CN109004631B - Network-based power distribution network self-adaptive backup protection control method - Google Patents
Network-based power distribution network self-adaptive backup protection control method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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Abstract
The invention discloses a network-based power distribution network self-adaptive backup protection control system, which comprises: set up and distribute net sub-station controlling means of net sub-station department and rather than a plurality of distribution network protection control terminal through network connection, wherein: the distribution network substation control device is used for carrying out self-adaptive identification on network topology connected with the distribution network substation, determining a main protection and backup protection strategy, a backup self-healing strategy, a time sequence and a fixed value, and issuing the main protection and backup protection strategy, the backup self-healing strategy, the time sequence and the fixed value to a distribution network protection control terminal; the distribution network protection control terminal is arranged in each distribution station/switching station of the distribution network and used for transmitting real-time data acquisition information of the distribution station/switching station to the regional substation; receiving breaker/load switch action information sent by the regional substation control device, executing corresponding action, and reporting action execution results; and the time setting result is used for receiving the time setting result issued by the regional substation, and the matching between the backup protection and the main protection is realized. The invention also discloses a corresponding method. By implementing the invention, the fault area can be quickly and accurately cut off and isolated, and the power supply can be timely recovered for the normal area, thereby ensuring the reliability of the power supply.
Description
Technical Field
The invention relates to the technical field of power distribution network protection of a power system, in particular to a power distribution network self-adaptive backup protection control method based on a network.
Background
The power distribution network has the characteristics and changes of various connection forms, frequent change of network structures, numerous and complicated equipment quantity, uneven configuration level, variable operation modes and distributed power supply access, and the protection control is required to be adapted to the change of network connection, the change of equipment configuration and the change of operation modes.
The protection control of the existing power distribution network is independently configured, good matching capability is lacked among the protection control of the existing power distribution network, and the protection control of the existing power distribution network is difficult to automatically adapt to the topology change of the power distribution network. The problems of poor configuration and matching capability and difficulty in following the topological change of a power distribution network and self-adaption caused by the fact that protection formed based on the network is adopted in the current power distribution network can be well solved, but the selectivity and the reliability of the protection are difficult to guarantee under the condition that network faults occur.
At present, the main protection or the backup protection of the power distribution network is mostly configured independently, and a fault removal area and a normal area recovery sequence are selected according to a fixed current constant value and a fixed time constant value. Partial main protection or backup protection of the power distribution network is added into the network to enhance the communication capacity between the protections and enhance the coordination capacity between the protections.
The existing power distribution network backup protection control method mainly has the following defects:
1. the protection control of the existing power distribution network is independently configured, good matching capability is lacked among the protection control of the existing power distribution network, and the protection control of the existing power distribution network is difficult to automatically adapt to the topology change of the power distribution network.
2. The problems of poor configuration and matching capability and difficulty in following the topological change of a power distribution network and self-adaption of the power distribution network can be well solved by adopting network-based protection in the current power distribution network, but the selectivity and the reliability of the protection are difficult to guarantee under the condition of network failure.
Disclosure of Invention
The invention aims to solve the technical problem of providing a network-based power distribution network self-adaptive backup protection control method. The protection has good matching characteristics among all the protections, and can automatically adapt to the change of the topology of the power distribution network; and under the condition of network failure, the selectivity and the reliability of protection can be ensured through the time sequence information of the information transmitted between the protection, so that the failure area can be quickly and accurately cut off and isolated, the power supply can be timely recovered for the normal area, and the power supply reliability can be ensured.
In order to solve the technical problems, the invention provides a network-based power distribution network adaptive backup protection control method, which is implemented in a network-based power distribution network adaptive backup protection control system, wherein the system comprises a distribution network substation control device and a plurality of distribution network protection control terminals connected with the distribution network substation control device through a network, and the method comprises the following steps:
step S10, the distribution network substation control device periodically receives the measurement value of the distribution network protection control terminal, forms a timing sequence fixed value matching scheme of the distribution network protection control terminal and sends the scheme to different distribution network protection control terminals; when a communication fault occurs, the distribution network substation control device and the distribution network protection control terminal respectively detect a link fault, the distribution network substation control device locks the main protection of a communication fault area, and the distribution network protection control terminal starts the local backup protection of the corresponding area;
step S11, the distribution network protection control terminal executes protection action and fault location, judges whether the line has fault according to the maximum load current fixed value, and executes different protection control modes according to different terminal types, wherein the terminal types comprise a breaker terminal and a load switch terminal;
step S12, the breaker terminal firstly carries out fault removal, when the matching condition among a plurality of breaker terminals is needed, the breaker needs to be subjected to time sequence matching, and the fault occurrence area is determined through the matching of the breaker;
step S13, the load switch terminal judges whether the load switch is in the fault clearing range of the breaker according to the action time of the breaker, and if the load switch is in the fault range, the load switch is rapidly separated;
step S14, after the breaker terminal removes the fault and the load switch is separated, the breaker reclosing is carried out according to the action time limit set by the distribution network substation control device to gradually recover the power supply
Step S15, after the load switch terminal is successfully reclosed, judging whether the failure current disappearance time reaches a self closing time fixed value, and after the failure current disappearance time reaches the self closing time fixed value, controlling the load switch of the unit to be closed so as to enable the power-losing line to gradually recover power supply;
step S16, carrying out overcurrent judgment on the load switch terminal after closing, and judging a fault element; after the fault is removed, and after the time limit of the position-dividing action of the load switch, the circuit breaker terminal accelerates the reclosing of the circuit breaker and recovers the power supply;
step S17, after meeting the coincidence time of all load switches, if no fault current is generated, judging the current fault as an instantaneous fault;
and step S18, comparing the time of the fault current appearing-disappearing-reappearing-disappearing with the time sequence setting relation of all the terminals by the distribution network substation control device, and finally determining a fault point.
In step S16, the load switch terminal performs overcurrent determination after being switched on, and the step of determining the faulty component further includes:
when the overcurrent appears and disappears at the moment of closing the position, the load switch terminal controls the load switch of the unit to divide the position, and the fault element is judged to be the unit connected with the load switch;
when the overcurrent disappears after a period of time after the load switch is closed, the load switch terminal keeps the closed position of the load switch of the unit, and the fault element is judged to be a non-connected unit at the downstream of the load switch.
Wherein the step S16 further includes: and if the fault current disappears in the specified time range, judging that the load switch is in the fault removal range of the breaker.
The distribution network substation control device is arranged at the distribution network substation, is used for carrying out self-adaptive identification on network topology connected with the distribution network substation, determining a main protection and backup protection strategy, a backup self-healing strategy, a time sequence and a fixed value, and issuing the main protection and backup protection strategy, the backup self-healing strategy, the time sequence and the fixed value to a distribution network protection control terminal; the active self-healing device is used for starting reclosing and spare power automatic switching to realize fault self-healing and power supply recovery;
the distribution network protection control terminal is arranged in each distribution station/switching station of the distribution network and used for transmitting real-time data acquisition information of the distribution station/switching station to the regional substation; receiving breaker/load switch action information sent by the regional substation control device, executing corresponding action, and reporting action execution results; and the device is used for receiving a time fixed value setting result issued by the regional substation and realizing the matching of backup protection and main protection and unit autonomy.
Wherein, the real-time data acquisition information of the power distribution station/switching station comprises: the on-off state information of the circuit breaker or the load switch, the operation information of the bus and the line, the equipment state detection and the fault alarm information; and the bus and line operation information is bus voltage sampling information or line current sampling information.
The network is a communication network formed by 100/1000Mbps Ethernet.
The implementation of the invention has the following beneficial effects:
in the method provided by the invention, data information is transmitted between the distribution network substation control device and the distribution network protection control terminal through the network, so that the protection has good matching characteristics, the method can automatically adapt to the change of the distribution network topology, and the selectivity and the reliability of the protection can be ensured through the time sequence information of the information transmitted between the protections under the condition of network failure.
The invention fully utilizes the capability of the network for transmitting data information, greatly enhances the matching characteristic between the protections, can adapt to the change of the network topology, adds the time sequence information between the information transmissions, and ensures the selectivity and the reliability of the protection, thereby quickly and accurately cutting off and isolating the fault area, recovering the power supply for the normal area in time, and ensuring the reliability of the power supply.
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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, and 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 drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of a network-based power distribution network adaptive backup protection control system provided by the present invention;
fig. 2 is a schematic main flow chart of an embodiment of a network-based power distribution network adaptive backup protection control method provided by the present invention;
fig. 3 is a detailed flowchart of an embodiment of a network-based power distribution network adaptive backup protection control method provided by the present invention.
Detailed Description
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.
Fig. 1 is a schematic structural diagram illustrating an embodiment of a network-based power distribution network adaptive backup protection control system according to the present invention; in this embodiment, the system includes:
distribution network sub-station control device 1 and a plurality of distribution network protection control terminals 3 connected with it through communication network 2, wherein:
the distribution network substation control device 1 is arranged at the distribution network substation, is used for carrying out self-adaptive identification on network topology connected with the distribution network substation, determining a main protection and backup protection strategy, a backup self-healing strategy, a time sequence and a fixed value, and issuing the main protection and backup protection strategy, the backup self-healing strategy, the time sequence and the fixed value to a distribution network protection control terminal; the active self-healing device is used for starting reclosing and spare power automatic switching to realize fault self-healing and power supply recovery;
more specifically, an adaptive recognition algorithm model (primary network or secondary network) of a network topology is configured in the distribution network substation control device 1; a first and second order correlation model; adaptive protection configuration, strategy, logic algorithm; self-healing control configuration, strategy and logic algorithm; the system configures a language model; distribution network IED engineering example models and the like. The self-adaptive protection device can realize the self-adaptive protection function and the self-healing control function.
The self-adaptive protection function comprises a main protection strategy, a backup protection strategy, a time sequence and a fixed value issuing function. The main protection is a centralized networking main protection function, and is a backup protection strategy mechanism which is updated in real time according to primary network topology and is issued to a distribution network protection control terminal. The centralized protection is used as main protection for realizing the power distribution network in a networking mode, and the adopted protection principles are adaptive algorithms such as current differential protection and locking type current protection.
The self-healing control function mainly comprises self-adaptive power grid topology, an operation mode, reclosing starting and spare power automatic switching to realize active self-healing of fault self-healing and power supply recovery. Meanwhile, a backup self-healing strategy, a time sequence and a fixed value with network topology identification are issued to the distribution network protection control terminal.
The distribution network protection control terminal 3 is arranged in each distribution station/switching station of the distribution network and is used for transmitting real-time data acquisition information of the distribution station/switching station to the regional substation; receiving breaker/load switch action information sent by the regional substation control device, executing corresponding action, and reporting action execution results; and the device is used for receiving a time fixed value setting result issued by the regional substation and realizing the matching of backup protection and main protection and unit autonomy.
The network is a communication network formed by 100/1000Mbps Ethernet. Wherein, the real-time data acquisition information of the power distribution station/switching station comprises: the on-off state information of the circuit breaker or the load switch, the operation information of the bus and the line, the equipment state detection and the fault alarm information; and the bus and line operation information is bus voltage sampling information or line current sampling information.
It can be understood that the real-time data acquisition information sent by the terminal device may be different according to different configurations of the secondary devices of the power distribution station/the switching station. The switching state information of the power distribution station/switching station circuit breakers (load switches and the like) provides an information basis for the real-time network topology modeling of the regional substation. The operation information of the bus and the line of the power distribution station/switching station of the unit can be transmitted to different information according to the different configuration conditions of the secondary equipment: the method comprises the steps that bus voltage sampling information of a distribution station/a switch station is transmitted to a unit configured with a voltage transformer; transmitting current sampling information of a distribution station/switch station line on a line configured with a current transformer; the power distribution station/switch station with direction judgment and fault overcurrent judgment can transmit data information such as direction information, overcurrent and the like. The unit power distribution station/switch station can upload equipment state detection and fault alarm information, and provides data support for operation and maintenance management and maintenance scheme formulation of the regional substation.
More specifically, the distribution network substation control device may include a protection subsystem, a self-healing subsystem, and a subsystem; and the distribution network protection control terminal comprises an execution unit, a merging unit and a local protection unit.
Fig. 2 is a schematic main flow chart of an embodiment of a network-based power distribution network adaptive backup protection control method provided by the present invention; together with the more detailed flow diagram of fig. 3. It is understood that the method is implemented in the system introduced in fig. 1, and the method includes:
step S10, the distribution network substation control device periodically receives the measurement value of the distribution network protection control terminal, forms a timing sequence fixed value matching scheme of the distribution network protection control terminal and sends the scheme to different distribution network protection control terminals; judging whether the network is intact or not by inquiring information messages (such as SV/GOOSE messages and the like), and repeating the current work under the condition of good network; when a communication fault occurs, the distribution network substation control device and the distribution network protection control terminal respectively detect that a link fails, the distribution network substation control device locks main protection of a communication fault area, and the distribution network protection control terminal starts local backup protection of a corresponding area;
step S11, taking the distribution network protection control terminal as a backup protection main body, executing protection action and fault positioning, judging whether a line has a fault according to the maximum load current fixed value, and executing different protection control modes according to different terminal types, wherein the terminal types comprise a circuit breaker terminal and a load switch terminal; the maximum load current constant value can be obtained through the judgment result of the operation mode of the distribution network substation under the condition of good communication.
Step S12, the breaker terminal firstly carries out fault removal, when the matching condition among a plurality of breaker terminals is needed, the breaker needs to be subjected to time sequence matching, and the fault occurrence area is determined through the matching of the breaker;
step S13, the load switch terminal judges whether the load switch is in the fault clearing range of the breaker according to the action time of the breaker, if the fault current disappears in the appointed time range, the load switch is judged to be in the fault range, and at the moment, the load switch is rapidly separated;
step S14, after the fault is removed, and after the time limit of the position separation action of the load switch (after the time limit of the position separation action of the load switch is avoided), the breaker terminal carries out reclosing according to the action time limit set by the distribution network substation control device so as to gradually recover power supply; the action time limit is set by the distribution network substation and then stored in each terminal;
step S15, after the load switch terminal is successfully reclosed, judging whether the failure current disappearance time reaches a self closing time fixed value, and after the time fixed value is reached, controlling the load switch of the unit to be closed (at the moment, the load terminals of different stations are closed according to the self time fixed value) so as to gradually recover the power supply of the power-off line;
step S16, carrying out overcurrent judgment on the load switch terminal after closing, and judging a fault element; after the fault is removed, and after the time limit of the position-dividing action of the load switch, the circuit breaker terminal accelerates the reclosing of the circuit breaker and recovers the power supply;
specifically, the step of determining the faulty element further includes:
when overcurrent appears and disappears at the moment of closing the position (at the moment, the fault area breaker terminal acts on tripping again), the load switch terminal controls the load switch of the unit to divide the position, and the fault element is judged to be a load switch connection unit;
when the overcurrent disappears after a period of time after the circuit is closed (at the moment, the fault area breaker terminal acts on tripping again), the load switch terminal keeps the closed position of the load switch of the unit, and the fault element is judged to be a non-connected unit at the downstream of the load switch.
Step S17, after meeting the coincidence time of all load switches, if no fault current is generated, judging the current fault as an instantaneous fault;
and step S18, comparing the time of the fault current appearing-disappearing-reappearing-disappearing with the time sequence setting relation of all the terminals by the distribution network substation control device, and finally determining a fault point.
The implementation of the invention has the following beneficial effects:
in the method provided by the invention, data information is transmitted between the distribution network substation control device and the distribution network protection control terminal through the network, so that the protection has good matching characteristics, the method can automatically adapt to the change of the distribution network topology, and the selectivity and the reliability of the protection can be ensured through the time sequence information of the information transmitted between the protections under the condition of network failure.
The invention fully utilizes the capability of the network for transmitting data information, greatly enhances the matching characteristic between the protections, can adapt to the change of the network topology, adds the time sequence information between the information transmissions, and ensures the selectivity and the reliability of the protection, thereby quickly and accurately cutting off and isolating the fault area, recovering the power supply for the normal area in time, and ensuring the reliability of the power supply.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (6)
1. A power distribution network self-adaptive backup protection control method based on a network is realized in a power distribution network self-adaptive backup protection control system based on the network, the system comprises a distribution network substation control device and a plurality of distribution network protection control terminals connected with the distribution network substation control device through the network, and the method is characterized by comprising the following steps:
step S10, the distribution network substation control device periodically receives the measurement value of the distribution network protection control terminal, forms a timing sequence fixed value matching scheme of the distribution network protection control terminal and sends the scheme to different distribution network protection control terminals; when a communication fault occurs, the distribution network substation control device and the distribution network protection control terminal respectively detect a link fault, the distribution network substation control device locks the main protection of a communication fault area, and the distribution network protection control terminal starts the local backup protection of the corresponding area;
step S11, the distribution network protection control terminal executes protection action and fault location, judges whether the line has fault according to the maximum load current fixed value, and executes different protection control modes according to different terminal types, wherein the terminal types comprise a breaker terminal and a load switch terminal;
step S12, the breaker terminal firstly carries out fault removal, when the matching condition among a plurality of breaker terminals is needed, the breaker needs to be subjected to time sequence matching, and the fault occurrence area is determined through the matching of the breaker;
step S13, the load switch terminal judges whether the load switch is in the fault clearing range of the breaker according to the action time of the breaker, and if the load switch is in the fault range, the load switch is rapidly separated;
step S14, after the fault is removed and the load switch is subjected to the position-dividing action time limit, the circuit breaker terminal carries out circuit breaker reclosing according to the action time limit set by the distribution network substation control device so as to gradually recover power supply;
step S15, after the load switch terminal is successfully reclosed, judging whether the failure current disappearance time reaches a self closing time fixed value, and after the failure current disappearance time reaches the self closing time fixed value, controlling the load switch of the unit to be closed so as to enable the power-losing line to gradually recover power supply;
step S16, carrying out overcurrent judgment on the load switch terminal after closing, and judging a fault element; after the fault is removed, and after the time limit of the position-dividing action of the load switch, the circuit breaker terminal accelerates the reclosing of the circuit breaker and recovers the power supply;
step S17, after meeting the coincidence time of all load switches, if no fault current is generated, judging the current fault as an instantaneous fault;
and step S18, comparing the time of the fault current appearing-disappearing-reappearing-disappearing with the time sequence setting relation of all the terminals by the distribution network substation control device, and finally determining a fault point.
2. The method of claim 1, wherein the load switch terminal is subjected to overcurrent determination after being closed in step S16, and the step of determining the fault component further comprises:
when the overcurrent appears and disappears at the moment of closing the position, the load switch terminal controls the load switch of the unit to divide the position, and the fault element is judged to be the unit connected with the load switch;
when the overcurrent disappears after a period of time after the load switch is closed, the load switch terminal keeps the closed position of the load switch of the unit, and the fault element is judged to be a non-connected unit at the downstream of the load switch.
3. A method according to claim 2, wherein said step S16 further comprises:
and if the fault current disappears in the specified time range, judging that the load switch is in the fault removal range of the breaker.
4. A method according to any one of claims 1 to 3, wherein:
the distribution network substation control device is used for carrying out self-adaptive identification on the network topology connected with the distribution network substation control device, determining a main protection and backup protection strategy, a backup self-healing strategy, a time sequence and a fixed value, and issuing the main protection and backup protection strategy, the backup self-healing strategy, the time sequence and the fixed value to a distribution network protection control terminal; the active self-healing device is used for starting reclosing and spare power automatic switching to realize fault self-healing and power supply recovery;
the distribution network protection control terminal is arranged in each distribution station/switching station of the distribution network and used for transmitting real-time data acquisition information of the distribution station/switching station to a distribution network substation control device; receiving breaker/load switch action information issued by the distribution network substation control device, executing corresponding actions, and reporting action execution results; and the time constant value setting result is sent by the distribution network substation control device, and the backup protection and the main protection are matched.
5. The method of claim 4, wherein the real-time data collection information of the distribution/switching stations comprises: the on-off state information of the circuit breaker or the load switch, the operation information of the bus and the line, the equipment state detection and the fault alarm information; and the bus and line operation information is bus voltage sampling information or line current sampling information.
6. The method of claim 5, wherein the network is a communications network consisting of 100/1000Mbps ethernet.
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| CN110380515B (en) * | 2019-08-06 | 2022-08-30 | 上海金智晟东电力科技有限公司 | Experimental network monitoring system for power distribution network |
| CN111509859B (en) * | 2020-05-19 | 2023-03-10 | 广州穗华能源科技有限公司 | Low-voltage distribution network system based on load space-time characteristics and physical topology identification method |
| CN111987701B (en) * | 2020-08-20 | 2023-02-17 | 广东电网有限责任公司 | Power distribution network maintenance method |
| CN112736872B (en) * | 2020-12-25 | 2023-03-31 | 贵州电网有限责任公司 | Power distribution network protection control strategy optimization method based on real-time analysis of operation mode |
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| US9136692B2 (en) * | 2013-06-11 | 2015-09-15 | Electrical Materials Company | Low fault current isolator system |
| CN103944153A (en) * | 2014-04-25 | 2014-07-23 | 湖南大学 | Self-adaption intelligent protection method for power distribution network applied to high-permeability distributed power supply |
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