CN203747686U - Single-phase mixed three-level grid-connected inverter - Google Patents

Single-phase mixed three-level grid-connected inverter Download PDF

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Publication number
CN203747686U
CN203747686U CN201420071879.4U CN201420071879U CN203747686U CN 203747686 U CN203747686 U CN 203747686U CN 201420071879 U CN201420071879 U CN 201420071879U CN 203747686 U CN203747686 U CN 203747686U
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CN
China
Prior art keywords
switching tube
diode
emitter
collector electrode
inductance
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Expired - Fee Related
Application number
CN201420071879.4U
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Chinese (zh)
Inventor
张海波
王杰
孙邦伍
王兆明
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NANJING GUANYA POWER EQUIPMENT CO Ltd
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NANJING GUANYA POWER EQUIPMENT CO Ltd
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Priority to CN201420071879.4U priority Critical patent/CN203747686U/en
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0095—Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck

Abstract

The utility model discloses a single-phase mixed three-level grid-connected inverter comprising an input direct-current source portion (1), a neutral-point balancing circuit (2), an alternating-current inverter portion (3), and an output filter circuit. On an occasion with high requirement of the leakage current, the turning on and off of the auxiliary tube of the alternating-current inverter portion is controlled to realize common-mode leakage current suppression; and on an occasion with high requirement of the output waveform quality, controlling of turning on and off of the auxiliary tube of the alternating-current inverter portion and a third bridge arm is carried out, thereby reducing the output waveform harmonic component and realizing the neutral-point balancing of the inverter direct-current side. The provided single-phase grid-connected inverter can be applied to different occasions; the switching tube loss is uniform; the wide power factor adjustment and neutral-point level drift suppression under different modulation strategies can be realized.

Description

A kind of single-phase mixing three level grid-connected inverters
Technical field
The utility model relates to a kind of power electronic device field, especially a kind of single-phase mixing three level grid-connected inverters.
Background technology
In recent years, three level translations have become direct current to the research and application focus of AC inverter, mainly because of relative two level of three level translations, have voltage withstand class high, and output waveform harmonic content is little, the high feature of efficiency.Diode-clamped three level topological structures are simple in structure because of it, and technology maturation advantage, is used widely.In middle low power occasion, non-isolation type combining inverter is little because having volume without transformer, and cost is low, the high advantage of efficiency, but there is Leaked Current of Line to Ground flow problem.For non-isolation single-phase grid-connected inverter leakage problem, improved topological structure has been proposed, typically there is H5 topology, band dc bypass full-bridge topology, band alternating current bypass topology.Patent CN101599713 discloses a kind of method of single-phase grid-connected inverter leakage current, although can effectively suppress common mode current, but its inverter bridge output waveform Uab is still identical with single-phase full-bridge inverter output waveform, output waveform quality, not as traditional mixing three level grid-connected inverters, does not make full use of the advantage of three level topological structures.For the neutral balance of three-level converter, control and be divided into hardware and software scheme, although software approach suppresses to have saved cost, but algorithm is complicated, inhibition is affected by power factor and modulation strategy, increase the scheme of ancillary hardware, although there is no advantage on cost, control simple, meritorious idle adjustable, and not affected by modulation system.Patent CN102104333 discloses a kind of neutral balance circuit of half-bridge three-level, effectively suppresses the skew of midpoint potential, patent CN102739100 disclose a kind of based on ' the neutral balance circuit of the half-bridge three-level of T ' font, reduced by two diodes.But all there is the hidden danger of bridge arm direct pass in above-mentioned two kinds of topological structures, patent US2011/0013438 discloses a kind of follow-on single-phase semi-bridge three-level converter topology, overcome three traditional level bridge arm direct pass problems, so the present invention is applied to this topological structure in the neutral balance of single-phase mixing three level grid-connected inverters.
Summary of the invention
For problems of the prior art, the utility model provides a kind of single-phase mixing three level grid-connected inverters.
Technical solution of the present utility model is: a kind of single-phase mixing three level grid-connected inverters, comprise 2, one ac converter parts 3 of 1, one neutral balance circuit of an input direct-current source part and output filter circuit.
Described input direct-current source part comprises: the first electrochemical capacitor C d1, the second electrochemical capacitor C d2rear and input direct-current source U connect dcin parallel.
Described neutral balance circuit comprises: the first switching tube S 01, second switch pipe S 02press that emitter is connected with collector electrode and be connected with the 3rd diode D3 negative electrode, the 5th diode D5 negative electrode and the first switching tube S 01collector electrode is connected and is connected to power supply U dcpositive pole, the 3rd switching tube S 03, the 4th switching tube S 04press that emitter is connected with collector electrode and be connected with the 4th diode D4 anode, the 6th diode D6 anode one end and the 4th switching tube S 04emitter is connected and is connected to power supply U dcnegative pole, the 5th diode D5 anode is connected with second inductance L 2 one end, the 6th diode D6 negative electrode is connected with first inductance L 1 one end, and the first inductance L 1, second inductance L 2 one end are connected and are connected to mid point N with the 3rd diode D3 anode, the 4th diode D4 negative electrode after being connected.
Described ac converter partly comprises: the first switching tube S1, second switch pipe S2, the 3rd switching tube S3, the 4th switching tube S4 presses respectively emitter and is connected with collector electrode, the first diode D1 negative electrode with the emitter of the IGBT-S5 of anti-phase diode, be not connected after be connected to the emitter of the first switching tube S1, the second diode D2 anode with the collector electrode of the IGBT-S6 of anti-phase diode, be not connected after be connected to the collector electrode of the 4th switching tube S4, the first diode D1 anode is connected to mid point N after being connected with the second diode D2 negative electrode, the collector electrode of the 5th switching tube S5 is connected with the emitter of the 6th switching tube S6 and is connected to the emitter of the 7th switching tube S7, the 7th switching tube S7 emitter is connected with the collector electrode of the 8th switching tube S8, the first switching tube S1, the 7th switching tube S7 collector electrode is connected to power supply U after being connected dcpositive pole, the 4th switching tube S4, the 8th switching tube S8 emitter are connected to power supply U after being connected dcnegative pole.
Described output filter circuit comprises: the first filter inductance L f1two ends are connected with the first inverter bridge output terminals A respectively and filter capacitor C fone end is connected, the second filter inductance L f2two ends are connected with the second inverter bridge output B respectively and filter capacitor C fthe other end is connected, filter capacitor C ftwo ends and electrical network U gbe connected.
The beneficial effects of the utility model are: single-phase mixing three level grid-connected inverters of the present utility model, can adapt to different occasions, and switching tube loss is even, realizes wide power factor regulation, and the midpoint potential drift under different modulating strategy suppresses.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present invention.
Fig. 2 is the oscillogram that the present invention suppresses the switching tube of inverter bridge under leakage current.
Fig. 3 is S in neutral balance circuit 01, S 02conductive current path schematic diagram.
Fig. 4 is S in neutral balance circuit 01, S 02cut-off current path schematic diagram.
Fig. 5 is S in neutral balance circuit 03, S 04conductive current path schematic diagram.
Fig. 6 is S in neutral balance circuit 03, S 04cut-off current path schematic diagram.
Fig. 7 is S in neutral balance circuit 02, S 03conductive current path schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, by specific embodiment, technical solutions of the utility model are described further.
As shown in Figure 1 and Figure 2, Fig. 1 is circuit diagram of the present invention; Fig. 2 is the oscillogram that the present invention suppresses the switching tube of inverter bridge under leakage current.
Single-phase mixing three level grid-connected inverters of the present embodiment, comprise 2, one ac converter parts 3 of 1, one neutral balance circuit of an input direct-current source part and output filter circuit.
Ac converter partly comprises: the first switching tube S1, second switch pipe S2, the 3rd switching tube S3, the 4th switching tube S4 presses respectively emitter and is connected with collector electrode, the first diode D1 negative electrode with the emitter of the IGBT-S5 of anti-phase diode, be not connected after be connected to the emitter of the first switching tube S1, the second diode D2 anode with the collector electrode of the IGBT-S6 of anti-phase diode, be not connected after be connected to the collector electrode of the 4th switching tube S4, the first diode D1 anode is connected to mid point N after being connected with the second diode D2 negative electrode, the collector electrode of the 5th switching tube S5 is connected with the emitter of the 6th switching tube S6 and is connected to the emitter of the 7th switching tube S7, the 7th switching tube S7 emitter is connected with the collector electrode of the 8th switching tube S8, the first switching tube S1, the 7th switching tube S7 collector electrode is connected to power supply U after being connected dcpositive pole, the 4th switching tube S4, the 8th switching tube S8 emitter are connected to power supply U after being connected dcnegative pole,
Output comprises: the first filter inductance L f1two ends are connected with the first inverter bridge output terminals A respectively and filter capacitor C fone end is connected, the second filter inductance L f2two ends are connected with the second inverter bridge output B respectively and filter capacitor C fthe other end is connected, filter capacitor C ftwo ends and electrical network U gbe connected.
When leakage current requirement high field is closed, auxiliary IGBT pipe the 5th switching tube S5 of ac converter part, the 6th switching tube S6 is closed, adopt the control mode of SPWM, the first switching tube S1 ~ eight switching tube S8 oscillogram as shown in Figure 2, the 3rd switching tube S3 in line voltage positive half period with the first switching tube S1, the complementary conducting of the 8th switching tube S8, second switch pipe S2 in line voltage negative half-cycle with the 4th switching tube S4, the complementary conducting of the 7th switching tube S7.Now output common mode voltage keeps U dc/ 2 is constant, has the common mode of inhibition leakage current characteristic.
As shown in Figure 3, Figure 4, Figure 5, Figure 6, Figure 7, Fig. 3 is S in neutral balance circuit 01, S 02conductive current path schematic diagram; Fig. 4 is S in neutral balance circuit 01, S 02cut-off current path schematic diagram; Fig. 5 is S in neutral balance circuit 03, S 04conductive current path schematic diagram; Fig. 6 is S in neutral balance circuit 03, S 04cut-off current path schematic diagram; Fig. 7 is S in neutral balance circuit 02, S 03conductive current path schematic diagram.
Neutral balance circuit comprises: the first switching tube S 01, second switch pipe S 02press that emitter is connected with collector electrode and be connected with the 3rd diode D3 negative electrode, the 5th diode D5 negative electrode and the first switching tube S 01collector electrode is connected and is connected to power supply U dcpositive pole, the 3rd switching tube S 03, the 4th switching tube S 04press that emitter is connected with collector electrode and be connected with the 4th diode D4 anode, the 6th diode D6 anode one end and the 4th switching tube S 04emitter is connected and is connected to power supply U dcnegative pole, the 5th diode D5 anode is connected with second inductance L 2 one end, the 6th diode D6 negative electrode is connected with first inductance L 1 one end, and the first inductance L 1, second inductance L 2 one end are connected and are connected to mid point N with the 3rd diode D3 anode, the 4th diode D4 negative electrode after being connected;
When output waveform quality requirement high field is closed, auxiliary IGBT pipe the 5th switching tube S5 of ac converter part, the 6th switching tube S6 disconnects, and inverter bridge can adopt SPWM modulation system or SVPWM modulation system, by being independent of inverter bridge neutral balance circuit, realize the balance of midpoint potential.As the second electrochemical capacitor C d2voltage is less than the first electrochemical capacitor C d1voltage, reaches while setting threshold pressure differential the first switching tube S 01, second switch pipe S 02conducting, through the first inductance L 1, forms Boost circuit, DC power supply U dcto the second electrochemical capacitor C d2charging, makes the second electrochemical capacitor C d2current potential rises; The first switching tube S 01, second switch pipe S 02turn-off, the first inductance L 1 passes to the second electrochemical capacitor C by the 6th diode D6 by dump energy d2, make the second electrochemical capacitor C d2current potential rises, because DC source U dcvoltage is constant, thereby makes the first electrochemical capacitor C d1voltage drop.Same principle, controls the 3rd switching tube S 03, the 4th switching tube S 04, through the second inductance L 2, can be to the first electrochemical capacitor C d1charging; When mid-point voltage is within the scope of permissible variation, control second switch pipe S 02, the 3rd switching tube S 03conducting, on the not impact of normal inverter circuit.
The foregoing is only the present invention's preferred embodiment; not with this, limit practical range of the present invention, all persons that is familiar with technique, use principle of the present invention and technical characterictic; various changes and the decoration done, within all should being covered by the protection category that these claims define.

Claims (3)

1. single-phase mixing three level grid-connected inverters, is characterized in that: comprise an input direct-current source part (1), a neutral balance circuit (2), ac converter part (3) and an output filter circuit;
Described input direct-current source part comprises: the first electrochemical capacitor (C d1), the second electrochemical capacitor (C d2) rear and input direct-current source (U connect dc) parallel connection;
Described neutral balance circuit comprises: the first switching tube (S 01), second switch pipe (S 02) press that emitter is connected with collector electrode and be connected with the 3rd diode (D3) negative electrode, the 5th diode (D5) negative electrode and the first switching tube (S 01) collector electrode is connected and is connected to power supply (U dc) positive pole, the 3rd switching tube (S 03), the 4th switching tube (S 04) press that emitter is connected with collector electrode and be connected with the 4th diode (D4) anode, the 6th diode (D6) anode one end and the 4th switching tube (S 04) emitter is connected and is connected to power supply (U dc) negative pole, the 5th diode (D5) anode is connected with the second inductance (L2) one end, the 6th diode (D6) negative electrode is connected with the first inductance (L1) one end, and the first inductance (L1), the second inductance (L2) one end are connected and are connected to mid point (N) with the 3rd diode (D3) anode, the 4th diode (D4) negative electrode after being connected.
2. single-phase mixing three level grid-connected inverters according to claim 1, it is characterized in that: described ac converter partly comprises: the first switching tube (S1), second switch pipe (S2), the 3rd switching tube (S3), the 4th switching tube (S4) is pressed respectively emitter and is connected with collector electrode, the first diode (D1) negative electrode with not with the IGBT(S5 of anti-phase the 5th diode) emitter be connected to the emitter of the first switching tube (S1) after being connected, the second diode (D2) anode with not with the IGBT(S6 of anti-phase the 6th diode) collector electrode be connected to the collector electrode of the 4th switching tube (S4) after being connected, the first diode (D1) anode is connected to mid point (N) after being connected with the second diode (D2) negative electrode, the collector electrode of the 5th switching tube (S5) is connected with the emitter of the 6th switching tube (S6) and is connected to the emitter of the 7th switching tube (S7), the 7th switching tube (S7) emitter is connected with the collector electrode of the 8th switching tube (S8), the first switching tube (S1), the 7th switching tube (S7) collector electrode is connected to power supply (U after being connected dc) positive pole, the 4th switching tube (S4), the 8th switching tube (S8) emitter are connected to power supply (U after being connected dc) negative pole.
3. single-phase mixing three level grid-connected inverters according to claim 1, is characterized in that: described output filter circuit comprises: the first filter inductance (L f1) two ends are connected and filter capacitor (C with the first inverter bridge output (A) respectively f) one end is connected, the second filter inductance (L f2) two ends are connected and filter capacitor (C with the second inverter bridge output (B) respectively f) other end is connected, filter capacitor (C f) two ends and electrical network (U g) be connected.
CN201420071879.4U 2014-02-20 2014-02-20 Single-phase mixed three-level grid-connected inverter Expired - Fee Related CN203747686U (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106374596A (en) * 2016-09-13 2017-02-01 华北电力大学（保定） Non-isolation type three-phase three-level V2G charge-discharge topological structure and control method therefor
CN107707126A (en) * 2017-11-14 2018-02-16 山东奥太电气有限公司 A kind of three Level Full Bridge Sofe Switch convertor circuits and its control method
CN107733271A (en) * 2017-11-14 2018-02-23 山东奥太电气有限公司 A kind of circuit structure and method for realizing three-level inverter circuit neutral-point potential balance
CN110086371A (en) * 2019-06-18 2019-08-02 阳光电源股份有限公司 Inverter system and its DC bus ripple compensation method
CN110212573A (en) * 2019-05-27 2019-09-06 东南大学 Power factor zero-adjustable current type non-isolated grid-connected inverter and switch control time sequence thereof
CN110800203A (en) * 2017-07-14 2020-02-14 华为技术有限公司 Hybrid resonant converter
CN112787530A (en) * 2021-01-11 2021-05-11 上海电气富士电机电气技术有限公司 Three-level inverter with bus midpoint voltage compensation and control method thereof
CN107733271B (en) * 2017-11-14 2024-04-30 山东奥太电气有限公司 Circuit structure and method for realizing neutral point potential balance of three-level inverter circuit

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106374596A (en) * 2016-09-13 2017-02-01 华北电力大学（保定） Non-isolation type three-phase three-level V2G charge-discharge topological structure and control method therefor
CN110800203A (en) * 2017-07-14 2020-02-14 华为技术有限公司 Hybrid resonant converter
CN107707126A (en) * 2017-11-14 2018-02-16 山东奥太电气有限公司 A kind of three Level Full Bridge Sofe Switch convertor circuits and its control method
CN107733271A (en) * 2017-11-14 2018-02-23 山东奥太电气有限公司 A kind of circuit structure and method for realizing three-level inverter circuit neutral-point potential balance
CN107733271B (en) * 2017-11-14 2024-04-30 山东奥太电气有限公司 Circuit structure and method for realizing neutral point potential balance of three-level inverter circuit
CN110212573A (en) * 2019-05-27 2019-09-06 东南大学 Power factor zero-adjustable current type non-isolated grid-connected inverter and switch control time sequence thereof
CN110212573B (en) * 2019-05-27 2022-05-13 东南大学 Power factor zero-adjustable current type non-isolated grid-connected inverter and switch control time sequence thereof
CN110086371A (en) * 2019-06-18 2019-08-02 阳光电源股份有限公司 Inverter system and its DC bus ripple compensation method
CN110086371B (en) * 2019-06-18 2020-07-07 阳光电源股份有限公司 Inverter system and direct current bus ripple compensation method thereof
CN112787530A (en) * 2021-01-11 2021-05-11 上海电气富士电机电气技术有限公司 Three-level inverter with bus midpoint voltage compensation and control method thereof
CN112787530B (en) * 2021-01-11 2023-04-07 上海电气富士电机电气技术有限公司 Three-level inverter with bus midpoint voltage compensation and control method thereof

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