CN109802432A - A kind of anti-reverse flow control device of photovoltaic plant and its control method - Google Patents
A kind of anti-reverse flow control device of photovoltaic plant and its control method Download PDFInfo
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- CN109802432A CN109802432A CN201910008358.1A CN201910008358A CN109802432A CN 109802432 A CN109802432 A CN 109802432A CN 201910008358 A CN201910008358 A CN 201910008358A CN 109802432 A CN109802432 A CN 109802432A
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to counterflow-preventing control technology fields, more particularly to a kind of anti-reverse flow control device of photovoltaic plant, the anti-reverse flow control device of photovoltaic plant includes inverter, battery, converter and control unit, the photovoltaic generating system is connect with local load and power grid respectively by inverter, the control unit includes measurement module, processor, remote signal module and control module, control point 1 is provided between the output end of the photovoltaic generating system and the input terminal of inverter, control point 4 is provided between the output end of the photovoltaic generating system and the input terminal of battery, measurement point is provided between the output end and power grid of the inverter, and control point 2 is provided between the output end and measurement point of inverter, in this control equipment use process, electric energy can effectively be recycled, and it is capable of the period of expansion instrument operating, it is convenient The use of device.
Description
Technical field
The present invention relates to counterflow-preventing control technology field more particularly to a kind of anti-reverse flow control device of photovoltaic plant and its controls
Method processed.
Background technique
It is load supplying that photovoltaic plant is grid-connected together with ac grid system.On the one hand power supply department is needed to guarantee power supply matter
Amount and reliability, while photovoltaic plant being enable to work normally, give full play to the economic benefit and exemplary role of clean energy resource.It is another
Aspect, the operation of photovoltaic plant cannot influence the safety of ac grid system, do not allow photovoltaic plant by distribution transformer to
Power transmission is fallen in electric system, while most scientific reasonable employment photovoltaic plant is powered, and reduces user power utilization cost.Therefore, it is necessary to light
Overhead utility carries out security control.
State Grid Corporation of China requires, when photovoltaic generating system is designed as irreversible synchronizing mode, when detecting adverse current power
More than rated output 5% when, photovoltaic generating system should stop in 0.5s-2s to power network line power transmission.
Existing operating method is: by the electric current and voltage of anti-backflow device real-time monitoring distribution transformer side, working as inspection
When having measured adverse current power, then the connection of photo-voltaic power supply and power grid is disconnected, or by certain algorithm, so that photovoltaic DC-to-AC converter
Reduce output power.After the connection between photo-voltaic power supply and power grid disconnects, it will lead to the waste of energy on photo-voltaic power supply, cause
The loss of the energy.
Summary of the invention
The purpose of the present invention is to solve a kind of photovoltaic electrics that energy dissipation exists in the prior art, and proposes
It stands anti-reverse flow control device and its control method.
To achieve the goals above, present invention employs following technical solutions:
A kind of anti-reverse flow control device of photovoltaic plant, the anti-reverse flow control device of photovoltaic plant include inverter, battery, turn
Parallel operation and control unit, the photovoltaic generating system are connect with local load and power grid respectively by inverter, the control unit
Including measurement module, processor, remote signal module and control module, the output end of the photovoltaic generating system and inverter it is defeated
Enter and be provided with control point 1 between end, control is provided between the output end of the photovoltaic generating system and the input terminal of battery
Point 4, is provided with measurement point, and be arranged between the output end and measurement point of inverter between the output end and power grid of the inverter
There is control point 2, the input terminal of the converter is between the control point 2 and the measurement point, and the input terminal of converter
It is provided with control point 3, and the output end of converter is connected with the input terminal of the battery, the output end of the battery
Control point 5 is provided between the input terminal of inverter；
Preferably, the output end of the control module respectively with the control point 1, the control point 2, the control point 3,
The control point 4 is connected with the control point 5, and the processor is connected with the input terminal of the control module, described distant
Believe module input terminal respectively with the control point 1, the control point 2, the control point 3, the control point 4 and the control
Point 5 is connected, and the output end of the remote signal module is connected with the input terminal of the processor, the processor and the measurement
Module is connected, and the input terminal of measurement module is connected with the measurement point.
Preferably, the measurement module includes voltage transformer and current transformer, and the measurement module is surveyed for detecting
Measure the voltage of point, the size of electric current and direction.
Preferably, at the control point 1, the control point 2, the control point 3, the control point 4 and the control point 5
It is separately installed with relay.
Preferably, the remote signal module is used for the switch state of control relay.
Preferably, the control module for changing relay switch state.
Preferably, the control method of the anti-reverse flow control device of a kind of photovoltaic plant, comprising the following steps:
S1: measurement point voltage, the size of electric current and direction are detected by measurement module, and are transferred to processor, is passed through
Processor controls control module, and is closed the relay at control point 1 and control point 2；
S2: when there is adverse current power, but when adverse current power is less than the 5% of rated output, pass through control module closure control
A part of alternating current can be converted into direct current and stored to battery by the relay at system point 3, converter；
When there is adverse current power, but when adverse current power is greater than or equal to the 5% of rated output, disconnected by control module
Relay at control point 1, while the relay at control point 4 is closed by control module；
When photovoltaic generating system does not work, the relay at control point 5 is closed by control module, internal storage battery
Electric current is converted into alternating current by inverter.
Preferably, in the S2, there is adverse current power, but when adverse current power is greater than or equal to the 5% of rated output, lead to
The relay at control module disconnection control point 1 is crossed, while the relay at control point 4 is closed by control module, and be closed
The electric current of internal storage battery is converted into alternating current by inverter by the relay at control point 5.
Preferably, in the S2, when photovoltaic generating system does not work, the relay at control point 5 is closed by control module
The electric current of device, internal storage battery is converted into alternating current by inverter, when measurement point detects adverse current power, by controlling mould
Block disconnects the relay at control point 5.
Preferably, in the S2, there is adverse current power, but when adverse current power is greater than or equal to the 5% of rated output, lead to
The relay at control module disconnection control point 1 is crossed, while the relay at control point 4 is closed by control module, works as electric power storage
When pond electricity approaches saturation, pass through the relay at control module disconnection control point 4.
The beneficial effects of the present invention are:
It 1,, can when there is adverse current power in the anti-reverse flow control device use process of photovoltaic plant proposed by the present invention
It is reasonably recycled by the electric energy in battery, when photovoltaic generating system does not work, the electric energy and energy of internal storage battery
It is outwardly discharged, for the local power supply loaded with power grid.
2, in device use process, when there is adverse current power, and when adverse current power is larger, photovoltaic generating system is disconnected at this time
Relay between inverter is disconnected, and can enable a device to continue work by battery to inverter power supply at this time
Make, improves the scope of application of device.
In conclusion can effectively recycle electric energy, and be capable of expansion instrument operating in this control equipment use process
Period facilitates the use of device.
Detailed description of the invention
Fig. 1 is a kind of schematic illustration of the anti-reverse flow control device of photovoltaic plant proposed by the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
Referring to Fig.1, the anti-reverse flow control device of a kind of photovoltaic plant, the anti-reverse flow control device of photovoltaic plant include inverter,
Battery, converter and control unit, the photovoltaic generating system are connect respectively with local load and power grid by inverter, are turned
Parallel operation includes measurement module, processor, remote signal module and control mould for converting alternating current to direct current, the control unit
Block, processor are the processor based on ARM, are provided between the output end of the photovoltaic generating system and the input terminal of inverter
Control point 1 is provided with control point 4, the inverter between the output end of the photovoltaic generating system and the input terminal of battery
Output end and power grid between be provided with measurement point, and control point 2 is provided between the output end and measurement point of inverter, it is described
The input terminal of converter is between the control point 2 and the measurement point, and the input terminal of converter is provided with control point 3,
And the output end of converter is connected with the input terminal of the battery, the input of the output end and inverter of the battery
Control point 5 is provided between end, local load is between inverter and control point 2；
The output end of the control module respectively with the control point 1, the control point 2, the control point 3, the control
System point 4 is connected with the control point 5, and the processor is connected with the input terminal of the control module, the remote signal module
Input terminal respectively with the control point 1, the control point 2,5 phase of the control point 3, the control point 4 and the control point
Connection, the output end of the remote signal module are connected with the input terminal of the processor, the processor and the measurement module
It is connected, and the input terminal of measurement module is connected with the measurement point.
Further, measurement module includes voltage transformer and current transformer, and the measurement module is for detecting measurement
The voltage of point, the size of electric current and direction.
Further, control point 1, the control point 2, the control point 3, the control point 4 and the control point 5 are punished
Relay is not installed.
Further, remote signal module is used for the switch state of control relay.
Further, control module for changing relay switch state.
Further, the control method of the anti-reverse flow control device of a kind of photovoltaic plant, comprising the following steps:
S1: measurement point voltage, the size of electric current and direction are detected by measurement module, and are transferred to processor, is passed through
Processor controls control module, and is closed the relay at control point 1 and control point 2；
S2: when there is adverse current power, but when adverse current power is less than the 5% of rated output, pass through control module closure control
A part of alternating current can be converted into direct current and stored to battery by the relay at system point 3, converter；
When there is adverse current power, but when adverse current power is greater than or equal to the 5% of rated output, disconnected by control module
Relay at control point 1, while the relay at control point 4 is closed by control module；
When photovoltaic generating system does not work, the relay at control point 5 is closed by control module, internal storage battery
Electric current is converted into alternating current by inverter.
Further, in S2, there is adverse current power, but when adverse current power is greater than or equal to the 5% of rated output, pass through
Control module disconnects the relay at control point 1, while being closed the relay at control point 4 by control module, and be closed control
Relay at system point 5, is converted into alternating current by inverter for the electric current of internal storage battery.
Further, in S2, when photovoltaic generating system does not work, the relay at control point 5 is closed by control module,
The electric current of internal storage battery is converted into alternating current by inverter, when measurement point detects adverse current power, passes through control module
Disconnect the relay at control point 5.
In the S2, there is adverse current power, but when adverse current power is greater than or equal to the 5% of rated output, passes through control
Module disconnects the relay at control point 1, while being closed the relay at control point 4 by control module, works as accumulator electric-quantity
Close to when being saturated, the relay at control point 4 is disconnected by control module, prevents battery from overshooting.
In the present embodiment, in the anti-reverse flow control device use process of photovoltaic plant proposed by the present invention, when there is adverse current function
When rate, can reasonably it be recycled by the electric energy in battery, when photovoltaic generating system does not work, internal storage battery
Electric energy can outwardly be discharged again, be loaded and the power supply of power grid for local, in device use process, when there is adverse current function
Rate, and when adverse current power is larger, the relay disconnected between photovoltaic generating system and inverter at this time is disconnected, and can be led at this time
Battery is crossed to inverter power supply, enables a device to work on, improves the scope of application of device.
In device use process, when not occurring adverse current power, but when voltage or current is lower, storage can be passed through at this time
Battery improves the output power of inverter to inverter power supply.
In device use process, after adverse current power disappears, the relay at control point 1 and control point 2 is re-closed, together
When disconnect relay at control point 4 and control point 5, device can be operated normally.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (9)
1. a kind of anti-reverse flow control device of photovoltaic plant, the anti-reverse flow control device of photovoltaic plant include inverter, battery, conversion
Device and control unit, the photovoltaic generating system are connect with local load and power grid respectively by inverter, which is characterized in that,
The control unit includes measurement module, processor, remote signal module and control module, the output end of the photovoltaic generating system with
Control point 1 is provided between the input terminal of inverter, between the output end of the photovoltaic generating system and the input terminal of battery
It is provided with control point 4, measurement point, and the output end of inverter and measurement are provided between the output end and power grid of the inverter
It is provided with control point 2 between point, the input terminal of the converter is converted between the control point 2 and the measurement point
The input terminal of device is provided with control point 3, and the output end of converter is connected with the input terminal of the battery, the electric power storage
Control point 5 is provided between the output end in pond and the input terminal of inverter；
The output end of the control module respectively with the control point 1, the control point 2, the control point 3, the control point 4
It is connected with the control point 5, the processor is connected with the input terminal of the control module, the input of the remote signal module
End is connected with the control point 1, the control point 2, the control point 3, the control point 4 and the control point 5 respectively, institute
The output end for stating remote signal module is connected with the input terminal of the processor, and the processor is connected with the measurement module,
And the input terminal of measurement module is connected with the measurement point.
2. the anti-reverse flow control device of a kind of photovoltaic plant according to claim 1, which is characterized in that the measurement module packet
Voltage transformer and current transformer are included, the measurement module is for detecting the voltage of measurement point, the size of electric current and direction.
3. the anti-reverse flow control device of a kind of photovoltaic plant according to claim 1, which is characterized in that the control point 1, institute
It states and is separately installed with relay at control point 2, the control point 3, the control point 4 and the control point 5.
4. the anti-reverse flow control device of a kind of photovoltaic plant according to claim 3, which is characterized in that the remote signal module is used
In the switch state of control relay.
5. the anti-reverse flow control device of a kind of photovoltaic plant according to claim 3, which is characterized in that the control module is used
In the switch state for changing relay.
6. a kind of control method of the anti-reverse flow control device of photovoltaic plant according to claim 1, which is characterized in that including
Following steps:
S1: measurement point voltage, the size of electric current and direction are detected by measurement module, and are transferred to processor, passes through processing
Device controls control module, and is closed the relay at control point 1 and control point 2；
S2: when there is adverse current power, but when adverse current power is less than the 5% of rated output, pass through control module and be closed control point 3
A part of alternating current can be converted into direct current and stored to battery by the relay at place, converter；
When there is adverse current power, but when adverse current power is greater than or equal to the 5% of rated output, passes through control module and disconnect control
Relay at point 1, while the relay at control point 4 is closed by control module；
When photovoltaic generating system does not work, the relay at control point 5, the electric current of internal storage battery are closed by control module
Alternating current is converted by inverter.
7. a kind of control method of the anti-reverse flow control device of photovoltaic plant according to claim 6, which is characterized in that described
In S2, there is adverse current power, but when adverse current power is greater than or equal to the 5% of rated output, passes through control module and disconnect control
Relay at point 1, while the relay at control point 4 is closed by control module, and be closed the relay at control point 5,
The electric current of internal storage battery is converted into alternating current by inverter.
8. a kind of control method of the anti-reverse flow control device of photovoltaic plant according to claim 6, which is characterized in that described
In S2, when photovoltaic generating system does not work, the relay at control point 5, the electric current of internal storage battery are closed by control module
Be converted into alternating current by inverter, when measurement point detects adverse current power, by control module disconnect control point 5 at after
Electric appliance.
9. a kind of control method of the anti-reverse flow control device of photovoltaic plant according to claim 6, which is characterized in that described
In S2, there is adverse current power, but when adverse current power is greater than or equal to the 5% of rated output, passes through control module and disconnect control
Relay at point 1, while the relay at control point 4 is closed by control module, when the close saturation of accumulator electric-quantity, lead to
Cross the relay at control module disconnection control point 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910008358.1A CN109802432A (en) | 2019-01-04 | 2019-01-04 | A kind of anti-reverse flow control device of photovoltaic plant and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910008358.1A CN109802432A (en) | 2019-01-04 | 2019-01-04 | A kind of anti-reverse flow control device of photovoltaic plant and its control method |
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| CN109802432A true CN109802432A (en) | 2019-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910008358.1A Pending CN109802432A (en) | 2019-01-04 | 2019-01-04 | A kind of anti-reverse flow control device of photovoltaic plant and its control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113541297A (en) * | 2021-06-03 | 2021-10-22 | 国网浙江省电力有限公司衢州供电公司 | New energy-based microgrid reverse power protection method and system |
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| CN102664429A (en) * | 2012-05-29 | 2012-09-12 | 国电联合动力技术有限公司 | Grid-connected non-networking micro-grid system and control protection method thereof |
| CN103326400A (en) * | 2013-06-24 | 2013-09-25 | 嘉兴清源电气科技有限公司 | Countercurrent-preventing protection and control method for microgrid |
| CN107332270A (en) * | 2016-04-29 | 2017-11-07 | 伊顿飞瑞慕品股份有限公司 | Energy management apparatus for grid-connected photovoltaic system |
| CN107591831A (en) * | 2016-07-07 | 2018-01-16 | 无锡美凯能源科技有限公司 | A kind of topology applied to family energy microgrid |
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2019
- 2019-01-04 CN CN201910008358.1A patent/CN109802432A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110184583A1 (en) * | 2010-01-22 | 2011-07-28 | General Electric Company | Model-based power estimation of photovoltaic power generation system |
| CN102664429A (en) * | 2012-05-29 | 2012-09-12 | 国电联合动力技术有限公司 | Grid-connected non-networking micro-grid system and control protection method thereof |
| CN103326400A (en) * | 2013-06-24 | 2013-09-25 | 嘉兴清源电气科技有限公司 | Countercurrent-preventing protection and control method for microgrid |
| CN107332270A (en) * | 2016-04-29 | 2017-11-07 | 伊顿飞瑞慕品股份有限公司 | Energy management apparatus for grid-connected photovoltaic system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113541297A (en) * | 2021-06-03 | 2021-10-22 | 国网浙江省电力有限公司衢州供电公司 | New energy-based microgrid reverse power protection method and system |
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