CN111682591B - Anti-islanding protection method and device for low-voltage distributed power supply - Google Patents
Anti-islanding protection method and device for low-voltage distributed power supply Download PDFInfo
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- CN111682591B CN111682591B CN202010643555.3A CN202010643555A CN111682591B CN 111682591 B CN111682591 B CN 111682591B CN 202010643555 A CN202010643555 A CN 202010643555A CN 111682591 B CN111682591 B CN 111682591B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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Abstract
The invention provides an anti-islanding protection method and device for a low-voltage distributed power supply, which specifically comprise the following steps: the jurisdiction linkage module initiates a grid-connected request to a jurisdiction authentication subsystem, and enables the control module after obtaining a grid-connected allowable response; the control module forms a grid-connected switch control command according to the instructions sent by the reverse power monitoring module, the power quality monitoring module and the district linkage module and sends the grid-connected switch control command to the grid-connected switch module; and the grid-connected switch module executes connection or disconnection of the grid-connected switch according to the control command of the grid-connected switch, so that the low-voltage distributed power supply is safely and reliably incorporated into the power grid system. By adopting the method, the grid-connected switch control command is formed after the power grid detection results of the device and other devices in the jurisdiction are jointly considered, so that the accuracy of the anti-arc island protection is greatly improved, the safety of the distributed power supply merging into the power grid is effectively ensured, and the effective operation of the whole power grid system is ensured.
Description
Technical Field
The invention belongs to the field of electric power, and particularly relates to an anti-islanding protection method for a low-voltage distributed power supply.
Background
The anti-island protection device is an important protection device of a distributed power supply of a power distribution room, the anti-island protection device is provided with an active mode and a passive mode, the active mode comprises frequency on the high side, active power and reactive power variation, the passive mode comprises voltage phase jumping and frequency variation, an island protection tripping outlet is generally connected to a grid-connected circuit breaker, and the grid-connected circuit breaker is cut off when an island phenomenon occurs. Therefore, the anti-islanding protection device needs to accurately detect the voltage and the frequency of a grid-connected point, then the grid-connected switch is disconnected when the voltage and the frequency fluctuate and are larger than a preset threshold value, and the anti-islanding protection device installed at a distributed power supply demarcation point at present still needs to be improved due to the reasons of equipment sensitivity or equipment failure rate, and the like, so that the equipment power failure detection at the power supply side causes great potential safety hazards, and the problems of equipment damage, equipment aggravation aging and the like of a distributed power supply subsystem are easily caused.
Disclosure of Invention
The invention aims to provide an anti-islanding protection method and device for a low-voltage distributed power supply, which are used for improving the accuracy of anti-islanding control and improving the service life of distributed power supply equipment.
The technical scheme of the technical problem to be solved by the invention is as follows: an anti-islanding protection method for a low-voltage distributed power supply is characterized by comprising the following steps: the anti-island protection device of the low-voltage distributed power supply comprises an administration linkage module, a control module, a power quality monitoring module, a reverse power monitoring module, a grid-connected switch module, a second current mutual inductance module, a transformer, a first current mutual inductance module and the low-voltage distributed power supply;
the method comprises the following steps:
step 1: the jurisdiction linkage module initiates a grid-connected request to a jurisdiction authentication subsystem, and enables the control module after obtaining a grid-connected allowable response;
step 2: the control module forms a grid-connected switch control command according to the instructions sent by the reverse power monitoring module, the power quality monitoring module and the district linkage module and sends the grid-connected switch control command to the grid-connected switch module;
and step 3: the grid-connected switch module controls the on-off of the grid-connected switch according to the grid-connected switch control command, so that the low-voltage distributed power supply can be safely and reliably incorporated into a power grid system.
Preferably, in the step 1, the grid connection request at least includes an identity ID and location information of the distributed power supply; the grid connection permission response information at least comprises permission indication and a group ID to which the identity ID of the distributed power supply belongs.
Preferably, in step 1, after obtaining the grid-connected allowable response, the jurisdiction linkage module reports an abnormal detection state of the distributed power supply with respect to the incorporated power grid to the authentication subsystem according to a preset mode; the preset mode comprises periodic reporting and reporting based on abnormal events.
Preferably, in steps 1 and 2, after obtaining the grid-connected permission response, the jurisdiction linkage module periodically detects abnormal state information about each group ID broadcast by the authentication subsystem, and sends the abnormal state information to the control module.
Preferably, in step 2, the power quality monitoring module detects the power supply quality of the electric energy entering the grid-connected switch, generates power supply quality abnormal indication information and sends the power supply quality abnormal indication information to the control module when low frequency, excessive frequency, low voltage and overvoltage occur, and generates power supply quality normal indication information and sends the power supply quality normal indication information to the control module when the low frequency, excessive frequency, low voltage and overvoltage phenomena are eliminated.
Preferably, in step 2, the reverse power monitoring module detects a current on a low-voltage side of the transformer, when the current is detected to be reversed, abnormal indication information of the current reversal is generated and sent to the control module, the control module forwards the information to the jurisdiction linkage module, and the jurisdiction linkage module reports the abnormal information to the authentication subsystem after receiving the abnormal indication, so that the authentication subsystem can broadcast the power grid corresponding to the group ID of the distributed power supply in time.
Preferably, in step 2, the control module receives the instruction sent from the reverse power monitoring module, the power quality monitoring module, and the jurisdiction linkage module to form a grid-connected switch control command, and the method for forming the switch control command includes:
generating a grid-connected disconnection instruction as long as any one of the reverse power monitoring module and the district linkage module sends an abnormal instruction, instructing the grid-connected switch module to disconnect the switch, and enabling the control module;
if the inverse power monitoring module and the district linkage module do not send abnormal instructions but the power quality monitoring module sends quality abnormal instructions, a grid-connected disconnection instruction is generated to instruct the grid-connected switch module to disconnect the switch, but the control module is not enabled;
and if the reverse power monitoring module and the district linkage module do not send abnormal instructions but the power quality monitoring module sends quality abnormal recovery instructions, generating a grid-connected connection instruction to instruct the grid-connected switch module to connect the switch.
Preferably, in step 2, after the control module is disabled, the control module can be re-enabled only when the jurisdiction linkage module sends an enabling instruction, where the enabling instruction is triggered after the jurisdiction module detects that the power grid related to a certain group ID sent by the authentication subsystem is recovered to be normal.
Compared with the prior art, the invention has the following advantages and beneficial effects: by adopting the method, the grid-connected switch control command is formed after the power grid detection results of the device and other devices in the jurisdiction are jointly considered, so that the accuracy of the anti-arc island protection is greatly improved, the safety of the distributed power supply merging into the power grid is effectively ensured, and the effective operation of the whole power grid system is ensured.
Drawings
FIG. 1 is a flow diagram of a method for anti-islanding protection of a low-voltage distributed power supply;
FIG. 2 is a schematic diagram of an anti-islanding protection device for a low voltage distributed power supply;
Detailed Description
In order to make the technical solution and the advantages of the present invention clearer, the following explains embodiments of the present invention in further detail.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A method for anti-islanding protection of a low-voltage distributed power supply, as shown in fig. 1, specifically includes the following steps:
step 1: the jurisdiction linkage module initiates a grid-connected request to a jurisdiction authentication subsystem, and enables the control module after obtaining a grid-connected allowable response;
step 2: the control module forms a grid-connected switch control command according to the instructions sent by the reverse power monitoring module, the power quality monitoring module and the district linkage module and sends the grid-connected switch control command to the grid-connected switch module;
and step 3: and the grid-connected switch module executes connection or disconnection of the grid-connected switch according to the control command of the grid-connected switch, so that the low-voltage distributed power supply is safely and reliably incorporated into the power grid system.
In the steps 1, 2 and 3, the anti-islanding protection device for the low-voltage distributed power supply comprises a district linkage module, a control module, a power quality monitoring module, a reverse power monitoring module, a grid-connected switch module, a second current mutual inductance module, a transformer, a first current mutual inductance module and the low-voltage distributed power supply.
The authentication subsystem is a subsystem of a power transmission and distribution scheduling system in the jurisdiction and is used for coordinating grid-connected information of each power transformation and distribution substation and the distributed power supply. The information exchange with each distributed power supply anti-islanding protection device is realized through a data communication network of a scheduling system. The main function of the system is to collect abnormal information of each substation and distributed power supply, and to broadcast the abnormal information to each protection system of the substation and protection device of the distributed power supply upon receiving the abnormal information.
In the step 1, the grid connection request at least includes the identity ID and the position information of the distributed power supply. The identity ID is a unique number of each distributed power supply of an authentication subsystem in a jurisdiction, and the position ID is used for determining the affiliation of a power grid grouping ID; the grid connection permission response information at least comprises permission indication and a group ID to which the identity ID of the distributed power supply belongs; the group ID is used for indicating that the power grid subsystems, into which different distributed power supplies belonging to the same group ID are incorporated, are the same subsystem, namely that the abnormal monitoring results of the different distributed power supplies belonging to the same group ID on the incorporated power grid subsystems are consistent and can be corrected mutually;
in the step 1, after obtaining a grid-connected allowable response, the jurisdiction linkage module reports an abnormal detection state of the distributed power supply about the incorporated power grid to an authentication subsystem according to a preset mode; the preset mode comprises periodic reporting or reporting based on an abnormal event (namely reporting the abnormal event to the authentication subsystem if the abnormal event occurs);
in the steps 1 and 2, after acquiring a grid-connected permission response, the jurisdiction linkage module periodically detects abnormal state information about each group ID broadcast by the authentication subsystem and sends the abnormal state information to the control module;
in the step 2, the power quality monitoring module detects current entering the grid-connected switch through a second current transformer, generates power supply quality abnormal indication information and sends the power supply quality abnormal indication information to the control module when low frequency, excessive frequency, low voltage and overvoltage occur, and generates power supply quality normal indication information and sends the power supply quality normal indication information to the control module when the low frequency, excessive frequency, low voltage and overvoltage phenomena are eliminated;
in the step 2, the reverse power monitoring module detects the current at the low-voltage side of the transformer by using the first current transformer module, when the current is detected to be reversed, abnormal indication information of the current reversal is generated and sent to the control module, the control module forwards the information to the jurisdiction linkage module, and the jurisdiction linkage module reports the abnormal information to the authentication subsystem after receiving the abnormal indication, so that the authentication subsystem can broadcast the abnormality of the power grid corresponding to the group ID of the distributed power supply in time, and other distributed power supplies in the group ID can correct the error by using the information (namely, the distributed power supplies do not detect the abnormality of the current reversal, but the other distributed power supplies in the same group ID detect the abnormality of the current reversal, the distributed power supplies also consider the current reversal, and further disconnect the grid-connected switch in time, the operation safety of maintenance personnel is ensured, so that the purpose of mutual correction of abnormal monitoring information among different distributed power supplies in the same group ID is realized, and the detection accuracy is improved);
in the step 2, the control module receives the instructions sent by the reverse power monitoring module, the power quality monitoring module and the jurisdiction linkage module to form a grid-connected switch control command, and the method for forming the switch control command comprises the following steps:
generating a grid-connected disconnection instruction to instruct a grid-connected switch module to disconnect a switch and disable a control module as long as any one of a reverse power monitoring module and a jurisdiction linkage module sends an abnormal instruction, wherein the control module can be re-enabled only when the jurisdiction linkage module sends an enabling instruction after the control module is disabled, and the enabling instruction is triggered after the jurisdiction module detects that a certain group ID power grid sent by an authentication subsystem is recovered to be normal;
if the inverse power monitoring module and the district linkage module do not send abnormal instructions but the power quality monitoring module sends quality abnormal instructions, a grid-connected disconnection instruction is generated to instruct the grid-connected switch module to disconnect the switch, but the control module is not enabled;
if the reverse power monitoring module and the district linkage module do not send abnormal instructions but the power quality monitoring module sends quality abnormal recovery instructions, a grid-connected connection instruction is generated to indicate the grid-connected switch module to connect a switch;
in the step 2, preferentially, after the grid-connected switch module is disconnected, if the control module needs to be enabled, the voltage transformation module and the distributed power supply module are preferentially closed, so that the service life of the distributed power supply equipment is prolonged.
The embodiment, which is described herein with reference to fig. 2 as an example, illustrates an anti-islanding protection device for a low-voltage distributed power supply according to the present invention.
As shown in fig. 2, an anti-islanding protection device for a low-voltage distributed power supply includes: the system comprises a district linkage module, a control module, a power quality monitoring module, a reverse power monitoring module, a grid-connected switch module, a second current mutual inductance module, a transformer, a first current mutual inductance module and a low-voltage distributed power module, wherein the functions of each part are as follows:
the district linkage module: the module is responsible for sending an authentication request to the authentication subsystem, analyzing the state information of each group broadcasted by the authentication subsystem and sending the state information to the control module, and is also responsible for enabling the control module;
a control module: the module is responsible for generating a grid-connected switch control instruction according to the instructions sent by the jurisdiction linkage module, the reverse power monitoring module and the power quality monitoring module and sending the grid-connected switch control instruction to the grid-connected switch module;
power quality monitoring module: the module is responsible for monitoring the quality of the distributed power supply and sending a monitoring result to the control module;
a reverse power monitoring module: the module is responsible for monitoring the current reversal condition of the distributed power supply and sending the monitoring result to the control module;
grid-connected switch module: the module is responsible for completing the control of the disconnection or connection of the switch according to the grid-connected control instruction;
the second current mutual inductance module: the module is responsible for sensing the current condition of the inlet of the grid-connected switch and feeding back information to the power quality monitoring module;
a transformer: completing the pressurization output of the low-voltage distributed power supply;
the first current mutual inductance module: the module is responsible for sensing the current condition of the low-voltage side of the voltage transformation module and feeding back information to the reverse power monitoring module;
low-voltage distributed power supply module: is responsible for local power generation.
The following describes a specific implementation of an anti-islanding protection device for a low-voltage distributed power supply by using a specific embodiment:
in embodiment 1, the reverse current detection results of other distributed power supplies under the same group ID are used to complete the reverse arc island control of the distributed power supply:
at the time of T0, a distributed power supply station 1 is started, at this time, a district linkage module of the station initiates authentication to an authentication subsystem, after the authentication is passed, the district linkage module enables a control module, then the control module opens a low-voltage distributed power supply and a transformer, after the power is on, an abnormal instruction sent by the district linkage module, a reverse power monitoring module and a power quality monitoring module is not received within a preset time, a switch of a grid-connected switch module is opened, the station 1 is connected to a power grid, at the time of T1, if the district linkage module receives the condition that a sub-group ID sent by the authentication subsystem is abnormal, the district linkage module sends the abnormal instruction to the control module, after the control module receives the abnormal instruction, the control module sends the instruction to the grid-connected switch module to disconnect a switch, simultaneously the low-voltage distributed power supply and the transformer are closed, and the control module is enabled, and at the moment of T2, the district linkage module detects that the ID power grid of the group broadcasted by the authentication subsystem is recovered to be normal, the control module is enabled, then the control module turns on the low-voltage distributed power supply and the transformer, and after the control module does not receive the indication of the abnormal instruction sent by the district linkage module, the reverse power monitoring module and the power quality monitoring module within the preset time after re-enabling, the switch of the grid-connected switch module is turned on, and the distributed power supply is continuously and normally merged into the power grid. Therefore, the real-time example can see that due to the fact that the function of mutual group deviation rectification is added, when the station is detected to be out of order, due to the fact that monitoring conclusion of other stations in the same group ID is borrowed, monitoring error deviation rectification is achieved timely, grid-connected switch disconnection is completed finally timely, the phenomenon of an arc island is avoided, damage to power grid maintenance personnel is avoided, the grid-connected switch can be automatically connected after the power grid is recovered to be normal, the distributed power supply is continuously connected into the power grid, and the distributed power supply serves the power grid.
Embodiment 2, the distributed power supply itself detects a reverse current to complete the arc island control:
at the time of T0, a distributed power supply station 1 is started, at this time, a district linkage module of the station initiates authentication to an authentication subsystem, after the authentication is passed, the district linkage module enables a control module, then the control module opens a low-voltage distributed power supply and a transformer, after the power is on, an abnormal instruction sent from the district linkage module, a reverse power monitoring module and a power quality monitoring module is not received within a preset time, a switch of a grid-connected switch module is opened, the station 1 is connected to a power grid, at the time of T1, if the reverse power monitoring module detects reverse current, the abnormal instruction is sent to the control module, after the control module receives the abnormal instruction, the control module sends an instruction to the grid-connected switch module to disconnect the switch, simultaneously the low-voltage distributed power supply and the transformer are closed, and the abnormal information is forwarded to the district linkage module (the district linkage module reports the information to the authentication subsystem, the authentication subsystem broadcasts the abnormal information to the group ID to which the distributed power supply belongs), the control module is enabled, at the time of T2, the district linkage module detects that the authentication subsystem broadcasts the group ID power grid to be recovered to normal, the control module is enabled, then the control module turns on the low-voltage distributed power supply and the transformer, and after the control module does not receive the abnormal instruction indication sent by the district linkage module, the reverse power monitoring module and the power quality monitoring module within the preset time after re-enabling, the switch of the grid-connected switch module is turned on, and the distributed power supply is continuously and normally incorporated into the power grid. Therefore, the real-time example can see that the system has a reverse current detection and feedback mechanism, so that on one hand, a grid-connected switch can be timely disconnected, the arc island phenomenon is avoided, and damage to power grid maintenance personnel is avoided, on the other hand, the abnormal information is fed back to the authentication subsystem, the authentication subsystem broadcasts information to all distributed power supplies in the whole group ID to realize abnormal deviation correction, and finally, the condition that other members in the group cannot perform reverse arc island operation due to self detection errors and damage to the power grid maintenance personnel is avoided.
Embodiment 3, utilize this distributed generator self to detect power quality anomaly and realize incorporating into control, avoid the influence of this site anomaly period to whole electric wire netting, guarantee electric wire netting operation safe and reliable:
at the time of T0, the distributed power supply station 1 is started, at this time, the jurisdiction linkage module of the station initiates authentication to the authentication subsystem, after the authentication is passed, the jurisdiction linkage module enables the control module, then the control module opens the low-voltage distributed power supply and the transformer, after the power is on, the abnormal instruction sent from the jurisdiction linkage module, the reverse power monitoring module and the power quality monitoring module is not received within the preset time, the switch of the grid-connected switch module is opened, the station 1 is connected to the power grid, at the time of T1, if the power quality monitoring module detects that the local power supply has quality problems, the abnormal instruction is sent to the control module, after the control module receives the abnormal instruction, the grid-connected switch module is disconnected with the switch (since the local abnormal condition only needs to be controlled not to be connected to the power grid during the abnormal time, therefore, the abnormal instruction does not need to be sent to the jurisdiction linkage module and fed back to the, and the control module is not required to be enabled), and in the period T2, when the power quality monitoring module detects that the local power quality is abnormally recovered, the abnormal recovery information is sent to the control module, and the control module sends a command to the grid-connected switch module connecting switch after receiving the abnormal recovery information, so that the problem that the abnormal period is merged into the power grid to influence the normal operation of the power grid is avoided.
According to the embodiment, the grid-connected switch control command is formed by jointly considering the power grid detection results of the device and other devices in the jurisdiction by adopting the method, so that the accuracy of arc island protection is greatly improved, the safety of the distributed power supply merging into the power grid is effectively ensured, and the effective operation of the whole power grid system is ensured.
In summary, the present invention is only a preferred embodiment, and is not intended to limit the scope of the present invention, and various changes and modifications can be made by workers in the light of the above description without departing from the technical spirit of the present invention. The technical scope of the present invention is not limited to the content of the specification, and all equivalent changes and modifications in the shape, structure, characteristics and spirit described in the scope of the claims of the present invention are included in the scope of the claims of the present invention.
Claims (8)
1. An anti-islanding protection method for a low-voltage distributed power supply is characterized by comprising the following steps:
is applied to a system consisting of an anti-islanding protection device of a low-voltage distributed power supply and a district certification subsystem,
the anti-islanding protection device of the low-voltage distributed power supply comprises a district linkage module, a control module, a power supply quality monitoring module, a reverse power monitoring module, a grid-connected switch module, a second current mutual inductance module, a transformer, a first current mutual inductance module and the low-voltage distributed power supply;
the method comprises the following steps:
step 1: the jurisdiction linkage module initiates a grid-connected request to a jurisdiction authentication subsystem, and enables the control module after obtaining a grid-connected allowable response;
step 2: the control module forms a grid-connected switch control command according to the instructions sent by the reverse power monitoring module, the power quality monitoring module and the district linkage module and sends the grid-connected switch control command to the grid-connected switch module; the method for forming the grid-connected switch control command comprises the following steps:
generating a grid-connected disconnection instruction as long as any one of the reverse power monitoring module and the district linkage module sends an abnormal instruction, instructing the grid-connected switch module to disconnect the switch, and enabling the control module;
if the inverse power monitoring module and the district linkage module do not send abnormal instructions but the power quality monitoring module sends quality abnormal instructions, a grid-connected disconnection instruction is generated to instruct the grid-connected switch module to disconnect the switch, but the control module is not enabled;
if the inverse power monitoring module and the district linkage module do not send abnormal instructions but the power quality monitoring module sends quality abnormal recovery instructions, a grid-connected connection instruction is generated to instruct the grid-connected switch module to connect the switch
And step 3: the grid-connected switch module controls the on-off of the grid-connected switch according to the grid-connected switch control command, so that the low-voltage distributed power supply can be safely and reliably incorporated into a power grid system.
2. The anti-islanding protection method for the low-voltage distributed power supply according to claim 1, wherein:
in the step 1, the step of processing the raw material,
the grid connection request at least comprises the identity ID and the position information of the distributed power supply;
the grid connection permission response information at least comprises permission indication and a group ID to which the identity ID of the distributed power supply belongs.
3. The anti-islanding protection method for the low-voltage distributed power supply according to claim 1, wherein:
in the step 1, the step of processing the raw material,
and after the district linkage module obtains the grid-connected allowable response, reporting the abnormal detection state of the distributed power supply about the incorporated power grid to the authentication subsystem according to a preset mode.
4. The anti-islanding protection method for the low-voltage distributed power supply according to claim 3, wherein:
the mode of reporting the abnormal detection state of the distributed power supply about the incorporated power grid to the authentication subsystem comprises periodic reporting and reporting based on abnormal events.
5. The anti-islanding protection method for the low-voltage distributed power supply according to claim 1, wherein:
in the steps 1 and 2, after obtaining the grid-connected permission response, the jurisdiction linkage module periodically detects the abnormal state information about each group ID broadcast by the authentication subsystem, and sends the abnormal state information to the control module.
6. The anti-islanding protection method for the low-voltage distributed power supply according to claim 1, wherein:
in the step 2, in the step of processing,
the power quality monitoring module detects the power supply quality of the electric energy entering the grid-connected switch,
when low frequency, over frequency, low voltage and overvoltage occur, power supply quality abnormal indication information is generated and sent to the control module,
when the phenomena of low frequency, over frequency, low voltage and overvoltage are eliminated, normal indication information of the power supply quality is generated and sent to the control module.
7. The anti-islanding protection method for the low-voltage distributed power supply according to claim 2, wherein:
in the step 2, in the step of processing,
the reverse power monitoring module detects the current of the low-voltage side of the transformer, when the current is detected to be reversed, abnormal indication information of the current reversal is generated and sent to the control module, the control module forwards the information to the district linkage module, and the district linkage module reports the abnormal information to the authentication subsystem after receiving the abnormal indication, so that the authentication subsystem can broadcast the abnormal condition of the power grid corresponding to the group ID of the distributed power supply in time.
8. The anti-islanding protection method for the low-voltage distributed power supply according to claim 1, wherein:
in the step 2, after the control module is disabled, the control module can be re-enabled only when the jurisdiction linkage module sends an enabling instruction, wherein the enabling instruction is triggered after the jurisdiction module detects that the power grid related to a certain group ID sent by the authentication subsystem is recovered to be normal.
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| CN118157086B (en) * | 2024-05-10 | 2024-07-23 | 浙江科自电力科技有限公司 | Microcomputer protection method, equipment and medium based on distributed grid-connected power generation reconstruction |
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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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