CN108183461A - A kind of photovoltaic plant directional current protection method and central control module - Google Patents
A kind of photovoltaic plant directional current protection method and central control module Download PDFInfo
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- CN108183461A CN108183461A CN201810179043.9A CN201810179043A CN108183461A CN 108183461 A CN108183461 A CN 108183461A CN 201810179043 A CN201810179043 A CN 201810179043A CN 108183461 A CN108183461 A CN 108183461A
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- door
- input terminal
- overcurrent
- output terminal
- preset condition
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/083—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for three-phase systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/081—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current and depending on the direction
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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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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of photovoltaic plant directional current protection method and central control modules; judged whether to meet three preset conditions simultaneously by the central control module of photovoltaic electric station grid connection device; i.e. there is overcurrent in an at least phase and current direction is identical with the current direction of the photovoltaic electric station grid connection device or photovoltaic plant directional current protection device in the first preset condition for not putting into of directional element; directional element is not put into and/or normal second preset conditions of the busbar TV of photovoltaic electric station grid connection device; and overcurrent pressing plate is in the third preset condition of input state；And when meeting above three preset condition simultaneously, after corresponding preset duration, output overcurrent tripping control signal to photovoltaic plant directional current protection device, it is ensured that accurate protection during for photovoltaic plant overcurrent.
Description
Technical field
The present invention relates to electrical protection apparatus technical field, protected more specifically, being related to a kind of photovoltaic plant current direction
Maintaining method and central control module.
Background technology
Under normal circumstances, photovoltaic plant runs on generating state on daytime, and solar energy is converted directly into electric energy, to power grid
Power generation；And photovoltaic plant is typically at night by electricity condition, such as the electric energy that micro-grid system will receive power grid at night, is
Load supplying.
However in current distributed generation system or micro-grid system, overcurrent protection scheme with electric energy direction without
It closes；When short trouble occurs in certain point, the both sides protection element closest with it can act, also, can lead to short circuit current
Other protection elements flowed in the circuit of the point generate malfunction.
Invention content
In view of this, the present invention discloses a kind of photovoltaic plant directional current protection method and central control module, to realize
Accurate protection during for photovoltaic plant overcurrent.
A kind of photovoltaic plant directional current protection method, in the central control module applied to photovoltaic electric station grid connection device,
The photovoltaic electric station grid connection device is connected between the inverter ac side of photovoltaic plant and power grid points of common connection, the center
Control module is connected with the photovoltaic plant directional current protection device of the photovoltaic electric station grid connection device；The photovoltaic plant electric current
Direction protection method includes：
Judge whether to meet the first preset condition, the second preset condition and third preset condition simultaneously；Described first is default
Condition is：There is overcurrent in an at least phase and current direction is identical with the current direction of the photovoltaic electric station grid connection device, alternatively, institute
The directional element stated in photovoltaic plant directional current protection device is not put into；Second preset condition is：The directional element
Do not put into and/or, the busbar TV of the photovoltaic electric station grid connection device is normal；The third preset condition is：Overcurrent pressing plate is in
Input state；
If meet first preset condition, second preset condition and the third preset condition simultaneously, right
After the preset duration answered, output overcurrent tripping control signal to the photovoltaic plant directional current protection device.
Preferably, the overcurrent tripping control signal includes：The 2 sections of tripping controls of 1 section of tripping control signal of overcurrent and overcurrent
Signal；
It is described that output overcurrent tripping controls signal after corresponding preset duration, including：
After the preset duration corresponding to 1 section of overcurrent, described 1 section of tripping control signal of overcurrent is exported；
After the preset duration corresponding to 2 sections of overcurrent, described 2 sections of tripping control signals of overcurrent are exported.
Preferably, in the same of output overcurrent tripping control signal to the photovoltaic plant directional current protection device
When, it further includes：
Output overcurrent trip signal is shown or teletransmission.
A kind of central control module, applied to photovoltaic electric station grid connection device, the photovoltaic electric station grid connection device is connected to light
Between the inverter ac side of overhead utility and power grid points of common connection, the central control module is filled with the photovoltaic electric station grid connection
The photovoltaic plant directional current protection device put is connected；The central control module includes：
Judging unit, for judging whether to meet simultaneously the first preset condition, the second preset condition and third preset condition；
First preset condition is：An at least phase overcurrent occurs and the current direction of current direction and the photovoltaic electric station grid connection device
It is identical, alternatively, the directional element in the photovoltaic plant directional current protection device is not put into；Second preset condition is：
The directional element do not put into and/or, the busbar TV of the photovoltaic electric station grid connection device is normal；The third preset condition is：
Overcurrent pressing plate is in input state；
Be delayed output unit, for meeting first preset condition, second preset condition and described the at the same time
In the case of three preset conditions, after corresponding preset duration, output overcurrent tripping control signal to photovoltaic plant electricity
Flow high-frequency orientation protector.
Preferably, the overcurrent tripping control signal includes：The 2 sections of tripping controls of 1 section of tripping control signal of overcurrent and overcurrent
Signal；
The delay output unit is used for after corresponding preset duration, when output overcurrent tripping controls signal, specifically
For：
After the preset duration corresponding to 1 section of overcurrent, described 1 section of tripping control signal of overcurrent is exported；
After the preset duration corresponding to 2 sections of overcurrent, described 2 sections of tripping control signals of overcurrent are exported.
Preferably, the delay output unit is additionally operable to：It trips in output overcurrent and controls signal to photovoltaic plant electricity
While flowing high-frequency orientation protector, output overcurrent trip signal is shown or teletransmission.
Preferably, it further includes：Unit is adjusted, for the information according to reception, to the threshold value of overcurrent, direction and preset duration
It is configured.
Preferably, the judging unit includes：First with door, second with door, third and door, the 4th with door, the 5th with door,
6th with door, the 7th with door, the 8th with door, the 9th with door, the tenth with door, the 11st with door, the 12nd with door, the 13rd with
Door, first or door, second or door, third or door, the 4th or door, the 5th or door, the 6th or door, the 7th or door, NOT gate and with it is non-
Door；Wherein：
Described first with an input terminal of door, an input terminal of the third and door and the described 5th and one of door
Input terminal receive characterize the photovoltaic electric station grid connection device current direction whether be positive direction signal；
Described second with an input terminal of door, the described 4th with an input terminal of door and the described 6th with one of door
Input terminal receive characterize the photovoltaic electric station grid connection device current direction whether be negative direction signal；
Described first with another input terminal of door receive characterization A phase currents whether be positive direction signal；
Another input terminal of the third and door receive characterization B phase currents whether be positive direction signal；
Described 5th with another input terminal of door receive characterization C phase currents whether be positive direction signal；
Described second with another input terminal of door receive characterization A phase currents whether be negative direction signal；
Described 4th with another input terminal of door receive characterization B phase currents whether be negative direction signal；
Described 6th with another input terminal of door receive characterization C phase currents whether be negative direction signal；
Described first is defeated with two of described first or door respectively with the output terminal of door with the output terminal of door and described second
Enter end one-to-one correspondence to be connected；
The output terminal of the third and door and the described 4th defeated with two of described second or door respectively with the output terminal of door
Enter end one-to-one correspondence to be connected；
Described 5th is defeated with two of the third or door respectively with the output terminal of door with the output terminal of door and the described 6th
Enter end one-to-one correspondence to be connected；
The input terminal of the NOT gate and an input terminal of the NAND gate receive whether the characterization directional element is thrown
The signal entered；
The output terminal of the NOT gate respectively with the described 4th or door an input terminal, the described 5th or one of door input
End and the described 6th or an input terminal of door be connected；
Described 4th or another input terminal of door be connected with the output terminal of described first or door；
Described 5th or another input terminal of door be connected with the output terminal of described second or door；
Described 6th or another input terminal of door be connected with the output terminal of the third or door；
Whether the busbar TV that another input terminal of the NAND gate receives the characterization photovoltaic electric station grid connection device is abnormal
Signal；
The output terminal of the NAND gate respectively with the described 7th with an input terminal of door, the described 8th with one of door it is defeated
Enter to hold and the described 9th is connected with an input terminal of door；
Described 7th is connected with another input terminal of door with the output terminal of the described 4th or door；
Described 8th is connected with another input terminal of door with the output terminal of the described 5th or door；
Described 9th is connected with another input terminal of door with the output terminal of the described 6th or door；
Described tenth is connected with an input terminal of door with the described 7th with the output terminal of door, and the described tenth is another with door
A input terminal receive characterization A phase currents whether be more than current threshold signal；
Described 11st is connected with an input terminal of door with the described 8th with the output terminal of door, and the described 11st with door
Another input terminal receive characterization B phase currents whether be more than current threshold signal；
Described 12nd is connected with an input terminal of door with the described 9th with the output terminal of door, and the described 12nd with door
Another input terminal receive characterization C phase currents whether be more than current threshold signal；
Described tenth with the output terminal of door, the described 11st with the output terminal of door and the described 12nd with the output terminal point of door
Three input terminals one-to-one correspondence not with the described 7th or door is connected；
Described 7th or the output terminal of door be connected with the described 13rd with an input terminal of door；
Described 13rd receives with another input terminal of door and characterizes the letter whether the overcurrent pressing plate is in input state
Number；
Described 13rd is connected with the output terminal of door with the input terminal of the delay output unit.
Preferably, the delay output unit includes：Delay circuit；
The input terminal of the delay circuit is connected with the described 13rd with the output terminal of door；
The output terminal of the delay circuit exports the overcurrent tripping control signal.
It can be seen from the above technical scheme that photovoltaic plant directional current protection method disclosed by the invention, by photovoltaic
The central control module of electric station grid connection device judges whether to meet three preset conditions simultaneously, i.e., at least overcurrent and electricity occurs in a phase
Flow that direction is identical with the current direction of the photovoltaic electric station grid connection device or photovoltaic plant directional current protection device in side
The first preset condition not put into element, directional element is not put into and/or the busbar TV of photovoltaic electric station grid connection device is normal
Second preset condition and, overcurrent pressing plate is in the third preset condition of input state；And above three ought be met simultaneously and preset item
During part, after corresponding preset duration, output overcurrent tripping control signal to photovoltaic plant directional current protection device, it is ensured that
Accurate protection during for photovoltaic plant overcurrent.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of connection diagram of photovoltaic electric station grid connection device disclosed by the embodiments of the present invention；
Fig. 2 is a kind of flow chart of photovoltaic plant directional current protection method disclosed by the embodiments of the present invention；
Fig. 3 is a kind of structure diagram of central control module disclosed by the embodiments of the present invention；
Fig. 4 is the principle that a kind of central control module disclosed by the embodiments of the present invention carries out photovoltaic plant directional current protection
Figure.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
The present invention disclose a kind of photovoltaic plant directional current protection method, with realization for photovoltaic plant overcurrent when it is accurate
Protection.
The photovoltaic plant directional current protection method, in the central control module applied to photovoltaic electric station grid connection device；Ginseng
See Fig. 1, which is connected between the inverter ac side of photovoltaic plant and power grid points of common connection, and in
Centre control module is connected with the photovoltaic plant directional current protection device of photovoltaic electric station grid connection device；
Referring to Fig. 2, which includes：
S101, judge whether to meet the first preset condition, the second preset condition and third preset condition simultaneously；
Wherein, the first preset condition is：An at least phase overcurrent occurs and the electricity of current direction and photovoltaic electric station grid connection device
It is identical to flow direction, alternatively, the directional element in photovoltaic plant directional current protection device is not put into；Second preset condition is：Side
Do not put into element and/or, the busbar TV of photovoltaic electric station grid connection device is normal；Third preset condition is：Overcurrent pressing plate, which is in, to be thrown
Enter state；
It, can be by central control module and photovoltaic plant directional current protection device to this in specific practical application
Photovoltaic electric station grid connection device carries out two sections of directional current protections；Operating personnel enable central control module right by inputting information
Threshold value, direction and the preset duration of each section of overcurrent carry out independent setting respectively, and also are able to setting by inputting information and adjust
Control word, and then the throwing of this two sections protections is controlled to move back.
In photovoltaic plant directional current protection device, it can specifically include：Current element, directional element, delay cell and
Signal element, the alternate power directional element of two-part Current Voltage direction protection therein utilize each phase current using 90 ° of wiring
With relevant voltage (Ia and Ubc, Ib and Uca, Ic and Uab) respectively than phase, by taking Ia and Ubc is than phase as an example, then its operation equation is：
Wherein, φ is maximum fineness angle, takes -30 °.
If meeting the first preset condition, the second preset condition and third preset condition simultaneously, step S102 is performed；
S102, after corresponding preset duration, output overcurrent tripping control signal is to photovoltaic plant directional current protection
Device.
Preferably, overcurrent tripping control signal includes：2 sections of tripping control signals of 1 section of tripping control signal of overcurrent and overcurrent；
Then step S102 includes：
After the preset duration corresponding to 1 section of overcurrent, 1 section of tripping control signal of output overcurrent；
After the preset duration corresponding to 2 sections of overcurrent, 2 sections of tripping control signals of output overcurrent.
More preferably, it in step S102, trips in output overcurrent and signal to photovoltaic plant directional current protection is controlled to fill
While putting, it can also include：
Output overcurrent trip signal is shown or teletransmission.
The photovoltaic plant directional current protection method provided in this embodiment is controlled by the center of photovoltaic electric station grid connection device
Module judges whether to meet three preset conditions simultaneously, i.e., overcurrent occurs in an at least phase and current direction is filled with photovoltaic electric station grid connection
The current direction put is identical or photovoltaic plant directional current protection device in the first default item for not putting into of directional element
Part, directional element do not put into and/or normal second preset conditions of the busbar TV of photovoltaic electric station grid connection device and, overcurrent pressing plate
Third preset condition in input state；And when simultaneously meet above three preset condition when, corresponding preset duration it
Afterwards, output overcurrent tripping controls signal to photovoltaic plant directional current protection device；I.e. the application combination current direction judges, keeps away
Other protection elements in the circuit that short circuit current can be caused to flow to the point when short trouble occurs in certain point in the prior art are exempted from
Lead to the problem of malfunction, it is ensured that accurate protection during for photovoltaic plant overcurrent.
Another embodiment of the present invention additionally provides a kind of central control module, applied to photovoltaic electric station grid connection device, referring to
Fig. 1, the photovoltaic electric station grid connection device are connected between the inverter ac side of photovoltaic plant and power grid points of common connection, and in this
Centre control module is connected with the photovoltaic plant directional current protection device of photovoltaic electric station grid connection device；
Specifically, referring to Fig. 3, which includes：
Judging unit, for judging whether to meet simultaneously the first preset condition, the second preset condition and third preset condition；
First preset condition is：An at least phase there is overcurrent and current direction it is identical with the current direction of photovoltaic electric station grid connection device or
Person, the directional element in photovoltaic plant directional current protection device are not put into；Second preset condition is：Directional element is not put into,
And/or the busbar TV of photovoltaic electric station grid connection device is normal；Third preset condition is：Overcurrent pressing plate is in input state；
Be delayed output unit, for meeting the first preset condition, the second preset condition and third preset condition at the same time
In the case of, after corresponding preset duration, output overcurrent tripping control signal to photovoltaic plant directional current protection device.
Preferably, overcurrent tripping control signal includes：2 sections of tripping control signals of 1 section of tripping control signal of overcurrent and overcurrent；
The output unit that is delayed is used for after corresponding preset duration, when output overcurrent tripping controls signal, is specifically used for：
After the preset duration corresponding to 1 section of overcurrent, 1 section of tripping control signal of output overcurrent；
After the preset duration corresponding to 2 sections of overcurrent, 2 sections of tripping control signals of output overcurrent.
Preferably, delay output unit is additionally operable to：Tripping in output overcurrent controls signal to photovoltaic plant current direction to protect
While protection unit, output overcurrent trip signal is shown or teletransmission.
Preferably, which further includes：Unit is adjusted, for the information according to reception, threshold value to overcurrent,
Direction and preset duration are configured.
For convenience of understanding, the invention also discloses the principles that the central control module carries out photovoltaic plant directional current protection
Figure, referring to Fig. 4, judging unit includes：First with door 101, second and door 102, third and door the 103, the 4th and door the 104, the 5th
With door the 105, the 6th and door the 106, the 7th and door the 107, the 8th and door the 108, the 9th and door the 109, the tenth and door the 110, the 11st with
Door the 111, the 12nd and door the 112, the 13rd and door 113, first or door 201, second or door 202, third or door the 203, the 4th or
Door the 204, the 5th or door the 205, the 6th or door the 206, the 7th or door 207, NOT gate 301 and NAND gate 302；Delay output unit includes
Delay circuit 400；Wherein：
First is defeated with one of an input terminal of door 101, an input terminal of third and door 103 and the 5th and door 105
Enter end receive characterization photovoltaic electric station grid connection device current direction whether be positive direction signal；
Second with an input terminal of door 102, the 4th with an input terminal of door 104 and the 6th with one of door 106 it is defeated
Enter end receive characterization photovoltaic electric station grid connection device current direction whether be negative direction signal；
First with another input terminal of door 101 receive characterization A phase currents whether be positive direction signal；
Another input terminal of third and door 103 receive characterization B phase currents whether be positive direction signal；
5th with another input terminal of door 105 receive characterization C phase currents whether be positive direction signal；
Second with another input terminal of door 102 receive characterization A phase currents whether be negative direction signal；
4th with another input terminal of door 104 receive characterization B phase currents whether be negative direction signal；
6th with another input terminal of door 106 receive characterization C phase currents whether be negative direction signal；
First with the output terminal of door 101 and second with the output terminal of door 102 respectively with first or two input terminals of door 201
It corresponds and is connected；
The output terminal of third and door 103 and the 4th with the output terminal of door 104 respectively with second or two input terminals of door 202
It corresponds and is connected；
5th with the output terminal of door 105 and the 6th with the output terminal of door 106 respectively with third or two input terminals of door 203
It corresponds and is connected；
The input terminal of NOT gate 301 and an input terminal of NAND gate 302 receive the letter whether characterization directional element puts into
Number；
The output terminal of NOT gate 301 respectively with the 4th or door 204 an input terminal, the 5th or door 205 an input terminal
And the 6th or an input terminal of door 206 be connected；
4th or another input terminal of door 204 be connected with the output terminal of first or door 201；
5th or another input terminal of door 205 be connected with the output terminal of second or door 202；
6th or another input terminal of door 206 be connected with the output terminal of third or door 203；
Another input terminal of NAND gate 302 receive characterization photovoltaic electric station grid connection device busbar TV whether abnormal letter
Number；
The output terminal of NAND gate 302 respectively with the 7th with an input terminal of door 107, the 8th with an input of door 108
It holds and the 9th is connected with an input terminal of door 109；
7th is connected with another input terminal of door 107 with the output terminal of the 4th or door 204；
8th is connected with another input terminal of door 108 with the output terminal of the 5th or door 205；
9th is connected with another input terminal of door 109 with the output terminal of the 6th or door 206；
Tenth is connected with an input terminal of door 110 with the 7th with the output terminal of door 107, the tenth with door 110 another
Input terminal receive characterization A phase currents whether be more than current threshold signal；
11st is connected with an input terminal of door 111 with the 8th with the output terminal of door 108, and the 11st is another with door 111
One input terminal receive characterization B phase currents whether be more than current threshold signal；
12nd is connected with an input terminal of door 112 with the 9th with the output terminal of door 109, and the 12nd is another with door 112
One input terminal receive characterization C phase currents whether be more than current threshold signal；
Tenth distinguishes with the output terminal of door 110, the 11st with the output terminal of door 111 and the 12nd with the output terminal of door 112
It is connected with three input terminals one-to-one correspondence of the 7th or door 207；
7th or the output terminal of door 207 be connected with the 13rd with an input terminal of door 113；
13rd receives the signal whether characterization overcurrent pressing plate be in input state with another input terminal of door 113；
13rd is connected with the output terminal of door 113 with the input terminal of delay circuit 400；
Output terminal output overcurrent tripping control signal to the photovoltaic plant directional current protection device of delay circuit 400 is completed
Corresponding tripping；Meanwhile the output terminal of the delay circuit 400 also output overcurrent trip signal is shown and teletransmission, in addition, this prolongs
When circuit 400 output terminal can also export central signal and make protection act.
In Fig. 4, the preset duration Tn in delay circuit 400 will be different according to the difference of n, and n is the hop count of overcurrent, is taken
1 or 2.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only include that
A little elements, but also including other elements that are not explicitly listed or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except also there are other identical elements in the process, method, article or apparatus that includes the element.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications of these embodiments will be apparent for those skilled in the art, it is as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide range caused.
Claims (9)
- A kind of 1. photovoltaic plant directional current protection method, which is characterized in that the center control applied to photovoltaic electric station grid connection device In molding block, the photovoltaic electric station grid connection device be connected to the inverter ac side of photovoltaic plant and power grid points of common connection it Between, the central control module is connected with the photovoltaic plant directional current protection device of the photovoltaic electric station grid connection device；It is described Photovoltaic plant directional current protection method includes：Judge whether to meet the first preset condition, the second preset condition and third preset condition simultaneously；First preset condition For：There is overcurrent in an at least phase and current direction is identical with the current direction of the photovoltaic electric station grid connection device, alternatively, the light Directional element in overhead utility directional current protection device is not put into；Second preset condition is：The directional element is not thrown Enter and/or, the busbar TV of the photovoltaic electric station grid connection device is normal；The third preset condition is：Overcurrent pressing plate is in input State；If meet first preset condition, second preset condition and the third preset condition simultaneously, corresponding After preset duration, output overcurrent tripping control signal to the photovoltaic plant directional current protection device.
- 2. photovoltaic plant directional current protection method according to claim 1, which is characterized in that the overcurrent tripping control Signal includes：2 sections of tripping control signals of 1 section of tripping control signal of overcurrent and overcurrent；It is described that output overcurrent tripping controls signal after corresponding preset duration, including：After the preset duration corresponding to 1 section of overcurrent, described 1 section of tripping control signal of overcurrent is exported；After the preset duration corresponding to 2 sections of overcurrent, described 2 sections of tripping control signals of overcurrent are exported.
- 3. photovoltaic plant directional current protection method according to claim 1, which is characterized in that jumped in the output overcurrent While lock controls signal to the photovoltaic plant directional current protection device, further include：Output overcurrent trip signal is shown or teletransmission.
- 4. a kind of central control module, which is characterized in that applied to photovoltaic electric station grid connection device, the photovoltaic electric station grid connection device It is connected between the inverter ac side of photovoltaic plant and power grid points of common connection, the central control module and the photovoltaic electric The photovoltaic plant directional current protection device of grid-connecting apparatus of standing is connected；The central control module includes：Judging unit, for judging whether to meet simultaneously the first preset condition, the second preset condition and third preset condition；It is described First preset condition is：An at least phase overcurrent occurs and the current direction phase of current direction and the photovoltaic electric station grid connection device Together, alternatively, the directional element in the photovoltaic plant directional current protection device is not put into；Second preset condition is：Institute State directional element do not put into and/or, the busbar TV of the photovoltaic electric station grid connection device is normal；The third preset condition is：It crosses Stream pressing plate is in input state；Be delayed output unit, pre- for meeting first preset condition, second preset condition and the third at the same time If in the case of condition, after corresponding preset duration, output overcurrent tripping control signal to the photovoltaic plant electric current side To protective device.
- 5. central control module according to claim 4, which is characterized in that the overcurrent tripping control signal includes：It crosses 2 sections of tripping control signals of 1 section of tripping control signal of stream and overcurrent；The delay output unit is used for after corresponding preset duration, when output overcurrent tripping controls signal, is specifically used for：After the preset duration corresponding to 1 section of overcurrent, described 1 section of tripping control signal of overcurrent is exported；After the preset duration corresponding to 2 sections of overcurrent, described 2 sections of tripping control signals of overcurrent are exported.
- 6. central control module according to claim 4, which is characterized in that the delay output unit is additionally operable to：Defeated While going out overcurrent tripping control signal to the photovoltaic plant directional current protection device, output overcurrent trip signal is shown Show or teletransmission.
- 7. central control module according to claim 4, which is characterized in that further include：Unit is adjusted, for according to reception Information, the threshold value of overcurrent, direction and preset duration are configured.
- 8. according to any central control modules of claim 4-7, which is characterized in that the judging unit includes：First With door, second with door, third and door, the 4th with door, the 5th with door, the 6th with door, the 7th with door, the 8th with door, the 9th with door, Tenth with door, the 11st with door, the 12nd with door, the 13rd with door, first or door, second or door, third or door, the 4th or Door, the 5th or door, the 6th or door, the 7th or door, NOT gate and NAND gate；Wherein：Described first inputs with an input terminal of door, an input terminal of the third and door and the described 5th and one of door End receive characterize the photovoltaic electric station grid connection device current direction whether be positive direction signal；Described second with an input terminal of door, the described 4th with an input terminal of door and the described 6th with an input of door End receive characterize the photovoltaic electric station grid connection device current direction whether be negative direction signal；Described first with another input terminal of door receive characterization A phase currents whether be positive direction signal；Another input terminal of the third and door receive characterization B phase currents whether be positive direction signal；Described 5th with another input terminal of door receive characterization C phase currents whether be positive direction signal；Described second with another input terminal of door receive characterization A phase currents whether be negative direction signal；Described 4th with another input terminal of door receive characterization B phase currents whether be negative direction signal；Described 6th with another input terminal of door receive characterization C phase currents whether be negative direction signal；Described first with the output terminal of door and described second with the output terminal of door respectively with described first or two input terminals of door It corresponds and is connected；The output terminal of the third and door and the described 4th with the output terminal of door respectively with described second or two input terminals of door It corresponds and is connected；Described 5th with the output terminal of door and the described 6th with the output terminal of door respectively with the third or two input terminals of door It corresponds and is connected；The input terminal of the NOT gate and an input terminal of the NAND gate receive what whether the characterization directional element put into Signal；The output terminal of the NOT gate respectively with the described 4th or door an input terminal, the described 5th or door an input terminal and Described 6th or an input terminal of door be connected；Described 4th or another input terminal of door be connected with the output terminal of described first or door；Described 5th or another input terminal of door be connected with the output terminal of described second or door；Described 6th or another input terminal of door be connected with the output terminal of the third or door；Another input terminal of the NAND gate receive characterize the photovoltaic electric station grid connection device busbar TV whether abnormal letter Number；The output terminal of the NAND gate respectively with the described 7th with an input terminal of door, the described 8th with an input terminal of door And the described 9th be connected with an input terminal of door；Described 7th is connected with another input terminal of door with the output terminal of the described 4th or door；Described 8th is connected with another input terminal of door with the output terminal of the described 5th or door；Described 9th is connected with another input terminal of door with the output terminal of the described 6th or door；Described tenth is connected with an input terminal of door with the described 7th with the output terminal of door, the described tenth with door another is defeated Enter end receive characterization A phase currents whether be more than current threshold signal；Described 11st is connected with an input terminal of door with the described 8th with the output terminal of door, and the described 11st is another with door A input terminal receive characterization B phase currents whether be more than current threshold signal；Described 12nd is connected with an input terminal of door with the described 9th with the output terminal of door, and the described 12nd is another with door A input terminal receive characterization C phase currents whether be more than current threshold signal；Described tenth with the output terminal of door, the described 11st with the output terminal of door and the described 12nd with the output terminal of door respectively with Described 7th or door three input terminals correspond be connected；Described 7th or the output terminal of door be connected with the described 13rd with an input terminal of door；Described 13rd receives with another input terminal of door and characterizes the signal whether the overcurrent pressing plate is in input state；Described 13rd is connected with the output terminal of door with the input terminal of the delay output unit.
- 9. central control module according to claim 8, which is characterized in that the delay output unit includes：Delay electricity Road；The input terminal of the delay circuit is connected with the described 13rd with the output terminal of door；The output terminal of the delay circuit exports the overcurrent tripping control signal.
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