CN215934815U - Photovoltaic system and local manager - Google Patents
Photovoltaic system and local manager Download PDFInfo
- Publication number
- CN215934815U CN215934815U CN202121300376.6U CN202121300376U CN215934815U CN 215934815 U CN215934815 U CN 215934815U CN 202121300376 U CN202121300376 U CN 202121300376U CN 215934815 U CN215934815 U CN 215934815U
- Authority
- CN
- China
- Prior art keywords
- voltage
- local manager
- photovoltaic
- photovoltaic module
- control state
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Abstract
The utility model provides a photovoltaic system and a local manager, wherein the photovoltaic system comprises: the photovoltaic module is electrically connected with the inverter through a main circuit, one end of the local manager is connected with the photovoltaic module, the other end of the local manager is connected to the main circuit, the local manager has a first control state and a second control state, and the main controller is in communication connection with the local manager so as to control the local manager to switch between the first control state and the second control state and then control the photovoltaic module to output a first voltage or a second voltage to the inverter; the photovoltaic system further comprises a voltage monitoring device, wherein the voltage monitoring device is in communication connection with the photovoltaic assembly and is used for monitoring the first voltage and the second voltage output by the photovoltaic assembly. Compared with the prior art, the method and the system can quickly judge the control effectiveness of the local manager and the main controller, realize the periodic self-checking function, improve the safety of the photovoltaic system and reduce the maintenance cost of the photovoltaic system.
Description
Technical Field
The utility model relates to the field of solar components, in particular to a photovoltaic system and a local manager.
Background
With the gradual popularization of distributed photovoltaic power stations, the distributed photovoltaic power stations become important components of photovoltaic systems in the future, and photovoltaic modules are widely installed on roofs of civil houses, industrial plants, markets and the like.
The photovoltaic module can produce very high fatal voltage under the illumination condition, and this will bring serious threat to the installation of photovoltaic power plant, maintenance and the work of putting out a fire. How to ensure that emergency personnel are not shocked by the high voltage of the component array in the field treatment becomes a problem to be solved urgently.
At present, most power stations can only realize the function of switching off a main inverter end, which can only cut off the current in the power station, but the power station still has high voltage, and the voltage of a general distributed array is more than 400V, so that the danger that emergency personnel are shocked by high voltage can be caused. The us NEC 2017-Article 690.12 requires that photovoltaic circuits on or in buildings need to be equipped with a fast shut-off function to reduce the shock hazard for emergency response personnel. At present, the mainstream of developed countries such as europe and america is to configure a micro inverter to control the electrical output of each component, but the cost of the scheme is higher and is against the large background of the price-balancing internet access.
In view of the above, there is a need for improvements to existing photovoltaic systems to address the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a low-cost and safe photovoltaic system. The photovoltaic system can cut off a circuit in the photovoltaic system at any time, so that the maximum output voltage of the photovoltaic system is reduced to the human body safety voltage, and constructors are prevented from being shocked by high voltage electricity.
To achieve the above object, the present invention provides a photovoltaic system, comprising: the photovoltaic module is electrically connected with the inverter through a main line, one end of the local manager is connected with the photovoltaic module, the other end of the local manager is connected to the main line, the local manager has a first control state and a second control state, and the main controller is in communication connection with the local manager so as to control the local manager to switch between the first control state and the second control state and further control the photovoltaic module to output a first voltage or a second voltage to the inverter; the photovoltaic system further comprises a voltage monitoring device, wherein the voltage monitoring device is in communication connection with the photovoltaic assembly and is used for monitoring the first voltage and the second voltage output by the photovoltaic assembly.
As a further improvement of the present invention, the voltage monitoring device is installed in the local manager.
As a further improvement of the utility model, the voltage monitoring device is installed in the main controller.
As a further improvement of the present invention, the local manager includes a signal receiving terminal connected to the main controller and a switch connected to the photovoltaic module, where the signal receiving terminal is configured to receive a signal sent by the main controller, and the local manager enters the first control state or the second control state according to the signal, and then controls the switch to be connected to or disconnected from the photovoltaic module, so that the photovoltaic module outputs a first voltage or a second voltage.
As a further improvement of the present invention, the switch is connected in series with the photovoltaic module, and when the local manager enters the first control state, the switch is closed, the photovoltaic module is connected to the main line, and the photovoltaic module outputs a first voltage; when the local manager enters the second control state, the switch is opened, the photovoltaic module is disconnected from the main line, and the photovoltaic module outputs a second voltage, wherein the second voltage is lower than the first voltage.
As a further improvement of the present invention, the switch is connected in parallel with the photovoltaic module, when the local manager enters the first control state, the switch is opened, and the photovoltaic module outputs a first voltage; when the local manager enters the second control state, the switch is closed, the photovoltaic module outputs a second voltage, and the second voltage is lower than the first voltage.
As a further improvement of the present invention, the local manager includes a signal receiving terminal connected to the main controller and a voltage regulating device connected to the signal receiving terminal, the signal receiving terminal is configured to receive a signal sent by the main controller, and the local manager enters the first control state or the second control state according to the signal and then controls the voltage regulating device to operate, so that the photovoltaic module outputs the first voltage or the second voltage.
As a further improvement of the utility model, the voltage regulating device is a DC/DC power converter.
As a further improvement of the utility model, the local manager is arranged on the photovoltaic module.
As a further improvement of the utility model, the main controller is arranged within the inverter.
The utility model also aims to provide a local manager, which is applied to the photovoltaic system.
The utility model has the beneficial effects that: the photovoltaic system is low in cost and high in safety, and can cut off a circuit in the photovoltaic system at any time, so that the maximum output voltage of the photovoltaic system is reduced to the human body safety voltage, and constructors are prevented from being shocked by high voltage. The local manager switches between a first control state and a second control state according to a signal sent by the main controller and a preset rule, so that the photovoltaic module is controlled to output a first voltage or a second voltage, the first voltage or the second voltage output by the photovoltaic module is monitored by the voltage monitoring device, the control effectiveness between the local manager and the main controller is judged quickly, a periodic self-checking function is realized, the safety of a photovoltaic system is improved, and the maintenance cost of the photovoltaic system is reduced.
Drawings
Fig. 1 is a schematic diagram of the structure of a photovoltaic system of the present invention.
Fig. 2 is a flow chart of a self-test method of a photovoltaic system according to a preferred embodiment of the utility model.
Fig. 3 is a flow chart of a self-test method of a photovoltaic system according to another preferred embodiment of the utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.
In addition, it is also to be noted that 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.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the present invention discloses a photovoltaic system, which includes a photovoltaic module, a local manager, a main controller and an inverter, wherein the inverter is electrically connected to the photovoltaic module through a main line, one end of the local manager is connected to the photovoltaic module, and the other end of the local manager is connected to the main line, the local manager has a first control state and a second control state, and the main controller is in communication connection with the local manager to control the local manager to switch between the first control state and the second control state, so as to control the photovoltaic module to output a first voltage or a second voltage to the inverter. The photovoltaic system further comprises a voltage monitoring device, the voltage monitoring device is in communication connection with the photovoltaic assembly and used for monitoring the first voltage and the second voltage output by the photovoltaic assembly, and then whether control between the main controller and the local manager is effective or not can be rapidly judged.
In a preferred embodiment of the present application, there are a plurality of photovoltaic modules, and a plurality of local managers are correspondingly provided, so that each photovoltaic module can be connected to and disconnected from the main line through the corresponding local manager. The main controller is provided with one and is arranged in the inverter to be used as a component or a function of the inverter, and each local manager is in communication connection with the main controller through a wireless network or a PLC (programmable logic controller) so as to receive signals sent by the main controller. Of course, in other embodiments, the number of local managers may also be set to be less than the number of photovoltaic modules, and one local manager may be used to control the on/off of a plurality of photovoltaic modules, which is not limited herein. The main controller may also be separately disposed at any position of the photovoltaic system, and is not limited herein.
The photovoltaic module comprises a photovoltaic laminating part and a frame positioned on the periphery of the photovoltaic laminating part, and the local manager is arranged on the photovoltaic module and is specifically positioned on the frame or the photovoltaic laminating part. Preferably, the local manager may be mechanically attached to the frame of the photovoltaic module, or may be adhered to the back sheet of the photovoltaic laminate, which is not particularly limited herein.
Furthermore, the local manager has a first control state and a second control state, and the main controller controls the local manager to switch between the first control state and the second control state, so as to control the photovoltaic module to output the first voltage or the second voltage to the inverter.
Specifically, after the master controller sends out the operation permission signal, if the local manager receives the operation permission signal sent by the master controller within a set time period (for example, between T1 and T2 time points after each operation permission signal sent by the master controller), the local manager enters a first control state, the local manager controls the photovoltaic module to be connected to the main line and can output a first voltage to the inverter, and at this time, the voltage monitoring device monitors the first voltage output by the photovoltaic module. When the main controller stops sending the operation permission signal or the local manager receives the operation permission signal sent by the main controller or the main controller sends a shutdown signal in a non-set time period (not between the time points T1 and T2 of any operation permission signal), the local manager is switched from the first control state to the second control state, and at the moment, the local manager controls the photovoltaic module to output the second voltage to the inverter. In other words, the local manager will control the disconnection of the photovoltaic module from the main line or limit the output voltage of the photovoltaic module below a certain value. At the moment, the voltage monitoring device monitors the second voltage output by the photovoltaic module.
The above-mentioned "setting time period" may be set to: the local manager receives any one operation permission signal sent by the main controller from T1 to T2; the "unset period" is set to: not between any of the time points T1 to T2, where T2 is later than T1, at which the run enable signal is enabled.
In this application, the first control state refers to a state of normal operation of the photovoltaic system, and the first voltage refers to an output voltage of the photovoltaic system in the normal operation state, that is, a normal operation voltage meeting a specification and output when the photovoltaic system operates normally, at this time, the photovoltaic module is connected to the main line, and the photovoltaic module can output the first voltage to the inverter, so that the whole photovoltaic system operates normally. The second control state refers to an abnormal state of the photovoltaic system, the second voltage refers to output voltage of the photovoltaic system in the abnormal state, namely human body safety voltage which is output when the photovoltaic system is abnormal and meets the regulation, at the moment, the photovoltaic module is disconnected with the main line, or the photovoltaic module is kept connected with the main line but the output voltage of the photovoltaic module is reduced, so that the photovoltaic module can output the second voltage to the inverter, and emergency response personnel are guaranteed not to be shocked by high voltage when handling emergency abnormal events. The specific values of the first voltage and the second voltage are not limited, as long as the whole photovoltaic system can work normally under the first voltage, and emergency response personnel are not shocked by high voltage under the second voltage when handling emergency abnormal events.
The term "abnormal state" as used herein generally includes: temperature anomalies, voltage anomalies, current anomalies, and so forth. Taking "voltage anomaly" as an example, when the voltage at a certain position of the photovoltaic system continuously or repeatedly exceeds a certain value within a period of time, the voltage anomaly can be determined, at this time, the main controller stops sending an operation permission signal or a shutdown signal, so that the local manager enters a second control state, the photovoltaic module is disconnected from the main line or the output voltage of the photovoltaic module is reduced, and the photovoltaic module outputs a second voltage meeting the human body safety regulation to the inverter, so as to ensure the safety of emergency response personnel in handling emergency anomaly events.
Of course, the number of the operation permission signals is not limited to one, and may be plural. When the number of the operation permission signals is multiple, the local manager is started between time points T1 and T2 after receiving each operation permission signal sent by the main controller, so that the photovoltaic module outputs normal voltage to the inverter; and the local manager disconnects the photovoltaic module from the main line or reduces the output voltage of the photovoltaic module when the photovoltaic module is not in any time point between T1 and T2 of the allowed operation signal.
Through the arrangement, the photovoltaic system does not need to judge whether the operation allowing signal skips some pulses, but directly switches on or off the photovoltaic component according to the existence of the operation allowing signal and a preset rule (such as a set time period), so that the judgment process is reduced, and the reliability and the safety are enhanced.
As a preferred embodiment of the present invention, the local manager includes a signal receiving end connected to the main controller and a switch connected to the signal receiving end, where the signal receiving end is configured to receive an operation-allowed signal or a shutdown signal sent by the main controller, so that the local manager enters the first control state or the second control state and controls the switch to be turned on or off. When the signal receiving end receives the operation permission signal within a set time period (between the time points of T1 and T2), the local manager enters a first control state and controls the switch to be closed or opened, so that the photovoltaic module is connected to the main line, and outputs a first voltage to the inverter. When the signal receiving end receives the operation permission signal in the non-set time period (namely, between the non-T1 and the T2 time point) or the signal receiving end receives the turn-off signal or cannot receive the operation permission signal, the local manager enters a second control state and controls the switch to be opened or closed, the photovoltaic module is disconnected with the main line or connected with the main line at low voltage, and the photovoltaic module outputs second voltage to the inverter. The voltage monitoring device monitors the first voltage or the second voltage output by the photovoltaic module, and then can quickly judge whether the control between the main controller and the local manager is effective.
Specifically, the switch and the photovoltaic module can be connected in series or in parallel. When the switch is connected with the photovoltaic module in series, if the signal receiving end receives an operation permission signal sent by the main controller within a set time period (between time points of T1 and T2), the local manager enters a first control state and controls the switch to be closed, at the moment, the photovoltaic module can be connected to the main line and outputs a first voltage to the inverter, and the first voltage is a normal voltage which can be output by the photovoltaic module. If the signal receiving end receives the operation permission signal or does not receive the operation permission signal in the non-set time period (namely, between the non-T1 and the T2 time point), the local manager enters a second control state, controls the switch to be opened, disconnects the photovoltaic module from the main line, and then, the second voltage is zero.
When the switch is connected with the photovoltaic module in parallel, if the signal receiving end receives an operation permission signal sent by the main controller within a set time period (between time points of T1 and T2), the local manager enters a first control state and controls the switch to be opened, at the moment, the photovoltaic module can be connected to the main line and outputs a first voltage to the inverter, and the first voltage is a normal voltage which can be output by the photovoltaic module. If the signal receiving end receives the operation permission signal or does not receive the operation permission signal in the non-set time period (namely, between the non-T1 and the T2 time point), the local manager enters a second control state and controls the switch to be closed, at the moment, the photovoltaic module is connected with the main line at low voltage, and outputs a second voltage to the inverter, wherein the second voltage is lower than the first voltage.
As another preferred embodiment of the present invention, the switch in the above embodiment may be replaced with a voltage regulating device. When the signal receiving end receives an operation permission signal sent by the main controller within a set time period (between the time point T1 and the time point T2), the local manager enters a first control state and controls the voltage regulating device to operate, so that the photovoltaic module is connected to the main line and outputs a first voltage to the inverter. When the signal receiving end receives the operation permission signal in the non-set time period (namely, between the non-T1 time point and the T2 time point) or the signal receiving end receives the turn-off signal or does not receive the operation permission signal, the local manager enters a second control state, controls the voltage regulating device to operate, regulates the output voltage of the photovoltaic module, and enables the photovoltaic module to output a second voltage (low voltage) to the inverter. The voltage monitoring device monitors the first voltage or the second voltage output by the photovoltaic module, and then can quickly judge whether the control between the main controller and the local manager is effective.
Preferably, the voltage regulating device is a DC/DC power converter.
Referring to fig. 2, the present invention further provides a self-checking method of a photovoltaic system, which can quickly determine the control effectiveness of a local manager and a main controller, and implement a periodic self-checking function. The method of the photovoltaic system can be applied to the photovoltaic system, and mainly comprises the following steps:
defining a local manager to have a first control state and a second control state, wherein in the first control state, the local manager controls the photovoltaic module to output a first voltage, and in the second control state, the local manager controls the photovoltaic module to output a second voltage;
the main controller controls the local manager to switch between a first control state and a second control state;
the voltage monitoring device monitors the first voltage or the second voltage output by the photovoltaic module and transmits the first voltage or the second voltage to the monitoring platform of the terminal.
Specifically, when the master controller sends out an operation permission signal, the local manager receives the operation permission signal sent by the master controller within a set time period (for example, between T1 and T2 time points after each operation permission signal sent by the master controller), and then enters a first control state, the local manager controls the photovoltaic module to be connected to the main line and can output a first voltage to the inverter, and at this time, the voltage monitoring device monitors the first voltage output by the photovoltaic module and transmits the first voltage to the monitoring platform of the terminal. When the main controller stops sending the operation permission signal or the local manager receives the operation permission signal sent by the main controller or receives a shutdown signal sent by the main controller within a non-set time period (which is not between the time points T1 and T2 of any operation permission signal), the local manager is switched from the first control state to the second control state, and at the moment, the local manager controls the photovoltaic module to output a second voltage to the inverter. In other words, the local manager will control the disconnection of the photovoltaic module from the main line or limit the output voltage of the photovoltaic module below a certain value. At the moment, the voltage monitoring device monitors the second voltage output by the photovoltaic module and transmits the second voltage to the monitoring platform of the terminal.
And the monitoring platform of the terminal judges whether the first voltage or the second voltage monitored by the voltage monitoring device is normal or not, and judges whether the control between the main controller and the local manager is effective or not according to a judgment result. If the monitoring platform of the terminal judges that the first voltage or the second voltage monitored by the voltage monitoring device is normal, the control between the main controller and the local manager is effective. If the monitoring platform of the terminal judges that the first voltage or the second voltage monitored by the voltage monitoring device is abnormal, the control between the main controller and the local manager is invalid, and at the moment, the whole photovoltaic system can be switched off and the main controller, the local manager or the photovoltaic module can be overhauled according to the abnormal condition. The monitoring result can also be checked in the terminal system manually to judge whether the communication between the main controller and the local manager is normal or not, namely whether the control between the main controller and the local manager is effective or not.
The "normal" means that the first voltage monitored by the voltage monitoring device is a pressure range value when the photovoltaic system operates normally, the second voltage monitored by the voltage monitoring device is a pressure range value which is in accordance with the regulation and belongs to the human body safety voltage, and otherwise, the terminal monitoring platform judges that the first voltage or the second voltage monitored by the voltage monitoring device is abnormal.
Of course, after the voltage monitoring device monitors the first voltage or the second voltage output by the photovoltaic module and transmits the monitoring result to the monitoring platform of the terminal, the monitoring result can also be manually checked in the terminal system to judge whether the communication between the main controller and the local manager is normal, namely whether the control between the main controller and the local manager is effective.
Referring to fig. 3, in another preferred embodiment of the present application, a first preset value and a second preset value are preset in the voltage monitoring device, the first preset value is a pressure range value when the photovoltaic system operates normally, and the second preset value is a pressure range value within a specified voltage range that is safe for human body. The second preset value is smaller than the first preset value. When the voltage monitoring device monitors a first voltage output by the photovoltaic module, the monitoring result is compared with a first preset value, and whether the communication between the main controller and the local manager is normal or not is judged according to the comparison result. If the first voltage is within the first preset value, the control between the main controller and the local manager is effective. If the first voltage is out of the first preset value, the control between the main controller and the local manager is invalid, at the moment, the whole photovoltaic system can be automatically or manually turned off, and the main controller, the local manager or the photovoltaic module can be overhauled according to abnormal conditions. And when the voltage monitoring device monitors a second voltage output by the photovoltaic module, comparing the monitoring result with a second preset value, and judging whether the communication between the main controller and the local manager is normal or not according to the comparison result. If the second voltage is within the second preset value, the control between the main controller and the local manager is effective. If the second voltage is out of the second preset value, the control between the main controller and the local manager is invalid, at the moment, the whole photovoltaic system can be turned off, and the main controller, the local manager or the photovoltaic module can be overhauled according to abnormal conditions, so that the self-inspection of the photovoltaic system is realized.
Further, when the first voltage or the second voltage output by the photovoltaic module and monitored by the voltage monitoring device is out of the range of the first preset value or the second preset value, namely when the control between the main controller and the local manager is invalid, the voltage monitoring device can transmit a warning signal to remind a manager to turn off the whole photovoltaic system and overhaul the main controller or the local manager or the photovoltaic module according to an abnormal condition. The warning signal can be transmitted to a monitoring platform of the terminal, also can be transmitted to a main controller or a local manager, or a voltage monitoring device can also give out warning sound to remind. This is not limited by the present application.
It can be known that the preset first preset value and the preset second preset value can also be set in the monitoring platform of the terminal. When the voltage monitoring device monitors a first voltage or a second voltage output by the photovoltaic module, the monitoring result is transmitted to a monitoring platform of the terminal, the monitoring platform compares the monitoring result with a first preset value or a second preset value, and whether the communication between the main controller and the local manager is normal or not is judged according to the comparison result. Of course, the specific determination process of the voltage monitoring device may adopt other technical schemes, or may be modified according to the actual situation, and is not limited herein.
In a preferred embodiment of the present application, the voltage monitoring device monitors the first voltage/the second voltage output by the photovoltaic module in the first control state/the second control state after the control state of the local manager changes. In other words, the voltage monitoring device monitors the output voltage of the photovoltaic module after a change in the control state of the local manager. Namely, when the main controller sends a signal, the local manager receives an operation permission signal or does not receive the operation permission signal or receives a turn-off signal in a non-set time period, the local manager is switched from the first control state to the second control state, and the voltage monitoring device monitors the second voltage output by the photovoltaic module and transmits the second voltage to the monitoring platform of the terminal. When the main controller sends a signal again, after the local manager receives an operation permission signal within a set time, the local manager is switched to a first control state from a second control state, the voltage monitoring device monitors a first voltage output by the photovoltaic module, and whether control between the main controller and the local manager is effective or not is judged according to a monitoring result.
In other embodiments of the present application, the voltage monitoring device may also periodically or in real time monitor the first voltage/the second voltage output by the photovoltaic module in the first control state/the second control state. Namely, the voltage monitoring device can monitor the first voltage or the second voltage output by the photovoltaic module according to a preset period and transmit the first voltage or the second voltage to the monitoring platform of the terminal. The voltage monitoring device can also monitor the first voltage or the second voltage output by the photovoltaic component in real time and transmit the first voltage or the second voltage to the monitoring platform of the terminal. This is not limited by the present application.
No matter which kind of monitoring methods, voltage monitoring device in case judge that the control between main control unit and the local manager is invalid, can inform the staff to overhaul on the monitoring platform at terminal with signal transmission immediately, has realized photovoltaic system's self-checking.
Furthermore, the installation position and the installation number of the voltage monitoring devices are not limited, and the voltage monitoring devices can be installed in a local manager, a main controller or any position of the photovoltaic system, as long as the self-checking of the photovoltaic system can be realized. When the voltage monitoring devices are installed in the local managers, the number of the voltage monitoring devices is consistent with that of the local managers, and the plurality of voltage monitoring devices are installed in the plurality of local managers, respectively. When the control between the main controller and the local manager is judged to be invalid according to the monitoring result of one voltage monitoring device, and the control between the main controller and other local managers is judged to be valid according to the monitoring results of other voltage monitoring devices, the normal operation of the main controller is indicated, the local manager or the photovoltaic module where the voltage monitoring device is located is judged to be abnormal, and at the moment, only the local manager or the photovoltaic module needs to be overhauled.
In conclusion, the photovoltaic system is low in cost and high in safety, and can cut off a circuit in the photovoltaic system at any time, so that the maximum output voltage of the photovoltaic system is reduced to the human body safety voltage, and constructors are prevented from being shocked by high voltage. The local manager switches between a first control state and a second control state according to a signal sent by the main controller and a preset rule, so that the photovoltaic module is controlled to output a first voltage or a second voltage, the first voltage or the second voltage output by the photovoltaic module is monitored by the voltage monitoring device, the control effectiveness between the local manager and the main controller is judged quickly, a periodic self-checking function is realized, the safety of a photovoltaic system is improved, and the maintenance cost of the photovoltaic system is reduced.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (11)
1. A photovoltaic system, comprising: the photovoltaic module is electrically connected with the inverter through a main line, one end of the local manager is connected with the photovoltaic module, the other end of the local manager is connected to the main line, the local manager has a first control state and a second control state, and the main controller is in communication connection with the local manager so as to control the local manager to switch between the first control state and the second control state and further control the photovoltaic module to output a first voltage or a second voltage to the inverter; the photovoltaic system further comprises a voltage monitoring device, wherein the voltage monitoring device is in communication connection with the photovoltaic assembly and is used for monitoring the first voltage and the second voltage output by the photovoltaic assembly.
2. The photovoltaic system of claim 1, wherein: the voltage monitoring device is installed within the local manager.
3. The photovoltaic system of claim 1, wherein: the voltage monitoring device is installed in the main controller.
4. The photovoltaic system of claim 1, wherein: the local manager comprises a signal receiving end connected with the main controller and a switch connected with the photovoltaic assembly, wherein the signal receiving end is used for receiving a signal sent by the main controller, and the local manager enters the first control state or the second control state according to the signal and then controls the switch to be connected with or disconnected from the photovoltaic assembly so that the photovoltaic assembly outputs a first voltage or a second voltage.
5. The photovoltaic system of claim 4, wherein: the switch is connected in series with the photovoltaic module, when the local manager enters the first control state, the switch is closed, the photovoltaic module is connected to the main line, and the photovoltaic module outputs a first voltage; when the local manager enters the second control state, the switch is opened, the photovoltaic module is disconnected from the main line, and the photovoltaic module outputs a second voltage, wherein the second voltage is lower than the first voltage.
6. The photovoltaic system of claim 4, wherein: the switch is connected with the photovoltaic module in parallel, when the local manager enters the first control state, the switch is opened, and the photovoltaic module outputs a first voltage; when the local manager enters the second control state, the switch is closed, the photovoltaic module outputs a second voltage, and the second voltage is lower than the first voltage.
7. The photovoltaic system of claim 1, wherein: the local manager comprises a signal receiving end connected with the main controller and a voltage regulating device connected with the signal receiving end, wherein the signal receiving end is used for receiving a signal sent by the main controller, and the local manager enters the first control state or the second control state according to the signal and then controls the voltage regulating device to operate so that the photovoltaic module outputs the first voltage or the second voltage.
8. The photovoltaic system of claim 7, wherein: the voltage regulating device is a DC/DC power converter.
9. The photovoltaic system of claim 1, wherein: the photovoltaic module is provided with the local manager.
10. The photovoltaic system of claim 1, wherein: the main controller is arranged in the inverter.
11. A local manager, characterized by: application to a photovoltaic system according to any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121300376.6U CN215934815U (en) | 2021-06-10 | 2021-06-10 | Photovoltaic system and local manager |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121300376.6U CN215934815U (en) | 2021-06-10 | 2021-06-10 | Photovoltaic system and local manager |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215934815U true CN215934815U (en) | 2022-03-01 |
Family
ID=80403093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121300376.6U Active CN215934815U (en) | 2021-06-10 | 2021-06-10 | Photovoltaic system and local manager |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215934815U (en) |
-
2021
- 2021-06-10 CN CN202121300376.6U patent/CN215934815U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102939660B (en) | Method and the photovoltaic apparatus of photovoltaic apparatus generator voltage is limited under dangerous situation | |
| CN103916074B (en) | Closing system and method for photovoltaic system | |
| KR101306772B1 (en) | A protection system of solar power generation facility | |
| CN214799407U (en) | Photovoltaic system, photovoltaic module and local manager | |
| CN110649645B (en) | Quick turn-off device and photovoltaic power generation system applicable to same | |
| CN215934815U (en) | Photovoltaic system and local manager | |
| JP2007116857A (en) | Control device, lightning surge protection system and lightning surge protection method of photovoltaic power generation device | |
| US20200274350A1 (en) | Emergency shutdown of an energy supply unit | |
| CN114400791B (en) | Intelligent photovoltaic power generation monitoring device based on Internet of things and automatic turn-off method | |
| CN215222137U (en) | Photovoltaic system | |
| CN115473491A (en) | Photovoltaic system, local manager and self-checking method of photovoltaic system | |
| CN107910855A (en) | A kind of connection applied to intelligent substation cuts small power supply device and connection blanking method | |
| CN115473493A (en) | Photovoltaic system and method for operating same | |
| CN215222138U (en) | Photovoltaic system | |
| WO2019076152A1 (en) | Method and system for safety protection of photovoltaic system | |
| CN115473492A (en) | Photovoltaic system and method for operating same | |
| KR20180022272A (en) | Automatic power shut-off device to a fire with solar power generation facilities | |
| CN203849611U (en) | Power supply cabinet for train | |
| WO2022193854A1 (en) | Photovoltaic system, photovoltaic assembly, local manager and photovoltaic system operation method | |
| WO2022193458A1 (en) | Photovoltaic system, photovoltaic assembly, local manager and photovoltaic system operation method | |
| KR102621614B1 (en) | Smart junction box and the operating method | |
| CN206628890U (en) | Emergency power supply control system based on sequential control | |
| CN215221791U (en) | Energy storage system | |
| CN106849352A (en) | Converter valve Control protection system comprising light modulation communication module | |
| EP4057464A1 (en) | The connecting an array of extra low dc voltage sources |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |