CN104753384A - Improved zero-current converting H6 structural non-isolation photovoltaic grid-connected inverter and control method thereof - Google Patents

Improved zero-current converting H6 structural non-isolation photovoltaic grid-connected inverter and control method thereof Download PDF

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CN104753384A
CN104753384A CN201510123088.0A CN201510123088A CN104753384A CN 104753384 A CN104753384 A CN 104753384A CN 201510123088 A CN201510123088 A CN 201510123088A CN 104753384 A CN104753384 A CN 104753384A
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resonant
current
inductance
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auxiliary switch
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CN104753384B (en
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廖志凌
熊颖杰
崔清华
施卫东
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Jiangsu University
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    • 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
    • H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02J3/383—
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses an improved zero-current converting H6 structural non-isolation photovoltaic grid-connected inverter and a control method thereof, and belongs to the field of electric power and electronics. The inverter is that a resonance inductor L7r and a resonance capacitor C7r are connected in series with a source electrode of an auxiliary switch tube S7r and then are connected in parallel with a main switching tube S7 according to the original zero-current converting H6 structural non-isolation photovoltaic grid-connected inverter; a resonance inductor L8r and a resonance capacitor C8r are connected in series with the source electrode of an auxiliary switch tube S8r and then are connected in parallel with the main switch tube S8; an anode of a diode D is connected with the source electrode of an MOSFET tube, and while a cathode of the diode D is connected with a drain electrode of the MOSFET; the auxiliary switches S7r and S8r are moved from AB and CD branches to be connected with the LC; the current of the auxiliary switch tubes can be automatically reduced to be zero through the LC unit in the inverter continuous flowing stage, thus the zero current on and off of the main and auxiliary switch tubes can be achieved; meanwhile, the modulating strategy is changed; the parameters of a filter is adjusted; the leakage electricity is reduced; the quality of electricity energy entering a power grid is improved; the working efficiency of the circuit can be increased.

Description

A kind of modified model zero-current switching H6 structure non-isolated grid-connected inverter and control method thereof
Technical field
The invention belongs to parallel network power generation technology electric and electronic technical field, be specifically related to a kind of improvement based on zero-current switching H6 structure non-isolated grid-connected inverter and method of work.
Background technology
Non-isolated photovoltaic grid-connected inverter uses widely in distributed photovoltaic power generation is emerging, efficiently can not only change solar energy into electric energy, and its portable construction, method simply can also promote the development of power industry energetically.Existing two kinds are reduced leakage current ways respectively: method one, improve drain current suppressing performance based on most high conversion efficiency circuit structure.The method suppresses leakage current by improving circuit topology knot, modulation strategy etc.; Method two, improves circuit transformations efficiency based on optimum drain current suppressing circuit structure.Device loss mainly comprises conduction loss and switching loss, but switching device more and more high frequency makes switching loss greatly increase and then affect circuit efficiency, and the use of Sofe Switch can reduce switching loss to a certain extent, mainly eliminate device loss in switching process by introducing resonant process before and after opening at switch.In all dissimilar circuit of Sofe Switch zero-current switching pwm circuit because of the excessive shortcoming of soft switch circuit current stress before overcoming gradually studied person applied.Paper can not realize the zero-current switching of auxiliary switch for a kind of zero-current switching H6 structure non-isolated photovoltaic grid-connected inverter that second method proposes and grid current exists the shortcoming of certain harmonic wave, propose new topological structure and control method on its basis to reduce the zero-current switching that leakage current realizes auxiliary switch, common-mode voltage can be made to be a definite value by the free clamper of continuous current circuit during freewheeling period simultaneously.
Summary of the invention
For the deficiency of original zero-current switching H6 structure non-isolated grid-connected inverter, the present invention proposes a kind of topological structure and control method of novel zero-current switching H6 structure non-isolated grid-connected inverter.
Technical scheme of the present invention is: a kind of modified model zero-current switching H6 structure non-isolated grid-connected inverter, comprises 2 main switch S with anti-paralleled diode 7, S 8, 2 auxiliary switch S not with anti-paralleled diode 7r, S 8r, 2 resonant inductance L 7r, L 8r, 2 resonant capacitance C 7r, C 8r, 2 DC bus capacitor C 1, C 2, 2 freewheeling period clamp diode D 5, D 6, full bridge inverter switch T 1-T 4;
Described main switch S 7, resonant inductance L 7r, resonant capacitance C 7r, auxiliary switch S 7rbe in series successively, described main switch S 8, resonant inductance L 8r, resonant capacitance C 8r, auxiliary switch S 8rbe in series successively, DC bus capacitor C 1positive pole A hold and auxiliary switch S 7rdrain electrode B hold connect, DC bus capacitor C 2negative pole C hold and auxiliary switch S 8rsource electrode D hold connect, B end with D end between be provided with diode D, freewheeling period clamp diode D 5be connected to DC bus capacitor C 1negative pole and main switch S 7between emitter, freewheeling period clamp diode D 6be connected to main switch S 8collector electrode and DC bus capacitor C 2positive pole between; Freewheeling period clamp diode D 5negative pole end and D 6positive terminal and connect full bridge inverter;
Described full bridge inverter is the full bridge inverter switch T of four power frequency work 1-T 4form.
Further, two brachium pontis mid point access filters of described full bridge inverter, described filter comprises inductance L 1, inductance L 2, electric capacity C 3, described inductance L 1, electric capacity C 3, inductance L 2be in series successively.
The technical scheme of the inventive method is: a kind of modified model zero-current switching H6 structure non-isolated grid-connected inverter control method, adopts SPWM modulation strategy, selects square wave as carrier wave, two main switch S in modulation strategy 7, S 8be operated in high frequency and open shutoff simultaneously, auxiliary switch S 7r, S 8ralso be operated in high frequency and open off state simultaneously, described auxiliary switch S 7r, S 8roN time be Δ 1+ Δ, wherein L r, C rresonant inductance and electric capacity; Line voltage is divided into positive half cycle and negative half period, comprises 9 working stages at this inverter of the positive half cycle of line voltage:
[t 0~ t 1]: t 0moment, auxiliary switch S 7r, S 8rzero current turning-on, t 0after moment, resonant capacitance C 7r, C 8rrespectively to resonant inductance L 7r, L 7relectric discharge, main switch current i s7, i s8non-linear minimizing is until t 1moment is 0, and then realizes main switch zero-current switching;
[t 1~ t 2]: t 1after moment, resonant capacitance C 7r, C 8rcontinue to resonant inductance L 7r, L 8relectric discharge, resonant inductance current i l7r, i l8rnon-linear increase, resonant capacitor voltage u c7r, u c8rnon-linear minimizing;
[t 2~ t 3): t 2after moment, resonant inductance L 7r, L 8rstart to resonant capacitance C 7r, C 8rreverse charging, resonant capacitor voltage u c7r, u c8rreverse non-linear increase, resonant inductance current i l7r, i l8rnon-linear minimizing, flows through diode D 7, D 8electric current is 0, diode D 7, D 8cut-off;
[t 3]: diode D 7, D 8cut-off make two resonant tank open circuits containing major-minor switching tube, diode D conducting;
(t 3~ t 4]: resonant inductance L 7r, L 8rcontinue to resonant capacitance C 7r, C 8rreverse charging, resonant inductance current i l7r, i l8rnon-linear minimizing, inverter side switching tube anti-paralleled diode i d2, i d3then non-linear increase;
[t 4~ t 5]: auxiliary switch S 7r, S 8rupper no current flows through, and inverter is in freewheeling state;
[t 5~ t 6]: t 5moment, main switch S 7, S 8with auxiliary switch S 7r, S 8rzero current turning-on, two branch road S 7-L 7r-C 7r-S 7r, S 8-L 8r-C 8r-S 8rform closed resonant tank, resonant capacitance C 7r, C 8rstart to resonant inductance L 7r, L 8rreverse charging, resonant inductance current i l7r, i l8r, reverse non-linear increase, resonant capacitor voltage u c7r, u c8rnon-linear reduction;
[t 6~ t 7]: resonant inductance L 7r, L 8rstart to resonant capacitance C 7r, C 8rpositive charge, t 7moment, auxiliary switch S 7r, S 8rzero-current switching;
[t 7~ t 8]: circuit ingoing power transmittance process, after this period terminates, enters the repetition of next cycle.
Further, working stage during described line voltage negative half period is identical with positive half cycle working stage principle.
Further, described auxiliary switch S 7r, S 8roN time be Δ 1+ Δ, wherein L rresonant inductance, C rit is resonant capacitance.
Further, in control procedure, also comprise and select grid current and output voltage as new control variables, adopt two close cycles PI to regulate and realize realizing correcting to grid current.
Beneficial effect of the present invention is: on original zero-current switching H6 structure non-isolated grid-connected inverter basis, resonant inductance L 7r, resonant capacitance C 7rwith auxiliary switch S 7rsource series after with main switch S 7parallel connection, resonant inductance L 8r, resonant capacitance C 8rwith auxiliary switch S 8rsource series after with main switch S 8in parallel.The anode of diode D is connected with MOSFET pipe source electrode, and negative electrode is connected with the drain electrode of MOSFET.And auxiliary switch S 7r, S 8roriginally at AB, CD branch road, move to now and connect with LC, as shown in Figure 1, auxiliary switch tube current can be made by lc unit to be automatically reduced to zero at inverter freewheeling period, thus realize major-minor switch tube zero electric current and turn on and off.Meanwhile change modulation strategy, the parameter of adjustment filter, reduces leakage current, improves the network access quality of power supply, improves circuit working efficiency.
Accompanying drawing explanation
The circuit topological structure that Fig. 1 improves;
Fig. 2 control system block diagram;
The major-minor switching drive signal of Fig. 3 system architecture diagram produces logic;
The equivalent circuit diagram in Fig. 4 zero-current switching H6 structure non-isolated photovoltaic grid-connected inverter each stage when the positive half cycle of line voltage, wherein:
(a) t 0~ t 1stage equivalent circuit diagram;
(b) t 1~ t 2stage equivalent circuit diagram;
(c) t 2~ t 3stage equivalent circuit diagram;
(d) t 3stage equivalent circuit diagram;
(e) t 3~ t 4stage equivalent circuit diagram;
(f) t 4~ t 5stage equivalent circuit diagram;
(g) t 5~ t 6stage equivalent circuit diagram;
(h) t 6~ t 7stage equivalent circuit diagram;
(i) t 7~ t 8stage equivalent circuit diagram.
Embodiment
The specific embodiment of the present invention is further illustrated below in conjunction with accompanying drawing.
The present invention will set about improvement from the following aspects and reach reduction leakage current, reduce switching loss, improve circuit working efficiency.Particular content comprises:
(1) on the topology, auxiliary switch S 7r, S 8roriginally respectively in A-B, C-D branch road, the existing position being moved to red boxes is as shown in the figure helped auxiliary switch and is realized at freewheeling period zero-current switching, and DC side part is by two IGBT main switch S with anti-paralleled diode 7, S 8, resonant inductance L 7r, L 8r, resonant capacitance C 7r, C 8rand two N raceway groove power MOSFET S eliminating anti-paralleled diode 7r, S 8rcomposition, resonant inductance L 7r, L 8requal and opposite in direction, is L r, C 7r, C 8requal and opposite in direction is all C r, T 1-T 4the full bridge inverter switch of four power frequency work, L 1, L 2, C 3constitute filtering link, diode D 5, D 6freewheeling period clamp diode, as shown in Figure 1.
(2) in control method, select grid current and output voltage to be new control variables, adopt two close cycles PI to regulate and realize realizing correcting to grid current, as shown in Figure 2.
(3) in modulator approach, conducting situation in auxiliary switch one cycle is improved, adopt SPWM modulation strategy, in modulation strategy, select square wave as carrier wave.Two main switches are operated in high frequency, and open shutoff simultaneously, and auxiliary switch is also operated in high frequency, and opens shutoff simultaneously.The ON time of original auxiliary switch is l r, C rbe resonant inductance and electric capacity, see the Δ of Fig. 3, and improve one's methods additionally extend ON time Δ based on this 1, make this ensures that there at Δ 1the zero-current switching of main switch is realized in the scope of+delta time.In addition, in order to ensure the zero current turning-on of main switch, add a conducting duty ratio within the scope of main switch ON time, as the dash area of Fig. 3, its value is Δ 1+ Δ.
First, extra prolongation makes auxiliary switch open to solve for 2 times the electric current reverse reflux problem of freewheeling period to cause the disorderly phenomenon of mode, and secondly, carrier wave all selects square wave.Because primary circuit is the zero current turning-on being realized main switch by the anti-paralleled diode of auxiliary switch, new topological structure eliminates the anti-paralleled diode of auxiliary switch, extra interpolation conducting duty ratio D 1the closed-loop path utilizing auxiliary switch and main switch to be formed makes main switch zero current turning-on.In addition, on original circuit auxiliary switch ON time basis, the Δ=t of primary circuit 3-t 0=2.996e-6s extends ON time Δ 1=t 4-t 3=6.04e-7s realizes auxiliary switch zero-current switching, that is: D 2=D 1=t 4-t 0=3.6e-6s, as shown in Figure 3, in this circuit, unipolarity sinusoidal pulse width modulation strategy SPWM not only can make the common-mode voltage of this circuit maintain steady state value, and low switching loss, little current ripples can be obtained than the application of other modulation system, and then the grid current quality obtained and improve conversion efficiency.
(4) in filter process, carry out filtering harmonic wave by carrying out suitably adjustment to the parameter of LCL and make voltage and current with frequency homophase.
Two brachium pontis mid point access filters of full bridge inverter, described filter circuit comprises inductance L 1, inductance L 2, electric capacity C 3, described inductance L 1, inductance L 2, electric capacity C 3be in series successively, the parameter of LCL is carried out suitably adjustment and is carried out filtering harmonic wave and make voltage and current with frequency homophase, and then accesses electrical network again.
(5) novel ZVT-H6 non-isolated grid-connected inverter can not realize the problem of auxiliary switch zero-current switching, improves the circuit structure of this circuit, control method, filter, improves circuit efficiency, reduces leakage current.
As shown in Figure 4, according to improving analysis above, the positive half cycle of one-period comprises 9 operation mode processes to operation principle of the present invention,
First mode: t 0before moment, the switch transistor T of four power frequency work of inverter 1-T 4-S 8-S 7form afterflow Energy Transfer closed-loop path.T 0in the moment, auxiliary switch zero current turning-on, can obtain resonant capacitance C by bank fin 7rresonant capacitor voltage meet resonant inductance L 7rresonant inductance electric current meet i l7r(t 0+)=i l7r(t 0-)=0, in like manner resonant capacitance C 8rresonant capacitor voltage u c8rwith resonance inductance L 8rresonance current i l8r.T 0after moment, auxiliary switch, resonant capacitance, resonant inductance and main switch form two closed resonant tank: S respectively 7r-C 7r-L 7r-S 7, S 8r-C 8r-L 8r-S 8, resonant capacitance C simultaneously 7r, C 8rrespectively to resonant inductance L 7r, L 8relectric discharge, resonance current i l7r, i l8rpress non-linear increase, resonant capacitor voltage u c7r, u c8rby U dacos [ω r(t-t 0)] non-linear minimizing, main switch current i s7, i s8press non-linear minimizing is until t 1moment is 0, and then realizes main switch zero-current switching.Resonance angular frequency resonance impedance resonant inductance current maxima I lS=U da/ Z r.
Second mode: t 1after moment, resonant capacitance C 7r, C 8rcontinue to resonant inductance L 7r, L 8relectric discharge, resonant inductance current i l7r, i l8rnon-linear increase, resonant capacitor voltage u c7r, u c8rnon-linear minimizing.Main switch anti-paralleled diode current i d7, i d8meeting non-linear increase is always until t 2moment resonant inductance L 7r, L 7rcurrent value is resonant capacitance C 7r, C 8rvoltage is 0.
3rd mode: t 2after moment, resonant inductance L 7r, L 8rstart to resonant capacitance C 7r, C 8rreverse charging, resonant capacitor voltage u c7r, u c8rreverse non-linear increase, resonant inductance current i l7r, i l8rnon-linear minimizing is until t 3moment resonant inductance current i l7r(t 3), i l8r(t 3) be , main switch anti-paralleled diode current i d7(t 3), i d8(t 3) be 0, main switch anti-paralleled diode D 7, D 8cut-off.
4th mode: main switch anti-paralleled diode D 7, D 8cut-off make two resonant tank open circuits containing major-minor switching tube, diode D conducting.
5th mode: resonant inductance L 7r, L 8rcontinue to resonant capacitance C 7r, C 8rreverse charging, resonant inductance current i l7r, i l8rnon-linear minimizing, inverter power frequency switching tube anti-paralleled diode then non-linear increase, inverter side forms two resonance continuous current circuits with
6th mode: resonant capacitor voltage u c7r, u c8rkeep resonance maximum-U always da, auxiliary switch S 7r, S 8rupper no current flows through, and inverter is in freewheeling state.
7th mode: t 5moment, main switch S 7, S 8with auxiliary switch S 7r, S 8rzero current turning-on.Article two, closed resonant tank branch road S 7-L 7r-C 7r-S 7r, S 8-L 8r-C 8r-S 8rformed, resonant capacitance C 7r, C 8rstart to resonant inductance L 7r, L 8rreverse charging, resonant inductance current i l7r, i l8r, reverse non-linear increase, resonant capacitor voltage u c7r, u c8rnon-linear reduction.
8th mode: resonant inductance L 7r, L 8rstart to resonant capacitance C 7r, C 8rpositive charge, t 7moment, auxiliary switch S 7r, S 8rzero-current switching.
9th mode: in this period, circuit ingoing power transmittance process, after this period terminates, enters the repetition of next cycle.
Working stage during line voltage negative half period and positive half cycle similar.
Should understand above-mentioned example of executing only to be not used in for illustration of the present invention and to limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.

Claims (6)

1. a modified model zero-current switching H6 structure non-isolated grid-connected inverter, is characterized in that: comprise 2 main switch S with anti-paralleled diode 7, S 8, 2 auxiliary switch S not with anti-paralleled diode 7r, S 8r, 2 resonant inductance L 7r, L 8r, 2 resonant capacitance C 7r, C 8r, 2 DC bus capacitor C 1, C 2, 2 freewheeling period clamp diode D 5, D 6, full bridge inverter switch T 1-T 4;
Described main switch S 7, resonant inductance L 7r, resonant capacitance C 7r, auxiliary switch S 7rbe in series successively, in like manner, main switch S 8, resonant inductance L 8r, resonant capacitance C 8r, auxiliary switch S 8ralso be in series successively, DC bus capacitor C 1positive pole A hold and auxiliary switch S 7rdrain electrode B hold connect, DC bus capacitor C 2negative pole C hold and auxiliary switch S 8rsource electrode D hold connect, B end with D end between be provided with diode D, freewheeling period clamp diode D 5be connected to DC bus capacitor C 1negative pole and main switch S 7between emitter, freewheeling period clamp diode D 6be connected to main switch S 8collector electrode and DC bus capacitor C 2positive pole between; Freewheeling period clamp diode D 5negative pole end and D 6positive terminal and connect full bridge inverter;
Described full bridge inverter is the full bridge inverter switch T of four power frequency work 1-T 4form.
2. modified model zero-current switching H6 structure non-isolated grid-connected inverter according to claim 1, is characterized in that, two brachium pontis mid point access filters of described full bridge inverter, described filter comprises inductance L 1, inductance L 2, electric capacity C 3, described inductance L 1, electric capacity C 3, inductance L 2be in series successively.
3. a modified model zero-current switching H6 structure non-isolated grid-connected inverter control method, is characterized in that:
Adopt SPWM modulation strategy, select square wave as carrier wave in modulation strategy, two main switch S 7, S 8be operated in high frequency and open shutoff simultaneously, auxiliary switch S 7r, S 8ralso be operated in high frequency and open off state simultaneously, line voltage is divided into positive half cycle and negative half period, comprises 9 working stages at this circuit of the positive half cycle of line voltage:
[t 0~ t 1]: t 0moment, auxiliary switch S 7r, S 8rzero current turning-on, t 0after moment, resonant capacitance C 7r, C 8rrespectively to resonant inductance L 7r, L 8relectric discharge, main switch current i s7, i s8non-linear minimizing is until t 1moment is 0, and then realizes main switch zero-current switching;
[t 1~ t 2]: t 1after moment, resonant capacitance C 7r, C 8rcontinue to resonant inductance L 7r, L 8relectric discharge, resonant inductance current i l7r, i l8rnon-linear increase, resonant capacitor voltage u c7r, u c8rnon-linear minimizing;
[t 2~ t 3): t 2after moment, resonant inductance L 7r, L 8rstart to resonant capacitance C 7r, C 8rreverse charging, resonant capacitor voltage u c7r, u c8rreverse non-linear increase, resonant inductance current i l7r, i l8rnon-linear minimizing, flows through diode D 7, D 8electric current is 0, diode D 7, D 8cut-off;
[t 3]: diode D 7, D 8cut-off make two resonant tank open circuits containing major-minor switching tube, diode D conducting;
(t 3~ t 4]: resonant inductance L 7r, L 8rcontinue to resonant capacitance C 7r, C 8rreverse charging, resonant inductance current i l7r, i l8rnon-linear minimizing, inverter side switching tube anti-paralleled diode i d2, i d3then non-linear increase;
[t 4~ t 5]: auxiliary switch S 7r, S 8rupper no current flows through, and inverter is in freewheeling state;
[t 5~ t 6]: t 5moment, main switch S 7, S 8with auxiliary switch S 7r, S 8rzero current turning-on, two branch road S 7-L 7r-C 7r-S 7r, S 8-L 8r-C 8r-S 8rform closed resonant tank, resonant capacitance C 7r, C 8rstart to resonant inductance L 7r, L 8rreverse charging, resonant inductance current i l7r, i l8r, reverse non-linear increase, resonant capacitor voltage u c7r, u c8rnon-linear reduction;
[t 6~ t 7]: resonant inductance L 7r, L 8rstart to resonant capacitance C 7r, C 8rpositive charge, t 7moment, auxiliary switch S 7r, S 8rzero-current switching;
[t 7~ t 8]: circuit ingoing power transmittance process, after this period terminates, enters the repetition of next cycle.
4. modified model zero-current switching H6 structure non-isolated grid-connected inverter control method according to claim 3, it is characterized in that, working stage during described line voltage negative half period is identical with positive half cycle working stage principle.
5. modified model zero-current switching H6 structure non-isolated grid-connected inverter control method according to claim 3, is characterized in that, described auxiliary switch S 7r, S 8roN time be Δ 1+ Δ, wherein L rresonant inductance, C rit is resonant capacitance.
6. modified model zero-current switching H6 structure non-isolated grid-connected inverter control method according to claim 3, it is characterized in that, in control procedure, also comprise and select grid current and output voltage as new control variables, adopt two close cycles PI to regulate and realize realizing correcting to grid current.
CN201510123088.0A 2015-03-19 2015-03-19 A kind of zero-current switching H6 structures non-isolated grid-connected inverter and its control method Expired - Fee Related CN104753384B (en)

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Cited By (2)

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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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