CN112886557B - Power distribution network main station and level difference protection coordination type self-healing method - Google Patents
Power distribution network main station and level difference protection coordination type self-healing method Download PDFInfo
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- CN112886557B CN112886557B CN202110389363.9A CN202110389363A CN112886557B CN 112886557 B CN112886557 B CN 112886557B CN 202110389363 A CN202110389363 A CN 202110389363A CN 112886557 B CN112886557 B CN 112886557B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H02H3/042—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned combined with means for locating the fault
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/063—Details concerning the co-operation of many similar arrangements, e.g. in a network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention discloses a power distribution network main station and level difference protection coordination type self-healing method, which is characterized in that self-healing switch information, feeder group locking information, feeder group open-loop closed-loop information, feeder group input and exit information and the like are set, and a fault area is automatically searched under the condition of line tripping fault, so that the technical problem that a main station self-healing program wrongly positions the fault area under the condition of switch override tripping caused by level difference matching mismatching after the operation mode of a feeder is changed is effectively solved.
Description
Technical Field
The invention relates to the technical field of power distribution network safety protection, in particular to a power distribution network master station and level difference protection cooperative self-healing method.
Background
The main station and the level difference protection cooperation type self-healing are coordinated, the power distribution terminal trips on the spot to quickly finish upstream isolation of faults, and the power distribution main station finishes accurate positioning and isolation of the faults and restoration of power in a non-fault section. The fault location logic can be basically summarized as: according to the power supply path topology, the last trip switch or overcurrent alarm switch is searched from the side of the level difference protection trip switch or the level difference alarm switch far away from the power supply of the power grid to be used as a fault point upstream boundary switch, then the search is continued towards the downstream of the power supply, the first switch without trip and overcurrent alarm at the downstream is found to be used as a fault point downstream boundary switch, and the interval between the upstream boundary switch and the downstream boundary switch is used as the whole fault area, for example, in the graph 1, the fault area is arranged between the switch 3 and the switch 4, the switch 3 is the upstream boundary switch, and the switch 4 is the downstream boundary switch. In order to isolate the faults of the power distribution network in a small range during the faults, an operator generally performs fixed value setting on the protection of the off-station switch according to the overcurrent fixed value/action time limit of the 10kV outgoing switch of the transformer substation, the action performance of the off-station switch and the specific situation of a line, so that the protection level difference can be formed. Under the normal operation mode, when a feeder line has a fault, an automatic switch with the step difference protection on the feeder line trips according to set action current/time limit, the fault is isolated by a step difference switch (switch 3) with the minimum action time limit, then an automatic main station analyzes the fault and locates a fault interval (between the switch 3 and the switch 4) according to information such as switch opening/closing, locking signals, protection action signals, topological structures and the like, then the main station sends a remote control command, a fault downstream switch (switch 4) is switched off to realize complete isolation of the fault interval, then the automatic main station sends the remote control command to switch on a tie switch (switch 6) in a non-fault area, and a power supply is introduced from an opposite side circuit to restore the power supply in the non-fault area.
At present, a distribution network automatic switch protection constant value is set by a line operator according to a relevant setting principle, and the time consumption is long. After the operation mode of the self-healing feeder group is changed temporarily, the fixed value cannot be automatically updated according to the operation mode of the line, the fixed value of the switch protection needs to be manually set to the site or remotely set, and if the site terminal cannot be modified timely according to requirements due to the level difference fixed value, correct starting cannot be guaranteed by the main station and level difference protection coordination type self-healing under the condition of fixed value mismatch, and fault line self-healing is achieved.
When a feeder line has a fault in an abnormal operation mode (namely, an original open-loop point switch is changed to other positions), an automatic switch with a step difference protection on the feeder line can set the set action current/time limit trip in a normal operation mode, if the fault occurs in the later stage of the original open-loop point (as shown in figure 2), the fault is isolated by the step difference switch with the minimum action time limit, and then the automatic main station can analyze the fault and position a fault interval according to information such as switch opening/closing, locking signals, protection action signals and topological structures. Before the fault point, the action time limit values of the switch 5, the switch 6 and the switch 11 are all set to be 0 second, and the overcurrent alarm action time limit values of the switch 4, the switch 12 and the switch 10 are all set to be 0 second, so that three switches of the switch 5, the switch 6 and the switch 11 cause fault tripping due to consistent action time limit during the fault, the switch 4, the switch 12 and the switch 10 also reach the overcurrent alarm time limit and send an overcurrent alarm, and the switch 9 closest to the fault point does not send any alarm and trip information because the switch 9 does not reach the protection action time limit of 0.15S. At this time, if the self-healing fault location and action logic of the master station is adopted, the fault section is located between the switch 10 and the switch 9, the switch 10 is an upstream boundary switch, the switch 9 is a downstream boundary switch, the subsequent self-healing action logic sends a remote control command to separate the switch 10 and the switch 9, then the switch 5, the switch 6 and the switch 11 are gradually restored, the power supply of the upstream non-fault area of the line is restored, and the downstream sends a command to close the switch 7 to restore the power supply of the user load between the switch 7 and the switch 8. In addition, because the existing automatic circuit breakers for the distribution network lines have long action time from the line failure to the tripping disconnection of the circuit breaker, the time is about 100ms, and a certain time allowance needs to be reserved for the switch level difference, and an effective protection cooperation needs to be formed between the switch level difference and the protection of a superior bus and a main transformer, the circuit cannot be protected by unlimited input of multi-level time level difference switches on the same line. The protection time difference set by a bus feed-out switch (switch 1) of a general transformer substation is 0.3 second (namely 300ms or 0.3s), the protection time difference is matched according to the first-level difference of 100ms or 150ms, only 2-3 switches which can be switched into protection tripping on a circuit can be switched into, and if more than 3 automatic circuit breakers on the circuit are arranged, only protection warning can be switched into for indicating whether fault current flows through the switch node. Therefore, it is urgently needed to provide a power distribution network main station and level difference protection coordination type self-healing method for effectively avoiding the technical problem that the fault area is wrongly located by a main station self-healing program under the condition of switch override tripping caused by level difference matching mismatch after the feeder line operation mode is changed.
Disclosure of Invention
The invention provides a power distribution network main station and level difference protection coordination type self-healing method, which is used for effectively avoiding the technical problem that a main station self-healing program wrongly positions a fault area under the condition of switch override tripping caused by level difference matching mismatching after a feeder line operation mode is changed.
In view of this, the present invention provides a power distribution network master station and level difference protection coordination type self-healing method, including:
predefining a plurality of feeders which are put into the main station and self-healing of the level difference protection coordination type into a feeder group according to the connection relation of the feeders, predefining a connection switch in the feeder group, and enabling all circuits in the feeder group to be in a non-loop closing operation state;
putting a level difference protection automatic switch into a feeder line group, wherein the level difference protection automatic switch comprises a level difference protection alarm automatic switch and a level difference protection tripping automatic switch, the overcurrent alarm action time limit and the zero sequence action alarm time limit of the level difference protection automatic switch are both set to be 0 second, and when the overcurrent protection action time limit is not 0 second, the level difference protection tripping automatic switch records the level difference protection tripping automatic switch with the overcurrent protection action time limit being not 0 second into a main station and level difference protection system type self-healing program of an SCADA (supervisory control and data acquisition);
when the differential protection distribution line in the feeder line group breaks down, the main station and the differential protection system type self-healing program search according to the electrical topological relation immediately before the fault tripping, check a tripping switch with the electrical connection relation farthest from a tripping bus, and judge whether the electrical connection relation from the farthest tripping switch to a power supply bus before the tripping passes through a predefined interconnection switch;
if the electrical connection relation between the farthest trip switch and the power supply bus before tripping flows through a predefined interconnection switch, searching the last trip switch or overcurrent alarm switch from the side, far away from the power supply of the power grid, of the differential protection trip automatic switch or the differential protection alarm automatic switch as a fault point upstream boundary switch according to the power supply path topology, then continuing searching downstream of the power supply to find the first switch without trip and overcurrent alarm at the downstream, judging whether the switch is a switch with action time limit not 0, if so, continuing searching the switch without trip and overcurrent alarm at the downstream as a fault point downstream boundary switch, otherwise, taking the first switch without trip and overcurrent alarm at the downstream as a fault point downstream boundary switch, and taking the interval between the upstream boundary switch and the downstream boundary switch as the whole fault area;
if the electrical connection relation between the farthest trip switch and the power supply bus before tripping does not flow through the predefined interconnection switch, searching the last trip switch or overcurrent alarm switch from the level difference protection trip switch or the level difference alarm switch to the side far away from the power supply of the power grid according to the power supply path topology to be used as a fault point upstream boundary switch, then continuing searching downstream of the power supply to find the first switch without trip or overcurrent alarm at the downstream to be used as a fault point downstream boundary switch, and taking the interval between the upstream boundary switch and the downstream boundary switch as the whole fault area;
after the whole fault area is determined, a master station sends a remote control command to break a fault downstream switch to realize complete isolation of a fault area, an automatic master station sends a remote control command to close an upstream multiple trip isolation switch, an open-loop point switch of a non-fault area and an interconnection switch of the non-fault area, and a power supply is introduced from an opposite side line to recover power supply of the non-fault area so as to complete self-healing.
Optionally, the step difference protection tripping automatic switch with the overcurrent protection action time limit of not 0 second is recorded into a main station and step difference protection system type self-healing program of the SCADA in a system notification or manual recording mode.
According to the technical scheme, the embodiment of the invention has the following advantages:
according to the distribution network main station and level difference protection coordination type self-healing method provided by the invention, by setting information such as switch information, feeder group locking information, feeder group open-loop closed-loop information, feeder group input and exit and the like which are input into self-healing, under the condition of line tripping fault, a fault area is automatically searched, and the technical problem that a main station self-healing program wrongly positions the fault area under the condition of switch override tripping caused by level difference matching mismatch after the feeder operation mode is changed is effectively avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a first schematic diagram of a feeder group in which a self-healing feeder group of a centralized distribution network of a master station fails;
fig. 2 is a feeder group schematic diagram ii of a master station centralized distribution network self-healing feeder group which fails;
fig. 3 is a schematic diagram of a main station centralized distribution network self-healing feeder group in the embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For convenience of understanding, referring to fig. 3, an embodiment of the present invention provides a power distribution network master station and level difference protection coordination type self-healing method, including:
step 101, predefining a plurality of feeders which are put into a main station and self-healing with level difference protection coordination according to a feeder connection relation into a feeder group, predefining a connection switch in the feeder group, and enabling all lines in the feeder group to be in a non-loop closing operation state.
102, putting a level difference protection automatic switch into the feeder line group, wherein the level difference protection automatic switch comprises a level difference protection alarm automatic switch and a level difference protection tripping automatic switch, the overcurrent alarm action time limit and the zero sequence action alarm time limit of the level difference protection alarm automatic switch are both set to be 0 second, and when the overcurrent protection action time limit is not 0 second, the level difference protection tripping automatic switch records the level difference protection tripping automatic switch with the overcurrent protection action time limit being not 0 second into a main station and level difference protection system type self-healing program of the SCADA.
103, when the differential protection distribution line in the feeder line group has a fault, searching by the main station and the differential protection system type self-healing program according to the electrical topological relation immediately before the fault tripping, checking a tripping switch with the electrical connection relation farthest from the tripping bus, judging whether the electrical connection relation from the farthest tripping switch to the power supply bus before the tripping passes through a predefined interconnection switch, if so, executing step 104, and if not, executing step 105.
104, if the electrical connection relation between the farthest trip switch and the power supply bus before tripping flows through the predefined interconnection switch, searching the last trip switch or overcurrent alarm switch from the side of the level difference protection trip automatic switch or the level difference protection alarm automatic switch far away from the power supply of the power grid as a fault point upstream boundary switch according to the power supply path topology, then continuing to search downstream of the power supply to find the first switch without trip and overcurrent alarm at the downstream, and judging whether the switch is a switch with action time limit not 0, if so, continuing to find a switch without trip and overcurrent alarm at the downstream as a fault point downstream boundary switch, executing step 106, otherwise, taking the first switch without trip and overcurrent alarm at the downstream as a fault point downstream boundary switch, and taking the interval between the upstream boundary switch and the downstream boundary switch as the whole fault area, step 106 is performed.
And 105, if the electrical connection relation between the farthest trip switch and the power supply bus before tripping does not pass through the predefined interconnection switch, searching the last trip switch or overcurrent alarm switch from the level difference protection trip switch or the level difference alarm switch to the side far away from the power supply of the power grid according to the topology of the power supply path as a fault point upstream boundary switch, then continuing searching the downstream of the power supply to find the first switch without trip or overcurrent alarm at the downstream as a fault point downstream boundary switch, taking the interval between the upstream boundary switch and the downstream boundary switch as the whole fault area, and executing step 106.
And 106, after the whole fault area is determined, the master station sends a remote control command to break a fault downstream switch to realize complete isolation of a fault area, the automatic master station sends a remote control command to close an upstream multiple trip isolation switch, an open loop point switch of a non-fault area and an interconnection switch of the non-fault area, and a power supply is introduced from an opposite side line to recover power supply of the non-fault area so as to finish self-healing.
To further specifically explain the implementation process of the present invention, please refer to fig. 3, 2 dry feeders (F01, F02) that are put into the main station and the level difference protection coordination self-healing are predefined as a feeder group according to the feeder connection relationship, a connection switch (switch 6) is predefined, and the lines in the feeder group are in the non-loop closing operation state, and the open loop point is at the switch 7, that is, the feeders F01, F02 are in the non-normal operation state.
The protection fixed value of the automatic switches (switches 1, 3, 5, 6, 7, 9 and 11) which are put into the feeder group and are tripped in a protection mode is set and set only according to the original setting calculation rule of the level difference protection fixed value, a reasonable time level difference or an overcurrent level difference is formed between every two protection level difference switches, the time level difference is matched as shown in figure 3, the time level difference of the switch 1 and the switch 7 is 0.3S, the time level difference of the switch 3 and the switch 9 is 0.15S, and the time level difference of the switch 5, the switch 11 and the switch 6 is 0S.
The overcurrent alarm action time limit and the zero sequence alarm time limit of the automatic switch which is put into protection alarm are all set to be 0 second, namely the overcurrent alarm action time limit and the zero sequence alarm time limit of the switches 2, 4, 8, 10 and 12 are all set to be 0 second.
If the limit value of the overcurrent protection action of the automatic switch which is put into protection tripping is not 0 second, the automatic switch needs to be recorded into the SCADA master station self-healing program in a mode of system notification or manual recording, namely, the switches 1, 3, 7 and 9 are recorded into the SCADA master station self-healing program and are used as special marks.
When the differential protection distribution line has a fault (bus fault between the switches 8 and 9), the differential switches 5, 6 and 11 can all perform protection action tripping due to consistent fault time limit and send out protection action alarm, the switches 2, 4, 10 and 12 can all send out protection action alarm due to 0s fault time limit, the main station and the differential protection coordination type self-healing program should search according to the electrical topological relation immediately before the fault tripping, check the trip switch (switch 10) with the electrical connection relation farthest from the bus, judge whether the electrical connection relation between the switch 10 and the power supply bus of the feeder F01 before the tripping flows through the predefined tie switch (switch 6) or not, and according to the judgment result.
If yes, according to the topology of a power supply path, searching the last tripping switch 10 from a level difference protection tripping switch or a level difference alarm switch to the side far away from the power supply of the power grid, then continuing searching to the downstream of the power supply, searching the first tripping-free and overcurrent-free alarm switch 9 at the downstream, judging that the switch 9 is a switch with the action time limit not being 0, and continuing searching to the downstream to find a tripping-free and overcurrent-free alarm switch 8 as a downstream boundary switch of a fault point; the section between the switches 10 to 8, which is the boundary switch between the upstream and downstream, is defined as the entire fault region.
If not, according to the power supply path topology, searching the last trip switch or overcurrent alarm switch from the level difference protection trip switch or the level difference alarm switch to the side far away from the power supply of the power grid as a fault point upstream boundary switch, then continuing searching to the downstream of the power supply, finding the first switch without trip or overcurrent alarm in the downstream as a fault point downstream boundary switch, and taking the interval between the upstream boundary switch and the downstream boundary switch as the whole fault area.
After the whole fault area is determined, a master station sends a remote control instruction to break a downstream switch 8 with a fault to realize complete isolation of a fault interval, an automatic master station sends a remote control instruction to close switches (switches 5, 6 and 11) with upstream multiple tripping isolation and an open-loop point switch 7 with a non-fault area, and a power supply is introduced from an opposite side line to restore the power supply of the non-fault area (the area between the switch 7 and the switch 8).
And the self-healing action of the master station is finished.
According to the distribution network main station and level difference protection coordination type self-healing method provided by the invention, by setting information such as switch information, feeder group locking information, feeder group open-loop closed-loop information, feeder group input and exit and the like which are input into self-healing, under the condition of line tripping fault, a fault area is automatically searched, and the technical problem that a main station self-healing program wrongly positions the fault area under the condition of switch override tripping caused by level difference matching mismatch after the feeder operation mode is changed is effectively avoided.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (2)
1. A distribution network main station and level difference protection coordination type self-healing method is characterized by comprising the following steps:
predefining a plurality of feeders which are put into the main station and self-healing of the level difference protection coordination type into a feeder group according to the connection relation of the feeders, predefining a connection switch in the feeder group, and enabling all circuits in the feeder group to be in a non-loop closing operation state;
putting a level difference protection automatic switch into a feeder line group, wherein the level difference protection automatic switch comprises a level difference protection alarm automatic switch and a level difference protection tripping automatic switch, the overcurrent alarm action time limit and the zero sequence action alarm time limit of the level difference protection automatic switch are both set to be 0 second, and when the overcurrent protection action time limit is not 0 second, the level difference protection tripping automatic switch records the level difference protection tripping automatic switch with the overcurrent protection action time limit being not 0 second into a main station and level difference protection system type self-healing program of an SCADA (supervisory control and data acquisition);
when the differential protection distribution line in the feeder line group breaks down, the main station and the differential protection system type self-healing program search according to the electrical topological relation immediately before the fault tripping, check a tripping switch with the electrical connection relation farthest from a tripping bus, and judge whether the electrical connection relation from the farthest tripping switch to a power supply bus before the tripping passes through a predefined interconnection switch;
if the electrical connection relation between the farthest trip switch and the power supply bus before tripping flows through a predefined interconnection switch, searching the last trip switch or overcurrent alarm switch from the side, far away from the power supply of the power grid, of the differential protection trip automatic switch or the differential protection alarm automatic switch as a fault point upstream boundary switch according to the power supply path topology, then continuing searching downstream of the power supply to find the first switch without trip and overcurrent alarm at the downstream, judging whether the switch is a switch with action time limit not 0, if so, continuing searching the switch without trip and overcurrent alarm at the downstream as a fault point downstream boundary switch, otherwise, taking the first switch without trip and overcurrent alarm at the downstream as a fault point downstream boundary switch, and taking the interval between the upstream boundary switch and the downstream boundary switch as the whole fault area;
if the electrical connection relation between the farthest trip switch and the power supply bus before tripping does not flow through the predefined interconnection switch, searching the last trip switch or overcurrent alarm switch from the level difference protection trip switch or the level difference alarm switch to the side far away from the power supply of the power grid according to the power supply path topology to be used as a fault point upstream boundary switch, then continuing searching downstream of the power supply to find the first switch without trip or overcurrent alarm at the downstream to be used as a fault point downstream boundary switch, and taking the interval between the upstream boundary switch and the downstream boundary switch as the whole fault area;
after the whole fault area is determined, a master station sends a remote control command to break a fault downstream switch to realize complete isolation of a fault area, an automatic master station sends a remote control command to close an upstream multiple trip isolation switch, an open-loop point switch of a non-fault area and an interconnection switch of the non-fault area, and a power supply is introduced from an opposite side line to recover power supply of the non-fault area so as to complete self-healing.
2. The power distribution network master station and level difference protection coordination type self-healing method according to claim 1, characterized in that a level difference protection tripping automatic switch with an overcurrent protection action time limit of not 0 second is logged into a master station and level difference protection system type self-healing program of an SCADA (supervisory control and data acquisition) through a system notification or manual logging mode.
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| CN114094554B (en) * | 2021-12-02 | 2023-06-30 | 广东电网有限责任公司 | Method and related device for preventing error isolation by master station in-situ cooperative self-healing |
| CN114285010B (en) * | 2021-12-22 | 2024-02-20 | 苏州电力设计研究院有限公司 | Circuit protection adjusting system of self-adaptive grounding mode |
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