CN116683787A - Soft switching non-isolated grid-connected inverter circuit capable of running with zero switching loss - Google Patents
Soft switching non-isolated grid-connected inverter circuit capable of running with zero switching loss Download PDFInfo
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- CN116683787A CN116683787A CN202310962717.3A CN202310962717A CN116683787A CN 116683787 A CN116683787 A CN 116683787A CN 202310962717 A CN202310962717 A CN 202310962717A CN 116683787 A CN116683787 A CN 116683787A
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- 239000003990 capacitor Substances 0.000 claims abstract description 65
- 238000002955 isolation Methods 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 21
- 230000003111 delayed effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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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
- H02M7/53871—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 with automatic control of output voltage or current
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0051—Diode reverse recovery losses
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M7/4815—Resonant converters
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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
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a soft switch non-isolation grid-connected inverter circuit capable of running with zero switching loss, which comprises an inverter circuit, a power switch group, a follow current switch group and an auxiliary resonance network, wherein the inverter circuit comprises a bus capacitor group, a power switch group, a resonance network formed by adding a full-control switch, a resonance capacitor and a resonance inductor, and the power switch tube S can be realized under the corresponding switch control time sequence 1 ～S 5 Zero-current on and zero-current off, freewheel switch tube S f2 And S is f4 Zero-current on and zero-current off, power switch tube S 5a And S is 4a Zero current on and zero current off, auxiliary power diode D a1 ～D a4 Zero current turn-off, eliminationThe reverse recovery problem of the diode is solved. The inverter circuit can realize zero-switching-loss operation, so that the non-isolated inverter circuit breaks through the limitation of switching loss on switching frequency, and is beneficial to improving the switching frequency.
Description
Technical Field
The invention relates to a soft-switching non-isolated grid-connected inverter circuit capable of running with zero switching loss, and belongs to the technical field of soft switching of inverter circuits.
Background
The non-isolated photovoltaic grid-connected inverter has the advantages of simple structure and high efficiency, and is widely applied in industry. The existing inverter circuit generally operates in a hard switching mode, such as the H5 inverter circuit disclosed in patent US 7411802 B2 shown in fig. 1. In order to achieve higher conversion efficiency, the existing inverter can only work at a lower switching frequency, so that larger filter inductance and filter capacitance are required, and the power density and cost of the inverter are increased.
The main factor limiting the increase of the switching frequency of the non-isolated grid-connected inverter is the switching loss, and the higher the switching frequency is, the larger the switching loss is, so that the lower the inversion efficiency is, and a larger-sized heat dissipation device is required.
Disclosure of Invention
The invention aims to solve the technical problems that: how to improve the switching frequency of the existing non-isolated grid-connected inverter, thereby improving the inversion efficiency.
In order to solve the technical problems, the invention provides a soft-switching non-isolated grid-connected inverter circuit capable of running with zero switching loss, which comprises:
the device comprises a bus capacitor group, a power switch, a follow current switch and an auxiliary resonance network;
the fifth power switch, the first power switch and the second power switch are sequentially connected in series and then are connected to two ends of the bus capacitor group;
the fifth power switch, the third power switch and the fourth power switch are sequentially connected in series and then connected to two ends of the bus capacitor group;
the auxiliary resonance network comprises a first auxiliary resonance unit, wherein the first auxiliary resonance unit is connected to two ends of a fifth power switch, the first auxiliary resonance unit is connected with a second auxiliary resonance unit through an intermediate inductor, the second auxiliary resonance unit is connected to a node between the first power switch and the second power switch through a second follow current switch, the second auxiliary resonance unit is connected to a node between the third power switch and the fourth power switch through a fourth follow current switch, and the second auxiliary resonance unit is simultaneously connected to a bus capacitor group;
the first intake filter inductor, the intake filter capacitor and the second intake filter inductor are sequentially connected in series, and then two ends of the first intake filter inductor and the second intake filter inductor are respectively connected with a node between the first power switch and the second power switch and a node between the third power switch and the fourth power switch.
The soft switching non-isolated grid-connected inverter circuit capable of running with zero switching loss comprises a first power switch tube and a first power diode which are connected in parallel.
The soft switching non-isolated grid-connected inverter circuit capable of running with zero switching loss comprises a second power switching tube and a second power diode which are connected in parallel.
The soft switching non-isolated grid-connected inverter circuit capable of running with zero switching loss comprises a third power switch tube and a third power diode which are connected in parallel.
The soft switching non-isolated grid-connected inverter circuit capable of running with zero switching loss comprises a fourth power switch tube and a fourth power diode which are connected in parallel.
The soft switching non-isolated grid-connected inverter circuit capable of running with zero switching loss comprises a fifth power switch tube and a fifth power diode which are connected in parallel.
The soft switching non-isolated grid-connected inverter circuit capable of running with zero switching loss comprises a second freewheeling switch tube, wherein the second freewheeling switch tube is connected with a diode in parallel.
The fourth freewheel switch comprises a fourth freewheel switch tube which is connected with a diode in parallel.
The soft switching non-isolation grid-connected inverter circuit capable of running with zero switching loss comprises a first auxiliary power diode and a second auxiliary power diode, wherein the cathodes of the first auxiliary power diode and the second auxiliary power diode are connected to a fifth power switch and a node between the first power switches, a first auxiliary capacitor is connected between the anodes of the first auxiliary power diode and the second auxiliary power diode, one end of a seventh power switch is connected to one end of a bus capacitor group, and the other end of the seventh power switch is connected to the anode of the first auxiliary power diode; the anode of the second auxiliary power diode is connected to the intermediate inductance.
The soft switching non-isolation grid-connected inverter circuit capable of running with zero switching loss, wherein the second auxiliary resonance unit comprises a third auxiliary power diode and a fourth auxiliary power diode, the negative electrode of the third auxiliary power diode is connected to the other end of the bus capacitor group through a second auxiliary capacitor and a sixth power switch tube, the positive electrode of the third auxiliary power diode is simultaneously connected with the positive electrodes of a second follow current switch and a fourth auxiliary power diode, the negative electrode of the fourth auxiliary power diode is connected to the sixth power switch tube, and the positive electrode of the fourth auxiliary power diode is connected with the fourth follow current switch; the cathode of the third auxiliary power diode is connected to the intermediate inductance.
The soft switching non-isolated grid-connected inverter circuit capable of running with zero switching loss comprises a bus capacitor group.
The soft switching non-isolated grid-connected inverter circuit capable of running with zero switching loss comprises two bus capacitors which are connected in series, wherein the bus capacitors are a first bus capacitor and a second bus capacitor respectively;
the intermediate inductor comprises a first intermediate inductor and a second intermediate inductor which are connected in series;
the node between the first intermediate inductance and the second intermediate inductance is connected to the node between the first bus capacitance and the second bus capacitance.
The invention has the beneficial effects that: the soft switching non-isolation grid-connected inverter circuit capable of running with zero switching loss can realize a power switching tube S under the corresponding switching control time sequence by adding a resonant network consisting of a full-control switch, a resonant capacitor and a resonant inductor 1 ～S 5 Zero-current on and zero-current off, freewheel switch tube S f2 And S is f4 Zero-current on and zero-current off, power switch tube S 5a And S is 4a Zero current on and zero current off, auxiliary power diode D a1 ～D a4 Zero current turn-off eliminates the reverse recovery problem of the diode, the inverter circuit can realize zero switching loss operation, so that the non-isolated inverter circuit breaks through the limitation of switching loss on switching frequency, the switching frequency is favorably improved, the miniaturization of passive elements and prototype integration are facilitated, the inverter circuit can realize zero switching loss operation of the power device, the current amplitude and the conduction loss of the main switching tube are not additionally increased, and the non-isolated inverter circuit is suitable for non-isolated inverter system application.
Meanwhile, the inverter circuit structure in the second embodiment of the invention can clamp the common-mode voltage at half of the input voltage, so that the inverter circuit has the function of eliminating the leakage current of the non-isolated inverter system.
Drawings
FIG. 1 is a schematic diagram of a conventional H5 inverter circuit;
fig. 2 is a schematic diagram of a non-isolated grid-connected inverter circuit according to a first embodiment of the present invention;
FIG. 3 is a timing diagram of a switch control according to a first embodiment of the present invention;
FIG. 4 is a diagram showing a theoretical operating waveform during a switching cycle according to an embodiment of the present invention;
FIG. 5 is a schematic view of a mode 1 according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a mode 2 according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a mode 3 according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a mode 4 according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a mode 5 according to an embodiment of the present invention;
FIG. 10 is a schematic view of a mode 6 according to an embodiment of the present invention;
FIG. 11 is a schematic view of a mode 7 according to an embodiment of the invention;
FIG. 12 is a schematic view of a mode 8 according to an embodiment of the present invention;
fig. 13 shows a fifth power switch tube S according to an embodiment of the invention 5 Is a working waveform diagram of (1);
fig. 14 shows a seventh power switch tube S according to an embodiment of the invention 5a Is a working waveform diagram of (1);
fig. 15 shows a first auxiliary power diode D according to an embodiment of the invention a1 Is a working waveform diagram of (1);
fig. 16 shows a third auxiliary power diode D according to an embodiment of the invention a3 Is a working waveform diagram of (1);
FIG. 17 is a fourth freewheel switch tube S according to an embodiment of the present invention f4 Is a working waveform diagram of (1);
fig. 18 is a schematic diagram of a non-isolated grid-connected inverter circuit according to a second embodiment of the present invention;
fig. 19 is a waveform diagram of a second common mode voltage simulation in accordance with an embodiment of the present invention.
Marked in the figure as:
C dc 、C dc1 、C dc2 -a bus capacitor, a first bus capacitor, a second bus capacitor;
S 1 ～S 5 、S 4a 、S 5a -a first power switching tube, a second power switching tube, a third power switching tube, a fourth power switching tube, a fifth power switching tube, a sixth power switching tube, a seventh power switching tube;
D 1 ～D 5 -the firstA power diode, a second power diode, a third power diode, a fourth power diode, a fifth power diode;
D a1 、D a2 、D a3 、D a4 -a first auxiliary power diode, a second auxiliary power diode, a third auxiliary power diode, a fourth auxiliary power diode;
S f2 、S f4 -a second freewheel switch tube, a fourth freewheel switch tube;
u g -grid voltage;
U PV -solar panel output voltage;
L 1 、L 2 、L a 、L a1 、L a2 -a first in-line filter inductance, a second in-line filter inductance, an intermediate inductance, a first intermediate inductance, a second intermediate inductance;
C f -an in-line filter capacitance.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Fig. 1 is a schematic diagram of an H5 inverter circuit, which is a hard switching operation, and fig. 2 is a circuit diagram of a first embodiment of a soft switching non-isolated grid-connected inverter circuit capable of operating with zero switching loss according to the present invention, including:
the bus capacitor group 1, the power switch, the follow current switch and the auxiliary resonant network 4;
the fifth power switch 25, the first power switch 21 and the second power switch 22 are sequentially connected in series and then are connected to two ends of the bus capacitor group 1;
the fifth power switch 25, the third power switch 23 and the fourth power switch 24 are sequentially connected in series and then are connected to two ends of the bus capacitor group 1;
the auxiliary resonant network 4 comprises a first auxiliary resonant unit connected to two ends of the fifth power switch 25, and the first auxiliary resonant unit passes through an intermediate inductor L a A second auxiliary resonance unit is connected to a node between the first power switch 21 and the second power switch 22 through a second follow current switch 32, the second auxiliary resonance unit is connected to a node between the third power switch 23 and the fourth power switch 24 through a fourth follow current switch 34, and the second auxiliary resonance unit is simultaneously connected to the bus capacitor bank;
first intake filter inductance L 1 Filter capacitor C of in-net f Second in-line filter inductor L 2 The two ends of the series connection are respectively connected with a node between the first power switch 21 and the second power switch 22 and a node between the third power switch 23 and the fourth power switch 24.
Output voltage U of solar panel PV And is connected in parallel with the bus capacitor bank.
The first power switch 21 comprises a first power switch tube S connected in parallel 1 And a first power diode D 1 ；
The second power switch 22 comprises a second power switch tube S connected in parallel 2 And a second power diode D 2 ；
The third power switch 23 comprises a third power switch tube S connected in parallel 3 And a third power diode D 3 ；
The fourth power switch 24 includes a fourth power switch tube S connected in parallel 4 And a fourth power diode D 4 ；
The fifth power switch 25 includes a fifth power switch tube S connected in parallel 5 And a fifth power diode D 5 。
The second freewheel switch 32 includes a second freewheel switch tube S f2 Second freewheel switch tube S f2 Connected in parallel with a diode;
the fourth freewheel switch 34 includes a fourth freewheel switch tube S f4 Fourth freewheel switch tube S f4 And a diodeAnd are connected in parallel.
The first auxiliary resonance unit comprises a first auxiliary power diode D a1 And a second auxiliary power diode D a2 First auxiliary power diode D a1 And a second auxiliary power diode D a2 The negative pole of the first auxiliary power diode D is connected to the nodes between the fifth power switch 25 and the first power switch 21 a1 And a second auxiliary power diode D a2 A first auxiliary capacitor C is connected between the positive electrodes of (C) a1 Seventh Power switch tube S 5a One end of the bus capacitor group is connected with one end of the seventh power switch tube S 5a Is connected to the other end of the first auxiliary power diode D a1 Is a positive electrode of (a); second auxiliary power diode D a2 Is connected to the intermediate inductance L a 。
The second auxiliary resonance unit comprises a third auxiliary power diode D a3 And a fourth auxiliary power diode D a4 Third auxiliary power diode D a3 The negative electrode of (2) passes through a second auxiliary capacitor C a2 Sixth power switching tube S 4a A third auxiliary power diode D connected to the other end of the bus capacitor group a3 The anode of the second follow current switch 32 and the fourth auxiliary power diode D are connected at the same time a4 A fourth auxiliary power diode D a4 Is connected to a sixth power switch tube S 4a Fourth auxiliary power diode D a4 The anode of the fourth follow current switch 34; third auxiliary power diode D a3 Is connected to the intermediate inductance L a 。
The bus capacitor group comprises a bus capacitor C dc 。
Fig. 3 is a schematic diagram of a first power switch tube S according to an embodiment of the present invention 1 And a fourth freewheel switching tube S f4 The current is always on in the positive half cycle and is always off in the negative half cycle of the network access current; third power switch tube S 3 And a second freewheel switching tube S f2 The current is always turned off in the positive half cycle and is always turned on in the negative half cycle of the network access current; second power switch tube S 2 The power supply is always turned off in the positive half cycle of the network access current, and high-frequency action is performed in the negative half cycle; fourth stepPower switch tube S 4 High-frequency action is performed in the positive half cycle of the network access current, and the power supply is always turned off in the negative half cycle; fifth power switch tube S 5 High-frequency action is performed in the whole power grid period; sixth power switching tube S 4a And a seventh power switching tube S 5a The high-frequency switch acts in the whole period. Sixth power switching tube S 4a And a seventh power switching tube S 5a Is delayed in turn on from the fifth power switch S 5 The on-time and the off-time are the same.
Fig. 4 is a theoretical operating waveform diagram of a high frequency switching period scale according to an embodiment of the present invention, and fig. 5 to 12 are equivalent operating mode diagrams of modes 1 to 8 in one switching period according to an embodiment of the present invention.
In the present embodiment, the solar panel outputs a voltage U PV =400V, grid voltage u g 220VRMS, grid frequency fg=50 Hz, rated power pn=1000w, bus capacitance C dc =470 μf; intake filter inductance l1=l2=0.5 mH; filter capacitance c1=2.2 μf; panel-to-ground parasitic capacitance cpv1=cpv2=0.15 μf; the switching frequency f=50 kHz, the resonance parameter lr=12 μ H, cr =47 nF.
As can be seen from the implementation results shown in fig. 13 to 17, the first power switching transistor S can be realized in the case that the circuit configuration shown in fig. 2 is matched with the switching control timing shown in fig. 3 1 Second power switch tube S 2 Third power switch tube S 3 Fourth power switching tube S 4 Fifth power switch tube S 5 Zero-current on and zero-current off, seventh power switching tube S 5a Sixth power switching tube S 4a Zero-current on and zero-current off of the first auxiliary power diode D a1 Second auxiliary power diode D a2 Third auxiliary power diode D a3 Fourth auxiliary power diode D a4 Zero current turn-off eliminates reverse recovery problems in the power diode.
Example two
Fig. 18 is a circuit diagram of a second embodiment of the present invention, a soft-switching non-isolated grid-connected inverter circuit capable of operating with zero switching loss, comprising:
a bus capacitor group, a power switch, a follow current switch and an auxiliary resonant network 4;
the fifth power switch 25, the first power switch 21 and the second power switch 22 are sequentially connected in series and then are connected to two ends of the bus capacitor group 1;
the fifth power switch 25, the third power switch 23 and the fourth power switch 24 are sequentially connected in series and then are connected to two ends of the bus capacitor group 1;
the auxiliary resonant network 4 comprises a first auxiliary resonant unit connected to two ends of the fifth power switch 25, and sequentially passing through a first intermediate inductor L a1 Second intermediate inductance L a2 A second auxiliary resonance unit is connected to a node between the first power switch 21 and the second power switch 22 through a second follow current switch 32, the second auxiliary resonance unit is connected to a node between the third power switch 23 and the fourth power switch 24 through a fourth follow current switch 34, and the second auxiliary resonance unit is simultaneously connected to the bus capacitor bank;
first intake filter inductance L 1 Filter capacitor C of in-net f Second in-line filter inductor L 2 The two ends of the series connection are respectively connected with a node between the first power switch 21 and the second power switch 22 and a node between the third power switch 23 and the fourth power switch 24.
The first power switch 21 comprises a first power switch tube S connected in parallel 1 And a first power diode D 1 ；
The second power switch 22 comprises a second power switch tube S connected in parallel 2 And a second power diode D 2 ；
The third power switch 23 comprises a third power switch tube S connected in parallel 3 And a third power diode D 3 ；
The fourth power switch 24 includes a fourth power switch tube S connected in parallel 4 And a fourth power diode D 4 ；
The fifth power switch 25 includes a fifth power switch tube S connected in parallel 5 And a fifth power diode D 5 。
The second freewheel switch 32 includes a second freewheel switch tube S f2 Second freewheel switch tube S f2 Connected in parallel with a diode;
the fourth freewheel switch 34 includes a fourth freewheel switch tube S f4 Fourth freewheel switch tube S f4 In parallel with a diode.
The first auxiliary resonance unit comprises a first auxiliary power diode D a1 And a second auxiliary power diode D a2 First auxiliary power diode D a1 And a second auxiliary power diode D a2 A first auxiliary power diode D connected to the fifth power switch 25 and a node between the first power switches 21 a1 And a second auxiliary power diode D a2 A first auxiliary capacitor C is connected between the positive electrodes of (C) a1 Seventh Power switch tube S 5a One end of the bus capacitor group is connected with one end of the seventh power switch tube S 5a Is connected to the other end of the first auxiliary power diode D a1 Is a positive electrode of (a); second auxiliary power diode D a2 Is connected to the intermediate inductance L a 。
The second auxiliary resonance unit comprises a third auxiliary power diode D a3 And a fourth auxiliary power diode D a4 Third auxiliary power diode D a3 The negative electrode of (2) passes through a second auxiliary capacitor C a2 Sixth power switching tube S 4a A third auxiliary power diode D connected to the other end of the bus capacitor group a3 The anode of the second follow current switch 32 and the fourth auxiliary power diode D are connected at the same time a4 A fourth auxiliary power diode D a4 Is connected to a sixth power switch tube S 4a Fourth auxiliary power diode D a4 The anode of the fourth follow current switch 34; third auxiliary power diode D a3 Is connected to the intermediate inductance L a 。
The bus capacitor group comprises two bus capacitors which are connected in series and are respectively a first bus capacitor C dc1 And a second bus capacitor C dc2 First intermediate inductance L a1 And a second intermediate inductance L a2 The node between is connected to the first bus capacitor C dc1 And a second bus capacitor C dc2 A node therebetween.
The second embodiment of the present invention provides a switch control timing sequence, a first power switch tube S 1 And a fourth freewheel switching tube S f4 The current is always on in the positive half cycle and is always off in the negative half cycle of the network access current; third power switch tube S 3 And a second freewheel switching tube S f2 The current is always turned off in the positive half cycle and is always turned on in the negative half cycle of the network access current; second power switch tube S 2 The power supply is always turned off in the positive half cycle of the network access current, and high-frequency action is performed in the negative half cycle; fourth power switch tube S 4 High-frequency action is performed in the positive half cycle of the network access current, and the power supply is always turned off in the negative half cycle; fifth power switch tube S 5 High-frequency action is performed in the whole power grid period; sixth power switching tube S 4a And a seventh power switching tube S 5a The high-frequency switch acts in the whole period. Sixth power switching tube S 4a And a seventh power switching tube S 5a Is delayed in turn on from the fifth power switch S 5 The on-time and the off-time are the same.
In the case where the circuit configuration shown in fig. 18 is matched with the switch control timing shown in fig. 3, the first power switching transistor S can be realized 1 Second power switch tube S 2 Third power switch tube S 3 Fourth power switching tube S 4 Fifth power switch tube S 5 Zero-current on and zero-current off, seventh power switching tube S 5a Sixth power switching tube S 4a Zero-current on and zero-current off of the first auxiliary power diode D a1 Second auxiliary power diode D a2 Third auxiliary power diode D a3 Fourth auxiliary power diode D a4 Zero current turn-off eliminates reverse recovery problems in the power diode. The simulated waveforms shown in fig. 19 illustrate that the clamping structure ensures that the common mode voltage of the inverter is at one half of the battery voltage during the power transfer, resonant and freewheeling phases.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (11)
1. A soft switching non-isolated grid-connected inverter circuit capable of running with zero switching loss is characterized in that: comprising the following steps:
the bus capacitor group (1), the power switch, the follow current switch and the auxiliary resonant network (4);
the fifth power switch (25), the first power switch (21) and the second power switch (22) are sequentially connected in series and then are connected to two ends of the bus capacitor group (1);
the fifth power switch (25), the third power switch (23) and the fourth power switch (24) are sequentially connected in series and then are connected to the two ends of the bus capacitor group (1);
the auxiliary resonant network (4) comprises a first auxiliary resonant unit, the first auxiliary resonant unit is connected to two ends of a fifth power switch (25), the first auxiliary resonant unit is connected with a second auxiliary resonant unit through an intermediate inductor, the second auxiliary resonant unit is connected to a node between the first power switch (21) and the second power switch (22) through a second follow current switch (32), the second auxiliary resonant unit is connected to a node between the third power switch (23) and the fourth power switch (24) through a fourth follow current switch (34), and the second auxiliary resonant unit is simultaneously connected to a bus capacitor bank;
first intake filter inductance (L) 1 ) Filter capacitor of in-line (C) f ) Second in-line filter inductor (L 2 ) And two ends of the two power switches are respectively connected with a node between the first power switch (21) and the second power switch (22) and a node between the third power switch (23) and the fourth power switch (24) after being sequentially connected in series.
2. A zero switching loss operation according to claim 1The soft switch non-isolated grid-connected inverter circuit is characterized in that: the first power switch (21) comprises a first power switch tube (S) 1 ) And a first power diode (D 1 ）。
3. A soft-switching non-isolated grid-connected inverter circuit operable with zero switching losses according to claim 1, wherein the second power switch (22) comprises a second power switch tube (S 2 ) And a second power diode (D 2 ）。
4. The soft-switching non-isolated grid-connected inverter circuit capable of zero-switching-loss operation of claim 1, wherein: the third power switch (23) comprises a third power switch tube (S) 3 ) And a third power diode (D 3 ）。
5. The soft-switching non-isolated grid-connected inverter circuit capable of zero-switching-loss operation of claim 1, wherein: the fourth power switch (24) comprises a fourth power switch tube (S) 4 ) And a fourth power diode (D 4 ）。
6. The soft-switching non-isolated grid-connected inverter circuit capable of zero-switching-loss operation of claim 1, wherein: the fifth power switch (25) comprises a fifth power switch tube (S) 5 ) And a fifth power diode (D 5 ）。
7. The soft-switching non-isolated grid-connected inverter circuit capable of zero-switching-loss operation of claim 1, wherein: the second freewheel switch (32) comprises a second freewheel switch tube (S) f2 ) Second freewheel switch tube (S) f2 ) Connected in parallel with a diode;
the fourth freewheel switch (34) includes a fourth freewheel switch tube (S) f4 ），Fourth freewheel switch tube (S) f4 ) In parallel with a diode.
8. The soft-switching non-isolated grid-connected inverter circuit capable of zero-switching-loss operation of claim 1, wherein: the first auxiliary resonance unit comprises a first auxiliary power diode (D a1 ) And a second auxiliary power diode (D a2 ) A first auxiliary power diode (D a1 ) And a second auxiliary power diode (D a2 ) Is connected to the fifth power switch (25), the node between the first power switches (21), the first auxiliary power diode (D a1 ) And a second auxiliary power diode (D a2 ) A first auxiliary capacitor (C) is connected between the positive electrodes a1 ) Seventh Power switch tube (S) 5a ) Is connected to one end of the bus capacitor group, a seventh power switch tube (S 5a ) Is connected to the other end of the first auxiliary power diode (D a1 ) Is a positive electrode of (a); second auxiliary power diode (D) a2 ) Is connected to the intermediate inductance.
9. The soft-switching non-isolated grid-connected inverter circuit capable of zero-switching-loss operation of claim 1, wherein: the second auxiliary resonance unit comprises a third auxiliary power diode (D a3 ) And a fourth auxiliary power diode (D a4 ) Third auxiliary power diode (D a3 ) Is connected with the negative electrode of the capacitor through a second auxiliary capacitor (C a2 ) Sixth power switch tube (S) 4a ) Is connected to the other end of the bus capacitor group, a third auxiliary power diode (D a3 ) The positive electrode of the first auxiliary power diode is connected with the second follow current switch (32) and the fourth auxiliary power diode (D) a4 ) A fourth auxiliary power diode (D a4 ) Is connected to the negative electrode of the sixth power switch tube (S 4a ) Fourth auxiliary power diode (D a4 ) The anode of the first follow current switch (34) is connected with the cathode of the second follow current switch; third auxiliary power diode (D) a3 ) Is connected to the intermediate inductance.
10. The soft-switching non-isolated grid-connected inverter circuit capable of zero-switching-loss operation of claim 1, wherein: the bus capacitor group comprises a bus capacitor.
11. The soft-switching non-isolated grid-connected inverter circuit capable of zero-switching-loss operation of claim 1, wherein: the bus capacitor group comprises two bus capacitors connected in series, which are respectively a first bus capacitor (C dc1 ) And a second bus capacitor (C dc2 ）；
The intermediate inductance comprises a first intermediate inductance (L a1 ) A second intermediate inductance (L a2 ）；
First intermediate inductance (L a1 ) And a second intermediate inductance (L a2 ) The node between is connected to a first bus capacitor (C dc1 ) And a second bus capacitor (C) dc2 ) A node therebetween.
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08308245A (en) * | 1995-03-03 | 1996-11-22 | Sanken Electric Co Ltd | Bridge type inverter |
| CN104242716A (en) * | 2014-08-07 | 2014-12-24 | 东南大学 | High-reliability non-switching-loss type non-isolated inverter and switching control time sequence thereof |
| CN104242719A (en) * | 2014-08-07 | 2014-12-24 | 东南大学 | Switching-loss-free full-bridge non-isolated photovoltaic grid-connected inverter and on-off control timing sequence |
| CN104753384A (en) * | 2015-03-19 | 2015-07-01 | 江苏大学 | Improved zero-current converting H6 structural non-isolation photovoltaic grid-connected inverter and control method thereof |
| CN105186914A (en) * | 2015-08-14 | 2015-12-23 | 安徽大学 | Novel H6 single-phase non-isolation grid-connected inverter |
| CN106533224A (en) * | 2016-12-08 | 2017-03-22 | 东北大学 | Novel resonant DC-link soft switching inverter and modulation method thereof |
| WO2017190007A1 (en) * | 2016-04-29 | 2017-11-02 | Massachusetts Institute Of Technology | Wide-operating-range resonant-transition soft-switched converter |
| CN109412446A (en) * | 2018-11-22 | 2019-03-01 | 东南大学 | Soft switching inverter circuit with constant common mode voltage |
| CN110011556A (en) * | 2019-05-13 | 2019-07-12 | 郑州大学 | A kind of non-isolated neutral-point-clamped photovoltaic combining inverter and its modulator approach |
| CN110198131A (en) * | 2019-06-06 | 2019-09-03 | 东南大学 | It is a kind of can total power factor operation without the non-isolated inverter of switching loss type |
| US20200052604A1 (en) * | 2018-08-13 | 2020-02-13 | University Of Central Florida Research Foundation, Inc. | Multi-input single-resonant tank llc converter |
| CN111900894A (en) * | 2020-06-17 | 2020-11-06 | 东南大学 | Zero-voltage conversion non-isolated grid-connected inverter capable of operating with full power factor and switch control time sequence thereof |
-
2023
- 2023-08-02 CN CN202310962717.3A patent/CN116683787B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08308245A (en) * | 1995-03-03 | 1996-11-22 | Sanken Electric Co Ltd | Bridge type inverter |
| CN104242716A (en) * | 2014-08-07 | 2014-12-24 | 东南大学 | High-reliability non-switching-loss type non-isolated inverter and switching control time sequence thereof |
| CN104242719A (en) * | 2014-08-07 | 2014-12-24 | 东南大学 | Switching-loss-free full-bridge non-isolated photovoltaic grid-connected inverter and on-off control timing sequence |
| CN104753384A (en) * | 2015-03-19 | 2015-07-01 | 江苏大学 | Improved zero-current converting H6 structural non-isolation photovoltaic grid-connected inverter and control method thereof |
| CN105186914A (en) * | 2015-08-14 | 2015-12-23 | 安徽大学 | Novel H6 single-phase non-isolation grid-connected inverter |
| WO2017190007A1 (en) * | 2016-04-29 | 2017-11-02 | Massachusetts Institute Of Technology | Wide-operating-range resonant-transition soft-switched converter |
| CN106533224A (en) * | 2016-12-08 | 2017-03-22 | 东北大学 | Novel resonant DC-link soft switching inverter and modulation method thereof |
| US20200052604A1 (en) * | 2018-08-13 | 2020-02-13 | University Of Central Florida Research Foundation, Inc. | Multi-input single-resonant tank llc converter |
| CN109412446A (en) * | 2018-11-22 | 2019-03-01 | 东南大学 | Soft switching inverter circuit with constant common mode voltage |
| CN110011556A (en) * | 2019-05-13 | 2019-07-12 | 郑州大学 | A kind of non-isolated neutral-point-clamped photovoltaic combining inverter and its modulator approach |
| CN110198131A (en) * | 2019-06-06 | 2019-09-03 | 东南大学 | It is a kind of can total power factor operation without the non-isolated inverter of switching loss type |
| CN111900894A (en) * | 2020-06-17 | 2020-11-06 | 东南大学 | Zero-voltage conversion non-isolated grid-connected inverter capable of operating with full power factor and switch control time sequence thereof |
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