CN104753384B - A kind of zero-current switching H6 structures non-isolated grid-connected inverter and its control method - Google Patents

A kind of zero-current switching H6 structures non-isolated grid-connected inverter and its control method Download PDF

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Publication number
CN104753384B
CN104753384B CN201510123088.0A CN201510123088A CN104753384B CN 104753384 B CN104753384 B CN 104753384B CN 201510123088 A CN201510123088 A CN 201510123088A CN 104753384 B CN104753384 B CN 104753384B
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resonant
current
zero
inductance
auxiliary switch
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CN104753384A (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

Abstract

The invention discloses a kind of modified zero-current switching H6 structures non-isolated grid-connected inverter and its control method, belong to field of power electronics.On the basis of original zero-current switching H6 structure non-isolated grid-connected inverters, resonant inductance L7r, resonant capacitance C7rWith auxiliary switch S7rSource series after with main switch S7Parallel connection, resonant inductance L8r, resonant capacitance C8rWith auxiliary switch S8rSource series after with main switch S8It is in parallel.The anode of diode D is connected with MOSFET pipe source electrodes, and negative electrode is connected with the drain electrode of MOSFET.And auxiliary switch S7r、S8rOriginally in AB, CD branch road, turn now to be connected with LC, in inverter freewheeling period auxiliary switch electric current can be made to be reduced to zero automatically by lc unit, so as to realize that major-minor switch tube zero electric current is turned on and off.At the same time change modulation strategy, adjust the parameter of wave filter, reduce leakage current, improve into network electric energy quality, improve circuit operating efficiency.

Description

A kind of zero-current switching H6 structures non-isolated grid-connected inverter and its control method
Technical field
The invention belongs to parallel network power generation technology electric and electronic technical field, and in particular to one kind is based on zero-current switching The improvement of H6 structure non-isolated grid-connected inverters and method of work.
Background technology
Non-isolated photovoltaic grid-connected inverter is widely used in distributed photovoltaic power generation is emerging, can not only efficiently by the sun Electric energy can be changed into, its portable construction, method simply can also energetically promote the development of power industry.Existing two kinds are reduced electric leakage Stream method is respectively：Method one, drain current suppressing performance is improved based on highest conversion efficiency circuit structure.The method is by changing Enter circuit topology knot, modulation strategy etc. to suppress leakage current；Method two, circuit is improved based on optimal drain current suppressing circuit structure Conversion efficiency.Device loss mainly includes conduction loss and switching loss, but switching device increasingly high frequency causes switch Loss is substantially increased and then influences circuit efficiency, and the use of Sofe Switch can to a certain extent reduce switching loss, mainly It is to eliminate the device loss in switching process by being introduced into resonant process before and after opening.In all differences of Sofe Switch Zero-current switching pwm circuit is gradually ground because of the excessive shortcoming of soft switch circuit current stress before overcoming in the circuit of type The person of studying carefully is applied.A kind of zero-current switching H6 structure non-isolated photovoltaic grid-connected inverters that paper is proposed for second method Can not realize that the zero-current switching and grid current of auxiliary switch have the shortcomings that certain harmonic wave, propose on its basis New topological structure and control method reduce the zero-current switching that leakage current realizes auxiliary switch, while passing through afterflow rank The free clamper of continuous current circuit can make common-mode voltage be a definite value during section.
The content of the invention
For the deficiency of original zero-current switching H6 structure non-isolated grid-connected inverters, the present invention proposes one kind The topological structure and control method of new zero-current switching H6 structure non-isolated grid-connected inverters.
The technical scheme is that：A kind of zero-current switching H6 structure non-isolated grid-connected inverters, including 2 bands There is the main switch S of anti-paralleled diode7、S8, 2 auxiliary switch S without anti-paralleled diode7r、S8r, 2 resonance electricity Sense L7r、L8r, 2 resonant capacitance C7r、C8r, 2 DC bus capacitor C1、C2, 2 freewheeling period clamp diode D5、D6, full-bridge is inverse Become contactor T1-T4；
The main switch S7Emitter stage, resonant inductance L7r, resonant capacitance C7r, auxiliary switch S7rSource electrode phase successively Series connection, similarly, main switch S8Colelctor electrode, resonant inductance L8r, resonant capacitance C8r, auxiliary switch S8rDrain electrode also phase successively Series connection, DC bus capacitor C1Positive pole A ends and auxiliary switch S7rDrain electrode B ends connection, DC bus capacitor C2Negative pole C-terminal and Auxiliary switch S8rSource electrode D ends connection, diode D, the positive pole and auxiliary switch of diode D are provided between B ends and D ends S8rSource electrode D ends connection, freewheeling period clamp diode D5It is connected to DC bus capacitor C1Negative pole and main switch S7Emitter stage Between, freewheeling period clamp diode D5Positive pole and DC bus capacitor C1Negative pole be connected, freewheeling period clamp diode D6Even It is connected on main switch S8Colelctor electrode and DC bus capacitor C2Positive pole between；Freewheeling period clamp diode D6Negative pole and direct current Lateral capacitance C2Positive pole be connected；Freewheeling period clamp diode D5Negative pole end and D6Positive terminal and connect full bridge inverter；Directly Stream lateral capacitance C1With DC bus capacitor C2It is in series；
The full bridge inverter is four full bridge inverter switch T of power frequency work1-T4Constitute.
Further, wave filter is accessed at two bridge arm midpoints of the full bridge inverter, and the wave filter includes inductance L1、 Inductance L2, electric capacity C3, the inductance L1, electric capacity C3, inductance L2It is in series successively.
The technical scheme of the inventive method is：A kind of zero-current switching H6 structures non-isolated grid-connected inverter controlling party Method, square wave is selected using SPWM modulation strategies, in modulation strategy as carrier wave, two main switch S7、S8It is operated in high frequency and simultaneously Open shut-off, auxiliary switch S7r、S8rAlso high frequency is operated in while opening off state, the auxiliary switch S7r、S8rConducting Time is Δ1+ Δ,Wherein Lr、CrIt is resonant inductance and electric capacity；Line voltage is divided into just Half cycle and negative half period, in line voltage positive half cycle, the inverter includes 9 working stages：
[t0~t1]：t0Moment, auxiliary switch S7r、S8rZero current turning-on, t0After moment, resonant capacitance C7r、C8rRespectively To resonant inductance L7r、L8rElectric discharge, main switch electric current iS7、iS8It is non-linear to reduce until t1Moment is 0, and then realizes main switch Zero-current switching；
[t1~t2]：t1After moment, resonant capacitance C7r、C8rContinue to give resonant inductance L7r、L8rElectric discharge, resonant inductance electric current iL7r、iL8rNon-linear increase, resonant capacitor voltage uC7r、uC8rNon-linear reduction；
[t2~t3)：t2After moment, resonant inductance L7r、L8rStart to give resonant capacitance C7r、C8rReverse charging, resonant capacitance electricity Pressure uC7r、uC8rReverse non-linear increase, resonant inductance electric current iL7r、iL8rNon-linear reduction, flows through diode D7、D8Electric current is 0, Diode D7、D8Cut-off；
[t3]：Diode D7、D8Cut-off cause two resonant tanks open circuits containing major-minor switching tube, diode D leads It is logical；
(t3~t4]：Resonant inductance L7r、L8rContinue to give resonant capacitance C7r、C8rReverse charging, resonant inductance electric current iL7r、 iL8rNon-linear reduction, inverter side switching tube anti-paralleled diodeThen non-linear increase；
[t4~t5]：Auxiliary switch S7r、S8rUpper no current flows through, and inverter is in freewheeling state；
[t5~t6]：t5Moment, main switch S7、S8With auxiliary switch S7r、S8rZero current turning-on, two branch road S7- L7r-C7r-S7r、S8-L8r-C8r-S8rForm closure resonant tank, resonant capacitance C7r、C8rStart to give resonant inductance L7r、L8rReversely Charge, resonant inductance electric current iL7r、iL8r, reverse non-linear increase, resonant capacitor voltage uC7r、uC8rNon-linear reduction；
[t6~t7]：Resonant inductance L7r、L8rStart to give resonant capacitance C7r、C8rPositive charge, t7Moment, auxiliary switch S7r、S8rZero-current switching；
[t7~t8]：Circuit ingoing power transmittance process, after the period terminates, repeats into the next cycle.
Further, the working stage during line voltage negative half period is identical with positive half cycle working stage principle.
Further, the auxiliary switch S7r、S8rON time be Δ1+ Δ, Wherein LrIt is resonant inductance, CrIt is resonant capacitance.
Further, in control process, also used as new control variables including selection grid current and output voltage Two close cycles PI adjusts to realize that grid current is realized to correct.
Beneficial effects of the present invention are：On original zero-current switching H6 structures non-isolated grid-connected inverter basis On, resonant inductance L7r, resonant capacitance C7rWith auxiliary switch S7rSource series after with main switch S7Parallel connection, resonant inductance L8r, resonant capacitance C8rWith auxiliary switch S8rSource series after with main switch S8It is in parallel.The anode of diode D with MOSFET pipes source electrode is connected, and negative electrode is connected with the drain electrode of MOSFET.And auxiliary switch S7r、S8rOriginally in AB, CD branch road, now Move to and connected with LC, as shown in figure 1, in inverter freewheeling period auxiliary switch electric current can be made to reduce automatically by lc unit It is zero, so as to realize that major-minor switch tube zero electric current is turned on and off.At the same time change modulation strategy, adjust the ginseng of wave filter Number, reduces leakage current, improves into network electric energy quality, improves circuit operating efficiency.
Brief description of the drawings
The improved circuit topological structures of Fig. 1；
Fig. 2 control system block diagrams；
The major-minor switching drive signal of Fig. 3 system architecture diagrams produces logic；
Fig. 4 zero-current switchings H6 structures non-isolated photovoltaic grid-connected inverter in the positive half cycle of line voltage each stage etc. Effect circuit diagram, wherein：
(a)t0~t1Stage equivalent circuit diagram；
(b)t1~t2Stage equivalent circuit diagram；
(c)t2~t3Stage equivalent circuit diagram；
(d)t3Stage equivalent circuit diagram；
(e)t3~t4Stage equivalent circuit diagram；
(f)t4~t5Stage equivalent circuit diagram；
(g)t5~t6Stage equivalent circuit diagram；
(h)t6~t7Stage equivalent circuit diagram；
(i)t7~t8Stage equivalent circuit diagram.
Specific embodiment
Specific embodiment of the invention is further illustrated below in conjunction with the accompanying drawings.
The present invention will set about improvement and reach reduction leakage current from the following aspects, reduce switching loss, improve circuit work Make efficiency.Particular content includes：
(1) on the topology, auxiliary switch S7r、S8rOriginally respectively in A-B, C-D branch roads, be now moved into as Scheme the position of shown red boxes to help auxiliary switch to realize that in freewheeling period zero-current switching DC side part is by two IGBT main switches S with anti-paralleled diode7、S8, resonant inductance L7r、L8r, resonant capacitance C7r、C8rAnd two eliminate The N-channel power MOSFET S of anti-paralleled diode7r、S8rComposition, resonant inductance L7r、L8rIt is equal in magnitude, it is Lr,C7r、C8r It is equal in magnitude, all it is Cr, T1-T4It is four full bridge inverter switches of power frequency work, L1、L2、C3Constitute filtering link, two Pole pipe D5、D6It is freewheeling period clamp diode, as shown in Figure 1.
(2) in control method, selection grid current and output voltage are new control variables, are adjusted using two close cycles PI To realize that grid current is realized to correct, as shown in Figure 2.
(3) in modulator approach, improve turning on situation in the cycle of auxiliary switch one, plan is modulated using SPWM Slightly, square wave is selected in modulation strategy as carrier wave.Two main switches are operated in high frequency, and open shut-off, auxiliary switch simultaneously Also high frequency is operated in, and opens shut-off simultaneously.The ON time of original auxiliary switch isLr、CrIt is humorous Shake inductance and electric capacity, sees the Δ of Fig. 3, and be based on the improved method and additionally extend ON time Δ1So that This ensures that there in Δ1The zero-current switching of main switch is realized in the range of+delta time.In addition, in order to ensure main switch The zero current turning-on of pipe, increased a conducting dutycycle, such as dash area of Fig. 3 in the range of main switch ON time, Its value is Δ1+Δ。
First, extra extension causes that auxiliary switch is opened 2 times and caused solving the problems, such as the electric current reverse reflux of freewheeling period Mode disorder phenomenon, secondly, carrier wave all selects square wave.Because primary circuit is come real by the anti-paralleled diode of auxiliary switch The zero current turning-on of existing main switch, new topological structure eliminates the anti-paralleled diode of auxiliary switch, extra addition Conducting dutycycle D1The closed-loop path formed using auxiliary switch and main switch causes main switch zero current turning-on.In addition, On the basis of original circuit auxiliary switch ON time, the Δ=t of primary circuit3-t0During=2.996e-6s extension conductings Between Δ1=t4-t3=6.04e-7s realizes auxiliary switch zero-current switching, i.e.,：D2=D1=t4-t0=3.6e-6s, such as schemes Shown in 3, that the common-mode voltage of the circuit can not only maintained is constant for unipolarity sinusoidal pulse width modulation strategy SPWM in the circuit Value, and low switching loss, small current ripples can be obtained than the application of other modulation systems, and then entering of obtaining Net current quality and raising conversion efficiency.
(4) in filter process, carry out appropriate adjustment by the parameter to LCL to filter harmonic wave and cause voltage and electricity Stream is with the same phase of frequency.
Wave filter is accessed at two bridge arm midpoints of full bridge inverter, and the filter circuit includes inductance L1, inductance L2, electricity Hold C3, the inductance L1, inductance L2, electric capacity C3It is in series successively, the parameter of LCL carries out appropriate adjustment to filter harmonic wave and cause Voltage and current accesses power network again with the same phase of frequency.
(5) new ZVT-H6 non-isolated grid-connected inverters can not realize asking for auxiliary switch zero-current switching Topic, circuit structure, control method to the circuit, wave filter are improved, and improve circuit efficiency, reduce leakage current.
Operation principle of the invention more than as shown in figure 4, improve analysis, the positive half cycle of a cycle includes 9 works Make mode process,
First mode：t0Before moment, the switch transistor T of four power frequencies work of inverter1-T4-S8-S7Form afterflow energy Amount transmission closed-loop path.t0Moment, auxiliary switch zero current turning-on can obtain resonant capacitance C by bank fin7rResonant capacitance Voltage meetsResonant inductance L7rResonant inductance electric current meet iL7r(t0+) =iL7r(t0-)=0, similarly resonant capacitance C8rResonant capacitor voltage uC8rWith resonant inductance L8rResonance current iL8r。t0Moment Afterwards, auxiliary switch, resonant capacitance, resonant inductance and main switch form two closure resonant tanks respectively：S7r-C7r-L7r-S7、 S8r-C8r-L8r-S8, while resonant capacitance C7r、C8rRespectively to resonant inductance L7r、L8rElectric discharge, resonance current iL7r、iL8rPressNon-linear increase, resonant capacitor voltage uC7r、uC8rBy Udacos[ωr(t-t0)] non-linear reduction, it is main to open Close tube current iS7、iS8PressIt is non-linear to reduce until t1Moment is 0, and then realizes the electricity of main switch zero Stream shut-off.Resonance angular frequencyResonance impedanceResonant inductance current maxima ILS=Uda/Zr。
Second mode：t1After moment, resonant capacitance C7r、C8rContinue to give resonant inductance L7r、L8rElectric discharge, resonant inductance electricity Stream iL7r、iL8rNon-linear increase, resonant capacitor voltage uC7r、uC8rNon-linear reduction.Main switch anti-paralleled diode electric current iD7、 iD8Non-linear always can be increased up t2Moment resonant inductance L7r、L8rCurrent value isResonant capacitance C7r、C8rVoltage is 0.
3rd mode：t2After moment, resonant inductance L7r、L8rStart to give resonant capacitance C7r、C8rReverse charging, resonance electricity Hold voltage uC7r、uC8rReverse non-linear increase, resonant inductance electric current iL7r、iL8rIt is non-linear to reduce until t3Moment resonant inductance electricity Stream iL7r(t3)、iL8r(t3) it is IL1, main switch anti-paralleled diode electric current iD7(t3)、iD8(t3) it is 0, main switch inverse parallel Diode D7、D8Cut-off.
4th mode：Main switch anti-paralleled diode D7、D8Cut-off cause two resonance containing major-minor switching tube Loop open circuit, diode D conductings.
5th mode：Resonant inductance L7r、L8rContinue to give resonant capacitance C7r、C8rReverse charging, resonant inductance electric current iL7r、 iL8rNon-linear reduction, inverter power frequency switching tube anti-paralleled diodeThen non-linear increase, inverter side forms two Bar resonance continuous current circuitWith
6th mode：Resonant capacitor voltage uC7r、uC8rIt is always maintained at resonance maximum-Uda, auxiliary switch S7r、S8r Upper no current flows through, and inverter is in freewheeling state.
7th mode：t5Moment, main switch S7、S8With auxiliary switch S7r、S8rZero current turning-on.Two closure is humorous Circuit branch of shaking S7-L7r-C7r-S7r、S8-L8r-C8r-S8rFormed, resonant capacitance C7r、C8rStart to give resonant inductance L7r、L8rReversely Charge, resonant inductance electric current iL7r、iL8r, reverse non-linear increase, resonant capacitor voltage uC7r、uC8rNon-linear reduction.
8th mode：Resonant inductance L7r、L8rStart to give resonant capacitance C7r、C8rPositive charge, t7Moment, auxiliary switch Pipe S7r、S8rZero-current switching.
9th mode：In the period, circuit ingoing power transmittance process, after the period terminates, into the next cycle Repeat.
Working stage during line voltage negative half period is similar with positive half cycle.
It should be understood that above-mentioned example of applying is only illustrative of the invention and is not intended to limit the scope of the invention, the present invention is being read Afterwards, modification of the those skilled in the art to the various equivalent form of values of the invention falls within the application appended claims and is limited Scope.

Claims (6)

1. a kind of zero-current switching H6 structure non-isolated grid-connected inverters, it is characterised in that：Inverse parallel two is carried including 2 The main switch S of pole pipe7、S8, 2 auxiliary switch S without anti-paralleled diode7r、S8r, 2 resonant inductance L7r、L8r, 2 Individual resonant capacitance C7r、C8r, 2 DC bus capacitor C1、C2, 2 freewheeling period clamp diode D5、D6, full bridge inverter switch T1-T4；
The main switch S7Emitter stage, resonant inductance L7r, resonant capacitance C7r, auxiliary switch S7rSource electrode be in series successively, Similarly, main switch S8Colelctor electrode, resonant inductance L8r, resonant capacitance C8r, auxiliary switch S8rDrain electrode be also in series successively, DC bus capacitor C1Positive pole A ends and auxiliary switch S7rDrain electrode B ends connection, DC bus capacitor C2Negative pole C-terminal and auxiliary Switching tube S8rSource electrode D ends connection, diode D, the positive pole and auxiliary switch S of diode D are provided between B ends and D ends8r's Source electrode D ends connect, freewheeling period clamp diode D5It is connected to DC bus capacitor C1Negative pole and main switch S7Emitter stage it Between, freewheeling period clamp diode D5Positive pole and DC bus capacitor C1Negative pole be connected, freewheeling period clamp diode D6Connection In main switch S8Colelctor electrode and DC bus capacitor C2Positive pole between；Freewheeling period clamp diode D6Negative pole and DC side Electric capacity C2Positive pole be connected；Freewheeling period clamp diode D5Negative pole end and D6Positive terminal and connect full bridge inverter；Direct current Lateral capacitance C1With DC bus capacitor C2It is in series；
The full bridge inverter is four full bridge inverter switch T of power frequency work1-T4Constitute.
2. zero-current switching H6 structure non-isolated grid-connected inverters according to claim 1, it is characterised in that described Wave filter is accessed at two bridge arm midpoints of full bridge inverter, and the wave filter includes inductance L1, inductance L2, electric capacity C3, the electricity Sense L1, electric capacity C3, inductance L2It is in series successively.
3. a kind of zero-current switching H6 structures non-isolated grid-connected inverter control as described in claim 1-2 any one Method, it is characterised in that：
Square wave is selected using SPWM modulation strategies, in modulation strategy as carrier wave, two main switch S7、S8It is operated in high frequency and same Shi Kaitong is turned off, auxiliary switch S7r、S8rAlso high frequency is operated in while opening off state, and line voltage is divided into positive half cycle and bears Half cycle, 9 working stages are included in line voltage positive half cycle zero-current switching H6 structures non-isolated grid-connected inverter：
[t0~t1]：t0Moment, auxiliary switch S7r、S8rZero current turning-on, t0After moment, resonant capacitance C7r、C8rRespectively to humorous Shake inductance L7r、L8rElectric discharge, main switch electric current iS7、iS8It is non-linear to reduce until t1Moment is 0, and then realizes the electricity of main switch zero Stream shut-off；
[t1~t2]：t1After moment, resonant capacitance C7r、C8rContinue to give resonant inductance L7r、L8rElectric discharge, resonant inductance electric current iL7r、 iL8rNon-linear increase, resonant capacitor voltage uC7r、uC8rNon-linear reduction；
[t2~t3)：t2After moment, resonant inductance L7r、L8rStart to give resonant capacitance C7r、C8rReverse charging, resonant capacitor voltage uC7r、uC8rReverse non-linear increase, resonant inductance electric current iL7r、iL8rNon-linear reduction, flows through diode D7、D8Electric current is 0, two Pole pipe D7、D8Cut-off；
[t3]：Diode D7、D8Cut-off cause two containing major-minor switching tube resonant tanks open circuit, diode D conducting；
(t3~t4]：Resonant inductance L7r、L8rContinue to give resonant capacitance C7r、C8rReverse charging, resonant inductance electric current iL7r、iL8rNon-thread Property reduce, inverter side switching tube anti-paralleled diode iD2、iD3Then non-linear increase；
[t4~t5]：Auxiliary switch S7r、S8rUpper no current flows through, and inverter is in freewheeling state；
[t5~t6]：t5Moment, main switch S7、S8With auxiliary switch S7r、S8rZero current turning-on, two branch road S7-L7r-C7r- S7r、S8-L8r-C8r-S8rForm closure resonant tank, resonant capacitance C7r、C8rStart to give resonant inductance L7r、L8rReverse charging, it is humorous Shake inductive current iL7r、iL8r, reverse non-linear increase, resonant capacitor voltage uC7r、uC8rNon-linear reduction；
[t6~t7]：Resonant inductance L7r、L8rStart to give resonant capacitance C7r、C8rPositive charge, t7Moment, auxiliary switch S7r、S8r Zero-current switching；
[t7~t8]：Circuit ingoing power transmittance process, after the period terminates, repeats into the next cycle.
4. zero-current switching H6 structures non-isolated grid-connected inverter control method according to claim 3, its feature It is that the working stage during line voltage negative half period is identical with positive half cycle working stage principle.
5. zero-current switching H6 structures non-isolated grid-connected inverter control method according to claim 3, its feature It is, the auxiliary switch S7r、S8rON time be Δ1+ Δ,Wherein LrIt is humorous Shake inductance, CrIt is resonant capacitance.
6. zero-current switching H6 structures non-isolated grid-connected inverter control method according to claim 3, its feature It is in control process, also to be adjusted using two close cycles PI as new control variables including selection grid current and output voltage Save to realize that grid current is realized to correct.
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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