CN218829853U - Photovoltaic array and photovoltaic power generation system - Google Patents
Photovoltaic array and photovoltaic power generation system Download PDFInfo
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- CN218829853U CN218829853U CN202223449344.XU CN202223449344U CN218829853U CN 218829853 U CN218829853 U CN 218829853U CN 202223449344 U CN202223449344 U CN 202223449344U CN 218829853 U CN218829853 U CN 218829853U
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Abstract
The utility model discloses a photovoltaic array and photovoltaic power generation system, photovoltaic array includes: the photovoltaic module comprises a plurality of photovoltaic module strings and a plurality of equipotential monitoring units which are connected in parallel, each photovoltaic module string comprises a plurality of photovoltaic modules which are connected in series, each equipotential monitoring unit is respectively connected with a first photovoltaic array equipotential point and a second photovoltaic array equipotential point, the difference value of the relative potential between the first photovoltaic array equipotential point and the second photovoltaic array equipotential point is monitored, and a fault photovoltaic module corresponding to the potential reduction direction in the first photovoltaic array equipotential point and the first photovoltaic array equipotential point is displayed. When any photovoltaic module in the photovoltaic power generation system breaks down, the voltage of its corresponding photovoltaic array equipotential can change, leads to the relative potential difference abnormal value of the monitoring of corresponding equipotential monitoring unit also to change to can show the trouble photovoltaic module that the electric potential direction of reduction corresponds, consequently the utility model discloses can in time discover and fix a position the photovoltaic module who breaks down.
Description
Technical Field
The utility model relates to a photovoltaic power generation technical field, more specifically the theory relates to a photovoltaic array and photovoltaic power generation system.
Background
A photovoltaic generation system (photovoltaic generation system) is a power generation system that directly converts solar radiation energy into electric energy by using a photovoltaic effect of a photovoltaic cell. In a photovoltaic power generation system, a plurality of photovoltaic modules are connected in series and boosted to form a photovoltaic group string, the plurality of photovoltaic group strings are connected in parallel or in series to form a photovoltaic array, and the photovoltaic array is converged, inverted and boosted to be finally connected to the grid.
During the operation of the photovoltaic power generation system, faults such as hidden cracks, PID, hot spots, attenuation, electric leakage and damage of the photovoltaic module can occur, and therefore the normal operation of the photovoltaic power generation system is affected. Therefore, how to timely find and accurately locate the failed photovoltaic module becomes a technical problem that needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model discloses a photovoltaic array and photovoltaic power generation system to realize in time discovering and pinpointing the photovoltaic module who breaks down.
A photovoltaic array, comprising: a plurality of photovoltaic module strings and a plurality of equipotential monitoring units which are connected in parallel, wherein each photovoltaic module string comprises a plurality of photovoltaic modules which are connected in series;
each equipotential monitoring unit is respectively connected with a first photovoltaic array equipotential point and a second photovoltaic array equipotential point, and is used for monitoring the difference value of the relative potential difference between the first photovoltaic array equipotential point and the second photovoltaic array equipotential point and displaying a faulty photovoltaic module corresponding to the potential reduction direction in the first photovoltaic array equipotential point and the first photovoltaic array equipotential point;
the first photovoltaic array isoelectric point is: the photovoltaic array isoelectric point corresponding to the first photovoltaic module in the first photovoltaic module string is: a photovoltaic array isoelectric point corresponding to a second photovoltaic module in a second photovoltaic module string, wherein the position of the first photovoltaic array isoelectric point in the first photovoltaic module string is adjacent to the position of the second photovoltaic array isoelectric point in the second photovoltaic module string;
the photovoltaic module comprises a first photovoltaic module string, a second photovoltaic module string and a plurality of photovoltaic modules, wherein the first photovoltaic module string and the second photovoltaic module string are connected in parallel, the first photovoltaic module string and the second photovoltaic module string are two photovoltaic module strings which are adjacent to each other at random in the photovoltaic module strings, the first photovoltaic module string is any one photovoltaic module in the first photovoltaic module string, the second photovoltaic module string is any one photovoltaic module in the second photovoltaic module string, and the first photovoltaic module string and the second photovoltaic module string are adjacent to each other at positions.
Optionally, the equipotential monitoring unit includes: an equipotential sensor.
Optionally, each equipotential monitoring unit has a unique corresponding identifier, where the identifier is used to characterize the position of each photovoltaic module connected to the corresponding equipotential monitoring unit in the photovoltaic array.
A photovoltaic power generation system, comprising: a photovoltaic inverter, a booster and the photovoltaic array;
the photovoltaic array is used for converting solar light energy into direct current electric energy;
the photovoltaic inverter is connected with the photovoltaic array and used for converting the direct current electric energy into alternating current electric energy;
and the booster is connected with the photovoltaic inverter and used for boosting the alternating current electric energy and outputting the boosted alternating current to a power grid.
According to the above technical scheme, the utility model discloses a photovoltaic array and photovoltaic power generation system, photovoltaic array includes: the photovoltaic module protection system comprises a plurality of photovoltaic module strings and a plurality of equipotential monitoring units which are connected in parallel, wherein each photovoltaic module string comprises a plurality of photovoltaic modules which are connected in series, each equipotential monitoring unit is respectively connected with a first photovoltaic array equipotential point and a second photovoltaic array equipotential point, the difference value of the relative potential difference between the first photovoltaic array equipotential point and the second photovoltaic array equipotential point is monitored, and the faulty photovoltaic modules corresponding to the potential reduction directions in the first photovoltaic array equipotential point and the first photovoltaic array equipotential point are displayed. When arbitrary photovoltaic module among the photovoltaic power generation system broke down, the voltage of the photovoltaic array equipotential that this photovoltaic module corresponds can change, and the relative potential difference heterology that leads to corresponding equipotential monitoring unit monitoring also can change to can show the trouble photovoltaic module that the current potential direction of reduction corresponds, consequently the utility model discloses can in time discover the photovoltaic module who breaks down to can pinpoint the photovoltaic module who breaks down.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the disclosed drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a photovoltaic array disclosed in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a photovoltaic power generation system disclosed in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
The embodiment of the utility model discloses photovoltaic array and photovoltaic power generation system, photovoltaic array includes: the photovoltaic module monitoring system comprises a plurality of photovoltaic module strings and a plurality of equipotential monitoring units which are connected in parallel, wherein each photovoltaic module string comprises a plurality of photovoltaic modules which are connected in series, each equipotential monitoring unit is respectively connected with a first photovoltaic array equipotential point and a second photovoltaic array equipotential point, the relative potential difference value between the first photovoltaic array equipotential point and the second photovoltaic array equipotential point is monitored, and a fault photovoltaic module corresponding to the potential reduction direction in the first photovoltaic array equipotential point and the first photovoltaic array equipotential point is displayed. When any photovoltaic module in the photovoltaic power generation system breaks down, the voltage of the photovoltaic array equipotential point that this photovoltaic module corresponds can change, leads to the relative potential difference abnormal value of the monitoring of corresponding equipotential monitoring unit also can change to can show the trouble photovoltaic module that the current potential direction of decrease corresponds, consequently the utility model discloses can in time discover the photovoltaic module who breaks down, and can pinpoint the photovoltaic module who breaks down.
Referring to fig. 1, the embodiment of the present invention discloses a photovoltaic array's structural schematic diagram, photovoltaic array includes: the photovoltaic module system comprises a plurality of photovoltaic module strings and a plurality of equipotential monitoring units, wherein the photovoltaic module strings are connected in parallel, and each photovoltaic module string comprises a plurality of photovoltaic modules which are connected in series.
As shown in fig. 1, assume that a photovoltaic array includes: n photovoltaic module strings connected in parallel, each photovoltaic module string comprises i photovoltaic modules (PV) connected in series, n and i are positive integers, the equipotential monitoring unit is represented by DA, and each photovoltaic array equipotential point is represented as: p is (1，1) P (2，1) ……P (i，1) ，P (1，2) P (2，2) ……P (i，2) ……P (i，n) The connection relationship between each equipotential monitoring unit and the photovoltaic module PV can be seen in fig. 1.
Each equipotential monitoring unit is respectively connected with a first photovoltaic array equipotential point and a second photovoltaic array equipotential point, and is used for monitoring the difference value of the relative potential difference between the first photovoltaic array equipotential point and the second photovoltaic array equipotential point and displaying the faulty photovoltaic modules corresponding to the potential reduction directions in the first photovoltaic array equipotential point and the first photovoltaic array equipotential point.
The first photovoltaic array isoelectric point is: the photovoltaic array isoelectric point corresponding to the first photovoltaic module in the first photovoltaic module string is: and photovoltaic array isoelectric points corresponding to second photovoltaic modules in a second photovoltaic module string, wherein the positions of the first photovoltaic array isoelectric points in the first photovoltaic module string are adjacent to the positions of the second photovoltaic array isoelectric points in the second photovoltaic module string.
The photovoltaic module comprises a first photovoltaic module string, a second photovoltaic module string and a plurality of photovoltaic modules, wherein the first photovoltaic module string and the second photovoltaic module string are connected in parallel, the first photovoltaic module string and the second photovoltaic module string are two photovoltaic module strings which are adjacent to each other at random in the photovoltaic module strings, the first photovoltaic module string is any one photovoltaic module in the first photovoltaic module string, the second photovoltaic module string is any one photovoltaic module in the second photovoltaic module string, and the first photovoltaic module string and the second photovoltaic module string are adjacent to each other at positions.
Specifically, as shown in fig. 1, the in-th photovoltaic module M in The photovoltaic array isoelectric point corresponding to the input end is P (i-1，n) Photovoltaic module M in The photovoltaic array isoelectric point corresponding to the output end is P (i，n) With P (i ， n) For example, in P (i，n-1) To P (i，n) An equipotential monitoring unit is arranged between the two units and is recorded as: a first equipotential monitoring unit, and at P (i，n) To P (i，n+1) Another equipotential monitoring unit is arranged between the two units and marked as a second equipotential monitoring unit, and when the in-th photovoltaic module M in Electrical parameters, including voltage, current and power, that affect its output after a fault, and at this time, with photovoltaic module M in P is monitored by the connected first equipotential monitoring unit (i，n-1) To P (i，n) The second equipotential monitoring unit can monitor P according to the difference value of the first relative potential difference between the first equipotential monitoring unit and the second equipotential monitoring unit (i，n) To P (i，n+1) A second relative potential difference value therebetween, and the direction of potential decrease M can be determined based on the first relative potential difference value and the second relative potential difference value in So that the photovoltaic module M can be determined in A failure occurs.
It should be noted that, when the photovoltaic module M in When sheltering from, for example, bird droppings shelter from on photovoltaic module's surface, also can appear similar potential change, based on the relative potential difference value of equipotential monitoring unit monitoring, also can obtain the direction that corresponding potential reduces and indicateAnd (3) direction.
In addition, along with the extension of photovoltaic array live time, photovoltaic array's working property also can corresponding reduction, photovoltaic array equipotential point that probably appears more potential reduction in this moment among the photovoltaic array indicates that the photovoltaic module that these potential reduction photovoltaic array equipotential point correspond has appeared unusual decay, confirms that photovoltaic array probably has appeared hidden trouble of splitting, PID, leakage current etc. influence output, under this condition, the utility model discloses a photovoltaic module fault detection device can fix a position trouble photovoltaic module fast to be convenient for the technical staff in time confirm whether change, maintain etc. trouble photovoltaic module.
To sum up, the utility model discloses a photovoltaic array, include: the photovoltaic module protection system comprises a plurality of photovoltaic module strings and a plurality of equipotential monitoring units which are connected in parallel, wherein each photovoltaic module string comprises a plurality of photovoltaic modules which are connected in series, each equipotential monitoring unit is respectively connected with a first photovoltaic array equipotential point and a second photovoltaic array equipotential point, the difference value of the relative potential difference between the first photovoltaic array equipotential point and the second photovoltaic array equipotential point is monitored, and the faulty photovoltaic modules corresponding to the potential reduction directions in the first photovoltaic array equipotential point and the first photovoltaic array equipotential point are displayed. When arbitrary photovoltaic module among the photovoltaic power generation system broke down, the voltage of the photovoltaic array equipotential that this photovoltaic module corresponds can change, and the relative potential difference heterology that leads to corresponding equipotential monitoring unit monitoring also can change to can show the trouble photovoltaic module that the current potential direction of reduction corresponds, consequently the utility model discloses can in time discover the photovoltaic module who breaks down to can pinpoint the photovoltaic module who breaks down.
Preferably, the equipotential monitoring unit may include: an equipotential sensor.
In practical application, each equipotential monitoring unit has a unique corresponding identifier, and the identifier is used for representing the position of each photovoltaic module connected to the corresponding equipotential monitoring unit in the photovoltaic array, so as to determine the specific position of the failed photovoltaic module in the photovoltaic array.
Corresponding with the embodiment, the utility model also discloses a photovoltaic power generation system.
Referring to fig. 2, the embodiment of the utility model discloses a photovoltaic power generation system's schematic structure diagram, photovoltaic power generation system includes: a photovoltaic inverter 11 (comprising a plurality of DC/AC), a booster 12 and a photovoltaic array 13 as shown in fig. 1.
The photovoltaic array 13 is used for converting solar energy into direct current electric energy;
the photovoltaic inverter 11 is connected with the photovoltaic array 13 and is used for converting the direct current electric energy into alternating current electric energy;
the booster 12 is connected to the photovoltaic inverter 11, and is configured to boost the ac power and output the boosted ac power to the grid.
To sum up, the utility model discloses a photovoltaic power generation system, include: the photovoltaic array 13 converts solar light energy into direct current electric energy, the photovoltaic inverter 11 converts the direct current electric energy into alternating current electric energy, the booster 12 boosts the alternating current electric energy and outputs the boosted alternating current electric energy to a power grid. The utility model discloses in when arbitrary photovoltaic module among the photovoltaic power generation system broke down, the voltage of the photovoltaic array equipotential that this photovoltaic module corresponds can change, and the relative potential difference heterology that leads to corresponding equipotential monitoring unit monitoring among the photovoltaic array 13 also can change to can show the trouble photovoltaic module that the current potential direction of decrease corresponds, consequently the utility model discloses can in time discover the photovoltaic module who breaks down to can pinpoint the photovoltaic module who breaks down.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred 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 invention. 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 invention. Thus, the present invention 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 (4)
1. A photovoltaic array, comprising: a plurality of photovoltaic module strings and a plurality of equipotential monitoring units connected in parallel, each of the photovoltaic module strings including a plurality of photovoltaic modules connected in series;
each equipotential monitoring unit is respectively connected with a first photovoltaic array equipotential point and a second photovoltaic array equipotential point, and is used for monitoring the difference value of the relative potential difference between the first photovoltaic array equipotential point and the second photovoltaic array equipotential point and displaying a faulty photovoltaic module corresponding to the potential reduction direction in the first photovoltaic array equipotential point and the first photovoltaic array equipotential point;
the first photovoltaic array isoelectric point is: the photovoltaic array isoelectric point corresponding to the first photovoltaic module in the first photovoltaic module string is: a photovoltaic array isoelectric point corresponding to a second photovoltaic module in a second photovoltaic module string, wherein the position of the first photovoltaic array isoelectric point in the first photovoltaic module string is adjacent to the position of the second photovoltaic array isoelectric point in the second photovoltaic module string;
the photovoltaic module string comprises a first photovoltaic module string and a second photovoltaic module string, wherein the first photovoltaic module string and the second photovoltaic module string are connected in parallel, the first photovoltaic module string and the second photovoltaic module string are a plurality of the photovoltaic module string, the second photovoltaic module string comprises any two adjacent photovoltaic module strings, the first photovoltaic module string comprises any one photovoltaic module in the first photovoltaic module string, the second photovoltaic module string comprises any one photovoltaic module, and the first photovoltaic module is located in the first photovoltaic module string and the second photovoltaic module is located in the second photovoltaic module string, wherein the first photovoltaic module string and the second photovoltaic module string are connected in parallel, and are a plurality of the two adjacent photovoltaic module strings in the photovoltaic module string.
2. The photovoltaic array of claim 1, wherein the equipotential monitoring unit comprises: an equipotential sensor.
3. The pv array of claim 1, wherein each of the isoelectric monitoring units has a unique corresponding identifier that characterizes a location of each of the pv modules to which the corresponding isoelectric monitoring unit is connected in the pv array.
4. A photovoltaic power generation system, comprising: a photovoltaic inverter, a voltage booster and a photovoltaic array as claimed in any one of claims 1 to 3;
the photovoltaic array is used for converting solar light energy into direct current electric energy;
the photovoltaic inverter is connected with the photovoltaic array and used for converting the direct current electric energy into alternating current electric energy;
the booster is connected with the photovoltaic inverter and used for boosting the alternating current energy and outputting the boosted alternating current to a power grid.
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| CN202223449344.XU CN218829853U (en) | 2022-12-21 | 2022-12-21 | Photovoltaic array and photovoltaic power generation system |
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| CN202223449344.XU CN218829853U (en) | 2022-12-21 | 2022-12-21 | Photovoltaic array and photovoltaic power generation system |
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