CN204859029U - Novel single -phase photovoltaic contravariant leakage current restraines topological structure - Google Patents
Novel single -phase photovoltaic contravariant leakage current restraines topological structure Download PDFInfo
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- CN204859029U CN204859029U CN201520553932.9U CN201520553932U CN204859029U CN 204859029 U CN204859029 U CN 204859029U CN 201520553932 U CN201520553932 U CN 201520553932U CN 204859029 U CN204859029 U CN 204859029U
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- 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
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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
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Abstract
The utility model relates to a novel single -phase photovoltaic contravariant leakage current restraines topological structure, a serial communication port, include: switch tube S1, S2, S3, S4, S5, S6, diode D1, D2, the direct current supports electric capacity CDC. Two bridge arms were not direct about switch tube S2, S3, diode D1, D2 guaranteed, the normal during operation of high frequency, two switch tubes of only flowing through, the more ordinary H6 circuit of the loss that causes is little. Novel single -phase photovoltaic contravariant leakage current restraines topological structure, suppress the ground leakage current through increase common mode return circuit impedance, not only kept the topological efficient advantage of non - isolation contravariant, avoid appearing greatly to the ground leakage current in addition.
Description
Technical field
The utility model belongs to electrical engineering photovoltaic inversion field, specifically a kind of New single-phase photovoltaic inversion drain current suppressing topological structure.
Background technology
China is a resource consumption big country, and rapid advancement and development with China's industry in the last few years, China are more and more stronger to the dependence of resource.But energy environment increasingly deteriorates, traditional energy is petered out, and energy shortage has directly threatened the sustainable development of China.
In many new energy such as water energy, wind energy, ocean energy, geothermal energy, solar energy, solar energy is most potential, and it is a kind of inexhaustible, nexhaustible sanitary safe regenerative resource.Photovoltaic generation is one of main application of the current artificial sun energy energy, photovoltaic DC-to-AC converter is then the key component of photovoltaic generation, the direct current that photovoltaic battery panel (array) is sent is converted to alternating current by it, and supply power network (grid-connected) or load use (off-network).
In traditional photovoltaic combining inverter, Industrial Frequency Transformer can be typically added at output, to realize buffer action.But Industrial Frequency Transformer cost is high, loss is big, and the delivery efficiency to photovoltaic combining inverter has a great impact.Therefore it is now to use non-isolated photovoltaic inverter circuit in order to improve delivery efficiency more.The topological structure of non-isolated photovoltaic inverter circuit reduces manufacturing cost due to eliminating Industrial Frequency Transformer, the advantages of possessing efficiency high, lightweight, small volume, is highly suitable for small-power photovoltaic inverting system.But, the problem of isolation element (Industrial Frequency Transformer) similarly brings one seriously is omitted, i.e., it is possible that larger Ground leakage current in system.
The essence of leakage current is common mode current, and its generation is due to that parasitic capacitance is there are between photovoltaic inverting system and the earth, during grid-connected work, and loop is formed between parasitic capacitance, photovoltaic inverting system and power network, and common-mode voltage can produce common mode current in parasitic capacitance.
In the isolation photovoltaic inverting system with Industrial Frequency Transformer, because parasitic capacitance impedance is larger between the winding of the Industrial Frequency Transformer in loop, equivalent to worn in the loop in an electric capacity, loop because common-mode voltage produce common mode current can correspondingly be suppressed.
And in non-isolated photovoltaic inverting system, impedance loop is relatively small, common-mode voltage can produce larger leakage current in the parasitic capacitance between non-isolated photovoltaic inverting system and the earth.
Therefore, the problems such as leakage current in non-isolated photovoltaic inverting system can not only cause grid-connected current distortion, electromagnetic interference, it is also possible to which the personal safety to user constitutes a threat to.
Traditional full bridge inverter is as shown in figure 1, the full bridge inverter constitutes two bridge arms by four switching tubes S1, S2, S3, S4, and the midpoint of bridge arm is respectively through filter inductance La、Lb, connected with L, N line (L is phase line, and N is the neutral conductor) of load or power network, C in Fig. 1DCFor dc bus Support Capacitor.In the program, four switching tubes are operated in high frequency state.DC current is modulated after (sinusoidal pulse width modulation) through full bridge inverter by SPWM, exports the alternating current of high frequency, after exporting LC filtering, obtains 50Hz (or 60Hz) industrial-frequency alternating current.
The common mode leakage current loop of traditional full bridge inverter is as shown in Fig. 2 Ra、RbFor line impedance.Each point (referring to upper and lower bridge arm midpoint) is grounded by stray capacitance.It is simplified to obtain Fig. 3 institutes representation model.
Total common-mode voltage has：
Formula 1
In formula, VcmFor loop common-mode voltage, VdmFor loop differential mode voltage.VtcmFor loop differential mode voltage and common-mode voltage sum, total common-mode voltage can be regarded as.VaFor upper bridge arm midpoint voltage, VbFor lower bridge arm midpoint voltage, ZaAnd ZbFor the impedance on L and the lines of N two.
Simplified model and formula 1 be as can be seen that the common-mode voltage and the joint effect of differential mode voltage that common mode current is exported by bridge arm midpoint as shown in Figure 3, wherein, the action effect of differential mode voltage is relevant with the value of the filter inductance of two bridge arm outlet sides：As grid-connected filter inductance La、LbWhen value is different, differential mode voltage VdmCan be to total common-mode voltage VtcmProduce influence；As grid-connected filter inductance La、LbWhen value is identical, then differential mode voltage VdmDo not work, formula 1 can be reduced to
Formula 2
Common mode current (i.e. leakage current) i that total common-mode voltage is producedcm, its value and parasitic capacitance CpvWith common-mode voltage variation rate dVtcm/ dt is directly proportional.Its expression formula is：
Formula 3
Analyzed more than, for traditional single phase non-isolated photovoltaic grid-connected inverter topology, leakage current effectively suppresses there are two primary conditions, and one is that each bridge arm parameter is symmetrical, and inductance value is chosen consistent；Two are so that common-mode voltage keeps constant.
Table 1 provides single-phase inverter on off state and common-mode voltage VcmBetween relation.
The single-phase inverter on off state of table 1 and common-mode voltage relation
In table：
Sa、SbRepresent open-minded for upper and lower bridge arm on off state, 1,0 is shut-off,
SabFor output state, S can be regarded asa-Sb, 1 represents to be output as just, and 0 is no output, and -1 represents to be output as bearing,
VaFor upper bridge arm output voltage,
VbFor lower bridge arm output voltage,
VcmFor common-mode voltage.
VDCFor input direct voltage.
Modulator approach is analyzed to common mode current i below according to table 1cmInfluence.
Single-phase full bridge inversion PWM, in general, is segmented into bipolar modulation and unipolarity modulation.
For bipolar modulation, total output state SabOnly have two kinds of feelings in addition：- 1 and 1, and under both states, common-mode voltage is all 0.5VDC, it can be seen from formula 3, common-mode voltage variation rate is 0, so common mode current is 0 during bipolar modulation；
Output state S in unipolarity modulation (including frequency multiplication)ab0 situation can be included so that its common-mode voltage is in 0.5VDC、VDCAnd change between 0, therefore, it can be seen from formula 3, common-mode voltage variation rate is not 0, so there is leakage current during unipolarity modulation.
When using unipolarity modulation, serious Ground leakage current can be caused.And bipolar modulation is used, the problems such as output ripple is excessive can be caused.
The technical scheme H6 topology close with scheme shown in Fig. 1~3 is as shown in Figure 4.Its operation principle is as follows：
In positive half period：Switching tube S1 remains open-minded, and switching tube S3 and S6 are operated in switching frequency state, and remaining is turned off all the time.When S3 and S6 are opened, input side flows through switching tube S3, S1 and S6 formation loop, a point voltages VaEqual to VDC, b point voltages VbEqual to 0, now VtcmEqual to 0.5VDC；When switching tube S3 and S6 are turned off, electric current flows through switching tube S1 and diode D1 formation loop, now a point voltages VaEqual to 0.5VDC, b point voltages VbIt is also equal to 0.5VDC, now VtcmEqual to 0.5VDC。
In negative half-cycle：Switching tube S5 remains open-minded, and switching tube S4 and S2 are operated in switching frequency state, and remaining is turned off all the time.When switching tube S4 and S2 are opened, input side flows through switching tube S4, S5 and S2 formation loop, a point voltages VaEqual to 0, b point voltages VbEqual to VDC, now VtcmEqual to 0.5VDC；When switching tube S4 and S2 are turned off, electric current flows through switching tube S5 and diode D2 formation loop, now a point voltages VaEqual to 0.5VDC, b point voltages VbIt is also equal to 0.5VDC, now VtcmEqual to 0.5VDC.Because common-mode voltage keeps 0.5V within each cycleDCConstant, it can be seen from formula 3, leakage current is zero.
The shortcoming of scheme shown in Fig. 4 is：When high frequency state works, electric current need to flow through 3 switching tubes, and the loss thereby resulted in can be higher than under full bridge inverter (scheme shown in Fig. 1).
Utility model content
For defect present in prior art; the purpose of this utility model is to provide a kind of New single-phase photovoltaic inversion drain current suppressing topological structure; suppress Ground leakage current by increasing common mode impedance loop; the efficient advantage of non-isolated inversion topological is not only remained, and avoids the occurrence of larger Ground leakage current.
To achieve the above objectives, the utility model is adopted the technical scheme that：
A kind of New single-phase photovoltaic inversion drain current suppressing topological structure, it is characterised in that including：
Switching tube S1, S2, S3, S4, S5, S6,
Diode D1, D2,
DC support electric capacity CDC,
Switching tube S1 emitter stage is connected with switching tube S3 emitter stage, tie point as a points,
Switching tube S3 colelctor electrode is connected with switching tube S4 colelctor electrode,
Switching tube S4 emitter stage is connected with switching tube S5 colelctor electrode, tie point as c points,
Switching tube S1 colelctor electrode and switching tube S2 colelctor electrode connection,
The emitter stage connection of switching tube S5 emitter stage and switching tube S6,
Switching tube S2 emitter stage and diode D1 positive pole connection, tie point as b points,
Switching tube S6 colelctor electrode and the connection of diode D2 positive pole, tie point as d points,
The negative pole connection of diode D1 negative pole and diode D2,
Tie point a points and the connection of tie point d points,
Tie point b points and the connection of tie point c points,
Switching tube S3, S4 tie point are connected with diode D1, D2 tie point,
DC support electric capacity CDCPositive pole and switching tube S1 colelctor electrode connection, negative pole and switching tube S5 emitter stage connection.
On the basis of above-mentioned technical proposal, described switching tube S1, S2, S3, S4, S5, S6 are IGBT or MOSFET.
On the basis of above-mentioned technical proposal, tie point b points and output inductor LaConnection, tie point d points and output inductor LbConnection.
On the basis of above-mentioned technical proposal, the output inductor La、LbIt is symmetrical and size is identical.
New single-phase photovoltaic inversion drain current suppressing topological structure described in the utility model, Ground leakage current is suppressed by increasing common mode impedance loop, not only remains the efficient advantage of non-isolated inversion topological, and avoids the occurrence of larger Ground leakage current.
Brief description of the drawings
The utility model has drawings described below：
Full bridge inverter schematic diagram traditional Fig. 1,
The common mode leakage current circuit diagram of full bridge inverter traditional Fig. 2,
Fig. 3 Fig. 2 simplified model,
Fig. 4 H6 topology schematic diagrames,
Fig. 5 the utility model schematic diagrames,
Fig. 6 T1 time circuit operating diagrams,
Fig. 7 T2 time circuit operating diagrams,
Fig. 8 T3 time circuit operating diagrams,
Fig. 9 T4 time circuit operating diagrams.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
As shown in Fig. 5~9, New single-phase photovoltaic inversion drain current suppressing topological structure described in the utility model is improved on the basis of original H6 topologys, including：
Switching tube S1, S2, S3, S4, S5, S6,
Diode D1, D2,
DC support electric capacity CDC,
Switching tube S1 emitter stage is connected with switching tube S3 emitter stage, tie point as a points,
Switching tube S3 colelctor electrode is connected with switching tube S4 colelctor electrode,
Switching tube S4 emitter stage is connected with switching tube S5 colelctor electrode, tie point as c points,
Switching tube S1 colelctor electrode and switching tube S2 colelctor electrode connection,
The emitter stage connection of switching tube S5 emitter stage and switching tube S6,
Switching tube S2 emitter stage and diode D1 positive pole connection, tie point as b points,
Switching tube S6 colelctor electrode and the connection of diode D2 positive pole, tie point as d points,
The negative pole connection of diode D1 negative pole and diode D2,
Tie point a points and the connection of tie point d points,
Tie point b points and the connection of tie point c points,
Switching tube S3, S4 tie point are connected with diode D1, D2 tie point,
DC support electric capacity CDCPositive pole and switching tube S1 colelctor electrode connection, negative pole and switching tube S5 emitter stage connection.
On the basis of above-mentioned technical proposal, described switching tube S1, S2, S3, S4, S5, S6 are IGBT (insulated gate bipolar transistor) or MOSFET (Metal-Oxide Semiconductor field-effect transistor).
On the basis of above-mentioned technical proposal, tie point b points and output inductor LaConnection, tie point d points and output inductor LbConnection.
On the basis of above-mentioned technical proposal, the output inductor La、LbIt is symmetrical and size is identical.
The operation principle of the circuit is as follows：
In positive half period, switching tube S4 is open-minded all the time, and switching tube S2, S6 are operated in high frequency state, rest switch tubular type and turned off.
The time that T1 opens for switching tube in positive half period high-frequency work state, as shown in Figure 6.In the period, switching tube S2, S6 are open-minded, and direct current input flows through switching tube S2, inductance La, inductance Lb, switching tube S6 formation loop, the positive half cycle waveform of output exchange.
T2 is the time of switching tube shut-off in positive half period high-frequency work state, as shown in Figure 7.Switching tube S2, S6 are turned off, and inductive current flows through inductance La, inductance Lb, diode D2, switching tube S4 complete no-voltage afterflow (inductive current flow through inductance La, inductance Lb, switching tube S3 anti-paralleled diode, switching tube S4 can also complete afterflow).
In negative half-cycle, switching tube S3 is open-minded all the time, and switching tube S1, S5 are operated in high frequency state, rest switch tubular type and turned off.
The time that T3 opens for switching tube in negative half-cycle high-frequency work state, as shown in Figure 8.Switching tube S1, S5 are open-minded.Direct current input flows through switching tube S1, inductance Lb, inductance La, switching tube S5 formation loop, output exchange negative half period waveform.
T4 is the time of switching tube shut-off in negative half-cycle high-frequency work state, as shown in Figure 9.Switching tube S1, S5 are turned off, and inductive current flows through inductance La, inductance Lb, diode D1, switching tube S3 complete no-voltage afterflow (inductive current flow through inductance La, inductance Lb, switching tube S4 anti-paralleled diode, switching tube S3 can also complete afterflow).
It is the operation principle of one complete cycle of circuit above.
Wherein：Switching tube S2, S3, diode D1, D2 ensure that two bridge arms in left and right are not led directly to.Because switching tube S3, S4 anti-paralleled diode also flow through electric current, so the current capacity to diode D1, D2 requires lower.During high frequency normal work, two switching tubes are only flowed through, the loss caused is small compared with common H6 circuits.
New single-phase photovoltaic inversion drain current suppressing topological structure described in the utility model, can not only play a part of suppressing leakage current, in high-frequency work, the switching tube for flowing through electric current only has two, and the loss caused is smaller.So as to lift the delivery efficiency of photovoltaic inverter circuit.
New single-phase photovoltaic inversion drain current suppressing topological structure described in the utility model, it is configured by the switching tube outside to bridge circuit with diode, form continuous current circuit, ensure simultaneously, during afterflow, net side is realized with the circuit of photovoltaic array side by switching tube shut-off isolates, so that the common code impedance now in circuit is almost limitless big, so as to suppress the size of leakage current.
The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.
Claims (4)
1. a kind of New single-phase photovoltaic inversion drain current suppressing topological structure, it is characterised in that including：
Switching tube S1, S2, S3, S4, S5, S6,
Diode D1, D2,
DC support electric capacity CDC,
Switching tube S1 emitter stage is connected with switching tube S3 emitter stage, tie point as a points,
Switching tube S3 colelctor electrode is connected with switching tube S4 colelctor electrode,
Switching tube S4 emitter stage is connected with switching tube S5 colelctor electrode, tie point as c points,
Switching tube S1 colelctor electrode and switching tube S2 colelctor electrode connection,
The emitter stage connection of switching tube S5 emitter stage and switching tube S6,
Switching tube S2 emitter stage and diode D1 positive pole connection, tie point as b points,
Switching tube S6 colelctor electrode and the connection of diode D2 positive pole, tie point as d points,
The negative pole connection of diode D1 negative pole and diode D2,
Tie point a points and the connection of tie point d points,
Tie point b points and the connection of tie point c points,
Switching tube S3, S4 tie point are connected with diode D1, D2 tie point,
DC support electric capacity CDCPositive pole and switching tube S1 colelctor electrode connection, negative pole and switching tube S5 emitter stage connection.
2. New single-phase photovoltaic inversion drain current suppressing topological structure as claimed in claim 1, it is characterised in that：Described switching tube S1, S2, S3, S4, S5, S6 are IGBT or MOSFET.
3. New single-phase photovoltaic inversion drain current suppressing topological structure as claimed in claim 1, it is characterised in that：Tie point b points and output inductor LaConnection, tie point d points and output inductor LbConnection.
4. New single-phase photovoltaic inversion drain current suppressing topological structure as claimed in claim 3, it is characterised in that：The output inductor La、LbIt is symmetrical and size is identical.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208643A (en) * | 2016-08-03 | 2016-12-07 | 西安电子科技大学 | Based on the common mode current suppressing method under the non-equal illumination of photovoltaic combining inverter |
| CN108471244A (en) * | 2018-06-14 | 2018-08-31 | 珠海格力电器股份有限公司 | A kind of frequency-changeable compressor reduces the compensation circuit and its control method of leakage current |
| CN111865132A (en) * | 2020-08-26 | 2020-10-30 | 阳光电源（上海）有限公司 | Single-phase inverter, inverter topology circuit and control method thereof |
-
2015
- 2015-07-28 CN CN201520553932.9U patent/CN204859029U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106208643A (en) * | 2016-08-03 | 2016-12-07 | 西安电子科技大学 | Based on the common mode current suppressing method under the non-equal illumination of photovoltaic combining inverter |
| CN108471244A (en) * | 2018-06-14 | 2018-08-31 | 珠海格力电器股份有限公司 | A kind of frequency-changeable compressor reduces the compensation circuit and its control method of leakage current |
| CN111865132A (en) * | 2020-08-26 | 2020-10-30 | 阳光电源（上海）有限公司 | Single-phase inverter, inverter topology circuit and control method thereof |
| CN111865132B (en) * | 2020-08-26 | 2024-02-09 | 阳光电源（上海）有限公司 | Single-phase inverter, inverter topology circuit and control method thereof |
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