CN214473857U - Photovoltaic group string prevents reverse connection device and photovoltaic system - Google Patents
Photovoltaic group string prevents reverse connection device and photovoltaic system Download PDFInfo
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- CN214473857U CN214473857U CN202120518148.XU CN202120518148U CN214473857U CN 214473857 U CN214473857 U CN 214473857U CN 202120518148 U CN202120518148 U CN 202120518148U CN 214473857 U CN214473857 U CN 214473857U
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Abstract
The application discloses photovoltaic group cluster prevents reverse connection device includes: the device comprises a one-way conduction circuit, a first conduction switch and a second conduction switch which are provided with an alternative output path, and a controller which is used for detecting the target output voltage of the one-way conduction circuit and controlling the output paths of the first conduction switch and the second conduction switch according to the target output voltage; the input end of the unidirectional conduction circuit is respectively connected with one end of the photovoltaic string and the input end of the first conduction switch, and the output end of the unidirectional conduction circuit is respectively connected with the other end of the photovoltaic string and the input end of the second conduction switch; correspondingly, the output end of the first conduction switch and the output end of the second conduction switch are respectively connected with two ends of the connector. Obviously, the controller can control the output paths of the first conduction switch and the second conduction switch according to the target output voltage of the unidirectional conduction circuit, and the photovoltaic string can be correctly connected to the direct-current input end of the inverter through the connector.
Description
Technical Field
The utility model relates to a photovoltaic power generation technical field, in particular to photovoltaic group cluster prevent reverse connection device and a photovoltaic system.
Background
In the existing photovoltaic system, the dc power output by the photovoltaic string needs to be converted into ac power by the inverter before being input into the target grid. Because the transmission distance between the photovoltaic string and the inverter is long, a connector is usually required to be arranged between the photovoltaic string and the inverter. However, in the actual operation process, sometimes an operator reverses the positive and negative electrodes of the connector, so that the photovoltaic string cannot be correctly connected to the dc input end of the inverter, and the inverter cannot be normally started. At present, no simple and effective solution exists for the technical problem.
Therefore, how to ensure that the photovoltaic string can be correctly connected to the dc input terminal of the inverter through the connector is a technical problem to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a photovoltaic group cluster prevent reverse connection device and a photovoltaic system to guarantee that photovoltaic group cluster can insert the direct current input end of dc-to-ac converter correctly through the connector. The specific scheme is as follows:
an anti-reverse connection device of a photovoltaic string comprises: the device comprises a one-way conduction circuit, a first conduction switch and a second conduction switch which are provided with an alternative output path, and a controller which is used for detecting the target output voltage of the one-way conduction circuit and controlling the output paths of the first conduction switch and the second conduction switch according to the target output voltage;
the input end of the unidirectional conduction circuit is respectively connected with one end of the photovoltaic string and the input end of the first conduction switch, and the output end of the unidirectional conduction circuit is respectively connected with the other end of the photovoltaic string and the input end of the second conduction switch;
correspondingly, the output end of the first conduction switch and the output end of the second conduction switch are respectively connected with two ends of the connector.
Preferably, the controller is a single chip microcomputer or an MCU.
Preferably, the first conducting switch and the second conducting switch are both single-pole double-throw switches.
Preferably, the method further comprises the following steps:
and the display is connected with the controller and used for prompting corresponding early warning information according to the target output voltage.
Preferably, the unidirectional conducting circuit is a diode.
Preferably, the diode has a breakdown voltage greater than 1000 Vdc.
Correspondingly, the utility model also discloses a photovoltaic system, include as aforementioned the anti-device that prevents joining in marriage of a photovoltaic group cluster that discloses.
It can be seen that, in the utility model discloses an anti-reverse connection device, because when connecting in parallel the single-direction conducting circuit at the both ends of photovoltaic group cluster, the one-way conducting circuit is just connecing or is connect conversely with the photovoltaic group cluster, and the one-way conducting circuit can have different output voltage value, so, the controller just can determine the positive negative pole of photovoltaic group cluster through the detection to one-way conducting circuit output voltage. At the moment, the controller can control the output paths of the first conduction switch and the second conduction switch according to the target output voltage of the unidirectional conduction circuit, and the connection of the photovoltaic string and the positive electrode and the negative electrode of the connector is kept consistent, so that the photovoltaic string can be correctly connected to the direct current input end of the inverter through the connector. Correspondingly, the utility model discloses a photovoltaic system has above-mentioned beneficial effect equally.
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, 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 provided drawings without creative efforts.
Fig. 1 is a structural diagram of an anti-reverse connection device for a photovoltaic string provided in an embodiment of the present invention;
fig. 2 is a structural diagram of an anti-reverse connection device for another photovoltaic string provided by the 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 work belong to the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a structural diagram of an anti-reverse connection device for a photovoltaic string provided in an embodiment of the present invention, the anti-reverse connection device includes: the circuit comprises a one-way conduction circuit, two first conduction switches S1 and a second conduction switch S2 which are provided with an alternative output path, and a controller which is used for detecting the target output voltage of the one-way conduction circuit and controlling the output paths of the first conduction switch S1 and the second conduction switch S2 according to the target output voltage;
the input end of the unidirectional conduction circuit is respectively connected with one end of the photovoltaic string and the input end of the first conduction switch S1, and the output end of the unidirectional conduction circuit is respectively connected with the other end of the photovoltaic string and the input end of the second conduction switch S2;
accordingly, the output terminal of the first conducting switch S1 and the output terminal of the second conducting switch S2 are connected to the two terminals of the connector, respectively.
It can be understood that, due to the manufacturing process of the photovoltaic cell, when the positive electrode and the negative electrode of the photovoltaic string are connected together, the photovoltaic string can output limited short-circuit current, for example, less than 10A, and the photovoltaic string cannot be burnt, so that, based on the attribute characteristic of the photovoltaic string, the connection condition of the positive electrode and the negative electrode of the photovoltaic string and the unidirectional conducting circuit can be judged by connecting the unidirectional conducting circuit in parallel at the two ends of the photovoltaic string and measuring the target output voltage of the unidirectional conducting circuit.
That is, when the controller detects that the target output voltage of the unidirectional conduction circuit is an output value greater than a preset positive voltage, it indicates that the unidirectional conduction circuit is not conducted, the current of the photovoltaic string flows to the rear-end circuit, and the connection of the positive electrode and the negative electrode is correct; and when the controller detects that the target output voltage of the unidirectional conduction circuit is equal to a preset negative value, the unidirectional conduction circuit is conducted, the current of the photovoltaic string flows through the unidirectional conduction circuit to form a short circuit loop, and the positive electrode and the negative electrode are connected in a reverse mode, so that the positive electrode and the negative electrode of the photovoltaic string can be determined.
Specifically, when the controller detects that the target output voltage of the unidirectional conduction circuit is an output value greater than a preset positive voltage value, it indicates that the unidirectional conduction circuit is not conducted, and the current of the photovoltaic string flows to the back-end circuit. At this time, whether the positive electrode and the negative electrode of the connector are reversely connected or not, the controller controls the output paths of the first conducting switch S1 and the second conducting switch S2, and enables the connection condition of the positive electrode and the negative electrode of the connector to be consistent with the current flowing direction of the photovoltaic string, so that the photovoltaic string can be correctly connected to the direct current input end of the inverter through the connector.
Similarly, when the controller detects that the target output voltage of the unidirectional conduction circuit is a preset negative value, the unidirectional conduction circuit is conducted, the current of the photovoltaic string flows through the unidirectional conduction circuit to form a short circuit loop, and the positive electrode and the negative electrode are connected in an opposite mode. At this time, whether the positive electrode and the negative electrode of the connector are reversely connected or not, the controller controls the output channels of the first conducting switch S1 and the second conducting switch S2, and the connection condition of the positive electrode and the negative electrode of the connector is opposite to the current flowing direction of the unidirectional conducting circuit, so that the photovoltaic string can be correctly connected to the direct current input end of the inverter through the connector.
It should be noted that, in this embodiment, the controller may be any programmable logic device capable of implementing the above-mentioned detection control function, and the one-way conduction circuit and the conduction switch having the alternative output path may be any device or circuit module capable of implementing a corresponding logic function, which is not limited herein.
Therefore, in the anti-reverse connection device disclosed in this embodiment, when the unidirectional conducting circuit is connected in parallel to the two ends of the photovoltaic string, the unidirectional conducting circuit and the photovoltaic string are connected in the forward direction or in the reverse direction, and the unidirectional conducting circuit has different output voltage values, so that the controller can determine the positive and negative electrodes of the photovoltaic string by detecting the output voltage of the unidirectional conducting circuit. At the moment, the controller can control the output paths of the first conduction switch and the second conduction switch according to the target output voltage of the unidirectional conduction circuit, and the connection of the photovoltaic string and the positive electrode and the negative electrode of the connector is kept consistent, so that the photovoltaic string can be correctly connected to the direct current input end of the inverter through the connector.
Based on the above embodiments, the present embodiment further describes and optimizes the technical solution, and as a preferred implementation, the controller is specifically a single chip microcomputer or an MCU.
Specifically, the controller can be set as a single chip microcomputer, and the single chip microcomputer has the advantages of high integration level, large storage capacity and strong external expansion capability, so that the external expansion capability of the reverse connection preventing device can be relatively improved when the controller is set as the single chip microcomputer.
Or, the Controller can be set as an MCU (Micro Controller Unit), because the MCU has not only a low power consumption, but also a small occupied space compared with other programmable logic devices, when the Controller is set as the MCU, the occupied space of the anti-reverse device can be further reduced.
Based on the above embodiments, this embodiment further describes and optimizes the technical solution, and as a preferred implementation, the first conducting switch S1 and the second conducting switch S2 are both single-pole double-throw switches.
It can be understood that, because the spdt switch not only has two output paths, but also has stable performance and simple structure, when the first conducting switch S1 and the second conducting switch S2 are configured as spdt switches, the difficulty of manufacturing the reverse connection preventing apparatus can be relatively simplified.
Based on the above embodiment, the present embodiment further describes and optimizes the technical solution, please refer to fig. 2, and fig. 2 is a structural diagram of an anti-reverse connection device for another photovoltaic string provided by the embodiment of the present invention. As a preferred embodiment, the unidirectional conducting circuit is embodied as a diode.
In practical application, the unidirectional conducting circuit can be set as a diode, and the diode not only has the advantages of stable and reliable performance, but also has low manufacturing cost, so that the design cost required by the anti-reverse connection device can be further reduced when the unidirectional conducting circuit is set as the diode.
In a preferred embodiment, the diode has a breakdown voltage greater than 1000 Vdc.
It can be understood that, in the actual operation process, the pv string is usually composed of 22 pv modules connected in series to obtain a higher dc input voltage, and therefore, in order to ensure the safety of the diode in the actual use process, in this embodiment, a diode with a voltage withstanding value greater than 1000Vdc is selected.
Based on the above embodiment, this embodiment further describes and optimizes the technical solution, and as a preferred implementation, the reverse connection preventing device for the photovoltaic string further includes:
and the display is connected with the controller and used for prompting corresponding early warning information according to the target output voltage.
The target output voltage of the unidirectional conduction circuit can represent the connection condition of the positive electrode and the negative electrode of the photovoltaic string, and the target output voltage of the unidirectional conduction circuit can represent whether the unidirectional conduction circuit breaks down or not, so that the connection condition of the positive electrode and the negative electrode of the photovoltaic string and the operation condition of the unidirectional conduction circuit in the anti-reverse connection device can be determined through the target output voltage of the unidirectional conduction circuit.
Based on the working principle of the reverse connection preventing device, in practical application, a display used for prompting corresponding early warning information according to the target output voltage of the unidirectional conducting circuit can be added in the reverse connection preventing device. Obviously, by the arrangement mode, the user experience of the user when using the reverse connection preventing device can be further improved.
Here, the warning information displayed on the display will be described in detail by a specific example. Assume in practical applications that the output voltage of the pv string has a value of 750Vdc, the short-circuit current is 9.5Adc, the unidirectional conducting circuit is a diode with a tube voltage drop of 0.7Vdc, and the first conducting switch and the second conducting switch are a first single-pole double-throw switch and a second single-pole double-throw switch, respectively.
When the controller measures that the voltage at the two ends of the diode is zero, the diode is damaged, a short circuit occurs, and at the moment, the display displays prompt information of 'please replace the diode'; when the controller measures that the voltage at the two ends of the diode is-0.7V, the situation that the diode is reversely connected with the photovoltaic group string is indicated, and at the moment, the display can display prompt information of 'please connect the output channel of the first single-pole double-throw switch to the cathode of the connector and connect the output channel of the second single-pole double-throw switch to the anode of the connector'; when the controller measures that the voltage at the two ends of the diode is smaller than-2V, the diode is indicated to be broken, and at the moment, the display displays prompt information of 'please replace the diode'; when the voltage at the two ends of the diode is measured to be more than 2V by the controller, the fact that the serial connection of the diode and the photovoltaic group is correct is indicated, and at the moment, the display can display prompt information of connecting the output channel of the first single-pole double-throw switch to the anode of the connector and connecting the output channel of the second single-pole double-throw switch to the cathode of the connector.
Correspondingly, the utility model also discloses a photovoltaic system, include as aforementioned the anti-device that prevents joining in marriage of a photovoltaic group cluster that discloses.
The utility model discloses a photovoltaic system has the aforementioned disclosed beneficial effect that photovoltaic group cluster prevents reverse connection device has.
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 (7)
1. An anti-reverse connection device of a photovoltaic group string is characterized by comprising: the device comprises a one-way conduction circuit, a first conduction switch and a second conduction switch which are provided with an alternative output path, and a controller which is used for detecting the target output voltage of the one-way conduction circuit and controlling the output paths of the first conduction switch and the second conduction switch according to the target output voltage;
the input end of the unidirectional conduction circuit is respectively connected with one end of the photovoltaic string and the input end of the first conduction switch, and the output end of the unidirectional conduction circuit is respectively connected with the other end of the photovoltaic string and the input end of the second conduction switch;
correspondingly, the output end of the first conduction switch and the output end of the second conduction switch are respectively connected with two ends of the connector.
2. The reverse connection prevention device according to claim 1, wherein the controller is a single chip microcomputer or an MCU.
3. The reverse connection prevention device according to claim 1, wherein the first conducting switch and the second conducting switch are both single-pole double-throw switches.
4. The reverse-connection preventing device according to claim 1, further comprising:
and the display is connected with the controller and used for prompting corresponding early warning information according to the target output voltage.
5. Anti-reverse connection device according to any one of claims 1 to 4, characterized in that said unidirectional conducting circuit is in particular a diode.
6. An anti-reverse connection device according to claim 5, wherein the withstand voltage value of the diode is greater than 1000 Vdc.
7. A photovoltaic system comprising a photovoltaic string reverse connection prevention apparatus as claimed in any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120518148.XU CN214473857U (en) | 2021-03-11 | 2021-03-11 | Photovoltaic group string prevents reverse connection device and photovoltaic system |
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| CN202120518148.XU CN214473857U (en) | 2021-03-11 | 2021-03-11 | Photovoltaic group string prevents reverse connection device and photovoltaic system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114002612A (en) * | 2021-10-26 | 2022-02-01 | 珠海格力电器股份有限公司 | Reverse connection detection circuit and method and power supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114002612A (en) * | 2021-10-26 | 2022-02-01 | 珠海格力电器股份有限公司 | Reverse connection detection circuit and method and power supply system |
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