CN105186914A - Novel H6 single-phase non-isolation grid-connected inverter - Google Patents
Novel H6 single-phase non-isolation grid-connected inverter Download PDFInfo
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- CN105186914A CN105186914A CN201510501153.9A CN201510501153A CN105186914A CN 105186914 A CN105186914 A CN 105186914A CN 201510501153 A CN201510501153 A CN 201510501153A CN 105186914 A CN105186914 A CN 105186914A
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Abstract
The invention relates to a novel H6 single-phase non-isolation grid-connected inverter. The novel H6 single-phase non-isolation grid-connected inverter comprises six switch tubes, a filtering module and a modulation circuit module. The filtering module is connected with the source electrode of a switch tube S5 and an AC side, and the modulation circuit module is used for generating six driving signals so as to respectively control conduction and disconnection of the six switch tubes. The novel H6 single-phase non-isolation grid-connected inverter brought forward by the invention can eliminate high-frequency pulsation of common-mode voltages, can effectively inhibit leakage currents, changes the freewheeling current path, enables freewheeling currents to pass only through the switch tubes yet not through a body diode with quite large conduction loss, reduces the conduction loss and completely eliminates reverse recovery loss of the diode. At the same time, the structure provided by the invention applies a quite small number of devices, is low in common-mode voltages, good in grid-connection work stability and high in grid-connection waveform quality and can effectively improve the efficiency.
Description
Technical field
The present invention relates to electric and electronic power conversion field, particularly relate to the single-phase non-isolated combining inverter of a kind of novel H6.
Technical background
In recent years, due to the support of national policy, combining inverter obtains significant progress, from Miniature inverter to single-phase low-power inverter again to high-power inverter three-phase, and the various New Topologicals derived.The generating efficiency of performance to whole system of topological structure plays a key effect, and greatly affects reliability and the production cost of whole system use.It is the core objective studying New Topological that the basis ensureing low-leakage current is raised the efficiency.Isolated form with output transformer is one of modal structure in combining inverter, is also use maximum combining inverters in the market.This transformer completes voltage matches and isolation features simultaneously.Buffer action due to transformer: on the one hand, can protect personal safety, and on the other hand, the system of ensure that can not inject DC component to electrical network, effectively prevents the saturated of distribution transformer.But transformer adds the volume of whole system, weight and cost.The advantage that non-isolation type combining inverter is high with its efficiency, volume is little, cost is low, occupies main flow in distributed photovoltaic power generation system.But non-isolation type combining inverter because do not have isolating transformer, thus brings leakage problem.Leakage current is in the nature common mode current, and this parasitic capacitance can form common mode resonance circuit with inverter output filtering element and electric network impedance, can cause the change of voltage in parasitic capacitance and common-mode voltage Ucm during the power switch action of inverter, the common-mode voltage of change can encourage this resonant circuit thus produce common mode current Icm.The appearance of common mode current, can increase the conduction loss of system, reduces Electro Magnetic Compatibility and produces safety problem.And Ground leakage current also can cause the saturated of alternating current filter too greatly, reduce filter effect, also may cause the damage of combining inverter simultaneously.For ensureing safety, the common mode current of VDE0126-1-1 standard to grid-connected system makes strict regulations.For suppressing the leakage current of non-isolation type combining inverter, common-mode voltage Ucm should be made as far as possible to change and to reduce.If can ensure that common-mode voltage Ucm is a constant, then can eliminate common mode current Icm in principle.
Traditional H4 type inverter can not suppress leakage current under unipolarity modulation system, under bipolar modulation mode, although effectively leakage current can be suppressed, under but all switching devices are all operated in high frequency state, add switching loss, and the ripple current amplitude that during bipolar modulation, its inversion exports is larger.In order to improve the performance such as efficiency, reliability, power supply quality of combining inverter, all kinds of topological structure is in succession proposed and is widely used, and wherein most is representational H5 and H6 topology.Five switches (H5) the type topology of SMA company of Germany invention, effectively can solve leakage problem, its peak efficiency reaches 98.1%.The H6 type topology that pertinent literature proposes, effectively can suppress leakage current, diode adopts fast recovery type diode, significantly reduce diode reverse recovery losses, but freewheeling period electric current still flows through diode, conduction loss is still comparatively large, especially when big current.
Summary of the invention
In order to solve the problems of the technologies described above, the single-phase non-isolated combining inverter of a kind of novel H6 that the present invention proposes effectively can improve the efficiency of inverter on the basis of reducing number of diodes and raising common mode current rejection ability, and concrete technical scheme is as follows:
The single-phase non-isolated combining inverter of a kind of novel H6, is made up of six switching tube S1-S6, filtration module and modulation circuit modules;
Wherein, the drain electrode of switching tube S1 is connected with the drain electrode of switching tube S2 and is connected to DC side anode, the source electrode of switching tube S1 is connected with the source electrode of S2 and is connected with the drain electrode of switching tube S5, the drain electrode of switching tube S6 respectively, the source electrode of switching tube S5 is connected with the source electrode of S6 and is connected with the drain electrode of switching tube S3, the drain electrode of switching tube S4 respectively, and the source electrode of switching tube S3 is connected with the source electrode of switching tube S4 and is connected to positive DC side end;
Described filtration module mainly comprises two inductance L 1 and L2, the source electrode of described inductance L 1 one end connecting valve pipe S5, and one end connects AC; The drain electrode of described inductance L 2 one end connecting valve pipe S4, one end connects AC;
Described modulation circuit module is dsp controller, and the grid of switching tube S1, S4 receives the drive singal output drawn by sinusoidal wave and triangle wave; The grid of switching tube S2, S3 receives the drive singal output drawn by the sine wave of phase 180 ° and above-mentioned same triangle wave; It is 1 that switching tube S5 grid is received at the positive half cycle of AC, the drive singal output that negative half period is obtained through inverse by switching tube S2, S3 drive singal; The grid of switching tube S6 is received and is obtained through inverse by switching tube S1, S4 drive singal at the positive half cycle of AC, and negative half period perseverance is the drive singal output of 1;
There are four kinds of operation modes in inverter of the present invention in each sinusoidal cycles:
Operation mode 1: during the positive half cycle of AC voltage, switching tube S5 mono-leads directly to, and S2, S3 normal off drives S1, S4 HF switch with identical drive signals.During S1, S4 conducting, grid-connected current forms loop to mains supply through S1, S5, filter inductance L1, electrical network, filter inductance L2, S4.Brachium pontis output voltage is U
aB=+U
dC.
Operation mode 2:S1, S4 turn off, and S2, S3 normal off, S5 conducting, S6 HF switch, when S6 conducting, grid-connected current forms continuous current circuit through S5, filter inductance L1, electrical network, filter inductance L2, S6, and now electrical network and DC side depart from.Brachium pontis output voltage is U
aB=0.
Operation mode 3: during AC voltage negative half cycle, switching tube S6 conducting always, S1, S4 normal off, drives S2, S3 HF switch with identical signal.During S2, S3 conducting, input current forms loop power to grid side through S2, S6, filter inductance L2, electrical network, filter inductance L1, S3.Brachium pontis output voltage is U
aB=-U
dC.
Operation mode 4:S1, S4 turn off, and S2, S3 turn off, and S6 conducting always, S5 HF switch, when S5 conducting, electric current forms continuous current circuit through S5, S6, filter inductance L2, electrical network, filter inductance L1, and now electrical network and DC side depart from.Brachium pontis output voltage U
aB=0.
The positive half cycle of AC voltage, in operation mode 1, S1, S5 conducting, brachium pontis exports A point to the voltage U of DC bus negative terminal N
aN=U
dC, S4 conducting, brachium pontis exports B point to the voltage U of DC bus negative terminal N
bN=0, so
In operation mode 2, S1, S3 turn off, and now utilize S1, S3 switching tube junction capacitance of shutoff to realize all pressing, brachium pontis exports A point to the voltage U of DC bus negative terminal N
aN=0.5U
dC, S2, S4 turn off, and now utilize S2, S4 switching tube junction capacitance of shutoff to realize all pressing, brachium pontis exports B point to DC bus negative terminal N voltage U
bN=0.5U
dC, so common-mode voltage is
Analysis and the positive half cycle of AC voltage negative half cycle are similar, no longer describe in detail.There is above-mentioned analysis can obtain common-mode voltage U
cm=0.5U
dC, keep constant, leakage current I can be obtained accordingly
cm=0.Principle meets the design principle suppressing leakage current.
Further, described switching tube S1-S6 adopts N channel enhancement MOSFET, and this is for the consideration to closedown or conduction device required voltage.
Further, drain electrode and the source electrode of described switching tube S1-S6 are all connected a fly-wheel diode, the source electrode of described switching tube connects the positive pole of diode, the drain electrode of described switching tube connects the negative pole of diode, described fly-wheel diode is for improving switching speed, maintain afterflow, reverse breakdown when preventing powered-down.
This New Topological of the present invention can eliminate the dither of common-mode voltage, effectively suppresses leakage current.Simultaneously, modulation circuit module of the present invention proposes the control strategy that the single-phase non-isolated combining inverter of novel H6 with this adapts, change freewheel current path, make freewheel current only through insulating gate type field effect tube, without the body diode that conduction loss is larger, reduce conduction loss, completely eliminate the reverse recovery loss of diode, be conducive to raising the efficiency.
Accompanying drawing explanation
Fig. 1, primary structure schematic diagram of the present invention
Fig. 2, traditional H5 type topology schematic diagram
The H6 type topology schematic diagram of Fig. 3, band diode
Fig. 4, modulation circuit module drive singal of the present invention
Four kinds of operation modes of the present invention in Fig. 5, a sinusoidal cycles
Fig. 6, major experimental waveform of the present invention, wherein
A () is S1, S4 and S2, the driving voltage waveform of S3,
B driving voltage waveform that () is S5, S6,
C () is brachium pontis output terminals A, B is to the voltage U of DC bus negative terminal
aN, U
bNand 2 times of common-mode voltage Ucm waveforms,
D () is output voltage and current waveform in semi-load situations
E () is output voltage and current waveform in 1500W situation
F () is output voltage under full load conditions and current waveform
Embodiment
Below in conjunction with specific embodiment, the present invention is described further.
Embodiment 1,
Adopt topological structure of the present invention to develop the combining inverter of a 2000W, be made up of six switching tube S1-S6, filtration module and modulation circuit modules; Described switching tube all adopts COOLMOSIPW60R041C6, and adopt DSP28335 to be modulation circuit module control chip in the present embodiment, switching frequency is 20KHz.Output inductor L1, L2 select 1mH, and described alternating voltage outlet side is also connected with the filter capacitor of a 4.7uF.DC voltage U
dCfor 300V, line voltage is 220V, and output frequency is 50Hz, and power output is 2000W.
As shown in Figure 1, the drain electrode of metal-oxide-semiconductor S1 is connected with the drain electrode of metal-oxide-semiconductor S2 and is connected to DC side anode, the source electrode of metal-oxide-semiconductor S1 is connected with the source electrode of S2 and is connected with the drain electrode of metal-oxide-semiconductor S5, the drain electrode of metal-oxide-semiconductor S6 respectively, the source electrode of metal-oxide-semiconductor S5 is connected with the source electrode of S6 and is connected with the drain electrode of metal-oxide-semiconductor S3, the drain electrode of metal-oxide-semiconductor S4 respectively, and the source electrode of metal-oxide-semiconductor S3 is connected with the source electrode of metal-oxide-semiconductor S4 and is connected to positive DC side end; Described inductance L 1 one end connects the source electrode of metal-oxide-semiconductor S5, and one end connects AC; Described inductance L 2 one end connects the drain electrode of metal-oxide-semiconductor S4, and one end connects AC;
The grid of metal-oxide-semiconductor S1, S4 receives the drive singal output drawn by sinusoidal wave and triangle wave; The grid of metal-oxide-semiconductor S2, S3 receives the drive singal output drawn by the sine wave of phase 180 ° and above-mentioned same triangle wave; It is 1 that metal-oxide-semiconductor S5 grid is received at the positive half cycle of AC, the drive singal output that negative half period is obtained through inverse by metal-oxide-semiconductor S2, S3 drive singal; The grid of metal-oxide-semiconductor S6 is received and is obtained through inverse by metal-oxide-semiconductor S1, S4 drive singal at the positive half cycle of AC, and negative half period perseverance is the drive singal output of 1; As shown in Figure 4, the specific experiment waveform in the present embodiment is as shown in Fig. 6 (a) He Fig. 6 (b) for described drive signal waveform.
The experimental result of the present embodiment is as shown in Fig. 6 (c)-(f), and in figure, 2Ucm waveform is by pressure U
aNand U
bNsummation operation obtains, and is substantially tending towards constant as can be seen, so the suppression leakage current ability of this topology is fine, meets design principle.The radio-frequency component of 2 times of Ucm waveforms at line voltage zero passage place is caused by low-frequency tube drive singal dead band.D (), (e), (f) sets forth this topology output voltage U under different capacity level condition
oand electric current I
owaveform, as can be seen from the figure under this topological different capacity grade, output voltage current waveform is all high-quality waveform.
With above-mentioned foundation desirable embodiment of the present invention for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this invention technological thought, can carry out various change and amendment completely.The technical scope of this invention is not limited to the content on specification, must determine its technical scope according to right.
Claims (3)
1. the single-phase non-isolated combining inverter of novel H6, is characterized in that: be made up of six switching tube S1-S6, filtration module and modulation circuit modules;
Wherein, the drain electrode of switching tube S1 is connected with the drain electrode of switching tube S2 and is connected to DC side anode, the source electrode of switching tube S1 is connected with the source electrode of S2 and is connected with the drain electrode of switching tube S5, the drain electrode of switching tube S6 respectively, the source electrode of switching tube S5 is connected with the source electrode of S6 and is connected with the drain electrode of switching tube S3, the drain electrode of switching tube S4 respectively, and the source electrode of switching tube S3 is connected with the source electrode of switching tube S4 and is connected to positive DC side end;
Described filtration module mainly comprises two inductance L 1 and L2, the source electrode of described inductance L 1 one end connecting valve pipe S5, and one end connects AC; The drain electrode of described inductance L 2 one end connecting valve pipe S4, one end connects AC;
Described modulation circuit module is dsp controller, and the grid of switching tube S1, S4 receives the drive singal output drawn by sinusoidal wave and triangle wave; The grid of switching tube S2, S3 receives the drive singal output drawn by the sine wave of phase 180 ° and above-mentioned same triangle wave; It is 1 that switching tube S5 grid is received at the positive half cycle of AC, the drive singal output that negative half period is obtained through inverse by switching tube S2, S3 drive singal; The grid of switching tube S6 is received and is obtained through inverse by switching tube S1, S4 drive singal at the positive half cycle of AC, and negative half period perseverance is the drive singal output of 1.
2. the single-phase non-isolated combining inverter of a kind of novel H6 as claimed in claim 1, is characterized in that: described switching tube S1-S6 adopts N channel enhancement MOSFET.
3. the single-phase non-isolated combining inverter of a kind of novel H6 as claimed in claim 1, it is characterized in that: drain electrode and the source electrode of described switching tube S1-S6 are all connected a fly-wheel diode, the source electrode of described switching tube connects the positive pole of diode, and the drain electrode of described switching tube connects the negative pole of diode.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107070280A (en) * | 2017-01-12 | 2017-08-18 | 珠海格力电器股份有限公司 | Combining inverter and inversion system |
| CN109120178A (en) * | 2018-09-30 | 2019-01-01 | 华南理工大学 | A kind of novel single-phase non-isolated MOSFET gird-connected inverter |
| CN116169677A (en) * | 2023-02-17 | 2023-05-26 | 三峡大学 | Parallel active filter based on grouping U-shaped unit inverter and control method |
| CN116667692A (en) * | 2023-08-02 | 2023-08-29 | 国网江苏省电力有限公司电力科学研究院 | Zero-current conversion full-bridge non-isolated inverter circuit without switching loss |
| CN116683787A (en) * | 2023-08-02 | 2023-09-01 | 国网江苏省电力有限公司电力科学研究院 | Soft switching non-isolated grid-connected inverter circuit capable of running with zero switching loss |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107070280A (en) * | 2017-01-12 | 2017-08-18 | 珠海格力电器股份有限公司 | Combining inverter and inversion system |
| CN109120178A (en) * | 2018-09-30 | 2019-01-01 | 华南理工大学 | A kind of novel single-phase non-isolated MOSFET gird-connected inverter |
| CN116169677A (en) * | 2023-02-17 | 2023-05-26 | 三峡大学 | Parallel active filter based on grouping U-shaped unit inverter and control method |
| CN116667692A (en) * | 2023-08-02 | 2023-08-29 | 国网江苏省电力有限公司电力科学研究院 | Zero-current conversion full-bridge non-isolated inverter circuit without switching loss |
| CN116683787A (en) * | 2023-08-02 | 2023-09-01 | 国网江苏省电力有限公司电力科学研究院 | Soft switching non-isolated grid-connected inverter circuit capable of running with zero switching loss |
| CN116683787B (en) * | 2023-08-02 | 2023-10-03 | 国网江苏省电力有限公司电力科学研究院 | Soft switching non-isolated grid-connected inverter circuit capable of running with zero switching loss |
| CN116667692B (en) * | 2023-08-02 | 2023-10-03 | 国网江苏省电力有限公司电力科学研究院 | Zero-current conversion full-bridge non-isolated inverter circuit without switching loss |
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