CN209344804U - Photovoltaic combining inverter - Google Patents
Photovoltaic combining inverter Download PDFInfo
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- CN209344804U CN209344804U CN201822071722.2U CN201822071722U CN209344804U CN 209344804 U CN209344804 U CN 209344804U CN 201822071722 U CN201822071722 U CN 201822071722U CN 209344804 U CN209344804 U CN 209344804U
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
This application provides a kind of photovoltaic combining inverter, which includes first capacitor circuit, the first filter circuit, the second condenser network, first switch circuit, second switch circuit and DC/AC circuit.The anode of first capacitor circuit and photovoltaic array connects.First filter circuit is electrically connected with the anode of photovoltaic array.Second condenser network is electrically connected with the first filter circuit.First switch circuit is electrically connected with the first filter circuit.Second switch circuit is electrically connected with first switch circuit.DC/AC circuit is electrically connected with the zero curve of the first filter circuit, the second condenser network, second switch circuit, first capacitor circuit, first switch circuit, the cathode of photovoltaic array and power grid respectively.The output end of DC/AC circuit is electrically connected with the firewire of power grid.The photovoltaic combining inverter of the application eliminates the common-mode voltage between photovoltaic array and power grid, to avoid generating common mode current, and then substantially increases security performance.
Description
Technical field
This application involves technical field of photovoltaic power generation, more particularly to photovoltaic combining inverter.
Background technique
Currently, the inverter that photovoltaic industry uses is promoted by DC/DC conversion (DC voltage conversion dc voltage)
Or the voltage of input is reduced, its output is adjusted to realize maximum efficiency.After by some additional voltage buffers, left side
Usually by the switching frequency of 18~20khz in electric bridge, D/C voltage is converted to AC voltage.In general, single-phase h bridge be direct current/
The common configuration for exchanging grade, can also use three-phase and other configurations.Grid-connected photovoltaic is used for finally, generating by low-pass filter
The simple alternating current electricity output of electricity generation system.
Since traditional photovoltaic combining inverter has the HF switch movement of switching device when in use, can generate to big
The common-mode voltage on ground.It is influenced by factors such as the area of photovoltaic battery panel, structure, environment and its mounting means, photovoltaic battery panel battle array
It arranges and there is the distribution capacity for being about 50~200nF/kWp to the earth.Due to distribution capacity between photovoltaic cell plate array and the earth
In the presence of so that common-mode voltage caused by photovoltaic combining inverter forms common mode current by distribution capacity, so as to cause power grid electricity
Stream distortion, electromagnetic interference, there are security risks.
Utility model content
Based on this, it is necessary to for there is common-mode voltage when in use in traditional photovoltaic combining inverter, so as to cause
, there is security risk, a kind of photovoltaic combining inverter be provided in power network current distortion, electromagnetic interference.
The photovoltaic combining inverter of the application, comprising:
First capacitor circuit, the input terminal of the first capacitor circuit and the anode of photovoltaic array connect；
First filter circuit, the input terminal of first filter circuit are electrically connected with the anode of the photovoltaic array；
Second condenser network, the input terminal of second condenser network and the output end of first filter circuit are electrically connected
It connects；
First switch circuit, the input terminal of the first switch circuit and the output end of first filter circuit are electrically connected
It connects；
Second switch circuit, the input terminal of the second switch circuit and the output end of the first switch circuit are electrically connected
It connects；And
DC/AC circuit, the output end of the first input end of the DC/AC circuit and first filter circuit
Electrical connection, the second input terminal of the DC/AC circuit respectively with the output end of second condenser network and described second
The output end of switching circuit is electrically connected, the third input terminal of the DC/AC circuit respectively with the first capacitor circuit
The zero curve electrical connection of output end, the output end of the first switch circuit, the cathode of the photovoltaic array and power grid, it is described straight
Stream/alternating current circuit output end is electrically connected with the firewire of the power grid.
The first capacitor circuit includes: in one of the embodiments,
First capacitor, one end of the first capacitor respectively with positive and described first filtered electrical of the photovoltaic array
The input terminal on road is electrically connected, and the other end of the first capacitor is electrically connected with the third input terminal of the DC/AC circuit.
First filter circuit includes: in one of the embodiments,
First inductance, one end of first inductance respectively with the anode of the photovoltaic array and the first capacitor circuit
Input terminal electrical connection, the other end of first inductance opens with the input terminal of second condenser network, described first respectively
The electrical connection of the first input end of the input terminal on powered-down road and the DC/AC circuit.
Second condenser network includes: in one of the embodiments,
Second capacitor, one end of second capacitor are opened with the output end of first filter circuit, described first respectively
The electrical connection of the first input end of the input terminal on powered-down road and the DC/AC circuit, the other end difference of second capacitor
It is electrically connected with the second input terminal of the output end of the second switch circuit and the DC/AC circuit.
The photovoltaic combining inverter in one of the embodiments, further include:
First protection circuit, the first protection circuit is connect with the first switch circuit in parallel, for preventing electric current
Reflux damages the first switch circuit.
The first switch circuit includes: in one of the embodiments,
First metal-oxide-semiconductor, first metal-oxide-semiconductor drain electrode respectively with the output end of first filter circuit, the direct current/
The output end electrical connection of the first input end of alternating current circuit and the first protection circuit, the source electrode difference of first metal-oxide-semiconductor
With the input terminal of the second switch circuit, the third input terminal of the DC/AC circuit and the first protection circuit
Input terminal electrical connection.
The photovoltaic combining inverter in one of the embodiments, further include:
Second protection circuit, the second protection circuit is connect with the second switch circuit in parallel, for preventing electric current
Reflux damages the second switch circuit.
The second switch circuit includes: in one of the embodiments,
Second metal-oxide-semiconductor, second metal-oxide-semiconductor drain electrode respectively with the input terminal of the first switch circuit, the direct current/
The output end electrical connection of the third input terminal of alternating current circuit and the second protection circuit, the source electrode difference of second metal-oxide-semiconductor
With the output end of second condenser network, the third input terminal of the DC/AC circuit and the second protection circuit
Input terminal electrical connection.
The photovoltaic combining inverter in one of the embodiments, further include:
Anti- circnit NOT, the input terminal of the anti-circnit NOT respectively with the output end of second condenser network and described second
The output end of switching circuit is electrically connected, the output end of the anti-circnit NOT respectively with the output end of first filter circuit and institute
The input terminal electrical connection of the second condenser network is stated, the anti-circnit NOT burns the photovoltaic grid-connected inversion for preventing adverse current
Device.
The anti-circnit NOT includes: in one of the embodiments,
First counnter attack diode, the positive output end with first filter circuit respectively of the first counnter attack diode
It is electrically connected with the input terminal of second condenser network, the cathode of the first counnter attack diode is electric with second capacitor respectively
The electrical connection of the output end of the output end on road and the second switch circuit.
The photovoltaic combining inverter in one of the embodiments, further include:
Second filter circuit, second filter circuit be electrically connected to the output end of the DC/AC circuit with it is described
Between the firewire of power grid.
Second filter circuit includes: in one of the embodiments,
Second inductance, one end of second inductance are electrically connected with the output end of the DC/AC circuit, and described second
The other end of inductance is electrically connected with the firewire of the power grid.
The DC/AC circuit includes: in one of the embodiments,
Third capacitor, one end of the third capacitor are electrically connected with the output end of first filter circuit；
One end of 4th capacitor, the 4th capacitor is electrically connected with the other end of the third capacitor, the 4th capacitor
The other end be electrically connected respectively with the output end of the output end of second condenser network and the second switch circuit；
First switch tube, the input terminal of the first switch tube are electrically connected with the output end of first filter circuit；
Second switch, the input terminal of the second switch is electrically connected with the output end of the first switch tube, described
The output end of second switch is electrically connected with the firewire of the power grid；
Second counnter attack diode, the cathode of the second counnter attack diode respectively with the output end of the first switch tube and
The input terminal of the second switch is electrically connected, the anode of the second counnter attack diode respectively with the first capacitor circuit
The zero curve electrical connection of output end, the output end of the first switch circuit, the cathode of the photovoltaic array and power grid；
The output end of third switching tube, the third switching tube is electrically connected with the firewire of the power grid, the third switch
The input terminal of pipe is electrically connected with the anode of the second counnter attack diode；
4th switching tube, the output end of the 4th switching tube are positive and described with the second counnter attack diode respectively
The input terminal of third switching tube is electrically connected, the other end of the input terminal of the 4th switching tube and the 4th capacitor, described the
The electrical connection of the output end of the output end of two condenser networks and the second switch circuit.
Compared with prior art, above-mentioned photovoltaic combining inverter, including first capacitor circuit, the first filter circuit, second
Condenser network, first switch circuit, second switch circuit and DC/AC circuit.The input terminal electricity of the first capacitor circuit
It is connected with the anode of photovoltaic array.The input terminal of first filter circuit is electrically connected with the anode of the photovoltaic array.It is described
The input terminal of second condenser network is electrically connected with the output end of first filter circuit.The input terminal of the first switch circuit
It is electrically connected with the output end of first filter circuit.The input terminal of the second switch circuit and the first switch circuit
Output end electrical connection.The first input end of the DC/AC circuit is electrically connected with the output end of first filter circuit.Institute
State the second input terminal of DC/AC circuit respectively with the output end of second condenser network and the second switch circuit
Output end electrical connection.The third input terminal of the DC/AC circuit respectively with the output end of the first capacitor circuit, described
The zero curve of the output end of first switch circuit, the cathode of the photovoltaic array and power grid is electrically connected.The DC/AC circuit
Output end is electrically connected with the firewire of the power grid.
The application passes through the first capacitor circuit, first filter circuit, second condenser network, described first
The cooperation of switching circuit, the second switch circuit and the DC/AC circuit, eliminates the photovoltaic array and the electricity
Common-mode voltage between net to avoid generating common mode current, and then substantially increases security performance.
Detailed description of the invention
Fig. 1 is the circuit block diagram for the photovoltaic combining inverter that one embodiment of the application provides；
Fig. 2 is the circuit diagram for the photovoltaic combining inverter that one embodiment of the application provides.
10 photovoltaic combining inverters
100 first capacitor circuits
110 photovoltaic arrays
120 first capacitors
200 first filter circuits
210 first inductance
220 anti-circnit NOTs
221 first counnter attack diodes
300 second condenser networks
310 second capacitors
400 first switch circuits
410 first protection circuits
411 first diodes
420 first metal-oxide-semiconductors
500 second switch circuits
510 second protection circuits
511 second diodes
520 second metal-oxide-semiconductors
600 DC/AC circuits
610 power grids
611 third capacitors
612 the 4th capacitors
613 first switch tubes
614 second switches
615 second counnter attack diodes
616 third switching tubes
617 the 4th switching tubes
618 third diodes
700 second filter circuits
710 second inductance
Specific embodiment
In order to make the above objects, features, and advantages of the present application more apparent, with reference to the accompanying drawing to the application
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this Shen
Please.But the application can be implemented with being much different from other way described herein, those skilled in the art can be not
Similar improvement is done in the case where violating the application intension, therefore the application is not limited by following public specific implementation.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.Term " and or " used herein includes one or more phases
Any and all combinations of the listed item of pass.
Referring to Figure 1, one embodiment of the application provides a kind of photovoltaic combining inverter 10, including first capacitor circuit 100,
First filter circuit 200, the second condenser network 300, first switch circuit 400, second switch circuit 500 and DC/AC
Circuit 600.The input terminal of first capacitor circuit 100 is connect with the anode of photovoltaic array 110.The input of first filter circuit 200
It holds and is electrically connected with the anode of photovoltaic array 110.The output end of the input terminal of second condenser network 300 and the first filter circuit 200
Electrical connection.The input terminal of first switch circuit 400 is electrically connected with the output end of the first filter circuit 200.Second switch circuit 500
Input terminal be electrically connected with the output end of first switch circuit 400.
The first input end of DC/AC circuit 600 is electrically connected with the output end of the first filter circuit 200.DC/AC
Output end of second input terminal of circuit 600 respectively with the output end of the second condenser network 300 and second switch circuit 500 is electrically connected
It connects.The third input terminal of DC/AC circuit 600 respectively with the output end of first capacitor circuit 100, first switch circuit 400
Output end, photovoltaic array 110 cathode and power grid 610 zero curve electrical connection.The output end and electricity of DC/AC circuit 600
The firewire of net 610 is electrically connected.
It is appreciated that the particular circuit configurations of first capacitor circuit 100 do not do specific restriction, as long as it can ensure that realizing
Charging/discharging function.In one embodiment, first capacitor circuit 100 can be made of a capacitor.In one embodiment,
First capacitor circuit 100 can be in series by multiple capacitors.The particular circuit configurations of first capacitor circuit 100, can be according to reality
Demand is selected.
It is appreciated that the specific structure of photovoltaic array 110 does not do specific restriction, as long as it can ensure that having generating function
(converting solar energy into electrical energy).In one embodiment, photovoltaic array 110 can be made of a solar panel.
In one embodiment, photovoltaic array 110 can also be made of multiple solar panels.
It is appreciated that the particular circuit configurations of the first filter circuit 200 do not do specific restriction, as long as it can ensure that realizing
Filter function.In one embodiment, the first filter circuit 200 can be made of inductance.In one embodiment, the first filter
Traditional filter circuit can also be used in wave circuit 200, as long as being able to achieve filter function.The specific electricity of first filter circuit 200
Line structure can be selected according to actual needs.
The particular circuit configurations of second condenser network 300 do not do specific restriction, as long as it can ensure that realizing charge and discharge electric work
Energy.In one embodiment, the second condenser network 300 can be made of a capacitor.In one embodiment, the second capacitor
Circuit 300 can be in series by multiple capacitors.The particular circuit configurations of second condenser network 300 can carry out according to actual needs
Selection.
It is appreciated that the particular circuit configurations of first switch circuit 400 do not do specific restriction, as long as it can ensure that cutting
Circuit.In one embodiment, first switch circuit 400 can be made of metal-oxide-semiconductor (field effect transistor).Implement at one
In example, first switch circuit 400 can be made of relay switch.The particular circuit configurations of first switch circuit 400, can be according to reality
Border demand is selected.
It is appreciated that the particular circuit configurations of second switch circuit 500 do not do specific restriction, as long as it can ensure that cutting
Circuit.In one embodiment, second switch circuit 500 can be made of metal-oxide-semiconductor (field effect transistor).Implement at one
In example, second switch circuit 500 can be made of relay switch.The particular circuit configurations of second switch circuit 500, can be according to reality
Border demand is selected.
It is appreciated that the particular circuit configurations of DC/AC circuit 600 do not do specific restriction, as long as it can ensure that will
Direct current is converted to exchange.The particular circuit configurations of DC/AC circuit 600 can be selected according to actual needs.One
In a embodiment, DC/AC circuit 600 can be made of multiple switch pipe.In one embodiment, DC/AC circuit 600
Traditional AC/DC conversion circuit can also be used, be also able to achieve the function that direct current is converted to exchange.
In the present embodiment, opened by first capacitor circuit 100, the first filter circuit 200, the second condenser network 300, first
The cooperation on powered-down road 400, second switch circuit 500 and DC/AC circuit 600, eliminates photovoltaic array 110 and power grid 610
Between common-mode voltage and then substantially increase security performance to avoid generating common mode current.
Fig. 2 is referred to, in one embodiment, first capacitor circuit 100 includes first capacitor 120.First capacitor 120
One end is electrically connected with the input terminal of the anode of photovoltaic array 110 and the first filter circuit 200 respectively.First capacitor 120 it is another
One end is electrically connected with the third input terminal of DC/AC circuit 600.
It is appreciated that the particular capacity of first capacitor 120 is unlimited, as long as it can ensure that charge and discharge.Implement at one
In example, the capacity of first capacitor 120 can be 50 microfarads (μ F).In one embodiment, the capacity of first capacitor 120 can be 200
Microfarad (μ F).In one embodiment, first capacitor 120 is Support Capacitor, is charged by photovoltaic array 110 to it.
In one embodiment, the first filter circuit 200 includes the first inductance 210.One end of first inductance 210 respectively with
The anode of photovoltaic array 110 and the input terminal of first capacitor circuit 100 are electrically connected.The other end of first inductance 210 is respectively with
The first input end electricity of the input terminal of two condenser networks 300, the input terminal of first switch circuit 400 and DC/AC circuit 600
Connection.It is filtered by the electric current that the first inductance 210 exports the photovoltaic array 110, interference is reduced, so that electric current is more
Stablize.
In one embodiment, the second condenser network 300 includes the second capacitor 310.One end of second capacitor 310 respectively with
The first input end of the output end of first filter circuit 200, the input terminal of first switch circuit 400 and DC/AC circuit 600
Electrical connection.The other end of second capacitor 310 respectively with the output end of second switch circuit 500 and DC/AC circuit 600
The electrical connection of two input terminals.The energy that high frequency switching needs is exported by the second capacitor 310, DC/AC circuit can be substantially reduced
The capacitance of 600 sides.
In one embodiment, the photovoltaic combining inverter of the application further includes the first protection circuit 410, with first switch
Circuit 400 is connected in parallel, for preventing current reflux from damaging first switch circuit 400.It is appreciated that the first protection circuit 410
Particular circuit configurations do not do specific restriction, as long as guarantee have the function of preventing current reflux.In one embodiment
In, the first protection circuit 410 can be made of first diode 411.In one embodiment, the first protection circuit 410 can also be by
Unidirectional conducting switch pipe is constituted.
In one embodiment, first switch circuit 400 includes the first metal-oxide-semiconductor 420.The drain electrode of first metal-oxide-semiconductor 420 is distinguished
With the output of the output end of the first filter circuit 200, the first input end of DC/AC circuit 600 and the first protection circuit 410
End electrical connection.The source electrode of first metal-oxide-semiconductor 420 respectively with the input terminal of second switch circuit 500, DC/AC circuit 600
The input terminal electrical connection of three input terminals and the first protection circuit 410.
In one embodiment, the first metal-oxide-semiconductor 420 can be the road N ditch metal-oxide-semiconductor.In one embodiment, the first metal-oxide-semiconductor 420
It can be the road P ditch metal-oxide-semiconductor.In one embodiment, the first metal-oxide-semiconductor 420 can be replaced relay switch.
In one embodiment, the photovoltaic combining inverter of the application further includes the second protection circuit 510.Second protection electricity
Road 510 is connected in parallel with second switch circuit 500.Second protection circuit 510 is for preventing current reflux damage second switch electricity
Road 500.It is appreciated that second protects the particular circuit configurations of circuit 510 not do specific restriction, as long as guaranteeing to have prevents electricity
Flow back to the function of stream.In one embodiment, the second protection circuit 510 can be made of the second diode 511.In a reality
It applies in example, the second protection circuit 510 can also be made of unidirectional conducting switch pipe.
In one embodiment, second switch circuit 500 includes the second metal-oxide-semiconductor 520.The drain electrode of second metal-oxide-semiconductor 520 is distinguished
With the output of the input terminal of first switch circuit 400, the third input terminal of DC/AC circuit 600 and the second protection circuit 510
End electrical connection.The source electrode of second metal-oxide-semiconductor 520 respectively with the output end of the second condenser network 300, DC/AC circuit 600
The input terminal electrical connection of three input terminals and the second protection circuit 510.
In one embodiment, the second metal-oxide-semiconductor 520 can be the road N ditch metal-oxide-semiconductor.In one embodiment, the second metal-oxide-semiconductor 520
It can be the road P ditch metal-oxide-semiconductor.In one embodiment, the second metal-oxide-semiconductor 520 can be replaced relay switch.
In one embodiment, the photovoltaic combining inverter of the application further includes anti-circnit NOT 220.Anti- circnit NOT 220
Input terminal is electrically connected with the output end of the output end of the second condenser network 300 and second switch circuit 500 respectively.Anti- circnit NOT
220 output end is electrically connected with the input terminal of the output end of the first filter circuit 200 and the second condenser network 300 respectively.Counnter attack
Circuit 220 burns the photovoltaic combining inverter 10 for preventing adverse current.
It is appreciated that the particular circuit configurations of anti-circnit NOT 220 do not do specific restriction, as long as guaranteeing to have prevents electric current
The function of reflux.In one embodiment, anti-circnit NOT 220 can be made of diode.In one embodiment, counnter attack electricity
Road 220 can also be made of the switching tube with one-way conduction.The particular circuit configurations of anti-circnit NOT 220, can be according to actual needs
It is selected.
In one embodiment, anti-circnit NOT 220 includes the first counnter attack diode 221.First counnter attack diode 221 is just
Pole is electrically connected with the input terminal of the output end of the first filter circuit 200 and the second condenser network 300 respectively.First counnter attack diode
221 cathode is electrically connected with the output end of the output end of the second condenser network 300 and second switch circuit 500 respectively.At one
In embodiment, the first counnter attack diode 221 can be replaced the switching tube with one-way conduction, such as the road N ditch metal-oxide-semiconductor.
In one embodiment, the photovoltaic combining inverter of the application further includes the second filter circuit 700.Second filtered electrical
Road 700 is electrically connected between the output end of DC/AC circuit 600 and the firewire of power grid 610.It is appreciated that the second filtered electrical
The particular circuit configurations on road 700 do not do specific restriction, as long as it can ensure that realizing filter function.In one embodiment
In, the second filter circuit 700 can be made of inductance.In one embodiment, traditional filtering can also be used in the second filter circuit 700
Circuit, as long as being able to achieve filter function.The particular circuit configurations of second filter circuit 700 can carry out according to actual needs
Selection.
In one embodiment, the second filter circuit 700 includes the second inductance 710.One end of second inductance 710 and straight
The output end of stream/alternating current circuit 600 is electrically connected, and the other end of the second inductance 710 is electrically connected with the firewire of power grid 610.Pass through
The grid-connected current that two inductance 710 export the DC/AC circuit 600 is filtered, and interference is reduced, so that grid-connected current is more
Add stabilization.
In one embodiment, DC/AC circuit 600 includes third capacitor 611, the 4th capacitor 612, first switch tube
613, second switch 614, the second counnter attack diode 615, third switching tube 616 and the 4th switching tube 617.Third capacitor 611
One end be electrically connected with the output end of the first filter circuit 200.One end of 4th capacitor 612 and the other end of third capacitor 611
Electrical connection.The other end of 4th capacitor 612 is defeated with the output end of the second condenser network 300 and second switch circuit 500 respectively
Outlet electrical connection.The input terminal of first switch tube 613 is electrically connected with the output end of the first filter circuit 200.Second switch 614
Input terminal be electrically connected with the output end of first switch tube 613, the firewire electricity of the output end of second switch 614 and power grid 610
Connection.
The cathode of second counnter attack diode 615 is defeated with the output end of first switch tube 613 and second switch 614 respectively
Enter end electrical connection.Second counnter attack diode 615 anode respectively with the output end of first capacitor circuit 100, first switch circuit
The zero curve of 400 output end, the cathode of photovoltaic array 110 and power grid 610 is electrically connected.The output end and electricity of third switching tube 616
The firewire of net 610 is electrically connected.The input terminal of third switching tube 616 is electrically connected with the anode of the second counnter attack diode 615.4th opens
The output end for closing pipe 617 is electrically connected with the input terminal of the anode of the second counnter attack diode 615 and third switching tube 616 respectively.The
The other end of the input terminals of four switching tubes 617 and the 4th capacitor 612, the output end of the second condenser network 300 and second switch electricity
The output end on road 500 is electrically connected.
In one embodiment, first switch tube 613 or/and second switch 614 or/and third switching tube 616 or/
It can be constituted with the 4th switching tube 617 for metal-oxide-semiconductor.The both ends of first switch tube 613, second switch 614 in one embodiment
Both ends, the both ends of third switching tube 616 and the both ends of the 4th switching tube 617 be parallel with third diode 618.By each
Third diode 618 protects first switch tube 613, second switch 614, third switching tube 616 and the 4th switching tube respectively
617, prevent current reflux, damage first switch tube 613, second switch 614, third switching tube 616 and the 4th switch
Pipe 617.
The zero curve of the cathode of photovoltaic array 110 and power grid 610 is connected to DC/AC circuit 600 by the application simultaneously
Third input terminal (i.e. DC side midpoint), can eliminate the common-mode voltage generated inside photovoltaic combining inverter 10, to ensure that
Common mode leakage current is zero, substantially increases security performance.Third capacitor 611 and the 4th capacitor in DC/AC circuit 600
612 are clamped by 310 high frequency of the second capacitor, avoid midpoint potential (the third input terminal of the i.e. described DC/AC circuit 600)
Existing secondary pulsation, reduces the capacitance demand of third capacitor 611 and the 4th capacitor 612.
The application can be realized photovoltaic battery panel (the i.e. described photovoltaic array 110) with wider generation range and maximum work
Rate point tracks (maximum power point tracking, MPPT) function.MPPT is a kind of by adjusting electrical module
Working condition, enable photovoltaic panel export more electric energy electrical system can by solar panel issue direct current it is effective
Ground is stored in battery, can efficiently solve the life and industry of the not covered remote districts of normal grid and tourist area
Electricity consumption, generation environment does not pollute.In some embodiments, MPPT control can mutually be tied using stagnant ring comparison method with optimum gradient method
The given value of inductive current is calculated in the algorithm of conjunction, realizes photovoltaic pond plate by controlling inductive current trace command electric current
MPPT.
In conclusion the application passes through first capacitor circuit 100, the first filter circuit 200, the second condenser network 300, the
The cooperation of one switching circuit 400, second switch circuit 500 and DC/AC circuit 600, eliminates photovoltaic array 110 and power grid
Common-mode voltage between 610 to avoid generating common mode current, and then substantially increases security performance.The application can also simultaneously
Enough realize that photovoltaic array 110 has the function of wider generation range and MPPT maximum power point tracking.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
The limitation to utility model patent range therefore cannot be interpreted as.It should be pointed out that for the ordinary skill people of this field
For member, without departing from the concept of this application, various modifications and improvements can be made, these belong to the application's
Protection scope.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. a kind of photovoltaic combining inverter characterized by comprising
First capacitor circuit, the input terminal of the first capacitor circuit and the anode of photovoltaic array connect；
First filter circuit, the input terminal of first filter circuit are electrically connected with the anode of the photovoltaic array；
Second condenser network, the input terminal of second condenser network are electrically connected with the output end of first filter circuit；
First switch circuit, the input terminal of the first switch circuit are electrically connected with the output end of first filter circuit；
Second switch circuit, the input terminal of the second switch circuit are electrically connected with the output end of the first switch circuit；With
And
DC/AC circuit, the first input end of the DC/AC circuit and the output end of first filter circuit are electrically connected
Connect, the second input terminal of the DC/AC circuit respectively with the output end and the second switch of second condenser network
The output end of circuit is electrically connected, the output with the first capacitor circuit respectively of the third input terminal of the DC/AC circuit
The zero curve at end, the output end of the first switch circuit, the cathode of the photovoltaic array and power grid is electrically connected, the direct current/friendship
The output end of current circuit is electrically connected with the firewire of the power grid.
2. photovoltaic combining inverter according to claim 1, which is characterized in that the first capacitor circuit includes:
First capacitor, one end of the first capacitor respectively with positive and described first filter circuit of the photovoltaic array
Input terminal electrical connection, the other end of the first capacitor are electrically connected with the third input terminal of the DC/AC circuit.
3. photovoltaic combining inverter according to claim 1, which is characterized in that first filter circuit includes:
First inductance, one end of first inductance are defeated with the positive and described first capacitor circuit of the photovoltaic array respectively
Enter end electrical connection, the other end of first inductance is electric with the input terminal of second condenser network, the first switch respectively
The electrical connection of the first input end of the input terminal on road and the DC/AC circuit.
4. photovoltaic combining inverter according to claim 1, which is characterized in that second condenser network includes:
Second capacitor, one end of second capacitor are electric with the output end of first filter circuit, the first switch respectively
The first input end of the input terminal on road and the DC/AC circuit electrical connection, the other end of second capacitor respectively with institute
State the second input terminal electrical connection of the output end and the DC/AC circuit of second switch circuit.
5. photovoltaic combining inverter according to claim 1, which is characterized in that
The photovoltaic combining inverter further includes the first protection circuit, and the first protection circuit and the first switch circuit are simultaneously
Connection connection, for preventing current reflux from damaging the first switch circuit；
The first switch circuit include the first metal-oxide-semiconductor, first metal-oxide-semiconductor drain electrode respectively with first filter circuit
The output end electrical connection of output end, the first input end of the DC/AC circuit and the first protection circuit, described first
The source electrode of metal-oxide-semiconductor respectively with the input terminal of the second switch circuit, the third input terminal of the DC/AC circuit and described
The input terminal electrical connection of first protection circuit.
6. photovoltaic combining inverter according to claim 1, which is characterized in that
The photovoltaic combining inverter further includes the second protection circuit, and the second protection circuit and the second switch circuit are simultaneously
Connection connection, for preventing current reflux from damaging the second switch circuit；
The second switch circuit include the second metal-oxide-semiconductor, second metal-oxide-semiconductor drain electrode respectively with the first switch circuit
The output end electrical connection of input terminal, the third input terminal of the DC/AC circuit and the second protection circuit, described second
The source electrode of metal-oxide-semiconductor respectively with the output end of second condenser network, the third input terminal of the DC/AC circuit and described
The input terminal electrical connection of second protection circuit.
7. photovoltaic combining inverter according to claim 1, which is characterized in that
The photovoltaic combining inverter further includes anti-circnit NOT, and the input terminal of the anti-circnit NOT is electric with second capacitor respectively
The electrical connection of the output end of the output end on road and the second switch circuit, the output end of the anti-circnit NOT is respectively with described first
The electrical connection of the input terminal of the output end of filter circuit and second condenser network, the anti-circnit NOT is for preventing adverse current
Burn the photovoltaic combining inverter；
The anti-circnit NOT includes the first counnter attack diode, and the anode of the first counnter attack diode is filtered with described first respectively
The input terminal of the output end of circuit and second condenser network electrical connection, the cathode of the first counnter attack diode respectively with institute
State the output end electrical connection of the output end and the second switch circuit of the second condenser network.
8. photovoltaic combining inverter according to claim 1, which is characterized in that
The photovoltaic combining inverter further includes the second filter circuit, and second filter circuit is electrically connected to the direct current/friendship
Between the output end of current circuit and the firewire of the power grid.
9. photovoltaic combining inverter according to claim 8, which is characterized in that second filter circuit includes:
Second inductance, one end of second inductance are electrically connected with the output end of the DC/AC circuit, second inductance
The other end be electrically connected with the firewire of the power grid.
10. photovoltaic combining inverter according to claim 1, which is characterized in that the DC/AC circuit includes:
Third capacitor, one end of the third capacitor are electrically connected with the output end of first filter circuit；
One end of 4th capacitor, the 4th capacitor is electrically connected with the other end of the third capacitor, the 4th capacitor it is another
One end is electrically connected with the output end of the output end of second condenser network and the second switch circuit respectively；
First switch tube, the input terminal of the first switch tube are electrically connected with the output end of first filter circuit；
Second switch, the input terminal of the second switch are electrically connected with the output end of the first switch tube, and described second
The output end of switching tube is electrically connected with the firewire of the power grid；
Second counnter attack diode, the cathode of the second counnter attack diode respectively with the output end of the first switch tube and described
The input terminal of second switch is electrically connected, the positive output with the first capacitor circuit respectively of the second counnter attack diode
The zero curve at end, the output end of the first switch circuit, the cathode of the photovoltaic array and power grid is electrically connected；
The output end of third switching tube, the third switching tube is electrically connected with the firewire of the power grid, the third switching tube
Input terminal is electrically connected with the anode of the second counnter attack diode；
4th switching tube, the output end of the 4th switching tube respectively with the anode of the second counnter attack diode and the third
The input terminal of switching tube is electrically connected, the input terminal of the 4th switching tube and the other end, second electricity of the 4th capacitor
The electrical connection of the output end of the output end of capacitive circuit and the second switch circuit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111969704A (en) * | 2020-08-10 | 2020-11-20 | 中山大学 | Photovoltaic cell control circuit and control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111969704A (en) * | 2020-08-10 | 2020-11-20 | 中山大学 | Photovoltaic cell control circuit and control method |
| CN111969704B (en) * | 2020-08-10 | 2021-07-20 | 中山大学 | Photovoltaic cell control circuit and control method |
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