CN115473491A - Photovoltaic system, local manager and self-checking method of photovoltaic system - Google Patents

Photovoltaic system, local manager and self-checking method of photovoltaic system Download PDF

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Publication number
CN115473491A
CN115473491A CN202110648807.6A CN202110648807A CN115473491A CN 115473491 A CN115473491 A CN 115473491A CN 202110648807 A CN202110648807 A CN 202110648807A CN 115473491 A CN115473491 A CN 115473491A
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China
Prior art keywords
voltage
local manager
control state
photovoltaic module
photovoltaic
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CN202110648807.6A
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Chinese (zh)
Inventor
许涛
徐洁
夏正月
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Canadian Solar Inc
CSI Cells Co Ltd
Canadian Solar Manufacturing Changshu Inc
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CSI Cells Co Ltd
Canadian Solar Manufacturing Changshu Inc
Atlas Sunshine Power Group Co Ltd
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Application filed by CSI Cells Co Ltd, Canadian Solar Manufacturing Changshu Inc, Atlas Sunshine Power Group Co Ltd filed Critical CSI Cells Co Ltd
Priority to CN202110648807.6A priority Critical patent/CN115473491A/en
Publication of CN115473491A publication Critical patent/CN115473491A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/12—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to undesired approach to, or touching of, live parts by living beings

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  • Engineering & Computer Science (AREA)
  • Artificial Intelligence (AREA)
  • Evolutionary Computation (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The invention provides a photovoltaic system, a local manager and a self-checking method of the photovoltaic system, wherein the photovoltaic system comprises a photovoltaic module, a local manager, a main controller and an inverter, the inverter is electrically connected with the photovoltaic module 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, 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 the photovoltaic module is controlled 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 and 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 function of periodic self-checking, and have high safety and low maintenance cost.

Description

Photovoltaic system, local manager and self-checking method of photovoltaic system
Technical Field
The invention relates to the field of solar components, in particular to a photovoltaic system, a local manager and a self-checking method of the photovoltaic system.
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 have 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.
Disclosure of Invention
The invention 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 invention, 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, 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 the first voltage or the 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.
The invention also aims to provide a local manager, which is applied to the photovoltaic system.
The invention also aims to provide a self-checking method of the photovoltaic system, which can quickly judge the control effectiveness of the local manager and the main controller and realize the function of periodic self-checking.
In order to achieve the above object, the present invention provides a self-inspection method of a photovoltaic system, which is applied to the photovoltaic system, and the self-inspection method of the photovoltaic system mainly includes 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 the first control state and the second control state;
and 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 a monitoring platform of the terminal.
As a further improvement of the present invention, after monitoring that the photovoltaic module outputs the first voltage, the voltage monitoring device compares a monitoring result with a first preset value, and determines whether the communication between the main controller and the local manager is normal according to the comparison result; and after monitoring a second voltage output by the photovoltaic module, the voltage monitoring device compares a monitoring result with a second preset value and judges whether the communication between the main controller and the local manager is normal or not according to the comparison result.
As a further improvement of the present invention, 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.
As a further improvement of the present invention, the voltage monitoring device periodically or in real time monitors the first voltage/the second voltage output by the photovoltaic module in the first control state/the second control state.
The invention has the beneficial effects that: the photovoltaic system is low in cost and high in safety, and circuits in the photovoltaic system can be cut off 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. 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, the function of periodic self-checking is achieved, 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 invention.
Fig. 3 is a flow chart of a self-test method of a photovoltaic system according to another preferred embodiment of the invention.
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 number of the main controllers is one, the main controllers are arranged in the inverters to serve as one component or one function of the inverters, and each local manager is in communication connection with the main controllers through a wireless network or a PLC so as to receive signals sent by the main controllers. 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 time points T1 and T2 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 of 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.
The above-mentioned "setting time period" may be set to: the local manager receives any one time point from T1 to T2 after the main controller sends out an operation permission signal; the "unset period" is set to: not between any of the time points T1 to T2 of the enable signal, where T2 is later than T1.
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 allowable operation signal 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 from T1 to T2 after receiving each operation permission signal sent by the main controller, so that the photovoltaic module outputs normal voltage to the inverter; and when the photovoltaic module is not between any time point T1 and T2 of the operation allowing signal, the local manager disconnects the photovoltaic module from the main line or reduces the output voltage of the photovoltaic module.
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 time points 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 time point and the non-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 is 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 cannot receive the operation permission signal in the non-set time period (namely, between the non-T1 time point and the non-T2 time point), the local manager enters a second control state, the switch is controlled to be turned on, the photovoltaic module is disconnected with the main line, and the second voltage is zero at the moment.
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 turned on, at the moment, the photovoltaic module can be connected to a 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 cannot receive the operation permission signal in the non-set time period (namely, between the non-T1 time point and the non-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, the photovoltaic module outputs second voltage to the inverter, and 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 time points T1 and 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 non-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, 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 main controller sends out an operation permission signal, the local manager receives the operation permission signal sent by the main controller within a set time period (for example, between time points T1 and T2 after each operation permission signal sent by the main 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 in a non-set time period (not between the time points of 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 a first control state to a second control state, and the voltage monitoring device monitors a 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 thereof is identical to 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 safe voltage of a human body, and a constructor is 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 (12)

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 module, 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 module so that the photovoltaic module 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, the signal receiving end is used for receiving signals sent by the main controller, and the local manager enters the first control state or the second control state according to the signals and then controls the voltage regulating device to operate so that the photovoltaic module outputs the first voltage or the second voltage.
8. A local manager, characterized by: application to a photovoltaic system according to any one of claims 1 to 7.
9. A self-checking method of a photovoltaic system is applied to the photovoltaic system of any one of claims 1 to 7, 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 the first control state and the second control state;
and 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 a monitoring platform of the terminal.
10. The self-test method of a photovoltaic system according to claim 9, characterized in that: after monitoring that the photovoltaic module outputs a first voltage, the voltage monitoring device compares a monitoring result with a first preset value and judges whether the communication between the main controller and the local manager is normal or not according to the comparison result; and after monitoring that the photovoltaic module outputs a second voltage, the voltage monitoring device compares a monitoring result with a second preset value and judges whether the communication between the main controller and the local manager is normal or not according to the comparison result.
11. The self-test method of a photovoltaic system according to claim 9, characterized in that: and 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 is changed.
12. The self-test method of a photovoltaic system according to claim 9, characterized in that: the voltage monitoring device monitors first voltage/second voltage output by the photovoltaic module in the first control state/the second control state periodically or in real time.
CN202110648807.6A 2021-06-10 2021-06-10 Photovoltaic system, local manager and self-checking method of photovoltaic system Pending CN115473491A (en)

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