CN208479192U - Photovoltaic module string cutoff device and photovoltaic system - Google Patents
Photovoltaic module string cutoff device and photovoltaic system Download PDFInfo
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- CN208479192U CN208479192U CN201821338741.0U CN201821338741U CN208479192U CN 208479192 U CN208479192 U CN 208479192U CN 201821338741 U CN201821338741 U CN 201821338741U CN 208479192 U CN208479192 U CN 208479192U
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Abstract
The utility model provides a kind of photovoltaic module string cutoff device and photovoltaic system.For the photovoltaic module string cutoff device for controlling photovoltaic module string connected to it in photovoltaic system, the photovoltaic module string includes at least two photovoltaic modulies being cascaded.The photovoltaic module string cutoff device includes switch unit, voltage detection unit and voltage comparison unit；The switch unit is used to detect the busbar voltage of photovoltaic component string for turning off photovoltaic module string corresponding with opening, the voltage detection unit, and the busbar voltage that the voltage comparison unit is used to will test is compared with reference voltage and exports feedback signal.Compared to the prior art, the photovoltaic module string cutoff device of the utility model and photovoltaic system have compared with high performance-price ratio and can reduce energy consumption.
Description
Technical field
The utility model relates to technical field of photovoltaic power generation more particularly to a kind of photovoltaic module string cutoff device and photovoltaic systems
System.
Background technique
Solar energy is that the mankind can as a kind of low-carbon renewable energy, not only resourceful, no pollution to the environment
The energy freely utilized, therefore solar energy becomes the focus that people pay attention to its exclusive advantage.Photovoltaic power generation is as solar energy
It is most widely used in society now and is widelyd popularize, installation increases year by year.Distributed photovoltaic power generation system refers to
Existing match is supported close to the lesser photovoltaic generating system of electricity consumption situ configuration to meet the needs of specific user in electricity consumption scene
The economical operation of power grid, or meet the requirement in terms of the two simultaneously.
Distributed photovoltaic power generation system is typically mounted on building roof, since photovoltaic generating system is set as a kind of electrification
It is standby, always with the presence of electric current in internal and circuit.When fire occurs for building, it is timely that the presence of electric current will affect fire fighter
It sues and labours.With the continuous expansion of photovoltaic industry, the probability that accident occurs also is being continuously increased.At the same time, how photovoltaic is sent out
Electric system, which carries out the intelligent operations such as the monitoring of intelligence, control access and disconnection, to be also a direction of current industry development and becomes
Gesture.Therefore in order to improve the safety of photovoltaic system, photovoltaic system is proposed quickly to close in NEC2017 (U.S.'s electrician's bill 2017)
The requirement of disconnected (RS, Rapid Shutdown).
Existing shutdown mode is that a Quick shut-off device, higher cost are accessed on each photovoltaic module；Furthermore
In normal power generation, the switch of the corresponding multiple Quick shut-off devices of multiple photovoltaic modulies will form series connection, generate biggish leads
Logical loss, then influences the generating efficiency of photovoltaic module.
In view of this, rapidly switching off solution party it is necessory to what is proposed a kind of high performance-price ratio, meet NEC2017 standard requirements
Case, to solve the above problems.
Utility model content
The purpose of this utility model is to provide a kind of photovoltaic module string cutoff device and photovoltaic system, the photovoltaic module strings
Cutoff device and photovoltaic system can effectively improve the generating efficiency of photovoltaic module and reduce energy consumption, while have high sexual valence
Than.
To achieve the above object, the utility model provides a kind of photovoltaic module string cutoff device, in photovoltaic system
Middle control photovoltaic module string connected to it, the photovoltaic module string includes at least two photovoltaic modulies being cascaded；Institute
Stating photovoltaic module string cutoff device includes switch unit, voltage detection unit and voltage comparison unit；The switch unit and institute
It states voltage detection unit to be arranged in parallel, the switch unit is for turning off photovoltaic module string corresponding with opening, the voltage inspection
The busbar voltage that unit is used to detect photovoltaic component string is surveyed, the busbar voltage and base that the voltage comparison unit is used to will test
Quasi- voltage is compared and exports feedback signal.
The switch unit includes at least two first of setting parallel with one another as a further improvement of the utility model,
Switch, one end of the first switch connect the anode of first photovoltaic module of the photovoltaic module string anode, other end connection
The negative terminal of first photovoltaic module of the photovoltaic module string negative terminal.
As a further improvement of the utility model, the first switch be MOSFET, IGBT, relay or it is silicon-controlled in
One kind.
The voltage detection unit is by divider resistance to photovoltaic module string as a further improvement of the utility model,
Busbar voltage is detected；The voltage comparison unit is comparator or NPN triode.
The photovoltaic module string cutoff device further includes isolation conversion module as a further improvement of the utility model,
The isolation conversion module is used to provide isolated power supply to the switch unit.
The utility model additionally provides a kind of photovoltaic system, and the photovoltaic system includes at least one aforementioned photovoltaic module string
Cutoff device, at least one photovoltaic module string corresponding with photovoltaic module string cutoff device, control device and at least one inversion
Device, the photovoltaic module string, photovoltaic module string cutoff device and inverter are connected by one group of bus, and the photovoltaic module string
Cutoff device is arranged in parallel between photovoltaic module string and inverter, and the control device is used to turn off to the photovoltaic module string
Device issues instruction, and the photovoltaic module string cutoff device turns off photovoltaic module string corresponding with opening according to instruction.
As a further improvement of the utility model, the photovoltaic system include an inverter, an inverter with
At least one photovoltaic module string and corresponding at least one photovoltaic module string cutoff device connection.
The photovoltaic system includes at least two inverters, at least two light as a further improvement of the utility model,
Lie prostrate component string and corresponding at least two photovoltaic modulies string cutoff device, each inverter at least one photovoltaic module string and
At least one corresponding photovoltaic module string cutoff device connects, and passes through bus between photovoltaic module string cutoff device and is connected in series.
The control device includes input power, is connected with input power as a further improvement of the utility model,
Second switch and indicating unit, the input power are used to power for instruction, and the indicating unit is used in shutdown photovoltaic module
The feedback signal that the photovoltaic module string cutoff device issues is received when string and is indicated.
The second switch includes manual switch and motor switch, the hand as a further improvement of the utility model,
Dynamic switch is arranged in parallel with the motor switch, and the control device further includes drive module, one end of the drive module and
Input power is connected, the other end is connected with motor switch.
The motor switch is relay or PMOS tube as a further improvement of the utility model,.
The drive module is for bypass diode or by resistance and tri- pole NPN as a further improvement of the utility model,
Pipe composition.
The beneficial effects of the utility model are: the photovoltaic module string cutoff device of the utility model can control one simultaneously
The shutdown of multiple photovoltaic modulies in photovoltaic module string avoids each photovoltaic module in the prior art and is required to a corresponding pass
Disconnected device reduces the control cost of photovoltaic module string to reduce the quantity of cutoff device, and further reduced photovoltaic
The energy loss of system.
Detailed description of the invention
Fig. 1 is the schematic diagram of the photovoltaic system embodiment one of the utility model.
Fig. 2 is the concrete structure schematic diagram of photovoltaic module string cutoff device in Fig. 1.
Fig. 3 is the schematic diagram of the embodiment one of control device in Fig. 1.
Fig. 4 is the schematic diagram of the embodiment two of control device in Fig. 1.
Fig. 5 is the schematic diagram of the embodiment three of control device in Fig. 1.
Fig. 6 is the schematic diagram of the example IV of control device in Fig. 1.
Fig. 7 is the schematic diagram of the embodiment five of control device in Fig. 1.
Fig. 8 is the schematic diagram of the embodiment six of control device in Fig. 1.
Fig. 9 is the schematic diagram of the photovoltaic system embodiment two of the utility model.
Figure 10 is the schematic diagram of the photovoltaic system embodiment three of the utility model.
Figure 11 is the schematic diagram of the photovoltaic system example IV of the utility model.
Figure 12 is the schematic diagram of the photovoltaic system embodiment five of the utility model.
Specific embodiment
In order to keep the purpose of this utility model, technical solution and advantage clearer, with reference to the accompanying drawing and it is embodied
The utility model is described in detail in example.
The utility model provides a kind of photovoltaic module string cutoff device and the light using the photovoltaic module string cutoff device
Volt system, the photovoltaic module string cutoff device can be applied to roof class photovoltaic plant, especially commercial roof and unobstructed family
Use roof photovoltaic power station.The photovoltaic system specifically include that photovoltaic module string, photovoltaic module string cutoff device, control device and
Inverter, and photovoltaic system tool, there are five types of embodiment, following description part will carry out five kinds of embodiments detailed
Description.
Refering to Figure 1, the schematic diagram of the embodiment one for photovoltaic system provided by the utility model.The photovoltaic system
It unites including a photovoltaic module string cutoff device 10, a photovoltaic module string corresponding with photovoltaic module string cutoff device 10 (not
Label), a control device 20 and an inverter 30, be suitable for single group string list array photovoltaic system.The photovoltaic module string
Cutoff device 10 is switched on or off for controlling coupled photovoltaic module string.The control device 20 and photovoltaic module string
Cutoff device 10 is connected, and instructs for issuing to photovoltaic module string cutoff device 10；Described photovoltaic module string cutoff device 10
Photovoltaic module string corresponding with opening is turned off according to instruction, and exports feedback signal to control device after the shutdown of photovoltaic module string
20。
The photovoltaic module string includes at least two photovoltaic modulies being cascaded.The photovoltaic module string, photovoltaic group
Part string cutoff device 10 and inverter 30 are connected by one group of bus (LN1, LN2), and the photovoltaic module string cutoff device 10
It is arranged in parallel between photovoltaic module string and inverter 30；That is: the anode of photovoltaic module string passes through bus LN1 and 30 phase of inverter
Even, the cathode of photovoltaic module string is connected by bus LN2 with inverter 30, and photovoltaic module string cutoff device 10 is located at photovoltaic module
Between string and inverter 30, and the both ends of photovoltaic module string cutoff device 10 are connected with bus LN1 and bus LN2 respectively.
Fig. 2 and as shown in connection with fig. 1 is please referred to, the photovoltaic module string cutoff device 10 includes switch unit, voltage detecting
Unit and voltage comparison unit；The switch unit is arranged in parallel with the voltage detection unit.The voltage detection unit is used
In the busbar voltage of detection photovoltaic component string, and particular by divider resistance between the bus LN1 and LN2 of photovoltaic module string
Voltage detected.The busbar voltage that the voltage comparison unit is used to will test is compared and exports with reference voltage
Feedback signal is to control device 20；Preferably, the voltage comparison unit is comparator or NPN triode.
The switch unit includes at least two first switches of setting parallel with one another, one end connection of the first switch
The anode of photovoltaic module string first photovoltaic module of anode, the other end of first switch connect first light of photovoltaic module string negative terminal
Lie prostrate the cathode of component.At least two first switches are designed to mode in parallel, mainly in view of in Unite States Standard UL1741
Requirement to single failure, even if one of first switch disconnects failure after in parallel, photovoltaic module string cutoff device 10 is still
Photovoltaic system can be kept in a safe condition by another first switch short circuit.
By taking two first switches shown in Fig. 2 as an example, be illustrated: two first switches are respectively switch S1 and open
Close S2, switch S1 and switch S2 can be MOSFET, IGBT, relay or it is silicon-controlled in any one；Voltage detection unit
By being detected after 2 electric resistance partial pressures to the voltage between the bus LN1 and LN2 of photovoltaic module string, then will test
Busbar voltage is sent to voltage comparison unit and is compared；Voltage comparison unit is comparator 11, and comparator 11 is by busbar voltage
It is compared with reference voltage Vref (such as 30V), and comparison result is sent to control device 20 in a manner of feedback signal；When
When busbar voltage is higher than 30V, feedback signal is low level, and when busbar voltage is lower than 30V, feedback signal is high level.
Certainly, comparator 11 can also be substituted for NPN triode, the busbar voltage that voltage detection unit will test at this time
It is sent to the base stage of NPN triode, when busbar voltage is higher than 30V, feedback signal is low level, when busbar voltage is lower than 30V
When, feedback signal is high level.
For single group string turning off system, the photovoltaic module string cutoff device 10 only passes through above-mentioned switch unit, electricity
Detection unit and voltage comparison unit are pressed, that is, coupled photovoltaic module string can control to be switched on or off.
When photovoltaic module string have it is multiple when, photovoltaic module string cutoff device 10 be also correspondingly arranged it is multiple, at this time i.e. constitute
Multiple groups string turning off system (such as Fig. 9).For multiple groups string turning off system, not due to multiple photovoltaic module string cutoff devices 10
Altogether, it is therefore desirable to corresponding switch S1 and S2 is driven using isolated power supply, at this time the photovoltaic module string cutoff device 10
It should also include isolation conversion module, the isolation conversion module is used to provide isolated power supply to switch S1 and switch S2, specifically such as
Shown in Fig. 2.
It please refers to shown in Fig. 3, the control device 20 includes input power, the second switch being connected with input power and refers to
Show unit.The input power is used for as instruction power supply (i.e. triggering driving power signal VCC-1 and VCC-2)；Described second opens
Close the sending for being used for control instruction；The indicating unit is for receiving the photovoltaic module string shutdown when turning off photovoltaic module string
The feedback signal of the sending of device 10 is simultaneously indicated.The input power includes DC power supply (DC1 and DC2) and battery supply.
The indicating unit is LED light, is selectively lighted according to the feedback signal that photovoltaic module string cutoff device 10 issues.
Because the triggering mode of control device 20 includes the manual triggering mode of emergency stop switch and AC dump automatic trigger mode,
Therefore the second switch includes manual switch K and motor switch, the manual switch K is arranged in parallel with the motor switch, with
Convenient autonomous selection triggers manually or automatic trigger.The motor switch is relay or PMOS.The control device 20 is also
Including drive module, one end of the drive module is connected with DC power supply, the other end is connected with motor switch.The driving mould
Block can be bypass diode, can also be made of resistance and NPN triode.
Fig. 3 show one schematic diagram of embodiment of control device 20, and in the present embodiment, motor switch is the relay of closed type
Device, drive module are bypass diode.When selecting manual trigger control device 20, under original state, DC power supply DC1 and
DC2 is normally inputted, and manual switch K is disconnected, photovoltaic system normal power generation；Under emergency, manual switch K closure, control device
20 issue instructions to photovoltaic module string cutoff device 10；After emergency releases, manual switch K is disconnected, and photovoltaic system can be normal
Work.
When selecting automatic trigger control device 20, the direct triggering mode of relay, DC power supply DC1 and DC2 can be used
Driving power is provided for the input winding of relay, when relay primary has electricity, relay secondary is disconnected, and photovoltaic system is normal
Power generation；When relay primary is without electricity, relay secondary conducting, control device 20 can issue instructions to the shutdown of photovoltaic module string
Device 10.
Fig. 4 show two schematic diagram of embodiment of control device 20.Compared with embodiment one shown in Fig. 3, difference only exists
In: in the present embodiment, DC power supply is converted by AC power source AC1 and AC2 through AC/DC conversion module (AC/DC).Other
Structure is identical as one whole of embodiment, and so it will not be repeated.
Fig. 5 show three schematic diagram of embodiment of control device 20.Compared with embodiment one shown in Fig. 3, difference is:
1, the automatic trigger mode that the present embodiment three uses is the indirect triggering mode of relay；2, drive module is by tri- pole of resistance and NPN
Pipe composition.At this point, the primary driving power of relay is battery supply (12V battery), DC power supply DC1 and DC2 are for triggering
Driving power signal VCC-1 and VCC-2.
Specifically, when relay primary has electricity, relay secondary is disconnected, photovoltaic system normal power generation；Work as relay
When primary is without electricity, the conducting of relay secondary, DC power supply DC1 and DC2 trigger NPN triode conducting, and then control relay and lead
Logical, control device 20 can issue instructions to photovoltaic module string cutoff device 10.
Other structures are basically the same as the first embodiment, and so it will not be repeated.
Fig. 6 show the example IV schematic diagram of control device 20.Compared with embodiment three shown in fig. 5, difference only exists
In: in the present embodiment, DC power supply is converted by AC power source AC1 and AC2 through AC/DC conversion module (AC/DC).Other
Structure is identical as three whole of embodiment, and so it will not be repeated.
Fig. 7 show five schematic diagram of embodiment of control device 20.Compared with embodiment one shown in Fig. 3, difference is:
1, the motor switch of the present embodiment five is PMOS；2, the automatic trigger mode that the present embodiment five uses is the side of triggering indirectly PMOS
Formula；3, drive module can be selected arbitrarily, be not limited to bypass diode, as long as can be realized driving function.At this point,
The driving power of PMOS is battery supply, and DC power supply DC1 and DC2 are for triggering driving power signal VCC-1 and VCC-2.
Specifically, in the presence of having battery supply, PMOS is disconnected, photovoltaic system normal power generation；When battery supply is not deposited
When, PMOS conducting, DC power supply DC1 and DC2 triggering driving circuit PMOS is connected, control device 20 can issue instructions to
Photovoltaic module string cutoff device 10.
Other structures are basically the same as the first embodiment, therefore are no longer described.
Fig. 8 show six schematic diagram of embodiment of control device 20.Compared with embodiment five shown in Fig. 7, difference only exists
In: in the present embodiment, DC power supply is converted by AC power source AC1 and AC2 through AC/DC conversion module (AC/DC).Other
Structure is identical as five whole of embodiment, and so it will not be repeated.
In conjunction with shown in Fig. 1 to Fig. 8, the shutdown principle of photovoltaic system are as follows: when initial, control device 20 does not issue instruction (i.e.
Driving power signal VCC-1 and VCC-2 are not triggered), switch S1 and switch S2 in photovoltaic module string cutoff device 10 keep opening
Line state, busbar voltage normally export, 30 normal power generation of inverter；When there is emergency (such as fire), control device 20
Issue instruction (i.e. triggering driving power signal VCC-1 and VCC-2), after photovoltaic module string cutoff device 10 receives instruction, switch
S1 and switch S2 closure short circuit, voltage detection unit detects busbar voltage at this time and the busbar voltage that will test is sent
It is compared to comparator 11 (or NPN triode), if busbar voltage is lower than 30V, comparator 11 (or NPN triode) is issued
High level signal is to control device 20, if busbar voltage is higher than 30V, comparator 11 (or NPN triode) issues low level letter
Number give control device 20；After control device 20 receives high level signal, LED light, which lights, to be represented photovoltaic system and successfully closes
Disconnected safety (i.e. outside Fig. 1 dashed boundaries between any two conducting wires and over the ground between voltage be less than 30V, foreign current be less than 8A and
240VA, in dashed boundaries between any two conducting wires and over the ground between voltage be less than 80V, meet wanting for Unite States Standard NEC2017
It asks)；After emergency releases, control device 20 stops sending the switch S1 instructed, in photovoltaic module string cutoff device 10 and open
It closes S2 to disconnect, busbar voltage is restored, and inverter 30 is reworked.
It should be understood that LED light will not light after control device 20 receives low level signal, photovoltaic is represented
System is dangerous, reminds staff with this, avoids accident occurs because of maloperation.
It please refers to shown in Fig. 9, is the schematic diagram of photovoltaic system embodiment two provided by the utility model.With it is shown in FIG. 1
Photovoltaic system embodiment one is compared, photovoltaic system provided in this embodiment include at least two photovoltaic module string cutoff devices 10,
At least two photovoltaic module strings, a control device 20 and an inverter 30, each photovoltaic module string cutoff device 10 are right
A photovoltaic module string is answered, which closes at least two photovoltaic module strings and corresponding at least two photovoltaic modulies string
Disconnected device 10 connects, and is suitable for multiple groups string list array single inverter photovoltaic system.
The shutdown principle of the photovoltaic system of the present embodiment and the shutdown principle of photovoltaic system embodiment one are essentially identical, are all
It issues an instruction to switch S1 and S2 in control photovoltaic module string cutoff device 10 by control device 20 to be opened or closed, with this
It is switched on or off to control corresponding photovoltaic module string.
It is to be noted that in the present embodiment, by bus with hand-in-hand side between photovoltaic module string cutoff device 10
Formula is connected in series, and is connected between control device 20 and photovoltaic module string cutoff device 10 also by bus.By taking Fig. 9 as an example: assuming that
There are three 10 settings of shutdown setting, respectively the first photovoltaic module string cutoff device 101, the second photovoltaic module string cutoff device
102 and third photovoltaic module string cutoff device 103, wherein the first photovoltaic module string cutoff device 101 is set close to control device 20
It sets, third photovoltaic module string cutoff device 103 is arranged far from control device 20, the second photovoltaic module string cutoff device 102 is located at
Between first photovoltaic module string cutoff device 101 and third photovoltaic module string cutoff device 103.Each photovoltaic module string shutdown dress
10 are set to be all provided with there are two interface, respectively first interface and second interface；At this point, the first photovoltaic module string cutoff device 101
First interface is connected by bus with control device 20, and the second interface of the first photovoltaic module string cutoff device 101 passes through bus
It is connected with the first interface of the second photovoltaic module string cutoff device 102, the second interface of the second photovoltaic module string cutoff device 102
It is connected by bus with the first interface of third photovoltaic module string cutoff device 103；In this way, foring two neighboring photovoltaic module
It is connected in series in a manner of hand-in-hand between string cutoff device 10 by bus.Driving power signal can be carried out in the bus
The transmission for the feedback signal that VCC-1 and VCC-2, ground signalling GND and photovoltaic module string cutoff device 10 issue, that is to say, that hand
The signal of knob is respectively VCC-1, VCC-2, GND and feedback signal.
Because being connected in series in a manner of hand-in-hand between photovoltaic module string cutoff device 10 by bus, to pass through one
Control device 20 can control the conducting and shutdown of multiple photovoltaic module string cutoff devices 10 simultaneously, then control corresponding photovoltaic
Component string is switched on or off, and structure is simple, is convenient for control.
It please refers to shown in Figure 10, is the schematic diagram of photovoltaic system embodiment three provided by the utility model.With it is shown in Fig. 9
Photovoltaic system embodiment two is compared, and the main distinction is: the quantity of inverter 30 is increased, so that the mode of centerized fusion is same
Sample is suitable for multiple groups string list array multi-inverter photovoltaic system.Specifically, the photovoltaic system include at least two inverters 30,
At least two photovoltaic module strings and corresponding at least two photovoltaic modulies string cutoff device 10, each inverter 30 is at least one
A photovoltaic module string and at least one corresponding photovoltaic module string cutoff device 10 connect, and lead between photovoltaic module string cutoff device 10
Cross bus series connection.
It please refers to shown in Figure 11, is the schematic diagram of photovoltaic system example IV provided by the utility model.With it is shown in Fig. 9
Photovoltaic system embodiment two is compared, and the main distinction is: will be by a photovoltaic module string and a photovoltaic module string cutoff device
Long group of string for 10 compositions is divided into several short groups and carries out string fault control respectively, is suitable for the more array single inverter light of multiple groups string
Volt system meets the requirement of Unite States Standard NEC2017.Specifically, the photovoltaic system includes an inverter 30, at least four
Photovoltaic module string and corresponding at least four photovoltaic modulies string cutoff device 10, an inverter 30 and at least four photovoltaic groups
Part string and corresponding at least four photovoltaic module string cutoff devices 10 connect, and pass through bus string between photovoltaic module string cutoff device 10
Connection connection.
It please refers to shown in Figure 12, is the schematic diagram of photovoltaic system embodiment five provided by the utility model.With shown in Figure 11
Photovoltaic system example IV compare, the main distinction is: increase the quantity of inverter 30, be suitable for the more arrays of multiple groups string
Multi-inverter photovoltaic system.Specifically, the photovoltaic system include at least two inverters 30, at least four photovoltaic module strings and
Corresponding at least four photovoltaic modulies string cutoff device 10, each inverter 30 at least two photovoltaic module strings and it is corresponding extremely
Few two photovoltaic module string cutoff devices 10 connect, and are connected in series between photovoltaic module string cutoff device 10 by bus.
Certainly, the more array photovoltaic systems of multiple groups string, mainly basis are still used using multiple groups string list array photovoltaic system
Depending on actual conditions.For example, Chinese architecture mostly uses multiple groups string list array photovoltaic system, and European Architecture mostly uses multiple groups string
More array photovoltaic systems.
In conclusion the photovoltaic system of the utility model, it only can be simultaneously with a photovoltaic module string cutoff device 10
Control the shutdown of multiple photovoltaic modulies, it is not necessary to as each photovoltaic module in the prior art is required to a corresponding photovoltaic module string
Therefore cutoff device reduces the quantity of photovoltaic module string cutoff device, reduce the control cost of photovoltaic module string；And
Energy consumption when photovoltaic system works normally is reduced to a certain extent, is suitble to Built hydropower station and is newly built a power station.
Above embodiments are merely intended for describing the technical solutions of the present application, but not for limiting the present application, although referring to preferred embodiment pair
The utility model is described in detail, those skilled in the art should understand that, it can be to the technology of the utility model
Scheme is modified or replaced equivalently, without departing from the spirit and scope of the technical scheme of the present invention.
Claims (12)
1. a kind of photovoltaic module string cutoff device, for controlling photovoltaic module string connected to it, the light in photovoltaic system
Lying prostrate component string includes at least two photovoltaic modulies being cascaded；It is characterized by: the photovoltaic module string cutoff device packet
Include switch unit, voltage detection unit and voltage comparison unit；The switch unit is arranged in parallel with the voltage detection unit,
The switch unit is for turning off photovoltaic module string corresponding with opening, and the voltage detection unit is for detecting photovoltaic component string
Busbar voltage, the voltage comparison unit is used for the busbar voltage that will test and is compared with reference voltage and exports feedback
Signal.
2. photovoltaic module string cutoff device according to claim 1, it is characterised in that: the switch unit includes mutually simultaneously
Join at least two first switches of setting, one end of the first switch connects described first photovoltaic group of photovoltaic module string anode
Anode, the other end of part connect the negative terminal of first photovoltaic module of the photovoltaic module string negative terminal.
3. photovoltaic module string cutoff device according to claim 2, it is characterised in that: the first switch be MOSFET,
IGBT, relay or one of silicon-controlled.
4. photovoltaic module string cutoff device according to claim 1, it is characterised in that: the voltage detection unit is by dividing
Piezoresistance detects the busbar voltage of photovoltaic module string；The voltage comparison unit is comparator or NPN triode.
5. photovoltaic module string cutoff device according to claim 1, it is characterised in that: the photovoltaic module string cutoff device
It further include isolation conversion module, the isolation conversion module is used to provide isolated power supply to the switch unit.
6. a kind of photovoltaic system, it is characterised in that: the photovoltaic system includes described at least one claim 1-5 any one
Photovoltaic module string cutoff device, at least one photovoltaic module string corresponding with photovoltaic module string cutoff device, control device and
At least one inverter, the photovoltaic module string, photovoltaic module string cutoff device and inverter are connected by one group of bus, and institute
It states photovoltaic module string cutoff device to be arranged in parallel between photovoltaic module string and inverter, the control device is used for the light
It lies prostrate component string cutoff device and issues instruction, the photovoltaic module string cutoff device turns off photovoltaic group corresponding with opening according to instruction
Part string.
7. photovoltaic system according to claim 6, it is characterised in that: the photovoltaic system includes an inverter, this one
A inverter is connected at least one photovoltaic module string and at least one corresponding photovoltaic module string cutoff device.
8. photovoltaic system according to claim 6, it is characterised in that: the photovoltaic system include at least two inverters,
At least two photovoltaic module strings and corresponding at least two photovoltaic modulies string cutoff device, each inverter at least one light
Component string and corresponding at least one photovoltaic module string cutoff device connection are lied prostrate, passes through bus string between photovoltaic module string cutoff device
Connection connection.
9. photovoltaic system according to claim 6, it is characterised in that: the control device includes input power and input
Power supply connected second switch and indicating unit, the input power are used to power for instruction, and the indicating unit is for closing
The feedback signal that the photovoltaic module string cutoff device issues is received when disconnected photovoltaic module string and is indicated.
10. photovoltaic system according to claim 9, it is characterised in that: the second switch includes manual switch and electronic
Switch, the manual switch are arranged in parallel with the motor switch, and the control device further includes drive module, the driving mould
One end of block is connected with input power, the other end is connected with motor switch.
11. photovoltaic system according to claim 10, it is characterised in that: the motor switch is relay or PMOS tube.
12. photovoltaic system according to claim 10, it is characterised in that: the drive module is for bypass diode or by electricity
Resistance is formed with NPN triode.
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| CN201821338741.0U CN208479192U (en) | 2018-08-20 | 2018-08-20 | Photovoltaic module string cutoff device and photovoltaic system |
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| CN201821338741.0U CN208479192U (en) | 2018-08-20 | 2018-08-20 | Photovoltaic module string cutoff device and photovoltaic system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110299727A (en) * | 2019-07-09 | 2019-10-01 | 海宁昱能电子有限公司 | A kind of component switching off device and photovoltaic generating system safety system |
| CN113270893A (en) * | 2021-06-22 | 2021-08-17 | 阳光电源股份有限公司 | Photovoltaic turn-off system control method and application system thereof |
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2018
- 2018-08-20 CN CN201821338741.0U patent/CN208479192U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110299727A (en) * | 2019-07-09 | 2019-10-01 | 海宁昱能电子有限公司 | A kind of component switching off device and photovoltaic generating system safety system |
| US11881813B2 (en) | 2019-07-09 | 2024-01-23 | Altenergy Power System Inc. | Module switchoff device and security protection system of photovoltaic power generation system |
| CN113270893A (en) * | 2021-06-22 | 2021-08-17 | 阳光电源股份有限公司 | Photovoltaic turn-off system control method and application system thereof |
| CN113270893B (en) * | 2021-06-22 | 2024-04-12 | 阳光电源股份有限公司 | Photovoltaic shutdown system control method and application system thereof |
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Address after: No. 199, Lushan Road, Suzhou hi tech Zone, Suzhou City, Jiangsu Province Patentee after: CSI Cells Co.,Ltd. Patentee after: Changshu Artes Sunshine Power Technology Co.,Ltd. Patentee after: Atlas sunshine Power Group Co.,Ltd. Address before: No. 199, Lushan Road, Suzhou hi tech Zone, Suzhou City, Jiangsu Province Patentee before: CSI Cells Co.,Ltd. Patentee before: Changshu Artes Sunshine Power Technology Co.,Ltd. Patentee before: CSI SOLAR POWER GROUP Co.,Ltd. |
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