CN112736868A - 5G intelligent distributed distribution network protection system - Google Patents
5G intelligent distributed distribution network protection systemDownload PDFInfo
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- CN112736868A CN112736868ACN202011536044.8ACN202011536044ACN112736868ACN 112736868 ACN112736868 ACN 112736868ACN 202011536044 ACN202011536044 ACN 202011536044ACN 112736868 ACN112736868 ACN 112736868A
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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
- 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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- Emergency Protection Circuit Devices (AREA)
Abstract
Description
Technical Field
The invention belongs to the field of electric power, and particularly relates to a 5G intelligent distributed distribution network protection system.
Background
The domestic power distribution network basically takes a single power supply radial mode or a zone power supply mode based on a closed loop structure and open loop operation as a main mode. The power supply mode of closed loop structure, open loop operation, the plan is overhauld and is closed the ring operation realization to the incessant power supply of user for a short time such as contact switch, disconnection feeder switch, but still can't avoid the user to have a power failure for a short time when the electric wire netting trouble, has reduced the reliability of power supply. In addition, with the rapid development of a new energy power generation technology, a large number of distributed power supplies are connected to a power distribution network, so that the power distribution network is converted into a complex multi-power-supply active network from a traditional single-end radial network.
Disclosure of Invention
The invention aims to solve the technical problem of providing a 5G intelligent distributed distribution network protection system.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a 5G intelligence distributing network protection system, is applicable to looped netowrk network framework, includes SOC main processing unit, analog quantity collection module, communication module and clock module, SOC main processing unit includes FPGA module and CPU module, the FPGA module is used for controlling analog quantity collection module and carries out analog quantity collection and carry out synchronous management to the clock module, the CPU module is used for carrying out differential protection according to the analog quantity, communication module is used for communicating.
Preferably, when the system operates in an open loop, if the main line fails, only one side of the main line provides short-circuit current, the CPU module executes a circuit differential protection action to trip off a switch at the inlet wire end of the power supply to isolate the fault, and starts a reclosing switch; if the fault is instantaneous, the reclosing is successful, the system recovers normal power supply, and if the fault is permanent, the rear acceleration protection is utilized to trip off a main line local side switch and inform an opposite side switch of tripping through a communication module; and then the connection switch is closed, and the power supply of the normal section is recovered.
Preferably, when the system is operated in an open loop mode, if the bus fails, the CPU module executes a bus differential protection action to trip the power supply inlet and outlet switches to isolate the fault, and then closes the connection switch to recover the power supply in the normal section.
Preferably, when the system is operated in an open loop mode, if the outgoing feeder fails, the CPU module executes an outgoing feeder overcurrent protection action to trip off the outgoing feeder switch, and starts a reclosing switch, if the system fails instantaneously, the reclosing succeeds, the system recovers to normal power supply, if the system fails permanently, the CPU module accelerates after the reclosing action to trip off the outgoing feeder switch again to isolate the fault, and the non-fault section supplies power normally.
Preferably, when the protection action jumps to the corresponding switch, if the switch fails, the breaker at the previous stage is required to be started in a failure protection mode, the corresponding switch is tripped, and the fault is isolated by expanding the power failure range.
Preferably, when the system operates in a closed loop, if the main line fails, short-circuit currents are provided at two sides, the CPU module executes a line differential protection action to trip off electrical switches at two ends of the main line to isolate the fault, and starts a reclosing switch once, if the system fails to reclose successfully in case of an instantaneous fault, the system recovers to normal power supply, and if the system fails to operate in a permanent state, the switches at two ends of the main line are tripped off by using a post-acceleration protection to isolate the fault, and the non-fault section recovers to normal power supply.
Preferably, when the system operates in a closed loop, if the bus fails, the CPU module executes a bus differential protection action to trip the incoming line and outgoing line switches with the power supply to isolate the fault, and the fault-free section supplies power normally.
Preferably, when the system operates in a closed loop, if the feeding line fails, the CPU module executes a feeding line overcurrent protection action to trip off the feeding line switch, and starts a reclosing switch, if the feeding line has a fault instantaneously, the reclosing succeeds, the system recovers to normal power supply, if the feeding line has a fault permanently, the reclosing action is accelerated to trip off the feeding line switch again to isolate the fault, and the non-fault section supplies power normally.
Preferably, when the protection action jumps to the corresponding switch, if the switch fails, the breaker at the previous stage is required to be started in a failure protection mode, the corresponding switch is tripped, and the fault is isolated by expanding the power failure range.
Preferably, the CPU module is further configured to synchronize differential protection:
and establishing a system mathematical model, respectively calculating two vectors with the same quantity by using the sampling data of the side and the opposite side, wherein the two calculated vectors have a certain phase difference, and correcting the data at the two ends according to the system parameter model so as to realize synchronization.
The technical scheme adopted by the invention has the following beneficial effects:
1. differential protection is carried out through the CPU module according to the analog quantity without configuring a special differential protection device, so that the construction cost of the power distribution network is reduced;
2. when the system operates in an open loop or a closed loop, the differential protection can be realized to realize the rapid isolation of the power distribution network fault.
The following detailed description of the present invention will be provided in conjunction with the accompanying drawings.
Drawings
The invention is further described with reference to the accompanying drawings and the detailed description below:
fig. 1 is a schematic structural diagram of a 5G intelligent distributed distribution network protection system according to 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. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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.
Referring to fig. 1, a 5G intelligent distributed distribution network protection system is suitable for a ring network architecture, and includes an SOC main processing unit, an analog acquisition module, a communication module, and a clock module, where the SOC main processing unit includes an FPGA module and a CPU module, the FPGA module is used to control the analog acquisition module to perform analog acquisition and to perform synchronous management on the clock module, the CPU module is used to perform differential protection according to the analog, and the communication module is used to communicate.
In the embodiment, differential protection is performed through the CPU module according to the analog quantity, and a special differential protection device does not need to be configured, so that the construction cost of the power distribution network is reduced.
In this embodiment, the ring network architecture has functions of current differential protection, automatic reclosing and feeder automation of the ring main unit incoming and outgoing line configuration line, overcurrent protection, automatic reclosing and feeder automation of the feeder configuration line, bus differential protection and breaker failure protection of the ring main unit bus configuration line, and the like; the distributed protection of the power distribution network tracks the change of the network topology and the operation mode of the power distribution network in real time through a dynamic topology model, and the self-adaptive change of the network topology and the operation mode is realized; according to the topological structure of the power distribution network, sampling values (or vectors), state information and fault judgment information can be mutually transmitted among all associated DTUs through a 5G wireless network.
When the system operates in an open loop mode, if a main line fails, only one side of the main line provides short-circuit current, the CPU module executes circuit differential protection action to trip off a switch at the inlet wire end of the power supply to isolate the fault, and a reclosing switch is started; if the fault is instantaneous, the reclosing is successful, the system recovers normal power supply, and if the fault is permanent, the rear acceleration protection is utilized to trip off a main line local side switch and inform an opposite side switch of tripping through a communication module; and then the connection switch is closed, and the power supply of the normal section is recovered.
When the system operates in an open loop mode, if the bus fails, the CPU module executes bus differential protection action, trips off the power supply inlet and outlet switches to isolate faults, and then closes the connection switches to recover the power supply of a normal section.
When the system is in open-loop operation, if the feed-out line has a fault, the CPU module executes the feed-out line overcurrent protection action to trip off the feed-out line switch, a reclosing switch is started, if the feed-out line has the fault, the reclosing is successful, the system recovers normal power supply, if the feed-out line has the fault, the acceleration action after the reclosing again trips off the feed-out line switch to isolate the fault, and a non-fault section normally supplies power;
when the protection action jumps to the corresponding switch, if the switch fails, the breaker of the previous stage is needed to be started in failure protection, the corresponding switch is tripped, and the fault is isolated by expanding the power failure range.
When the system operates in a closed loop, if the main line has a fault, short-circuit current is provided on two sides, the CPU module executes circuit differential protection action to jump off electric switches at two ends of the main line to isolate the fault, one reclosing is started, if the fault is instantaneous, the reclosing is successful, the system recovers normal power supply, if the fault is permanent, the switches at two ends of the main line are jumped off by using post-acceleration protection to isolate the fault, and the normal power supply is recovered in a non-fault section.
When the system operates in a closed loop, if the bus fails, the CPU module executes bus differential protection action, the incoming line switch and the outgoing line switch with the power supply are tripped off to isolate the fault, and the fault-free section supplies power normally.
When the system operates in a closed loop, if the feed-out line has a fault, the CPU module executes the feed-out line overcurrent protection action to trip off the feed-out line switch, a reclosing switch is started, if the feed-out line has the fault, the reclosing is successful, the system recovers normal power supply, if the feed-out line has the fault, the acceleration action after the reclosing is used for tripping off the feed-out line switch again to isolate the fault, and a non-fault section normally supplies power.
When the protection action jumps to the corresponding switch, if the switch fails, the breaker of the previous stage is needed to be started in failure protection, the corresponding switch is tripped, and the fault is isolated by expanding the power failure range.
In the embodiment, when the system operates in an open loop or a closed loop, the differential protection can be used for realizing the rapid isolation of the power distribution network fault.
The differential protection of the power grid line generally adopts a special or multiplexing optical fiber channel to transmit a sampling value or phasor, and a distributed bus can be divided into a main mode of a ring network and a non-main mode of the ring network according to a protection function and a communication function part, wherein the network topologies of the main mode and the non-main mode are bidirectional redundant ring networks. With the continuous maturity and large-scale deployment of the 5G technology, based on the superior performances of ultra-low time delay, ultra-high bandwidth, higher moving speed and mass access, the high cost and difficulty of erecting special optical fibers are overcome, and a new way is opened up for the application of the special optical fibers in differential protection of a power distribution network.
The differential protection is very mature as a main protection scheme of a high-voltage power grid, but when the differential protection is applied to a distribution network system, the differential protection needs to be adaptively adjusted according to the characteristics of a distribution network. The high-voltage power grid topological structure is relatively stable, the operation modes of the distribution network system are various, the topological structure changes frequently, and the problems of huge operation and maintenance workload and long power failure time are caused by the change of protection configuration, so that the distribution network differential protection is required to be capable of adapting to the change of the system topology, and the requirements of various operation modes of the distribution network system are met. The number of the distribution network terminals is large, and accurate time synchronization of the terminals is difficult to realize, so that an applicable synchronization mode is required to be explored by applying a distribution network differential protection system, and the requirement of differential protection sampling synchronization is met. The distribution network system is generally one network with multiple purposes and needs to be isolated according to different services.
In this embodiment, the line differential protection synchronization method includes a data channel-based synchronization method, a GPS-based synchronization method, and a reference vector-based synchronization method.
The method comprises the steps of firstly measuring channel delay, and then correcting sampling data, sampling time or a clock to achieve the purpose of synchronizing the time of the data; the method allows each device to independently sample and have the same sampling frequency, but requires the same communication route, the same time delay is required for receiving and transmitting, otherwise, the accurate synchronization cannot be ensured, and the action behavior of differential protection is further influenced.
The synchronization method based on the reference vector comprises the following steps: the method is independent of communication channel and is not affected by channel route change. The sampling synchronization is realized by utilizing the electric quantity of the electric power system, a mathematical model of the system is firstly required to be established, the protection sampling utilizes the sampling data of the side and the opposite side to respectively calculate two vectors of the same quantity, the calculated two vectors have a certain phase difference, and the data at two ends are corrected according to a system parameter model, so that the synchronization is realized.
A Global Positioning System (GPS) based synchronization method: the sampling clock of the protection unit is accurately synchronized through the GPS time service information, and then the time synchronization of the sampling data is realized.
In the embodiment, the communication module comprises a 5G wireless communication module, an electric Ethernet, a CAN control bus, an RS-422HMI communication bus, an RS-485 bus and the like.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in other forms without departing from the spirit or essential characteristics thereof. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (10)
1. The utility model provides a 5G intelligence distributing network protection system, is applicable to looped netowrk network framework, its characterized in that, including SOC main processing unit, analog quantity collection module, communication module and clock module, SOC main processing unit includes FPGA module and CPU module, the FPGA module is used for controlling analog quantity collection module and carries out analog quantity collection and carries out synchronous management to the clock module, the CPU module is used for carrying out differential protection according to the analog quantity, communication module is used for communicating.
2. The 5G intelligent distributed distribution network protection system according to claim 1, wherein when the system is operated in an open loop, if a main line fails, only one side of the main line provides short-circuit current, the CPU module performs a line differential protection action to trip off a switch at one end of an inlet line of a power supply to isolate the fault, and starts a reclosing switch; if the fault is instantaneous, the reclosing is successful, the system recovers normal power supply, and if the fault is permanent, the rear acceleration protection is utilized to trip off a main line local side switch and inform an opposite side switch of tripping through a communication module; and then the connection switch is closed, and the power supply of the normal section is recovered.
3. The 5G intelligent distributed distribution network protection system according to claim 1, wherein when the system is operated in an open loop, if a bus fails, the CPU module performs bus differential protection action, trips off a power supply inlet and outlet switch to isolate the fault, and closes a connection switch to recover normal section power supply.
4. The system of claim 1, wherein when the system is operated in an open loop mode, if a feeder line fails, the CPU executes an overcurrent protection action of the feeder line to trip off a feeder line switch, and starts a reclosing switch, if the feeder line fails in an instantaneous manner, the reclosing is successful, the system recovers to a normal power supply, and if the feeder line fails in a permanent manner, the CPU restarts the feeder line switch to isolate the fault by an accelerated action after the reclosing, and a non-fault section supplies power normally.
5. The 5G intelligent distributed distribution network protection system according to claim 4, wherein when the protection action is to trip the corresponding switch, if the switch fails, the breaker failure protection of the previous stage is required to be started, and the corresponding switch is tripped, so that the fault is isolated by expanding the power failure range.
6. The system of claim 1, wherein when the system operates in a closed loop, if the trunk line fails, short-circuit current is provided from both sides, the CPU module performs a line differential protection action to trip off the electrical switch isolation fault at both ends of the trunk line, and starts a reclosing switch, if the instantaneous fault occurs, the reclosing is successful, the system recovers to normal power supply, if the permanent fault occurs, the switch at both ends of the trunk line is tripped off by using post-acceleration protection to isolate the fault, and the non-fault section recovers to normal power supply.
7. The 5G intelligent distributed distribution network protection system according to claim 1, wherein when the system is in closed-loop operation, if a bus fails, the CPU module performs bus differential protection action to break the fault of the incoming line switch and the outgoing line switch with the power supply, and a fault-free section supplies power normally.
8. The system of claim 1, wherein when the system operates in a closed loop, if a feeder line fails, the CPU executes an overcurrent protection action of the feeder line to trip off a feeder line switch, and starts a reclosing switch, if the feeder line fails in a transient state, the reclosing is successful, the system recovers to a normal power supply, and if the feeder line fails in a permanent state, the reclosing action is accelerated to trip off the feeder line switch again to isolate the fault, and a non-fault section supplies power normally.
9. The system of claim 8, wherein when the protection action is to trip the corresponding switch, if the switch fails, the breaker failure protection of the previous stage is required to be started, and the corresponding switch is tripped, so that the fault is isolated by expanding the power failure range.
10. The 5G intelligent distributed distribution network protection system of claim 1, wherein the CPU module is further configured to synchronize differential protection:
and establishing a system mathematical model, respectively calculating two vectors with the same quantity by using the sampling data of the side and the opposite side, wherein the two calculated vectors have a certain phase difference, and correcting the data at the two ends according to the system parameter model so as to realize synchronization.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113422354A (en)* | 2021-06-25 | 2021-09-21 | 国网辽宁省电力有限公司电力科学研究院 | Power distribution network protection and self-healing system based on 5G network communication |
| CN113488962A (en)* | 2021-06-25 | 2021-10-08 | 科大智能电气技术有限公司 | Sampling synchronous control system and method for differential protection |
| CN115268339A (en)* | 2022-08-17 | 2022-11-01 | 中国舰船研究设计中心 | A three-redundant integrated control system and control method |
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