CN110165786A - A kind of intelligent low-pressure photovoltaic counnter attack power transmission monitor control system - Google Patents
A kind of intelligent low-pressure photovoltaic counnter attack power transmission monitor control system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00019—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 optical means
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings 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
- 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
- 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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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Abstract
A kind of intelligent low-pressure photovoltaic counnter attack power transmission monitor control system, is related to electrical equipment technical field.When public network interruption maintenance, voltage monitoring unit acquires public network voltage fluctuation signal, and it is uploaded to control unit, the voltage of acquisition and preset threshold values compare, when beyond threshold values, operating unit control switch separating brake disconnects public network and connect with photovoltaic user, communication unit is communicated with operation maintenance personnel in time, telling switch state；After public network side restores electricity, operating unit control switch is closed a floodgate, and is restored public network and is connect with photovoltaic user.Intelligent low-pressure photovoltaic counnter attack power transmission monitor control system of the invention, voltage monitoring unit can realize public network voltage real-time monitoring.Motor-operating mechanism can make to switch reliable switching on and off.Control unit accurately analyzes the voltage of voltage monitoring unit acquisition, and controls operating mechanism movement, finally acquires switch actuating signals and passes to communication module, communication module sends switch state to operation maintenance personnel mobile phone immediately after switch motion.
Description
Technical field
The present invention relates to electrical equipment technical fields, are specifically related to a kind of intelligent low-pressure photovoltaic counnter attack power transmission monitoring control
System.
Background technique
Solar energy is that the mankind take the inexhaustible reliable energy as a kind of green energy resource.Devoting Major Efforts To Developing and utilize solar energy
It is the only way for setting up cleaning and sustainable development source system.Solar energy power generating is most flexibly square using solar energy
Just a kind of mode, it is in widespread attention in the world in recent years and make significant progress.Therefore, it furthers investigate grid-connected
Electricity generation system, for saving conventional energy resource, protection environment, promoting economic development has particularly important realistic meaning and far-reaching
Historic significance.
A large amount of distributed generation resources are grid-connected, and power distribution network is made to become one throughout power supply and use by the single-terminal network of conventional radiation formula
The multiterminal network of family interconnection, the direction of energy no longer uniaxially flow to each load from substation bus bar, in the area of scheduled outage maintenance
It is possible to the distributed generation resource that there can be " isolated island " operation in domain, causes " anti-power transmission ", becomes and threatens the new of service personnel's safety
Risk.Inverter class distributed generation resource access system, since its power supply and load mismatch, load relies on public electric wire net power supply
Degree is high, after public electric wire net power-off, prevents " isolated island " from running by inverter.But in actual operation, user's gird-connected inverter exists
Some hidden danger cannot function as preventing the equipment that " anti-power transmission " uniquely trusts.Distributed electrical source grid-connected inverter belongs to user's assets, can
Autonomous selection equipment manufacturer, public electric wire net repair and maintenance unit are difficult to grasp and control equipment quality, and distributed electrical source user
General lack of professional knowledge, implements basic securities measures such as " power failure, electrical verification, ground connection, installing fence and nameplates " and have difficulties.
Simultaneously as inverter and low-pressure grid-connection point, which cut-off equipment, does not have obvious breaking point, grid maintenance operating personnel can not directly really
Recognize its state.Carry out interruption maintenance work in the low-voltage network for having accessed distributed generation resource, exists through 220V/380V voltage
The grid-connected distributed generation resource of grade " anti-power transmission " risk forms micro- electricity especially when user equipment energy-storage travelling wave tube
The probability of net " isolated island " operation is high, prevents that " anti-power transmission " pressure is big.
It investigates and finds by early-stage study, " power distribution network low pressure anti-islanding device design principle and parameter calculate " is to be directed to
Isolated operation mechanism in distributed photovoltaic power generation system inverter and anti-isolated island Preservation tactics in 220V/380V power distribution network.
" realization of the photovoltaic monitoring system based on wireless communication and Android phone " is based on WiFi communication and Android intelligence
The photovoltaic monitoring system that cell phone client is shown mainly monitors parameters when photovoltaic power generation, realizes to photovoltaic generating system
Real-time monitoring.But above-mentioned several similar techniques cannot achieve when public network scheduled outage maintenance, automatically cut off photovoltaic use
Connection between family and public network；When public network voltage restores normal (completing maintenance), but it is automatic restore photovoltaic user and public network it
Between connection.Therefore, it is imperative to design a kind of intelligent low-pressure photovoltaic counnter attack power transmission monitor control system.
Summary of the invention
The purpose of the present invention is provide a kind of intelligent low-pressure photovoltaic counnter attack power transmission monitoring control in view of the deficiencies of the prior art
System processed.
To achieve the goals above, the technical scheme adopted by the invention is as follows: a kind of intelligent low-pressure photovoltaic counnter attack power transmission prison
Survey control system, public network enters the indoor distribution box of user terminal by power supply company's metering cabinet, indoor distribution box with inside user
Load is connected；Photovoltaic plant and inverter are connected by exchanging grid-connected switch with user side power generation batch meter, photovoltaic power generation
It is directly powered to user's internal load in power generation metering electric energy meter access indoor distribution box or conveys electric energy to public network side, it should
System is mainly made of operating mechanism and control mechanism；Operating mechanism is placed in power supply company's metering cabinet, for cutting off, being closed public affairs
Connection between net and user side is made of operating unit, motor and switch, and operating unit receives divide-shut brake signal and controls
Motor action processed, the opening and closing of motor control switch are to realize the connection between cutting, closure public network and user side；Control
Mechanism processed is made of voltage monitoring unit, control unit and communication module, is placed in public network side；The voltage monitoring list of control mechanism
The operating unit of member and operating mechanism, which is connected to each other, realizes that divide-shut brake signal transmits；Voltage monitoring unit supervises public network voltage in real time
It surveys and is controlled to the voltage that control unit output signal, control unit analysis voltage monitoring unit acquire, and to operating unit sending
Signal processed, to realize switch open or close；Control unit acquisition switch actuating signals simultaneously pass to communication module, communication module
Immediately switching-state information is sent to operation maintenance personnel.
As the optimal technical scheme of intelligent low-pressure photovoltaic counnter attack power transmission monitor control system of the invention, the control is single
Member is made of three-phase-voltage monitoring circuit and microprocessor, and three-phase-voltage monitoring circuit mainly completes three-phase phase voltage to be converted into
The voltage signal of low pressure, makes its input controller carry out AD sampling, and whether controller judges three-phase voltage according to the result of sampling
It is decompression, under-voltage, normal；The Pic16f616 single-chip microcontroller that microprocessor selects the human relations of Huzhou Thailand to produce, can reliably issue control signal
To operating unit and communication unit.
As the optimal technical scheme of intelligent low-pressure photovoltaic counnter attack power transmission monitor control system of the invention, the operation is single
Member is delayed ten seconds when voltage is higher than voltage rating 7% or is lower than voltage rating 10%, if voltage is still abnormal after ten seconds,
Separating brake instruction is issued, voltage restores to selected range, and be delayed 30 seconds sending reclosing commands.
The present invention at the separation of user and public network by installing an operating unit and control switch additional, while in public network
Upper setting voltage monitoring and control unit, when public network interruption maintenance, voltage monitoring unit acquires public network voltage fluctuation signal, and
It is uploaded to control unit, the voltage of acquisition and preset threshold values compare, when exceeding threshold values, operating unit control switch point
Lock disconnects public network and connect with photovoltaic user, and communication unit is communicated with operation maintenance personnel in time, telling switch state；When public network side is extensive
After multiple power supply, operating unit control switch is closed a floodgate, and is restored public network and is connect with photovoltaic user.
Compared with prior art, beneficial effects of the present invention are shown:
(1) compared with " power distribution network low pressure anti-islanding device design principle and parameter calculate ", the present invention is in public network side model
It encloses interior mounting device and acquires data.Compared with " realization of the photovoltaic monitoring system based on wireless communication and Android phone ",
The present invention is to be monitored to switch action situation, then feed back to field personnel by certain communication mode.When public network line
When trackside interruption maintenance, the connection between grid-connected user and public network can be cut off in time, action accuracy can reach 100%,
And operation maintenance personnel can in time, accurately know the connection status between grid-connected user and public network, delay can control at 1 minute
Within.
(2) intelligent low-pressure photovoltaic counnter attack power transmission monitor control system of the invention, voltage monitoring unit can realize public network
Voltage real-time monitoring, deviation is less than 2% within the scope of 85%Un to 115%Un.Motor-operating mechanism can make reliable point of switch, close
Lock acts accuracy rate up to 100%.Control unit designs the automatic control unit based on monolithic machine platform, accurate to analyze voltage prison
The voltage of unit acquisition is surveyed, and controls operating mechanism movement, finally acquire switch actuating signals and passes to communication module, process
Reliability reaches 100%.Communication module sends switch state to operation maintenance personnel mobile phone immediately after switch motion, is delayed 1 minute
It is interior.
Detailed description of the invention
Intelligent low-pressure photovoltaic counnter attack power transmission monitor control system of the invention is described in further detail below in conjunction with attached drawing.
Fig. 1 is the structural schematic diagram of intelligent low-pressure photovoltaic counnter attack power transmission monitor control system.
Fig. 2 is the partial structural diagram of intelligent low-pressure photovoltaic counnter attack power transmission monitor control system.
Fig. 3 is voltage acquisition original part test curve.
Fig. 4 is the hardware block diagram of communication module.
Fig. 5 is that (b) histogram is tested in movement accuracy rate (a) and switch motion.
Specific embodiment
It is common referring to " State Grid Corporation of China's distributed photovoltaic power generation access system typical design solution " XGF380-Z-1
Low pressure photovoltaic power generation grid-connecting wiring diagram is as shown in Figure 1:
Public network enters the indoor distribution box 13 of user terminal by power supply company's metering cabinet 15, indoor distribution box 13 with indoor
Portion's load 14 is connected, and provides power supply in no photovoltaic power generation.When photovoltaic plant is arranged in user terminal, photovoltaic plant and inverter
10 are connected by exchanging grid-connected switch 11 with user side power generation batch meter 12, and power generation metering electric energy meter 121 records photovoltaic power generation
Electric energy counts.Photovoltaic power generation is accessed in indoor distribution box 13 through power generation metering electric energy meter 121 and is directly supplied to user's internal load 14
Electricity conveys electric energy to public network side, and when conveying electric energy to public network side, the electric energy meter 151 in power supply company's metering cabinet 15 is recorded
The electric energy for importing public network counts.
Intelligent low-pressure photovoltaic counnter attack power transmission monitor control system of the invention is based on above-mentioned access design scheme and carries out
Design, referring to Figure 2 together, which is mainly made of operating mechanism 17 and control mechanism 16.Operating mechanism 17 is placed in confession
In electric company's metering cabinet 15, for cutting off, being closed the connection between public network and user side, by operating unit 171, motor
172 form with switch 173, and operating unit 171 receives divide-shut brake signal and simultaneously controls the movement of motor 172,172 control switch of motor
173 opening and closing are to realize the connection between cutting, closure public network and user side.Control mechanism 16 is by voltage monitoring list
Member 162, control unit 163 and communication module 161 form, and are placed in public network side.The voltage monitoring unit 162 of control mechanism 16 with
The operating unit 171 of operating mechanism 17, which is connected to each other, realizes that divide-shut brake signal transmits.Voltage monitoring unit 162 is real to public network voltage
When monitoring and to 163 output signal of control unit, control unit 163 analyzes the voltage of voltage monitoring unit acquisition, and to operation
Unit 171 issues control signal, to realize 173 open or close of switch.Control unit 163 acquires switch actuating signals and transmits
To communication module 161, communication module 161 sends switching-state information to operation maintenance personnel immediately.
Wherein, the composition and working principle of above-mentioned each component are as follows:
1, voltage monitoring unit
Voltage monitoring unit uses the voltage sensor of Qingzhou Weisheng, and collection voltages mode is induction type, when installation not
It needs to have a power failure, can be mounted directly or dismantle, acquisition precision is high, and can guarantee system not malfunction not tripping.Its voltage acquisition original part is surveyed
Try that data are as shown in table 1 and Fig. 3 shown in.
1 voltage acquisition original part test data of table
| Serial number | Voltage swing | Target component | Actual parameter | Error |
| 1 | 85%Un | 187V | 190V | + 1.6% |
| 2 | 87%Un | 191.4V | 194.3V | + 1.5% |
| 3 | 90%Un | 198V | 200.2V | + 1.0% |
| 4 | 93%Un | 204.6V | 202V | - 1.2% |
| 5 | 95%Un | 209V | 210.8 | + 0.9% |
| 6 | 97%Un | 213.4V | 211.8V | - 0.7% |
| 7 | 100%Un | 220V | 219V | - 0.5% |
| 8 | 103%Un | 226.6V | 228.3V | + 0.8% |
| 9 | 105%Un | 231V | 229.4V | + 0.7% |
| 10 | 107%Un | 235.4V | 233.6V | - 0.8% |
| 11 | 110%Un | 242V | 239.8V | - 0.9% |
| 12 | 115%Un | 253V | 255.3 | + 0.9% |
Can be seen that the voltage monitoring unit by table 1 and Fig. 3 can realize public network voltage real-time monitoring, 85%Un extremely
Deviation is less than 2% within the scope of 115%Un.
2, control unit
Control unit is made of three-phase-voltage monitoring circuit and microprocessor, and three-phase-voltage monitoring circuit is mainly completed three
Phase phase voltage is converted into the voltage signal of low pressure, its input controller is made to carry out AD sampling.Controller is sentenced according to the result of sampling
Disconnected three-phase voltage whether decompression, under-voltage, normal.The measuring circuit of three-phase voltage is as shown in Figure 2.Wherein Ua is A phase 220VAC electricity
Pressure, SignUA are the low pressure measurement signal of the opposite A phase voltage obtained after transformation, which directly inputs the AD of controller
Sampling end AN0, can reliable collection voltages information in test.
The Pic16f616 single-chip microcontroller that microprocessor selects the human relations of Huzhou Thailand to produce, characteristic are 8 machines, the current institute of stability
Have in single-chip microcontroller preferably, power consumption very little, only 2mA electric current, speed is fast, it is anti-interference preferably, can reliably issue control signal to
Operating unit and communication unit.Microprocessor is mainly responsible for sampling calculating, the reading of delay time and the relay of three-phase voltage
Control.Three-phase phase voltage obtains the AD that signal SignUa, SignUb and SignUc input microcontroller respectively after transformation
Sampling end AN0, AN1 and AN2 are sampled.
3, communication module
Communication module needs additional SIM card, GSM antenna as shown in figure 4, its selection SIM800C mould group, and the present invention uses GSM
Function of sending short messages is informed the grid-connected switch state of operation maintenance personnel, is looked into for repair personnel to operation maintenance personnel sending short message by mobile phone
It sees.
It is found by contrast test, is compared to fiber optic communication, WIFI communication isotype, gsm communication is more convenient, and energy
Target is realized well, and is researched and developed at low cost.
4, operating unit
Operating unit realizes decompression automatic trip, the function of automatic closing when voltage restores normal using motor-operating mechanism
Energy.
Operating unit uses the motor-operating mechanism of De Lixi, and low cost, stability is good, low in energy consumption, there is overcurrent protection, tries
Equal energy action message after receiving signal is tested, can satisfy the target of setting.
Operating unit of the invention has delay function, can issue divide-shut brake instruction；When voltage be higher than voltage rating 7% or
It when lower than voltage rating 10%, is delayed ten seconds, if voltage is still abnormal after ten seconds, issues separating brake instruction, voltage restores to selecting
Determine in range and (selected surely according to state's network planning), be delayed 30 seconds sending reclosing commands；Control unit real-time monitoring switch state, if
Delay is set in order to avoid switching excessively frequent movement, protects equipment.
The present invention at the separation of user and public network mainly by installing an operating unit and control switch additional, simultaneously
Voltage monitoring and control unit are set on public network, and when public network interruption maintenance, voltage monitoring unit acquires public network voltage fluctuation
Signal, and it is uploaded to control unit, the voltage of acquisition and preset threshold values compare, when exceeding threshold values, operating unit control
Separating brake is switched, public network is disconnected and is connect with photovoltaic user, communication unit is communicated with operation maintenance personnel in time, telling switch state；Work as public affairs
After net side restores electricity, operating unit control switch is closed a floodgate, and is restored public network and is connect with photovoltaic user.
It is debugged after above-mentioned each component is assembled according to the connection relationship of setting, operating voltage is directly from ammeter
Electricity is taken, the results are shown in Table 2 for system test, and movement accuracy rate (a) and switch motion test (b) histogram are as shown in Figure 5.
2 system test result of table
Intelligent low-pressure photovoltaic counnter attack power transmission monitor control system of the invention, carries out in the grid-connected project of multiple low pressure
On probation, effect is as follows:
3 system trial state of table
Target 1 is realized: when voltage is higher than voltage rating 7% or is lower than voltage rating 10%, automatically cutting off photovoltaic user
Connection between public network；When voltage is normal, the automatic connection restored between photovoltaic user and public network.
Target 2 is realized: the time that public network side determines grid-connected dotted state after having a power failure by 70 minutes before activity, shortens to 1 point
Clock can receive short massage notice, and judgment accuracy has reached 100%.
4 realization of goal situation of table
It can be seen that in conjunction with above-mentioned application data sheet lattice and actually used by nearly 3 months, intelligent low-pressure photovoltaic of the invention
Counnter attack power transmission monitor control system reaches expected in terms of intelligent control grid entry point connection status and short message inform operating personnel
Target.
Photovoltaic industry explosion type development in the case where, the distributed photovoltaic equipment of conventional support relatively lags behind, equipment without
Method reliably meets code requirement.Professional knowledge and practical work experience of the present invention are successfully produced intelligent low-pressure photovoltaic counnter attack and are sent
Pyroelectric monitor control system allows operating personnel effectively to grasp grid-connected connection of low pressure, and the development for society is played
Positive effect.Its advantage also shows as follows:
1) social resources have been saved
This activity can with the connection status of the grid-connected point of intelligent control low pressure, so that human resources be greatly saved,
And the loss of plenty of time is avoided, reduce photovoltaic user because of energy loss caused by the interruption maintenance of public network side.
2) social development is promoted
By the covering device system, the service level and service technical ability of Utilities Electric Co. have gone up a new step again, more preferably
Ground ensure that the safety and stability electricity consumption of user, reduce the time-consuming of public network side interruption maintenance, substantially improves user's photovoltaic and is sent out
The case where electricity is lost in vain in not grid-connected situation, promotes the construction of city new energy
3), the covering device can guarantee the safety of staff, and the anti-power transmission of photovoltaic is avoided to hurt sb.'s feelings；Meanwhile it greatly reducing
User is detached from the time of main power grid.
The above content is just an example and description of the concept of the present invention, affiliated those skilled in the art
It makes various modifications or additions to the described embodiments or is substituted in a similar manner, without departing from invention
Design or beyond the scope defined by this claim, be within the scope of protection of the invention.
Claims (6)
1. a kind of intelligent low-pressure photovoltaic counnter attack power transmission monitor control system, public network enters user by power supply company's metering cabinet (15)
The indoor distribution box (13) at end, indoor distribution box (13) are connected with user's internal load (14)；Photovoltaic plant and inverter
(10) it is connected by exchanging grid-connected switch (11) with user side power generation batch meter (12), photovoltaic power generation is through the metering electric energy meter that generates electricity
(121) it accesses and directly powers to user's internal load (14) in indoor distribution box (13) or convey electric energy to public network side, it is special
Sign is that the system is mainly made of operating mechanism (17) and control mechanism (16)；
Operating mechanism (17) is placed in power supply company's metering cabinet (15), for cutting off, being closed the company between public network and user side
It connects, is made of operating unit (171), motor (172) and switch (173), operating unit (171) receives divide-shut brake signal and controls
Motor (172) movement processed, the opening and closing of motor (172) control switch (173) are to realize cutting, closure public network and user side
Between connection；
Control mechanism (16) is made of voltage monitoring unit (162), control unit (163) and communication module (161), is placed in public affairs
Net side；The voltage monitoring unit (162) of control mechanism (16) and the operating unit (171) of operating mechanism (17) are connected to each other realization
The transmission of divide-shut brake signal；Voltage monitoring unit (162) to public network voltage real-time monitoring and to control unit (163) output signal,
Control unit (163) analyzes the voltage of voltage monitoring unit acquisition, and issues control signal to operating unit (171), to realize
Switch (173) open or close；Control unit (163) acquisition switch actuating signals simultaneously pass to communication module (161), communicate mould
Block (161) sends switching-state information to operation maintenance personnel immediately.
2. intelligent low-pressure photovoltaic counnter attack power transmission monitor control system as described in claim 1, which is characterized in that the control is single
Member is made of three-phase-voltage monitoring circuit and microprocessor, and three-phase-voltage monitoring circuit mainly completes three-phase phase voltage to be converted into
The voltage signal of low pressure, makes its input controller carry out AD sampling, and whether controller judges three-phase voltage according to the result of sampling
It is decompression, under-voltage, normal；The Pic16f616 single-chip microcontroller that microprocessor selects the human relations of Huzhou Thailand to produce, can reliably issue control signal
To operating unit and communication unit.
3. intelligent low-pressure photovoltaic counnter attack power transmission monitor control system as described in claim 1, which is characterized in that the operation is single
Member is delayed ten seconds when voltage is higher than voltage rating 7% or is lower than voltage rating 10%, if voltage is still abnormal after ten seconds,
Separating brake instruction is issued, voltage restores to selected range, and be delayed 30 seconds sending reclosing commands.
4. intelligent low-pressure photovoltaic counnter attack power transmission monitor control system as described in claim 1, which is characterized in that when public network has a power failure
When maintenance, voltage monitoring unit acquires public network voltage fluctuation signal, and is uploaded to control unit, the voltage of acquisition with preset
Threshold values comparison, exceed threshold values when, operating unit control switch separating brake, disconnect public network connect with photovoltaic user, communication unit and
When with operation maintenance personnel communicate, telling switch state；After public network side restores electricity, operating unit control switch is closed a floodgate, and restores public
Net is connect with photovoltaic user.
5. intelligent low-pressure photovoltaic counnter attack power transmission monitor control system as described in claim 1, which is characterized in that when public network route
When the interruption maintenance of side, the connection between grid-connected user and public network can be cut off in time, and operation maintenance personnel in time, can be obtained accurately
Know the connection status between grid-connected user and public network.
6. intelligent low-pressure photovoltaic counnter attack power transmission monitor control system as described in any one in claim 1-5, which is characterized in that logical
Cross at the separation of user and public network installation one operating unit and control switch, at the same be arranged on public network voltage monitoring and
Control unit, when public network interruption maintenance, voltage monitoring unit acquires public network voltage fluctuation signal, and is uploaded to control unit,
The voltage of acquisition and preset threshold values compare, and when exceeding threshold values, operating unit control switch separating brake disconnects public network and photovoltaic
User's connection, communication unit are communicated with operation maintenance personnel in time, telling switch state；After public network side restores electricity, operating unit
Control switch is closed a floodgate, and is restored public network and is connect with photovoltaic user.
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