CN108183461B - Photovoltaic power station current direction protection method and central control module - Google Patents
Photovoltaic power station current direction protection method and central control module Download PDFInfo
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- CN108183461B CN108183461B CN201810179043.9A CN201810179043A CN108183461B CN 108183461 B CN108183461 B CN 108183461B CN 201810179043 A CN201810179043 A CN 201810179043A CN 108183461 B CN108183461 B CN 108183461B
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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
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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
- H02H3/081—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
Abstract
The application discloses a photovoltaic power station current direction protection method and a central control module, wherein the central control module of a photovoltaic power station grid-connected device judges whether three preset conditions are simultaneously met, namely, at least one phase has overcurrent, the current direction is the same as the current direction of the photovoltaic power station grid-connected device, or a first preset condition that a direction element in the photovoltaic power station current direction protection device is not input, a second preset condition that the direction element is not input and/or a busbar TV of the photovoltaic power station grid-connected device is normal, and a third preset condition that an overcurrent pressure plate is in an input state; and when the three preset conditions are met at the same time, after the corresponding preset time, an overcurrent tripping control signal is output to the photovoltaic power station current direction protection device, so that the accurate protection of the photovoltaic power station in the overcurrent is ensured.
Description
Technical Field
The application relates to the technical field of power protection equipment, in particular to a photovoltaic power station current direction protection method and a central control module.
Background
Generally, a photovoltaic power station operates in a power generation state in daytime, and solar energy is directly converted into electric energy to generate power to a power grid; and the photovoltaic power station is generally in a power receiving state at night, for example, the micro-grid system receives electric energy of a power grid at night to supply power to a load.
However, in the current distributed power generation system or micro-grid system, the current protection scheme is irrelevant to the electric energy direction; when a short-circuit fault occurs at a certain point, the protection elements on both sides closest to the point are operated, and the other protection elements in the line where the short-circuit current flows to the point are caused to malfunction.
Disclosure of Invention
In view of the above, the application discloses a current direction protection method and a central control module for a photovoltaic power station, so as to realize accurate protection for the photovoltaic power station during overcurrent.
The photovoltaic power station current direction protection method is applied to a central control module of a photovoltaic power station grid-connected device, wherein the photovoltaic power station grid-connected device is connected between an inverter alternating current side of a photovoltaic power station and a grid public connection point, and the central control module is connected with a photovoltaic power station current direction protection device of the photovoltaic power station grid-connected device; the current direction protection method of the photovoltaic power station comprises the following steps:
judging whether the first preset condition, the second preset condition and the third preset condition are met at the same time; the first preset condition is as follows: at least one phase is over-current, the current direction is the same as the current direction of the photovoltaic power station grid-connected device, or a directional element in the photovoltaic power station current direction protection device is not input; the second preset condition is: the direction element is not put into operation, and/or a bus TV of the photovoltaic power station grid-connected device is normal; the third preset condition is: the overcurrent pressing plate is in a put-in state;
and if the first preset condition, the second preset condition and the third preset condition are met at the same time, outputting an overcurrent tripping control signal to the current direction protection device of the photovoltaic power station after corresponding preset time.
Preferably, the overcurrent trip control signal includes: an overcurrent 1-section trip control signal and an overcurrent 2-section trip control signal;
after the corresponding preset time length, outputting an overcurrent trip control signal, wherein the overcurrent trip control signal comprises the following steps of:
outputting the tripping control signal of the overcurrent section 1 after the preset time length corresponding to the overcurrent section 1;
and outputting the tripping control signal of the overcurrent 2 section after the preset time corresponding to the overcurrent 2 section.
Preferably, the step of outputting an overcurrent trip control signal to the photovoltaic power station current direction protection device further comprises:
and outputting the overcurrent trip signal for display or remote transmission.
The central control module is applied to a photovoltaic power station grid-connected device, the photovoltaic power station grid-connected device is connected between an inverter alternating-current side of a photovoltaic power station and a power grid public connection point, and the central control module is connected with a photovoltaic power station current direction protection device of the photovoltaic power station grid-connected device; the central control module includes:
the judging unit is used for judging whether the first preset condition, the second preset condition and the third preset condition are met at the same time; the first preset condition is as follows: at least one phase is over-current, the current direction is the same as the current direction of the photovoltaic power station grid-connected device, or a directional element in the photovoltaic power station current direction protection device is not input; the second preset condition is: the direction element is not put into operation, and/or a bus TV of the photovoltaic power station grid-connected device is normal; the third preset condition is: the overcurrent pressing plate is in a put-in state;
and the delay output unit is used for outputting an overcurrent trip control signal to the current direction protection device of the photovoltaic power station after corresponding preset time length under the condition that the first preset condition, the second preset condition and the third preset condition are simultaneously met.
Preferably, the overcurrent trip control signal includes: an overcurrent 1-section trip control signal and an overcurrent 2-section trip control signal;
the delay output unit is used for outputting an overcurrent trip control signal after corresponding preset time length, and is specifically used for:
outputting the tripping control signal of the overcurrent section 1 after the preset time length corresponding to the overcurrent section 1;
and outputting the tripping control signal of the overcurrent 2 section after the preset time corresponding to the overcurrent 2 section.
Preferably, the delay output unit is further configured to: and outputting the overcurrent tripping control signal to the photovoltaic power station current direction protection device and simultaneously displaying or remotely transmitting the overcurrent tripping control signal.
Preferably, the method further comprises: and the setting unit is used for setting the threshold value, the direction and the preset duration of the overcurrent according to the received information.
Preferably, the judging unit includes: a first and gate, a second and gate, a third and gate, a fourth and gate, a fifth and gate, a sixth and gate, a seventh and gate, an eighth and gate, a ninth and gate, a tenth and gate, an eleventh and gate, a twelfth and gate, a thirteenth and gate, a first or gate, a second or gate, a third or gate, a fourth or gate, a fifth or gate, a sixth or gate, a seventh or gate, a NOT gate, and a NAND gate; wherein:
one input end of the first AND gate, one input end of the third AND gate and one input end of the fifth AND gate all receive signals representing whether the current direction of the photovoltaic power station grid-connected device is positive or not;
one input end of the second AND gate, one input end of the fourth AND gate and one input end of the sixth AND gate all receive signals representing whether the current direction of the photovoltaic power station grid-connected device is the opposite direction or not;
the other input end of the first AND gate receives a signal representing whether the current of the phase A is in the positive direction or not;
the other input end of the third AND gate receives a signal representing whether the B-phase current is in the positive direction or not;
the other input end of the fifth AND gate receives a signal representing whether the C-phase current is in the positive direction or not;
the other input end of the second AND gate receives a signal representing whether the A-phase current is in the opposite direction or not;
the other input end of the fourth AND gate receives a signal representing whether the B-phase current is in the opposite direction or not;
the other input end of the sixth AND gate receives a signal representing whether the C-phase current is in the opposite direction or not;
the output end of the first AND gate and the output end of the second AND gate are respectively connected with the two input ends of the first OR gate in a one-to-one correspondence manner;
the output end of the third AND gate and the output end of the fourth AND gate are respectively connected with the two input ends of the second OR gate in a one-to-one correspondence manner;
the output end of the fifth AND gate and the output end of the sixth AND gate are respectively connected with the two input ends of the third OR gate in a one-to-one correspondence manner;
the input end of the NOT gate and one input end of the NOT gate receive signals representing whether the direction element is put into or not;
the output end of the NOT gate is respectively connected with one input end of the fourth OR gate, one input end of the fifth OR gate and one input end of the sixth OR gate;
the other input end of the fourth OR gate is connected with the output end of the first OR gate;
the other input end of the fifth OR gate is connected with the output end of the second OR gate;
the other input end of the sixth OR gate is connected with the output end of the third OR gate;
the other input end of the NAND gate receives a signal representing whether a bus TV of the photovoltaic power station grid-connected device is abnormal or not;
the output end of the NAND gate is respectively connected with one input end of the seventh AND gate, one input end of the eighth AND gate and one input end of the ninth AND gate;
the other input end of the seventh AND gate is connected with the output end of the fourth OR gate;
the other input end of the eighth AND gate is connected with the output end of the fifth OR gate;
the other input end of the ninth AND gate is connected with the output end of the sixth OR gate;
one input end of the tenth AND gate is connected with the output end of the seventh AND gate, and the other input end of the tenth AND gate receives a signal representing whether the A-phase current exceeds a current threshold value;
one input end of the eleventh AND gate is connected with the output end of the eighth AND gate, and the other input end of the eleventh AND gate receives a signal representing whether the B phase current exceeds a current threshold value;
one input end of the twelfth AND gate is connected with the output end of the ninth AND gate, and the other input end of the twelfth AND gate receives a signal representing whether the C-phase current exceeds a current threshold value;
the output end of the tenth AND gate, the output end of the eleventh AND gate and the output end of the twelfth AND gate are respectively connected with the three input ends of the seventh OR gate in a one-to-one correspondence manner;
the output end of the seventh or gate is connected with one input end of the thirteenth or gate;
the other input end of the thirteenth AND gate receives a signal representing whether the overcurrent pressing plate is in a put-in state or not;
the output end of the thirteenth AND gate is connected with the input end of the delay output unit.
Preferably, the delay output unit includes: a delay circuit;
the input end of the delay circuit is connected with the output end of the thirteenth AND gate;
and the output end of the delay circuit outputs the overcurrent tripping control signal.
According to the technical scheme, the central control module of the photovoltaic power station grid-connected device judges whether three preset conditions are simultaneously met, namely, a first preset condition that at least one phase has overcurrent and the current direction is the same as the current direction of the photovoltaic power station grid-connected device or a direction element in the photovoltaic power station current direction protection device is not input, a second preset condition that the direction element is not input and/or a busbar TV of the photovoltaic power station grid-connected device is normal, and a third preset condition that an overcurrent pressing plate is in an input state; and when the three preset conditions are met at the same time, after the corresponding preset time, an overcurrent tripping control signal is output to the photovoltaic power station current direction protection device, so that the accurate protection of the photovoltaic power station in the overcurrent is ensured.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic connection diagram of a grid-connected device of a photovoltaic power station according to an embodiment of the present application;
fig. 2 is a flowchart of a photovoltaic power station current direction protection method according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a central control module according to an embodiment of the present application;
fig. 4 is a schematic diagram of current direction protection of a photovoltaic power station by a central control module according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The application discloses a current direction protection method of a photovoltaic power station, which aims to realize accurate protection of the photovoltaic power station in the case of overcurrent.
The photovoltaic power station current direction protection method is applied to a central control module of a photovoltaic power station grid-connected device; referring to fig. 1, the photovoltaic power station grid-connected device is connected between an inverter alternating-current side of a photovoltaic power station and a grid public connection point, and a central control module is connected with a photovoltaic power station current direction protection device of the photovoltaic power station grid-connected device;
referring to fig. 2, the photovoltaic power station current direction protection method includes:
s101, judging whether a first preset condition, a second preset condition and a third preset condition are met at the same time;
the first preset condition is as follows: at least one phase of the photovoltaic power station has overcurrent, the current direction is the same as the current direction of the photovoltaic power station grid-connected device, or a directional element in the photovoltaic power station current direction protection device is not input; the second preset condition is: the directional element is not put into, and/or a busbar TV of the photovoltaic power station grid-connected device is normal; the third preset condition is: the overcurrent pressing plate is in a put-in state;
in specific practical application, the photovoltaic power station grid-connected device can be subjected to two-section current direction protection through the central control module and the photovoltaic power station current direction protection device; an operator can independently set the threshold value, the direction and the preset duration of the overcurrent of each section through inputting information, and can set a setting control word through inputting information, so as to control the switching of the two sections of protection.
In the photovoltaic power plant current direction protection device, may specifically include: the two-section type current-voltage direction protection interphase power direction element adopts 90-degree wiring, and utilizes each phase current to be respectively compared with corresponding voltage (Ia and Ubc, ib and Uca, ic and Uab), and takes the comparative phase of Ia and Ubc as an example, the action equation is as follows:
wherein phi is the maximum sensitivity angle, which is-30 degrees.
If the first preset condition, the second preset condition and the third preset condition are satisfied at the same time, executing step S102;
s102, outputting an overcurrent trip control signal to a photovoltaic power station current direction protection device after a corresponding preset time period.
Preferably, the overcurrent trip control signal includes: an overcurrent 1-section trip control signal and an overcurrent 2-section trip control signal;
step S102 includes:
outputting an overcurrent 1-section tripping control signal after the preset time length corresponding to the overcurrent 1-section;
and outputting an overcurrent 2-section tripping control signal after the preset time corresponding to the overcurrent 2-section.
More preferably, in step S102, while outputting the overcurrent trip control signal to the current direction protection device of the photovoltaic power station, the method may further include:
and outputting the overcurrent trip signal for display or remote transmission.
According to the photovoltaic power station current direction protection method provided by the embodiment, the central control module of the photovoltaic power station grid-connected device judges whether three preset conditions are simultaneously met, namely, at least one phase of first preset conditions that overcurrent occurs and the current direction is the same as that of the photovoltaic power station grid-connected device, or a direction element in the photovoltaic power station current direction protection device is not input, second preset conditions that the direction element is not input and/or a bus TV of the photovoltaic power station grid-connected device is normal, and third preset conditions that an overcurrent pressure plate is in an input state; when the three preset conditions are met simultaneously, outputting an overcurrent trip control signal to a current direction protection device of the photovoltaic power station after corresponding preset time periods; the application combines the current direction judgment, avoids the problem that in the prior art, when a short circuit fault occurs at a certain point, the short circuit current flows to other protection elements in the line at the point to generate misoperation, and ensures the accurate protection of the photovoltaic power station when the overcurrent occurs.
The other embodiment of the application also provides a central control module which is applied to a photovoltaic power station grid-connected device, and referring to fig. 1, the photovoltaic power station grid-connected device is connected between an inverter alternating-current side of a photovoltaic power station and a grid public connection point, and the central control module is connected with a photovoltaic power station current direction protection device of the photovoltaic power station grid-connected device;
specifically, referring to fig. 3, the central control module includes:
the judging unit is used for judging whether the first preset condition, the second preset condition and the third preset condition are met at the same time; the first preset condition is: at least one phase of the photovoltaic power station has overcurrent, the current direction is the same as the current direction of the photovoltaic power station grid-connected device, or a directional element in the photovoltaic power station current direction protection device is not input; the second preset condition is: the directional element is not put into, and/or a busbar TV of the photovoltaic power station grid-connected device is normal; the third preset condition is: the overcurrent pressing plate is in a put-in state;
and the delay output unit is used for outputting an overcurrent trip control signal to the current direction protection device of the photovoltaic power station after corresponding preset time length under the condition that the first preset condition, the second preset condition and the third preset condition are simultaneously met.
Preferably, the overcurrent trip control signal includes: an overcurrent 1-section trip control signal and an overcurrent 2-section trip control signal;
the delay output unit is used for outputting an overcurrent trip control signal after corresponding preset time length, and is specifically used for:
outputting an overcurrent 1-section tripping control signal after the preset time length corresponding to the overcurrent 1-section;
and outputting an overcurrent 2-section tripping control signal after the preset time corresponding to the overcurrent 2-section.
Preferably, the delay output unit is further configured to: and outputting the overcurrent tripping control signal to the photovoltaic power station current direction protection device and simultaneously displaying or remotely transmitting the overcurrent tripping control signal.
Preferably, the central control module further comprises: and the setting unit is used for setting the threshold value, the direction and the preset duration of the overcurrent according to the received information.
For convenience of understanding, the application also discloses a schematic diagram of the central control module for protecting the current direction of the photovoltaic power station, referring to fig. 4, the judging unit comprises: first and gate 101, second and gate 102, third and gate 103, fourth and gate 104, fifth and gate 105, sixth and gate 106, seventh and gate 107, eighth and gate 108, ninth and gate 109, tenth and gate 110, eleventh and gate 111, twelfth and gate 112, thirteenth and gate 113, first or gate 201, second or gate 202, third or gate 203, fourth or gate 204, fifth or gate 205, sixth or gate 206, seventh or gate 207, NOT gate 301, and NOT gate 302; the delay output unit includes a delay circuit 400; wherein:
one input end of the first and gate 101, one input end of the third and gate 103 and one input end of the fifth and gate 105 all receive signals representing whether the current direction of the photovoltaic power station grid-connected device is positive;
one input end of the second and gate 102, one input end of the fourth and gate 104 and one input end of the sixth and gate 106 all receive signals representing whether the current direction of the photovoltaic power plant grid-connected device is the opposite direction;
the other input of the first and gate 101 receives a signal indicating whether the a-phase current is in the positive direction;
the other input of the third and gate 103 receives a signal indicating whether the B-phase current is in the positive direction;
the other input of the fifth and gate 105 receives a signal indicating whether the C-phase current is in the positive direction;
the other input of the second AND gate 102 receives a signal indicative of whether the A-phase current is in the opposite direction;
the other input of the fourth AND gate 104 receives a signal indicating whether the B-phase current is in the opposite direction;
the other input of the sixth and gate 106 receives a signal indicating whether the C-phase current is in the opposite direction;
the output end of the first AND gate 101 and the output end of the second AND gate 102 are respectively connected with two input ends of the first OR gate 201 in a one-to-one correspondence manner;
the output end of the third AND gate 103 and the output end of the fourth AND gate 104 are respectively connected with two input ends of the second OR gate 202 in a one-to-one correspondence manner;
the output end of the fifth and gate 105 and the output end of the sixth and gate 106 are respectively connected with two input ends of the third or gate 203 in a one-to-one correspondence manner;
the input of the NOT gate 301 and one input of the NOT gate 302 both receive a signal that characterizes whether the directional element is on;
the output of the NOT gate 301 is connected to one input of the fourth OR gate 204, one input of the fifth OR gate 205, and one input of the sixth OR gate 206, respectively;
the other input of the fourth or gate 204 is connected to the output of the first or gate 201;
the other input of the fifth or gate 205 is connected to the output of the second or gate 202;
the other input of the sixth or gate 206 is connected to the output of the third or gate 203;
the other input end of the NAND gate 302 receives a signal representing whether the bus TV of the photovoltaic power station grid-connected device is abnormal or not;
the output end of the nand gate 302 is connected to one input end of the seventh and gate 107, one input end of the eighth and gate 108, and one input end of the ninth and gate 109, respectively;
the other input of the seventh and gate 107 is connected to the output of the fourth or gate 204;
the other input of the eighth and gate 108 is connected to the output of the fifth or gate 205;
the other input of the ninth and gate 109 is connected to the output of the sixth or gate 206;
one input end of the tenth and gate 110 is connected to the output end of the seventh and gate 107, and the other input end of the tenth and gate 110 receives a signal indicating whether the a-phase current exceeds a current threshold;
one input end of the eleventh and gate 111 is connected to the output end of the eighth and gate 108, and the other input end of the eleventh and gate 111 receives a signal indicating whether the B-phase current exceeds a current threshold;
one input end of the twelfth AND gate 112 is connected with the output end of the ninth AND gate 109, and the other input end of the twelfth AND gate 112 receives a signal indicating whether the C-phase current exceeds a current threshold;
the output end of the tenth and gate 110, the output end of the eleventh and gate 111 and the output end of the twelfth and gate 112 are respectively connected with the three input ends of the seventh or gate 207 in a one-to-one correspondence manner;
an output of the seventh or gate 207 is connected to an input of the thirteenth and gate 113;
the other input terminal of the thirteenth and gate 113 receives a signal indicating whether the overcurrent pressing plate is in the put-in state;
an output of thirteenth AND gate 113 is connected to an input of delay circuit 400;
the output end of the delay circuit 400 outputs an overcurrent trip control signal to the photovoltaic power station current direction protection device to finish corresponding trip; meanwhile, the output end of the delay circuit 400 also outputs an overcurrent trip signal for display and remote transmission, and in addition, the output end of the delay circuit 400 can also output a central signal to enable protection to be performed.
In fig. 4, the preset duration Tn in the delay circuit 400 will be different according to n, where n is the number of segments of the overcurrent, and is 1 or 2.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The photovoltaic power station current direction protection method is characterized by being applied to a central control module of a photovoltaic power station grid-connected device, wherein the photovoltaic power station grid-connected device is connected between an inverter alternating current side of a photovoltaic power station and a grid public connection point, and the central control module is connected with a photovoltaic power station current direction protection device of the photovoltaic power station grid-connected device; the current direction protection method of the photovoltaic power station comprises the following steps:
judging whether the first preset condition, the second preset condition and the third preset condition are met at the same time; the first preset condition is as follows: at least one phase is over-current, the current direction is the same as the current direction of the photovoltaic power station grid-connected device, or a directional element in the photovoltaic power station current direction protection device is not input; the second preset condition is: the direction element is not put into operation, and/or a bus TV of the photovoltaic power station grid-connected device is normal; the third preset condition is: the overcurrent pressing plate is in a put-in state;
and if the first preset condition, the second preset condition and the third preset condition are met at the same time, outputting an overcurrent tripping control signal to the current direction protection device of the photovoltaic power station after corresponding preset time.
2. The method of claim 1, wherein the over-current trip control signal comprises: an overcurrent 1-section trip control signal and an overcurrent 2-section trip control signal;
after the corresponding preset time length, outputting an overcurrent trip control signal, wherein the overcurrent trip control signal comprises the following steps of:
outputting the tripping control signal of the overcurrent section 1 after the preset time length corresponding to the overcurrent section 1;
and outputting the tripping control signal of the overcurrent 2 section after the preset time corresponding to the overcurrent 2 section.
3. The method of claim 1, wherein the outputting the overcurrent trip control signal to the photovoltaic power plant current direction protection device is accompanied by:
and outputting the overcurrent trip signal for display or remote transmission.
4. The central control module is characterized by being applied to a photovoltaic power station grid-connected device, wherein the photovoltaic power station grid-connected device is connected between an inverter alternating-current side of a photovoltaic power station and a power grid public connection point, and the central control module is connected with a photovoltaic power station current direction protection device of the photovoltaic power station grid-connected device; the central control module includes:
the judging unit is used for judging whether the first preset condition, the second preset condition and the third preset condition are met at the same time; the first preset condition is as follows: at least one phase is over-current, the current direction is the same as the current direction of the photovoltaic power station grid-connected device, or a directional element in the photovoltaic power station current direction protection device is not input; the second preset condition is: the direction element is not put into operation, and/or a bus TV of the photovoltaic power station grid-connected device is normal; the third preset condition is: the overcurrent pressing plate is in a put-in state;
and the delay output unit is used for outputting an overcurrent trip control signal to the current direction protection device of the photovoltaic power station after corresponding preset time length under the condition that the first preset condition, the second preset condition and the third preset condition are simultaneously met.
5. The central control module of claim 4, wherein the over-current trip control signal comprises: an overcurrent 1-section trip control signal and an overcurrent 2-section trip control signal;
the delay output unit is used for outputting an overcurrent trip control signal after corresponding preset time length, and is specifically used for:
outputting the tripping control signal of the overcurrent section 1 after the preset time length corresponding to the overcurrent section 1;
and outputting the tripping control signal of the overcurrent 2 section after the preset time corresponding to the overcurrent 2 section.
6. The central control module of claim 4, wherein the delay output unit is further configured to: and outputting the overcurrent tripping control signal to the photovoltaic power station current direction protection device and simultaneously displaying or remotely transmitting the overcurrent tripping control signal.
7. The central control module of claim 4, further comprising: and the setting unit is used for setting the threshold value, the direction and the preset duration of the overcurrent according to the received information.
8. The central control module according to any one of claims 4-7, wherein the judging unit includes: a first and gate, a second and gate, a third and gate, a fourth and gate, a fifth and gate, a sixth and gate, a seventh and gate, an eighth and gate, a ninth and gate, a tenth and gate, an eleventh and gate, a twelfth and gate, a thirteenth and gate, a first or gate, a second or gate, a third or gate, a fourth or gate, a fifth or gate, a sixth or gate, a seventh or gate, a NOT gate, and a NAND gate; wherein:
one input end of the first AND gate, one input end of the third AND gate and one input end of the fifth AND gate all receive signals representing whether the current direction of the photovoltaic power station grid-connected device is positive or not;
one input end of the second AND gate, one input end of the fourth AND gate and one input end of the sixth AND gate all receive signals representing whether the current direction of the photovoltaic power station grid-connected device is the opposite direction or not;
the other input end of the first AND gate receives a signal representing whether the current of the phase A is in the positive direction or not;
the other input end of the third AND gate receives a signal representing whether the B-phase current is in the positive direction or not;
the other input end of the fifth AND gate receives a signal representing whether the C-phase current is in the positive direction or not;
the other input end of the second AND gate receives a signal representing whether the A-phase current is in the opposite direction or not;
the other input end of the fourth AND gate receives a signal representing whether the B-phase current is in the opposite direction or not;
the other input end of the sixth AND gate receives a signal representing whether the C-phase current is in the opposite direction or not;
the output end of the first AND gate and the output end of the second AND gate are respectively connected with the two input ends of the first OR gate in a one-to-one correspondence manner;
the output end of the third AND gate and the output end of the fourth AND gate are respectively connected with the two input ends of the second OR gate in a one-to-one correspondence manner;
the output end of the fifth AND gate and the output end of the sixth AND gate are respectively connected with the two input ends of the third OR gate in a one-to-one correspondence manner;
the input end of the NOT gate and one input end of the NOT gate receive signals representing whether the direction element is put into or not;
the output end of the NOT gate is respectively connected with one input end of the fourth OR gate, one input end of the fifth OR gate and one input end of the sixth OR gate;
the other input end of the fourth OR gate is connected with the output end of the first OR gate;
the other input end of the fifth OR gate is connected with the output end of the second OR gate;
the other input end of the sixth OR gate is connected with the output end of the third OR gate;
the other input end of the NAND gate receives a signal representing whether a bus TV of the photovoltaic power station grid-connected device is abnormal or not;
the output end of the NAND gate is respectively connected with one input end of the seventh AND gate, one input end of the eighth AND gate and one input end of the ninth AND gate;
the other input end of the seventh AND gate is connected with the output end of the fourth OR gate;
the other input end of the eighth AND gate is connected with the output end of the fifth OR gate;
the other input end of the ninth AND gate is connected with the output end of the sixth OR gate;
one input end of the tenth AND gate is connected with the output end of the seventh AND gate, and the other input end of the tenth AND gate receives a signal representing whether the A-phase current exceeds a current threshold value;
one input end of the eleventh AND gate is connected with the output end of the eighth AND gate, and the other input end of the eleventh AND gate receives a signal representing whether the B phase current exceeds a current threshold value;
one input end of the twelfth AND gate is connected with the output end of the ninth AND gate, and the other input end of the twelfth AND gate receives a signal representing whether the C-phase current exceeds a current threshold value;
the output end of the tenth AND gate, the output end of the eleventh AND gate and the output end of the twelfth AND gate are respectively connected with the three input ends of the seventh OR gate in a one-to-one correspondence manner;
the output end of the seventh or gate is connected with one input end of the thirteenth or gate;
the other input end of the thirteenth AND gate receives a signal representing whether the overcurrent pressing plate is in a put-in state or not;
the output end of the thirteenth AND gate is connected with the input end of the delay output unit.
9. The central control module of claim 8, wherein the delay output unit comprises: a delay circuit;
the input end of the delay circuit is connected with the output end of the thirteenth AND gate;
and the output end of the delay circuit outputs the overcurrent tripping control signal.
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