CN207098966U - A kind of PV combining inverters based on charge pump circuit - Google Patents
A kind of PV combining inverters based on charge pump circuit Download PDFInfo
- Publication number
- CN207098966U CN207098966U CN201720624085.XU CN201720624085U CN207098966U CN 207098966 U CN207098966 U CN 207098966U CN 201720624085 U CN201720624085 U CN 201720624085U CN 207098966 U CN207098966 U CN 207098966U
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- China
- Prior art keywords
- side filter
- switching tube
- inverter
- charge pump
- pump circuit
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The utility model provides a kind of PV combining inverters based on charge pump circuit, including photovoltaic module VPV, power network VgWith middle inverter link, it is characterised in that the inverter link includes boost booster circuits, DC ripple electric capacity C0, DC bus-bar voltage Vdc, by four power switch pipes, two diodes, two capacitor banks into charge pump circuit, inverter side filter inductance Lf, grid side filter inductance Lg, outlet side filter capacitor Cf, wherein, photovoltaic array is connected with boost booster circuits, DC ripple electric capacity C0It is in parallel with boost booster circuits, a port and the DC ripple electric capacity C of the charge pump circuit0In parallel, another port and the inverter side filter inductance LfConnection, the inverter side filter inductance LfWith the grid side filter inductance Lg, the outlet side filter capacitor CfConnection, the grid side filter inductance LgIt is connected on power network.The utility model solves the deficiency of conventional inverter.
Description
Technical field
Distributed photovoltaic grid-connected system field is the utility model is related to, particularly a kind of PV based on charge pump circuit is grid-connected
Inverter.
Background technology
In recent years, photovoltaic generation was cleaned without discharge with it, installs the features such as simple maintenance, noiseless by brainstrust
Extensive concern.However, the presence due to big parasitic capacitance between photovoltaic panel and the earth, it will reduce the efficiency of system and
Shock hazard may be caused, have a strong impact on personal safety.
In order to eliminate leakage current, transformer is generally added in systems to provide electrical isolation, however, the presence of transformer
Some row unfavorable conditions will be derived, as volume weight is big, cost is high, loss is more.Therefore, the presence of eliminating transformer will
It is following research direction.
The content of the invention
Technical problem to be solved in the utility model is to provide a kind of PV combining inverters based on charge pump circuit, energy
Enough solve the problems, such as to cause leakage current to produce due to the presence of parasitic capacitance between photovoltaic panel and the earth, and integrated cost,
The factors such as volume, efficiency, there is provided a kind of prioritization scheme, and with the ability to electrical grid transmission reactive power.
In order to solve the above technical problems, technical scheme is used by the utility model：It is a kind of based on charge pump circuit
PV combining inverters, including photovoltaic module VPV, power network VgWith middle inverter link, it is characterised in that the inverter link
Include boost booster circuits, DC ripple electric capacity C0, DC bus-bar voltage Vdc, by four power switch pipes, two diodes,
Two capacitor banks into charge pump circuit, inverter side filter inductance Lf, grid side filter inductance Lg, outlet side filter capacitor
Cf, wherein, photovoltaic array is connected with boost booster circuits, DC ripple electric capacity C0It is in parallel with boost booster circuits, the electric charge
The a port of pump circuit and DC ripple electric capacity C0In parallel, another port and the inverter side filter inductance LfConnection, institute
State inverter side filter inductance LfWith the grid side filter inductance Lg, the outlet side filter capacitor CfConnection, the grid side
Filter inductance LgIt is connected on power network.
Preferably, four power switch pipes include first switch pipe S1, second switch pipe S2, the 3rd switching tube S3
And the 4th switching tube S4, first switch pipe S1 drain electrode and DC bus-bar voltage VdcPositive pole connection, the first switch pipe S1
Source electrode the drain electrode with second switch pipe S2, the 3rd switching tube S3 drain electrode, the first electric capacitor C1 positive pole are connected respectively, institute
State second switch pipe S2 source electrode respectively with inverter side filter inductance Lf, the 4th switching tube S4 drain electrode connection, the described 3rd
Switching tube S3 source electrode respectively with DC bus-bar voltage VdcNegative pole, the second diode D2 negative electrode, the second electric capacitor C2
Positive pole connects, the negative pole of the first electric capacitor C1 negative electrode with the first diode D1, the second diode D2 anode respectively
Connection, the anode with the first diode D1, the second electric capacitor C2 negative pole are connected the source electrode of the 4th switching tube S4 respectively.
Preferably, the first electric capacitor C1 and the second electric capacitor C2 select alminium electrolytic condenser.
Preferably, four power switch Guan Jun are using the mosfet pipes for being parallel with diode.
Preferably, the switching tube modulation strategy uses Unipolar SPWM technology.
The utility model provides a kind of PV combining inverters based on charge pump circuit, by neutral point of electric network directly and electric charge
The negative terminal of pump circuit is connected, make it is directly in parallel with zero potential by the voltage in parasitic capacitance, so as to reach eliminate
The purpose of leakage current.The utility model had both solved the deficiency of conventional inverter, had the following advantages again：Circuit structure is fundamentally
Leakage current is eliminated, therefore the modulation strategy of switching tube is unrestricted；Only with four switching tubes, installation cost is reduced；It is defeated
It is three level to go out voltage, so as to reduce output current ripple, improves the quality of power supply；Under running status, electric current flows only through two
Individual switching tube, therefore reduce switching tube conduction loss；Can be to electrical grid transmission reactive power.
Brief description of the drawings
The utility model is described in further detail with reference to the accompanying drawings and examples：
Fig. 1 is the structural representation based on charge pump circuit.
Fig. 2 is structural representation of the present utility model.
Fig. 3 a are that the output voltage of the inverter of region I is VBoFor+VdcSituation.
Fig. 3 b are the output voltage V of the inverter of region IBoBy for 0 situation.
Fig. 4 c are that the output voltage of region II inverter is VBoFor-VdcSituation.
Fig. 4 d are that the output voltage of region II inverter is VBoFor 0 situation.
Fig. 5 e are that the output voltage of region III inverter is VBoFor-VdcSituation.
The output voltage of Fig. 5 f region III inverters is VBoFor 0 situation.
Fig. 6 g are the output voltage V of the inverter of region IVBoFor+VdcSituation.
Fig. 6 h are the output voltage V of the inverter of region IVBoFor 0 situation.
Embodiment
As shown in Figure 1-2, a kind of PV combining inverters based on charge pump circuit, including photovoltaic module VPV, power network VgWith
Middle inverter link, it is characterised in that the inverter link includes boost booster circuits, DC ripple electric capacity C0, direct current
Busbar voltage Vdc, by four power switch pipes, two diodes, two capacitor banks into charge pump circuit, inverter side filter
Ripple inductance Lf, grid side filter inductance Lg, outlet side filter capacitor Cf, wherein, photovoltaic array is connected with boost booster circuits, directly
Flow liner ripple electric capacity C0It is in parallel with boost booster circuits, a port and the DC ripple electric capacity C of the charge pump circuit0In parallel,
Another port and the inverter side filter inductance LfConnection, the inverter side filter inductance LfFiltered with the grid side
Inductance Lg, the outlet side filter capacitor CfConnection, the grid side filter inductance LgIt is connected on power network.
Specifically, the drain electrode of the first switch pipe S1 and DC bus-bar voltage VdcPositive pole connection, the first switch
Pipe S1 the source electrode drain electrode with second switch pipe S2, the 3rd switching tube S3 drain electrode, the first electric capacitor C1 positive pole phase respectively
Even, the source electrode of the second switch pipe S2 respectively with inverter side filter inductance Lf, the 4th switching tube S4 drain electrode connection, institute
State the 3rd switching tube S3 source electrode respectively with DC bus-bar voltage VdcNegative pole, the second diode D2 negative electrode, the second electric power electricity
Hold C2 positive pole connection, the negative pole of the first electric capacitor C1 negative electrode with the first diode D1, the second diode D2 respectively
Anode connection, the source electrode of the 4th switching tube S4 respectively the anode with the first diode D1, the second electric capacitor C2 it is negative
Pole connects.
Specifically, according to inverter output voltage and sense of current, the running status of the inverter of proposition can be divided into
Four regions, this four regions can be described as：
Region I：Inverter output voltage and output current are that just, energy is transferred to grid side from dc bus side.
Region II：Inverter output voltage is negative, and output current is just, energy is transferred to dc bus side from grid side.
Region III：Inverter output voltage and output current are negative, and energy is transferred to grid side from dc bus side.
Region IV：Inverter output voltage is just, output current is negative, and energy is transferred to dc bus from grid side
Side.
The modulator approach of present embodiment is：In region I and region IV, switching tube S1 and switching tube S3 are with switching frequency
Fs is alternately turned on and off, and so as to export positive voltage and no-voltage, S2 remains open mode in whole positive half period.When
When switching tube S1 and switching tube S2 are opened, the output voltage V of inverterBnTo be+Vdc, such as Fig. 3 a) and Fig. 6 g), in this section
Interior, the first diode D1 bears reversed bias voltage and by, the second diode D2 forward conduction, therefore the first electric capacitor C1 leads to
The second diode D2 chargings are crossed, and the second electric capacitor C2 voltage keeps a constant constant；As switching tube S2 and switching tube S3
When opening, the output voltage V of inverterBnTo be 0, such as Fig. 3 b) and Fig. 6 h), now under no-voltage output state, the first electric power electricity
It is in parallel with the second electric capacitor C2 by the first diode D1 to hold C1, therefore passes through charge pump circuit, the first C1 pairs of electric capacitor
Second electric capacitor C2 discharges, and finally provides a negative level voltage for the second electric capacitor C2.
In region II and region III, by output negative voltage and no-voltage.Such as Fig. 4 c) and Fig. 5 e) be switching tube S1 and
Equivalent circuit when switching tube S4 is opened, when switching tube S4 is opened, the voltage by the second electric capacitor C2 is inversion
The output voltage of device, now, VBn=-Vdc, inverter output negative voltage is produced by the second electric capacitor C2, in this state
Under, switching tube S1 and switching tube S4 are opened and turned off simultaneously, in addition, be constant to keep the first electric capacitor C1 voltage,
Make DC ripple electric capacity C0The first electric capacitor C1 is charged by switching tube S1.At this stage, no-voltage output state
Situation and similar, such as Fig. 4 d during line voltage positive half period) and Fig. 5 f).
Analyzed based on more than, according to the relation of output voltage and electric current, the utility model proposes one kind be based on charge pump
The PV combining inverters of circuit, there are three kinds of operation orders in it:If operation order is：I → III, then invertor operation is in unit
Under power factor state (PF=1).
If operation order is：IV → I → II → III, then invertor operation is in electric current hysteretic state.
If operation order is：I → IV → III → II, then invertor operation is in electric current Lead conditions.
From the working method of charge pump circuit, the second electric capacitor C2 charge constant is represented by：
τC2=RC2CC2 (1)
RC2And CC2Respectively：
RC2=RD1+RS3+RC1+RC2
RC1And RC2To be respectively the first electric capacitor C1, the second electric capacitor C2 equivalent series resistance, RS3Opened for the 3rd
Close equivalent resistance during pipe S3 conducting states, RD1For the first diode D1 resistance value.
Therefore, it is represented by by the electric current of capacitor：
According to formula (1), C2 charge constant is bigger than nature discharge time constant, and V at steady stateC1-
VC2Value very little, according to formula (3) understand, flow through the dash current value very little of capacitor, therefore, the utility model can improve electricity
The service life of container, therefore select the alminium electrolytic condenser more slightly larger than design load.
Claims (4)
1. a kind of PV combining inverters based on charge pump circuit, including photovoltaic module VPV, power network VgWith middle inverter link,
Characterized in that, the inverter link includes boost booster circuits, DC ripple electric capacity C0, DC bus-bar voltage Vdc, by four
Individual power switch pipe, two diodes, two capacitor banks into charge pump circuit, inverter side filter inductance Lf, grid side
Filter inductance Lg, outlet side filter capacitor Cf, wherein, photovoltaic array is connected with boost booster circuits, DC ripple electric capacity C0With
Boost booster circuits are in parallel, a port and the DC ripple electric capacity C of the charge pump circuit0In parallel, another port and institute
State inverter side filter inductance LfConnection, the inverter side filter inductance LfWith the grid side filter inductance Lg, the output
Side filter capacitor CfConnection, the grid side filter inductance LgIt is connected on power network.
A kind of 2. PV combining inverters based on charge pump circuit according to claim 1, it is characterised in that：Four electricity
Power switching tube includes first switch pipe S1, second switch pipe S2, the 3rd switching tube S3 and the 4th switching tube S4, first switch pipe S1
Drain electrode and DC bus-bar voltage VdcPositive pole connection, the source electrode leakage with second switch pipe S2 respectively of the first switch pipe S1
Pole, the 3rd switching tube S3 drain electrode, the first electric capacitor C1 positive pole are connected, the source electrode of the second switch pipe S2 respectively with it is inverse
Become device side filter inductance Lf, the 4th switching tube S4 drain electrode connection, the source electrode of the 3rd switching tube S3 respectively with dc bus
Voltage VdcNegative pole, the second diode D2 negative electrode, the second electric capacitor C2 positive pole connection, the first electric capacitor C1's
The negative electrode with the first diode D1, the second diode D2 anode are connected negative pole respectively, the source electrode point of the 4th switching tube S4
Anode, the second electric capacitor C2 negative pole not with the first diode D1 are connected.
A kind of 3. PV combining inverters based on charge pump circuit according to claim 2, it is characterised in that：First electricity
Power electric capacity C1 and the second electric capacitor C2 select alminium electrolytic condenser.
A kind of 4. PV combining inverters based on charge pump circuit according to claim 2, it is characterised in that：Four electricity
Power switching tube is using the mosfet pipes for being parallel with diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720624085.XU CN207098966U (en) | 2017-06-01 | 2017-06-01 | A kind of PV combining inverters based on charge pump circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720624085.XU CN207098966U (en) | 2017-06-01 | 2017-06-01 | A kind of PV combining inverters based on charge pump circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207098966U true CN207098966U (en) | 2018-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720624085.XU Expired - Fee Related CN207098966U (en) | 2017-06-01 | 2017-06-01 | A kind of PV combining inverters based on charge pump circuit |
Country Status (1)
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| CN (1) | CN207098966U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818495A (en) * | 2019-03-14 | 2019-05-28 | 阳光电源股份有限公司 | Group string inverter and its boost chopper control method |
-
2017
- 2017-06-01 CN CN201720624085.XU patent/CN207098966U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109818495A (en) * | 2019-03-14 | 2019-05-28 | 阳光电源股份有限公司 | Group string inverter and its boost chopper control method |
| CN109818495B (en) * | 2019-03-14 | 2020-05-22 | 阳光电源股份有限公司 | String inverter and boost chopper circuit control method thereof |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180313 Termination date: 20190601 |