CN109038677A - A kind of efficient six switch singles grid-connected converter - Google Patents
A kind of efficient six switch singles grid-connected converter Download PDFInfo
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- CN109038677A CN109038677A CN201811036830.4A CN201811036830A CN109038677A CN 109038677 A CN109038677 A CN 109038677A CN 201811036830 A CN201811036830 A CN 201811036830A CN 109038677 A CN109038677 A CN 109038677A
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- 238000005070 sampling Methods 0.000 claims description 25
- 230000005611 electricity Effects 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 239000000306 component Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
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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
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of high six switch single grid-connected converters of effect, power switch tube Q3 and power switch tube Q4 including being composed in series the first bridge arm, and it is composed in series the power switch tube Q1 and power switch tube Q2 of the second bridge arm, first bridge arm and the second bridge arm compose in parallel single-phase inversion full-bridge, it further include connecting DC side after the power switch tube Q6 and power switch tube Q5, the converting branch both ends shunt capacitance C for being composed in series converting branch；The bus anode of the inversion full-bridge is connected through inductance Lr with the midpoint of converting branch, and bus negative terminal connects the cathode of converting branch, and the ac output end of the inversion full-bridge is through inductance Lg connection grid side；The current transformer uses DC voltage grid side current double closed-loop control system.The present invention realizes the sinusoidal control of grid current, while realizing the two-way flow of energy, can inhibit leakage current well, and switching loss is low, improves conversion efficiency, realizes efficient conversion.
Description
Technical field
The present invention relates to grid-connected converter fields, and in particular to a kind of efficient six switch singles grid-connected converter.
Background technique
Single-phase grid-connection converter is the core component of grid-connected power generation system especially low capacity grid-connected photovoltaic system,
Its major function is that the direct current energy for issuing photovoltaic module is controlled by the closed loop SPWM of current transformer current on line side DC voltage
Strategy processed is transformed into AC energy feed-in power grid, and the basic demand to single-phase grid-connected electricity generation system is the stable electric energy of high efficient and reliable
Transformation, current single-phase grid-connection converter topological structure are divided into the grid-connected change of transless structure grid-connected converter and transformer isolation
Flow device, the former has many advantages, such as that system bulk is small light-weight and conversion efficiency is high, the latter with DC side and net side electrically every
From, eliminate photovoltaic parallel in system in common mode leakage current the features such as, but because increased transformer either DC side isolation also
It is power frequency isolation, can all reduces system changeover efficiency, therefore the single-phase grid-connection converter without isolating transformer becomes current light
The research hotspot in photovoltaic grid-connected field.
The current topological structure without isolating transformer mainly has the transformation of DC/DC+DC/AC two-stage type and single-phase full bridge PWM
Two types are converted, the parallel network reverse link in both topological structures all has system drain current suppressing, solves electric leakage
The topological structure of flow problem mainly has DC side to bypass full-bridge topology, high efficiency reliability inverter topology (High
Efficiency Reliable Inverter Concept, HERIC) and the structures such as H5 bridge topology, these circuit structures are all
It is to increase the common mode current that full control power device generates full-bridge device HF switch on the basis of single-phase PWM full-bridge to bypass or lead to
After the on-off mode for rationally controlling increased full-controlled device, the common-mode voltage of control system is a constant, therefore can eliminate and be
System leakage current.Above single-phase grid-connected inverter topological structure increases because to realize the efficient conversion of inhibition system leakage current
The complexity of circuit structure, and the switch control of power device becomes more complicated.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of efficient six switch singles grid-connected converters, inhibit realizing
Under the premise of system leakage current, the two-way flow of energy can be realized, and system switching loss is low, conversion efficiency is high.
The invention is realized by the following technical scheme:
A kind of high six switch single grid-connected converter of effect, power switch tube Q3 and function including being composed in series the first bridge arm
Rate switching tube Q4, and it is composed in series the power switch tube Q1 and power switch tube Q2, the first bridge arm and the second bridge of the second bridge arm
Arm composes in parallel single-phase inversion full-bridge, further includes the power switch tube Q6 and power switch tube Q5 for being composed in series converting branch,
DC side is connected after the converting branch both ends shunt capacitance C；The bus anode of the inversion full-bridge is through inductance Lr and conversion branch
The midpoint on road is connected, and bus negative terminal connects the cathode of converting branch, and the ac output end of the inversion full-bridge is connected through inductance Lg
Grid side；The current transformer uses DC voltage grid side current double closed-loop control system.
Further scheme of the invention is that the DC voltage grid side current double closed-loop control system includes with reference to electricity
Potential source, DC voltage sampling unit, grid side current sampling unit, grid side voltage sampling unit；Reference voltage source generates
Reference voltageThe difference of the DC voltage feedback quantity Kvf obtained with DC voltage sampling unit, through voltage regulator
Operation obtains direct current signal, and the voltage sampling signal that the direct current signal and grid side voltage sampling unit obtain is through multiplier computation
Obtained sinusoidal reference value is as grid side current reference amount；The grid side current reference amount is obtained with grid side current sampling unit
The difference of the current on line side value of feedback taken obtains modulation waveform through current regulator operation, the modulation waveform and sawtooth pattern carrier wave
The SPWM signal of driving power switching tube Q6 and power switch tube Q5 are obtained through comparator；What grid side voltage sampling unit obtained
Voltage sampling signal also obtains the control signal of the first bridge arm and the second bridge arm through zero-crossing comparator.
The advantages of the present invention over the prior art are that:
DC voltage grid side current double closed-loop control system realizes the sinusoidal control of grid current, while realizing energy
Two-way flow, and form the Sofe Switch mode of the power frequency no-voltage of four power switch tubes of single-phase inversion full-bridge, and open
Pass mode can be realized the locking phase to grid side, can inhibit leakage current in photovoltaic system well, become compared to traditional full-bridge
It changes, the voltage stress for forming four power switch tubes of single-phase inversion full-bridge is lower, and system switching loss is low, it is possible to improve
Conversion efficiency realizes the efficient conversion of electric energy.
Detailed description of the invention
Fig. 1 is the topology diagram of six switch single grid-connected converters of the invention.
Fig. 2 is DC voltage grid side current double closed-loop control system block diagram.
Fig. 3 is the electric leakage current circuit that the present invention is used for photovoltaic generating system.
Fig. 4 is the equivalent circuit diagram of Fig. 3.
When Fig. 5 is that the present invention works in rectifier system, grid side current-voltage waveform figure.
When Fig. 6 is that the present invention works in rectifier system, DC voltage waveform diagram.
Specific embodiment
The efficient six switch singles grid-connected converter of one kind as depicted in figs. 1 and 2, including being composed in series the first bridge arm
Power switch tube Q3 and power switch tube Q4, and it is composed in series the power switch tube Q1 and power switch tube Q2 of the second bridge arm,
First bridge arm and the second bridge arm compose in parallel single-phase inversion full-bridge, convert for realizing the DC-AC of electric energy；It further include series connection
The power switch tube Q6 and power switch tube Q5 of converting branch are formed, power switch tube Q6 and power switch tube Q5 work in sine
DC voltage is converted half-sinusoid waveform in pairs, after the converting branch both ends shunt capacitance C by pulse width modulation mode (SPWM)
DC side is connected, capacitor C is filtered for DC side, midpoint of the bus anode of the inversion full-bridge through inductance Lr and converting branch
It is connected, bus negative terminal connects the cathode of converting branch, and the midpoint A of first bridge arm and the midpoint B of the second bridge arm are as exchange
Output end, respectively through inductance Lg connection grid side, in photovoltaic grid-connected inverting when inductance Lg is for inhibiting inverter bridge power frequency switch
The power frequency leakage current generated in system, the harmonic wave that inductance Lr is used to that power device High ireguency SPWM switch to be inhibited to generate；The current transformer
Using DC voltage grid side current double closed-loop control system.
The DC voltage grid side current double closed-loop control system includes reference voltage source, DC voltage sampling list
Member, grid side current sampling unit, grid side voltage sampling unit, voltage regulator, current regulator；Voltage regulator is used for
The reference voltage that the floating regulation of DC voltage, reference voltage source are generatedIt is obtained with DC voltage sampling unit
DC voltage feedback quantity Kvf difference, obtain direct current signal through voltage regulator operation, the direct current signal and grid side electricity
The sinusoidal reference value that the voltage sampling signal that pressure sampling unit obtains is obtained through multiplier computation is as grid side current reference amount；
The difference for the current on line side value of feedback that the grid side current reference amount and grid side current sampling unit obtain, through current regulator
Operation obtains modulation waveform, and the modulation waveform and preset sawtooth pattern carrier wave obtain driving power switching tube Q6 and function through comparator
The SPWM signal of rate switching tube Q5 realizes High Power Factor so that the DC side in individual event full-bridge circuit obtains double half-sinusoids
Grid-connected transformation of electrical energy, which is the periodic ramp signal that a high frequency and amplitude are lower than modulation waveform；Grid side electricity
The voltage sampling signal for pressing sampling unit to obtain also realizes the real-time locking phase to power grid through zero-crossing comparator, while realizing in power grid
Voltage positive half cycle, power switch tube Q1 and power switch tube Q4 are open-minded, and negative half period power switch tube Q2 and power switch tube Q3 are opened
It is logical, it is known that power switch tube Q1, power switch tube Q2, power switch tube Q3, power switch tube Q4 are in network voltage zero passage
Point switch, that is, realize Sofe Switch, ensure that the efficient conversion of system.
When the six switch single grid-connected converters of the application are applied to low capacity photovoltaic generating system, such as Fig. 3 and Fig. 4 institute
Show, 4 power switch tubes of composition single-phase inversion full-bridge all work in power frequency mode, and the leakage current of system is mainly by the first bridge arm
Midpoint A and the second bridge arm midpoint B to the voltage u of DC side power supply negative terminalAO、uBOAnd network voltage ugThe shape in work mould circuit
At electric leakage flow component composition, and these three voltages are all power frequency quantities, so electric leakage flow component is minimum, are far below Germany VDE-
The grid-connected electric leakage flow standard of 0126-1-1.
When the six switch single grid-connected converters of the application are rectified for single-phase High Power Factor, in grid side current reference
When current transformer (i.e. rectifier convention) is directed toward by power grid in direction, reference voltagePass through with the error of DC voltage feedback quantity
Voltage regulator output is a positive DC quantity, so the reference i of grid currentgrefPhase is consistent with network voltage, rationally sets
Current regulator parameter is counted, the unit High Power Factor operation of grid-connected converter may be implemented, if DC side access new energy hair
The DC source link of electricity, power generation link increase DC voltage, so that Voltage loop output becomes negative value, pass through multiplier ring
Section is so that igrefWith network voltage reverse phase, the double-closed-loop control of system DC side energy is presented in a manner of watt current
Enter power distribution network, and the electric energy that DC side issues is more, Voltage loop output absolute value is bigger, and the electric current of feed-in power grid is bigger.
To exchange side voltage as 220V/50Hz, DC side reference voltage is 400V, and net side filter inductance Lg is 5mH, load
When resistance R is 200 Ω, Fig. 5 gives voltage on line side and current waveform, and Fig. 6 is DC voltage waveform, it can be seen that this single-phase six
The network side current waveform sine degree for switching grid-connected converter is good, and power factor is high, and DC voltage pulsation is small.
The six switch single grid-connected converters that this programme is related to, pass through the two close cycles control to DC voltage grid side electric current
Mode processed, and to the real-time locking phase of voltage on line side, realize the stabilization of DC voltage and the sinusoidal control of ac-side current
System, and the rectification of realization High Power Factor and parallel network reverse working method that can be convenient according to the property of direct current lateral load, should
Circuit structure realizes the power frequency Sofe Switch mode of major power device, improves system changeover efficiency, and send out for photovoltaic
System current leakage is efficiently solved when electric, therefore in low capacity photovoltaic generating system, micro-grid system and direct-current charging post
Etc. occasions have broad prospect of application.
Claims (2)
1. a kind of efficient six switch singles grid-connected converter, power switch tube Q3 and power including being composed in series the first bridge arm
Switching tube Q4, and it is composed in series the power switch tube Q1 and power switch tube Q2, the first bridge arm and the second bridge arm of the second bridge arm
Compose in parallel single-phase inversion full-bridge, it is characterised in that: further include the power switch tube Q6 and power for being composed in series converting branch
DC side is connected after switching tube Q5, the converting branch both ends shunt capacitance C；The bus anode of the inversion full-bridge is through inductance Lr
It is connected with the midpoint of converting branch, bus negative terminal connects the cathode of converting branch, and the ac output end of the inversion full-bridge is through electricity
Feel Lg connection grid side；The current transformer uses DC voltage grid side current double closed-loop control system.
2. a kind of efficient six switch singles grid-connected converter as described in claim 1, it is characterised in that: the DC side electricity
Piezoelectricity net side current double closed-loop control system includes reference voltage source, DC voltage sampling unit, grid side current sample list
Member, grid side voltage sampling unit；The reference voltage that reference voltage source generatesIt is obtained with DC voltage sampling unit straight
The difference for flowing side Voltage Feedback amount Kvf, obtains direct current signal through voltage regulator operation, which adopts with grid side voltage
The sinusoidal reference value that the voltage sampling signal that sample unit obtains is obtained through multiplier computation is as grid side current reference amount；The electricity
The difference for the current on line side value of feedback that current on line side datum quantity and grid side current sampling unit obtain, through current regulator operation
Modulation waveform is obtained, the modulation waveform and sawtooth pattern carrier wave obtain driving power switching tube Q6 and power switch tube Q5 through comparator
SPWM signal；The voltage sampling signal that grid side voltage sampling unit obtains also obtains the first bridge arm and the through zero-crossing comparator
The control signal of two bridge arms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811036830.4A CN109038677A (en) | 2018-09-05 | 2018-09-05 | A kind of efficient six switch singles grid-connected converter |
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| CN201811036830.4A CN109038677A (en) | 2018-09-05 | 2018-09-05 | A kind of efficient six switch singles grid-connected converter |
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| CN109038677A true CN109038677A (en) | 2018-12-18 |
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| CN201811036830.4A Withdrawn CN109038677A (en) | 2018-09-05 | 2018-09-05 | A kind of efficient six switch singles grid-connected converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220085756A1 (en) * | 2019-05-31 | 2022-03-17 | Huawei Digital Power Technologies Co., Ltd. | Inverter circuit, inverter, and photovoltaic power system |
| CN115664222A (en) * | 2022-12-12 | 2023-01-31 | 惠州市乐亿通科技有限公司 | Bidirectional DC conversion circuit and power supply device |
| US12034380B2 (en) * | 2019-05-31 | 2024-07-09 | Huawei Digital Power Technologies Co., Ltd. | Inverter circuit based on a heric topology, inverter, and photovoltaic power system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20220085756A1 (en) * | 2019-05-31 | 2022-03-17 | Huawei Digital Power Technologies Co., Ltd. | Inverter circuit, inverter, and photovoltaic power system |
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Application publication date: 20181218 |