CN106300421A - The monitoring system of a kind of distributed power generation grid-connected system and isolated island guard method thereof - Google Patents
The monitoring system of a kind of distributed power generation grid-connected system and isolated island guard method thereof Download PDFInfo
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- CN106300421A CN106300421A CN201610793756.5A CN201610793756A CN106300421A CN 106300421 A CN106300421 A CN 106300421A CN 201610793756 A CN201610793756 A CN 201610793756A CN 106300421 A CN106300421 A CN 106300421A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
-
- 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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- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/121—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using the power network as support for the transmission
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The present invention relates to the monitoring system of a kind of distributed power generation grid-connected system, including: distributed power generation grid connection interface device, complete the monitoring of distributed generation system, load, be monitored uploading of information to power dispatching station, perform the guidance command of power dispatching station；Monitor terminal, for detecting distributed power source site, the voltage of load point, electric current, performance number and grid-connected on off state, receives the remote signalling amount of distributed power source net-connected controller；Power dispatching station, for realizing the running state monitoring of the power distribution network of access distributed power source, controlling work, and according to task scope, it is achieved the energy management operation of distributed power source.The invention also discloses the isolated island guard method of the monitoring system of a kind of distributed power generation grid-connected system.The present invention, without setting up communication network specially, reduces system cost；In the case of system increases distributed power source newly, monitoring system, without increasing new hardware investment, can meet the requirement of distributed power source flexible access.
Description
Technical field
The present invention relates to distributed power generation grid-connected system technical field based on carrier communication, a kind of distributed
The monitoring system of electricity grid-connected system and isolated island guard method thereof.
Background technology
Being affected by country's new forms of energy policy, photovoltaic is distributed power source the oozing in tradition electricity consumption side of representative in a distributed manner
Rate improves constantly thoroughly.Owing to distributed electrical source monomer installed capacity is less, installation site randomness is relatively big, therefore use installing specially
Being monitored distributed power source with optical fiber, economy and motility are poor.At present, existing employing cloud platform mode realizes
Scheme, the function for monitoring of distributed power source electric parameters can be completed.But realize the control to distributed power source by cloud platform
The requirement to real-time and safety in operation power control cannot be met.Distributed power source is equipped with isolated island protection, but works as district
In territory, distributed power source permeability improves constantly, and power supply is the isolated island protection of unit in a distributed manner, will be unable to give full play to distribution
Advantage on formula power supply capacity, reducing installation distributed power source is the economy that power distribution network brings, and cannot improve power distribution network confession
The reliability of electricity and safety.
Summary of the invention
The primary and foremost purpose of the present invention is to provide one to utilize existing alternating current circuit as communication transmission medium, it is achieved point
The monitoring of cloth electricity generation system, improves distributed power source and accesses the motility of power distribution network, reduces dividing of monitoring system construction cost
The monitoring system of cloth electricity generation grid-connecting system.
For achieving the above object, present invention employs techniques below scheme: the monitoring of a kind of distributed power generation grid-connected system
System, including:
Distributed power generation grid connection interface device, completes the monitoring of distributed generation system, load, supervises to power dispatching station
Uploading of control information, performs the guidance command of power dispatching station；
Monitor terminal, for detecting distributed power source site, the voltage of load point, electric current, performance number and grid-connected switch shape
State, receives the remote signalling amount of distributed power source net-connected controller, including isolated island event signal, operating state signal；
Power dispatching station, for realizing accessing the running state monitoring of the power distribution network of distributed power source, control work, and according to
Task scope, it is achieved the energy management operation of distributed power source.
Described distributed power generation grid connection interface device includes for detecting commonly connected point voltage, electric current and commonly connected
The data acquisition unit of some on off state, protection common point connecting valve deciliter controlled for realization and security control list
Unit, for metering and the electric energy metrical unit of quality testing and quality of power supply unit, for distributed generation system energy management
The energy management unit controlled with islet operation.
Described monitor terminal includes the DG monitor terminal for distributed power source and the load monitoring terminal for load, institute
State distributed power generation grid connection interface device and utilize carrier module, by power circuit and DG monitor terminal, power dispatching station phase
Even.
Described monitor terminal uses response calling or timing to upload mode, uploads to distributed power generation grid connection interface device
Supervision information；Described monitor terminal uses event triggered fashion, uploads event information to distributed power generation grid connection interface device；Institute
State monitor terminal to be interacted with distributed power source net-connected controller by serial communication mode, when distributed power source cutting-in control
When device occurs isolated island event, operation exception event, actively send event to monitor terminal.
Another object of the present invention is to provide the isolated island protection side of the monitoring system of a kind of distributed power generation grid-connected system
Method, the method includes the step of following order:
(1) event information during DG monitor terminal receives distributed power source net-connected controller, when distributed power source net-connected controller
When detecting isolated island event, DG monitor terminal sends isolated island event information, event information to distributed power generation grid connection interface device
Including No. ID of distributed power source, isolated island goes out now and grid-connected point voltage, current value, and starts its first internal timing
Device；
(2), after distributed power generation grid connection interface device receives the isolated island event information of monitor terminal, logic is differentiated according to isolated island
Carry out distributed generation system isolated island differentiation；If differentiating that result is distributed generation system isolated island, then carry out points of common connection
Switch trip operates, and completes order to DG monitor terminal transmission island disposal；Whereas if differentiate that result is distributed power generation
System isolated island is judged by accident, then send isolated island erroneous judgement order to monitor terminal；
(3) monitor terminal receives distributed power generation grid connection interface device order in the timing of first timer, if
Being that island disposal completes order, monitor terminal then sends out isolated island involution order, the same recurrence of disease at the same time next year of monitor terminal to distributed power controller
Position first timer；If the erroneous judgement order of distributed generation system isolated island, monitor terminal is then sent out to distributed power controller
The erroneous judgement order of distributed generation system isolated island, monitor terminal resets first timer simultaneously；First timer then after, if
Do not receive the associated responses order about isolated island event of distributed grid-connected interface arrangement, the most directly carry out distributed power source grid-connected
The sub-switching operation of some switch；The timing value of described first timer, by the traffic rate, distributed selected in monitoring system
The isolated island of electricity generation grid-connecting interface arrangement decision logic and different distributions formula power-supply controller of electric differentiates that the time difference together decides on.
The isolated island of described distributed power generation grid connection interface device differentiates that logic is: when distributed power generation grid connection interface device connects
After receiving the isolated island signal of any one DG monitor terminal, directly it is judged as distributed generation system isolated island.
The isolated island of described distributed power generation grid connection interface device differentiates that logic is: when distributed power generation grid connection interface device connects
After receiving the isolated island signal of any one DG monitor terminal, set its internal second timer, when the timing of second timer
In, if receiving the isolated island event signal that n DG monitor terminal is uploaded again, then it is judged as distributed generation system isolated island；As
Fruit, in the timing of second timer, does not receives the isolated island event signal that n DG monitoring unit is uploaded, is then judged as distribution
Formula electricity generation system isolated island is judged by accident；The value of n is set according to distributed generator islanding Detection accuracy statistical result；Second timing
The timing of device is differentiated the time difference by the isolated island of different distributions formula power-supply controller of electric, and monitor terminal is grid-connected with distributed power generation
Interface arrangement communication delay together decides on.
Under this isolated island differentiates logic, isolated island guard method is: first, and by protection and security control unit, tripping is public
Junction point switch altogether；Secondly, by broadcast mode, the DG monitor terminal in distributed generation system issues island disposal and completes
Order；Again, by energy management unit, carry out the energy balance of distributed generation system under island operation state；
After the island disposal that described DG monitor terminal receives distributed power generation grid connection interface device completes order, to distributed power source
Net-connected controller transmission island disposal completes order, and the first timer that resets, and distributed power source net-connected controller proceeds to isolated island
Control model, and no longer detection isolated island event；
DG monitor terminal in the timing of first timer, if do not receive distributed grid-connected interface arrangement with isolated island phase
The order closed, will be timed to after date at first timer, will send power supply halt command to distributed power source net-connected controller, and
Tripping site switch.
Under this isolated island differentiates logic, isolated island guard method is: in the case of second timer is not timed out, distributed power generation
Grid-connecting apparatus judges distributed generation system isolated island, and first, by protection and security control unit, tripping points of common connection is opened
Close；Secondly, by broadcast mode, the DG monitor terminal in distributed generation system issues island disposal and completes order；Again,
By energy management unit, carry out the energy balance of distributed generation system under island operation state；
DG monitor terminal receives after the island disposal of distributed power generation grid connection interface device completes order, grid-connected to distributed power source
Controller transmission island disposal completes order, and the first timer that resets, and distributed power source net-connected controller proceeds to isolated island control
Pattern, and no longer detection isolated island event；
DG monitor terminal in the timing of first timer, if do not receive distributed grid-connected interface arrangement with isolated island phase
The order closed, will be timed to after date at first timer, will send power supply halt command to distributed power source net-connected controller, and
Tripping site switch；
Second timer then in the case of, distributed power generation grid-connecting apparatus does not judges distributed generation system isolated island, by extensively
Broadcast mode, the DG monitor terminal in distributed generation system issues isolated island erroneous judgement order；
DG monitor terminal receives the isolated island erroneous judgement order of distributed power generation grid connection interface device, to distributed power source net-connected controller
Transmission isolated island erroneous judgement order, and the first timer that resets, distributed power source net-connected controller involution isolated island testing process；
DG monitor terminal is in first timer timing, if not receiving the relevant to isolated island of distributed grid-connected interface arrangement
Order, after date will be timed at first timer, power supply halt command will be sent to distributed power source net-connected controller, and and jump
Open and site switch.
As shown from the above technical solution, the present invention uses carrier communication to build the communication structure of monitoring system, it is not necessary to special
Set up communication network, reduce system cost；Simultaneously in the case of system increases distributed power source newly, monitoring system is without increasing
New hardware investment, can meet the requirement of distributed power source flexible access.The present invention can improve only be equipped with passive isolated island inspection
There is the problem in detection dead band in the isolated island detection of survey method, in the case of can lowering distributed power source paired running again, single simultaneously
The probability of distributed generator islanding error detection, and for distributed generation system energy management control provide the foundation.
Accompanying drawing explanation
Fig. 1 is assembly of the invention structural representation.
Detailed description of the invention
As it is shown in figure 1, the monitoring system of a kind of distributed power generation grid-connected system, including: distributed power generation network interface dress
Put, complete the monitoring of distributed generation system, load, be monitored uploading of information to power dispatching station, perform electric power and adjust
The guidance command of degree mechanism；Monitor terminal, for detect distributed power source site, the voltage of load point, electric current, performance number with
And grid-connected on off state, receive the remote signalling amount of distributed power source net-connected controller, including isolated island event signal, running status letter
Number；Power dispatching station, for realizing accessing the running state monitoring of the power distribution network of distributed power source, control work, and according to
Task scope, it is achieved the energy management operation of distributed power source.
As it is shown in figure 1, described distributed power generation grid connection interface device include for detect commonly connected point voltage, electric current with
And the data acquisition unit of points of common connection on off state, protection common point connecting valve deciliter controlled for realization and peace
Full control unit, for metering and the electric energy metrical unit of quality testing and quality of power supply unit, for distributed generation system
The energy management unit that energy management and islet operation control.Described monitor terminal includes monitoring eventually for the DG of distributed power source
End and the load monitoring terminal for load, described distributed power generation grid connection interface device utilizes carrier module, passes through electric lines of force
Road is connected with DG monitor terminal, power dispatching station.Described monitor terminal uses response calling or timing to upload mode, to
Distributed power generation grid connection interface device uploads supervision information；Described monitor terminal uses event triggered fashion, to distributed power generation
Grid connection interface device uploads event information；Described monitor terminal is entered with distributed power source net-connected controller by serial communication mode
Row is mutual, when occurring isolated island event, operation exception event in distributed power source net-connected controller, actively sends event to prison
Control terminal.
This method includes the step of following order:
(1) event information during DG monitor terminal receives distributed power source net-connected controller, when distributed power source net-connected controller
When detecting isolated island event, DG monitor terminal sends isolated island event information, event information to distributed power generation grid connection interface device
Including No. ID of distributed power source, isolated island goes out now and grid-connected point voltage, current value, and starts its first internal timing
Device；
(2), after distributed power generation grid connection interface device receives the isolated island event information of monitor terminal, logic is differentiated according to isolated island
Carry out distributed generation system isolated island differentiation；If differentiating that result is distributed generation system isolated island, then carry out points of common connection
Switch trip operates, and completes order to DG monitor terminal transmission island disposal；Whereas if differentiate that result is distributed power generation
System isolated island is judged by accident, then send isolated island erroneous judgement order to monitor terminal；
(3) monitor terminal receives distributed power generation grid connection interface device order in the timing of first timer, if
Being that island disposal completes order, monitor terminal then sends out isolated island involution order, the same recurrence of disease at the same time next year of monitor terminal to distributed power controller
Position first timer；If the erroneous judgement order of distributed generation system isolated island, monitor terminal is then sent out to distributed power controller
The erroneous judgement order of distributed generation system isolated island, monitor terminal resets first timer simultaneously；First timer then after, if
Do not receive the associated responses order about isolated island event of distributed grid-connected interface arrangement, the most directly carry out distributed power source grid-connected
The sub-switching operation of some switch；The timing value of described first timer, by the traffic rate, distributed selected in monitoring system
The isolated island of electricity generation grid-connecting interface arrangement decision logic and different distributions formula power-supply controller of electric differentiates that the time difference together decides on.
The isolated island of described distributed power generation grid connection interface device differentiates that logic is: when distributed power generation grid connection interface device connects
After receiving the isolated island signal of any one DG monitor terminal, directly it is judged as distributed generation system isolated island.
Under this isolated island differentiates logic, isolated island guard method is: first, and by protection and security control unit, tripping is public
Junction point switch altogether；Secondly, by broadcast mode, the DG monitor terminal in distributed generation system issues island disposal and completes
Order；Again, by energy management unit, carry out the energy balance of distributed generation system under island operation state；
After the island disposal that described DG monitor terminal receives distributed power generation grid connection interface device completes order, to distributed power source
DG net-connected controller transmission island disposal in net-connected controller, i.e. Fig. 1 completes order, and the first timer that resets, distributed
Power grid controller proceeds to isolated island control model, and no longer detection isolated island event；
DG monitor terminal in the timing of first timer, if do not receive distributed grid-connected interface arrangement with isolated island phase
The order closed, will be timed to after date at first timer, will send power supply halt command to distributed power source net-connected controller, and
Tripping site switch.
Another kind of situation, the isolated island of described distributed power generation grid connection interface device differentiates that logic is: when distributed power generation also
After network interface device receives the isolated island signal of any one DG monitor terminal, set its internal second timer, fixed second
Time device timing in, if receiving the isolated island event signal that n DG monitor terminal is uploaded again, be then judged as distributed power generation
System isolated island；If in the timing of second timer, do not receive the isolated island event signal that n DG monitoring unit is uploaded,
Then it is judged as that distributed generation system isolated island is judged by accident；The value of n is carried out according to distributed generator islanding Detection accuracy statistical result
Set；The timing of second timer by different distributions formula power-supply controller of electric isolated island differentiate the time difference, and monitor terminal with
Distributed power generation grid connection interface device communication delay together decides on.
Under this isolated island differentiates logic, isolated island guard method is: in the case of second timer is not timed out, distributed power generation
Grid-connecting apparatus judges distributed generation system isolated island, and first, by protection and security control unit, tripping points of common connection is opened
Close；Secondly, by broadcast mode, the DG monitor terminal in distributed generation system issues island disposal and completes order；Again,
By energy management unit, carry out the energy balance of distributed generation system under island operation state；
DG monitor terminal receives after the island disposal of distributed power generation grid connection interface device completes order, grid-connected to distributed power source
Controller transmission island disposal completes order, and the first timer that resets, and distributed power source net-connected controller proceeds to isolated island control
Pattern, and no longer detection isolated island event；
DG monitor terminal in the timing of first timer, if do not receive distributed grid-connected interface arrangement with isolated island phase
The order closed, will be timed to after date at first timer, will send power supply halt command to distributed power source net-connected controller, and
Tripping site switch；
Second timer then in the case of, distributed power generation grid-connecting apparatus does not judges distributed generation system isolated island, by extensively
Broadcast mode, the DG monitor terminal in distributed generation system issues isolated island erroneous judgement order；
DG monitor terminal receives the isolated island erroneous judgement order of distributed power generation grid connection interface device, to distributed power source net-connected controller
Transmission isolated island erroneous judgement order, and the first timer that resets, distributed power source net-connected controller involution isolated island testing process；
DG monitor terminal is in first timer timing, if not receiving the relevant to isolated island of distributed grid-connected interface arrangement
Order, after date will be timed at first timer, power supply halt command will be sent to distributed power source net-connected controller, and and jump
Open and site switch.
Visible, during isolated island guard method based on distributed power generation grid-connected system monitoring system realizes, first, respectively
The detection to system isolated island event of the distributed power source net-connected controller complete independently of DG monitor terminal；Secondly, orphan is being detected
After island event occurs, distributed power source net-connected controller passes through serial communication mode, and it is right with it to be passed to by isolated island event information
The DG monitor terminal answered；Again, DG monitor terminal is after receiving isolated island event information, by the carrier module in terminal, and should
Information passes to distributed power generation grid connection interface device, and starts first timer.
In sum, the present invention uses carrier communication to build the communication structure of monitoring system, it is not necessary to set up communication network specially
Network, reduces system cost；Simultaneously in the case of system increases distributed power source newly, monitoring system is thrown without increasing new hardware
Money, can meet the requirement of distributed power source flexible access.The present invention can improve the orphan being only equipped with passive island detection method
There is the problem in detection dead band in island detection, in the case of distributed power source paired running can being lowered again simultaneously, and single distributed power source
The probability of isolated island error detection, and for distributed generation system energy management control provide the foundation.
Claims (9)
1. the monitoring system of a distributed power generation grid-connected system, it is characterised in that: including:
Distributed power generation grid connection interface device, completes the monitoring of distributed generation system, load, supervises to power dispatching station
Uploading of control information, performs the guidance command of power dispatching station；
Monitor terminal, for detecting distributed power source site, the voltage of load point, electric current, performance number and grid-connected switch shape
State, receives the remote signalling amount of distributed power source net-connected controller, including isolated island event signal, operating state signal；
Power dispatching station, for realizing accessing the running state monitoring of the power distribution network of distributed power source, control work, and according to
Task scope, it is achieved the energy management operation of distributed power source.
The monitoring system of distributed power generation grid-connected system the most according to claim 1, it is characterised in that: described distributed
Electricity grid connection interface device includes for detecting commonly connected point voltage, electric current and the data acquisition of points of common connection on off state
Unit, for realize to common point connecting valve deciliter control protection and security control unit, for metering and quality testing
Electric energy metrical unit and quality of power supply unit, the energy pipe that controls for distributed generation system energy management and islet operation
Reason unit.
The monitoring system of distributed power generation grid-connected system the most according to claim 1, it is characterised in that: described monitor terminal
Including the DG monitor terminal for distributed power source and the load monitoring terminal for load, described distributed power generation network interface
Device utilizes carrier module, is connected with DG monitor terminal, power dispatching station by power circuit.
The monitoring system of distributed power generation grid-connected system the most according to claim 1, it is characterised in that: described monitor terminal
Use response calling or timing to upload mode, upload supervision information to distributed power generation grid connection interface device；Described monitoring is eventually
End uses event triggered fashion, uploads event information to distributed power generation grid connection interface device；Described monitor terminal passes through serial ports
Communication mode interacts with distributed power source net-connected controller, when distributed power source net-connected controller occurs isolated island event,
During operation exception event, actively send event to monitor terminal.
5. the isolated island protection of the monitoring system of the distributed power generation grid-connected system as according to any one of Claims 1-4
Method, the method includes the step of following order:
(1) event information during DG monitor terminal receives distributed power source net-connected controller, when distributed power source net-connected controller
When detecting isolated island event, DG monitor terminal sends isolated island event information, event information to distributed power generation grid connection interface device
Including No. ID of distributed power source, isolated island goes out now and grid-connected point voltage, current value, and starts its first internal timing
Device；
(2), after distributed power generation grid connection interface device receives the isolated island event information of monitor terminal, logic is differentiated according to isolated island
Carry out distributed generation system isolated island differentiation；If differentiating that result is distributed generation system isolated island, then carry out points of common connection
Switch trip operates, and completes order to DG monitor terminal transmission island disposal；Whereas if differentiate that result is distributed power generation
System isolated island is judged by accident, then send isolated island erroneous judgement order to monitor terminal；
(3) monitor terminal receives distributed power generation grid connection interface device order in the timing of first timer, if
Being that island disposal completes order, monitor terminal then sends out isolated island involution order, the same recurrence of disease at the same time next year of monitor terminal to distributed power controller
Position first timer；If the erroneous judgement order of distributed generation system isolated island, monitor terminal is then sent out to distributed power controller
The erroneous judgement order of distributed generation system isolated island, monitor terminal resets first timer simultaneously；First timer then after, if
Do not receive the associated responses order about isolated island event of distributed grid-connected interface arrangement, the most directly carry out distributed power source grid-connected
The sub-switching operation of some switch；The timing value of described first timer, by the traffic rate, distributed selected in monitoring system
The isolated island of electricity generation grid-connecting interface arrangement decision logic and different distributions formula power-supply controller of electric differentiates that the time difference together decides on.
Isolated island guard method the most according to claim 5, it is characterised in that: described distributed power generation grid connection interface device
Isolated island differentiates that logic is: after distributed power generation grid connection interface device receives the isolated island signal of any one DG monitor terminal, directly
Connect and be judged as distributed generation system isolated island.
Isolated island guard method the most according to claim 5, it is characterised in that: described distributed power generation grid connection interface device
Isolated island differentiates that logic is: after distributed power generation grid connection interface device receives the isolated island signal of any one DG monitor terminal, if
Its internal second timer fixed, in the timing of second timer, if receiving the orphan that n DG monitor terminal is uploaded again
Island event signal, then be judged as distributed generation system isolated island；If in the timing of second timer, do not receive n
The isolated island event signal that DG monitoring unit is uploaded, then be judged as that distributed generation system isolated island is judged by accident；The value of n is according to distributed electrical
Source isolated island Detection accuracy statistical result is set；The timing of second timer is by different distributions formula power-supply controller of electric
Isolated island differentiates the time difference, and monitor terminal together decides on distributed power generation grid connection interface device communication delay.
Isolated island guard method the most according to claim 6, it is characterised in that: under this isolated island differentiates logic, isolated island is protected
Method is: first, and by protection and security control unit, tripping points of common connection switchs；Secondly, by broadcast mode, to dividing
DG monitor terminal in cloth electricity generation system issues island disposal and completes order；Again, by energy management unit, carry out isolated island
The energy balance of distributed generation system under running status；
After the island disposal that described DG monitor terminal receives distributed power generation grid connection interface device completes order, to distributed power source
Net-connected controller transmission island disposal completes order, and the first timer that resets, and distributed power source net-connected controller proceeds to isolated island
Control model, and no longer detection isolated island event；
DG monitor terminal in the timing of first timer, if do not receive distributed grid-connected interface arrangement with isolated island phase
The order closed, will be timed to after date at first timer, will send power supply halt command to distributed power source net-connected controller, and
Tripping site switch.
Isolated island guard method the most according to claim 7, it is characterised in that: under this isolated island differentiates logic, isolated island is protected
Method is: in the case of second timer is not timed out, and distributed power generation grid-connecting apparatus judges distributed generation system isolated island, first
First, by protection and security control unit, tripping points of common connection switchs；Secondly, by broadcast mode, to distributed power generation system
DG monitor terminal in system issues island disposal and completes order；Again, by energy management unit, carry out under island operation state
The energy balance of distributed generation system；
DG monitor terminal receives after the island disposal of distributed power generation grid connection interface device completes order, grid-connected to distributed power source
Controller transmission island disposal completes order, and the first timer that resets, and distributed power source net-connected controller proceeds to isolated island control
Pattern, and no longer detection isolated island event；
DG monitor terminal in the timing of first timer, if do not receive distributed grid-connected interface arrangement with isolated island phase
The order closed, will be timed to after date at first timer, will send power supply halt command to distributed power source net-connected controller, and
Tripping site switch；
Second timer then in the case of, distributed power generation grid-connecting apparatus does not judges distributed generation system isolated island, by extensively
Broadcast mode, the DG monitor terminal in distributed generation system issues isolated island erroneous judgement order；
DG monitor terminal receives the isolated island erroneous judgement order of distributed power generation grid connection interface device, to distributed power source net-connected controller
Transmission isolated island erroneous judgement order, and the first timer that resets, distributed power source net-connected controller involution isolated island testing process；
DG monitor terminal is in first timer timing, if not receiving the relevant to isolated island of distributed grid-connected interface arrangement
Order, after date will be timed at first timer, power supply halt command will be sent to distributed power source net-connected controller, and and jump
Open and site switch.
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