CN106549411A - Distributed power source grid-connecting apparatus - Google Patents
Distributed power source grid-connecting apparatus Download PDFInfo
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- CN106549411A CN106549411A CN201610841855.6A CN201610841855A CN106549411A CN 106549411 A CN106549411 A CN 106549411A CN 201610841855 A CN201610841855 A CN 201610841855A CN 106549411 A CN106549411 A CN 106549411A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention provides a kind of distributed power source grid-connecting apparatus, including：Electric energy quality monitoring and metering module, including sampling unit and measurement processor, the sampling unit are used for current signal, the voltage signal for obtaining the output of distributed electrical source inventer, and the current signal includes alternating current component and direct-current component；The measurement processor carries out real-time power quality analysis, and exports power quality analysis result for the current signal that obtained according to the sampling unit, voltage signal；Primary processor, the power quality analysis result for being exported according to the measurement processor export corresponding control signal；Performing module, for according to the control signal carry out corresponding action so that distributed power source to be connected with public electric wire net, or disjunction distributed power source and public electric wire net connection.The device can find the unqualified just excision in time of the quality of power supply, to ensure user power utilization safety and power quality with the electric energy of the grid-connected distributed electrical source inventer output of real-time monitoring.
Description
Technical field
The present invention relates to interconnection technology field, and in particular to a kind of distributed power source grid-connecting apparatus.
Background technology
In December, 2012, the self-built distributed photovoltaic power generation system (low pressure distributed power source) of country the first resident is in Qingdao City
Be incorporated into the power networks, open the new page of China distributed power source development, with a series of national encouragement policies appearance and can be again
The development of raw New Type of Energy generation technology, distributed power source solve load growth demand by day by day becoming and meet national promotion again
The ideal scheme of environmental protection theory.Distributed power source is connected with public electric wire net so that especially distribution system becomes for power system
Obtain and more disperse, dependence of the user to big power station and transmission line of electricity will be reduced, and substantially increase the stability of power system
And motility.
But distributed power source there is also the pollution quality of power supply, the safety for affecting original power distribution network Operation of Electric Systems and can
Access by property, i.e. distributed power source and power distribution network relay protection can be had a negative impact.Country's inverter class low pressure distribution at present
Formula power grid typically realizes the connection with public electric wire net, electric energy quality monitoring by the protection of user's inverter, control function
Analysis is carried out in grid side with metering, and electric energy quality monitoring analysis is essentially analysis or periodic monitoring analysis under line.Therefore, exist
During distributed power source output current voltage influence public power quality, it is impossible to cut off to ensure the public electric wire net quality of power supply in time,
And can not be in time by the connection of the distributed power source and public electric wire net making full use of point when distributed power source output electric energy is qualified
The electric energy of cloth power supply.
The content of the invention
Therefore, the technical problem to be solved in the present invention be existing distributed power source it is grid-connected can not its export the quality of power supply
The connection with public electric wire net is disconnected when unqualified, therefore is easily caused the decline of the public electric wire net quality of power supply.
For this purpose, embodiments providing following technical scheme：
A kind of distributed power source grid-connecting apparatus, including：
Electric energy quality monitoring and metering module, including sampling unit and measurement processor, the sampling unit are used to obtain
The current signal of distributed electrical source inventer output, voltage signal, the current signal include alternating current component and unidirectional current
Flow component；The measurement processor carries out real-time electric energy for the current signal that obtains according to the sampling unit, voltage signal
Quality analysiss, and export power quality analysis result；
Primary processor, the corresponding control letter of the power quality analysis result output for being exported according to the measurement processor
Number；
Performing module, for carrying out corresponding action to connect distributed power source with public electric wire net according to the control signal
Connect, or disjunction distributed power source and public electric wire net connection.
Alternatively, the sampling unit includes sample circuit, analog signal conditioner circuit and A/D convertor circuit, the sampling
Circuit is used to gather three-phase current signal and three-phase voltage signal, and the analog signal conditioner circuit is for the sample circuit
The analog electrical signal for collecting is filtered and processing and amplifying, the A/D convertor circuit for the current signal after will be conditioned and
Voltage signal is converted to digital signal, and is input into the measurement processor.
Alternatively, also including communication module, the communication module includes RS485 communication interfaces, for single from the sampling
Unit obtains the voltage signal and current signal of the distributed electrical source inventer output and is uploaded to the primary processor；It is described
Communication module also includes radio communication unit, for being connected to upload the distributed power source grid-connecting apparatus collection with higher level main website
Data, calculated data and the current status data for arriving；The communication module also includes the ether gone out by usb expansion
Network interface, for transferring data to local backstage storage.
Alternatively, also including data memory module, for storing the quality of power supply when power quality analysis result is unqualified
Statistical data and power quality analysis result.
Alternatively, also including record ripple module, for catching waveform shape when each power quality index surmounts pre-set limit
Into wave file, the wave file is carried out locally stored by the measurement processor, or is transferred to locally by Ethernet
Backstage is stored.
Alternatively, also including power supply, the input of the power supply is connected with AC network, and output two-way is straight
Stream, wherein voltage is 5V all the way, another road voltage is 15V；
Also include modular power source, the input of the modular power source is connected with the outfan of the power supply, the mould
Block power supply includes DC-DC conversion circuit, for the 15V voltage transformations that export the power supply to 5.2V with to the electric energy
Quality-monitoring is powered with metering module；
Also include power control circuit, be arranged between the primary processor and the modular power source, for according to described
The control signal shut-off of primary processor output turns on the modular power source to the confession of the electric energy quality monitoring and metering module
Electrical circuit；
Also include power distribution circuit, the input of the power distribution circuit is connected with the outfan of the modular power source
Connect, for 5.2V voltages that the modular power source is exported by power conversion chip generate respectively+1.2V ,+3.3V ,+2.5V,
+5V、-5V；
The device also includes energy-storage battery or the accumulator being made up of farad capacitor, for during AC network power-off
Power for the device, to ensure the storage of device internal information.
Alternatively, also including relay protection module, receive the control signal of the primary processor output, for excessively stream,
The connection of the distributed power source and electrical network is disconnected when short-circuit, under-voltage.
Alternatively, also including free-standing electric energy metering module, for obtaining the three-phase voltage of grid entry point, three-phase current, having
Work(power, reactive power, power factor (PF) and electricity.
Alternatively, also including man-machine module, the man-machine module includes Chinese display unit and keyboard, and the Chinese display unit is used for
Carry out local data and show and alert display, the Chinese display unit includes LCDs, diode backlight and backlight control electricity
Road；The keyboard includes 7 buttons, for parameter setting.
Technical solution of the present invention, has the advantage that：
1. distributed power source grid-connecting apparatus provided in an embodiment of the present invention, can be with the grid-connected distributed power source inversion of real-time monitoring
The electric energy output of device, finds the unqualified index of the quality of power supply in time, and is arranged to causing the distributed of electric energy pollution according to definite value
Power supply is cut off in time, ensures periphery user power utilization safety and power quality.
2. distributed power source grid-connecting apparatus provided in an embodiment of the present invention, using dual processor (CPU), wherein measurement processing
, for electric energy quality monitoring and metering, primary processor (ARM) is for data management and communication for device (DSP).Measurement processor (DSP)
Data and event can be passed to primary processor (ARM) by serial ports, further be counted and processed by primary processor (ARM),
And make the process such as alarm, grid-connected off-network on-off control.Function allocation rationally, gives full play to the advantage of each platform.
Description of the drawings
In order to be illustrated more clearly that the specific embodiment of the invention or technical scheme of the prior art, below will be to concrete
Needed for embodiment or description of the prior art, accompanying drawing to be used is briefly described, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is the structural representation of distributed power source grid-connecting apparatus in the embodiment of the present invention；
Fig. 2 is the relation schematic diagram in the embodiment of the present invention between distributed power source grid-connecting apparatus and grid-connected switch；
Fig. 3 is logical judgment schematic diagram in the embodiment of the present invention；
Fig. 4 is bi-processor architecture schematic diagram in the embodiment of the present invention；
Fig. 5 is primary processor and its peripheral circuit schematic diagram in the embodiment of the present invention；
Fig. 6 interacts schematic diagram for the part signal in the embodiment of the present invention between measurement processor and primary processor.
Specific embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described enforcement
Example is a part of embodiment of the invention, rather than the embodiment of whole.Based on the embodiment in the present invention, ordinary skill
The every other embodiment obtained under the premise of creative work is not made by personnel, belongs to the scope of protection of the invention.
As long as additionally, the non-structure each other of technical characteristic involved in invention described below different embodiments
Can just be combined with each other into conflict.
Embodiment 1
A kind of distributed power source grid-connecting apparatus are present embodiments provided, as shown in figures 1 to 6, including：
Electric energy quality monitoring and metering module, including sampling unit 11 and measurement processor 12, sampling unit 11 are used to obtain
Current signal, the voltage signal of the output of distributed electrical source inventer are taken, current signal includes alternating current component and DC current
Component.Most of distributed power sources, such as can feed inversion DC component out to electrical network when photo-voltaic power supply is grid-connected, therefore directly
Flow component is a grid-connected important performance indexes, it is necessary to detected, to ensure that electrical network normally can run.Measurement processor
(DSP) real-time power quality analysis are carried out, and exports electric energy matter for the current signal that obtained according to sampling unit, voltage signal
Amount analysis result.Measurement processor (DSP) can be also used for electricity volume metering and carry out failure based on power quality analysis
Judge, and data and event are passed to into primary processor 2 (ARM) by serial ports, further united by primary processor 2 (ARM)
Meter and process, and make the process such as alarm, grid-connected off-network on-off control.Measurement processor 12 (DSP) is using TI's
TMS320C6747, dominant frequency is up to 300MHz.
Specifically, above-mentioned sampling unit 11 includes sample circuit, analog signal conditioner circuit and A/D convertor circuit, sampling electricity
Road is used to gather ABC three-phase current signals and ABC three-phase voltage signals, and analog signal conditioner circuit is for gathering to sample circuit
To analog electrical signal be filtered with size adjustment etc., A/D convertor circuit is for by the current signal and electricity Jing after signal condition
Pressure signal is converted to digital signal, and input measurement processor 12.Wherein, alternating current component is gathered using current transformer
(CT), direct-current component can utilize Hall element or manganese copper diverter to gather, and voltage signal sampling utilizes mutual induction of voltage
Device (PT), and the sampling resistor of different resistances is selected as needed.The sampling module also includes digital data acquisition, outer for gathering
The digital quantities such as portion's make and break contact, as shown in Fig. 2 the switching value of concrete collection includes the grid-connected position of the switch and grid-connected switch trip letter
Number.
The content analyzed by above-mentioned power quality analysis is according to national regulation (equipment for monitoring power quality national standard
GB19862 required index in), including current/voltage fundamental wave, voltage x current harmonic wave, zero-sequence current, negative-sequence current, electric current be straight
Flow component, reactive balance degree, voltage x current degree of unbalancedness, voltage pulsation, voltage flicker, voltage deviation, frequency departure and voltage
Temporarily liter, temporary drop and short interruptions detection etc..The whether qualified meansigma methodss per minute by corresponding index of index are compared with limit value, are exceeded
It is judged to unqualified during limits, each index limits are arranged as required to.
Primary processor 2, the corresponding control letter of the power quality analysis result output for being exported according to measurement processor 12
Number.Primary processor carries out logical judgment based on power quality analysis result, and corresponding according to the output of logical judgment result
Control signal.AT91SAM9260 chip of the primary processor 2 (ARM) using Atmel companies, rich interface, management function are powerful.
As shown in figure 3, specific decision logic can be：When distributed power source is in grid-connected state, if grid-connected
Point power quality index occur it is unqualified and exceed warning value and continue default time (t1) after, output control alarm control
Signal；Exceed after power quality index continues to deteriorate working value or the quality of power supply continue unqualified (working value=warning value) and
Continue default time (t2, t2>T1 after), then send pressure and disconnect control signal.Afterwards, continue power quality analysis, work as electricity
After energy quality recovers normal and lasting default time (t3), export cutting-in control signal and alert signal of removing controls.
Performing module, for according to control signal carry out corresponding action so that distributed power source to be connected with public electric wire net,
Or the connection of disjunction distributed power source and public electric wire net.Specifically disconnecting control signal disjunction distributed power source according to pressure
With the connection of electrical network, according to the connection of cutting-in control signal conduction distributed power source and electrical network.That is, the performing module at least includes
Two groups of controlled output contacts, are exported for separating brake for output of closing a floodgate, another road all the way.
In addition, performing module also includes Alarm Unit, the Alarm Unit can be according to the alarm control of primary processor output
Signal sends warning information.Alarm mode is alerted for display lamp, and produces internal alarm remote signalling.Need having for alarm：Device is different
Often total alarm, communication abnormality, storage exception, the alarm of all kinds of protection acts, relay protection module, device exchange dead electricity.
As shown in figure 4, the device adopts dual processor (CPU), wherein measurement processor (DSP) is for electric energy quality monitoring
With metering, primary processor (ARM) is for data management and communication.Data and event can be passed by measurement processor (DSP) by serial ports
Primary processor (ARM) is given, is further counted and is processed by primary processor (ARM), and make alarm, grid-connected off-network switch
Control etc. is processed.Function allocation rationally, gives full play to the advantage of each platform.
The distributed power source grid-connecting apparatus that the present embodiment is provided, can be with the electricity of the grid-connected distributed electrical source inventer of real-time monitoring
Can output, find in time the unqualified index of the quality of power supply, and according to definite value arrange to cause electric energy pollution distributed power source and
When cut off, ensure periphery user power utilization safety and power quality.
As specific embodiment, as shown in figure 5, the distributed power source grid-connecting apparatus also include communication module, communication
Module includes at least three road RS485 communication interfaces, is wire communication, wherein being used for all the way obtaining the output of distributed electrical source inventer
Voltage signal and current signal be uploaded to primary processor, using MODBUS agreements；Can count with independent type electric on wherein another road
Amount module (multifunctional electric energy meter) connection, for gathering electric energy meter data, using DL/T645-2007 communications protocol；3rd tunnel
RS485 communication interfaces are connected to transmit various data and parameter with external control display screen, or are connected with direct current case, are used for
Copy DC detecting table data.
Communication module also includes GPRS radio communication units, is connected with higher level main website using built-in SIM Jing wireless networks.
Support that TCP and two kinds of communication modes of UDP, communication mode are set by main website, be defaulted as TCP modes；Under TCP communication mode, eventually
During after the initialization of end and to heart beat cycle (no signal monitoring passage normal), actively with main website heart beating 3 times, if unsuccessful under
No longer active heartbeat before one heart beat cycle；Heart beat cycle is arranged by main website.The radio communication unit is distributed for uploading
Data, calculated data and current status data that power grid device is collected, specifically include：Low pressure distributed electrical
Source net state (position of the switch), inverter state；The remote measurement amount such as grid-connected point voltage, electric current, power, power factor, low pressure point
The active and idle output of cloth power supply, generated energy；Unit protection action, each module warning signal, power quality index statistic
Remote signalling amounts such as (24 hours be unit), and the remote signalling amount such as points of common connection, the on off state of grid-connected point breaker.In addition, should
The wireless communication unit of communication module can also be cdma wireless communication module or gsm wireless communication module or 3G communication modules.
Communication module also includes ethernet communication unit, and measurement processor (DSP) can go out Ethernet using usb expansion and connect
Mouthful, recorded wave file is transferred to by local backstage by the Ethernet interface then and is reappeared and is stored.In addition, communication module is also
Including RS232 maintenance serial ports.
The present embodiment is started with according to the characteristics of distributed power source in terms of hardware compatibility, secrecy setting, cost control etc.,
For distributed power source grid-connecting apparatus configuration utility rationally, and meet the communication system of development trend, be low pressure distributed power source simultaneously
Net device docks ready with dispatch automated system.
As specific embodiment, as shown in figure 5, the device also includes data memory module, for working as the quality of power supply
Quality of power supply statistical data and power quality analysis result are stored when analysis result is unqualified.In addition, the data memory module is also
For storing the protection event of relay protection module, at least 50 are stored；It is additionally operable to store the phase of free-standing electric energy metering module
Close data, such as it is each mutually lose, it is disconnected mutually press number of times, decompression is broken equal generation moment, finish time and corresponding electric energy data etc.
Information；And decompression, disconnected phase, game clock lid should be supported, the critical events such as end button cover record active reporting is opened.And to quality of power supply day
Statistical data is stored, including power quality data and the maximum, minimum of DC component, the day statistics of meansigma methodss.
The data of above-mentioned storage, especially protect logout and power quality analysis result etc. take by USB interface
Go out or (main website) is uploaded by Ethernet, export adopts CSV format, power quality data adopts PQDIF forms, be easy to use
Family is checked on PC.
In addition, for some field conditions of good reaction profile formula power grid, needing out-of-limit event to occur
Waveform capture to and stored, so that backstage carries out case study and research.Therefore, the device also has record ripple module, uses
In the waveform caught when each power quality index surmounts pre-set limit and form wave file.The transient fault time typically continues several
Second or tens seconds, corresponding recorded wave file just has hundreds of K or M byte, is not suitable for by primary processor (ARM) teletransmission to electric power
Office, data transfer are costly.Although primary processor (ARM) is administrative unit, wave file transfers to measurement processor
(DSP) it is locally stored to carry out, and it is proper to the preservation of local backstage to pass through Ethernet or WIFI local transmissions.
Used as specific embodiment, the device also includes power supply, and input and the AC network of power supply connect
Connect, export two-way direct current, wherein voltage is 5V all the way, another road voltage is 15V；Power supply include overvoltage crowbar and
EMC filter circuit.The power supply can be powered using three-phase 400V, and any phase power down does not affect device to power.In addition, relay
The direct-current working volts of device box protection device should ensure that the reliable work under the conditions of external power source is 80%～115% rated voltage
Make, ripple coefficient of voltage is not more than 2%, warning information should be sent during device power-off.
Also include modular power source, the input of modular power source is connected with the outfan of power supply, and modular power source includes DC-
DC translation circuits, for the 15V voltage transformations that export power supply to 5.2V supplying with metering module to electric energy quality monitoring
Electricity.
Also include power control circuit, be arranged between primary processor and modular power source, for being exported according to primary processor
Control signal shut-off or conduction module power supply to electric energy quality monitoring and metering module current supply circuit.Work as electric energy quality monitoring
With metering module break down deadlock when, primary processor can be by way of modular power source shut-off be opened again resetting
Electric energy quality monitoring and metering module, enable electric energy quality monitoring to recover normal work with metering module.As shown in fig. 6, module
The break-make of power supply is realized by the on or off state of control electrical switch by primary processor.
Also include power distribution circuit, the input of power distribution circuit is connected with the outfan of modular power source, for inciting somebody to action
The 5.2V voltages of modular power source output generate+1.2V ,+3.3V ,+2.5V ,+5V, -5V respectively by power conversion chip, wherein,
+ 3.3V ,+2.5V ,+5V, -5V power to analog signal conditioner circuit and A/D convertor circuit, and+3.3V and+1.2V are to measurement processing
Device and other peripheral circuits are powered.
The device also includes energy-storage battery or the accumulator being made up of farad capacitor, for during AC network power-off
Power for the device, to ensure the storage of device internal information.
Although distributed electrical source inventer typically all has more complete protection system, in order to ensure to protect in inverter
The system failure can be cut off in time when shield failure or unexpected abjection operation, ensure public electric wire net safe and stable operation, the present embodiment
The distributed power source grid-connecting apparatus of offer also include relay protection module, receive primary processor output control signal, for
Excessively stream, short circuit, it is under-voltage when disconnect the connection of distributed power source and electrical network.Specifically, the present embodiment can with raising from cost control
Set out in terms of by property two, relay protection function is realized using Schneider NSX100F switches, it is simple and reliable, adjust conveniently.
Distributed power source grid-connecting apparatus, also including free-standing metering module, for obtaining three-phase voltage, the three-phase of grid entry point
Electric current, active power, reactive power, power factor (PF) and electricity, these data can be transferred to survey by RS485 communication interfaces
Amount processor or primary processor.These data electric energy quality monitorings have been also carried out calculating with metering module, it is possible to by matching somebody with somebody
Put selection data source.Specifically, free-standing metering module can be built-in electric energy meter.
Used as optional embodiment, the distributed power source grid-connecting apparatus also include man-machine module, and man-machine module includes the Chinese
Aobvious unit, shows and alerts display for carrying out local data, and local data includes communications parameter, no-load voltage ratio, the mode of connection, specified
Value and limit value.
Chinese display display unit includes 160 × 160 dot matrix single colour liquid crystal displays, diode backlight and backlight control circuit；
Man-machine module also includes keyboard, 7 buttons：Upper shifting, move down, move to left, moving to right, cancelling, confirming, programming.
The distributed power source grid-connecting apparatus are provided with Chinese display liquid crystal display screen, short and sweet, meet operational requirements.
Obviously, above-described embodiment is only intended to clearly illustrate example, and the not restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description other multi-forms change or
Change.There is no need to be exhaustive to all of embodiment.And thus it is extended obvious change or
Among changing still in the protection domain of the invention.
Claims (9)
1. a kind of distributed power source grid-connecting apparatus, it is characterised in that include：
Electric energy quality monitoring and metering module, including sampling unit and measurement processor, the sampling unit are used to obtain distribution
The current signal of formula power inverter output, voltage signal, the current signal include alternating current component and unidirectional current flow point
Amount；The measurement processor carries out the real-time quality of power supply for the current signal that obtains according to the sampling unit, voltage signal
Analysis, and export power quality analysis result；
Primary processor, the power quality analysis result for being exported according to the measurement processor export corresponding control signal；
Performing module, for according to the control signal carry out corresponding action so that distributed power source to be connected with public electric wire net,
Or the connection of disjunction distributed power source and public electric wire net.
2. distributed power source grid-connecting apparatus according to claim 1, it is characterised in that the sampling unit includes sampling electricity
Road, analog signal conditioner circuit and A/D convertor circuit, the sample circuit are used to gather three-phase current signal and three-phase voltage letter
Number, the analog signal conditioner circuit for the analog electrical signal that the sample circuit is collected is filtered and amplification at
Reason, the A/D convertor circuit are converted to digital signal for the current signal and voltage signal after will be conditioned, and are input into described
Measurement processor.
3. distributed power source grid-connecting apparatus according to claim 1, it is characterised in that also including communication module are described logical
Letter module includes RS485 communication interfaces, for the voltage of the distributed electrical source inventer output is obtained from the sampling unit
Signal and current signal are simultaneously uploaded to the primary processor；The communication module also include radio communication unit, for higher level
Main website connects to upload data, calculated data and the current state number that the distributed power source grid-connecting apparatus are collected
According to；The communication module also includes the Ethernet interface gone out by usb expansion, for transferring data to local backstage storage.
4. distributed power source grid-connecting apparatus according to any one of claim 1-3, it is characterised in that also deposit including data
Storage module, for quality of power supply statistical data and power quality analysis result are stored when power quality analysis result is unqualified.
5. distributed power source grid-connecting apparatus according to any one of claim 1-4, it is characterised in that also including record ripple mould
Block, for the waveform that catches when each power quality index surmounts pre-set limit and forms wave file, and the wave file is by institute
It is locally stored to carry out to state measurement processor, or is transferred to local backstage by Ethernet and is stored.
6. distributed power source grid-connecting apparatus according to claim 1, it is characterised in that also including power supply, the confession
The input of power supply is connected with AC network, exports two-way direct current, wherein voltage is 5V all the way, another road voltage is 15V；
Also include modular power source, the input of the modular power source is connected with the outfan of the power supply, the module electricity
Source includes DC-DC conversion circuit, for the 15V voltage transformations that export the power supply to 5.2V with to the quality of power supply
Monitoring is powered with metering module；
Also include power control circuit, be arranged between the primary processor and the modular power source, for according to the main place
The control signal shut-off of reason device output turns on power supply time of the modular power source to the electric energy quality monitoring and metering module
Road；
Also include power distribution circuit, the input of the power distribution circuit is connected with the outfan of the modular power source, is used
In the 5.2V voltages that the modular power source is exported by power conversion chip generate respectively+1.2V ,+3.3V ,+2.5V ,+5V ,-
5V；
The device also includes energy-storage battery or the accumulator that is made up of farad capacitor, for during AC network power-off for should
Device is powered, to ensure the storage of device internal information.
7. distributed power source grid-connecting apparatus according to claim 1, it is characterised in that also including relay protection module, connect
Receive the control signal of primary processor output, for excessively stream, short circuit, it is under-voltage when disconnect the distributed power source and electrical network
Connection.
8. distributed power source grid-connecting apparatus according to claim 1, it is characterised in that also including free-standing electric energy metrical mould
Block, for obtaining three-phase voltage, three-phase current, active power, reactive power, power factor (PF) and the electricity of grid entry point.
9. distributed power source grid-connecting apparatus according to claim 1, it is characterised in that also including man-machine module, the people
Machine module includes Chinese display unit and keyboard, and the Chinese display unit shows and alert display, the Chinese display for carrying out local data
Unit includes LCDs, diode backlight and backlight control circuit；The keyboard includes 7 buttons, for parameter setting.
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| CN108169604A (en) * | 2018-01-30 | 2018-06-15 | 上海君世电气科技有限公司 | Distributed generation resource electricity generation grid-connecting safety monitoring method and monitoring system |
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| CN109557393A (en) * | 2018-11-28 | 2019-04-02 | 南京康尼电气技术有限公司 | A kind of novel micro-capacitance sensor switchover operation experiment porch and experimental method |
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| CN114123139B (en) * | 2021-11-29 | 2024-02-13 | 许继集团有限公司 | Failure protection method and device suitable for high-resistance faults |
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