CN103178734A - Photovoltaic inverter - Google Patents
Photovoltaic inverter Download PDFInfo
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- CN103178734A CN103178734A CN2013100743692A CN201310074369A CN103178734A CN 103178734 A CN103178734 A CN 103178734A CN 2013100743692 A CN2013100743692 A CN 2013100743692A CN 201310074369 A CN201310074369 A CN 201310074369A CN 103178734 A CN103178734 A CN 103178734A
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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 invention discloses a photovoltaic inverter which comprises four switch circuits, two follow current circuits, two filter inductors, and a storage capacitor. Each follow current circuit is composed of a follow current switch device and a follow current diode in serial connection, wherein the follow current diode is a backward diode. The switch circuits are controlled by high-frequency PWM (pulse width modulation) signals, the follow current circuits are controlled by low-frequency signals identical with output of the inverter in frequency, and the storage capacitor is bridged at an input port of a full-bridge topological circuit. The photovoltaic inverter has the advantages that low power consumption, lower ripper waves, low cost, high efficiency, high reliability and the like.
Description
Technical field
The present invention relates to a kind of inverter that direct current energy is converted to AC energy, the direct current energy that is specifically related to a kind of solar cell with photovoltaic array is converted to the inverter of the AC energy that is incorporated into the power networks with civil power, belongs to AC/DC (DC/AC) device for converting electric energy.
Background technology
Existing photovoltaic combining inverter mainly contains:
1) isolation type grid-connected inverter, mainly by using isolating transformer that DC side and AC are carried out electric insulation, although this inverter does not exist on the safety that common mode current (leakage current) etc. brings and the problem of EMC etc., cost is high, and transformation of electrical energy efficient is low.
2) non-isolated grid-connected inverter improves transformation of electrical energy efficient by omitting isolating transformer.But because DC side and AC do not have electric insulation, and have parasitic capacitance between photovoltaic array and ground, can produce common mode current, this has just increased electromagnetic radiation and potential safety hazard.Should manage to suppress the common mode current in non-isolated photovoltaic grid-connected inverter for this reason.Be below the little main several non-isolated grid-connected inverter of common mode current:
A. bipolarity full bridge inverter
Its circuit as shown in Figure 1, this bipolarity full bridge inverter, although circuit structure is simple, common mode current (leakage current) is little, and four switch S 1～S4 in circuit are all the time in HF switch, switching loss is large, and output current ripple is large, has increased the loss on ac filter inductance L 1, L2, has in addition the energy exchange between filter inductance L1, L2 and storage capacitor C, parasitic factor in inductance and capacitor element causes extra power loss, so overall conversion efficiency is extremely low.
The B.H5 bridge inverter
Its circuit as shown in Figure 2, in this inverter, increase an extra switching device S5 and diode D5 by the DC side at the bipolarity full bridge inverter, make continuous current circuit when afterflow and DC side disconnects, thereby make this topology not only suppress common mode current, and there is no the problem of the energy exchange between filter inductance L1, L2 and storage capacitor C.Output voltage is unipolarity, and current ripples is little, has reduced the loss of L1, L2 on the ac filter inductance.
Shortcoming: during energy output, the positive-negative half-cycle of electric current output all need by 3 device S5, S1, S4 or S5, S3, S2, increase the conduction loss of device like this.In addition, the bridgc arm short that the switching device fault causes may occur, and this short circuit approach can produce very large short circuit current in the extremely short time without any impedance, the danger that causes that circuit damages is arranged.
Summary of the invention
Technical problem to be solved by this invention is: for the shortcoming and defect of prior art, the photovoltaic DC-to-AC converter of a kind of high efficiency, high reliability is provided, solved the energy exchange problem between filter inductance and storage capacitor, reduce conduction loss, reduce the danger of bridgc arm short by increasing backward diode, improved the reliability of circuit.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of photovoltaic DC-to-AC converter, comprise four switching circuits, two filter inductances, a storage capacitor, two freewheeling circuits, wherein the first switching circuit is connected with described photovoltaic DC-to-AC converter input anode respectively with the input of the 3rd switching circuit, and the second switch circuit is connected with described photovoltaic DC-to-AC converter input cathode respectively with the output of the 4th switching circuit; Be connected the first freewheeling circuit between the first switching circuit and second switch circuit, the input of the input of the first freewheeling circuit and second switch circuit is connected to form node E, and the output of the output of the first freewheeling circuit and the first switching circuit is connected to form node C; Be connected the second freewheeling circuit between the 3rd switching circuit and the 4th switching circuit, the input of the input of the second freewheeling circuit and the 4th switching circuit is connected to form node F, and the output of the second freewheeling circuit and the 3rd switching circuit output are connected to form node D; The end of the first filter inductance L1 is connected with node C, and the other end is connected with the end of node F, supported V ac; The second filter inductance L2 one end is connected with node D, and the other end is connected with the other end of node E, supported V ac; Described storage capacitor is connected across between the both positive and negative polarity of photovoltaic DC-to-AC converter input; Described four switching circuits are controlled by high-frequency signal, and freewheeling circuit is controlled by low frequency signal, and wherein high-frequency signal is pwm signal, and low frequency signal is to export the signal of same frequency with inverter.
Described freewheeling circuit is connected in series by continued flow switch device and fly-wheel diode, and wherein fly-wheel diode is backward diode.
Compared with prior art, the present invention has following beneficial effect:
1, apparatus of the present invention continuous current circuit when afterflow and DC side disconnect, suppressed common mode current, and there is no the problem of the energy exchange between filter inductance and storage capacitor, prevented that the parasitic factor in inductance and capacitor element from causing extra loss;
2, output voltage is unipolarity, and current ripples is little, has reduced the loss on the ac filter inductance.
3, only have two switching devices to carry out simultaneously HF switch, reduced switching loss;
When 4, energy is exported, electric current only flows through two devices, has reduced conduction loss;
5, increase reverse diode in brachium pontis, when switching device breaks down, be not easy to occur bridgc arm short, strengthened the reliability of circuit.
Description of drawings
Fig. 1 is the bipolarity full bridge inverter figure of prior art.
Fig. 2 is the H5 bridge inverter circuit diagram of prior art.
Fig. 3 is inverter circuit diagram of the present invention.
Fig. 4 is the positive half cycle schematic diagram of inverter output current of the present invention.
Fig. 5 is the positive half cycle afterflow of inverter output current of the present invention schematic diagram.
Fig. 6 is inverter output current negative half period schematic diagram of the present invention.
Fig. 7 is inverter output current negative half period afterflow schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, structure of the present invention and the course of work are described further.
As shown in Figure 1, the bipolarity full bridge inverter comprises a full-bridge topology circuit, two filter inductances, storage capacitor, DC power supply, load, the full-bridge topology circuit is comprised of four switching circuits, wherein, four switching circuits are connected in parallel by switching device S1 and diode D1 respectively, switching device S2 and diode D2 are connected in parallel, and switching device S3 and diode D3 are connected in parallel, and switching device S4 and diode D4 are connected in parallel; Switching device S1 and switching device S2 are connected to form node A, and switching device S3 and switching device S4 are connected to form node B, are connected in series successively filter inductance L1, AC supported V ac and filter inductance L2 between node A, B; DC power supply Vin is in parallel with storage capacitor C to be connected across between the input port 1,2 of full-bridge topology circuit.
H5 bridge inverter circuit as shown in Figure 2, increases a switching device S5 and sustained diode 5 in the DC side of circuit shown in Figure 1, and switching device S5 and sustained diode 5 are connected in parallel, and makes continuous current circuit when afterflow and the DC side disconnection.
The present invention improves on the basis of circuit shown in Figure 2, two freewheeling circuits have been increased, as shown in Figure 3, freewheeling circuit is comprised of continued flow switch device S5, S6 and sustained diode 5, D6, switching device S5 and sustained diode 5 are composed in series the first freewheeling circuit, switching device S6 and sustained diode 6 are composed in series the second freewheeling circuit, the first freewheeling circuit is serially connected between switching device S1 and switching device S2, form respectively node C, D the second freewheeling circuit is serially connected between switching device S3 and switching device S4, forms respectively node E, F; Filter inductance L1 is connected across between node C, F, and filter inductance L2 is connected across between node D, E, series filtering inductance L 1, AC supported V ac and filter inductance L2 successively between node C, D; Switching device S1, S2, S3, S4 are subjected to the high-frequency PWM signal controlling, continued flow switch device S5, S6 is subjected to exchange output same frequency low frequency signal control.
Suppose that electric current is the positive half cycle of output current from node A outflow, electric current flows out from node B point and is the negative half period of output current.
. at the positive half cycle of output current, as shown in Figure 4, switching device S3, S4, afterflow device S6 remain shutoff, and afterflow device S5 remains conducting.When switching device S1, S2 conducting, electric current flows out from DC power supply Vin, get back to DC power supply Vin by switching device S1, node C, filter inductance L1, AC supported V ac, node E, switching device S2 successively and form the closed-loop path, the positive half cycle of output current is exported from AC supported V ac.When switching device S1, S2 turn-offed, as shown in Figure 5, electric current was through continued flow switch S5, and sustained diode 5, node C, node E are that AC supported V ac carries out afterflow.
Claims (3)
1. photovoltaic DC-to-AC converter, it is characterized in that: comprise four switching circuits, two filter inductances, a storage capacitor, two freewheeling circuits, wherein the first switching circuit is connected with described photovoltaic DC-to-AC converter input anode respectively with the input of the 3rd switching circuit, form node (1), the second switch circuit is connected with described photovoltaic DC-to-AC converter input cathode respectively with the output of the 4th switching circuit, forms node (2); Be connected the first freewheeling circuit between the first switching circuit and second switch circuit, the input of the input of the first freewheeling circuit and second switch circuit is connected to form node E, and the output of the output of the first freewheeling circuit and the first switching circuit is connected to form node C; Be connected the second freewheeling circuit between the 3rd switching circuit and the 4th switching circuit, the input of the input of the second freewheeling circuit and the 4th switching circuit is connected to form node F, and the output of the second freewheeling circuit and the 3rd switching circuit output are connected to form node D; The end of the first filter inductance L1 is connected with node C, and the other end is connected with node F, supported V ac one end; The second filter inductance L2 one end is connected with node D, and the other end is connected with node E, the supported V ac other end; Described storage capacitor is connected across between the both positive and negative polarity of photovoltaic DC-to-AC converter input; Described four switching circuits are controlled by high-frequency signal, and freewheeling circuit is controlled by low frequency signal.
2. a kind of photovoltaic DC-to-AC converter according to claim 1, it is characterized in that: described freewheeling circuit is connected in series by continued flow switch device and fly-wheel diode, and wherein fly-wheel diode is backward diode.
3. a kind of photovoltaic DC-to-AC converter according to claim 1, it is characterized in that: described high-frequency signal is pwm signal, low frequency signal is the signal with inverter output same frequency.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100743692A CN103178734A (en) | 2013-03-08 | 2013-03-08 | Photovoltaic inverter |
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| CN2013100743692A CN103178734A (en) | 2013-03-08 | 2013-03-08 | Photovoltaic inverter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119513A (en) * | 2015-08-27 | 2015-12-02 | 无锡伊佩克科技有限公司 | Control method for optically-coupled isolation vehicle power supply photovoltaic inverter |
| CN105141160A (en) * | 2015-08-24 | 2015-12-09 | 苏州市博得立电源科技有限公司 | Vehicle-mounted power supply photovoltaic inverter |
| CN105162342A (en) * | 2015-08-27 | 2015-12-16 | 无锡伊佩克科技有限公司 | Optical-coupling isolating vehicle power supply photovoltaic inverter |
| CN105262091A (en) * | 2015-08-24 | 2016-01-20 | 苏州市博得立电源科技有限公司 | Control method for vehicle-mounted power supply photovoltaic inverter |
| CN105471296A (en) * | 2015-11-27 | 2016-04-06 | 深圳市美克能源科技股份有限公司 | Inverter circuit |
| CN109327155A (en) * | 2017-07-31 | 2019-02-12 | 比亚迪股份有限公司 | DC voltage turns inverter, method and the inverter of alternating voltage |
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| CN102088193A (en) * | 2011-03-04 | 2011-06-08 | 东南大学 | Photovoltaic synchronization grid full bridge six-switching tube inverter and control method thereof |
| CN201994871U (en) * | 2011-03-04 | 2011-09-28 | 东南大学 | Photovoltaic grid six-switch tube bridge inverter |
| CN102291029A (en) * | 2011-08-19 | 2011-12-21 | 阳光电源股份有限公司 | Inverter |
| CN202231632U (en) * | 2011-09-14 | 2012-05-23 | 梁雪芹 | Single-phase non-isolated form low common mode current photovoltaic grid connected inverter |
| CN102664544A (en) * | 2012-04-28 | 2012-09-12 | 陕西长岭光伏电气有限公司 | Two-pole single-phase photovoltaic inverter and inversion method thereof |
| CN202535290U (en) * | 2012-04-05 | 2012-11-14 | 苏州风云电源有限公司 | Photovoltaic inverter circuit |
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2013
- 2013-03-08 CN CN2013100743692A patent/CN103178734A/en active Pending
Patent Citations (7)
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| EP0704957B1 (en) * | 1994-09-30 | 1999-01-07 | Fronius Schweissmaschinen Kg Austria | Current source for power supply of a consumer circuit |
| CN102088193A (en) * | 2011-03-04 | 2011-06-08 | 东南大学 | Photovoltaic synchronization grid full bridge six-switching tube inverter and control method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105141160A (en) * | 2015-08-24 | 2015-12-09 | 苏州市博得立电源科技有限公司 | Vehicle-mounted power supply photovoltaic inverter |
| CN105262091A (en) * | 2015-08-24 | 2016-01-20 | 苏州市博得立电源科技有限公司 | Control method for vehicle-mounted power supply photovoltaic inverter |
| CN105119513A (en) * | 2015-08-27 | 2015-12-02 | 无锡伊佩克科技有限公司 | Control method for optically-coupled isolation vehicle power supply photovoltaic inverter |
| CN105162342A (en) * | 2015-08-27 | 2015-12-16 | 无锡伊佩克科技有限公司 | Optical-coupling isolating vehicle power supply photovoltaic inverter |
| WO2017031880A1 (en) * | 2015-08-27 | 2017-03-02 | 无锡伊佩克科技有限公司 | Method for controlling optically-coupled isolation vehicle-mounted power supply photovoltaic inverter |
| CN105471296A (en) * | 2015-11-27 | 2016-04-06 | 深圳市美克能源科技股份有限公司 | Inverter circuit |
| CN105471296B (en) * | 2015-11-27 | 2019-01-11 | 深圳市美克能源科技股份有限公司 | Inverter circuit |
| CN109327155A (en) * | 2017-07-31 | 2019-02-12 | 比亚迪股份有限公司 | DC voltage turns inverter, method and the inverter of alternating voltage |
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Application publication date: 20130626 |