CN112865320A - Power grid self-healing control method and device based on power loss path information flow transfer and extremely poor flexibility - Google Patents
Power grid self-healing control method and device based on power loss path information flow transfer and extremely poor flexibility Download PDFInfo
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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
- H02J13/00006—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 characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
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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
- H02J13/00006—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 characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—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 characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
- H02J13/00017—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 characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus using optical fiber
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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
- H02J13/00006—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 characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00022—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 characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
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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
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
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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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
Abstract
The invention discloses a power grid self-healing control method and device based on power loss path information transfer and extremely poor flexibility, and aims to solve the technical problem that regional power supply cannot be quickly and accurately recovered in a complex power distribution system. It includes: after the power distribution network line trips, generating a self-healing message signal by using a protection device corresponding to the trip switch; transferring the self-healing message signals to the protection devices on the upstream and downstream of the trip switch through a communication network, and judging the electrified state of the protection device receiving the self-healing message signals according to a preset voltage value after each transfer; judging message circulation according to the charged state of the protection device; and acquiring a self-healing message signal when the circulation is terminated, and recovering power supply of the power-losing area by using a breaker switch according to the preset step time. The method and the device can quickly and accurately recover the power supply of the power-losing area in a short time, and greatly improve the power distribution automation self-healing recovery power supply capacity and probability.
Description
Technical Field
The invention relates to a power grid self-healing control method and device based on power loss path information transfer and extremely poor flexibility, and belongs to the technical field of power system relay protection.
Background
With the increase of power demand, the structure of a power distribution network of a power system becomes increasingly complex, and how to quickly and accurately recover power supply of a power loss load after a power grid fails or after electrical equipment is overhauled has a certain positive effect on improving the reliability of power supply of the power grid, reducing power failure time and improving production efficiency.
In a power distribution system, when a power grid fails or equipment is overhauled due to power failure, power transfer is generally realized through a power supply spare power automatic switching device, or power supply is recovered by reclosing after a line fails, however, in a complex regional power distribution system, a plurality of voltage nodes of the power system need to recover power supply, and the existing methods cannot reliably and accurately recover the power supply of the regional power distribution system in a short time.
Disclosure of Invention
In order to solve the problem that regional power supply cannot be quickly and accurately recovered in a complex power distribution system, the invention provides a power grid self-healing control method and a device thereof based on power loss path information transfer and extremely poor flexibility.
In order to solve the technical problems, the invention adopts the following technical means:
in a first aspect, the invention provides a power grid self-healing control method based on power loss path information flow transfer and extremely poor flexibility, which comprises the following steps:
after the power distribution network line trips, generating a self-healing message signal by using a protection device corresponding to the trip switch;
transferring the self-healing message signals to the protection devices on the upstream and downstream of the trip switch through a communication network, and judging the electrified state of the protection device receiving the self-healing message signals according to a preset voltage value after each transfer;
judging message circulation according to the charged state of the protection device;
and acquiring a self-healing message signal when the circulation is terminated, and recovering power supply of the power-losing area by using a breaker switch according to the preset step time.
With reference to the first aspect, further, the method further includes the following steps:
protection devices are respectively configured on a power distribution network line and a section switch, and a communication network is constructed between the protection devices by using an optical fiber or a wireless network.
With reference to the first aspect, further, the self-healing message signal includes a self-healing permission command and a message transfer frequencyn。
With reference to the first aspect, further, the circulation of the self-healing message signal includes intra-station circulation and extra-station circulation; the in-station circulation refers to self-healing message signal circulation among the protection devices of the internal lines of a single transformer substation, and the message format of the self-healing message signals circulated in the station is GOOSE; the out-of-station flow switching refers to the flow of self-healing message signals between the protection devices at two sides of the line connecting the two substations, and the self-healing message signals flowing out of the station are embedded in sampling data messages of the line longitudinal differential protection.
With reference to the first aspect, further, the specific operation of determining the charging state is as follows:
when a protection device receives a self-healing message signal, judging whether a branch in which the protection device is positioned is provided with a voltage sensor or not according to a voltage set value of the protection device;
when a branch where the protection device is located is provided with a voltage sensor, respectively acquiring bus voltage and branch voltage by using the voltage sensor, respectively comparing the bus voltage and the branch voltage with a preset voltage value, and when the bus voltage or the branch voltage is smaller than the preset voltage value, judging that a bus side or a branch side of a breaker switch corresponding to the protection device is uncharged, otherwise, judging that the bus side or the branch side of the breaker switch corresponding to the protection device is charged;
when the branch where the protection device is located is not provided with the voltage sensor, the voltage sensor is utilized to collect bus voltage, the bus voltage is compared with a preset voltage value, when the bus voltage is smaller than the preset voltage value, the bus side of the breaker switch corresponding to the protection device is judged to be uncharged, otherwise, the bus side of the breaker switch corresponding to the protection device is judged to be charged.
With reference to the first aspect, further, the specific operation of performing the message flow judgment according to the charged state of the protection device is as follows:
acquiring the electrified state of a breaker switch corresponding to the protection device receiving the self-healing message signal;
when both sides of the breaker switch are not electrified, the message conversion times in the self-healing message signal are updated, and the order is givenn=n+1, the updated self-healing message signal is forwarded to the adjacent protection device by using the protection device;
when one side of the breaker switch is electrified and the other side of the breaker switch is not electrified, the circulation of the self-healing message signals is stopped, and the automatic message signals of the current protection device are obtained.
With reference to the first aspect, further, the specific operation of recovering the power supply of the power loss area by using the breaker switch is as follows:
obtaining a self-healing message signal when the circulation is terminated, and determining a power loss area according to a protection device corresponding to the self-healing message signal when the circulation is terminated;
according to a preset step time TdelayAnd controlling the protection devices in the power failure area one by one to execute self-healing control logic, and controlling the closing of the breaker switch corresponding to each protection device according to the allowed self-healing command to recover the power supply of the power failure area.
With reference to the first aspect, further, the total duration of restoring the power supply to the power loss area isn*Tdelay， TdelayThe value range of (a) is 0.3-0.5 s.
In a second aspect, the present invention provides a power grid self-healing control device based on power loss path information flow transfer and extremely poor flexibility, including:
the message generating module is used for generating a self-healing message signal by utilizing a protection device corresponding to the trip switch after the power distribution network line trips;
the message transfer module is used for transferring the self-healing message signals to the protection devices on the upstream and downstream of the trip switch through a communication network and judging message transfer according to the charged state of the protection devices;
the electrified judging module is used for judging the electrified state of the protection device receiving the self-healing message signal according to a preset voltage value after each circulation of the self-healing message signal;
and the self-healing control module is used for recovering power supply of the power-losing area by utilizing the breaker switch according to the preset step time after the self-healing message signal flow is terminated.
With reference to the second aspect, further, the value range of the preset voltage value is 50V-100V; the value range of the preset step difference time is 0.3-0.5 s.
The following advantages can be obtained by adopting the technical means:
the invention provides a power grid self-healing control method and a device thereof based on power loss path information transfer and extremely poor flexibility. The method has low complexity, can accurately sense the working condition of primary equipment in a power loss area, and can realize flexible level difference control of a power distribution system by carrying out batch delayed switching on different protection devices, thereby greatly improving the power supply self-healing recovery capability and probability of power distribution automation. The method can quickly and accurately recover the power supply of the power loss area in a short time, and particularly has a positive effect on quick self-healing of the complex power distribution network after the complex power distribution network fails.
Drawings
FIG. 1 is a flowchart of steps of a power grid self-healing control method based on power loss path information transfer and extremely poor flexibility;
fig. 2 is an operation flowchart of a self-healing control method of a power grid in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a power distribution network of the power system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a power grid self-healing control device based on power loss path information flow conversion and extremely poor flexibility according to the present invention;
in the figure, 1 is a message generation module, 2 is a message transfer module, 3 is an electrified judgment module, and 4 is a self-healing control module.
Detailed Description
The technical scheme of the invention is further explained by combining the accompanying drawings as follows:
the invention provides a power grid self-healing control method based on power loss path information transfer and extremely poor flexibility, which specifically comprises the following steps as shown in figures 1 and 2:
and step A, respectively configuring protection devices on a power distribution network line and a section switch, and constructing a communication network between the protection devices by using an optical fiber or a wireless network. Fig. 3 is a block diagram of a power distribution network of an electric power system, in which a bus and each branch of the power distribution network are provided with a switch, and a protection device is generally configured in one switch, and each protection device is connected through an optical fiber or a wireless network to form a communication link between the protection devices. In addition, a bus in the power distribution network is provided with a voltage sensor, branch lines of the power distribution network are provided with the voltage sensor according to the planning design of the power distribution network, and generally, at least one side of each branch line is provided with the voltage sensor.
And B, after the power distribution network line trips, generating a self-healing message signal by using a protection device corresponding to the trip switch, wherein the self-healing message signal mainly comprises a self-healing allowing command and message transfer timesnWhen self-healing message signal is just generatedn=0。
And C, transferring the self-healing message signals to the protection devices at the upstream and downstream of the trip switch through a communication network, and judging the electrified state of the protection device receiving the self-healing message signals according to a preset voltage value after each transfer.
According to the complexity of the power distribution network, the circulation of the self-healing message signals can be divided into intra-station circulation and out-station circulation, wherein the intra-station circulation refers to the circulation of the self-healing message signals among the protection devices of the internal circuits of a single transformer substation, namely the self-healing message signals are only forwarded inside one transformer substation, and the message format of the self-healing message signals circulated in the station is GOOSE; the out-of-station flow transfer refers to the transfer of self-healing message signals between the protection devices at the two sides of the line connecting the two substations, the self-healing message signals can be transferred between at least 2 substations, and the self-healing message signals transferred out-of-station flow are embedded in sampling data of the line longitudinal differential protection.
The specific operation of judging the charged state in the embodiment of the invention is as follows:
and step C01, when a protection device receives the self-healing message signal, judging whether a branch circuit where the protection device is located is provided with a voltage sensor according to the voltage set value of the protection device, wherein the bus side is inevitably provided with the voltage sensor when the branch circuit appears on the bus in the power distribution network.
And C02, when a branch in which the protection device is located is provided with a voltage sensor, respectively acquiring bus voltage and branch voltage by using the voltage sensors on the bus and the branch, and respectively comparing the bus voltage and the branch voltage with preset voltage values, wherein the value range of the preset voltage values is 50V-100V, and preferably 70V. When the bus voltage or the branch voltage is smaller than the preset voltage value, the bus side or the branch side of the breaker switch corresponding to the protection device is judged to be uncharged, otherwise, the bus side or the branch side of the breaker switch corresponding to the protection device is judged to be charged.
And step C03, when a branch where the protection device is located is not provided with a voltage sensor, collecting bus voltage by using the voltage sensor on the bus, comparing the bus voltage with a preset voltage value, and when the bus voltage is smaller than the preset voltage value, judging that the bus side of the breaker switch corresponding to the protection device is not electrified, otherwise, judging that the bus side of the breaker switch corresponding to the protection device is electrified. The electrified state of the branch road side of the breaker switch corresponding to the protection device can be judged through the protection device on the opposite side of the branch road.
Step D, judging message flow according to the charged state of the protection device, and specifically operating as follows:
and D01, acquiring the electrified state of the breaker switch corresponding to the protection device receiving the self-healing message signal, and specifically dividing the electrified state into a bus side electrified state and a branch side electrified state.
Step D02, when both sides of the breaker switch are not electrified (namely, both the bus side and the branch side are not electrified), updating the message circulation times in the self-healing message signal to ordern=n+1, the updated self-healing message signal is forwarded to the adjacent protection device by using the protection device; when no voltage sensor is arranged on a branch of the breaker switch, the electrified state of the branch side cannot be judged, and the bus side is not electrified, the message is continuously transferred according to the operation.
And D03, when one side of the breaker switch is electrified and the other side of the breaker switch is not electrified, the protection device located at the edge of the power-off area is found, the circulation of the self-healing message signals is terminated, and the automatic message signals of the current protection device are obtained.
The protection device can respectively send self-healing message signals to upstream and downstream through a communication network, whether the messages need to be continuously transferred or not is judged according to the charged state of the protection device receiving the self-healing message signals, when the messages need to be continuously transferred, the protection device can send the self-healing message signals to the protection device on the same side, and if the protection device of the trip switch is P0The upstream protective devices are respectively P1、P2、P3… … the downstream protection devices are P-1、P-2、P-3… … acting as a protection device P1When both sides of (A) are not charged, P1Will add 1 to the message circulation times and send the updated self-healing message signal to P2。
Step E, obtaining a self-healing message signal when the circulation is terminated, and recovering power supply of a power-off area by using a breaker switch according to preset step time, wherein the operation is as follows:
step E01, obtaining the self-healing message signals when the circulation is terminated, and because the self-healing message signals exist in the upstream and downstream, when the circulation is completely terminated, the self-healing message signals in the upstream and downstream and the corresponding protection devices in the upstream and downstream should be obtained, respectively, and the power-loss area is determined according to the protection device corresponding to the self-healing message signals when the circulation is terminated.
Step E02, according to the self-healing allowing command in the self-healing message signal and the preset level difference time TdelayAnd controlling the protection devices in the power failure area one by one to execute self-healing control logic, and controlling the closing of the breaker switch corresponding to each protection device according to the allowed self-healing command to recover the power supply of the power failure area. In order to improve the stability and reliability of power supply, the circuit breaker switches are gradually closed inwards from the outermost periphery of a power loss area, the power supply is recovered section by section, and the closing time difference of two adjacent circuit breaker switches is TdelaySo that the whole power-off region passes throughn*TdelayThe power supply can be completely restored. In the embodiment of the invention, TdelayThe value range of (a) is 0.3-0.5 s.
The invention also provides a power grid self-healing control device based on power loss path information transfer and extremely poor flexibility, which mainly comprises a message generation module 1, a message transfer module 2, a live judgment module 3 and a self-healing control module 4 as shown in fig. 4. The message generation module is mainly used for generating a self-healing message signal by utilizing a protection device corresponding to the trip switch after the trip of the power distribution network line, wherein the self-healing message signal comprises a self-healing permission command and message transfer timesn(ii) a The message transfer module is used for transferring the self-healing message signals to the protection devices on the upstream and downstream of the trip switch through a communication network, and is used for judging message transfer according to the charged state of the protection devices; the charging judgment module is mainly used for judging the charging state of the protection device receiving the self-healing message signal according to a preset voltage value after each circulation of the self-healing message signal, wherein the value range of the preset voltage value is 50-100V, and 70V is preferred; the self-healing control module is mainly used for recovering power supply of a power-off area by utilizing a breaker switch according to preset step time after the self-healing message signal flow is terminated, wherein the value range of the preset step time is 0.3-0.5 s.
The method has low complexity, can accurately sense the working condition of primary equipment in a power loss area, and can realize flexible level difference control of a power distribution system by carrying out batch delayed switching on different protection devices, thereby greatly improving the power supply self-healing recovery capability and probability of power distribution automation. The method can quickly and accurately recover the power supply of the power loss area in a short time, and particularly has a positive effect on quick self-healing of the complex power distribution network after the complex power distribution network fails.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The power grid self-healing control method based on power loss path information flow transfer and extremely poor flexibility is characterized by comprising the following steps of:
after the power distribution network line trips, generating a self-healing message signal by using a protection device corresponding to the trip switch;
transferring the self-healing message signals to the protection devices on the upstream and downstream of the trip switch through a communication network, and judging the electrified state of the protection device receiving the self-healing message signals according to a preset voltage value after each transfer;
judging message circulation according to the charged state of the protection device;
and acquiring a self-healing message signal when the circulation is terminated, and recovering power supply of the power-losing area by using a breaker switch according to the preset step time.
2. The power grid self-healing control method based on power loss path information transfer and extremely poor flexibility according to claim 1, further comprising the steps of:
protection devices are respectively configured on a power distribution network line and a section switch, and a communication network is constructed between the protection devices by using an optical fiber or a wireless network.
3. The power grid self-healing control method based on power loss path information transfer and extremely poor flexibility according to claim 1, wherein the self-healing message signal comprises a self-healing allowing command and a message transfer frequencyn。
4. The power grid self-healing control method based on power loss path information flow transfer and extremely poor flexibility according to claim 1, wherein the flow of self-healing message signals comprises intra-station flow and extra-station flow; the in-station circulation refers to self-healing message signal circulation among the protection devices of the internal lines of a single transformer substation, and the message format of the self-healing message signals circulated in the station is GOOSE; the out-of-station flow switching refers to the flow of self-healing message signals between the protection devices at two sides of the line connecting the two substations, and the self-healing message signals flowing out of the station are embedded in sampling data messages of the line longitudinal differential protection.
5. The power grid self-healing control method based on power loss path information transfer and extremely poor flexibility according to claim 1, wherein the specific operation of judging the electrified state is as follows:
when a protection device receives a self-healing message signal, judging whether a branch in which the protection device is positioned is provided with a voltage sensor or not according to a voltage set value of the protection device;
when a branch where the protection device is located is provided with a voltage sensor, respectively acquiring bus voltage and branch voltage by using the voltage sensor, respectively comparing the bus voltage and the branch voltage with a preset voltage value, and when the bus voltage or the branch voltage is smaller than the preset voltage value, judging that a bus side or a branch side of a breaker switch corresponding to the protection device is uncharged, otherwise, judging that the bus side or the branch side of the breaker switch corresponding to the protection device is charged;
when the branch where the protection device is located is not provided with the voltage sensor, the voltage sensor is utilized to collect bus voltage, the bus voltage is compared with a preset voltage value, when the bus voltage is smaller than the preset voltage value, the bus side of the breaker switch corresponding to the protection device is judged to be uncharged, otherwise, the bus side of the breaker switch corresponding to the protection device is judged to be charged.
6. The power grid self-healing control method based on power loss path information transfer and extremely poor flexibility according to claim 3 or 5, wherein the specific operation of judging message transfer according to the charged state of the protection device is as follows:
acquiring the electrified state of a breaker switch corresponding to the protection device receiving the self-healing message signal;
when both sides of the breaker switch are not electrified, the message conversion times in the self-healing message signal are updated, and the order is givenn=n+1, the updated self-healing message signal is forwarded to the adjacent protection device by using the protection device;
when one side of the breaker switch is electrified and the other side of the breaker switch is not electrified, the circulation of the self-healing message signals is stopped, and the automatic message signals of the current protection device are obtained.
7. The power grid self-healing control method based on power loss path information flow transfer and extremely poor flexibility according to claim 6, wherein the specific operation of recovering power supply of a power loss area by using a breaker switch is as follows:
obtaining a self-healing message signal when the circulation is terminated, and determining a power loss area according to a protection device corresponding to the self-healing message signal when the circulation is terminated;
according to a preset step time TdelayAnd controlling the protection devices in the power failure area one by one to execute self-healing control logic, and controlling the closing of the breaker switch corresponding to each protection device according to the allowed self-healing command to recover the power supply of the power failure area.
8. The power grid self-healing control method based on power loss path information transfer and extremely poor flexibility according to claim 7, wherein the total duration of recovering power supply in a power loss area is as long asn*Tdelay， TdelayThe value range of (a) is 0.3-0.5 s.
9. Electric wire netting self-healing controlling means based on lose electric path information circulation and flexibility are extremely poor, its characterized in that includes:
the message generating module is used for generating a self-healing message signal by utilizing a protection device corresponding to the trip switch after the power distribution network line trips;
the message transfer module is used for transferring the self-healing message signals to the protection devices on the upstream and downstream of the trip switch through a communication network and judging message transfer according to the charged state of the protection devices;
the electrified judging module is used for judging the electrified state of the protection device receiving the self-healing message signal according to a preset voltage value after each circulation of the self-healing message signal;
and the self-healing control module is used for recovering power supply of the power-losing area by utilizing the breaker switch according to the preset step time after the self-healing message signal flow is terminated.
10. The power grid self-healing control device based on power loss path information flow transfer and extremely poor flexibility according to claim 9, wherein the preset voltage value ranges from 50V to 100V; the value range of the preset step difference time is 0.3-0.5 s.
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