CN107230997A - A kind of photovoltaic generating system - Google Patents

A kind of photovoltaic generating system Download PDF

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Publication number
CN107230997A
CN107230997A CN201710330741.XA CN201710330741A CN107230997A CN 107230997 A CN107230997 A CN 107230997A CN 201710330741 A CN201710330741 A CN 201710330741A CN 107230997 A CN107230997 A CN 107230997A
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CN
China
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module
photovoltaic array
end
voltage signal
voltage
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CN201710330741.XA
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Chinese (zh)
Inventor
许飞
石磊
高拥兵
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华为技术有限公司
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Priority to CN201710330741.XA priority Critical patent/CN107230997A/en
Publication of CN107230997A publication Critical patent/CN107230997A/en

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • H02J3/382Dispersed generators the generators exploiting renewable energy
    • H02J3/383Solar energy, e.g. photovoltaic energy
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02SGENERATION OF ELECTRIC POWER BY CONVERSION OF INFRA-RED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30Electrical components
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion electric or electronic aspects
    • Y02E10/563Power conversion electric or electronic aspects for grid-connected applications

Abstract

This application discloses a kind of photovoltaic generating system, belong to photoelectric field.The system includes:Photovoltaic array, voltage changing module, bus isolation module and inversion module;The photovoltaic array is connected with the voltage changing module, and the voltage changing module is also connected with the bus isolation module, and the bus isolation module is also connected with the inversion module;The bus isolation module turns on the voltage changing module and the inversion module when the photovoltaic array inputs the first d. c. voltage signal of its generation to the voltage changing module, first d. c. voltage signal is converted to the second d. c. voltage signal by the voltage changing module, second d. c. voltage signal is inputted to the inversion module, second d. c. voltage signal is converted to ac voltage signal by the inversion module;The bus isolation module isolates the voltage changing module and the inversion module when the photovoltaic array stops and inputs first d. c. voltage signal to the voltage changing module.The application can avoid the occurrence of PID effects.

Description

A kind of photovoltaic generating system

Technical field

The application is related to photoelectric field, more particularly to a kind of photovoltaic generating system.

Background technology

Current tellurian fossil energy reserves are fewer and fewer, therefore the mankind begin to use other regenerative resources, example Such as use wind energy or solar energy.For solar energy, the mankind can use photovoltaic devices to convert the solar into electric energy, then will The electrical energy transportation is used into power network for the mankind.

Photovoltaic devices include the parts such as photovoltaic battery panel and inverter, and sunshine is radiated on photovoltaic battery panel, photovoltaic electric The sunshine is converted into d. c. voltage signal by pond plate;The d. c. voltage signal is converted to ac voltage signal by inverter again, The ac voltage signal is transported in the power network of exchange again.

During the application is realized, inventor has found that prior art at least has problems with:

Photovoltaic battery panel two ends in the case where night is grid-connected, relative to there may be negative voltage between the earth, can so be led Photovoltaic battery panel is caused potential induction attenuation (Potential Induced Degradation, PID) effect occur so that photovoltaic There is power output decay in cell panel.

The content of the invention

In order to avoid PID effects and power output decay occurs in photovoltaic array, this application provides a kind of photovoltaic generation System.The technical scheme is as follows:

In a first aspect, the example of the application provides a kind of photovoltaic generating system, including:Photovoltaic array, voltage changing module, mother Line isolation module and inversion module;The photovoltaic array is connected with the voltage changing module, the voltage changing module also with the bus Isolation module is connected, and the bus isolation module is also connected with the inversion module;The bus isolation module is in the photovoltaic Array turns on the voltage changing module and the inversion mould when the first d. c. voltage signal of its generation is inputted to the voltage changing module First d. c. voltage signal is converted to the second d. c. voltage signal by block, the voltage changing module, defeated to the inversion module Enter second d. c. voltage signal, second d. c. voltage signal is converted to ac voltage signal by the inversion module; The bus isolation module the photovoltaic array stop to the voltage changing module input first d. c. voltage signal after From the voltage changing module and the inversion module.Because the bus isolation module stops to the transformation in the photovoltaic array Module is isolated on the voltage changing module and the inversion module, such inversion module when inputting first d. c. voltage signal Negative current signal can not be flowed into photovoltaic array, it is to avoid by voltage and negative pole between the positive terminal and earth terminal of photovoltaic array Voltage between end and earth terminal is down for negative voltage, so as to avoid photovoltaic array from PID effects and power output decay occur.

In a kind of possible implementation, the voltage changing module includes:Inductance, the first diode and first switch pipe; One end of the inductance is electrically connected with the positive terminal of the photovoltaic array, the anode of the other end and first diode and described One end electrical connection of first switch pipe, the negative electrode of first diode is electrically connected with the bus capacitor positive terminal of the inversion module Connect;One end of the other end of the first switch pipe and the negative pole end of the photovoltaic array and the bus isolation module is electrically connected Connect, the other end of the bus isolation module is electrically connected with the bus capacitor negative pole end of the inversion module;The bus isolation Module turns on the negative pole of the photovoltaic array when the photovoltaic array inputs the first d. c. voltage signal to the voltage changing module End and the bus capacitor negative pole end of the inversion module, and stop in the photovoltaic array to voltage changing module input first Isolate the negative pole end of the photovoltaic array and the bus capacitor negative pole end of the inversion module during d. c. voltage signal.Due to described One end of bus isolation module is electrically connected with the negative pole end of the photovoltaic array, the bus capacitor of the other end and the inversion module Negative pole end electrically connect, the photovoltaic array stop to the voltage changing module input the first d. c. voltage signal when the bus every From the bus capacitor negative pole end for the negative pole end and the inversion module that module isolates the photovoltaic array, the inversion module is prevented Bus capacitor negative pole end on negative current signal be flowed into the photovoltaic array, it is to avoid by the positive terminal of photovoltaic array with connecing The voltage between voltage and negative pole end and earth terminal between ground terminal is down for negative voltage, so as to avoid photovoltaic array from occurring PID effects and power output decay.

In a kind of possible implementation, the bus isolation module includes the second diode, second diode Negative electrode electrically connected with the negative pole end of the photovoltaic array, anode is electrically connected with the bus capacitor negative pole end of the inversion module; So when photovoltaic array stops inputting the first d. c. voltage signal to voltage changing module, second diode-isolated can be passed through The negative pole end electrical connection of the photovoltaic array and the bus capacitor negative pole end of the inversion module.

In a kind of possible implementation, the bus isolation module includes second switch pipe, the second switch pipe One end electrically connected with the negative pole end of the photovoltaic array, the bus capacitor negative pole end of the other end and the inversion module is electrically connected Connect;The second switch pipe is closed when the photovoltaic array inputs the first d. c. voltage signal to the voltage changing module, and Disconnected when the photovoltaic array stops and inputs the first d. c. voltage signal to the voltage changing module;So stop in photovoltaic array When inputting the first d. c. voltage signal to voltage changing module, the negative pole of the photovoltaic array can be isolated by the second switch pipe End electrical connection and the bus capacitor negative pole end of the inversion module.

In a kind of possible implementation, the bus isolation module includes the second diode and second switch pipe, institute One end of the negative electrode and the second switch pipe of stating the second diode is electrically connected with the negative pole end of the photovoltaic array, and described second The other end of the anode of diode and the second switch pipe is electrically connected with the bus capacitor negative pole end of the inversion module;It is described Second switch pipe is closed when the photovoltaic array inputs the first d. c. voltage signal to the voltage changing module, and in the light Photovoltaic array stops disconnecting when inputting the first d. c. voltage signal to the voltage changing module.Due to the second diode and second switch pipe Parallel connection, can be electric by the negative pole end of photovoltaic array described in second diode-isolated so in second switch pipe failure Connection and the bus capacitor negative pole end of the inversion module, ensure that photovoltaic generating system is normally run.

In a kind of possible implementation, the voltage changing module includes:Inductance, the first diode and first switch pipe; One end of the inductance is electrically connected with the negative pole end of the photovoltaic array, the negative electrode of the other end and first diode and described One end electrical connection of first switch pipe, the anode of first diode is electrically connected with the bus capacitor negative pole end of the inversion module Connect;One end of the other end of the first switch pipe and the positive terminal of the photovoltaic array and the bus isolation module is electrically connected Connect, the other end of the bus isolation module is electrically connected with the bus capacitor positive terminal of the inversion module;The bus isolation Module turns on the positive pole of the photovoltaic array when the photovoltaic array inputs the first d. c. voltage signal to the voltage changing module End and the bus capacitor positive terminal of the inversion module, and stop in the photovoltaic array to voltage changing module input first Isolate the positive terminal of the photovoltaic array and the bus capacitor positive terminal of the inversion module during d. c. voltage signal.

In a kind of possible implementation, the bus isolation module includes the second diode, second diode Anode electrically connected with the positive terminal of the photovoltaic array, negative electrode is electrically connected with the bus capacitor positive terminal of the inversion module.

In a kind of possible implementation, the bus isolation module includes second switch pipe, the second switch pipe One end electrically connected with the positive terminal of the photovoltaic array, the bus capacitor positive terminal of the other end and the inversion module is electrically connected Connect;The second switch pipe is closed when the photovoltaic array inputs the first d. c. voltage signal to the voltage changing module, and Disconnected when the photovoltaic array stops and inputs the first d. c. voltage signal to the voltage changing module.

In a kind of possible implementation, the bus isolation module includes the second diode and second switch pipe, institute One end of the anode and the second switch pipe of stating the second diode is electrically connected with the positive terminal of the photovoltaic array, and described second The other end of the negative electrode of diode and the second switch pipe is electrically connected with the bus capacitor positive terminal of the inversion module;It is described Second switch pipe is closed when the photovoltaic array inputs the first d. c. voltage signal to the voltage changing module, and in the light Photovoltaic array stops disconnecting when inputting the first d. c. voltage signal to the voltage changing module.

In a kind of possible implementation, the photovoltaic generating system also includes:Compensate power module, the compensation electricity One end of source module is electrically connected with the negative pole end of the photovoltaic array, and the other end of the compensation power module is electrically connected with earth terminal Connect;The compensation power module is used to input positive voltage signal to the photovoltaic array.By being inputted just to the photovoltaic array Voltage signal, can so be repaired by the positive voltage signal to photovoltaic array, to recover photovoltaic array power output.

In a kind of possible implementation, the compensation power module is dc source.

In a kind of possible implementation, the photovoltaic generating system also includes:Compensate power module, the compensation electricity One end of source module is electrically connected with the negative pole end of the photovoltaic array, and the other end of the compensation power module is connected with power network; The ac voltage signal that the compensation power module is used to convey in the power network is converted to positive direct-current voltages signal, to the light Photovoltaic array inputs the positive direct-current voltages signal.By the way that the ac voltage signal of power network is converted into positive voltage signal, to described Photovoltaic array inputs positive voltage signal, photovoltaic array can so be repaired by the positive voltage signal, to recover photovoltaic Array output power.

In a kind of possible implementation, the compensation power module is rectification circuit.

Brief description of the drawings

Fig. 1 is a kind of structural representation of photovoltaic generating system of the embodiment offer of the application;

Fig. 2 is the structural representation of another photovoltaic generating system of the embodiment offer of the application;

Fig. 3 is the structural representation of another photovoltaic generating system of the embodiment offer of the application;

Fig. 4 is the structural representation of another photovoltaic generating system of the embodiment offer of the application;

Fig. 5 is the structural representation of another photovoltaic generating system of the embodiment offer of the application;

Fig. 6 is the structural representation of another photovoltaic generating system of the embodiment offer of the application;

Fig. 7 is the structural representation of another photovoltaic generating system of the embodiment offer of the application;

Fig. 8 is the structural representation of another photovoltaic generating system of the embodiment offer of the application;

Fig. 9 is the structural representation of another photovoltaic generating system of the embodiment offer of the application;

Figure 10 is the structural representation of another photovoltaic generating system of the embodiment offer of the application.

Embodiment

Referring to Fig. 1, the embodiment of the application one provides a kind of photovoltaic generating system, including:

Photovoltaic array 1, voltage changing module 2, bus isolation module 3 and inversion module 4;

Photovoltaic array 1 is connected with voltage changing module 2, and voltage changing module 2 is also connected with bus isolation module 3, bus isolation module 3 Also it is connected with inversion module 4;

Bus isolation module 3 is turned on when photovoltaic array 1 inputs the first d. c. voltage signal of its generation to voltage changing module 2 Voltage changing module 2 and inversion module 4, the first d. c. voltage signal is converted to the second d. c. voltage signal by voltage changing module 2, to inversion Module 4 inputs the second d. c. voltage signal, and the second d. c. voltage signal is converted to ac voltage signal by inversion module 4;

Bus isolation module 3 isolates transformation when photovoltaic array 1 stops and inputs the first d. c. voltage signal to voltage changing module 2 Module 2 and inversion module 4.

Photovoltaic array 1 is p-type photovoltaic array, and the first d. c. voltage signal, i.e. light are converted light energy into when by illumination Photovoltaic array 1 is started working, now the conducting voltage changing module 2 of bus isolation module 3 and inversion module 4.Photovoltaic array 1 is to voltage changing module First d. c. voltage signal is converted into the second d. c. voltage signal, first by 2 the first d. c. voltage signals of conveying, voltage changing module 2 The magnitude of voltage of d. c. voltage signal is more than or less than the magnitude of voltage of the second d. c. voltage signal, straight to the conveying second of inversion module 4 Flow voltage signal.Inversion module 4 is connected with power network, for the second d. c. voltage signal to be converted into ac voltage signal, to electricity Net conveys the ac voltage signal.

Photovoltaic array 1 stops converting light energy into the first d. c. voltage signal when being not affected by illumination, for example, night without During illumination, photovoltaic battery module 1 stops converting light energy into the first d. c. voltage signal, i.e. photovoltaic when being not affected by sunshine irradiation Array 1 stops inputting the first d. c. voltage signal to voltage changing module 2, now the isolation voltage changing module 2 of bus isolation module 3 and inversion Module 4.When photovoltaic array 1 is stopped, inversion module 4 may also be connected with power network, and inversion module 4 can produce negative voltage letter Number, because voltage changing module 2 is isolated with inversion module 4, so preventing inversion module 4 from being negative by the voltage pull-down of photovoltaic array 1 Voltage, so that the voltage avoided between the two ends of photovoltaic array 1 and earth terminal is changed into negative voltage, it is to avoid photovoltaic array 1 occurs PID effects, and then avoid influenceing the power output of photovoltaic array 1.

Referring to Fig. 1, the output end of photovoltaic array 1 includes positive terminal PV+ and negative pole end PV-, the positive terminal PV of photovoltaic array 1 + and negative pole end PV- be connected with voltage changing module 2, the input of inversion module 4 includes bus capacitor positive terminal 4a and bus capacitor Negative pole end 4b.

Referring to Fig. 2 or Fig. 3, photovoltaic array 1 can include the photovoltaic battery panel of multiple series connection, the photovoltaic battery panel of series connection Two ends are respectively each photovoltaic battery panel in the positive terminal PV+ and negative pole end PV- of photovoltaic array 1, the plurality of photovoltaic battery panel It is p-type photovoltaic battery panel.For example, photovoltaic array 1 can include the photovoltaic battery panel of two series connection, include the light of four series connection Lie prostrate cell panel or include the photovoltaic battery panel of six series connection.

Referring to Fig. 2 to Fig. 7, voltage changing module 2 includes:Inductance L, the first diode D1 and first switch pipe S1;Optionally, should Voltage changing module 2 also includes the 3rd diode D3.Bus isolation module 3 includes:Second diode D2 and/or second switch pipe S2.

Wherein, the connection side of the device that voltage changing module 2 includes and photovoltaic array 1, bus isolation module 3 and inversion module 4 Formula includes common cathode connected mode and common-anode connected mode, two kind connected modes will be carried out in subsequent content detailed Explanation.

Referring to Fig. 2 or Fig. 5, inversion module 4 includes the first electric capacity C1, the second electric capacity C2 and inverter 41.

First electric capacity C1 one end is electrically connected with the first input end of inverter 41, and both tie points are inversion module 4 bus capacitor positive terminal 4a, the second electric capacity C2 one end is electrically connected with the second input of inverter 41, both tie points As the bus capacitor negative pole end 4b of inversion module 4, the first electric capacity C1 other end, the second electric capacity C2 other end and inverter 41 electrical connections.The common connecting point O of the first electric capacity C1 other end, the second electric capacity C2 other end and inverter 41 is inverter Bus midpoint.

Referring to Fig. 2 or Fig. 5, inverter 41 can also be connected with power network.When actually realizing, inverter 41 can have three Each output end in output end, three output ends and a live wire of outer end power network are corresponded, each output end and its A corresponding live wire is connected.The second d. c. voltage signal that inverter 41 is used to input voltage changing module 2 is converted to alternating current Signal is pressed, then ac voltage signal is transported in power network.

, wherein it is desired to which explanation is:When photovoltaic array 1 is stopped, when inverter 41 is connected with power network, inverter 41 can be converted to the ac voltage signal in power network d. c. voltage signal, and in bus capacitor positive terminal 4a and bus capacitor Busbar voltage V is formed between negative pole end 4b.Magnitude of voltage at inverter bus midpoint O is 0, at bus capacitor positive terminal 4a Magnitude of voltage be positive 1/2nd busbar voltage V, magnitude of voltage bus capacitor negative pole end 4b at for minus 1/2nd mother Line voltage V.

Next two kinds of device and photovoltaic array 1, bus isolation module 3 and the inversion module 4 included to voltage changing module 2 Connected mode is illustrated one by one respectively.

For common cathode connected mode, referring to Fig. 2, inductance L one end is electrically connected with the positive terminal PV+ of photovoltaic array 1, separately One end is electrically connected with the first diode D1 anode and first switch pipe S1 one end, the first diode D1 negative electrode and inversion mould The first input end 4a electrical connections of block 4;The first switch pipe S1 other end is isolated with the negative pole end PV- and bus of photovoltaic array 1 The input electrical connection of module 3, the output end of bus isolation module 3 is electrically connected with the bus capacitor negative pole end 4b of inversion module 4.

So-called common cathode connected mode refers to the negative pole end PV- of photovoltaic array 1 and the negative input of voltage changing module 2 and defeated Go out end to be joined directly together.

In common cathode connected mode, bus isolation module 3 inputs the first direct current in photovoltaic array 1 to voltage changing module 2 The negative pole end PV- and inversion module 4 of conducting photovoltaic array 1 bus capacitor negative pole end 4b when pressing signal.Now, photovoltaic array 1 Under the irradiation of light, the first d. c. voltage signal is converted light energy into, the first d. c. voltage signal is input to voltage changing module 2; First d. c. voltage signal is converted to the second d. c. voltage signal by voltage changing module 2, by bus isolation module 3 by the second direct current Voltage signal is delivered to inverter 41, and the second d. c. voltage signal is converted into ac voltage signal, this is exchanged by inverter 41 Voltage signal is transported in power network.

Bus isolation module 3 isolates photovoltaic when photovoltaic array 1 stops and inputs the first d. c. voltage signal to voltage changing module 2 The negative pole end PV- of the array 1 and bus capacitor negative pole end 4b of inversion module 4.Now, photovoltaic array 1 is stopped, due to inversion Device 41 is connected with power network, and the negative pole end PV- and inversion module 4 of photovoltaic array 1 bus capacitor are isolated due to bus isolation module 3 Negative pole end 4b, thus prevent the negative pole PV- and just that the negative current signal at bus capacitor negative pole end 4b is flowed into photovoltaic array 1 Extreme PV+, so that the voltage avoided between the two ends of photovoltaic array 1 and earth terminal is changed into negative voltage, it is to avoid photovoltaic array 1 goes out Existing PID effects, and then avoid influenceing the power output of photovoltaic array 1.

If voltage changing module 2 also includes the 3rd diode D3, the 3rd diode D3 anode can be with photovoltaic array 1 Positive terminal PV+ is electrically connected, and negative electrode can be electrically connected with the bus capacitor positive terminal 4a of inversion module 4.

Under common cathode connected mode, the annexation of the device that bus isolation module 3 includes and other devices is as follows:

Referring to Fig. 2, when bus isolation module 3 includes the second diode D2, the second diode D2 negative electrode and photovoltaic battle array The negative pole end PV- electrical connections of row 1, anode is electrically connected with the bus capacitor negative pole end 4b of inversion module 4.

Referring to Fig. 3, when bus isolation module 3 includes second switch pipe S2, second switch pipe S2 one end and photovoltaic array 1 Negative pole end PV- electrical connections, the other end electrically connects with the bus capacitor negative pole end 4b of inversion module 4;Second switch pipe S2 is in light Photovoltaic array 1 is closed when inputting the first d. c. voltage signal to voltage changing module 2, to turn on negative pole end PV- and the inversion of photovoltaic array 1 The bus capacitor negative pole end 4b of module 4, and when photovoltaic array 1 stops inputting the first d. c. voltage signal to voltage changing module 2 Disconnect, to isolate the negative pole end PV- of photovoltaic array 1 and the bus capacitor negative pole end 4b of inversion module 4.

Referring to Fig. 4, when bus isolation module 3 includes the second diode D2 and second switch pipe S2, the second diode D2's Negative electrode and second switch pipe S2 one end are electrically connected with the negative pole end PV- of photovoltaic array 1, the second diode D2 anode and second The switching tube S2 other end is electrically connected with the bus capacitor negative pole end 4b of inversion module 4;Second switch pipe S2 photovoltaic array 1 to Voltage changing module 2 is closed when inputting the first d. c. voltage signal, to turn on the negative pole end PV- of photovoltaic array 1 and the mother of inversion module 4 Line capacitance negative pole end 4b, and photovoltaic array 1 stop to voltage changing module 2 input the first d. c. voltage signal when disconnect, with every From the negative pole end PV- and the bus capacitor negative pole end 4b of inversion module 4 of photovoltaic array 1.

For the mode shown in Fig. 4, when second switch pipe S2 breaks down, the second diode D2 can be in photovoltaic array 1 stops isolating when inputting the first d. c. voltage signal to voltage changing module 2 the bus capacitor negative pole end 4b and photovoltaic battle array of inversion module 4 The negative pole end PV- of row 1.

For common-anode connected mode, referring to Fig. 5, inductance L one end is electrically connected with the negative pole end PV- of photovoltaic array 1, separately One end is electrically connected with the first diode D1 negative electrode and first switch pipe S1 one end, the first diode D1 anode and inversion mould The bus capacitor negative pole end 4b electrical connections of block 4;

The input of the first switch pipe S1 other end and the positive terminal PV+ of photovoltaic array 1 and bus isolation module 3 is electrically connected Connect, the output end of bus isolation module 3 is electrically connected with the bus capacitor positive terminal 4a of inversion module 4;

Bus isolation module 3 turns on photovoltaic array when photovoltaic array 1 inputs the first d. c. voltage signal to voltage changing module 2 1 positive terminal PV+ and the bus capacitor positive terminal 4a of inversion module 4, and stop in photovoltaic array 1 inputting to voltage changing module 2 Isolate bus capacitor positive terminal 4as of the positive terminal PV+ with inversion module 4 of photovoltaic array 1 during the first d. c. voltage signal.

So-called common-anode connected mode refers to the positive terminal PV+ of photovoltaic array 1 and the electrode input end of voltage changing module 2 and defeated Go out end to be joined directly together.

In common-anode connected mode, bus isolation module 3 inputs the first DC voltage in photovoltaic array to voltage changing module 2 Bus capacitor positive terminal 4as of the positive terminal PV+ with inversion module 4 of photovoltaic array 1 is turned on during signal, and is stopped in photovoltaic array 1 The positive terminal PV+ and inversion module 4 of isolation photovoltaic array 1 bus when only inputting the first d. c. voltage signal to voltage changing module 2 Capacitance cathode end 4a.

Under common-anode connected mode, the annexation of the device that bus isolation module 3 includes and other devices is as follows:

Referring to Fig. 5, when bus isolation module 3 includes the second diode D2, the second diode D2 anode and photovoltaic battle array The positive terminal PV+ electrical connections of row 1, negative electrode is electrically connected with the bus capacitor positive terminal 4a of inversion module 4;Or,

Referring to Fig. 6, when bus isolation module 3 includes second switch pipe S2, second switch pipe S2 one end and photovoltaic array 1 Positive terminal PV+ electrical connections, the other end electrically connects with the bus capacitor positive terminal 4a of inversion module 4;Second switch pipe S2 is in light Photovoltaic array 1 is closed when inputting the first d. c. voltage signal to voltage changing module 2, to turn on positive terminal PV+ and the inversion of photovoltaic array 1 The bus capacitor positive terminal 4a of module 4, and when photovoltaic array 1 stops inputting the first d. c. voltage signal to voltage changing module 2 Disconnect, to isolate the positive terminal PV+ of photovoltaic array 1 and the bus capacitor positive terminal 4a of inversion module 4;Or,

Referring to Fig. 7, bus isolation module 3 includes the second diode D2 and second switch pipe S2, the second diode D2 sun Pole and second switch pipe S2 one end are electrically connected with the positive terminal PV+ of photovoltaic array 1, and the second diode D2 negative electrode and second is opened The other end for closing pipe S2 is electrically connected with the bus capacitor positive terminal 4a of inversion module 4;Second switch pipe S2 is in photovoltaic array 1 to change Die block 2 is closed when inputting the first d. c. voltage signal, to turn on the positive terminal PV+ of photovoltaic array 1 and the bus of inversion module 4 Capacitance cathode end 4a, and disconnected when photovoltaic array 1 stops and inputs the first d. c. voltage signal to voltage changing module 2, to isolate The positive terminal PV+ of the photovoltaic array 1 and bus capacitor positive terminal 4a of inversion module 4.

The photovoltaic devices that the present embodiment is provided also include:Power module 5 is compensated, compensation power module 5 has the following two kinds real Existing mode includes:

The first, referring to Fig. 8, one end of compensation power module 5 electrically connect with the negative pole end PE- of photovoltaic array 1, compensates electric The other end of source module 5 is electrically connected with earth terminal;Compensation power module 1 is used to, to the input positive voltage signal of photovoltaic array 1 is stated, lead to Cross the positive voltage signal to repair photovoltaic array 1, to recover the power output of photovoltaic array 1.In this manner, compensate Voltage module 1 can be dc source.

Secondth, referring to Fig. 9, when the other end of compensation power module 5 is electrically connected with power network, power module 5 is compensated by electricity Net input ac voltage signal change direct current positive voltage signal, then to state photovoltaic array 1 input positive voltage signal.Positive electricity Pressure signal is flowed into the positive terminal PV+ of photovoltaic array 1 from the negative pole end PV- of photovoltaic array 1, and photovoltaic array 1 can be repaiied It is multiple.

When it is second of implementation to compensate power module 5, referring to Figure 10, compensation power module 5 can be rectified current Road, including:

3rd electric capacity C3, the 4th electric capacity C4 and AC DC modular converter 51;

AC DC modular converter 51 is connected with power network, the 3rd electric capacity C3 one end and the negative pole end PV- of photovoltaic array 1 and The first output end electrical connection of AC DC modular converter 51, the of the 4th electric capacity C4 one end and AC DC modular converter 51 Two output ends are electrically connected, the other end electrical connection of the 3rd electric capacity the C3 other end and the 4th electric capacity C4.

The ac voltage signal that AC DC modular converter 51 inputs power network changes the positive voltage signal of direct current, Ran Houxiang State the input positive voltage signal of photovoltaic array 1.

In one embodiment of the application, because photovoltaic generating system includes:Photovoltaic array, voltage changing module, bus every From module and inversion module;Photovoltaic array is connected with voltage changing module, and voltage changing module is also connected with bus isolation module, bus isolation Module is also connected with inversion module;Bus isolation module inputs the first DC voltage of its generation in photovoltaic array to voltage changing module Voltage changing module and inversion module are turned on during signal, the first d. c. voltage signal is converted to the second DC voltage by voltage changing module to be believed Number, the second d. c. voltage signal is inputted to inversion module, the second d. c. voltage signal is converted to alternating voltage by inversion module to be believed Number;Bus isolation module photovoltaic array stop to voltage changing module input the first d. c. voltage signal when isolation voltage changing module with it is inverse Become module.Because bus isolation module isolates transformation when photovoltaic array stops and inputs the first d. c. voltage signal to voltage changing module Negative current signal on module and inversion module, such inversion module can not be flowed into photovoltaic array, it is to avoid by photovoltaic array Positive terminal and earth terminal between voltage and negative pole end and earth terminal between voltage down for negative voltage, so as to avoid light Photovoltaic array goes out PID effects and power output decay.

The foregoing is only the example of the application, not to limit the application, it is all spirit herein and principle it Interior, any modification, equivalent substitution and improvements made etc. should be included within the protection domain of the application.

Claims (9)

1. a kind of photovoltaic generating system, it is characterised in that including:
Photovoltaic array, voltage changing module, bus isolation module and inversion module;
The photovoltaic array is connected with the voltage changing module, and the voltage changing module is also connected with the bus isolation module, described Bus isolation module is also connected with the inversion module;
The bus isolation module inputs the first d. c. voltage signal of its generation in the photovoltaic array to the voltage changing module When turn on the voltage changing module and the inversion module, first d. c. voltage signal is converted to second by the voltage changing module D. c. voltage signal, second d. c. voltage signal is inputted to the inversion module, and the inversion module is straight by described second Stream voltage signal is converted to ac voltage signal;
The bus isolation module stops inputting first d. c. voltage signal to the voltage changing module in the photovoltaic array When isolate the voltage changing module and the inversion module.
2. photovoltaic generating system as claimed in claim 1, it is characterised in that the voltage changing module includes:
Inductance, the first diode and first switch pipe;
One end of the inductance is electrically connected with the positive terminal of the photovoltaic array, the anode of the other end and first diode and One end electrical connection of the first switch pipe, the negative electrode of first diode and the bus capacitor positive terminal of the inversion module Electrical connection;
One end of the other end of the first switch pipe and the negative pole end of the photovoltaic array and the bus isolation module is electrically connected Connect, the other end of the bus isolation module is electrically connected with the bus capacitor negative pole end of the inversion module;
The bus isolation module turns on institute when the photovoltaic array inputs the first d. c. voltage signal to the voltage changing module The negative pole end of photovoltaic array and the bus capacitor negative pole end of the inversion module are stated, and is stopped in the photovoltaic array to described Voltage changing module isolates the negative pole end of the photovoltaic array and the bus electricity of the inversion module when inputting the first d. c. voltage signal Hold negative pole end.
3. photovoltaic generating system as claimed in claim 2, it is characterised in that
The bus isolation module includes the second diode, the negative electrode of second diode and the negative pole end of the photovoltaic array Electrical connection, anode is electrically connected with the bus capacitor negative pole end of the inversion module;Or,
The bus isolation module includes second switch pipe, one end of the second switch pipe and the negative pole end of the photovoltaic array Electrical connection, the other end is electrically connected with the bus capacitor negative pole end of the inversion module;The second switch pipe is in photovoltaic battle array Arrange and closed when inputting the first d. c. voltage signal to the voltage changing module, and stop in the photovoltaic array to the change pressing mold Block disconnects when inputting the first d. c. voltage signal;Or,
The bus isolation module includes the second diode and second switch pipe, the negative electrode of second diode and described second One end of switching tube is electrically connected with the negative pole end of the photovoltaic array, the anode of second diode and the second switch pipe The other end electrically connected with the bus capacitor negative pole end of the inversion module;The second switch pipe is in the photovoltaic array to institute State when voltage changing module inputs the first d. c. voltage signal and close, and stop in the photovoltaic array to voltage changing module input Disconnected during the first d. c. voltage signal.
4. photovoltaic generating system as claimed in claim 1, it is characterised in that the voltage changing module includes:
Inductance, the first diode and first switch pipe;
One end of the inductance is electrically connected with the negative pole end of the photovoltaic array, the negative electrode of the other end and first diode and One end electrical connection of the first switch pipe, the anode of first diode and the bus capacitor negative pole end of the inversion module Electrical connection;
One end of the other end of the first switch pipe and the positive terminal of the photovoltaic array and the bus isolation module is electrically connected Connect, the other end of the bus isolation module is electrically connected with the bus capacitor positive terminal of the inversion module;
The bus isolation module turns on institute when the photovoltaic array inputs the first d. c. voltage signal to the voltage changing module The positive terminal of photovoltaic array and the bus capacitor positive terminal of the inversion module are stated, and is stopped in the photovoltaic array to described Voltage changing module isolates the positive terminal of the photovoltaic array and the bus electricity of the inversion module when inputting the first d. c. voltage signal Hold positive terminal.
5. photovoltaic generating system as claimed in claim 4, it is characterised in that
The bus isolation module includes the second diode, the anode of second diode and the positive terminal of the photovoltaic array Electrical connection, negative electrode is electrically connected with the bus capacitor positive terminal of the inversion module;Or,
The bus isolation module includes second switch pipe, one end of the second switch pipe and the positive terminal of the photovoltaic array Electrical connection, the other end is electrically connected with the bus capacitor positive terminal of the inversion module;The second switch pipe is in photovoltaic battle array Arrange and closed when inputting the first d. c. voltage signal to the voltage changing module, and stop in the photovoltaic array to the change pressing mold Block disconnects when inputting the first d. c. voltage signal;Or,
The bus isolation module includes the second diode and second switch pipe, the anode of second diode and described second One end of switching tube is electrically connected with the positive terminal of the photovoltaic array, the negative electrode of second diode and the second switch pipe The other end electrically connected with the bus capacitor positive terminal of the inversion module;The second switch pipe is in the photovoltaic array to institute State when voltage changing module inputs the first d. c. voltage signal and close, and stop in the photovoltaic array to voltage changing module input Disconnected during the first d. c. voltage signal.
6. the photovoltaic generating system as described in any one of claim 1 to 5 claim, it is characterised in that also include:
Power module is compensated, one end of the compensation power module is electrically connected with the negative pole end of the photovoltaic array, the compensation The other end of power module is electrically connected with earth terminal;The compensation power module is used for photovoltaic array input positive voltage letter Number.
7. photovoltaic generating system as claimed in claim 6, it is characterised in that the compensation power module is dc source.
8. the photovoltaic generating system as described in any one of claim 1 to 5 claim, it is characterised in that also include:
Power module is compensated, one end of the compensation power module is electrically connected with the negative pole end of the photovoltaic array, the compensation The other end of power module is connected with power network;The ac voltage signal that the compensation power module is used to convey in the power network turns Positive direct-current voltages signal is changed to, the positive direct-current voltages signal is inputted to the photovoltaic array.
9. photovoltaic generating system as claimed in claim 8, it is characterised in that the compensation power module is rectification circuit.
CN201710330741.XA 2017-05-11 2017-05-11 A kind of photovoltaic generating system CN107230997A (en)

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CN104242811A (en) * 2014-09-24 2014-12-24 彭书芳 Photovoltaic power supply system
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CN104578875A (en) * 2014-11-19 2015-04-29 南京信息职业技术学院 Direct-current input circuit for photovoltaic inverter
CN105915172A (en) * 2016-05-11 2016-08-31 阳光电源股份有限公司 Device and method of inhibiting potential induced degeneration
US20160329720A1 (en) * 2013-03-15 2016-11-10 Ampt, Llc Magnetically Coupled Solar Power Supply System
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202334349U (en) * 2011-11-24 2012-07-11 深圳古瑞瓦特新能源有限公司 Direct current isolated grid-connected inversion circuit and photovoltaic inversion system
US20160329720A1 (en) * 2013-03-15 2016-11-10 Ampt, Llc Magnetically Coupled Solar Power Supply System
CN104242811A (en) * 2014-09-24 2014-12-24 彭书芳 Photovoltaic power supply system
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