CN113572193B - Distributed power island operation state identification method, fusion terminal and system - Google Patents
Distributed power island operation state identification method, fusion terminal and system Download PDFInfo
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- CN113572193B CN113572193B CN202110744226.2A CN202110744226A CN113572193B CN 113572193 B CN113572193 B CN 113572193B CN 202110744226 A CN202110744226 A CN 202110744226A CN 113572193 B CN113572193 B CN 113572193B
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 230000004927 fusion Effects 0.000 title claims abstract description 48
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- 230000009471 action Effects 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 7
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004128 high performance liquid chromatography Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 206010014357 Electric shock Diseases 0.000 description 1
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Classifications
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- 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
-
- 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
- Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
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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)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention is suitable for the technical field of power grids, and provides a distributed power island operation state identification method, a fusion terminal and a system, wherein the method comprises the following steps: receiving a switch tripping type sent by a main switch of a station area; if the switch tripping type is short-circuit protection tripping, determining that island operation exists in the station area when the first preset condition is not met. The first preset condition is that equipment power failure information of at least one intelligent equipment of each island operation area in the platform area is received within a first preset time period after the platform area main switch is tripped; the platform region comprises at least one island operation region, and the island operation region is an operation region for protecting a distributed power supply under the same branch switch in the platform region. The method provided by the invention can accurately and efficiently determine whether the island operation condition exists in the platform region, and ensure the safe operation of the platform region where the distributed power supply is located.
Description
Technical Field
The invention belongs to the technical field of power grids, and particularly relates to a distributed power island operation state identification method, a fusion terminal and a system.
Background
In recent years, clean energy sources typified by photovoltaic power generation have been developed. Photovoltaic power generation becomes an effective way for meeting load growth requirements, reducing environmental pollution and improving comprehensive energy utilization efficiency. A large number of distributed photovoltaic access distribution networks convert the traditional passive distribution network into a multi-source distribution network, and higher requirements are provided for operation and maintenance operation of the power network.
In the power distribution network, equipment such as a distributed photovoltaic inverter and a grid-connected point breaking switch has the characteristics of small scale and distributed points, and a user is difficult to check and maintain by himself. If malfunction such as malfunction and non-action occurs in the anti-islanding device of the distributed photovoltaic power supply, users and manufacturers are difficult to perform timely and effective treatment, and safety risks can be brought to power grid operation. For example, during maintenance of equipment, the operation state of low-voltage photovoltaic equipment cannot be monitored or controlled, and it is difficult to perform power failure operation or set safety measures on the equipment at the user side. If the user blindly transmits power or the anti-islanding device fails to cause the photovoltaic power supply to reversely transmit power to the medium-voltage power grid, the risk of electric shock of operators can be caused. On the other hand, when the long-time power failure phenomenon occurs, if the island operation state cannot be mastered in time, safety measures such as power failure, electricity inspection and grounding are needed to be carried out on the side of the distribution transformer of the transformer area, isolating switches of the parallel grid points of the distributed photovoltaic power supply connected to the power grid are also needed to be disconnected one by one, measures such as grounding, insulating shielding, locking or hanging a signboard at the disconnection point are adopted to prevent reverse power transmission, and the power failure time length is prolonged. Traditionally, a special detection and identification system is required to be arranged for identifying the distributed power island, and the efficiency is low.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a method, a fusion terminal and a system for identifying the running state of a distributed power island, which can accurately and efficiently identify the running state of the distributed power island and ensure the safety of the system.
A first aspect of an embodiment of the present invention provides a method for identifying an island operation state of a distributed power supply, which is applied to a fusion terminal, where the fusion terminal is deployed in a platform area including the distributed power supply, and the method includes:
Receiving a switch tripping type sent by a main switch of a station area;
if the switch tripping type is short-circuit fault protection tripping, determining that island operation exists in the station area when the first preset condition is not met;
the first preset condition is that equipment power failure information of at least one intelligent equipment in each island operation area in the platform area is received within a first preset time period after the platform area main switch is tripped; the station area comprises at least one island operation area; the island operation area is an operation area containing the distributed power supply under the same branch switch in the platform area.
A second aspect of an embodiment of the present invention provides a distributed power island operation status identifying device, which is applied to a fusion terminal, where the fusion terminal is deployed in a platform area including a distributed power, and the device includes:
the first receiving module is used for receiving a switch tripping type sent after a total switch of the station area;
The first judging module is used for determining that island operation exists in the transformer area when a first preset condition is not met if the switch tripping type is short-circuit fault protection tripping; the first preset condition is that equipment power failure information of at least one intelligent equipment in each island operation area in the platform area is received within a first preset time period after the platform area main switch is tripped; the station area comprises at least one island operation area; the island operation area is an operation area containing the distributed power supply under the same branch switch in the platform area.
A third aspect of the embodiments of the present invention provides a fusion terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method as described above when executing the computer program.
A fourth aspect of the embodiment of the present invention provides a system for identifying an island operation state of a distributed power supply, where the system is deployed in a platform area including the distributed power supply, and the system includes a fusion terminal as described above, a platform area master switch of the platform area, and an intelligent device of an island operation area in the platform area; wherein each island run comprises at least one intelligent device;
the main switch of the platform area is used for sending a switch tripping type to the fusion terminal;
And each intelligent device is used for sending device power failure information to the fusion terminal when power fails.
A fifth aspect of the embodiments of the present invention provides a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method as described above.
A sixth aspect of the embodiments of the present invention provides a computer program product for causing an electronic device to perform the steps of the method of any one of the first aspects described above when the computer program product is run on a converged terminal.
Compared with the prior art, the embodiment of the invention has the beneficial effects that: the method for identifying the running state of the distributed power island provided by the embodiment of the invention comprises the following steps: receiving a switch tripping type sent by a main switch of a station area; if the switch tripping type is short-circuit protection tripping, determining that island operation exists in the station area when the first preset condition is not met. The first preset condition is that equipment power failure information of at least one intelligent equipment of each island operation area in the platform area is received within a first preset time period after the platform area main switch is tripped; the platform region comprises at least one island operation region, and the island operation region is an operation region for protecting a distributed power supply under the same branch switch in the platform region. The method provided by the embodiment of the invention can accurately and efficiently determine whether the island operation condition exists in the platform region, and ensure the safe operation of the platform region where the distributed power supply is located.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a distributed power island status recognition system according to an embodiment of the present invention;
Fig. 2 is a schematic implementation flow chart of a distributed power island state identification method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a further implementation flow of a distributed power island status identification method according to an embodiment of the present invention;
Fig. 4 is a schematic structural diagram of a distributed power island status recognition device according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a fusion terminal 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 the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present 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, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to illustrate the technical scheme of the invention, the following description is made by specific examples.
Fig. 1 shows a schematic structural diagram of a distributed power island status recognition system according to an embodiment of the present invention. Referring to fig. 1, the distributed power island status recognition system provided in this embodiment is deployed in a platform area including a distributed power, and the system may include a fusion terminal 110, a platform area master switch 121, and an intelligent device.
In particular, the distributed power source comprises photovoltaic 141 to 144 and the smart device comprises 130 to 139. Optionally, the intelligent devices 130, 131, 134 and 135 are photovoltaic inverter switches, and the intelligent devices 132, 133, 136, 137, 138 and 139 are load electric meters.
The fusion terminal 110 is configured to execute the distributed power island operation state identification method provided by the embodiment of the present invention.
In some embodiments, the zone master switch 121 is used to send the switch trip type to the fusion terminal.
In some embodiments, each smart device is configured to send device outage information to the converged terminal upon outage.
Referring to fig. 1, the distributed power island status recognition system provided by the embodiment of the present invention may further include a branch switch. Specifically, the branch switches include 122 to 129, and the branch switches are the distribution box of the transformer area and the switches in the branch box except for the main switch of the transformer area.
In some embodiments, each branch switch is configured to send switch outage information to the fusion terminal 110 upon outage.
In some embodiments, a zone master switch 121, various branch switches, and various intelligent devices within a zone are all communicatively coupled to convergence terminal 110.
Alternatively, the station areas are divided into a distribution box 161, a first branch box 162, a second branch box 163, a first island operation area 164, a second island operation area 165, and a normal operation area 166.
The distribution box comprises a main switch 121, a branch switch 122 and a branch switch 123. The first branch box 162 includes a branch switch 124, a branch switch 125, and a branch switch 126 therein. The second branch box 163 includes a branch switch 127, a branch switch 128, and a branch switch 129.
First island operation region 164 is an island operation region downstream of branch switch 122, branch switch 124, and branch switch 125; the second island operation 165 is an island operation downstream of the branch switch 123, the branch switch 127, and the branch switch 128.
Since the normal operation region 166 does not include any distributed power source, the normal operation region 166 is not an island operation region, and no judgment is required for the normal operation region 166 in island operation state identification.
It should be noted that fig. 1 only shows a structure directly related to the distributed power island operation state identification system in the transformer area, and other partial structures are omitted.
Fig. 2 shows a schematic implementation flow chart of a distributed power island operation state identification method according to an embodiment of the present invention. The method is applied to the fusion terminal as an example, but is not limited thereto. Referring to fig. 2, the method may include steps S101 to S102.
S101: the switch tripping type sent by the total switch of the receiving station area.
S102: and if the switch tripping type is short-circuit fault protection tripping, determining that island operation exists in the transformer area when the first preset condition is not met.
The first preset condition is that equipment power failure information of at least one intelligent equipment in each island operation area in the platform area is received within a first preset time period after the platform area main switch is tripped. The bay includes at least one island run. The island operation area is an operation area containing distributed power supplies under the same branch switch in the platform area.
In some embodiments, the method further comprises step 103.
103: And when the first preset condition is met, determining that the island operation does not exist in the station area.
Referring to fig. 1, in some embodiments, a fault occurs at F2 inside the bay, where both the external main power supply and the photovoltaic will generate a short circuit current at the point of the fault. At this time, the zone master switch 121 short-circuits the protection trip and transmits the switch trip type to the convergence terminal 110.
After receiving the switch tripping type of the short-circuit protection tripping, the fusion terminal 110 judges whether the first preset condition is met, and if the first preset condition is not met, the island operation in the transformer area is determined. If the first preset condition is met, determining that island operation does not exist in the platform region.
In this embodiment, the first preset condition is that, within a first preset period after the main switch 121 of the transformer area trips, equipment outage information of at least one intelligent device in the first island operation area 164 is received, and equipment outage information of at least one intelligent device in the second island operation area 165 is received.
In some embodiments, the first preset time period is longer than the off-grid action time of the downstream photovoltaic inverter, and the first preset time period is longer than the action setting time of the anti-islanding protection switch connected with the photovoltaic inverter.
Taking the first isolated island operation area 164 as an example, under the condition that the anti-isolated island protection switch in the first operation area 164 works normally, if the main switch 121 of the transformer area is tripped by short-circuit protection, the anti-isolated island protection switch in the isolated island operation area 164 operates within a first preset duration. If the anti-islanding protection switch is operated, at least one of the intelligent devices 130 to 133 will power down and send device power down information to the converged terminal 110. The second island operation 165 operates in the same manner as the first island operation.
If the fusion terminal 110 receives the equipment outage information of at least one intelligent device in the first island operation area 164 and receives the equipment outage information of at least one intelligent device in the second island operation area 165 within a first preset time period after the short-circuit protection trip occurs in the main switch 121 of the island, the situation indicates that the anti-island protection switches in the two island operation areas are all operating normally and island operation is not present in the island.
If the fusion terminal 110 does not receive the power failure information of any intelligent device in an island operation area within a first preset time period after the total switch 121 of the island has short-circuit protection trip, it indicates that the anti-island protection switch in the island operation area does not operate normally, that is, is in an island operation state.
In some embodiments, the zone master switch 121 communicates with the convergence terminal 110 via an RS485 connection. The intelligent device communicates with the zone fusion terminal 110 via a broadband power line carrier (broadband power linecarrier, HPLC).
In some embodiments, the intelligent switch in the intelligent device has a coupling transmission function, i.e. after the switch is opened, the HPLC signal can be transmitted through the coupling branch of the circuit breaker.
In one embodiment of the present invention, after S101, the method further includes: steps S104 to S105.
S104: and if the switch tripping type is anti-island protection tripping, determining that island operation exists in the station area when a second preset condition is met.
S105: and if the switch tripping type is anti-island protection tripping, determining that island operation does not exist in the platform region when the second preset condition is not met.
The second preset condition is that the inlet voltage before tripping of the main switch of the platform area is larger than a preset voltage threshold.
Referring to fig. 1, when a fault occurs at F1 outside the bay, the bay total switch 121 detects a sudden change in voltage frequency and performs anti-islanding protection trip after detecting a third preset time period after the sudden change. The bay total switch 121 transmits the switch trip type of the above-described anti-island protection trip to the convergence terminal 110.
After receiving the switch tripping type of the anti-island protection tripping, the fusion terminal 110 determines whether the second preset condition is met, thereby determining whether island operation exists in the transformer area.
In this embodiment, the third preset time period is longer than the off-grid action time of the downstream photovoltaic inverter, and the first preset time period is longer than the action setting time of the anti-islanding protection switch connected with the photovoltaic inverter.
Specifically, under the condition that the anti-island protection switches in the first island operation area 164 and the second island operation area 165 can work normally, in the third preset time period when the fault occurs at the F1, the anti-island protection device stops outputting the distributed power supply in the island operation area, that is, before the main switch 121 of the transformer area performs anti-island protection tripping, the inlet voltage of the main switch of the transformer area falls below the preset voltage threshold, and no island operation exists in the transformer area.
Conversely, if the anti-island protection switches in the first island operation area 164 and the second island operation area 165 have faults, and the distributed power supply cannot stop outputting after the fault occurs at the F1, the distributed power supply still outputs outwards before the main switch 121 of the platform performs anti-island protection tripping, the inlet voltage of the main switch 121 of the platform is greater than the preset voltage threshold, and island operation exists in the platform.
In one embodiment of the present invention, determining the second preset condition may include one or both of two ways.
Mode one: and receiving an inlet voltage state identifier sent by the total switch of the platform area, wherein the inlet voltage state identifier comprises a first state value and a second state value, the first state value represents that the inlet voltage of the total switch of the platform area before tripping is larger than the preset voltage threshold, and the second state value represents that the inlet voltage of the total switch of the platform area before tripping is smaller than or equal to the preset voltage threshold. And when the received inlet voltage state identifier is a first state value, determining that the second preset condition is met.
Mode two: and receiving the inlet voltage of the main switch of the platform area before tripping, which is sent by the main switch of the platform area after tripping. Comparing the magnitude of the inlet voltage with the magnitude of the preset voltage threshold. And when the inlet voltage is larger than the preset voltage threshold value, determining that the second preset condition is met.
Optionally, the preset voltage is preset to eighty percent of the rated voltage.
In one embodiment of the present invention, the method further comprises: step S106.
S106: under the condition that the switch tripping type sent by the main switch of the platform area is not received, if the switch power failure information of at least one branch switch is received, determining that island operation exists in the platform area when a third preset condition is not met; and when the third preset condition is met, determining that island operation does not exist in the platform region.
And the third preset condition is that in a second preset time period after the switch power failure information is received, for each branch switch for sending the switch power failure information, the equipment power failure information of at least one intelligent equipment is received in an island operation area at the downstream of the branch switch.
In this embodiment, the second preset time period is longer than the off-grid action time of the downstream photovoltaic inverter, and the first preset time period is longer than the action setting time of the anti-islanding protection switch connected with the photovoltaic inverter.
Referring to fig. 1, the island operation region downstream of branch switch 122, branch switch 124, and branch switch 125 is first island operation region 164; the island operation region downstream of the branch switch 123, the branch switch 127, and the branch switch 128 is the second island operation region 165. There is no operating zone downstream of the branch switch 126 and the operating zone downstream of the branch switch 129 is the normal operating zone 166.
When there is a fault in the bay, the bay master switch 121 is not tripped, that is, if the branch switch 127 is tripped under the condition that the fusion terminal 110 does not receive the switch tripping type sent by the bay master switch 121, the branch switch 127 sends switch power failure information to the fusion terminal 110.
If the anti-islanding protection switch in the second islanding operation area 165 is normal, the anti-islanding protection switch operates within a second preset time period after the branch switch 127 trips. When the anti-islanding protection switch is actuated, at least one of the intelligent devices 134 to 137 will power down and the powered down intelligent device will send device power down information to the converged terminal 110. At this time, the third preset condition is satisfied, and island operation does not exist in the platform region.
If the anti-island protection switch in the second island operation area 165 is abnormal, the anti-island protection switch cannot normally operate within a second preset time period after the adjustment of the branch switch 127, and none of the intelligent devices 134 to 137 sends device power failure information to the fusion terminal 110. At this time, the third preset condition is not satisfied, and island operation exists in the platform region.
On the other hand, since the normal operation region 166 does not include the distributed power supply, it is not necessary to determine the operation state of the intelligent device in the normal operation region 166.
The method for identifying the running state of the distributed power island provided by the embodiment of the invention can identify the running state of the distributed power island based on broadband power line carrier communication, a power distribution internet of things communication technology and a power failure reporting mechanism on the premise of long line and wide distribution of the low-voltage power distribution network, accords with the actual running condition of a platform area, and is easy to realize. Because the tripping type of the switch, the power failure information of the switch and the power failure information of the equipment can be obtained in real time, the method provided by the embodiment of the invention can rapidly and effectively judge whether the island operation state of the distributed power supply exists in the area or not when the outside faults exist in the area under the premise of not adding a special acquisition terminal, and the island operation state of the area is uploaded to the master station through the fusion terminal, so that the guarantee is provided for the management and the safe operation of the distributed power supply.
Fig. 3 shows a flowchart of still another implementation of the distributed power island operation status identification method according to the embodiment of the present invention. Referring to fig. 3, in a specific embodiment, an anti-islanding protection trip state G is defined, where when the total switch of the transformer area is an anti-islanding protection trip, g=1, otherwise g=0. And defining the voltage state before the tripping of the main switch of the transformer area as Y, wherein when the voltage before the tripping of the main switch of the transformer area is more than eighty percent of rated voltage, Y=1, otherwise Y=0. And defining a short-circuit protection state D of the main switch of the transformer area, wherein D=1 when the short-circuit protection of the main switch of the transformer area is tripped, and D=0 otherwise.
When the outside of the transformer area breaks down, the transformer area main switch detects that the voltage and the frequency are suddenly changed, after the time delay of the second preset time length, the transformer area main switch trips, and the fused terminal anti-island protection trip state G and the voltage state Y before the transformer area main switch trips are given. If g=1 and y=1, then it is determined that island operation exists in the zone. If g=1 and y=0, then it is determined that island operation does not exist in the zone.
When a fault occurs in the station area, the station area main switch is in short-circuit protection trip, and D=1. If the power failure is reported to the fusion terminal by each island operation area within the first preset time after the short-circuit protection tripping of the main switch of the platform area, judging that the island operation does not exist in the platform area. If the island operation area which does not report the power failure to the fusion terminal exists in the first preset time after the short-circuit protection tripping of the main switch of the platform area, judging that island operation exists in the platform area.
When a fault occurs in the area, the main switch of the area is not tripped, but the fusion terminal receives the switch power failure information reported by a certain branch switch. And in a third preset time period after the power failure of the branch switch, if the island operation area at the downstream of the branch switch reports the power failure, judging that island operation does not exist in the station area. If the power failure is not reported in the island operation area at the downstream of the branch switch within a third preset time period after the power failure of the branch switch, judging that island operation exists in the station area.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a distributed power island operation status identifying device according to an embodiment of the present invention, referring to fig. 4, the distributed power island operation status identifying device 40 may include a switch trip type receiving module 410 and a first island operation judging module 420.
In some embodiments, the switch trip type receiving module 410 is configured to receive a switch trip type sent by a total zone switch of a zone.
In some embodiments, the first island operation determination module 420 is configured to determine that island operation exists in the transformer area when the first preset condition is not met if the switch trip type is a short-circuit fault protection trip.
The first preset condition is: and receiving equipment power failure information of at least one intelligent equipment of each island operation area in the transformer area within a first preset time period after the transformer area main switch is tripped. The station area comprises at least one island operation area, and the island operation area is an operation area containing distributed power supplies under the same branch switch.
The distributed power island operation state identification device provided by the embodiment of the invention can accurately and efficiently determine whether island operation conditions exist in the platform area or not, and ensure the safe operation of the platform area where the distributed power is located.
In some embodiments, the first preset time period is greater than the off-grid action time of the downstream photovoltaic inverter and greater than the action setting time of an anti-islanding protection switch connected with the photovoltaic inverter.
In some embodiments, the distributed power island operation status identifying device 40 may further include a second island operation determining module configured to determine that island operation does not exist in the area when the first preset condition is met.
In some embodiments, the distributed power island operation status identifying device 40 may further include a third island operation determining module, configured to determine that island operation exists in the transformer area when the second preset condition is met if the switch trip type is anti-island protection trip.
The second preset condition is that the inlet voltage before tripping of the main switch of the transformer area is larger than a preset voltage threshold.
In some embodiments, the distributed power island operation status identifying device 40 may further include a fourth island operation determining module, configured to determine that island operation does not exist in the transformer area when the second preset condition is not met if the switch trip type is anti-island protection trip.
In some embodiments, the third island operation determination module is specifically configured to: receiving an inlet voltage state identification mark sent by the main switch of the platform area, wherein the inlet voltage state identification mark comprises a first state value and a second state value, the first state value represents that the inlet voltage of the main switch of the platform area before tripping is larger than a preset voltage threshold value, and the second state value represents that the inlet voltage of the main switch of the platform area before tripping is smaller than or equal to the preset voltage threshold value. And when the received inlet voltage state identifier is a first state value, determining that a second preset condition is met.
In some embodiments, the third island operation determination module is specifically configured to: the method comprises the steps of receiving the inlet voltage of a zone master switch sent by the zone master switch after tripping and before tripping. Comparing the magnitude of the inlet voltage with a preset voltage threshold. And when the inlet voltage is larger than a preset voltage threshold value, determining that a second preset condition is met.
The first preset condition is that equipment power failure information of at least one intelligent equipment of each island operation area in the platform area is received within a first preset time period after the platform area main switch is tripped. The platform region comprises at least one island operation region, and the island operation region is an operation region for protecting a distributed power supply under the same branch switch in the platform region.
In some embodiments, the distributed power island operation status identifying device 40 may further include a fifth island operation judging module, configured to determine that island operation exists in the platform area when the third preset condition is not met if the switch power failure information of at least one branch switch is received under the condition that the switch tripping type sent by the platform area main switch is not received; and when the third preset condition is met, determining that island operation does not exist in the platform region.
The third preset condition is: and in the second preset time length when the power failure information of the switch is received, for each branch switch sending the power failure information of the switch, the power failure information of equipment of at least one intelligent equipment is received in an island operation area at the downstream of the branch switch.
Fig. 5 is a schematic diagram of a fusion terminal according to an embodiment of the present invention. As shown in fig. 5, the fusion terminal 50 of this embodiment includes: a processor 500, a memory 510, and a computer program 520, such as a distributed power island operating state identification program, stored in the memory 510 and executable on the processor 500. The steps of the above-described embodiments of the distributed island operation status identification method, such as steps S101 to S102 shown in fig. 2, are implemented by the processor 50 when executing the computer program 520. Or the processor 500, when executing the computer program 520, performs the functions of the modules/units of the apparatus embodiments described above, e.g., the functions of the modules 410 to 420 shown in fig. 4.
Illustratively, the computer program 520 may be partitioned into one or more modules/units that are stored in the memory 510 and executed by the processor 500 to accomplish the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program 520 in the fusion terminal 50. For example, the computer program 520 may be divided into a switch trip type receiving module and a first island operation judging module (a module in a virtual device).
The convergence terminal 50 may be a desktop computer, a notebook computer, a palm computer, a cloud server, or the like. The fusion terminal may include, but is not limited to, a processor 500, a memory 510. It will be appreciated by those skilled in the art that fig. 5 is merely an example of a converged terminal 50, and is not intended to limit the converged terminal 50, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the converged terminal may further include an input-output device, a network access device, a bus, etc.
The Processor 500 may be a central processing unit (Central Processing Unit, CPU), other general purpose Processor, digital signal Processor (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), off-the-shelf Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 510 may be an internal storage unit of the fusion terminal 50, for example, a hard disk or a memory of the fusion terminal 50. The memory 510 may also be an external storage device of the fusion terminal 50, such as a plug-in hard disk, a smart memory card (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, a flash memory card (FLASH CARD) or the like, which are provided on the fusion terminal 50. Further, the memory 510 may also include both an internal storage unit and an external storage device of the fusion terminal 50. The memory 510 is used to store the computer program and other programs and data required by the fusion terminal. The memory 510 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-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions 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 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/fusion terminal and method may be implemented in other manners. For example, the apparatus/fusion terminal embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical function division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown 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 may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. . Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (8)
1. The method is characterized by being applied to a fusion terminal, wherein the fusion terminal is deployed in a platform area comprising a distributed power supply, and the method comprises the following steps:
Receiving a switch tripping type sent by a main switch of a station area;
if the switch tripping type is short-circuit fault protection tripping, determining that island operation exists in the station area when the first preset condition is not met;
the first preset condition is that equipment power failure information of at least one intelligent equipment in each island operation area in the platform area is received within a first preset time period after the platform area main switch is tripped; the station area comprises at least one island operation area; the island operation area is an operation area containing the distributed power supply under the same branch switch in the platform area;
After the receiving the switch tripping type sent by the total switch of the station area after tripping, the method further comprises the following steps:
If the switch tripping type is anti-island protection tripping, determining that island operation exists in the station area when a second preset condition is met;
the second preset condition is that the inlet voltage before tripping of the main switch of the platform area is larger than a preset voltage threshold;
the method further comprises the steps of:
under the condition that the switch tripping type sent by the main switch of the platform area is not received, if the switch power failure information of at least one branch switch is received, determining that island operation exists in the platform area when a third preset condition is not met; when the third preset condition is met, determining that island operation does not exist in the platform area;
And the third preset condition is that in a second preset time period after the switch power failure information is received, for each branch switch for sending the switch power failure information, the equipment power failure information of at least one intelligent equipment is received in an island operation area at the downstream of the branch switch.
2. The method of claim 1, wherein if the switch trip type is a short circuit fault trip, the method further comprises:
and when the first preset condition is met, determining that island operation does not exist in the station area.
3. The method of claim 1, wherein if the switch trip type is anti-islanding protection trip, the method further comprises:
and when the second preset condition is not met, determining that island operation does not exist in the platform region.
4. The method of claim 1, wherein the method further comprises:
Receiving an inlet voltage state identifier sent by the main switch of the platform area, wherein the inlet voltage state identifier comprises a first state value and a second state value, the first state value represents that the inlet voltage of the main switch of the platform area before tripping is larger than the preset voltage threshold value, and the second state value represents that the inlet voltage of the main switch of the platform area before tripping is smaller than or equal to the preset voltage threshold value;
when the received inlet voltage state identifier is a first state value, determining that the second preset condition is met;
Or the method further comprises:
receiving the input voltage of the main switch of the platform area before tripping, which is sent by the main switch of the platform area after tripping;
comparing the magnitude of the inlet voltage with the preset voltage threshold;
and when the inlet voltage is larger than the preset voltage threshold value, determining that the second preset condition is met.
5. The method of any one of claims 1 to 4, wherein the first predetermined time period is greater than an off-grid action time of a downstream photovoltaic inverter and greater than an action setting time of an anti-islanding protection switch connected to the photovoltaic inverter.
6. A converged terminal 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 one of claims 1 to 5 when executing the computer program.
7. A distributed power island operation state identification system, which is characterized in that the system is deployed in a platform area containing a distributed power, and comprises the fusion terminal, a platform area master switch of the platform area and intelligent equipment of an island operation area in the platform area; wherein each island run comprises at least one intelligent device;
the main switch of the platform area is used for sending a switch tripping type to the fusion terminal;
And each intelligent device is used for sending device power failure information to the fusion terminal when power fails.
8. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any one of claims 1 to 5.
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| CN114744754B (en) * | 2022-03-15 | 2024-04-26 | 佳源科技股份有限公司 | Island-preventing operation control system and method applying low-voltage transformer area distributed photovoltaic access |
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| CN106992505A (en) * | 2017-04-27 | 2017-07-28 | 国网安徽省电力公司芜湖供电公司 | A kind of platform area anti-islanding protection system |
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| CN105703341A (en) * | 2015-11-24 | 2016-06-22 | 国网甘肃省电力公司 | Layered and domain-partitioned island protection method with non-fault-trip preventing function aiming at large-scale wind power plant |
| CN106992505A (en) * | 2017-04-27 | 2017-07-28 | 国网安徽省电力公司芜湖供电公司 | A kind of platform area anti-islanding protection system |
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