CN114465212A - Power distribution network protection and self-healing method, device, system and storage medium - Google Patents
Power distribution network protection and self-healing method, device, system and storage medium 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
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to the technical field of power distribution network protection, in particular to a power distribution network protection and self-healing method, a device, a system and a storage medium. Based on the network topology form, the method of the invention provides a protection strategy and a self-healing method by combining a distributed power supply aiming at two most common forms of transfer power supply and non-transfer power supply, and solves the problem that the protection strategy of a power distribution network with the distributed power supply is easy to cause misoperation or failure of a protection device.
Description
Technical Field
The invention relates to the technical field of power distribution network protection, in particular to a power distribution network protection and self-healing method, device and system and a storage medium.
Background
Distribution automation is an important component of an intelligent power grid, and the core of the distribution automation is fault treatment of the power distribution network, so that the distribution automation has important significance for improving power supply reliability, expanding power supply capacity and realizing efficient and economic operation of the power grid. The traditional current protection principle is based on voltage and current detection of independent units, and mutual coordination of protection depends on action current fixed values and corresponding time delay, and the protection action condition of adjacent switches is not concerned. Under the conditions that the multi-stage switches are operated in series, the positions and the operation modes of the interconnection switches are frequently changed, and a large number of distributed power supplies are connected into a distribution network, the traditional current protection principle is completely not suitable for the requirements of the modern distribution network.
Through the research on the traditional protection and the centralized digital logic protection, and the combination with the communication technology which is popular nowadays, a peer-to-peer communication network is introduced, and a novel protection strategy, namely area protection, is formed. The area protection adopts a brand-new distributed protection matching idea to solve the problems of the traditional protection and the centralized arbitration type protection, and on the basis of a network topology theory, a set of intelligent power distribution network protection algorithm and a realization scheme with wide applicability areas and good selectivity are designed, so that the intelligent power distribution network protection algorithm and the realization scheme are suitable for a backbone network with high power supply reliability requirement, the protection matching of a distribution network automation system is enabled to pass the process from distribution to concentration and from concentration to distribution, and the matching is completed more efficiently by utilizing a modern communication mode and simple and feasible criteria.
For the power distribution network with the distributed power supply, the addition of the distributed power supply makes the protection strategy become complicated and changeable, the protection action rejection or misoperation often occurs in the traditional protection strategy due to the addition of the distributed power supply, and how to combine the regional protection mode with the distributed power supply to optimize the protection technology of the power distribution network with the distributed power supply is a difficult problem for the technicians in the field.
Based on this, a power distribution network protection and self-healing method needs to be developed and designed.
Disclosure of Invention
The embodiment of the invention provides a method, a device, a system and a storage medium for protecting and self-healing a power distribution network, which are used for solving the problem that the protection strategy of the power distribution network with a distributed power supply in the prior art is incomplete.
In a first aspect, an embodiment of the present invention provides a power distribution network protection and self-healing system, including:
the server comprises a server and a plurality of terminal devices, wherein the plurality of terminal devices are in signal connection with the server;
the terminal device is applied to a power distribution network, and the power distribution network comprises: the device comprises at least two looped networks, a transfer switch and a distributed power supply;
the ring networks are connected through the transfer switch, the distributed power supply can be selectively connected with one of the ring networks, the terminal device is used for collecting the state of the ring network and the state of each switch of the ring network, the server generates a control command according to the state of the ring network and the state of each switch of the ring network, and the terminal device controls the opening and closing of each switch according to the control command.
In one possible implementation, each of the ring networks includes: a power supply and two bus bars; each of the switches includes: a loop closing switch;
the first ends of the two buses are respectively electrically connected with the power supply, and the second ends of the two buses are electrically connected through the loop closing switch;
the transfer switch comprises a first interconnection switch and a second interconnection switch, the second end of the first interconnection switch is connected with the first end of the second interconnection switch, and the first end of the first interconnection switch and the second end of the second interconnection switch are respectively connected with the second ends of the buses of two different looped networks.
In one possible implementation manner, the switches further include: the bus comprises a plurality of bus sections, two ends of each bus section are electrically connected with the two section switches respectively, one end of each feeder switch is electrically connected with the corresponding bus section, and the other end of each feeder switch is electrically connected with the corresponding feeder.
In one possible implementation, the distributed power source is connected to the second terminal of the first tie switch and the first terminal of the second tie switch.
In a second aspect, an embodiment of the present invention provides a power distribution network protection and self-healing method, which is applied to the system in the first aspect, and the power distribution network protection and self-healing method includes:
acquiring the state of the looped network and the state of each switch of the looped network, wherein the state of the looped network comprises the load of a bus section and the load of a feeder line;
determining a topological structure of the power distribution network according to the states of the switches;
and determining a protection strategy and a self-healing strategy according to the state of the ring network and the topological structure.
In a possible implementation manner, the determining a protection policy and a self-healing policy according to the states of the respective lines and the topology includes:
if the topological structure is in a non-transfer state, determining a bus of the distributed power supply grid connection as a strategy adjusting bus;
determining a looped network where the strategy adjusting bus is located as a strategy adjusting looped network;
acquiring an output load of a ring network power supply and an output load of the distributed power supply, wherein the output load of the ring network power supply is a load output by the strategy adjusting ring network to the strategy adjusting bus;
determining a bus section with a fault according to the output load of the ring network power supply and the output load of the distributed power supply;
and switching on the switches at the two ends of the fault bus section and switching off the loop closing switch of the bus where the fault bus section is located.
In a possible implementation manner, the determining a protection policy and a self-healing policy according to the states of the respective lines and the topology includes:
if the topological structure is in a switching state, determining that the bus of the distributed power supply grid connection is a strategy adjustment bus, and determining that the bus supplied with power through the switching switch is a switching power supply bus;
determining a looped network where the strategy adjusting bus is located as a strategy adjusting looped network;
acquiring an output load of a ring network power supply, an output load of the distributed power supply and a power transfer load, wherein the output load of the ring network power supply is a load output by the strategy adjusting ring network to the strategy adjusting bus, and the power transfer load is a load with the power transfer bus;
determining a bus section with a fault according to the output load of the ring network power supply, the output load of the distributed power supply and the power transfer load;
and switching on the switches at the two ends of the fault bus section and switching off the loop closing switch of the bus where the fault bus section is located.
In a third aspect, an embodiment of the present invention provides a power distribution network protection and self-healing device, including:
the state acquisition module is used for acquiring the state of the looped network and the state of each switch of the looped network, wherein the state of the looped network comprises the load of a bus section and the load of a feeder line;
the topology determining module is used for determining the topological structure of the power distribution network according to the states of the switches of all the sections;
and the number of the first and second groups,
and the protection and self-healing module is used for determining a protection strategy and a self-healing strategy according to the state of the ring network and the topological structure.
In a fourth aspect, the embodiments of the present invention provide a server, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps of the method according to the second aspect or any possible implementation manner of the second aspect.
In a fifth aspect, the present invention provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of the method according to the first aspect or any one of the possible implementation manners of the first aspect.
Compared with the prior art, the implementation mode of the invention has the following beneficial effects:
the embodiment of the invention discloses a power distribution network protection and self-healing method, which is applied to a power distribution network with distributed power supplies, wherein the distributed power supplies of the power distribution network are connected to the power grid through interconnection lines, so that fewer grid-connected lines can be arranged, a looped network to be connected to the power grid is selected, capacity of the lines needing capacity increase is increased, and line loss caused by long-distance power supply can be reduced. Based on the network topology form, the method provided by the invention provides a protection strategy and a self-healing method by combining the distributed power supply aiming at two most common forms of transfer power supply and non-transfer power supply, and solves the problem that the protection strategy of the power distribution network with the distributed power supply is easy to cause misoperation or failure of a protection device.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a topology diagram of a power distribution network with distributed power sources provided by an embodiment of the present invention;
fig. 2 is a flowchart of a power distribution network protection and self-healing method according to an embodiment of the present invention;
fig. 3 is a functional block diagram of a power distribution network protection and self-healing device provided in the embodiment of the present invention;
fig. 4 is a functional block diagram of a server according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made with reference to the accompanying drawings.
The following is a detailed description of the embodiments of the present invention, which is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Fig. 1 is a topological diagram of a power distribution network with distributed power sources according to an embodiment of the present invention.
A power distribution network protection and self-healing system, comprising:
the server comprises a server and a plurality of terminal devices, wherein the plurality of terminal devices are in signal connection with the server;
the terminal device is applied to a power distribution network, and the power distribution network comprises: the device comprises at least two looped networks, a transfer switch and a distributed power supply;
the ring networks are connected through the transfer switch, the distributed power supply can be selectively connected with one of the ring networks, the terminal device is used for collecting the state of the ring network and the state of each switch of the ring network, the server generates a control command according to the state of the ring network and the state of each switch of the ring network, and the terminal device controls the opening and closing of each switch according to the control command.
In one possible implementation, each of the ring networks includes: a power supply and two bus bars; each of the switches includes: a loop closing switch;
the first ends of the two buses are respectively electrically connected with the power supply, and the second ends of the two buses are electrically connected through the loop closing switch;
the transfer switch comprises a first interconnection switch and a second interconnection switch, the second end of the first interconnection switch is connected with the first end of the second interconnection switch, and the first end of the first interconnection switch and the second end of the second interconnection switch are respectively connected with the second ends of the buses of two different looped networks.
In one possible implementation manner, the switches further include: the bus comprises a plurality of bus sections, two ends of each bus section are electrically connected with the two section switches respectively, one end of each feeder switch is electrically connected with the corresponding bus section, and the other end of each feeder switch is electrically connected with the corresponding feeder.
In one possible implementation, the distributed power source is connected to the second terminal of the first tie switch and the first terminal of the second tie switch.
Illustratively, FIG. 1 shows a power distribution grid with distributed power sources.
In this distribution network, including two looped netowrk, two looped netowrks link together the generating line of two looped netowrks through changeing the confession switch.
A distributed power supply 107 is provided in the power distribution grid, and there are many embodiments of the distributed power supply 107, such as wind generators, solar panels, and the like, for example. The distributed power supply 107 can be selectively connected to one of the ring networks to realize grid-connected power generation.
Each ring network is provided with a section switch at a node for controlling the connection of the section. And the section of switch is provided with a terminal device in a matching way, and the terminal device is used for acquiring the opening and closing state of the section of switch and acquiring the corresponding state of the section, such as the voltage or the current of the section.
Further, each ring network is provided with a power supply, such as a transformer 101 shown in fig. 1, the output of the power supply is divided into two buses 102, the first sections of the two buses 102 are connected with the power supply, and the tail ends of the two buses are connected together through a loop closing switch 105. In a normal state, the loop closing switch 105 is in an open state, i.e., an open loop operation.
In the aspect of the transfer switch, one embodiment comprises two connection switches, wherein the first connection switch 108 is connected with the second connection switch 109 in series, and only when the two connection switches are closed simultaneously, the bus of one ring network can be transferred to the other ring network, and the bus is supplied by the other ring network.
Further, each section switch comprises a feeder switch and a section switch. The bus 102 includes a plurality of bus segments, i.e., the plurality of bus segments are connected end to end in sequence to form the bus 102. At each end of the bus-section there is a sectionalizing switch 106 for disconnecting the bus-section from other bus-sections when the bus-section is isolated or serviced.
Typically there will be at least one feeder 103 per bus section, and at the access end of the feeder 103 there is a feeder switch 110, the feeder 103 being for accessing the load 104.
Further, as for the connection manner of the distributed power sources 107, an example is that the distributed power sources 107 are connected to the end of the bus bar 102 through a transfer switch. The mode that sets up like this, the benefit lies in, make full use of tie line, connect the distributed power supply who distributes in all places, reduces the line loss with the load that end bus 102 links to each other, and, most importantly, can be through the tie switch, with the electric energy of distributed power supply alternative be incorporated into the power networks to the trade that needs the electric energy most, in order to alleviate the pressure of power 101 power supply.
For the functions of the server and the terminal device in the power distribution network, the terminal device is responsible for collecting the states of all section switches and the states (such as current and voltage) of related lines in the graph, the server acquires a topology model according to the states of the section switches and the states of the lines, gives a protection strategy based on the topology model, gives a control command of each section switch based on the protection strategy and the states of the lines, and sends the control command to the terminal device, and the terminal device executes the opening and closing actions of each section switch to complete the functions of protection and self-healing of the power distribution network.
As shown in fig. 2, it shows an implementation flowchart of the power distribution network protection and self-healing method provided by the embodiment of the present invention, and details are as follows:
in step 201, the state of the ring network and the states of switches of each segment of the ring network are obtained, where the state of the ring network includes a load of a bus segment and a load of a feeder line.
Illustratively, the load of the bus-section in one application scenario is the current flowing through the bus-section, and likewise the load of the feeder is the current flowing through the feeder, since both the bus-section voltage and the feeder voltage are known, the current and voltage can be combined to obtain the capacity carried by the bus-section or the feeder.
In step 202, the topological structure of the power distribution network is determined according to the states of the switches.
For example, as described above, since the distributed power source exists and is selectively connected to one bus of one of the ring networks for power generation in a grid-connected manner, a power supply form of supplying power from a first segment to a tail end of one ring network in the past is changed, when protection is performed, a topology structure of a power distribution network, particularly a form of supplying power from the distributed power source to the bus, should be analyzed, and thus a protection strategy is determined to avoid a possibility of false operation or rejection.
In step 203, a protection policy and a self-healing policy are determined according to the state of the ring network and the topology.
In some embodiments, step 203 comprises:
and if the topological structure is in a non-transfer state, determining the bus of the grid connection of the distributed power supply as a strategy adjusting bus. And determining the looped network where the strategy adjustment bus is positioned as the strategy adjustment looped network. And acquiring the output load of a ring network power supply and the output load of the distributed power supply, wherein the output load of the ring network power supply is the load output to the strategy adjustment bus by the strategy adjustment ring network. And determining the bus section with the fault according to the output load of the ring network power supply and the output load of the distributed power supply. And switching on the switches at the two ends of the fault bus section and switching off the loop closing switch of the bus where the fault bus section is located.
In some embodiments, step 203 comprises:
and if the topological structure is in a switching state, determining the bus of the distributed power supply grid connection as a strategy adjusting bus, and determining the bus supplied with power through the switching switch as a switching power supply bus. And determining the looped network where the strategy adjusting bus is positioned as the strategy adjusting looped network. The method comprises the steps of obtaining an output load of a ring network power supply, an output load of the distributed power supply and a power transfer load, wherein the output load of the ring network power supply is a load output to a strategy adjusting bus by a strategy adjusting ring network, and the power transfer load is a load of the power transfer bus. And determining the bus section with the fault according to the output load of the ring network power supply, the output load of the distributed power supply and the power supply transfer load. And switching on the switches at the two ends of the fault bus section and switching off the loop closing switch of the bus where the fault bus section is located.
Typically, the distribution network described above can be divided into two states, namely a transfer state and a non-transfer state. The following description will be made for each of the two states.
For the non-transfer state, two ring networks operate independently, the distributed power supply and one ring network are connected to generate power, for the ring network which is not connected with the distributed power supply, the distributed power supply still operates according to the traditional protection strategy, and for the ring network which is connected with the distributed power supply, the distributed power supply and the power supply power at the same time, so the protection strategy should be adjusted.
Taking fig. 1 as an example, in fig. 1, the distributed power supply 107 is connected to the lower bus 102 of the upper ring network, and it can be seen that, for each feeder 103 in the lower bus 102, the power supply 101 and the distributed power supply 108 supply power simultaneously, therefore, in this application scenario, the lower bus 102 of the upper ring network is determined as a protection policy adjustment bus, and the upper ring network is determined as a policy adjustment ring network.
For the upper bus of the upper ring network, the upper bus is in an open-loop operation state and is only powered by a power supply, so the protection strategy is a conventional protection strategy. For the lower bus of the upper ring network, the head end is powered by the power supply, and the tail end is powered by the distributed power supply 107, so for the load 104 connected with the lower bus, the load is provided by the power supply and the distributed power supply together, for the power supply side, the load provided by the load is small, and if a conventional protection strategy is adopted, the bus section switch 106 has the possibility of refusing to operate. Therefore, a protection strategy should be jointly formulated in connection with the output of the power supply and the output of the distributed power supply. As in one embodiment, for the bus-section switch 106, its operating current should be combined with the output current of the distributed power source 107 and the output current settings of the power source.
For the bus section with the fault, the self-healing strategy is to isolate the bus section and realize reverse power supply through a ring network switch so as to reduce the fault range.
Taking the bus-bar section on the right side of the bus-bar section switch 106 in fig. 1 as an example, if the bus-bar section has a fault, the bus-bar section switches on the two sides of the bus-bar section are switched off, and after the switching-off is completed, the bus-bar section on the right side of the bus-bar section loses power, so that the bus-bar section on the right side can be switched to supply by the upper bus-bar through the closed loop switch 105 shown in the figure, and the self-healing of the bus-bar section on the right side is realized.
For the transfer state, the bus of one ring network is connected to the other transfer through the transfer switch. Taking fig. 1 as an example, if the bus bar section switch 106 shown in the figure is opened and the second linking switch 109 is closed, the bus bar below the upper ring network is powered by the lower ring network. At this time, the distributed power supply 107 is connected to the lower ring network, and the distributed power supply 107 simultaneously supplies power to the lower bus of the upper ring network and the upper bus of the lower ring network.
For the lower bus of the upper ring network, the lower bus is only powered by the distributed power supply 107, and the lower bus is powered by a single power supply, so that the lower bus is suitable for a conventional protection strategy. For the lower bus of the lower ring network, the lower bus only has power supply, belongs to single power supply, and is also suitable for the conventional protection strategy, so the protection strategy is not adjusted.
For the upper bus of the lower ring network, the head end of the upper bus is powered by a power supply, and the tail end of the upper bus is powered by a distributed power supply 107, which belongs to a dual power supply mode, so that adaptive adjustment should be performed. The lower looped network is determined as a policy adjustment looped network, and the upper bus of the lower looped network is determined as a policy adjustment bus.
Because the two power supplies supply power for the upper bus of the lower ring network, the output load of the power supplies is only a part of the load, and therefore, when the protection strategy is adjusted, the adjustment should be performed in combination with the output loads of the lower power supply and the distributed power supply.
For the self-healing aspect, if a certain bus section has a fault, a mode of isolating the bus section and closing the loop closing switch is also adopted, and the step is the same as the self-healing strategy of the non-transfer state, and is not repeated.
The embodiment of the method for protecting and self-healing the power distribution network is applied to the power distribution network with the distributed power supplies, and the distributed power supplies of the power distribution network are connected to the power grid through the interconnection lines, so that fewer grid-connected lines can be arranged, the looped network to be connected to the power grid is selected, capacity increase is carried out on the lines needing capacity increase, and line loss caused by long-distance power supply can be reduced. Based on the network topology form, the method provided by the invention provides a protection strategy and a self-healing method by combining the distributed power supply aiming at two most common forms of transfer power supply and non-transfer power supply, and solves the problem that the protection strategy of the power distribution network with the distributed power supply is easy to cause misoperation or failure of a protection device.
It should be understood that the sequence numbers of the steps in the above embodiments do not mean the execution sequence, and the execution sequence of each process should be determined by the function and the inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The following are apparatus embodiments of the invention, and for details not described in detail therein, reference may be made to the corresponding method embodiments described above.
Fig. 3 is a functional block diagram of a power distribution network protection and self-healing device according to an embodiment of the present invention, and referring to fig. 3, the power distribution network protection and self-healing device 3 includes: a state acquisition module 301, a topology determination module 302, and a protection and self-healing module 303.
The state acquisition module 301 is configured to acquire a state of the ring network and states of switches at each section of the ring network, where the state of the ring network includes a load of a bus section and a load of a feeder line;
a topology determining module 302, configured to determine a topology structure of the power distribution network according to the states of the switches;
and the protection and self-healing module 303 is configured to determine a protection policy and a self-healing policy according to the state of the ring network and the topology structure.
Fig. 4 is a functional block diagram of a terminal according to an embodiment of the present invention. As shown in fig. 4, the server 4 of this embodiment includes: a processor 400, a memory 401 and a computer program 402 stored in said memory 401 and executable on said processor 400. The processor 400 executes the computer program 402 to implement the above-mentioned methods for protecting and self-healing a distribution network and the steps of the embodiments, such as the steps 101 to 103 shown in fig. 2.
Illustratively, the computer program 402 may be partitioned into one or more modules/units, which are stored in the memory 401 and executed by the processor 400 to implement the present invention.
The server 4 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The server 4 may include, but is not limited to, a processor 400, a memory 401. Those skilled in the art will appreciate that fig. 4 is merely an example of a server 4 and does not constitute a limitation of server 4 and may include more or fewer components than shown, or some components in combination, or different components, e.g., the terminal may also include input output devices, network access devices, buses, etc.
The Processor 400 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 401 may be an internal storage unit of the server 4, such as a hard disk or a memory of the server 4. The memory 401 may also be an external storage device of the server 4, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the server 4. Further, the memory 401 may also include both an internal storage unit of the server 4 and an external storage device. The memory 401 is used for storing the computer program and other programs and data required by the terminal. The memory 401 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit, and the integrated unit may be implemented in a form of hardware, or may be implemented in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the description of each embodiment is focused on, and for parts that are not described or illustrated in detail in a certain embodiment, reference may be made to the description of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other manners. For example, the above-described apparatus/terminal embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method according to the above embodiments may be implemented by a computer program, which may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the steps of the embodiments of the power distribution network protection and self-healing method and the power distribution network protection and self-healing apparatus may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a distribution network protection and self-healing system which characterized in that includes:
the server comprises a server and a plurality of terminal devices, wherein the plurality of terminal devices are in signal connection with the server;
the terminal device is applied to a power distribution network, and the power distribution network comprises: the device comprises at least two looped networks, a transfer switch and a distributed power supply;
the ring networks are connected through the transfer switch, the distributed power supply can be selectively connected with one of the ring networks, the terminal device is used for collecting the state of the ring network and the state of each switch of the ring network, the server generates a control command according to the state of the ring network and the state of each switch of the ring network, and the terminal device controls the opening and closing of each switch according to the control command.
2. The power distribution network protection and self-healing system according to claim 1, wherein each of the ring networks includes: a power supply and two bus bars; each of the switches includes: a loop closing switch;
the first ends of the two buses are respectively electrically connected with the power supply, and the second ends of the two buses are electrically connected through the loop closing switch;
the transfer switch comprises a first interconnection switch and a second interconnection switch, the second end of the first interconnection switch is connected with the first end of the second interconnection switch, and the first end of the first interconnection switch and the second end of the second interconnection switch are respectively connected with the second ends of the buses of two different looped networks.
3. The power distribution network protection and self-healing system according to claim 2, wherein each of the switches further comprises: the bus comprises a plurality of bus sections, two ends of each bus section are electrically connected with the two section switches respectively, one end of each feeder switch is electrically connected with the corresponding bus section, and the other end of each feeder switch is electrically connected with the corresponding feeder.
4. A power distribution network protection and self-healing system according to claim 3, wherein the distributed power source is connected to the second end of the first interconnection switch and the first end of the second interconnection switch.
5. A power distribution network protection and self-healing method applied to the power distribution network according to claim 3, the power distribution network protection and self-healing method comprising:
acquiring the state of the looped network and the state of each switch of the looped network, wherein the state of the looped network comprises the load of a bus section and the load of a feeder line;
determining a topological structure of the power distribution network according to the states of the switches;
and determining a protection strategy and a self-healing strategy according to the state of the ring network and the topological structure.
6. The power distribution network protection and self-healing method according to claim 5, wherein the determining a protection policy and a self-healing policy according to the states of the respective lines and the topology includes:
if the topological structure is in a non-transfer state, determining a bus of the distributed power supply grid connection as a strategy adjusting bus;
determining a looped network where the strategy adjusting bus is located as a strategy adjusting looped network;
acquiring an output load of a ring network power supply and an output load of the distributed power supply, wherein the output load of the ring network power supply is a load output by the strategy adjusting ring network to the strategy adjusting bus;
determining a bus section with a fault according to the output load of the ring network power supply and the output load of the distributed power supply;
and switching on the switches at the two ends of the fault bus section and switching off the loop closing switch of the bus where the fault bus section is located.
7. The power distribution network protection and self-healing method according to claim 5, wherein the determining a protection policy and a self-healing policy according to the states of the respective lines and the topology includes:
if the topological structure is in a switching state, determining that the bus of the distributed power supply grid connection is a strategy adjustment bus, and determining that the bus supplied with power through the switching switch is a switching power supply bus;
determining a looped network where the strategy adjusting bus is located as a strategy adjusting looped network;
acquiring an output load of a ring network power supply, an output load of the distributed power supply and a power transfer load, wherein the output load of the ring network power supply is a load output to the strategy adjustment bus by the strategy adjustment ring network, and the power transfer load is a load of the power transfer bus;
determining a bus section with a fault according to the output load of the ring network power supply, the output load of the distributed power supply and the power transfer load;
and switching on the switches at the two ends of the fault bus section and switching off the loop closing switch of the bus where the fault bus section is located.
8. The utility model provides a distribution network protection and self-healing device which characterized in that includes:
the state acquisition module is used for acquiring the state of a ring network and the state of each switch of the ring network, wherein the state of the ring network comprises the load of a bus section and the load of a feeder line;
the topology determining module is used for determining the topological structure of the power distribution network according to the states of the switches of all the sections;
and the number of the first and second groups,
and the protection and self-healing module is used for determining a protection strategy and a self-healing strategy according to the state of the ring network and the topological structure.
9. A server comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of the preceding claims 5 to 7 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 5 to 7.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115579871A (en) * | 2022-10-13 | 2023-01-06 | 国网河北省电力有限公司营销服务中心 | Distributed power supply infiltration power distribution network and photovoltaic absorption method |
| CN116154778A (en) * | 2023-04-19 | 2023-05-23 | 广东电网有限责任公司佛山供电局 | Automatic analysis method, device and equipment for first-segment looped network of power distribution network |
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- 2022-02-18 CN CN202210151983.3A patent/CN114465212A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115579871A (en) * | 2022-10-13 | 2023-01-06 | 国网河北省电力有限公司营销服务中心 | Distributed power supply infiltration power distribution network and photovoltaic absorption method |
| CN115579871B (en) * | 2022-10-13 | 2024-02-23 | 国网河北省电力有限公司营销服务中心 | Distribution network with distributed power source penetration and photovoltaic digestion method |
| CN116154778A (en) * | 2023-04-19 | 2023-05-23 | 广东电网有限责任公司佛山供电局 | Automatic analysis method, device and equipment for first-segment looped network of power distribution network |
| CN116154778B (en) * | 2023-04-19 | 2023-07-04 | 广东电网有限责任公司佛山供电局 | Automatic analysis method, device and equipment for first-segment looped network of power distribution network |
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