CN114977125A - Security protection control method, system, equipment and storage medium for power distribution network - Google Patents
Security protection control method, system, equipment and storage medium for power distribution network Download PDFInfo
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- CN114977125A CN114977125A CN202210546817.3A CN202210546817A CN114977125A CN 114977125 A CN114977125 A CN 114977125A CN 202210546817 A CN202210546817 A CN 202210546817A CN 114977125 A CN114977125 A CN 114977125A
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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
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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
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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- 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
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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Abstract
The invention provides a safety protection control method, a system, equipment and a storage medium for a power distribution network, wherein the safety protection control method comprises the following steps: when the power distribution network has a fault, starting protection setting by a circuit breaker, and matching with a section switch and an interconnection switch to carry out fault section isolation and non-fault area power supply recovery; the circuit breakers are arranged at the joints of all levels of the power distribution network and are used for carrying out protection setting on all levels of the power distribution network; the section switch is arranged on a main line of the power distribution network, and the interconnection switch is arranged between the two feeders. The power supply recovery system has the advantages that the circuit breakers are arranged at different positions, the power failure of only a fault section can be realized, the power supply recovery of a non-fault section can be realized through the cooperation of the reclosing switch, the section switch and the interconnection switch, and the problems of long fault processing time and wide power failure range generated when a power distribution network is in fault in the prior art are solved.
Description
Technical Field
The invention relates to the field of fault processing of a power distribution network, in particular to a safety protection control method, a system, equipment and a storage medium of the power distribution network.
Background
The safety protection configuration and fault handling modes of the power distribution network are generally divided into a communication-dependent mode and a communication-independent mode. The fault processing mode independent of communication comprises a reclosing and sectionalizer matching mode and a multi-stage protection matching mode. At present, many cities and towns or rural areas have no communication condition or reliable communication condition, and the two modes are mostly adopted. The two modes are not provided with communication conditions, and are generally only suitable for power distribution networks with fixed grid structures and relatively single operation modes. And the network with a hand-pulled ring shape and large branch lines is a common power distribution network topology form at present.
In the two communication-free fault processing modes, the reclosing and sectionalizer matching mode is only relied on, under the condition of the fault of the branch line and the user, the section of the main line part loses power, the fault branch line cannot be isolated simply, multiple switching operations are needed, the fault processing time is long, and the power failure range is wide; the multi-stage protection matching mode is only relied on, under the condition of a main line fault, the power failure of the whole line can be caused, the power failure range is wide, and under the condition of an instantaneous fault, unnecessary power failure can be caused.
Disclosure of Invention
In order to solve the problems of long fault processing time and wide power failure range generated when the power distribution network is in fault in the prior art, the invention provides a safety protection control method of the power distribution network, which comprises the following steps:
when the power distribution network has a fault, starting protection setting by a circuit breaker, and matching with a section switch and a contact switch to carry out fault section isolation and non-fault area power supply recovery;
the circuit breakers are arranged at the joints of all levels of the power distribution network and are used for protecting all levels of the power distribution network;
the section switch is arranged on a main line of the power distribution network, and the interconnection switch is arranged between the two feeders.
Optionally, each level of the power distribution network at least includes two or more of the following: subscribers, large branch lines and trunk lines; carry out protection setting at every level to the distribution network, include:
when each level of the power distribution network comprises users, configuring current quick-break protection for a circuit breaker installed at the users, and setting timing overcurrent protection with action duration not less than a time level difference;
when each level of the power distribution network comprises a large branch line, configuring time-limited quick-break protection of a time level difference for a breaker installed at a line outlet end of the large branch line, setting action duration as timed overcurrent protection of the time level difference, and configuring reclosing times and reclosing duration times of set times;
when each level of the power distribution network comprises a main line, a breaker arranged at a main line outlet end is provided with current quick-break protection, time-limited quick-break protection, timing overcurrent protection and reclosing for a set number of times with a set duration.
Optionally, when the distribution network breaks down, the circuit breaker starts the protection setting, and cooperates with the section switch and the interconnection switch to isolate the fault section and recover the power supply of the non-fault area, including:
when a fault occurs at a user, a circuit breaker arranged at the user starts a current quick-break protection action to complete power failure of a fault section and power restoration of a non-fault area;
when a fault occurs in a large branch line, a circuit breaker installed at the outlet end of the large branch line starts a time-limited quick-break protection action, reclosing is carried out after a set time interval, whether the circuit breaker reclosing is successful or not is determined based on the nature of the fault, the power failure of a fault section is completed, and the power supply of a non-fault area is recovered;
when a fault occurs in a main line, a breaker arranged at a main line outlet end starts a current quick-break protection action, the breaker is reclosed, the section switch and the tie switch are reclosed after the interval is set for a long time, whether the breaker is reclosed, the section switch is reclosed and the tie switch is successful or not is determined based on fault properties, the power failure of a fault section is completed, and the power supply recovery of a non-fault area is completed.
Optionally, when a fault occurs at a user, a circuit breaker installed at the user performs a current quick-break protection action to complete power failure of a fault section, and power restoration of a non-fault area includes:
when a fault occurs at a user, a circuit breaker arranged at the user starts current quick-break protection, the circuit breaker is disconnected, timing overcurrent protection lasting for a time level difference is started, a fault section is powered off, and power supply of a non-fault area is recovered.
Optionally, the determining whether the circuit breaker reclosing is successful based on the nature of the fault, completing power failure of the fault section, and recovering power supply of the non-fault area includes:
when the fault is a transient fault, the circuit breaker installed at the outlet end of the large branch line is successfully reclosed, and the downstream area of the outlet end of the large branch line recovers power supply;
when the fault is a permanent fault, the breaker installed at the outlet end of the large branch line is tripped again, the downstream area of the outlet end of the large branch line loses power, and the main line supplies power normally.
Optionally, the determining, based on the fault property, whether the circuit breaker reclosing, the section switch reclosing and the tie switch are successful, completing power failure of the fault section, and recovering power supply in a non-fault area includes:
when the fault is an instantaneous fault, the breaker installed at the outlet end of the main line is successfully switched on, and the voltage-time section switch installed on the main line is also successfully switched on after the set time length is reached, so that the power supply of the whole line is recovered;
when the fault is a permanent fault, fault isolation and main line upstream area power supply are carried out by a circuit breaker installed at a main line outlet end and a section switch on the main line, and the main line downstream area power supply is restored by the interconnection switch.
Optionally, the fault isolation and the regional power supply at the upstream of the main line are performed by a circuit breaker installed at the outlet end of the main line and a section switch on the main line, and the method includes:
the circuit breaker arranged at the outlet end of the main line and the section switch on the main line are opened again, the section switch is switched off and closed in a voltage-losing mode within a switch closing confirmation time limit, and the other section switch arranged on the main line is switched off and closed in a rapid voltage-losing mode within a switch voltage-losing confirmation time limit instantly when the voltage is released, so that fault isolation is realized by closing and closing; when the set duration is reached, the circuit breakers installed at the outlet ends of the main lines are overlapped again, and the power supply in the upstream area of the main lines is recovered.
Optionally, said and recovering mains downstream area power supply from said tie switch comprises:
and starting delay switching-on after the single side of a contact switch between the two feeders loses power, and closing after the set delay time is reached to restore the power supply of the downstream area of the main line.
Optionally, the section switch is a voltage-time type section switch.
In another aspect, the present invention further provides a system for controlling safety protection of a power distribution network, including:
the control module is used for starting protection setting by a circuit breaker when the power distribution network has a fault and carrying out fault section isolation and non-fault area power supply recovery by matching with a section switch and an interconnection switch;
the circuit breakers are arranged at the joints of all levels of the power distribution network and are used for carrying out protection setting on all levels of the power distribution network;
the section switch is arranged on a main line of the power distribution network, and the interconnection switch is arranged between the two feeders.
Optionally, the control module includes: the protection setting submodule and the fault control submodule are connected;
the protection setting submodule is used for carrying out protection setting on circuit breakers arranged at all levels of the power distribution network;
and the fault control submodule is used for starting the protection setting of the circuit breaker when a fault occurs, and completing the power failure of a fault section and the power restoration of a non-fault area.
Optionally, each level of the power distribution network at least includes two or more of the following: subscribers, large branch lines and trunk lines;
the protection setting submodule includes: a first setting unit, a second setting unit and a third setting unit;
the first setting unit is used for configuring current quick-break protection for a circuit breaker installed at a user when each level of the power distribution network comprises the user, and setting timing overcurrent protection with action duration not less than a time level difference;
the second setting unit is used for configuring time-limited quick-break protection of a time level difference for a circuit breaker installed at a wire outlet end of the large branch line when each level of the power distribution network comprises the large branch line, setting action duration as timing overcurrent protection of the time level difference, and configuring reclosing times and reclosing duration times of set times;
and the third setting unit is used for configuring current quick-break protection, time-limited quick-break protection, timing overcurrent protection and reclosing for a set number of times of a duration set time for a breaker installed at a main line outlet end when each level of the power distribution network comprises a main line.
Optionally, the fault control sub-module includes:
the user control unit is used for starting a current quick-break protection action by a circuit breaker installed at a user when a fault occurs at the user, so that the power failure of a fault section and the power restoration of a non-fault area are completed;
the large branch line control unit is used for starting a time-limited quick-break protection action by a breaker arranged at a wire outlet end of the large branch line when a fault occurs on the large branch line, reclosing after a set time interval, determining whether the reclosing of the breaker is successful or not based on the property of the fault, completing the power failure of a fault section and recovering the power supply of a non-fault area;
and the main line control unit is used for starting a current quick-break protection action by a circuit breaker installed at a main line outlet end when a fault occurs in a main line, matching with the voltage loss tripping of the section switch, reclosing the circuit breaker, the section switch and the tie switch after a set time interval, determining whether the circuit breaker reclosing, the section switch reclosing and the tie switch are successful or not based on fault properties, completing the power failure of a fault section and recovering the power supply of a non-fault area.
Optionally, the user control unit is specifically configured to:
when a fault occurs at a user, a circuit breaker arranged at the user starts current quick-break protection, the circuit breaker is disconnected, timing overcurrent protection lasting for a time level difference is started, a fault section is powered off, and power supply of a non-fault area is recovered.
In another aspect, the present application further provides a safety protection power distribution system of a power distribution network, including: circuit breakers, sectionalizers and tie switches;
the circuit breakers are arranged at the joints of all levels of the power distribution network and are used for carrying out protection setting on all levels of the power distribution network;
the section switch is arranged on a main line of the power distribution network, and the interconnection switch is arranged between the two feeders and is used for matching with the breaker to isolate fault sections and restore power supply to non-fault areas.
Optionally, each level of the power distribution network at least comprises two or more of the following; a subscriber, a large branch line and a trunk line;
when each level of the power distribution network comprises users, the circuit breaker is arranged at the users;
when each level of the power distribution network comprises a large branch line, the circuit breaker is arranged at the outlet end of the large branch line;
when each level of the power distribution network comprises a main trunk line, the circuit breaker is arranged at the outlet end of the large branch line.
In yet another aspect, the present application further provides a computing device comprising: one or more processors;
a processor for executing one or more programs;
when the one or more programs are executed by the one or more processors, a method for controlling safety protection of a power distribution network as described above is implemented.
In still another aspect, the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed, the method for controlling the safety protection of the power distribution network is implemented.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a safety protection control method of a power distribution network, which comprises the following steps: when the power distribution network has a fault, starting protection setting by a circuit breaker, and matching with the section switch and the interconnection switch to carry out fault section isolation and non-fault area power supply recovery; the circuit breakers are arranged at the joints of all levels of the power distribution network and are used for carrying out protection setting on all levels of the power distribution network; the section switch is arranged on a main line of the power distribution network, and the interconnection switch is arranged between the two feeders. The power supply recovery system has the advantages that the circuit breakers are arranged at different positions, the power failure of only a fault section can be realized, the power supply recovery of a non-fault section can be realized through the cooperation of the reclosing switch, the section switch and the interconnection switch, and the problems of long fault processing time and wide power failure range generated when a power distribution network is in fault in the prior art are solved.
Drawings
Fig. 1 is a schematic diagram of a power distribution network with a hand-pulled ring shape and a large branch line according to the present invention.
Detailed Description
For the problem of the non-communication fault processing mode in the prior art, under the condition of no communication, a common hand-in-hand annular power distribution network with a large branch line needs to be researched, so that the safety protection configuration and the fault processing method which are integrated by the two non-communication modes are expected to realize the minimum region isolation of the fault in the shortest time.
The invention provides a safety protection control method for a power distribution network, which realizes power supply recovery of a fault section isolation area and a non-fault area through the cooperation of reclosure, section switches and protection of each level. Based on the method, under the conditions of user faults and branch line faults, only the fault user or the fault branch line is powered off, and the main line is continuously supplied with power; under the condition of a main line fault, only the fault section is powered off, and the non-fault section can realize power supply recovery through the cooperation of a reclosing switch, a section switch and a tie switch. The method is independent of communication and can isolate faults to a minimum area.
Example 1:
a safety protection control method for a power distribution network comprises the following steps:
step 1: when the power distribution network has a fault, starting protection setting by a circuit breaker, and matching with a section switch and an interconnection switch to carry out fault section isolation and non-fault area power supply recovery;
the circuit breakers are arranged at the joints of all levels of the power distribution network and are used for protecting all levels of the power distribution network;
the section switch is arranged on a main line of the power distribution network, and the interconnection switch is arranged between the two feeders.
The invention provides a safety protection control method of a power distribution network, aiming at the power distribution network which is in a hand-pulling annular shape and contains large branch lines. To implement this method, the following configuration of power distribution network security protection is required.
Optionally, before step 1, further comprising:
and a user demarcation circuit breaker is installed at a user position, a branch line outgoing circuit breaker is installed at a large branch line outgoing end, and a main line outgoing circuit breaker is installed at a main line outgoing end. In addition, section switches (load switches) are distributed and mounted on the main line, and the two feeders are connected through the interconnection switch.
The circuit breakers at different positions, the tie switches and the section switches are respectively configured with the following functions, wherein the circuit breaker at the user position is called a user demarcation circuit breaker, the circuit breaker at the outlet end of the large branch line is called a large branch line outlet circuit breaker, and the circuit breaker at the outlet end of the main line is called a main line outlet circuit breaker:
circuit breaker is demarcated to the user:
(1) and current quick-break protection and timing overcurrent protection are configured.
1) Current quick-break protection: the action time is 0 s; the setting constant value needs to be capable of reliably removing metallic short-circuit faults occurring at the outlet of the user line and avoiding excitation inrush current and low-voltage side faults of a carried distribution transformer.
2) Timing overcurrent protection: the action time is not less than Delta T; the setting fixed value ensures reliable action when the end of the protection range of the segment has metallic short circuit fault and avoids the maximum load current.
Aiming at a breaker for a large branch line outgoing line:
(1) 1 reclosing is configured, and the reclosing time is 1 s.
(2) And configuring time-limited quick-break protection and timing overcurrent protection.
1) Time-limited quick-break protection: setting the action time limit as a time step difference Delta T; the setting value is to ensure that the fault can be reliably removed when the branch outlet is in fault, and the excitation inrush current of the carried distribution transformer and the fault of the low-voltage side need to be avoided.
2) Timing overcurrent protection: the action time limit is increased by a time step difference delta T compared with the timing overcurrent protection time limit of the user demarcation circuit breaker; the setting value is required to ensure reliable action when a metallic short-circuit fault occurs at the tail end of the protection range of the segment, and the maximum load current is required to be avoided.
Aiming at a main line outgoing breaker:
(1) and 2 reclosings are configured, and the reclosing time is 1 s.
(2) And current quick-break protection, time-limited quick-break protection and timing overcurrent protection are configured.
1) Current quick-break protection: protection action time 0 s; the principle of setting the fixed value can be generally set according to the reliable tripping operation when the fault is 1-2 km away from the bus.
2) Time-limited quick-break protection: the protection action time limit is increased by a time step delta T compared with the branch circuit breaker time limit quick-break protection action time limit; the excitation inrush current and low-voltage side faults of a lower-level distribution transformer need to be avoided during fixed value setting, and the specific value can be set according to 2 times of rated current of the connected distribution transformer.
3) Timing overcurrent protection: the protection action time limit is increased by a time step delta T compared with the timing overcurrent protection action time limit of the branch circuit breaker; the fixed value setting is to ensure reliable action when a metallic short circuit fault occurs at the tail end of the protection range of the section, and the maximum load current is avoided.
The value of delta T is as small as possible on the premise of meeting the reliable fault removal, and can be 200ms generally.
The section switch on the main line adopts a voltage-time section switch, has the characteristics of 'one side has a voltage delay switching-on and a non-voltage switching-off', and is configured with X time limit and Y time limit, wherein the two time limits are respectively set as follows:
and (4) time limit of X: and the switch has a pressure confirmation time limit which is set to 7 s. When the time limit is reached, the switch is closed. And if the switch loses voltage again within the X time limit, the switch is closed.
Y time limit: and (5) setting the switch closing confirmation time limit to be 5 s. And if the switch is switched on and then is switched off in a voltage loss manner within Y time limit, the switch is switched on in a locking manner.
The tie switch is configured in the following mode: keeping the two sides open when power is available, starting delayed closing when power is unavailable on one side, closing when power is available instantaneously on one side in the delay process, and delaying X L The whole was set to 45 s.
When the distribution network breaks down in step 1, the circuit breaker starts protection setting, and cooperates with the section switch and the interconnection switch to carry out fault section isolation and non-fault area power supply recovery, specifically including:
when a fault occurs at a user, a circuit breaker arranged at the user performs a current quick-break protection action to complete power failure of a fault section and power restoration of a non-fault area;
when a fault occurs in a large branch line, a breaker arranged at the outlet end of the large branch line performs time-limited quick-break protection action, reclosing is performed after a set time interval, whether the reclosing of the breaker is successful or not is determined based on the nature of the fault, the power failure of a fault section is completed, and the power supply of a non-fault area is recovered;
when a fault occurs in a main line, a breaker arranged at a main line outlet end performs current quick-break protection action, the breaker is matched with the sectional switch to be subjected to voltage loss tripping, after a set time interval, the breaker is reclosed, the sectional switch and the tie switch are reclosed, whether the breaker is reclosed, the sectional switch is reclosed and the tie switch are successful or not is determined based on fault properties, the power failure of a fault section is completed, and the power supply of a non-fault area is recovered.
When the trouble takes place in user's department, carry out the protection action of current quick break by the circuit breaker of installing in user's department, accomplish to the outage of trouble section, the regional power supply of non-trouble resumes, include:
when a fault occurs at a user, a circuit breaker arranged at the user starts current quick-break protection, the circuit breaker is disconnected, timing overcurrent protection lasting for a time level difference is started, a fault section is powered off, and power supply of a non-fault area is recovered.
The determining whether the circuit breaker is successfully reclosed based on the nature of the fault, completing the power failure of the fault section and the power restoration of the non-fault area comprises the following steps:
when the fault is a transient fault, the circuit breaker installed at the outlet end of the large branch line is successfully reclosed, and the downstream area of the outlet end of the large branch line recovers power supply;
when the fault is a permanent fault, the breaker installed at the outlet end of the large branch line is tripped again, the downstream area of the outlet end of the large branch line loses power, and the main line supplies power normally.
The determining whether the circuit breaker reclosing, the section switch reclosing and the interconnection switch are successful based on the fault property to complete the power failure of the fault section and the power restoration of the non-fault area comprises the following steps:
when the fault is an instantaneous fault, the breaker installed at the outlet end of the main line is successfully switched on, and the voltage-time section switch installed on the main line is also successfully switched on after the set time length is reached, so that the power supply of the whole line is recovered;
when the fault is a permanent fault, fault isolation and main line upstream area power supply are carried out by a breaker installed at a main line outlet end and a section switch on the main line, and the main line downstream area power supply is restored by the interconnection switch.
The said circuit breaker and section switch on the main line that install at the main line outlet terminal carry on the fault isolation and regional power supply of main line upstream, include:
the circuit breaker arranged at the outlet end of the main line and the section switch on the main line are opened again, the section switch is switched off and closed in a voltage-losing mode within a switch closing confirmation time limit, and the other section switch arranged on the main line is switched off and closed in a rapid voltage-losing mode within a switch voltage-losing confirmation time limit instantly when the voltage is released, so that fault isolation is realized by closing and closing; when the set duration is reached, the circuit breakers installed at the outlet ends of the main lines are overlapped again, and the power supply in the upstream area of the main lines is recovered.
And recovering mains downstream area power by said tie switch, comprising:
and starting delay switching-on after the single side of a contact switch between the two feeders loses power, and closing after the set delay time is reached to restore the power supply of the downstream area of the main line.
Based on the power distribution network safety protection configuration, a communication-free fault processing method can be implemented. Under the conditions of user faults and branch line faults, only the fault user or the fault branch line is powered off, and the main line continuously supplies power; under the condition of a main line fault, only the fault section is powered off, and the non-fault section can realize power supply recovery through the cooperation of a reclosing switch, a section switch and a tie switch.
Example 2:
the method of the invention is implemented for the distribution network shown in fig. 1. To implement this method, the following configuration of power distribution network security protection is required.
A user demarcation circuit breaker such as QF3 is installed at a user, branch outlet circuit breakers such as QF2, QF4 and QF5 are installed at a large branch outlet terminal, and main outlet circuit breakers such as QF1 and QF6 are installed at a main outlet terminal. In addition, sectional switches such as QL1 and QL2 are distributed on the main line, and the two feeder lines are connected through a communication switch QL 3. The following functional configurations are respectively performed:
for a user demarcation circuit breaker:
(1) and current quick-break protection and timing overcurrent protection are configured.
1) Current quick-break protection: the action time is 0 s; the setting constant value needs to be capable of reliably removing metallic short-circuit faults occurring at the outlet of a user line and avoiding excitation inrush current and low-voltage side faults of a carried distribution transformer.
2) Timing overcurrent protection: the action time is not less than Delta T; the setting fixed value ensures reliable action when the end of the protection range of the segment has metallic short circuit fault and avoids the maximum load current.
Aiming at a breaker for a large branch line outgoing line:
(1) 1 reclosing is configured, and the reclosing time is 1 s.
(2) And configuring time-limited quick-break protection and timing overcurrent protection.
1) Time-limited quick-break protection: setting the action time limit as a time step difference Delta T; the setting value is to ensure that the fault can be reliably removed when the branch outlet is in fault, and the excitation inrush current of the carried distribution transformer and the fault of the low-voltage side need to be avoided.
2) Timing overcurrent protection: the action time limit is increased by a time step difference delta T compared with the timing overcurrent protection time limit of the user demarcation circuit breaker; the setting value is required to ensure reliable action when a metallic short-circuit fault occurs at the tail end of the protection range of the segment, and the maximum load current is required to be avoided.
Aiming at a main line outgoing breaker:
(1) and 2 reclosings are configured, and the reclosing time is 1 s.
(2) And current quick-break protection, time-limited quick-break protection and timing overcurrent protection are configured.
1) Current quick-break protection: protection action time 0 s; the principle of setting the fixed value can be generally set according to the reliable tripping operation when the fault is 1-2 km away from the bus.
2) Time-limited quick-break protection: the protection action time limit is increased by a time step delta T compared with the time limit quick-break protection action time limit of the branch circuit breaker; the excitation inrush current and low-voltage side faults of a lower-level distribution transformer need to be avoided during fixed value setting, and the specific value can be set according to 2 times of rated current of the connected distribution transformer.
3) Timing overcurrent protection: the protection action time limit is increased by a time step delta T compared with the timing overcurrent protection action time limit of the branch circuit breaker; the fixed value setting is to ensure reliable action when the end of the protection range of the section generates metallic short-circuit fault and avoid the maximum load current.
The value of delta T is as small as possible on the premise of meeting the reliable fault removal, and can be 200ms generally.
The section switch on the main line adopts a voltage-time section switch, has the characteristics of 'one side has a voltage delay switching-on and a non-voltage switching-off', and is configured with X time limit and Y time limit, wherein the two time limits are respectively set as follows:
and (4) time limit of X: and the switch has a pressure confirmation time limit which is set to 7 s. When the time limit is reached, the switch is closed. And if the switch loses voltage again within the X time limit, the switch is closed.
Y time limit: and (5) setting the switch closing confirmation time limit to be 5 s. And if the switch is switched on and then is switched off in a voltage loss manner within Y time limit, the switch is switched on in a locking manner.
The tie switch is configured in the following mode: keeping the two sides open when power is available, starting delayed closing when power is unavailable on one side, closing when power is available instantaneously on one side in the delay process, and delaying X L The whole was set to 45 s.
Based on the configuration, the faults at different positions can be effectively processed:
(1) failure occurs at F2:
and the current at QF3 is quickly cut off to protect the circuit, QF3 is tripped, fault isolation is realized, and other areas are not powered off.
(2) Failure occurs at F1:
and (4) performing time-limited quick-break protection at QF2, tripping QF2, and performing 1 reclosing after 1s interval.
If the fault is a transient fault, the QF2 is successfully superposed, and the power supply of the downstream area of the QF2 is recovered; if the fault is permanent, the QF2 is tripped off again, the area downstream of the QF2 is powered off, and the main line is normally powered.
(3) Failure occurs at F3:
1) the current at QF1 is quickly cut off, QF1 is tripped, and QL1 and QL2 are tripped after voltage loss.
2) After 1s, QF1 is overlapped, and QL1 is switched on after X time limit is met.
If the fault is an instantaneous fault, the reclosing is successful, and the QL2 is switched on after the X time limit is met, so that the power supply of the whole line is recovered. And (6) ending.
If the fault is a permanent fault:
a) closed to the fault point, QF1, QL1 trip out again. When the QL1 loses voltage and opens the brake within Y time limit, the lock closes the brake; and when the QL2 has instantaneous pressure and rapid pressure loss within the X time limit, the closing is locked. Accordingly, fault isolation is achieved.
b) After 1s, QF1 is overlapped for the second time, and power supply is recovered to the area upstream of QL 1.
c) Starting delayed switch-on after single-side power failure of QL3, and delaying X L And then closing, and restoring the power supply of the area downstream of the QL 2.
Example 3:
the invention based on the same inventive concept also provides a safety protection control system of the power distribution network, which comprises:
and the control module is used for starting protection setting by a circuit breaker when the power distribution network fails and matching the section switch and the interconnection switch to carry out fault section isolation and non-fault area power supply recovery.
The control module includes: the protection setting submodule and the fault control submodule are connected;
the protection setting submodule is used for carrying out protection setting on circuit breakers arranged at all levels of the power distribution network;
and the fault control submodule is used for starting the protection setting of the circuit breaker when a fault occurs, and completing the power failure of a fault section and the power restoration of a non-fault area.
Optionally, each level of the power distribution network at least includes two or more of the following: a subscriber, a large branch line and a trunk line; the protection setting submodule includes: a first setting unit, a second setting unit and a third setting unit;
the first setting unit is used for configuring current quick-break protection for a circuit breaker installed at a user and setting timing overcurrent protection with action duration not less than a time level difference;
the second setting unit is used for configuring time-limited quick-break protection of a time level difference for the circuit breaker installed at the outlet end of the large branch line, setting action duration as timed overcurrent protection of the time level difference, and configuring reclosing times and reclosing duration times of set times;
the third setting unit is used for configuring current quick-break protection, time-limited quick-break protection, timing overcurrent protection and reclosing for a set time of a continuous set time length for a circuit breaker installed at a main line outlet end, wherein the action time length of the timing overcurrent protection is two set time lengths.
Optionally, the fault control sub-module includes:
the user control unit is used for carrying out current quick-break protection action by a circuit breaker installed at a user when a fault occurs at the user, so as to complete power failure of a fault section and power restoration of a non-fault area;
the large branch line control unit is used for limiting time and quickly breaking protection actions by a breaker arranged at the outlet end of the large branch line when a fault occurs on the large branch line, and reclosing is carried out after a set time interval;
when the fault is a transient fault, the circuit breaker installed at the outlet end of the large branch line is successfully reclosed, and the downstream area of the outlet end of the large branch line recovers power supply;
when the fault is a permanent fault, the breaker arranged at the outlet end of the large branch line is tripped again, the downstream area of the outlet end of the large branch line loses power, and the main line supplies power normally;
the main line control unit is used for carrying out current quick-break protection action by a circuit breaker arranged at a main line outlet end when a fault occurs in a main line, matching with the voltage loss tripping of the section switch, and reclosing the circuit breaker, the section switch and the interconnection switch after a set time interval;
when the fault is an instantaneous fault, the breaker installed at the outlet end of the main line is successfully switched on, and the voltage-time section switch installed on the main line is also successfully switched on after the set time length is reached, so that the power supply of the whole line is recovered;
when the fault is a permanent fault, fault isolation and main line upstream area power supply are carried out by a circuit breaker installed at a main line outlet end and a section switch on the main line, and the main line downstream area power supply is restored by the interconnection switch.
Optionally, the user control unit is specifically configured to:
when a fault occurs at a user, a circuit breaker arranged at the user starts current quick-break protection, the circuit breaker is disconnected, timing overcurrent protection lasting for a time level difference is started, a fault section is powered off, and power supply of a non-fault area is recovered.
Example 4:
based on the same invention concept, the invention also provides a safety protection power distribution system of the power distribution network, which comprises: circuit breakers, sectionalizers and tie switches;
the circuit breakers are arranged at the joints of all levels of the power distribution network and are used for carrying out protection setting on all levels of the power distribution network;
the section switch is arranged on a main line of the power distribution network, and the interconnection switch is arranged between the two feeders and is used for matching with the breaker to isolate fault sections and restore power supply to non-fault areas.
Optionally, each level of the power distribution network at least comprises two or more of the following; a subscriber, a large branch line and a trunk line;
when each level of the power distribution network comprises users, the circuit breaker is arranged at the users;
when each level of the power distribution network comprises a large branch line, the circuit breaker is arranged at the outlet end of the large branch line;
when each level of the power distribution network comprises a main trunk line, the circuit breaker is arranged at the outlet end of the large branch line.
The circuit breakers at different positions, the tie switches and the section switches are respectively configured with the following functions, wherein the circuit breaker at the user position is called a user demarcation circuit breaker, the circuit breaker at the outlet end of the large branch line is called a large branch line outlet circuit breaker, and the circuit breaker at the outlet end of the main line is called a main line outlet circuit breaker:
circuit breaker is demarcated to the user:
(1) and current quick-break protection and timing overcurrent protection are configured.
1) Current quick-break protection: the action time is 0 s; the setting constant value needs to be capable of reliably removing metallic short-circuit faults occurring at the outlet of the user line and avoiding excitation inrush current and low-voltage side faults of a carried distribution transformer.
2) Timing overcurrent protection: the action time is not less than Delta T; the setting fixed value ensures reliable action when the end of the protection range of the segment has metallic short circuit fault and avoids the maximum load current.
Aiming at a breaker for a large branch line outgoing line:
(1) 1 reclosing is configured, and the reclosing time is 1 s.
(2) And configuring time-limited quick-break protection and timing overcurrent protection.
1) Time-limited quick-break protection: setting the action time limit as a time step difference Delta T; the setting value is to ensure that the fault can be reliably removed when the branch outlet is in fault, and the excitation inrush current of the carried distribution transformer and the fault of the low-voltage side need to be avoided.
2) Timing overcurrent protection: the action time limit is increased by a time step difference delta T compared with the timing overcurrent protection time limit of the user demarcation circuit breaker; the setting value is required to ensure reliable action when a metallic short-circuit fault occurs at the tail end of the protection range of the segment, and the maximum load current is required to be avoided.
Aiming at a main line outgoing breaker:
(1) and 2 reclosings are configured, and the reclosing time is 1 s.
(2) And current quick-break protection, time-limited quick-break protection and timing overcurrent protection are configured.
1) Current quick-break protection: protection action time 0 s; the principle of setting the fixed value can be generally set according to the reliable tripping operation when the fault is 1-2 km away from the bus.
2) Time-limited quick-break protection: the protection action time limit is increased by a time step delta T compared with the branch circuit breaker time limit quick-break protection action time limit; the excitation inrush current and low-voltage side faults of a lower-level distribution transformer need to be avoided during fixed value setting, and the specific value can be set according to 2 times of rated current of the connected distribution transformer.
3) Timing overcurrent protection: the protection action time limit is increased by a time step delta T compared with the timing overcurrent protection action time limit of the branch circuit breaker; the fixed value setting is to ensure reliable action when a metallic short circuit fault occurs at the tail end of the protection range of the section, and the maximum load current is avoided.
The value of delta T is as small as possible on the premise of meeting the reliable fault removal, and can be 200ms generally.
The section switch on the main line adopts a voltage-time type section switch, has the characteristics of 'one-side voltage delay switching-on and non-voltage switching-off', and is configured with X time limit and Y time limit, wherein the two time limits are respectively set as follows:
and (4) time limit of X: and the switch has a pressure confirmation time limit which is set to 7 s. When the time limit is reached, the switch is closed. And if the switch loses voltage again within the X time limit, the switch is closed.
Y time limit: and (5) setting the switch closing confirmation time limit to be 5 s. And if the switch is switched on and then loses voltage and is switched off within the Y time limit, the switch is switched on in a locking mode.
The tie switch is configured in the following mode: keeping the two sides open when power is available, starting delayed closing when power is unavailable on one side, closing when power is available instantaneously on one side in the delay process, and delaying X L The whole was set to 45 s.
Example 5:
based on the same inventive concept, the present invention also provides a computer apparatus comprising a processor and a memory, the memory being configured to store a computer program comprising program instructions, the processor being configured to execute the program instructions stored by the computer storage medium. The Processor may be a Central Processing Unit (CPU), or may be other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable gate array (FPGA) or other Programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc., which is a computing core and a control core of the terminal, and is specifically adapted to implement one or more instructions, and to load and execute one or more instructions in a computer storage medium to implement a corresponding method flow or a corresponding function, so as to implement the steps of the safety protection control method of the power distribution network in the foregoing embodiments.
Example 6:
based on the same inventive concept, the present invention further provides a storage medium, in particular a computer readable storage medium (Memory), which is a Memory device in a computer device and is used for storing programs and data. It is understood that the computer readable storage medium herein can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space storing an operating system of the terminal. Also, one or more instructions, which may be one or more computer programs (including program code), are stored in the memory space and are adapted to be loaded and executed by the processor. It should be noted that the computer-readable storage medium may be a high-speed RAM memory, or may be a non-volatile memory (non-volatile memory), such as at least one disk memory. One or more instructions stored in the computer-readable storage medium may be loaded and executed by the processor to implement the steps of the safety protection control method for the power distribution network in the above embodiments.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention are included in the scope of the claims of the present invention.
Claims (18)
1. A safety protection control method for a power distribution network is characterized by comprising the following steps:
when the power distribution network has a fault, starting protection setting by a circuit breaker, and matching with a section switch and an interconnection switch to carry out fault section isolation and non-fault area power supply recovery;
the circuit breakers are arranged at the joints of all levels of the power distribution network and are used for carrying out protection setting on all levels of the power distribution network; the section switch is arranged on a main line of the power distribution network, and the interconnection switch is arranged between the two feeders.
2. The method of claim 1, wherein each stage of the power distribution network comprises at least two or more of: subscribers, large branch lines and trunk lines; protection setting is carried out at every level to the distribution network, include:
when each level of the power distribution network comprises users, configuring current quick-break protection for a circuit breaker installed at the users, and setting timing overcurrent protection with action duration not less than a time level difference;
when each level of the power distribution network comprises a large branch line, configuring time-limited quick-break protection of a time level difference for a breaker installed at a line outlet end of the large branch line, setting action duration as timed overcurrent protection of the time level difference, and configuring reclosing times and reclosing duration times of set times;
when each level of the power distribution network comprises a main line, a breaker arranged at a main line outlet end is provided with current quick-break protection, time-limited quick-break protection, timing overcurrent protection and reclosing for a set number of times with a set duration.
3. The method of claim 2, wherein the activating of a protection setting by a circuit breaker and the coordinating of a sectionalizer and a tie switch for fault section isolation and non-fault zone power restoration in the event of a fault in the power distribution network comprises:
when a fault occurs at a user, a circuit breaker arranged at the user starts a current quick-break protection action to complete power failure of a fault section and power restoration of a non-fault area;
when a fault occurs in a large branch line, a circuit breaker installed at the outlet end of the large branch line starts a time-limited quick-break protection action, reclosing is carried out after a set time interval, whether the circuit breaker reclosing is successful or not is determined based on the nature of the fault, the power failure of a fault section is completed, and the power supply of a non-fault area is recovered;
when a fault occurs in a main line, a breaker arranged at a main line outlet end starts a current quick-break protection action, the breaker is reclosed, the section switch and the tie switch are reclosed after the interval is set for a long time, whether the breaker is reclosed, the section switch is reclosed and the tie switch is successful or not is determined based on fault properties, the power failure of a fault section is completed, and the power supply recovery of a non-fault area is completed.
4. The method as claimed in claim 3, wherein when the fault occurs at the customer, performing a current snap-off protection action by a circuit breaker installed at the customer to complete the power-off of the fault section and the power restoration of the non-fault area comprises:
when a fault occurs at a user, a circuit breaker arranged at the user starts current quick-break protection, the circuit breaker is disconnected, timing overcurrent protection lasting for a time level difference is started, a fault section is powered off, and power supply of a non-fault area is recovered.
5. The method of claim 3, wherein the determining whether the circuit breaker reclose was successful based on the nature of the fault, completing the power outage to the fault section, and the non-fault area power restoration comprises:
when the fault is a transient fault, the circuit breaker installed at the outlet end of the large branch line is successfully reclosed, and the downstream area of the outlet end of the large branch line recovers power supply;
when the fault is a permanent fault, the breaker installed at the outlet end of the large branch line is tripped again, the downstream area of the outlet end of the large branch line loses power, and the main line supplies power normally.
6. The method of claim 3, wherein the determining whether the breaker reclosing, the sectionalizer reclosing, and tie switch were successful based on the nature of the fault, completing the power outage to the fault section, and the non-fault area power restoration comprises:
when the fault is an instantaneous fault, the breaker installed at the outlet end of the main line is successfully switched on, and the voltage-time section switch installed on the main line is also successfully switched on after the set time length is reached, so that the power supply of the whole line is recovered;
when the fault is a permanent fault, fault isolation and main line upstream area power supply are carried out by a circuit breaker installed at a main line outlet end and a section switch on the main line, and the main line downstream area power supply is restored by the interconnection switch.
7. The method of claim 6 wherein said fault isolating and main line upstream zone powering by circuit breakers and main line sectionalizers mounted on main line outlets comprises:
the circuit breaker arranged at the outlet end of the main line and the section switch on the main line are opened again, the section switch is switched off and closed in a voltage-losing mode within a switch closing confirmation time limit, and the other section switch arranged on the main line is switched off and closed in a rapid voltage-losing mode within a switch voltage-losing confirmation time limit instantly when the voltage is released, so that fault isolation is realized by closing and closing; when the set duration is reached, the circuit breakers installed at the outlet ends of the main lines are overlapped again, and the power supply in the upstream area of the main lines is recovered.
8. The method of claim 6, wherein recovering mains downstream area power by said tie switch comprises:
and starting delay switching-on after the single side of a contact switch between the two feeders loses power, and closing after the set delay time is reached to restore the power supply of the downstream area of the main line.
9. The method of claim 1, wherein the segmented switches are voltage-time type segmented switches.
10. A safety protection control system of a power distribution network is characterized by comprising:
the control module is used for starting protection setting by a circuit breaker when the power distribution network has a fault and carrying out power supply recovery in a fault section and a non-fault area by matching with the section switch and the interconnection switch;
the circuit breakers are arranged at the joints of all levels of the power distribution network and are used for carrying out protection setting on all levels of the power distribution network; the section switch is arranged on a main line of the power distribution network, and the interconnection switch is arranged between the two feeders.
11. The system of claim 10, wherein the control module comprises: the protection setting submodule and the fault control submodule are connected;
the protection setting submodule is used for carrying out protection setting on circuit breakers arranged at all levels of the power distribution network;
and the fault control submodule is used for starting the protection setting of the circuit breaker when a fault occurs, and completing the power failure of a fault section and the power restoration of a non-fault area.
12. The system of claim 11, wherein each stage of the distribution network comprises at least two or more of: subscribers, large branch lines and trunk lines;
the protection setting submodule includes: a first setting unit, a second setting unit and a third setting unit;
the first setting unit is used for configuring current quick-break protection for a circuit breaker installed at a user when each level of the power distribution network comprises the user, and setting timing overcurrent protection with action duration not less than a time level difference;
the second setting unit is used for configuring time-limited quick-break protection of a time level difference for a circuit breaker installed at a wire outlet end of the large branch line when each level of the power distribution network comprises the large branch line, setting action duration as timing overcurrent protection of the time level difference, and configuring reclosing times and reclosing duration times of set times;
and the third setting unit is used for configuring current quick-break protection, time-limited quick-break protection, timed overcurrent protection and reclosing for a set number of times of continuously set duration for a breaker installed at a main line outlet end when each level of the power distribution network comprises a main line.
13. The system of claim 11, wherein the fault control sub-module comprises:
the user control unit is used for starting a current quick-break protection action by a circuit breaker installed at a user when a fault occurs at the user, so as to complete power failure of a fault section and power restoration of a non-fault area;
the large branch line control unit is used for starting a time-limited quick-break protection action by a breaker arranged at a wire outlet end of the large branch line when a fault occurs on the large branch line, reclosing after a set time interval, determining whether the reclosing of the breaker is successful or not based on the property of the fault, completing the power failure of a fault section and recovering the power supply of a non-fault area;
and the main line control unit is used for starting a current quick-break protection action by a circuit breaker installed at a main line outlet end when a fault occurs in a main line, matching with the voltage loss tripping of the section switch, reclosing the circuit breaker, the section switch and the tie switch after a set time interval, determining whether the circuit breaker reclosing, the section switch reclosing and the tie switch are successful or not based on fault properties, completing the power failure of a fault section and recovering the power supply of a non-fault area.
14. The system of claim 13, wherein the user control unit is specifically configured to:
when a fault occurs at a user, a circuit breaker arranged at the user starts current quick-break protection, the circuit breaker is disconnected, timing overcurrent protection lasting for a time level difference is started, a fault section is powered off, and power supply of a non-fault area is recovered.
15. A safety protected power distribution system for a power distribution network, comprising: circuit breakers, sectionalizers and tie switches;
the circuit breakers are arranged at the joints of all levels of the power distribution network and are used for carrying out protection setting on all levels of the power distribution network;
the section switch is arranged on a main line of the power distribution network, and the interconnection switch is arranged between the two feeders and is used for matching with the breaker to isolate fault sections and restore power supply to non-fault areas.
16. The system of claim 15, wherein each stage of the distribution network comprises at least two or more of the following; subscribers, large branch lines and trunk lines;
when each level of the power distribution network comprises users, the circuit breaker is arranged at the user;
when each level of the power distribution network comprises a large branch line, the circuit breaker is arranged at the outlet end of the large branch line;
when each level of the power distribution network comprises a main trunk line, the circuit breaker is arranged at the outlet end of the large branch line.
17. A computer device, comprising: one or more processors;
the processor to store one or more programs;
the one or more programs, when executed by the one or more processors, implement a method of safety protection control for an electrical distribution network according to any one of claims 1 to 9.
18. A computer-readable storage medium, having stored thereon a computer program which, when executed, implements a method of safety protection control of a power distribution network according to any one of claims 1 to 9.
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