CN207218562U - A kind of low-leakage current grid-connected inverter circuit - Google Patents
A kind of low-leakage current grid-connected inverter circuit Download PDFInfo
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- CN207218562U CN207218562U CN201721207495.0U CN201721207495U CN207218562U CN 207218562 U CN207218562 U CN 207218562U CN 201721207495 U CN201721207495 U CN 201721207495U CN 207218562 U CN207218562 U CN 207218562U
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Abstract
The utility model discloses a kind of low-leakage current grid-connected inverter circuit.The utility model adds two switching tubes and the full-bridge being made up of four diodes on the basis of single-phase full bridge topology.One end of two switching tubes is connected with the DC voltage side midpoint of single-phase full bridge inverter circuit, and the full-bridge that the other end forms with diode connects, and the other end of the full-bridge of diode composition is electrically connected by two and network interface inductance with single phase power supply power network.Therefore reversals freewheeling period common-mode voltage and the power output stage common-mode voltage be to maintain it is constant, i.e. relative to the earth for be constant voltage source, because constant pressure will not produce electric current for electric capacity and then inhibit common mode current, that is, reduce leakage current.
Description
Technical field
It the utility model is related to electrical engineering field, and in particular to a kind of power electronic equipment answering in electrical engineering
With being a kind of low-leakage current grid-connected inverter circuit.
Background technology
Inverter is a kind of device that direct current energy is converted into AC energy.Pass through the control to switching tube in inverter
It can realize that dc source is converted into civilian alternating current 220V power supply, the different AC power of frequency can also be converted into control
Motor speed etc..As new energy technology development ground is constantly ripe, electric energy caused by solar energy etc. is incorporated to large-scale supply network
As a kind of method for improving power supply reliability.Realize that the grid-connected main equipment of electric energy is exactly inverter.Inverter is in electric energy
The process of conversion needs the break-make of the high frequency of high-power switch tube to realize, and the HF switch of power device can produce high frequency and be total to
Mode voltage, it is well known that the photovoltaic array that photovoltaic generation is made up of large batch of photovoltaic plate serioparallel more, larger pair be present
Ground parasitic capacitance, so as to generate common mode current i.e. leakage current in the presence of high frequency common mode voltage.High-frequency leakage current makes photovoltaic
The conduction of electricity generation system and radiation interference become serious, add harmonic wave and the system loss of grid-connected current, can also be led when serious
Personal safety is caused to be on the hazard.It is to solve non-isolation type photovoltaic inverter grid-connected technology to suppress the leakage current in photovoltaic generating system
One of key issue.The most common process for suppressing leakage current is the topological structure for the inverter circuit for changing inverter, and construction is new
Continuous current circuit.Make output end and the grid side decoupling of photovoltaic cell in the freewheeling period in inverter switching device cycle, prevent common mode
The formation in loop, wherein most representational topological structure is H5, H6 and Heric topological structure.These topological structures are all logical
The quantity of increase switching device is crossed to change the transmission path of continuous current circuit, and then suppresses the purpose of leakage current.H5 topologys
It is that its shortcoming is to have to flow through increased switching tube in grid-connected stage current, is caused by increasing a switching tube on H4 bridges
The conduction loss increase of switching tube, but H5 bridges are minimum compared to the increased number of switches of other topological structures, and control mode is simple,
Cost is relatively low.The research and improvement of H6 bridge topological structures are more, by increasing by two switching tubes, form continuous current circuit, make photovoltaic
Remained disengaged between cell panel and power network.H6 topographical forms are changeable, but need the order of opening of switch tube to optimize, with
Reach efficiency optimization, further improve efficiency and then limited by MOSFET and IGBT performance.Application No.
201610246182.X a kind of single-phase non-isolated photovoltaic grid-connected inverter and its control method be exactly a kind of H6 topological structures
Inverter circuit.
Therefore design it is a kind of reduce leakage current topological structure apply in inverter turn into one kind urgently require.
The content of the invention
The technical problems to be solved in the utility model is：A kind of low-leakage current grid-connected inverter circuit is provided, is had effective
Suppress the function of leakage current.
The technical scheme of the technical problems to be solved in the utility model is：A kind of low-leakage current grid-connected inverter circuit, including
Dc source, first and second derided capacitors, first, second, third and fourth, five, six switching tubes, first, second, third and fourth diode, first,
Two grid-connected inductance, first, second, third and fourth, five, six fly-wheel diodes and controller.After the first and second derided capacitors series connection
It is attempted by the both positive and negative polarity of dc source.The colelctor electrode of first and third switching tube simultaneously connects electric with the positive pole of dc source afterwards
Connection, the emitter stage of second, four switching tubes simultaneously connects to be electrically connected with the negative pole of dc source afterwards, the emitter stage of first switch pipe and
The colelctor electrode electrical connection of second switch pipe, the colelctor electrode electrical connection of the emitter stage and the 4th switching tube of the 3rd switching tube.The
The first grid-connected inductance, the emitter stage of the 3rd switching tube are in series between the emitter stage of one switching tube and the live wire of single phase power supply power network
The second grid-connected inductance is in series between the zero line of single phase power supply power network.The negative pole of first and third diode and after connecing and the
The colelctor electrode electrical connection of five switching tubes, the tie point electrical connection of the emitter stage and first and second derided capacitors of the 5th switching tube.
Described second, the positive pole of four diodes and rear and the 6th switching tube emitter stage electrical connection, the colelctor electrode of the 6th switching tube are connect
It is electrically connected with the tie point of first and second derided capacitors.The negative pole of the positive pole of first diode and the second diode connection after and
The emitter stage electrical connection of first switch pipe, switched after the negative pole connection of the positive pole and the 4th diode of the 3rd diode with the 3rd
The emitter stage electrical connection of pipe.First, second, third and fourthth, five, six fly-wheel diodes switch with first, second, third and fourth, five, six respectively
Pipe opposite polarity simultaneously connects.Described first, second, third and fourth, five, the gate pole of six switching tubes and controller electrical connection, to control out
Close the turn-on and turn-off of pipe.
Preferably, the dc source is solar panel array.
Preferably, the controller uses single-chip microcomputer as microcontroller chip.
Preferably, described first, second, third and fourth, five, six switching tubes use IGBT module.
The beneficial effects of the utility model are：
1st, the utility model increases by two switching tubes and one by diode group on the basis of single-phase full bridge inverter circuit
Into full-bridge, there is circuit structure is simple, cost is low beneficial effect；
2nd, voltage of the utility model at the freewheeling period bridge arm midpoint that power output is zero remains at dc source
The half of output voltage, common-mode voltage is set to tend to constant, therefore with the beneficial effect for substantially reducing leakage current；
3rd, the utility model has the simple beneficial effect of switch controlled method.
Brief description of the drawings
Fig. 1 is circuit structure diagram of the present utility model,
Fig. 2 is the equivalent circuit diagram of the utility model caused parasitic capacitance over the ground in actual moving process,
Fig. 3 is a kind of non-isolation type single-phase full bridge grid-connected inverter circuit structure in the prior art,
Fig. 4 is a kind of Commonmode model electricity of simplification of non-isolation type single-phase full bridge grid-connected inverter circuit structure in the prior art
Road,
Fig. 5 is the timing diagram of the utility model driving control signal,
Fig. 6 (a) is the current flow diagrams of utility model works state 1,
Fig. 6 (b) is the current flow diagrams of utility model works state 2,
Fig. 6 (c) is the current flow diagrams of utility model works state 3,
Fig. 6 (d) is the current flow diagrams of utility model works state 4.
Embodiment
To make the technical solution of the utility model and beneficial effect clearer, below to embodiment of the present utility model
Further explained in detail.
As shown in figure 1, a kind of low-leakage current grid-connected inverter circuit, including dc source and by diode, switching tube, electricity
The controller of appearance, the major loop of inductance composition and controlling switch pipe turn-on and turn-off.
The utility model is improved on the basis of single-phase full bridge inverter circuit, therefore the agent structure of circuit is more simple
It is single.In order to keep the stabilization of voltage, in parallel first and second derided capacitors C1, the C2 being cascaded in the both ends of dc source,
Preferably, dc source herein is the direct current that photovoltaic generation is sent.
The positive pole electrical connection of first switch pipe S1 colelctor electrode and dc source, first switch pipe S1 emitter stages and second
Switching tube S2 colelctor electrode electrical connection, the negative pole electrical connection of second switch pipe S2 emitter stage and dc source.3rd opens
Close the current collection of the positive pole electrical connection of pipe S3 colelctor electrode and dc source, the 3rd switching tube S3 emitter stages and the 4th switching tube S4
Pole is electrically connected, the negative pole electrical connection of the 4th switching tube S4 emitter stage and dc source.
It is in series with the first grid-connected inductance L1 between first switch pipe S1 emitter stage and the live wire of single phase power supply power network, the 3rd
The second grid-connected inductance L2 is in series between switching tube S3 emitter stage and the zero line of single phase power supply power network.
First and third diode D1, D3 negative electrode simultaneously connects the colelctor electrode electrical connection with the 5th switching tube S5 afterwards, the 5th switch
Pipe S5 emitter stage and first and second derided capacitors C1, C2 tie point are electrically connected.Secondth, four diode D2, D4 anode
And connect and be electrically connected afterwards with the 6th switching tube S6 emitter stage, the 6th switching tube S6 colelctor electrode and first and second derided capacitors C1,
C2 tie point electrical connection.
First diode D1 anode, the second diode D2 negative electrode and first switch pipe S1 emitter stage are electrically connected.
The emitter stage electrical connection of 3rd diode D3 anodes, the 4th diode D4 negative electrode and the 3rd switching tube S3.
Because the inverter circuit is the improvement that is carried out on the basis of single-phase full bridge inverter circuit, therefore remain original
Fly-wheel diode, i.e. each switching tube simultaneously connect a diode, and the wherein positive pole of diode connects with the emitter stage of switching tube,
The negative pole of diode connects with the colelctor electrode of switching tube.Therefore first, second, third and fourth, five, six afterflows two are additionally provided with the circuit
Pole pipe DX1, DX2, DX3, DX4, DX5, DX6 respectively to first, second, third and fourth, five, six switching tube S1, S2, S3, S4,
S5, S6 simultaneously connect.
In the actual moving process of photovoltaic electric station grid connection, parasitic capacitance Cpv over the ground and grounded inductor Lg be present, its is equivalent
Circuit is as shown in Fig. 2 parasitic capacitance Cpv and grounded inductor Lg is connected on the negative pole of dc source and big over the ground in equivalent circuit
Between ground, and the tie point for defining the parasitic capacitance Cpv negative pole with dc source over the ground is n points.The zero of single phase power supply power network
Line end and the earth are electrically connected.Wherein over the ground parasitic capacitance Cpv and grounded inductor Lg be due in running inverter circuit in n
The change caused inductance capacitance and inductive sensor relative to the earth of the voltage of point.
In order to realize the control of the turn-on and turn-off to six switching tubes, the gate pole and controller of switching tube are electrically connected,
The related peripheral circuit of controller is realizing the normal operation of controller.
Fig. 3 is a kind of topological structure of non-isolation type single-phase full bridge grid-connected inverter circuit, and Fig. 4 is being total to for the simplification of the structure
Mould model.Parasitic capacitance and the tie point of grid-connected inverter circuit topological structure are n points over the ground defined in figure, and wherein Ucm_ab is common
Mode voltage, Udm_ab are differential mode voltage, and Utcm is the total common-mode voltage of system in formula.From circuit diagram,
The total common-mode voltage of system is：
As shown in formula (3), as La ≠ Lb, Udm_ab can directly affect the total common-mode voltage Utcm of system size.But one
As in the case of, grid-connected inductance La and Lb values are identical, then formula (3) is with regard to abbreviation：
Shown in the calculation formula of common mode current such as formula (5),
When Utcm value is constant, Utcm can regard a constant-voltage source as, be understood according to formula (5), system common-mode electric current
It is zero.It can be inferred that common mode current can be eliminated when the voltage value stabilization of common-mode voltage is constant, that is, eliminate leakage current.
The utility model can eliminate leakage current significantly according to circuit structure and control method.Above is electricity of the present utility model
Line structure and the principle for eliminating leakage current, the control method of this low-leakage current grid-connected inverter circuit is described below.
Realize that output end produces by switched conductive first, fourth switching tube S1, S4 and second and third switching tube S2, S3 to exchange
Power supply is simplest control mode.There are other different control modes certainly for the topological structure of different inverter circuits
Such as PWM control modes, SPWM control modes, these prior arts are no longer described in detail here.
Electric current is called alternating current with time cyclically-varying, and positive half period is generally divided into a cycle of alternating current and is born
Half period.In order to realize that direct current becomes exchange, it is necessary to export positive electricity in positive half period, output negative electricity in negative half-cycle.Such as Fig. 5
Shown, its control mode is：
In positive half period, controller turns on driving first, fourth switching tube S1, S4 high frequency, second and third switching tube S2,
S3 is turned off all the time, during this period, the five, the six switching tube S5, S6 drive signal and first, fourth switching tube S1, S4 driving letter
Number complementation.Specially：
When first, fourth switching tube S1, S4 is turned on, the five, the six switching tube S5, S6 shut-offs, are now power delivery phase, electricity
The flow direction of stream is that grid-connected inductance L1 → single phase power supply power network → the second of positive pole → first switch pipe S1 → the first of dc source is simultaneously
The negative pole of the switching tube S4 of net inductance L2 → the 4th → dc source；
When first, fourth switching tube S1, S4 is turned off, the five, the six switching tube S5, S6 conductings, are now freewheeling period, electric current
Flow to and be, the switching tube of the switching tube S5 of the diode D3 of the grid-connected inductance L2 of single phase power supply power network → the second → the 3rd → the 5th → the 6th
The grid-connected inductance L1 → single phase power supply power network of diode D2 → the first of S6 → second.
In negative half-cycle, controller drives second and third switching tube S2, S3 high frequency to turn on, first, fourth switching tube S1, S4
All the time turn off, during this period, the five, the six switching tube S5, S6 drive signal and second and third switching tube S2, S3 drive signal
It is complementary.Specially：
When second and third switching tube S2, S3 are turned on, the five, the six switching tube S5, S6 shut-offs, are now power delivery phase, electricity
The flow direction of stream is, grid-connected inductance L2 → single phase power supply power network → the first of switching tube S3 → the second of the positive pole of dc source → the 3rd is simultaneously
The negative pole of net inductance L1 → second switch pipe S2 → dc source；
When second and third switching tube S2, S3 are turned off, the five, the six switching tube S5, S6 conductings, are now freewheeling period, electric current
Flow to and be, the switching tube of the switching tube S5 of the diode D1 of the grid-connected inductance L1 of single phase power supply power network → the first → first → the 5th → the 6th
The grid-connected inductance L2 → single phase power supply power network of diode D4 → the second of S6 → the 4th.
The control mode produces following four working condition in a cycle：
Define in Fig. 6 that the tie point of parasitic capacitance Cpv and grid-connected inverter circuit is n points over the ground first.
Working condition 1, positive voltage, power output stage are exported in positive half period.In the working condition, first, fourth
Switching tube S1, S4 are turned on, second and third, five, six switching tube S2, S3, S5, S6 close, now dc source is to single phase power supply power network
Transmission power.The flow direction of electric current is the grid-connected inductance L1 → single phase power supply of positive pole → first switch pipe S1 → the first of dc source
The negative pole of the switching tube S4 of the grid-connected inductance L2 of power network → the second → the 4th → dc source.As knowable to Fig. 6 (a), Uan=Upv, Ubn
=0, understood according to formula (4), common-mode voltage 0.5Upv.
Working condition 2, no-voltage, freewheeling period are exported in positive half period.In the working condition, first, second and third,
Four switching tube S1, S2, S3, S4 turn off, the five, the six switching tube S5, S6 conducting, now the five, the six switching tube S5, S6 and second,
Three diode D2, D3 provide loop for grid-connected inductive current, and grid-connected inductive current direction is identical with working condition 1.The stream of electric current
The switching tube S6 of the switching tube S5 of the diode D3 of Xiang Wei, the grid-connected inductance L2 of single phase power supply power network → the second → the 3rd → the 5th → the 6th →
The grid-connected inductance L1 → single phase power supply power network of second diode D2 → the first.As shown in Fig. 6 (b), because the five, the six switching tubes connect
It is first and second derided capacitors C1, C2 midpoint to two derided capacitors of DC link, bridge arm mid-point voltage is photovoltaic output voltage
Upv half, i.e. Uan=Ubn=0.5Upv.Therefore understand that common-mode voltage is 0.5Upv by formula (4).
Working condition 3, the interior output negative voltage of negative half-cycle, power output stage.In the working condition, second and third switch
Pipe S2, S3 are turned on, the shut-off of first, fourth, five, six switching tube S1, S4, S5, S6 switching tubes, and DC current source is electric to single phase power supply
Net transmission power.The flow direction of electric current is, the grid-connected inductance L2 of switching tube S3 → the second of the positive pole of dc source → the 3rd → single-phase confession
The negative pole of the grid-connected inductance L1 of power network → the first → second switch pipe S2 → dc source.As knowable to Fig. 6 (c), Uan=0, Ubn
=Upv, Uab=-Upv, understood according to formula (4), common-mode voltage 0.5Upv.
Working condition 4, the interior output no-voltage of negative half-cycle, freewheeling period.In the working condition, first, second, third and fourth opens
Pipe S1, S2, S3, S4 shut-off are closed, the five, the six switching tube S5, S6 are turned on, and inductive current direction is identical with working condition 3.Electric current
Flow to and be, the switching tube S6 of the switching tube S5 of the diode D1 of the grid-connected inductance L1 of single phase power supply power network → the first → first → the 5th → the 6th
Shown in the grid-connected inductance L2 of → the four diode D4 → the second → single phase power supply power network such as Fig. 6 (d), Uan=Ubn=0.5Upv, because
This is from formula (4), common-mode voltage 0.5Upv.
Understand that in four working conditions the value of common-mode voltage maintains 0.5Upv all the time, according to formula (5) by analysis
Understand, when common-mode voltage is constant, common mode current is zero.Therefore it can show that the inverter circuit has effectively drop from theory analysis
The beneficial effect of low-leakage current.
For the correctness of proof theory, the utility model and heric inverter circuits are opened up by MATLAB/Simulink
Flutter the contrast that structure carries out simulation analysis and data.Wherein input voltage Upv=350V, first and second derided capacitors C1, C2 distinguish
For 250uF, first and second grid-connected inductance L1, L2 is 1.8mH, and parasitic capacitance Cpv values are 100uF over the ground.Grounded inductor Lg
Numerical value is very small to have carried out ignoring calculating herein.The leakage current that heric inversion topological structures are found by emulation is about 0.15A,
Although leakage current of the present utility model is not completely eliminated but amplitude is smaller, about 0.04A.It is described above, it is sufficient to prove this
Utility model can greatly reduce leakage current, realize the target of efficient energy-saving.
In summary, preferred embodiment only of the present utility model, not it is used for limiting the scope of the utility model,
By above-mentioned description, relevant staff completely can in the range of without departing from this item utility model technological thought,
Carry out various changes and amendments.Technical scope of the present utility model is not limited to the content on specification, Fan Yiben
Shape, construction, feature and the so-called equivalent changes and modifications of spirit described in the claimed range of utility model, all should include and this
In the right of utility model.
Claims (4)
- A kind of 1. low-leakage current grid-connected inverter circuit, it is characterised in that：Including dc source, first and second derided capacitors (C1, C2), first, second, third and fourth, five, six switching tubes (S1, S2, S3, S4, S5, S6), first, second, third and fourth diode (D1, D2, D3, D4), first and second grid-connected inductance (L1, L2), first, second and third, 4th, five, six fly-wheel diodes (DX1, DX2, DX3, DX4, DX5, DX6) and controller,It is attempted by after first and second derided capacitors (the C1, C2) series connection on the both positive and negative polarity of dc source,The colelctor electrode of first and third switching tube (S1, S3) simultaneously connects the positive pole electrical connection with dc source afterwards, and second, four open The emitter stage for closing pipe (S2, S4) simultaneously connects and is electrically connected afterwards with the negative pole of dc source, the emitter stage of first switch pipe (S1) and the The colelctor electrode electrical connection of two switching tubes (S2), the emitter stage of the 3rd switching tube (S3) and the colelctor electrode electricity of the 4th switching tube (S4) Gas connects,It is in series with the first grid-connected inductance (L1) between the emitter stage of first switch pipe (S1) and the live wire of single phase power supply power network, the 3rd The second grid-connected inductance (L2) is in series between the emitter stage of switching tube (S3) and the zero line of single phase power supply power network,The negative pole of first and third diode (D1, D3) simultaneously connects rear and the 5th switching tube (S5) colelctor electrode electrical connection, and the 5th The tie point electrical connection of the emitter stage and first and second derided capacitors (C1, C2) of switching tube (S5),Described second, the positive pole of four diodes (D2, D4) and it is electrically connected with the emitter stage of the 6th switching tube (S6) after connecing, the 6th The tie point electrical connection of the colelctor electrode and first and second derided capacitors (C1, C2) of switching tube (S6),Emitter stage after the negative pole connection of the positive pole and the second diode (D2) of first diode (D1) with first switch pipe (S1) Electrical connection, the hair after the negative pole connection of the positive pole and the 4th diode (D4) of the 3rd diode (D3) with the 3rd switching tube (S3) Emitter-base bandgap grading is electrically connected,First, second, third and fourthth, five, six fly-wheel diodes (DX1, DX2, DX3, DX4, DX5, DX6) respectively with first, second and third, 4th, five, six switching tube (S1, S2, S3, S4, S5, S6) opposite polarities and connect,Described first, second, third and fourth, five, the gate pole of six switching tubes (S1, S2, S3, S4, S5, S6) and controller electrical connection, are used With the turn-on and turn-off of controlling switch pipe.
- A kind of 2. low-leakage current grid-connected inverter circuit according to claim 1, it is characterised in that：The dc source is solar panel array.
- A kind of 3. low-leakage current grid-connected inverter circuit according to claim 1, it is characterised in that：The controller is using single-chip microcomputer as microcontroller chip.
- A kind of 4. low-leakage current grid-connected inverter circuit according to claim 1, it is characterised in that：Described first, second, third and fourth, five, six switching tubes (S1, S2, S3, S4, S5, S6) use IGBT module.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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