CN104953610B - For grid side anti-islanding system and its control method that distributed photovoltaic generates electricity by way of merging two or more grid systems - Google Patents
For grid side anti-islanding system and its control method that distributed photovoltaic generates electricity by way of merging two or more grid systems Download PDFInfo
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- CN104953610B CN104953610B CN201410115486.3A CN201410115486A CN104953610B CN 104953610 B CN104953610 B CN 104953610B CN 201410115486 A CN201410115486 A CN 201410115486A CN 104953610 B CN104953610 B CN 104953610B
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- separating brake
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
- 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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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention provides a kind of grid side anti-islanding system generated electricity by way of merging two or more grid systems for distributed photovoltaic,Including grid-connected switch cubicle,The secondary circuit of the grid-connected switch cubicle includes closing coil HJ,Switching winding FJ,Remote control closing contact K1,Remote control separating brake contact K2,Closing by hand button AH,Manual brake separating button AF,Closing locking contact BS,First normally opened contact HJ1,Second normally opened contact HJ2,3rd normally opened contact FJ1,First normally-closed contact FJ2 and the second normally-closed contact HJ3,This grid side anti-islanding system and its control method generated electricity by way of merging two or more grid systems for distributed photovoltaic,After power distribution network power failure,Grid-connected switch should be pulled open in principle,Grid side staff can in time pass through client remote locking shutting-brake control loop,The connection for preventing grid-connected switch from closing a floodgate between cut-out photovoltaic power station and power distribution network again,Ensure not have during electric current falls to deliver to dead line,Ensure that the life security of maintainer,Power failure equipments do not result in damage yet.
Description
Technical field
The present invention relates to distributed power source access technology field, more particularly to a kind of generated electricity by way of merging two or more grid systems for distributed photovoltaic
Grid side anti-islanding system and its control method.
Background technology
Distributed photovoltaic power generation is refered in particular to use photovoltaic module, and solar energy is converted directly into the distributed power generation system of electric energy
System.It is a kind of new, tool generating with broad prospects for development and comprehensive utilization of energy mode, and it advocates and generates electricity nearby, just
It is near grid-connected, to change nearby, the principle for using nearby can not only effectively improve the generated energy of same size photovoltaic plant, while
Also efficiently solve the problems, such as loss of the electric power in boosting and long-distance transport.
Distributed photovoltaic power generation needs to be then sent through on power network DC power conversion into alternating current by inverter.Due to photovoltaic
Grid-connected system directly will feed back to power network after solar energy inversion, so various perfect safeguard measures are needed, except logical
The protection of normal electric current, voltage and frequency monitoring is outer, in addition it is also necessary to consider island effect.So-called isolated island refers to when power network because of accident or stops
During electric maintenance, user side distributed generation system itself will not cut off grid-connected power network, and form distribution and generate electricity and surrounding
A system for self-energizing of composition is loaded, isolated island must stop powering to the load after power distribution network power failure, otherwise distributed
The voltage and frequency of power network uncontrollable system when photovoltaic generating system is in island operation state, it is not only possible to can be to user
Equipment causes to damage, and to the staff of line maintenance contact may be brought dangerous, reduces the security of power network, it is seen then that
Must take effective measures to prevent the generation of island effect.
The content of the invention
The technical problem to be solved in the present invention is：In order to prevent the generation of island effect, it is to avoid because island effect is to user
Equipment is caused to damage, and brings contact dangerous to the staff of line maintenance, and distributed photovoltaic is used for the invention provides one kind
The grid side anti-islanding system and its control method generated electricity by way of merging two or more grid systems can in time cut off photovoltaic power station after power distribution network power failure
Connection between power distribution network, and closing locking control is carried out, restarting distributed photovoltaic power generation station needs distribution net side straight
Connect unblock or be issued to user side and combined floodgate latch contact is unlocked to solve the above problems.
The technical solution adopted for the present invention to solve the technical problems is：A kind of electricity generated electricity by way of merging two or more grid systems for distributed photovoltaic
Net side anti-islanding system, including grid-connected switch cubicle, the secondary circuit of the grid-connected switch cubicle include closing coil HJ, switching winding
FJ, remote control closing contact K1, remote control separating brake contact K2, closing by hand button AH, manual brake separating button AF, closing locking contact
BS, the first normally opened contact HJ1, the second normally opened contact HJ2, the 3rd normally opened contact FJ1, the first normally-closed contact FJ2 and second are normally closed
Contact HJ3, the closing coil HJ controls the first normally opened contact HJ1, the second normally opened contact HJ2 and the second normally-closed contact
HJ3, the switching winding FJ control the 3rd normally opened contact FJ1 and the first normally-closed contact FJ2, closing locking contact BS to be touched for normally closed
Point,
The first normally opened contact HJ1 connected with the first normally-closed contact FJ2 after respectively with remote control closing contact K1 and manually
Switch knob AH is in parallel, and termination the first power end KM+, the closing locking contact BS and the 3rd normally opened contact FJ1 strings
It is connected in parallel on the two ends of the second normally opened contact HJ2 after connection, and one end and the first normally-closed contact FJ2, closing by hand button AH and distant
The other end connection of control closing contact K1, the coil two ends of the closing coil HJ respectively with the second normally opened contact HJ2
Other end and second source end KM- with the 3rd normally opened contact FJ1 are connected, so as to form shutting-brake control loop；
One end after the second normally-closed contact HJ3 is in parallel with the remote control separating brake contact K2 and manual brake separating button AF respectively
The first power end KM+ is met, other end is connected with coil one end of the switching winding FJ, and the coil of the switching winding FJ is another
One termination second source end KM-, so as to form separating brake control loop.
In order to be able to allow user's more directly perceived grasp more in time to close a floodgate or gate-dividing state, also including combined floodgate warning light HD, separating brake
Warning light LD, the 4th normally opened contact HJ4 and the 5th normally opened contact FJ3, the closing coil HJ control the 4th normally opened contact
HJ4, the switching winding FJ controls the 5th normally opened contact FJ3, the first power end KM+, combined floodgate warning light HD, the 4th
Normally opened contact HJ4 and second source end KM- are sequentially connected in series to form combined floodgate prompting loop, the first power end KM+, separating brake prompting
Lamp LD, the 5th normally opened contact FJ3 and second source end KM- are sequentially connected in series to form separating brake prompting loop.
Also include control cabinet, the microprocessor of built-in system program is provided with the control cabinet, to combined floodgate latch contact
The closed procedure of BS is encrypted, and control closing locking contact BS loses when obtaining operation password and combined floodgate unlock instruction at the same time
Electricity closure, the closure control of such closing locking contact BS rests in distribution net side completely, and the unblock of user is intended to receive
Limitation, further ensure that photo-voltaic power generation station, all the time in gate-dividing state, has prevented because of user side when power distribution network has a power failure
Maloperation or erroneous judgement and carry out feed motion, cause electric current to fall to deliver to maintenance circuit, the serious life security for threatening maintainer
Situation, operate password form have many kinds, such as random cipher, using random cipher increase reliability while improve
The flexibility of control closing locking contact BS, as long as will when the staff of distribution net side cannot carry out closing a floodgate unblock operation
The random cipher of grasp informs user, and authorized user carries out unblock operation of closing a floodgate, and the microprocessor is returned with the shutting-brake control
Road, separating brake control loop and separating brake prompting loop connection, the microprocessor have
Combined floodgate input, connects the remote control closing contact K1, and microprocessor receives reclosing command, controls the remote control to close
Lock contact K1 is closed；
Separating brake input, connects the remote control separating brake contact K2, and microprocessor receives separating brake instruction, controls the remote control point
Lock contact K2 is closed；
Closing locking input, connects the closing locking contact BS, and microprocessor receives closing locking instruction or closes a floodgate
Unlock instruction, control closing locking contact BS is opened or closed.
User is to shutting-brake control loop, separating brake control loop, separating brake prompting loop and closing locking contact BS for convenience
Real-time status grasp and they are operated, the microprocessor is also associated with
Display module, display shutting-brake control loop, separating brake control loop, separating brake prompting loop and closing locking contact BS's
Real-time status, the operation interface of display combined floodgate, separating brake and closing locking, when closing operation is carried out, display operation password entry
Interface；
Key circuit, in shutting-brake control loop, separating brake control loop, separating brake prompting loop, closing locking contact BS
Real-time status display interface, operation is switched between combined floodgate, separating brake and the operation interface of closing locking, and will close a floodgate,
Separating brake, close a floodgate unblock and closing locking instruction be typed into microprocessor, carry out close a floodgate unblock operation when, for microprocessor
Device input operation password.
The display module includes touch liquid crystal screen and the first drive circuit, and the key circuit includes that button and second drives
Dynamic circuit, the button is the set of local touch point on the touch liquid crystal screen, and second drive circuit is integrated in first
Drive circuit, display module and key circuit are integrated in one, and the carrying out for not only showing and keying in more facilitates and coordinate, and
And the volume of whole device is reduced, it is easily installed and implements.
Also include server and the client networked with the server, the server remotely leads to the microprocessor
News, the built-in control software of client, for being instructed combined floodgate, separating brake, unblock of closing a floodgate, closing locking by access server
With operation password remote transmission is in the microprocessor and obtains "on" position, gate-dividing state and closing locking state and shows
Show.
Specifically, the microprocessor be also associated with for power not between have a power failure source.
The microprocessor is also associated with USB communication module, for the typing in the microprocessor or more new system
Program, according to specific service condition, timely redjustment and modification system program improves the performance and stability of device.
The microprocessor is also associated with GPRS communication module, and combined floodgate, separating brake, unblock of closing a floodgate, combined floodgate are obtained for long-range
Blocking order and operation password, and "on" position, gate-dividing state and closing locking state are sent, the GPSR wide network coverages,
Related corollary equipment technology maturation, utilization rate is high, and data transfer reliability is also allowed for implementing and set, do not limit to certainly yet with
GPRS network, as long as the purpose of remote transmission can be reached, is used equally to this, such as commonly used in WIFi wireless networks or industry
WIA wireless networks.
A kind of control method of the grid side anti-islanding system generated electricity by way of merging two or more grid systems for distributed photovoltaic, comprises the following steps：
A, when user side carries out sub-switching operation by the manual brake separating button：
A, press and unclamp after the manual brake separating button, the coil of the switching winding FJ is obtained and electric carries out separating brake action, institute
The first normally-closed contact FJ2 disconnections are stated, so that shutting-brake control loop disconnects, the coil losing electricity of the closing coil HJ, described the
One normally opened contact HJ1, the second normally opened contact HJ2 disconnect, shutting-brake control loop power-off, the second normally-closed contact HJ3 closures,
The coil of the switching winding FJ persistently it is electric, the 4th normally opened contact HJ4 disconnects, and the combined floodgate warning light HD extinguishes, the
Five normally opened contact FJ3 are closed, and the separating brake warning light LD is lighted；
B, the microprocessor show gate-dividing state and closing locking state in real time on display module, if the conjunction
Lock latch contact BS is still within closure state, then being input into closing locking by key circuit instructs, and microprocessor is connected to combined floodgate
Closing locking contact BS is controlled to obtain electrically disconnected after blocking order, key circuit cannot be input into closing locking and refer to during success closing locking
Order；
Gate-dividing state and closing locking status remote are transferred to service by c, the microprocessor by GPRS communication module
Device, the client access server obtains gate-dividing state and closing locking state, if the closing locking contact BS is still
Closure state is so in, closing locking instruction is transferred to microprocessor, the microprocessor by client by Server remote
Control closing locking contact BS obtains electrically disconnected, and client cannot be input into closing locking instruction during success closing locking；
B, when user side carries out sub-switching operation by key circuit：
D, in "on" position when, it is impossible to by key circuit key in reclosing command, closing locking instruct and closed a floodgate
Unblock operation, according to separating brake and the operation interface of closing locking, keys in separating brake and instructs by key circuit to microprocessor, described
Disconnected after the microprocessor control of short duration closures of the remote control separating brake contact K2, key circuit is input into closing locking again after success separating brake
Instruction, microprocessor control closing locking contact BS obtains electrically disconnected, and key circuit cannot again be input into conjunction after success closing locking
Lock blocking order, the coil of the switching winding FJ obtain it is electric carry out separating brake action, the first normally-closed contact FJ2 disconnects so that
Disconnect shutting-brake control loop, the coil losing electricity of the closing coil HJ, the first normally opened contact HJ1, the second normally opened contact
HJ2 is disconnected, shutting-brake control loop power-off, and the second normally-closed contact HJ3 closures, the coil of the switching winding FJ is persistently obtained
Electricity, the 4th normally opened contact HJ4 disconnects, and the combined floodgate warning light HD extinguishes, the 5th normally opened contact FJ3 closures, the separating brake
Warning light LD is lighted；
Gate-dividing state and closing locking status remote are transferred to service by e, the microprocessor by GPRS communication module
Device, the client access server obtains gate-dividing state and closing locking state, if the closing locking contact BS is still
Closure state is so in, closing locking instruction is transferred to microprocessor, the microprocessor by client by Server remote
Control closing locking contact BS obtains electrically disconnected, and client cannot be input into closing locking instruction during success closing locking；
C, when carrying out long-range sub-switching operation：
F, in "on" position when, client cannot be input into reclosing command, closing locking instruction and combined floodgate unlock instruction, visitor
Separating brake is instructed and is transferred to microprocessor by Server remote by family end, and the microprocessor is received simultaneously by GPRS communication module
Disconnected after controlling the of short duration closures of the remote control separating brake contact K2, be transferred to for closing locking instruction again micro- by client after success separating brake
Processor, closing locking contact BS obtains electrically disconnected, and client cannot again be input into closing locking instruction, institute after success closing locking
State switching winding FJ coil obtain it is electric carry out separating brake action, the first normally-closed contact FJ2 disconnects, so that shutting-brake control loop
Power-off, the coil losing electricity of the closing coil HJ, the first normally opened contact HJ1, the second normally opened contact HJ2 disconnect, and close a floodgate
Control loop is powered off, the second normally-closed contact HJ3 closure, the coil of the switching winding FJ persistently it is electric, the described 4th is normal
Contact HJ4 disconnections are opened, the combined floodgate warning light HD extinguishes, the 5th normally opened contact FJ3 closures, the separating brake warning light LD is lighted；
D, when user side carries out closing operation：
G, in gate-dividing state when, it is impossible to by key circuit key in separating brake instruct, user obtain operation password after, display
Module ejection operation password entry interface, is solved according to operation password entry interface by key circuit input operation password
Lock, the microprocessor control closing locking contact BS dead electricity closures, key circuit cannot be closed a floodgate again after successfully unlocking
Unblock operation；
H, reclosing command is keyed in by key circuit, disconnected after microprocessor control remote control closing contact K1 closure, or
Unclamped after pressing closing by hand button AH, the 3rd normally opened contact FJ1 is in closure state, shutting-brake control loop conducting, closing line
Enclose HJ coil obtain it is electric carry out feed motion, the second normally-closed contact HJ3 disconnects, the coil losing electricity of switching winding FJ, first
Normally-closed contact FJ2 is closed, the first normally opened contact HJ1 and the second normally opened contact HJ2 closure simultaneously self-sustainings, holds shutting-brake control loop
Continuous conducting, and combined floodgate warning light HD is lighted, separating brake warning light LD extinguishes；
E, carry out remote switching operate when：
I, in gate-dividing state when, client cannot be input into separating brake instruction, in client ejection operation password entry dialogue
Frame, user will operate password entry client, client that operation password, combined floodgate unlock instruction and reclosing command are passed through into server
To microprocessor, the microprocessor is received and controls the closing locking contact BS dead electricity to close and remote control conjunction remote transmission
Disconnected after the of short duration closures of K1 of lock contact, client cannot again carry out close a floodgate unblock operation, the 3rd normally opened contact after successfully unlocking
FJ1 is in closure state, shutting-brake control loop conducting, the coil of closing coil HJ obtain it is electric carry out feed motion, second normally closed touches
Point HJ3 disconnects, the coil losing electricity of switching winding FJ, the first normally-closed contact FJ2 closures, the first normally opened contact HJ1 and second normally opened
Contact HJ2 closures and self-sustaining, make shutting-brake control loop constant conduction, and combined floodgate warning light HD is lighted, and separating brake warning light LD puts out
Go out；
It is described micro- when setting up connection again after communicating interrupt between F, the server and microprocessor and/or client
Processor is immediately sent to server "on" position, gate-dividing state and closing locking state, and the server will close a floodgate in real time
State, gate-dividing state and closing locking state synchronized are to client.
The beneficial effects of the invention are as follows, this grid side anti-islanding system generated electricity by way of merging two or more grid systems for distributed photovoltaic and its control
Method processed, is designed to simple cleverly combined floodgate, separating brake and controls back using the conventional component such as closing coil, switching winding, contact
Road, reaches the combined floodgate to distributed photovoltaic power generation station, separating brake and reliably controls, after power distribution network power failure, grid-connected switch principle
On should pull open, grid side staff can in time pass through client remote locking shutting-brake control loop, prevent it is grid-connected switch again
The secondary connection closed a floodgate between cut-out photovoltaic power station and power distribution network, it is ensured that do not have during electric current falls to deliver to dead line, protect
The life security of maintainer is demonstrate,proved, power failure equipments do not result in damage yet, it is often more important that due to depositing for closing locking contact
In, user side if it is intended to the mandate of the staff that must obtain distribution net side that close a floodgate could enter to combined floodgate latch contact
Row unblock, so that before power distribution network is powered again, shutting-brake control is controlled by the staff of power distribution network completely, prevents from using
The maloperation of family side, gate-dividing state obtains reliable maintenance, so as to be further ensured that electric current will not deliver to maintenance circuit.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is electrically dividing for the grid side anti-islanding system optimal embodiment that the present invention is generated electricity by way of merging two or more grid systems for distributed photovoltaic
Butut.
Fig. 2 is the framework of the grid side anti-islanding system optimal embodiment that the present invention is generated electricity by way of merging two or more grid systems for distributed photovoltaic
Figure.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.These accompanying drawings are simplified schematic diagram, only with
Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant with the present invention.
As shown in Fig. 1~2, the invention provides a kind of grid side anti-islanding system generated electricity by way of merging two or more grid systems for distributed photovoltaic
System, including grid-connected switch cubicle, the secondary circuit of grid-connected switch cubicle include closing coil HJ, switching winding FJ, remote control closing contact
K1, remote control separating brake contact K2, closing by hand button AH, manual brake separating button AF, closing locking contact BS, the first normally opened contact
HJ1, the second normally opened contact HJ2, the 3rd normally opened contact FJ1, the first normally-closed contact FJ2 and the second normally-closed contact HJ3, closing coil
HJ controls the first normally opened contact HJ1, the second normally opened contact HJ2 and the second normally-closed contact HJ3, switching winding FJ control the 3rd normally opened
Contact FJ1 and the first normally-closed contact FJ2, closing locking contact BS are normally-closed contact,
First normally opened contact HJ1 connected with the first normally-closed contact FJ2 after respectively with remote control closing contact K1 and closing by hand
Button AH is in parallel, and termination a first power end KM+, closing locking contact BS is in parallel after being connected with the 3rd normally opened contact FJ1
Close a floodgate and touch with remote control with the first normally-closed contact FJ2, closing by hand button AH at the two ends of the second normally opened contact HJ2, and one end
The other end connection of point K1, the coil two ends of closing coil HJ respectively with the second normally opened contact HJ2 and the 3rd normally opened contact FJ1
Other end and second source end KM- connection, so as to form shutting-brake control loop；
Latter termination first in parallel with remote control separating brake contact K2 and manual brake separating button AF is electric respectively for second normally-closed contact HJ3
Source KM+, other end is connected with coil one end of switching winding FJ, another termination second source end of coil of switching winding FJ
KM-, so as to form separating brake control loop；
Also include combined floodgate warning light HD, separating brake warning light for the grid side anti-islanding system that distributed photovoltaic generates electricity by way of merging two or more grid systems
LD, the 4th normally opened contact HJ4 and the 5th normally opened contact FJ3, closing coil HJ controls the 4th normally opened contact HJ4, switching winding FJ
Control the 5th normally opened contact FJ3, the first power end KM+, combined floodgate warning light HD, the 4th normally opened contact HJ4 and second source end KM-
It is sequentially connected in series to form combined floodgate prompting loop, the first power end KM+, separating brake warning light LD, the 5th normally opened contact FJ3 and second source
End KM- is sequentially connected in series to form separating brake prompting loop.
Also include control cabinet for the grid side anti-islanding system that distributed photovoltaic generates electricity by way of merging two or more grid systems, be provided with control cabinet interior
The microprocessor of system program is put, the closed procedure to combined floodgate latch contact BS is encrypted, operation password is obtained at the same time
Closing locking contact BS dead electricity closures are controlled during with combined floodgate unlock instruction, microprocessor is controlled back with shutting-brake control loop, separating brake
Road and separating brake prompting loop connection, microprocessor have
Combined floodgate input, connects remote control closing contact K1, and microprocessor receives reclosing command, control remote control closing contact K1
Closure；
Separating brake input, connects remote control separating brake contact K2, and microprocessor receives separating brake instruction, control remote control separating brake contact K2
Closure；
Closing locking input, connects closing locking contact BS, and microprocessor receives closing locking instruction or unblock of closing a floodgate
Instruction, control closing locking contact BS is opened or closed；
Microprocessor is also associated with
Display module, display shutting-brake control loop, separating brake control loop, separating brake prompting loop and closing locking contact BS's
Real-time status, the operation interface of display combined floodgate, separating brake and closing locking, when closing operation is carried out, display operation password entry
Interface；
Key circuit, in shutting-brake control loop, separating brake control loop, separating brake prompting loop, closing locking contact BS
Real-time status display interface, operation is switched between combined floodgate, separating brake and the operation interface of closing locking, and will close a floodgate,
Separating brake, close a floodgate unblock and closing locking instruction be typed into microprocessor, carry out close a floodgate unblock operation when, for microprocessor
Device input operation password；
Display module includes touch liquid crystal screen and the first drive circuit, and key circuit includes button and the second drive circuit,
Button is the set of local touch point on touch liquid crystal screen, and the second drive circuit is integrated in the first drive circuit；
The grid side anti-islanding system generated electricity by way of merging two or more grid systems for distributed photovoltaic also includes server and is networked with server
Client, server and microprocessor telecommunication, the built-in control software of client, for that will be closed a floodgate by access server,
Separating brake, unblock of closing a floodgate, closing locking instruction and operation password remote transmission are in microprocessor and obtain "on" position, separating brake shape
State and closing locking state simultaneously show；
Microprocessor be also associated with for power not between have a power failure source；
Microprocessor is also associated with USB communication module, for typing in the microprocessor or renewal system program；
Microprocessor is also associated with GPRS communication module, and combined floodgate, separating brake, combined floodgate unblock, closing locking are obtained for long-range
Instruction and operation password, and "on" position, gate-dividing state and closing locking state are sent；
Display module, key circuit, not between power failure source, USB communication module and GPRS communication module be arranged at control cabinet
In.
A kind of control method of the grid side anti-islanding system generated electricity by way of merging two or more grid systems for distributed photovoltaic, comprises the following steps：
A, when manually opening button carries out sub-switching operation to user side：
A, press and unclamp after manual brake separating button, the coil of switching winding FJ obtain it is electric carry out separating brake action, first normally closed touches
Point FJ2 disconnects, so that shutting-brake control loop disconnects, the coil losing electricity of closing coil HJ is the first normally opened contact HJ1, second normal
Open contact HJ2 to disconnect, shutting-brake control loop power-off, the second normally-closed contact HJ3 closures, the coil of switching winding FJ is persistently obtained
Electricity, the 4th normally opened contact HJ4 is disconnected, and combined floodgate warning light HD extinguishes, and the 5th normally opened contact FJ3 closures, separating brake warning light LD is lighted；
B, microprocessor show gate-dividing state and closing locking state in real time on display module, if closing locking is touched
Point BS is still within closure state, then being input into closing locking by key circuit instructs, and microprocessor is connected to closing locking instruction
Control closing locking contact BS obtains electrically disconnected afterwards, and key circuit cannot be input into closing locking instruction during success closing locking；
Gate-dividing state and closing locking status remote are transferred to server by c, microprocessor by GPRS communication module, visitor
Family end access server obtains gate-dividing state and closing locking state, if closing locking contact BS is still within closed form
Closing locking is instructed and is transferred to microprocessor, microprocessor control closing locking contact by Server remote by state, client
BS obtains electrically disconnected, and client cannot be input into closing locking instruction during success closing locking；
B, when user side carries out sub-switching operation by key circuit：
D, in "on" position when, it is impossible to by key circuit key in reclosing command, closing locking instruct and closed a floodgate
Unblock operation, according to separating brake and the operation interface of closing locking, keys in separating brake and instructs by key circuit to microprocessor, micro- place
Disconnected after the reason device control remote control separating brake of short duration closures of contact K2, key circuit is input into closing locking instruction again after success separating brake, micro-
Processor control closing locking contact BS obtains electrically disconnected, and key circuit cannot again be input into closing locking and refer to after success closing locking
Order, the coil of switching winding FJ obtain it is electric carry out separating brake action, the first normally-closed contact FJ2 disconnects, so that shutting-brake control loop is disconnected
Open, the coil losing electricity of closing coil HJ, the first normally opened contact HJ1, the second normally opened contact HJ2 disconnect, shutting-brake control loop is broken
Electricity, the second normally-closed contact HJ3 closures, the coil of switching winding FJ persistently it is electric, the 4th normally opened contact HJ4 disconnects, and closes a floodgate and points out
Lamp HD extinguishes, and the 5th normally opened contact FJ3 closures, separating brake warning light LD is lighted；
Gate-dividing state and closing locking status remote are transferred to server by e, microprocessor by GPRS communication module, visitor
Family end access server obtains gate-dividing state and closing locking state, if closing locking contact BS is still within closed form
Closing locking is instructed and is transferred to microprocessor, microprocessor control closing locking contact by Server remote by state, client
BS obtains electrically disconnected, and client cannot be input into closing locking instruction during success closing locking；
C, when carrying out long-range sub-switching operation：
F, in "on" position when, client cannot be input into reclosing command, closing locking instruction and combined floodgate unlock instruction, visitor
Separating brake instruction is transferred to microprocessor by family end by Server remote, and microprocessor is received and controlled by GPRS communication module
Disconnected after the of short duration closures of remote control separating brake contact K2, closing locking instruction is transferred to microprocessor by client again after success separating brake,
Closing locking contact BS obtains electrically disconnected, and client cannot again be input into closing locking instruction, switching winding after success closing locking
The coil of FJ obtain it is electric carry out separating brake action, the first normally-closed contact FJ2 disconnects so that shutting-brake control loop is powered off, closing coil
The coil losing electricity of HJ, the first normally opened contact HJ1, the second normally opened contact HJ2 disconnect, shutting-brake control loop power-off, and second is normally closed
Contact HJ3 is closed, the coil of switching winding FJ persistently it is electric, the 4th normally opened contact HJ4 disconnects, combined floodgate warning light HD extinguishings, the
Five normally opened contact FJ3 are closed, and separating brake warning light LD is lighted；
D, when user side carries out closing operation：
G, in gate-dividing state when, it is impossible to by key circuit key in separating brake instruct, user obtain operation password after, display
Module ejection operation password entry interface, is solved according to operation password entry interface by key circuit input operation password
Lock, microprocessor control closing locking contact BS dead electricity closures, key circuit cannot again carry out combined floodgate unblock after successfully unlocking
Operation；
H, reclosing command is keyed in by key circuit, disconnected after microprocessor control remote control closing contact K1 closure, or
Unclamped after pressing closing by hand button AH, the 3rd normally opened contact FJ1 is in closure state, shutting-brake control loop conducting, closing line
Enclose HJ coil obtain it is electric carry out feed motion, the second normally-closed contact HJ3 disconnects, the coil losing electricity of switching winding FJ, and first is normally closed
Contact FJ2 is closed, the first normally opened contact HJ1 and the second normally opened contact HJ2 closure simultaneously self-sustainings, shutting-brake control loop is persistently led
It is logical, and combined floodgate warning light HD is lighted, separating brake warning light LD extinguishes；
E, carry out remote switching operate when：
I, in gate-dividing state when, client cannot be input into separating brake instruction, in client ejection operation password entry dialogue
Frame, user will operate password entry client, client that operation password, combined floodgate unlock instruction and reclosing command are passed through into server
To microprocessor, microprocessor is received and controls closing locking contact BS dead electricity closure and remote control closing contact K1 remote transmission
Disconnected after of short duration closure, client cannot again carry out unblock operation of closing a floodgate after successfully unlocking, the 3rd normally opened contact FJ1 is in and closes
Conjunction state, shutting-brake control loop conducting, the coil of closing coil HJ obtain it is electric carry out feed motion, the second normally-closed contact HJ3 disconnects,
The coil losing electricity of switching winding FJ, the first normally-closed contact FJ2 closures, the first normally opened contact HJ1 and the second normally opened contact HJ2 is closed
And self-sustaining, make shutting-brake control loop constant conduction, and combined floodgate warning light HD is lighted, separating brake warning light LD extinguishes；
When setting up connection again after communicating interrupt between F, server and microprocessor and/or client, microprocessor stands
Will "on" position, gate-dividing state and closing locking state send to server, server is in real time by "on" position, gate-dividing state
With closing locking state synchronized to client.
With above-mentioned according to desirable embodiment of the invention as enlightenment, by above-mentioned description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property scope is not limited to the content on specification, it is necessary to its technical scope is determined according to right.
Claims (10)
1. a kind of grid side anti-islanding system generated electricity by way of merging two or more grid systems for distributed photovoltaic, it is characterised in that：Including grid-connected switch cubicle,
The secondary circuit of the grid-connected switch cubicle includes closing coil HJ, switching winding FJ, remote control closing contact K1, remote control separating brake contact
K2, closing by hand button AH, manual brake separating button AF, closing locking contact BS, the first normally opened contact HJ1, the second normally opened contact
HJ2, the 3rd normally opened contact FJ1, the first normally-closed contact FJ2 and the second normally-closed contact HJ3, closing coil HJ control described the
One normally opened contact HJ1, the second normally opened contact HJ2 and the second normally-closed contact HJ3, the switching winding FJ control the 3rd normally opened contact
FJ1 and the first normally-closed contact FJ2, the closing locking contact BS are normally-closed contact,
The first normally opened contact HJ1 connected with the first normally-closed contact FJ2 after respectively with remote control closing contact K1 and closing by hand
Button AH is in parallel, and a first power end KM+ of termination, after the closing locking contact BS connects with the 3rd normally opened contact FJ1
The two ends of the second normally opened contact HJ2 are connected in parallel on, and one end is closed with the first normally-closed contact FJ2, closing by hand button AH with remote control
The other end connection of lock contact K1, the coil two ends of the closing coil HJ respectively with the second normally opened contact HJ2 and the
Other end and second source end the KM- connection of three normally opened contact FJ1, so as to form shutting-brake control loop；
The second normally-closed contact HJ3 latter terminations the in parallel with the remote control separating brake contact K2 and manual brake separating button AF respectively
One power end KM+, other end is connected with coil one end of the switching winding FJ, the coil other end of the switching winding FJ
Second source end KM- is met, so as to form separating brake control loop.
2. the grid side anti-islanding system generated electricity by way of merging two or more grid systems for distributed photovoltaic as claimed in claim 1, it is characterised in that：Also
Including combined floodgate warning light HD, separating brake warning light LD, the 4th normally opened contact HJ4 and the 5th normally opened contact FJ3, the closing coil HJ
The 4th normally opened contact HJ4, the switching winding FJ is controlled to control the 5th normally opened contact FJ3, first power end
KM+, combined floodgate warning light HD, the 4th normally opened contact HJ4 and second source end KM- are sequentially connected in series to form combined floodgate prompting loop, described
First power end KM+, separating brake warning light LD, the 5th normally opened contact FJ3 and second source end KM- are sequentially connected in series to form separating brake prompting
Loop.
3. the grid side anti-islanding system generated electricity by way of merging two or more grid systems for distributed photovoltaic as claimed in claim 2, it is characterised in that：Also
Including control cabinet, the microprocessor of built-in system program is provided with the control cabinet, to the closure behaviour of combined floodgate latch contact BS
Encrypted, control closing locking contact BS dead electricity closures, institute when obtaining operation password and combined floodgate unlock instruction at the same time
State microprocessor to be connected with the shutting-brake control loop, separating brake control loop and separating brake prompting loop, the microprocessor has
Combined floodgate input, connects the remote control closing contact K1, and microprocessor receives reclosing command, controls the remote control to close a floodgate and touches
Point K1 is closed；
Separating brake input, connects the remote control separating brake contact K2, and microprocessor receives separating brake instruction, controls the remote control separating brake to touch
Point K2 is closed；
Closing locking input, connects the closing locking contact BS, and microprocessor receives closing locking instruction or unblock of closing a floodgate
Instruction, control closing locking contact BS is opened or closed.
4. the grid side anti-islanding system generated electricity by way of merging two or more grid systems for distributed photovoltaic as claimed in claim 3, it is characterised in that：Institute
Microprocessor is stated to be also associated with
Display module, display shutting-brake control loop, separating brake control loop, separating brake prompting loop and closing locking contact BS's is real-time
State, the operation interface of display combined floodgate, separating brake and closing locking, when closing operation is carried out, display operation password entry interface；
Key circuit, the reality for pointing out loop, closing locking contact BS in shutting-brake control loop, separating brake control loop, separating brake
When state display interface, operation is switched between combined floodgate, separating brake and the operation interface of closing locking, and by combined floodgate, separating brake,
Unblock of closing a floodgate is instructed with closing locking and is typed into microprocessor, when unblock operation close a floodgate, for defeated to microprocessor
Enter to operate password.
5. the grid side anti-islanding system generated electricity by way of merging two or more grid systems for distributed photovoltaic as claimed in claim 4, it is characterised in that：Institute
Stating display module includes touch liquid crystal screen and the first drive circuit, and the key circuit includes button and the second drive circuit, institute
The set that button is local touch point on the touch liquid crystal screen is stated, second drive circuit is integrated in the first drive circuit.
6. the grid side anti-islanding system generated electricity by way of merging two or more grid systems for distributed photovoltaic as claimed in claim 4, it is characterised in that：Also
The client networked including server and with the server, the server and the microprocessor telecommunication, the visitor
The built-in control software in family end, for being instructed and gathering hole combined floodgate, separating brake, unblock of closing a floodgate, closing locking by access server
Remote transmission is made in the microprocessor and is obtained "on" position, gate-dividing state and closing locking state and is shown.
7. the grid side anti-islanding system generated electricity by way of merging two or more grid systems for distributed photovoltaic as claimed in claim 4, it is characterised in that：Institute
State microprocessor be also associated with for power not between have a power failure source.
8. the grid side anti-islanding system generated electricity by way of merging two or more grid systems for distributed photovoltaic as claimed in claim 4, it is characterised in that：Institute
State microprocessor and be also associated with USB communication module, for the typing in the microprocessor or renewal system program.
9. the grid side anti-islanding system generated electricity by way of merging two or more grid systems for distributed photovoltaic as claimed in claim 6, it is characterised in that：Institute
State microprocessor and be also associated with GPRS communication module, for it is long-range obtain combined floodgates, separating brake, unblock of closing a floodgate, closing locking instruct and
Operation password, and "on" position, gate-dividing state and closing locking state are sent.
10. the controlling party of the grid side anti-islanding system generated electricity by way of merging two or more grid systems for distributed photovoltaic as described in claim 6 or 9
Method, it is characterised in that：Comprise the following steps：
A, when user side carries out sub-switching operation by the manual brake separating button：
A, press and unclamp after the manual brake separating button, the coil of the switching winding FJ obtain it is electric carry out separating brake action, described the
One normally-closed contact FJ2 disconnects, so that shutting-brake control loop disconnects, the coil losing electricity of the closing coil HJ, described first is normal
Open contact HJ1, the second normally opened contact HJ2 to disconnect, shutting-brake control loop power-off, the second normally-closed contact HJ3 closures are described
The coil of switching winding FJ persistently it is electric, the 4th normally opened contact HJ4 disconnects, and the combined floodgate warning light HD extinguishes, 5 constant virtues
Contact FJ3 closures are opened, the separating brake warning light LD is lighted；
B, the microprocessor show gate-dividing state and closing locking state in real time on display module, if the combined floodgate is closed
Lock contact BS is still within closure state, then being input into closing locking by key circuit instructs, and microprocessor is connected to closing locking
Closing locking contact BS is controlled to obtain electrically disconnected after instruction, key circuit cannot be input into closing locking instruction during success closing locking；
Gate-dividing state and closing locking status remote are transferred to server by c, the microprocessor by GPRS communication module, institute
State client access server to obtain gate-dividing state and closing locking state, if the closing locking contact BS is still within
Closing locking is instructed and is transferred to microprocessor by Server remote by closure state, client, and the microprocessor control is closed
Lock latch contact BS obtains electrically disconnected, and client cannot be input into closing locking instruction during success closing locking；
B, when user side carries out sub-switching operation by key circuit：
D, in "on" position when, it is impossible to reclosing command, closing locking are keyed in by key circuit and are instructed and is carried out combined floodgate unblock
Operation, according to separating brake and the operation interface of closing locking, keys in separating brake and instructs by key circuit to microprocessor, micro- place
Disconnected after the reason device control of short duration closures of the remote control separating brake contact K2, key circuit is input into closing locking and refers to again after success separating brake
Order, microprocessor control closing locking contact BS obtains electrically disconnected, and key circuit cannot again be input into combined floodgate after success closing locking
Blocking order, the coil of the switching winding FJ obtain it is electric carry out separating brake action, the first normally-closed contact FJ2 disconnects so that
Shutting-brake control loop disconnects, the coil losing electricity of the closing coil HJ, the first normally opened contact HJ1, the second normally opened contact HJ2
Disconnect, shutting-brake control loop power-off, the second normally-closed contact HJ3 closure, the coil of the switching winding FJ persistently it is electric,
The 4th normally opened contact HJ4 disconnects, and the combined floodgate warning light HD extinguishes, the 5th normally opened contact FJ3 closures, the separating brake prompting
Lamp LD is lighted；
Gate-dividing state and closing locking status remote are transferred to server by e, the microprocessor by GPRS communication module, institute
State client access server to obtain gate-dividing state and closing locking state, if the closing locking contact BS is still within
Closing locking is instructed and is transferred to microprocessor by Server remote by closure state, client, and the microprocessor control is closed
Lock latch contact BS obtains electrically disconnected, and client cannot be input into closing locking instruction during success closing locking；
C, when carrying out long-range sub-switching operation：
F, in "on" position when, client cannot be input into reclosing command, closing locking instruction and combined floodgate unlock instruction, client
Separating brake instruction is transferred to microprocessor by Server remote, the microprocessor is received and controlled by GPRS communication module
Disconnected after the of short duration closures of the remote control separating brake contact K2, closing locking instruction is transferred to microprocessor by client again after success separating brake
Device, closing locking contact BS obtains electrically disconnected, and client cannot again be input into closing locking instruction, described point after success closing locking
The coil of brake cable circle FJ obtain it is electric carry out separating brake action, the first normally-closed contact FJ2 disconnects, so that shutting-brake control loop is disconnected
Electricity, the coil losing electricity of the closing coil HJ, the first normally opened contact HJ1, the second normally opened contact HJ2 disconnect, control of closing a floodgate
Loop processed power-off, the second normally-closed contact HJ3 closures, the coil of the switching winding FJ persistently it is electric, the described 4th is normally opened
Contact HJ4 is disconnected, and the combined floodgate warning light HD extinguishes, and the 5th normally opened contact FJ3 closures, the separating brake warning light LD is lighted；
D, when user side carries out closing operation：
G, in gate-dividing state when, it is impossible to by key circuit key in separating brake instruct, user obtain operation password after, display module
Ejection operation password entry interface, is unlocked, institute according to operation password entry interface by key circuit input operation password
Microprocessor control closing locking contact BS dead electricity closures are stated, key circuit cannot again carry out the unblock behaviour that closes a floodgate after successfully unlocking
Make；
H, reclosing command is keyed in by key circuit, disconnected after microprocessor control remote control closing contact K1 closure, or press
Unclamped after closing by hand button AH, the 3rd normally opened contact FJ1 is in closure state, shutting-brake control loop conducting, closing coil HJ
Coil obtain it is electric carry out feed motion, the second normally-closed contact HJ3 disconnects, the coil losing electricity of switching winding FJ, and first is normally closed
Contact FJ2 is closed, the first normally opened contact HJ1 and the second normally opened contact HJ2 closure simultaneously self-sustainings, shutting-brake control loop is persistently led
It is logical, and combined floodgate warning light HD is lighted, separating brake warning light LD extinguishes；
E, carry out remote switching operate when：
I, in gate-dividing state when, client cannot be input into separating brake instruction, ejection operation password entry dialog box in client, use
Family will operate password entry client, client that operation password, combined floodgate unlock instruction and reclosing command are passed through into Server remote
Microprocessor is transferred to, the microprocessor is received and controls the closing locking contact BS dead electricity closure and remote control to close a floodgate and touch
Disconnected after the of short duration closures of point K1, client cannot again carry out unblock operation of closing a floodgate after successfully unlocking, at the 3rd normally opened contact FJ1
In closure state, shutting-brake control loop conducting, the coil of closing coil HJ is obtained and electric carries out feed motion, the second normally-closed contact HJ3
Disconnection, the coil losing electricity of switching winding FJ, the first normally-closed contact FJ2 closures, the first normally opened contact HJ1 and the second normally opened contact
HJ2 closures and self-sustaining, make shutting-brake control loop constant conduction, and combined floodgate warning light HD is lighted, and separating brake warning light LD extinguishes；
When setting up connection again after communicating interrupt between F, the server and microprocessor and/or client, the microprocessor
Device is immediately sent to server "on" position, gate-dividing state and closing locking state, the server in real time by "on" position,
Gate-dividing state and closing locking state synchronized are to client.
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|---|---|---|---|
| CN201410115486.3A CN104953610B (en) | 2014-03-26 | 2014-03-26 | For grid side anti-islanding system and its control method that distributed photovoltaic generates electricity by way of merging two or more grid systems |
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| CN201410115486.3A CN104953610B (en) | 2014-03-26 | 2014-03-26 | For grid side anti-islanding system and its control method that distributed photovoltaic generates electricity by way of merging two or more grid systems |
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| CN109510244B (en) * | 2018-12-29 | 2023-09-22 | 国网山东省电力公司泰安供电公司 | Low-voltage distributed photovoltaic switching control device and system |
| CN111555352A (en) * | 2020-05-25 | 2020-08-18 | 广西电网有限责任公司玉林供电局 | Photovoltaic low-voltage protection equipment, control method, control device and storage medium |
| CN112886642B (en) * | 2021-03-19 | 2022-11-18 | 厦门科华数能科技有限公司 | Double-ammeter redundant grid-connected and off-grid control circuit and micro-grid system |
| CN114529070B (en) * | 2022-02-08 | 2024-04-19 | 天津大学 | Comprehensive energy microgrid optimal control method considering random power failure energy supply reliability |
| CN116780780B (en) * | 2023-08-18 | 2024-01-26 | 江西清华泰豪三波电机有限公司 | Power supply control device |
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| CN201044360Y (en) * | 2006-09-19 | 2008-04-02 | 余东成 | Intelligent high-voltage electricity-saving compensation circuit device |
| CN201909821U (en) * | 2010-12-07 | 2011-07-27 | 大庆石油管理局 | Spare power automatic switching device tester |
| CN103138268A (en) * | 2013-02-25 | 2013-06-05 | 国家电网公司 | Low-voltage anti-island device of distributed photovoltaic power generation systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9287714B2 (en) * | 2011-11-30 | 2016-03-15 | Michael Ropp | Method and system for island detection and anti-islanding protection in distributed power generation systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201044360Y (en) * | 2006-09-19 | 2008-04-02 | 余东成 | Intelligent high-voltage electricity-saving compensation circuit device |
| CN201909821U (en) * | 2010-12-07 | 2011-07-27 | 大庆石油管理局 | Spare power automatic switching device tester |
| CN103138268A (en) * | 2013-02-25 | 2013-06-05 | 国家电网公司 | Low-voltage anti-island device of distributed photovoltaic power generation systems |
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