CN101783608A - Minimum-voltage, active-clamp and three-phase grid-connected inverter - Google Patents
Minimum-voltage, active-clamp and three-phase grid-connected inverter Download PDFInfo
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- CN101783608A CN101783608A CN 201010125581 CN201010125581A CN101783608A CN 101783608 A CN101783608 A CN 101783608A CN 201010125581 CN201010125581 CN 201010125581 CN 201010125581 A CN201010125581 A CN 201010125581A CN 101783608 A CN101783608 A CN 101783608A
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- inverter
- voltage
- switch
- auxiliary switch
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Abstract
The invention discloses a minimum-voltage, active-clamp and three-phase grid-connected inverter, which comprises a DC inverter power supply, an AC filter inductor and a three-phase bridge arm. The three-phase bridge arm consists of 6 full-control master switches with anti-parallel diodes, an auxiliary switch with an anti-parallel diode is connected between the DC inverter power supply and the DC bus of the three-phase bridge arm, the two ends of the master switches and the auxiliary switch are all connected with a capacitor in parallel, and the two ends of the auxiliary switch are bridged with a resonance branch formed by serial connection of a resonance inductor and a clamp capacitor. The inverter of the invention has simple structure and adopts an improved space vector modulation method. When the power-factor angle of the grid-connected current of the inverter is between minus 30 degrees and plus 30 degrees , the zero-voltage switching-on of all the master switches can be realized through one action of the auxiliary switch in each switching period, the reverse recovery current of the anti-parallel diodes of the master switches are inhibited, and the switch voltage stress is equal to the voltage of the DC inverter power supply. Moreover, due to the low switching loss and high circuit efficiency, the invention facilitates the improvement of the operating frequency, thereby enhancing the power density.
Description
Technical field
The present invention relates to inverter, especially minimum-voltage, active-clamp and three-phase grid-connected inverter.
Background technology
Three-phase inverter with the operation function that generates electricity by way of merging two or more grid systems, its circuit as shown in Figure 1, it comprises the full control main switch (S that the inverse parallel diode is arranged by six
1～S
6) the three-phase brachium pontis that constitutes, be connected on the output inductor (L between each phase brachium pontis mid point and the AC network respectively
a～L
c).This three-phase inverter can be realized the function of generating electricity by way of merging two or more grid systems, but circuit working exists the reverse-recovery problems of diode at the hard switching state, and the devices switch loss is big, has limited the raising of operating frequency, has reduced circuit efficiency and has had bigger electromagnetic interference.
Summary of the invention
The purpose of this invention is to provide a kind of reverse recovery current that can suppress diode, reduce switching loss, improve circuit efficiency, reduce electromagnetic interference and realize the minimum-voltage, active-clamp and three-phase grid-connected inverter that switch tube zero voltage is opened.
Minimum-voltage, active-clamp and three-phase grid-connected inverter of the present invention comprises inverter direct-flow side power supply V
DcThe three-phase brachium pontis that constitutes by six full control main switches that the inverse parallel diode arranged, be connected on the output inductor between each phase brachium pontis mid point and the AC network respectively, it is characterized in that six main switches difference shunt capacitances of three-phase brachium pontis, at inverter direct-flow side power supply V
DcAnd have access to the auxiliary switch of inverse parallel diode between the dc bus of three-phase brachium pontis, the two ends shunt capacitance of auxiliary switch, and the resonance branch road that is in series by resonant inductance and clamping capacitance in the cross-over connection of auxiliary switch two ends.
Minimum-voltage, active-clamp and three-phase grid-connected inverter of the present invention is simple in structure, and the reverse recovery of the inverse parallel diode of full control switch is inhibited in the inverter, has reduced electromagnetic interference.All device for power switching realize that no-voltage is open-minded in the circuit, thereby reduce switching loss, improve circuit efficiency, help improving operating frequency, and then improve power density.The circuit of this inverter can be realized the control of output grid-connected current power factor and harmonic wave be can be used for parallel network reverse device in the various power supplys.
Description of drawings
Fig. 1 is existing three-phase grid-connected inverter;
Fig. 2 is a kind of physical circuit figure of the present invention;
Fig. 3 is second kind of physical circuit figure of the present invention;
Fig. 4 is the third physical circuit figure of the present invention;
Fig. 5 is the 4th kind of physical circuit figure of the present invention;
Fig. 6 is that the line voltage and the electric current of 12 work sectors in the power frequency period divided schematic diagram;
Fig. 7 is the line voltage three dimensional vector diagram of 12 work sectors in the power frequency period;
Fig. 8 is the pulse control timing figure of inverter switch in sector 2;
Main voltage and current waveform when Fig. 9 is a circuit working of the present invention.
Embodiment
With reference to Fig. 2, minimum-voltage, active-clamp and three-phase grid-connected inverter of the present invention comprises inverter direct-flow side power supply V
Dc, by six full control main switch S that the inverse parallel diode is arranged
1～S
6The three-phase brachium pontis that constitutes is connected on the output inductor L between each phase brachium pontis mid point and the AC network respectively
a～L
c, it is characterized in that six main switch S of three-phase brachium pontis
1～S
6Difference shunt capacitance C
1～C
6, at inverter direct-flow side power supply V
DcAnd have access to the auxiliary switch S of inverse parallel diode between the dc bus of three-phase brachium pontis
7, auxiliary switch S
7Two ends shunt capacitance C
7, and at auxiliary switch S
7The two ends cross-over connection is by resonant inductance L
rWith clamping capacitance C
cThe resonance branch road that is in series.
In the instantiation shown in Figure 2, auxiliary switch S
7Collector electrode and inverter direct-current power supply anode link, and emitter and three-phase brachium pontis positive bus-bar link resonant inductance L
rLink clamping capacitance C with three-phase brachium pontis positive bus-bar
cLink with the inverter direct-current power supply anode.In the example shown in Figure 3, auxiliary switch S
7Collector electrode and inverter direct-current power supply anode link, and emitter and three-phase brachium pontis positive bus-bar link clamping capacitance C
cLink resonant inductance L with three-phase brachium pontis positive bus-bar
rLink with the inverter direct-current power supply anode.In the example shown in Figure 4, auxiliary switch S
7Emitter and inverter direct-current power supply negative terminal link, and collector electrode and three-phase brachium pontis negative busbar link clamping capacitance C
cLink resonant inductance L with three-phase brachium pontis negative busbar
rLink with the inverter direct-current power supply negative terminal.In the example shown in Figure 5, auxiliary switch S
7Emitter and inverter direct-current power supply negative terminal link, and collector electrode and three-phase brachium pontis negative busbar link resonant inductance L
rLink clamping capacitance C with three-phase brachium pontis negative busbar
cLink with the inverter direct-current power supply negative terminal.
Minimum-voltage, active-clamp and three-phase grid-connected inverter adopts space vector control.In a line voltage power frequency period, the control of inverter can be divided into 12 sectors, and line voltage and electric current sector are divided as shown in Figure 6.A phase line voltage u among Fig. 6
SaCosine wave is voltage sector 2 at 0 ° to 30 °, A phase line voltage u
SaCosine wave is voltage sector 3 at 30 ° to 60 °, and the rest may be inferred, A phase line voltage u
SaCosine wave is voltage sector 12 at 300 ° to 330 °, A phase grid-connected current i
aCosine wave is electric current sector 2 at 0 ° to 30 °, A phase grid-connected current i
aCosine wave is electric current sector 3 at 30 ° to 60 °, and the rest may be inferred, A phase grid-connected current i
aCosine wave is electric current sector 12 at 300 ° to 330 °.Figure 7 shows that the line voltage three dimensional vector diagram, among the figure
Arrive
Expression inverter switching device vector, the switch vector
Expression inverter main switch S
2, S
4, S
6Conducting, inverter main switch S
1, S
3, S
5End the switch vector
Expression inverter main switch S
1, S
2, S
6Conducting, inverter main switch S
3, S
4, S
5End, the rest may be inferred, the switch vector
Expression inverter main switch S
1, S
3, S
5Conducting, inverter main switch S
2, S
4, S
6End.The inverter switching device vector
With
The expression zero vector, the inverter switching device vector
With
Represent non-zero vector.The switching pulse control timing of inverter grid-connected current when different line voltage sectors is as shown in table 1, when table 1 corresponding different line voltages sector of expression and grid-connected current sector, and inverter main switch vector transfer sequence.
Table 1
The minimum-voltage, active-clamp inverter adopts special space vector modulation strategy, and each line voltage power frequency period is divided into 12 space vector sectors, guarantees that in each sub-sector a cross streams grid-connected current absolute value keeps maximum.Flow through the not change of current of brachium pontis switch of electric current absolute value maximal phase, if output inductor electric current absolute value maximal phase direction for just, then zero vector is
If electric current absolute value maximal phase direction is for negative, then zero vector is
The transfer sequence of space vector is guaranteed to exist twice change of current of diode reverse recovery to align in time in inverter is incorporated into the power networks the switch change of current of the less two-phase of instantaneous output current absolute value, then auxiliary circuit only need be created a busbar voltage resonance to zero chance, just can realize that the no-voltage of two switches is open-minded.In the time of between positive and negative 30 ° of inverter grid-connected current power-factor angle, the inverter no-voltage is opened all and can be realized.Six main switch S in the inverter
1～S
6With auxiliary switch S
7Space vector PWM controller by fixed switching frequency is controlled, auxiliary switch S
7Switching frequency and full control main switch S
1～S
6Switching frequency identical, auxiliary switch S
7Only at inverter main switch S
1～S
6Switch to from zero vector in of short duration period of non-zero vector and turn-off.
For minimum-voltage, active-clamp and three-phase grid-connected inverter, in 12 sectors of a power frequency period of grid-connected current, inverter control is similar, here be that example is analyzed just with a minimum-voltage, active-clamp and three-phase grid-connected inverter shown in Figure 2 switch periods in grid-connected current sector 2, if inverter grid-connected current power-factor angle is 0 °, line voltage does not have phase angle difference with corresponding grid-connected current mutually, and the pulse control timing of inverter switch in sector 2 as shown in Figure 8.In work period, inverter has 8 operating states at a switch.Main voltage and current waveform during work as shown in Figure 9.
Stage 1 (t
0-t
1):
Main switch S
1, S
3, S
5With auxiliary switch S
7Be in conducting state.By resonant inductance L
r, clamping capacitance C
cWith auxiliary switch S
7In the resonant tank of forming, the electric current of resonant inductance Lr increases in linearity.
Stages 2 (t
1-t
2):
t
1Constantly, auxiliary switch S
7Turn-off resonant inductance L
rGive main switch S
2, S
4, S
6Shunt capacitance C
2, C
4, C
6Auxiliary switch S is given in discharge
7Shunt capacitance C
7Charging, S
7No-voltage is turn-offed.To t
2Constantly, three main switch S
2, S
4, S
6Shunt capacitance C
2, C
4, C
6Voltage resonance arrives zero, main switch S
2, S
4, S
6The inverse parallel diode begin conducting, resonant inductance L
rVoltage is inverter power supply supply voltage V by clamp
DcTo t
2Constantly, resonant inductance L
rWith main switch S
2, S
4, S
6Shunt capacitance C
2, C
4, C
6, auxiliary switch S
7Shunt capacitance C
7Resonance is finished, main switch S
2, S
6Can realize that no-voltage is open-minded.
Stages 3 (t
2-t
3):
In this stage, main switch S
3And S
5Anti-and diode experience reversely restoring process because resonant inductance L
rExistence, main switch S
3And S
5Anti-and diode reverse recovery current be suppressed.To t3 constantly, main switch S
3And S
5Anti-and diode current vanishing.
Stages 4 (t
3-t
4):
The t3 moment, main switch S
3And S
5Anti-and diode turn-off resonant inductance L
rBeginning and main switch S
3, S
4, S
5Shunt capacitance C
3, C
4, C
5, auxiliary switch S
7Shunt capacitance C
7Resonance, main switch S
3, S
4, S
5The two ends capacitor C
3, C
4, C
5Voltage begins to increase auxiliary switch S
7Two ends shunt capacitance C
7Voltage reduces, to t4 constantly, and S
7Two ends shunt capacitance C
7Voltage is reduced to zero, S
7Anti-also diode current flow, S
7The realization no-voltage is open-minded.
Stages 5 (t
4-t
5):
To t
4Constantly, circuit enters switch vector 100 states, main switch S
1, S
6, S
2With auxiliary switch S
7Conducting.By resonant inductance L
r, clamping capacitance C
cWith auxiliary switch S
7In the closed-loop path of forming, the electric current of resonant inductance Lr increases in linearity.
Stages 6 (t
5-t
6):
To t5 constantly, main switch S
6Turn-off filter inductance L
bIn electric current give main switch S
6Shunt capacitance C
6Main switch S is given in charging
3Shunt capacitance C
3Discharge is because S
6The existence of shunt capacitance, S
6The realization no-voltage is turn-offed.
Stages 7 (t
6-t
7):
To t6 constantly, circuit enters switch vector 110 states, main switch S
1, S
3, S
2With auxiliary switch S
7Conducting.By resonant inductance L
r, clamping capacitance C
cWith auxiliary switch S
7In the closed-loop path of forming, the electric current of resonant inductance Lr increases in linearity.
Stages 8 (t
7-t
8):
To t7 constantly, main switch S
2Turn-off filter inductance L
cIn electric current give main switch S
2Shunt capacitance C
2Main switch S is given in charging
5Shunt capacitance C
5Discharge is because S
2The existence of shunt capacitance, S
2The realization no-voltage is turn-offed.To t8 constantly, S
2Turn-off main switch S
5Body in diode current flow, overlap with the stage 1.Circuit repeats next cycle.
Claims (1)
1. minimum-voltage, active-clamp and three-phase grid-connected inverter comprises inverter direct-flow side power supply V
Dc, by six full control main switch (S that the inverse parallel diode is arranged
1～S
6) the three-phase brachium pontis that constitutes, be connected on the output inductor (L between each phase brachium pontis mid point and the AC network respectively
a～L
c), it is characterized in that six main switch (S of three-phase brachium pontis
1～S
6) difference shunt capacitance (C
1～C
6), at inverter direct-flow side power supply V
DcAnd have access to the auxiliary switch (S of inverse parallel diode between the dc bus of three-phase brachium pontis
7), auxiliary switch (S
7) two ends shunt capacitance (C
7), and at auxiliary switch (S
7) the two ends cross-over connection is by resonant inductance (L
r) and clamping capacitance (C
c) the resonance branch road that is in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010125581 CN101783608A (en) | 2010-03-16 | 2010-03-16 | Minimum-voltage, active-clamp and three-phase grid-connected inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010125581 CN101783608A (en) | 2010-03-16 | 2010-03-16 | Minimum-voltage, active-clamp and three-phase grid-connected inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101783608A true CN101783608A (en) | 2010-07-21 |
Family
ID=42523458
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010125581 Pending CN101783608A (en) | 2010-03-16 | 2010-03-16 | Minimum-voltage, active-clamp and three-phase grid-connected inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101783608A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594176A (en) * | 2011-01-21 | 2012-07-18 | 浙江大学 | Soft-switch three-phase PWM rectifier with auxiliary free-wheel channel |
| CN104831513A (en) * | 2014-12-12 | 2015-08-12 | 武汉绿鼎天舒科技发展有限公司 | Efficient electric iron |
| EP2871767A3 (en) * | 2013-11-12 | 2015-12-23 | Control Techniques Ltd | Modulation of Switching Signals in Power Inverters |
| CN106685249A (en) * | 2017-01-03 | 2017-05-17 | 浙江大学 | Zero voltage switch modulation method of three-phase four-wire system zero voltage switch inverter |
| CN107707139A (en) * | 2016-08-08 | 2018-02-16 | 维谛技术有限公司 | A kind of control method and device with the circuit for switching bridge arm |
| CN109861573A (en) * | 2019-03-07 | 2019-06-07 | 苏州赛得尔智能科技有限公司 | A kind of low switching losses power inverter |
| CN111865067A (en) * | 2020-07-17 | 2020-10-30 | 浙江大学 | Control method for power factor correction circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1257617A (en) * | 1997-05-21 | 2000-06-21 | Apc丹麦公司 | Method and circuit for resonance inversion |
| CN1635696A (en) * | 2004-12-27 | 2005-07-06 | 浙江大学 | Minimum voltage active clamping three-phase AC-DC power factor correction converter |
| US20070211507A1 (en) * | 2006-03-03 | 2007-09-13 | Milan Ilic | Interleaved soft switching bridge power converter |
-
2010
- 2010-03-16 CN CN 201010125581 patent/CN101783608A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1257617A (en) * | 1997-05-21 | 2000-06-21 | Apc丹麦公司 | Method and circuit for resonance inversion |
| CN1635696A (en) * | 2004-12-27 | 2005-07-06 | 浙江大学 | Minimum voltage active clamping three-phase AC-DC power factor correction converter |
| US20070211507A1 (en) * | 2006-03-03 | 2007-09-13 | Milan Ilic | Interleaved soft switching bridge power converter |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594176A (en) * | 2011-01-21 | 2012-07-18 | 浙江大学 | Soft-switch three-phase PWM rectifier with auxiliary free-wheel channel |
| EP2871767A3 (en) * | 2013-11-12 | 2015-12-23 | Control Techniques Ltd | Modulation of Switching Signals in Power Inverters |
| CN104831513A (en) * | 2014-12-12 | 2015-08-12 | 武汉绿鼎天舒科技发展有限公司 | Efficient electric iron |
| CN107707139A (en) * | 2016-08-08 | 2018-02-16 | 维谛技术有限公司 | A kind of control method and device with the circuit for switching bridge arm |
| US10601303B2 (en) | 2016-08-08 | 2020-03-24 | Vertiv Tech Co., Ltd. | Control method and device for circuit with a bridge arm of a switch |
| CN107707139B (en) * | 2016-08-08 | 2020-05-01 | 维谛技术有限公司 | Control method and device for circuit with switch bridge arm |
| CN106685249A (en) * | 2017-01-03 | 2017-05-17 | 浙江大学 | Zero voltage switch modulation method of three-phase four-wire system zero voltage switch inverter |
| CN106685249B (en) * | 2017-01-03 | 2019-03-12 | 浙江大学 | A kind of zero voltage switch modulator approach of three-phase four-wire system zero voltage switch inverter |
| CN109861573A (en) * | 2019-03-07 | 2019-06-07 | 苏州赛得尔智能科技有限公司 | A kind of low switching losses power inverter |
| CN111865067A (en) * | 2020-07-17 | 2020-10-30 | 浙江大学 | Control method for power factor correction circuit |
| CN111865067B (en) * | 2020-07-17 | 2021-06-11 | 浙江大学 | Control method for power factor correction circuit |
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Application publication date: 20100721 |