as a fault point;
acquiring the current electric signals related to the fault points and recording the electric signals as line protection characteristics;
tripping a circuit breaker associated with the fault point according to the line protection characteristic, and stopping power supply to the fault point;
and when the distribution network generates a no-voltage signal and a no-current signal, restoring the power supply of a non-fault area outside the fault area according to the differential protection characteristic.
2. The power distribution network protection method according to claim 1, wherein the power distribution network includes a substation and an open-close station connected to the substation;
when the power distribution network fails, the step of acquiring the line position where the failure occurs and recording the line position as a failure point comprises the following steps:
when an internal line between the transformer substation and the switching station has a fault, acquiring a fault internal line between the transformer substation and the switching station, and marking the fault internal line as a fault point;
the step of collecting the current electrical signals associated with the fault point and recording as line protection characteristics comprises:
collecting differential electric signals of the fault inner line and recording the differential electric signals as inner line differential protection characteristics;
the step of tripping a circuit breaker associated with the fault point in accordance with the line protection characteristic and stopping power to the fault point comprises:
tripping a circuit breaker in the substation according to the inner line differential protection characteristic to stop supplying power to the fault inner line;
when the distribution network generates a no-voltage signal and a no-current signal, the step of recovering the power supply of a non-fault area outside the fault area according to the differential protection characteristic comprises the following steps:
when the bus of the switching station is in a voltage-free state, generating a bus voltage-free signal of the switching station;
when the incoming line of the switching station is in a no-current state, generating an incoming line no-current signal of the switching station;
and according to the bus no-voltage signal and the incoming line no-current signal of the switching station and the differential protection characteristics of the inner lines, tripping off a load switch connected with the incoming line of the switching station, judging the load of the switching station, and recovering the power supply between the inner lines without faults between the transformer substation and the switching station when the switching station has no overload risk.
3. The power distribution network protection method according to claim 1, wherein the power distribution network includes a substation and an open-close station connected to the substation;
when the power distribution network fails, the step of acquiring the line position where the failure occurs and recording the line position as a failure point comprises the following steps:
when the bus of the switching station fails, acquiring a switching fault bus of the switching station, and recording the switching fault bus as a fault point;
the step of collecting the current electrical signals associated with the fault point and recording as line protection characteristics comprises:
collecting the differential electric signals of the open-close fault bus and recording as the differential protection characteristics of the open-close bus;
the step of tripping a circuit breaker associated with the fault point in accordance with the line protection characteristic and stopping power to the fault point comprises:
tripping a circuit breaker in the substation according to the differential protection characteristic of the switching bus to stop power supply to the switching fault bus;
when the distribution network generates a no-voltage signal and a no-current signal, the step of recovering the power supply of a non-fault area outside the fault area according to the differential protection characteristic comprises the following steps:
when the bus of the switching station is in a voltage-free state, generating a bus voltage-free signal of the switching station;
when the incoming line of the switching station is in a no-current state, generating an incoming line no-current signal of the switching station;
and according to the bus no-voltage signal and the incoming line no-current signal of the switching station and the differential protection characteristic of the inner line, tripping off all switches connected with the bus of the switching station, judging the load of the switching station, and recovering the power supply of the bus of the switching station when the switching station has no overload risk.
4. The power distribution network protection method according to claim 1, wherein the power distribution network includes a substation, a switching station connected to the substation, and a power distribution room connected to the switching station;
when the power distribution network fails, the step of acquiring the line position where the failure occurs and recording the line position as a failure point comprises the following steps:
when a rear-end feeder line of the switching station or a bus of the power distribution room breaks down, acquiring a rear-end fault feeder line of the switching station or a power distribution fault bus of the power distribution room, and marking the rear-end fault feeder line or the power distribution fault bus as a fault point; the rear-end feeder line is a line section corresponding to a load and a feeder line of the circuit breaker of the switching station;
the step of collecting the current electrical signals associated with the fault point and recording as line protection characteristics comprises:
collecting the differential electric signal of the rear-end fault feeder line, and recording the differential electric signal as the differential protection characteristic of the rear-end feeder line; or, collecting the differential electric signal of the distribution fault bus and recording as the differential protection characteristic of the distribution bus;
collecting the current of all switches of the switching station or the power distribution room and recording the current as characteristic current;
the step of tripping a circuit breaker associated with the fault point in accordance with the line protection characteristic and stopping power to the fault point comprises:
tripping a circuit breaker in the switching station according to the rear-end feeder differential protection characteristic or the distribution bus differential protection characteristic to stop supplying power to the fault point;
when the distribution network generates a no-voltage signal and a no-current signal, the step of recovering the power supply of a non-fault area outside the fault area according to the differential protection characteristic comprises the following steps:
when the load side of the switching station or the load side of the power distribution room is in a no-voltage state, generating a no-voltage signal of the load side;
when the load side of the switching station or the load side of the power distribution room is in a current-free state, generating a load side current-free signal;
according to the load side no-voltage signal, the load side no-current signal and the rear end feeder line differential protection characteristic or the distribution bus differential protection characteristic, tripping the load switches on two sides of the fault point and generating a load switch opening success signal;
controlling a breaker in the switching station to be switched on according to the load switch switching-off success signal so as to recover the power supply of an upstream area of the fault point; and/or the presence of a gas in the gas,
and recovering the power supply of the downstream area of the fault point according to the characteristic current.
5. The power distribution network protection method according to claim 1, wherein the power distribution network includes a substation, a switching station connected to the substation, and a power distribution room connected to the switching station;
when the power distribution network fails, the step of acquiring the line position where the failure occurs and recording the line position as a failure point comprises the following steps:
when a branch line of the power distribution room fails, acquiring a power distribution failure branch line of the power distribution room, and marking the power distribution failure branch line as a failure point;
the step of collecting the current electrical signals associated with the fault point and recording as line protection characteristics comprises:
collecting overcurrent signals of the power distribution fault branch lines and recording the overcurrent signals as branch line phase overcurrent protection characteristics;
the step of tripping a circuit breaker associated with the fault point in accordance with the line protection characteristic and stopping power to the fault point comprises:
tripping off the circuit breaker of the switching station according to the branch phase overcurrent protection characteristic to stop supplying power to the switching fault bus;
when the distribution network generates a no-voltage signal and a no-current signal, the step of recovering the power supply of a non-fault area outside the fault area according to the differential protection characteristic comprises the following steps:
when the feeder line group of the switching station is in a no-voltage state, generating a no-voltage signal of the feeder line of the switching station;
when the feeder line group of the switching station is in a current-free state, generating a feeder line current-free signal of the switching station;
according to the feeder line no-voltage signal and the feeder line no-current signal of the switching station and the branch line phase overcurrent protection characteristics, tripping off a load switch associated with the distribution fault branch line and generating a load switch opening success signal;
and controlling a breaker in the switching station to be switched on according to the load switch switching-off success signal so as to recover the power supply of the line beyond the fault point.
6. A protection device for a power distribution network, the protection device comprising:
the line protection unit is used for monitoring whether the power distribution network fails in real time; the system comprises a power distribution network, a fault point acquisition unit, a fault detection unit and a fault detection unit, wherein the power distribution network is used for acquiring a line position with a fault when the power distribution network has the fault and recording the line position as the fault point; the system is used for acquiring the current electric signals related to the fault points and recording the electric signals as line protection characteristics; the circuit breaker is used for tripping off a circuit breaker associated with the fault point according to the line protection characteristic and stopping power supply to the fault point;
and the protection remote control closing unit is used for recovering the power supply of a non-fault area outside the fault area according to the differential protection characteristic when the distribution network generates a no-voltage signal and a no-current signal.
7. The distribution network protection device of claim 6, wherein the distribution network protection device comprises a substation, a switching station connected to the substation, and a distribution room connected to the switching station; the line protection unit comprises a line longitudinal differential protection device configured on the transformer substation and a power distribution protection device configured on the switching station and the power distribution room; the circuit longitudinal differential protection device is connected with the power distribution protection devices of the switching station, the power distribution protection devices of the switching station are connected with the adjacent power distribution protection devices of the power distribution rooms in a communication mode, and the two adjacent power distribution protection devices of the power distribution rooms form a communication connection and jointly form a circuit longitudinal differential protection channel of the power distribution network.
8. The power distribution network protection device of claim 6, wherein the power distribution network protection device comprises: the circuit differential protection unit is used for realizing phase current differential protection and zero-sequence current differential protection of a main power supply circuit; the bus differential protection unit is used for realizing phase current differential protection of a power distribution room bus; the backup protection unit is used for realizing backup protection of all lines and phase overcurrent protection and zero sequence overcurrent protection of branch lines; the load studying and judging unit is used for realizing load transfer after a fault and load calculation for automatically recovering power supply of a non-fault area;
the line longitudinal differential protection device comprises: the circuit differential protection unit is used for realizing phase current differential protection and zero-sequence current differential protection of a main power supply circuit; and the backup protection unit is used for realizing phase overcurrent protection and zero sequence overcurrent protection of the main power supply circuit.
9. A power distribution network protection device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor when executing the computer program implements the steps of the power distribution network protection method according to any one of claims 1 to 6.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the power distribution network protection method according to any one of claims 1 to 6.
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