CN103219912B - Control method suitable for universal input voltage buck-boost grid-connected inverter - Google Patents
Control method suitable for universal input voltage buck-boost grid-connected inverter Download PDFInfo
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- CN103219912B CN103219912B CN201310157818.XA CN201310157818A CN103219912B CN 103219912 B CN103219912 B CN 103219912B CN 201310157818 A CN201310157818 A CN 201310157818A CN 103219912 B CN103219912 B CN 103219912B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005070 sampling Methods 0.000 claims description 27
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- 230000001939 inductive effect Effects 0.000 claims description 10
- 230000006837 decompression Effects 0.000 claims description 9
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 5
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Abstract
The invention discloses a control method suitable for a universal input voltage buck-boost grid-connected inverter and belongs to an inverter control method. According to the method, an input voltage feedback signal is subjected to given comparison with switching voltage to output a gating switch control signal, when the gating switch control signal is at a low level, the universal input voltage buck-boost grid-connected inverter works in a buck-boost mode, a first power switching tube, a second power switching tube, a fifth power switching tube and a sixth power switching tube are turned on and off at high frequency within a half power frequency period, and a third power switching tube and a fourth power switching tube are turned on and off at high frequency within the whole power frequency period; and when the gating switch control signal is at a high level, the universal input voltage buck-boost grid-connected inverter works in a step-down mode, the first power switching tube, the second power switching tube, the third power switching tube and the fourth power switching tube are turned on and off at the power frequency, and the fifth power switching tube and the sixth power switching tube are turned on and off at high frequency within the half power frequency period. The method is suitable for the grid-connected inverter with universal input voltage and buck-boost conversion, the weight and the size of a filter inductor are reduced, the voltage and current stresses of the power switching tubes are reduced, the conversion efficiency is improved, the cost is reduced, the problem of direct connection of the power switching tubes of the bridge-type inverter bridge arm is solved, and the reliability is improved.
Description
Technical field
The present invention relates to a kind of control method of inverter, relate in particular to a kind of control method of applicable wide input voltage buck-boost grid-connected inverter.
Background technology
In recent years, along with increasingly sharpening and fossil energy constantly in short supply of environmental pollution, regenerative resource more and more receives people's concern owing to having clean and safe, the advantage such as pollution-free, renewable.Solar cell and fuel cell etc. are output as direct current, and line voltage is alternating current, and therefore, combining inverter becomes the important component part in distributed generation system.Because the output voltage range of solar cell and fuel cell etc. is wide, as 200～500V, sometimes lower than line voltage, sometimes higher than line voltage, therefore, adopt traditional single-stage buck formula combining inverter to realize, conventionally need to add again a preceding stage DC-DC converter, thereby the complexity that has improved system, has reduced reliability, increased the cost of system.Open (CN102005962B) buck-boost grid-connected inverter and control method thereof can realize buck conversion.But the control method of carrying can only be operated in buck pattern; Have 2 power switch pipes HF switch in whole power frequency period, have 4 power switch pipes HF switch in half power frequency period, switching loss is higher; The voltage stress that has 2 power switch pipes is input voltage and inverter self output voltage sum, if input voltage is 500V, inverter self output voltage peak value is 311V, and the voltage that power switch pipe bears is 811V, and so the HF switch metal-oxide-semiconductor of high voltage stress is difficult to choose.
Summary of the invention
The object of the invention is to the defect for traditional buck-boost grid-connected inverter control method, propose a kind of control method that is applicable to wide input buck-boost grid-connected inverter.
The present invention is applicable to the control method of wide input voltage buck-boost grid-connected inverter, and the electric current output that described control method adopts current sampling circuit sampling to be applicable to the first filter inductance of wide input voltage buck-boost grid-connected inverter is applicable to the first filter inductance current feedback signal of wide input voltage buck-boost grid-connected inverter; The electric current output that adopts current sampling circuit sampling to be applicable to the second filter inductance of wide input voltage buck-boost grid-connected inverter is applicable to the second filter inductance current feedback signal of wide input voltage buck-boost grid-connected inverter; The grid current output that adopts current sampling circuit sampling to be applicable to wide input voltage buck-boost grid-connected inverter is applicable to the grid current feedback signal of wide input voltage buck-boost grid-connected inverter; The line voltage grid current same frequently with the line voltage that is applicable to wide input voltage buck-boost grid-connected inverter by the output of synchronized module, homophase that the sampling of employing voltage sampling circuit is applicable to wide input voltage buck-boost grid-connected inverter is given; The grid current feedback signal of the given and applicable wide input voltage buck-boost grid-connected inverter of described grid current is passed through to grid current adjuster outputting inductance given value of current; The first filter inductance current feedback signal of the given and applicable wide input voltage buck-boost grid-connected inverter of described inductive current is exported to the first switching logic signal by the first hysteresis current comparator; The second filter inductance current feedback signal of the given and applicable wide input voltage buck-boost grid-connected inverter of described inductive current is exported to second switch logical signal by the second hysteresis current comparator; By described inductive current given with zero potential by the first comparator output the 3rd switching logic signal; Described the 3rd switching logic signal is exported to the 4th switching logic signal by the first inverter; Described the first switching logic signal and the 4th switching logic signal are exported to the 5th switching logic signal by first with door; By described the first switching logic signal, by being applicable to the switching logic signal of five power switch pipe of wide input voltage buck-boost grid-connected inverter by second with door output with the 4th switching logic signal after the second inverter, the switching logic signal of the 5th power switch pipe of described applicable wide input voltage buck-boost grid-connected inverter drives the 5th power switch pipe that is applicable to wide input voltage buck-boost grid-connected inverter by the 5th drive circuit; Described second switch logical signal and the 3rd switching logic signal are applicable to the switching logic signal of the 6th power switch pipe of wide input voltage buck-boost grid-connected inverter by the 3rd with door output, and the switching logic signal of the 6th power switch pipe of described applicable wide input voltage buck-boost grid-connected inverter drives the 6th power switch pipe that is applicable to wide input voltage buck-boost grid-connected inverter by the 6th drive circuit; Described second switch logical signal is exported to a 6th switching logic signal by passing through the 4th with the 3rd switching logic signal after the 3rd inverter with door;
The supply voltage output that adopts voltage sensor sampling to be applicable to wide input voltage buck-boost grid-connected inverter is applicable to the supply voltage feedback signal of wide input voltage buck-boost grid-connected inverter; By the supply voltage feedback signal of described applicable wide input voltage buck-boost grid-connected inverter and the given second comparator output gating switch control signal of passing through of switched voltage;
When applicable wide input voltage buck-boost grid-connected inverter is in buck pattern, described gating switch control signal is low level, gating switch 0 passage gating, drives by passing through the first drive circuit after the first gating switch the first power switch pipe that is applicable to wide input voltage buck-boost grid-connected inverter by described the 5th switching logic signal; Described the 6th switching logic signal is driven to the second power switch pipe that is applicable to wide input voltage buck-boost grid-connected inverter by passing through the second drive circuit after the second gating switch; By the switching logic signal of the 5th power switch pipe of described the 6th switching logic signal and applicable wide input voltage buck-boost grid-connected inverter successively by first or door, the 3rd gating switch, the 3rd drive circuit drive the 3rd power switch pipe of applicable wide input voltage buck-boost grid-connected inverter; By the switching logic signal of the 6th power switch pipe of described the 5th switching logic signal and applicable wide input voltage buck-boost grid-connected inverter successively by second or the 4th power switch pipe of the applicable wide input voltage buck-boost grid-connected inverter of the moving drives of door, the 4th gating switch, 4 wheel driven;
When applicable wide input voltage buck-boost grid-connected inverter is in decompression mode, described gating switch control signal is high level, gating switch 1 passage gating, drives by passing through the first drive circuit after the first gating switch the first power switch pipe that is applicable to wide input voltage buck-boost grid-connected inverter by described the 4th switching logic signal; Described the 3rd switching logic signal is driven to the second power switch pipe that is applicable to wide input voltage buck-boost grid-connected inverter by passing through the second drive circuit after the second gating switch; Described the 3rd switching logic signal is driven to the 3rd power switch pipe that is applicable to wide input voltage buck-boost grid-connected inverter by passing through the 3rd drive circuit after the 3rd gating switch; Described the 4th switching logic signal is applicable to the 4th power switch pipe of wide input voltage buck-boost grid-connected inverter by passing through the moving drives of 4 wheel driven after the 4th gating switch.
The present invention with the beneficial effect of the control method contrast of open (CN102005962B) buck-boost grid-connected inverter is:
1) be applicable to the occasion of the wide input voltages such as solar cell, fuel cell;
2) when high-line input voltage, be applicable to wide input voltage buck-boost grid-connected inverter in decompression mode, 4 power switch pipe power frequency switches, only have 2 power switch pipes HF switch in half power frequency period, have reduced switching loss, have improved conversion efficiency;
3) under decompression mode, inductive current and flow through under the current ratio buck pattern of power switch pipe little, thereby reduced the weight and volume of filter inductance, reduced the current stress of power switch pipe, the power switch pipe that can select low current stress, has reduced cost;
4) under decompression mode, little under the voltage ratio buck pattern that power switch pipe bears, can select the power switch pipe of low voltage stress, thereby reduce cost, reduced the conducting resistance of power switch pipe, reduced conduction loss, improved conversion efficiency.
Accompanying drawing explanation
Fig. 1: control system block diagram of the present invention;
Fig. 2: the operating circuit schematic diagram under buck pattern of the present invention during mode 1;
Fig. 3: the operating circuit schematic diagram under buck pattern of the present invention during mode 2;
Fig. 4: the operating circuit schematic diagram under buck pattern of the present invention during mode 3;
Fig. 5: the operating circuit schematic diagram under buck pattern of the present invention during mode 4;
Fig. 6: the operating circuit schematic diagram under decompression mode of the present invention during mode 1;
Fig. 7: the operating circuit schematic diagram under decompression mode of the present invention during mode 3.
Main designation in figure: U
in---supply voltage, S
1～S
6---power switch pipe, D
1～D
4---diode, L
1, L
2---filter inductance, L
g---net side filter inductance, C
f---filter capacitor, R
d---damping resistance, u
g---line voltage, u
o---inverter self output voltage, i
g---grid current, i
l1, i
l2---filter inductance L
1and L
2electric current, U
ref---switched voltage is given, U
c---gating switch control signal.
Embodiment
As shown in Figure 1, be applicable to wide input voltage buck-boost grid-connected inverter and comprise power supply U
in, the first power switch tube S
1, the second power switch tube S
2, the 3rd power switch tube S
3, the 4th power switch tube S
4, the 5th power switch tube S
5, the 6th power switch tube S
6, the first diode D
1, the second diode D
2, the 3rd diode D
3, the 4th diode D
4, damping resistance R
d, filter capacitor C
f, net side filter inductance L
g, the first filter inductance L
1, the second filter inductance L
2and electrical network;
Control method is as follows: adopt current sampling circuit sampling to be applicable to the first filter inductance L of wide input voltage buck-boost grid-connected inverter
1current i
l1output is applicable to the first filter inductance L of wide input voltage buck-boost grid-connected inverter
1current feedback signal i
lf1; Adopt current sampling circuit sampling to be applicable to the second filter inductance L of wide input voltage buck-boost grid-connected inverter
2current i
l2output is applicable to the second filter inductance L of wide input voltage buck-boost grid-connected inverter
2current feedback signal i
lf2; Adopt current sampling circuit sampling to be applicable to the grid current i of wide input voltage buck-boost grid-connected inverter
goutput is applicable to the grid current feedback signal i of wide input voltage buck-boost grid-connected inverter
gf; Adopt voltage sampling circuit sampling to be applicable to the line voltage u of wide input voltage buck-boost grid-connected inverter
gby the output of synchronized module and the line voltage u that is applicable to wide input voltage buck-boost grid-connected inverter
gthe given i of grid current with frequency, homophase
gref; By the given i of described grid current
grefgrid current feedback signal i with applicable wide input voltage buck-boost grid-connected inverter
gfby grid current adjuster outputting inductance given value of current i
lref; By the given i of described inductive current
lrefthe first filter inductance L with applicable wide input voltage buck-boost grid-connected inverter
1current feedback signal i
lf1by the first hysteresis current comparator, export the first switching logic signal; By the given i of described inductive current
lrefthe second filter inductance L with applicable wide input voltage buck-boost grid-connected inverter
2current feedback signal i
lf2by the second hysteresis current comparator output second switch logical signal; By the given i of described inductive current
lrefby the first comparator, export the 3rd switching logic signal with zero potential; Described the 3rd switching logic signal is exported to the 4th switching logic signal by the first inverter; Described the first switching logic signal and the 4th switching logic signal are exported to the 5th switching logic signal by first with door; Described the first switching logic signal is exported to the 5th power switch tube S that is applicable to wide input voltage buck-boost grid-connected inverter by passing through second with the 4th switching logic signal after the second inverter with door
5switching logic signal, the 5th power switch tube S of described applicable wide input voltage buck-boost grid-connected inverter
5switching logic signal by the 5th drive circuit, drive to be applicable to the 5th power switch tube S of wide input voltage buck-boost grid-connected inverter
5; Described second switch logical signal and the 3rd switching logic signal are exported to the 6th power switch tube S that is applicable to wide input voltage buck-boost grid-connected inverter by the 3rd with door
6switching logic signal, the 6th power switch tube S of described applicable wide input voltage buck-boost grid-connected inverter
6switching logic signal by the 6th drive circuit, drive to be applicable to the 6th power switch tube S of wide input voltage buck-boost grid-connected inverter
6; Described second switch logical signal is exported to a 6th switching logic signal by passing through the 4th with the 3rd switching logic signal after the 3rd inverter with door;
Adopt voltage sensor sampling to be applicable to the supply voltage U of wide input voltage buck-boost grid-connected inverter
inoutput is applicable to the supply voltage feedback signal U of wide input voltage buck-boost grid-connected inverter
inf; By the supply voltage feedback signal U of described applicable wide input voltage buck-boost grid-connected inverter
infwith the given U of switched voltage
refby the second comparator output gating switch control signal U
c;
When applicable wide input voltage buck-boost grid-connected inverter is in buck pattern, described gating switch control signal U
cfor low level, gating switch 0 passage gating, drives by passing through the first drive circuit after the first gating switch the first power switch tube S that is applicable to wide input voltage buck-boost grid-connected inverter by described the 5th switching logic signal
1; Described the 6th switching logic signal is driven to the second power switch tube S that is applicable to wide input voltage buck-boost grid-connected inverter by passing through the second drive circuit after the second gating switch
2; By the 5th power switch tube S of described the 6th switching logic signal and applicable wide input voltage buck-boost grid-connected inverter
5switching logic signal successively by first or door, the 3rd gating switch, the 3rd drive circuit drive the 3rd power switch tube S of applicable wide input voltage buck-boost grid-connected inverter
3; By the 6th power switch tube S of described the 5th switching logic signal and applicable wide input voltage buck-boost grid-connected inverter
6switching logic signal successively by second or the 4th power switch tube S of the applicable wide input voltage buck-boost grid-connected inverter of the moving drives of door, the 4th gating switch, 4 wheel driven
4;
When applicable wide input voltage buck-boost grid-connected inverter is in decompression mode, described gating switch control signal U
cfor high level, gating switch 1 passage gating, drives by passing through the first drive circuit after the first gating switch the first power switch tube S that is applicable to wide input voltage buck-boost grid-connected inverter by described the 4th switching logic signal
1; Described the 3rd switching logic signal is driven to the second power switch tube S that is applicable to wide input voltage buck-boost grid-connected inverter by passing through the second drive circuit after the second gating switch
2; Described the 3rd switching logic signal is driven to the 3rd power switch tube S that is applicable to wide input voltage buck-boost grid-connected inverter by passing through the 3rd drive circuit after the 3rd gating switch
3; Described the 4th switching logic signal is applicable to the 4th power switch tube S of wide input voltage buck-boost grid-connected inverter by passing through the moving drives of 4 wheel driven after the 4th gating switch
4.
Before analyzing, make the following assumptions: 1. all power switch pipes and diode are desirable device, do not consider switching time, conduction voltage drop; 2. all inductance, electric capacity are ideal element.
In conjunction with Fig. 2～Fig. 5, narrate the specific works principle under buck pattern of the present invention, below the working condition of each switch mode is made a concrete analysis of.
Work as i
lrefduring >0, there are 2 two mode of switch mode 1 and switch mode.The first, the 5th power switch tube S
1, S
5turn-off, second, third, the 4th, the 6th power switch tube S
2, S
3, S
4, S
6hF switch.The first filter inductance current i
l1be 0.
As shown in Figure 2, switch mode 1
Four, the 6th power switch tube S
4, S
6conducting, by supply voltage U
inanode is by the 4th power switch tube S
4, the 4th diode D
4, the second filter inductance L
2, the 6th power switch tube S
6get back to supply voltage U
innegative terminal, the second filter inductance current i
l2rise.The first power switch tube S
1with the 3rd diode D
3the voltage bearing is all u
o, the second diode D
2the voltage bearing is U
in, the 5th power switch tube S
5the voltage bearing is u
o+ U
in.
As shown in Figure 3, switch mode 2
Second, third power switch tube S
2, S
3conducting, by the 3rd power switch tube S
3, the 3rd diode D
3, damping resistance R
dwith filter capacitor C
frear and net side filter inductance L connect
gwith line voltage u
gparallel branch after series connection, the second filter inductance L
2, the second diode D
2with the second power switch tube S
2form continuous current circuit, the second filter inductance current i
l2decline.The 4th power switch tube S
4the voltage bearing is u
o, the 5th, the 6th power switch tube S
5, S
6the voltage bearing is all U
in.
Work as i
lrefduring <0, there are 4 two mode of switch mode 3 and switch mode.The second, the 6th power switch tube S
2, S
6turn-off the first, the 3rd, the 4th, the 5th power switch tube S
1, S
3, S
4, S
5hF switch.The second filter inductance current i
l2be 0.
As shown in Figure 4, switch mode 3
Three, the 5th power switch tube S
3, S
5conducting, by supply voltage U
inanode is by the 3rd power switch tube S
3, the 3rd diode D
3, the first filter inductance L
1, the 5th power switch tube S
5get back to supply voltage U
innegative terminal, the first filter inductance current i
l1negative sense increases.The second power switch tube S
2with the 4th diode D
4the voltage bearing is all-u
o, the first diode D
1the voltage bearing is U
in, the 6th power switch tube S
6the voltage bearing is-u
o+ U
in.
As shown in Figure 5, switch mode 4
The first, the 4th power switch tube S
1, S
4conducting, by the 4th power switch tube S
4, the 4th diode D
4, damping resistance R
dwith filter capacitor C
frear and net side filter inductance L connect
gwith line voltage u
gparallel branch after series connection, the first filter inductance L
1, the first diode D
1with the first power switch tube S
1form continuous current circuit, the first filter inductance current i
l1negative sense reduces.The 3rd power switch tube S
3the voltage bearing is-u
o, the 5th, the 6th power switch tube S
5, S
6the voltage bearing is all U
in.
In conjunction with Fig. 3, Fig. 5～Fig. 7, narrate the specific works principle under decompression mode of the present invention, below the working condition of each switch mode is made a concrete analysis of.
Work as i
lrefduring >0, there are 2 two mode of switch mode 1 and switch mode.The first, the 4th, the 5th power switch tube S
1, S
4, S
5turn-off second, third power switch tube S
2, S
3conducting, the 6th power switch tube S
6hF switch.The first filter inductance current i
l1be 0.
As shown in Figure 6, switch mode 1
The 6th power switch tube S
6conducting, by supply voltage U
inanode is by the 3rd power switch tube S
3, the 3rd diode D
3, damping resistance R
dwith filter capacitor C
frear and net side filter inductance L connect
gwith line voltage u
gparallel branch after series connection, the second filter inductance L
2, the 6th power switch tube S
6get back to supply voltage U
innegative terminal, the second filter inductance current i
l2rise.The 4th power switch tube S
4the voltage bearing is u
o, the second diode D
2with the 5th power switch tube S
5the voltage bearing is all U
in.
As shown in Figure 3, switch mode 2
This switch mode is with the switch mode 2 under buck pattern.
Work as i
lrefduring <0, there are 4 two mode of switch mode 3 and switch mode.Second, third, the 6th power switch tube S
2, S
3, S
6turn-off the first, the 4th power switch tube S
1, S
4conducting, the 5th power switch tube S
5hF switch.The second filter inductance current i
l2be 0.
As shown in Figure 7, switch mode 3
The 5th power switch tube S
5conducting, by supply voltage U
inanode is by the 4th power switch tube S
4, the 4th diode D
4, damping resistance R
dwith filter capacitor C
frear and net side filter inductance L connect
gwith line voltage u
gparallel branch after series connection, the first filter inductance L
1, the 5th power switch tube S
5get back to supply voltage U
innegative terminal, the first filter inductance current i
l1negative sense increases.The 3rd power switch tube S
3the voltage bearing is-u
o, the first diode D
1with the 6th power switch tube S
6the voltage bearing is all U
in.
As shown in Figure 5, switch mode 4
This switch mode is with the switch mode 4 under buck pattern.
Claims (1)
1. a control method for applicable wide input voltage buck-boost grid-connected inverter, described control method adopts current sampling circuit sampling to be applicable to the first filter inductance L of wide input voltage buck-boost grid-connected inverter
1current i
l1output is applicable to the first filter inductance L of wide input voltage buck-boost grid-connected inverter
1current feedback signal i
lf1; Adopt current sampling circuit sampling to be applicable to the second filter inductance L of wide input voltage buck-boost grid-connected inverter
2current i
l2output is applicable to the second filter inductance L of wide input voltage buck-boost grid-connected inverter
2current feedback signal i
lf2; Adopt current sampling circuit sampling to be applicable to the grid current i of wide input voltage buck-boost grid-connected inverter
goutput is applicable to the grid current feedback signal i of wide input voltage buck-boost grid-connected inverter
gf; Adopt voltage sampling circuit sampling to be applicable to the line voltage u of wide input voltage buck-boost grid-connected inverter
gby the output of synchronized module and the line voltage u that is applicable to wide input voltage buck-boost grid-connected inverter
gthe given i of grid current with frequency, homophase
gref; By the given i of described grid current
grefgrid current feedback signal i with applicable wide input voltage buck-boost grid-connected inverter
gfby grid current adjuster outputting inductance given value of current i
lref; By the given i of described inductive current
lrefthe first filter inductance L with applicable wide input voltage buck-boost grid-connected inverter
1current feedback signal i
lf1by the first hysteresis current comparator, export the first switching logic signal; By the given i of described inductive current
lrefthe second filter inductance L with applicable wide input voltage buck-boost grid-connected inverter
2current feedback signal i
lf2by the second hysteresis current comparator output second switch logical signal; By the given i of described inductive current
lrefby the first comparator, export the 3rd switching logic signal with zero potential; Described the 3rd switching logic signal is exported to the 4th switching logic signal by the first inverter; Described the first switching logic signal and the 4th switching logic signal are exported to the 5th switching logic signal by first with door; Described the first switching logic signal is exported to the 5th power switch tube S that is applicable to wide input voltage buck-boost grid-connected inverter by passing through second with the 4th switching logic signal after the second inverter with door
5switching logic signal, the 5th power switch tube S of described applicable wide input voltage buck-boost grid-connected inverter
5switching logic signal by the 5th drive circuit, drive to be applicable to the 5th power switch tube S of wide input voltage buck-boost grid-connected inverter
5; Described second switch logical signal and the 3rd switching logic signal are exported to the 6th power switch tube S that is applicable to wide input voltage buck-boost grid-connected inverter by the 3rd with door
6switching logic signal, the 6th power switch tube S of described applicable wide input voltage buck-boost grid-connected inverter
6switching logic signal by the 6th drive circuit, drive to be applicable to the 6th power switch tube S of wide input voltage buck-boost grid-connected inverter
6; Described second switch logical signal is exported to a 6th switching logic signal by passing through the 4th with the 3rd switching logic signal after the 3rd inverter with door;
It is characterized in that: adopt voltage sensor sampling to be applicable to the supply voltage U of wide input voltage buck-boost grid-connected inverter
inoutput is applicable to the supply voltage feedback signal U of wide input voltage buck-boost grid-connected inverter
inf; By the supply voltage feedback signal U of described applicable wide input voltage buck-boost grid-connected inverter
infwith the given U of switched voltage
refby the second comparator output gating switch control signal U
c;
When applicable wide input voltage buck-boost grid-connected inverter is in buck pattern, described gating switch control signal U
cfor low level, gating switch 0 passage gating, drives by passing through the first drive circuit after the first gating switch the first power switch tube S that is applicable to wide input voltage buck-boost grid-connected inverter by described the 5th switching logic signal
1; Described the 6th switching logic signal is driven to the second power switch tube S that is applicable to wide input voltage buck-boost grid-connected inverter by passing through the second drive circuit after the second gating switch
2; By the 5th power switch tube S of described the 6th switching logic signal and applicable wide input voltage buck-boost grid-connected inverter
5switching logic signal successively by first or door, the 3rd gating switch, the 3rd drive circuit drive the 3rd power switch tube S of applicable wide input voltage buck-boost grid-connected inverter
3; By the 6th power switch tube S of described the 5th switching logic signal and applicable wide input voltage buck-boost grid-connected inverter
6switching logic signal successively by second or the 4th power switch tube S of the applicable wide input voltage buck-boost grid-connected inverter of the moving drives of door, the 4th gating switch, 4 wheel driven
4, circuit working is under four kinds of operation modes:
Switch mode 1, the first, the 5th power switch tube S
1, S
5turn-off the first filter inductance current i
l1it is the 0, the four, the 6th power switch tube S
4, S
6conducting, by supply voltage U
inanode is by the 4th power switch tube S
4, the 4th diode D
4, the second filter inductance L
2, the 6th power switch tube S
6get back to supply voltage U
innegative terminal, the second filter inductance current i
l2rise, the first power switch tube S
1with the 3rd diode D
3the voltage bearing is all u
o, the second diode D
2the voltage bearing is U
in, the 5th power switch tube S
5the voltage bearing is u
o+ U
in;
Switch mode 2, the first, the 5th power switch tube S
1, S
5turn-off the first filter inductance current i
l1be 0, second, third power switch tube S
2, S
3conducting, by the 3rd power switch tube S
3, the 3rd diode D
3, damping resistance R
dwith filter capacitor C
frear and net side filter inductance L connect
gwith line voltage u
gparallel branch after series connection, the second filter inductance L
2, the second diode D
2with the second power switch tube S
2form continuous current circuit, the second filter inductance current i
l2decline, the 4th power switch tube S
4the voltage bearing is u
o, the 5th, the 6th power switch tube S
5, S
6the voltage bearing is all U
in;
Switch mode 3, the second, the 6th power switch tube S
2, S
6turn-off the second filter inductance current i
l2it is the 0, the three, the 5th power switch tube S
3, S
5conducting, by supply voltage U
inanode is by the 3rd power switch tube S
3, the 3rd diode D
3, the first filter inductance L
1, the 5th power switch tube S
5get back to supply voltage U
innegative terminal, the first filter inductance current i
l1negative sense increases, the second power switch tube S
2with the 4th diode D
4the voltage bearing is all-u
o, the first diode D
1the voltage bearing is U
in, the 6th power switch tube S
6the voltage bearing is-u
o+ U
in;
Switch mode 4, the second, the 6th power switch tube S
2, S
6turn-off the second filter inductance current i
l2it is the 0, the first, the 4th power switch tube S
1, S
4conducting, by the 4th power switch tube S
4, the 4th diode D
4, damping resistance R
dwith filter capacitor C
frear and net side filter inductance L connect
gwith line voltage u
gparallel branch after series connection, the first filter inductance L
1, the first diode D
1with the first power switch tube S
1form continuous current circuit, the first filter inductance current i
l1negative sense reduces, the 3rd power switch tube S
3the voltage bearing is-u
o, the 5th, the 6th power switch tube S
5, S
6the voltage bearing is all U
in;
When applicable wide input voltage buck-boost grid-connected inverter is in decompression mode, described gating switch control signal U
cfor high level, gating switch 1 passage gating, drives by passing through the first drive circuit after the first gating switch the first power switch tube S that is applicable to wide input voltage buck-boost grid-connected inverter by described the 4th switching logic signal
1; Described the 3rd switching logic signal is driven to the second power switch tube S that is applicable to wide input voltage buck-boost grid-connected inverter by passing through the second drive circuit after the second gating switch
2; Described the 3rd switching logic signal is driven to the 3rd power switch tube S that is applicable to wide input voltage buck-boost grid-connected inverter by passing through the 3rd drive circuit after the 3rd gating switch
3; Described the 4th switching logic signal is applicable to the 4th power switch tube S of wide input voltage buck-boost grid-connected inverter by passing through the moving drives of 4 wheel driven after the 4th gating switch
4, circuit working is under four kinds of operation modes:
Switch mode 1, the first, the 4th, the 5th power switch tube S
1, S
4, S
5turn-off second, third power switch tube S
2, S
3conducting, the first filter inductance current i
l1it is 0, the six power switch tube S
6conducting, by supply voltage U
inanode is by the 3rd power switch tube S
3, the 3rd diode D
3, damping resistance R
dwith filter capacitor C
frear and net side filter inductance L connect
gwith line voltage u
gparallel branch after series connection, the second filter inductance L
2, the 6th power switch tube S
6get back to supply voltage U
innegative terminal, the second filter inductance current i
l2rise, the 4th power switch tube S
4the voltage bearing is u
o, the second diode D
2with the 5th power switch tube S
5the voltage bearing is all U
in;
Switch mode 2, this switch mode is with the switch mode 2 under buck pattern;
Switch mode 3, second, third, the 6th power switch tube S
2, S
3, S
6turn-off the first, the 4th power switch tube S
1, S
4conducting, the second filter inductance current i
l2it is 0, the five power switch tube S
5conducting, by supply voltage U
inanode is by the 4th power switch tube S
4, the 4th diode D
4, damping resistance R
dwith filter capacitor C
frear and net side filter inductance L connect
gwith line voltage u
gparallel branch after series connection, the first filter inductance L
1, the 5th power switch tube S
5get back to supply voltage U
innegative terminal, the first filter inductance current i
l1negative sense increases, the 3rd power switch tube S
3the voltage bearing is-u
o, the first diode D
1with the 6th power switch tube S
6the voltage bearing is all U
in;
Switch mode 4, this switch mode is with the switch mode 4 under buck pattern;
Wherein, U
in---supply voltage, u
g---line voltage, u
o---inverter self output voltage, i
l1, i
l2---filter inductance L
1and L
2electric current.
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| CN103441667B (en) * | 2013-09-18 | 2016-08-17 | 湘潭大学 | A kind of direct-flow controlling device being applied to multistage energy-storage system |
| CN105234529B (en) * | 2015-09-25 | 2017-04-12 | 广州亦高电气设备有限公司 | Wide-voltage self-adaptive high-power inversion electric welding machine |
| CN106877722A (en) * | 2017-04-13 | 2017-06-20 | 盐城工学院 | A kind of highly reliable buck-boost grid-connected inverter |
| CN106849731A (en) * | 2017-04-13 | 2017-06-13 | 盐城工学院 | A kind of control method of buck-boost grid-connected inverter |
| CN106849723B (en) * | 2017-04-13 | 2019-08-02 | 盐城工学院 | A kind of control method of highly reliable buck-boost grid-connected inverter |
| CN111224423B (en) * | 2019-12-06 | 2023-06-30 | 盐城工学院 | Wide-input double-grounding non-isolated single-phase photovoltaic inverter and control method thereof |
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| CN1595782A (en) * | 2004-07-01 | 2005-03-16 | 南京航空航天大学 | Double output double step-down type half bridge inverter, and control and modulation method |
| CN102005962A (en) * | 2010-11-05 | 2011-04-06 | 盐城工学院 | Buck-boost grid-connected inverter and control method thereof |
| CN102185479A (en) * | 2011-05-30 | 2011-09-14 | 南京航空航天大学 | One-cycle control circuit and control method thereof for double-input Buck converter |
| CN102332824A (en) * | 2011-09-23 | 2012-01-25 | 东南大学 | Time sharing multiplex control method for single-inductance double-output switching power supply and circuit thereof |
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|---|---|---|---|---|
| GB2489466A (en) * | 2011-03-29 | 2012-10-03 | Sony Corp | Grid tied inverter having DC-DC current fed push-pull converter |
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|---|---|---|---|---|
| CN1595782A (en) * | 2004-07-01 | 2005-03-16 | 南京航空航天大学 | Double output double step-down type half bridge inverter, and control and modulation method |
| CN102005962A (en) * | 2010-11-05 | 2011-04-06 | 盐城工学院 | Buck-boost grid-connected inverter and control method thereof |
| CN102185479A (en) * | 2011-05-30 | 2011-09-14 | 南京航空航天大学 | One-cycle control circuit and control method thereof for double-input Buck converter |
| CN102332824A (en) * | 2011-09-23 | 2012-01-25 | 东南大学 | Time sharing multiplex control method for single-inductance double-output switching power supply and circuit thereof |
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Effective date of registration: 20190312 Address after: 266000 Qingdao Economic Development Zone, Shandong Province, No. 177 Changjiang West Road Patentee after: UPC BLUE SKY PETROLEUM TECHNOLOGY Co.,Ltd. Address before: No. 9 hope Avenue, Yancheng City, Jiangsu Province, Jiangsu Patentee before: YANCHENG INSTITUTE OF TECHNOLOGY |
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