CN101951185A - Method for controlling dual buck grid-connected inverter - Google Patents
Method for controlling dual buck grid-connected inverter Download PDFInfo
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- CN101951185A CN101951185A CN 201010530693 CN201010530693A CN101951185A CN 101951185 A CN101951185 A CN 101951185A CN 201010530693 CN201010530693 CN 201010530693 CN 201010530693 A CN201010530693 A CN 201010530693A CN 101951185 A CN101951185 A CN 101951185A
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- power switch
- switch pipe
- filter inductance
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Abstract
The invention discloses a method for controlling a dual buck grid-connected inverter and belongs to a method for controlling an inverter. In the method, the access current of the grid-connected inverter is sampled by a current sensor, the grid voltage is sampled by a voltage sensor, and a given access current with the same frequency and phase as the grid voltage is output by a phaselocked loop. An inner loop of the access current receives the given access current and feedback signals of the access current and outputs logic control signals. A power switching component drive logic circuit receives the logic control signals and feedback signals of the grid voltage and outputs high-low level drive signals of each power switching component. The method only needs one current sensor, so the cost is reduced; meanwhile, the method for controlling the dual buck grid-connected inverter can reduce the volume and weight of a filter; compared with the conventional method for controlling the dual buck grid-connected inverter, the method is simple; and the method improves conversion rate as two power switching components are zero current switches, and only one power switching component switches at high frequency every half power frequency period.
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 double step-down combining inverter.
Background technology
Along with the continuous aggravation of the continuous in short supply and environmental pollution of fossil energy, become the focus of current research based on the distributed generation system of new and renewable sources of energy, combining inverter is one of them important component part.In order to guarantee the normal operation of electrical network, the reliability of combining inverter is also had higher requirement simultaneously.Dual buck half bridge inverter has improved the reliability of system owing to there is not the straight-through problem of the brachium pontis power switch pipe of conventional bridge inverter.But have the low shortcoming of input direct voltage utilance, i.e. brachium pontis output ceiling voltage has only half of input direct voltage.When output voltage was 220VAC, input direct voltage was wanted about 700V, and the voltage of the power switch pipe of then choosing quota will be greater than 700V, therefore for the difficulty of choosing of power switch pipe.And for full-bridge inverter, its input direct voltage utilance height, when output voltage was 220VAC, as long as input direct voltage was about 350V, and power switch pipe is chosen easily.But full-bridge inverter exists the brachium pontis power switch pipe to lead directly to problem, has reduced the reliability of system.In addition, though having solved full-bridge inverter, double step-down full bridge inverter exist the brachium pontis power switch pipe to lead directly to problem, but this inverter exists 4 power switch pipes and 4 fly-wheel diodes, all power switch pipe HF switch, therefore, the cost and the switching loss of this system are higher, and the volume of output filter is bigger, and weight is heavier.
Summary of the invention
The technical problem to be solved in the present invention is the control method that proposes a kind of double step-down combining inverter at the defective of prior art at being.
The control method of a kind of double step-down combining inverter of the present invention, described double step-down combining inverter comprises electrical network, power supply, first filter inductance, first power switch pipe, first fly-wheel diode, second filter inductance, second power switch pipe, second fly-wheel diode, the 3rd filter inductance, the 3rd power switch pipe, the 4th filter inductance and the 4th power switch pipe, wherein the positive pole of power supply respectively with the drain electrode of the 4th power switch pipe, the negative electrode of second fly-wheel diode, the drain electrode of the 3rd power switch pipe is connected with the negative electrode of first fly-wheel diode, the source electrode of the 4th power switch pipe connects the output of the 4th filter inductance, the input of the 4th filter inductance respectively with the output of electrical network, the input of second filter inductance connects ground connection, the output of second filter inductance respectively with the anode of second fly-wheel diode, the drain electrode of second power switch pipe connects, the source electrode of second power switch pipe respectively with the negative pole of power supply, the source electrode of first power switch pipe connects, the drain electrode of first power switch pipe respectively with the input of first filter inductance, the anode of first fly-wheel diode connects, the output of first filter inductance respectively with the input of electrical network, the output of the 3rd filter inductance connects, and the input of the 3rd filter inductance is connected with the source electrode of the 3rd power switch pipe;
Adopt current sensor sampling network access electric current output network access current feedback signal; Adopt voltage sampling circuit sampling line voltage output line voltage feedback signal; Described line voltage feedback signal is given with the network access electric current of frequency homophase by phase-locked loop output and line voltage; Described line voltage feedback signal is exported the switching logic signal of the 3rd power switch pipe by first comparator, and the switching logic signal of described the 3rd power switch pipe drives the 3rd power switch pipe by the 3rd drive circuit; The switching logic signal of the 3rd power switch pipe is exported the switching logic signal of the 4th power switch pipe by first inverter, and the switching logic signal of described the 4th power switch pipe is by moving drives the 4th power switch pipe of 4 wheel driven; Given the subtracting each other afterwards with the network access current feedback signal of described network access electric current exported the network access current regulating signal by the network access current regulator, be high-frequency modulation signal; With described network access current regulating signal by behind second inverter with the switching logic signal of the 4th power switch pipe by first with the switching logic signal of door output first power switch pipe, the switching logic signal of described first power switch pipe drives first power switch pipe by first drive circuit; With the switching logic signal of described network access current regulating signal and the 3rd power switch pipe by by second with the switching logic signal of door output second power switch pipe, the switching logic signal of described second power switch pipe drives second power switch pipe by second drive circuit.
The present invention only needs 1 current sensor, has reduced cost; Adopt the unipolarity modulation can reduce the volume and weight of filter, compare with traditional double step-down inverter, control method is simple; It is Zero Current Switch that 2 power switch pipes are arranged, and per half power frequency period has only 1 power switch pipe HF switch, has improved conversion efficiency.
Description of drawings
Fig. 1: control system block diagram of the present invention;
Fig. 2: main waveform schematic diagram of the present invention;
Fig. 3: the fundamental diagram when the present invention is in switch mode 1;
Fig. 4: the fundamental diagram when the present invention is in switch mode 2;
Fig. 5: the fundamental diagram when the present invention is in switch mode 3;
Fig. 6: the fundamental diagram when the present invention is in switch mode 4;
Embodiment
As shown in Figure 1.A kind of control method of double step-down combining inverter comprises electrical network
u Grid , power supply
U In , first filter inductance
L 1, first power switch tube S
1, first sustained diode
1, second filter inductance
L 2, second power switch tube S
2, second sustained diode
2, the 3rd filter inductance
L 3, the 3rd power switch tube S
3, the 4th filter inductance
L 4With the 4th power switch tube S
4, power supply wherein
U In Positive pole respectively with the 4th power switch tube S
4Drain electrode, second sustained diode
2Negative electrode, the 3rd power switch tube S
3The drain electrode and first sustained diode
1Negative electrode connect the 4th power switch tube S
4Source electrode connect the 4th filter inductance
L 4Output, the 4th filter inductance
L 4Input respectively with electrical network
u Grid Output, second filter inductance
L 2Input connect ground connection, second filter inductance
L 2Output respectively with second sustained diode
2Anode, second power switch tube S
2Drain electrode connect second power switch tube S
2Source electrode respectively with power supply
U In Negative pole, first power switch tube S
1Source electrode connect first power switch tube S
1Drain electrode respectively with first filter inductance
L 1Input, first sustained diode
1Anode connect first filter inductance
L 1Output respectively with electrical network
u Grid Input, the 3rd filter inductance
L 3Output connect the 3rd filter inductance
L 3Input and the 3rd power switch tube S
3Source electrode connect;
Control method is as follows: adopt current sensor sampling network access electric current
i Grid Output network access current feedback signal
i Gridf Adopt voltage sampling circuit sampling line voltage
u Grid Output line voltage feedback signal
u Gridf With described line voltage feedback signal
u Gridf By phase-locked loop pll output and line voltage
u Grid Network access electric current with the frequency homophase is given
i Ref With described line voltage feedback signal
u Gridf Export the 3rd power switch tube S by first comparator
3The switching logic signal, described the 3rd power switch tube S
3The switching logic signal drive the 3rd power switch tube S by the 3rd drive circuit
3With the 3rd power switch tube S
3The switching logic signal export the 4th power switch tube S by first inverter
4The switching logic signal, described the 4th power switch tube S
4The switching logic signal by moving drives the 4th power switch tube S of 4 wheel driven
4Described network access electric current is given
i Ref With the network access current feedback signal
i Gridf Subtract each other the back by network access current regulator output network access current regulating signal, be high-frequency modulation signal; With described network access current regulating signal by behind second inverter with the 4th power switch tube S
4The switching logic signal by first with door output first power switch tube S
1The switching logic signal, described first power switch tube S
1The switching logic signal drive first power switch tube S by first drive circuit
1With described network access current regulating signal and the 3rd power switch tube S
3The switching logic signal by by second with door output second power switch tube S
2The switching logic signal, described second power switch tube S
2The switching logic signal drive second power switch tube S by second drive circuit
2
Fig. 2 is the main waveform schematic diagram of double step-down combining inverter of the present invention.When line voltage is
u Grid 0 o'clock, first power switch tube S
1With the 4th power switch tube S
4Turn-off the 3rd power switch tube S
3Normal open, second power switch tube S
2Be copped wave pipe high frequency modulated, it is switch mode 1 and switch mode 2 that inverter has two operation modes; When line voltage is
u Grid ＜0 o'clock, second power switch tube S
2With the 3rd power switch tube S
3Turn-off the 4th power switch tube S
4Normal open, first power switch tube S
1Be copped wave pipe high frequency modulated, it is switch mode 3 and switch mode 4 that inverter has two operation modes.
As shown in Figure 3, switch mode 1:
First power switch tube S
1With the 4th power switch tube S
4Turn-off the 3rd power switch tube S
3Normal open, second power switch tube S
2Conducting, power supply
U In Output current by power supply
U In Positive pole successively by the 3rd power switch tube S
3, the 3rd filter inductance
L 3, electrical network
u Grid , second filter inductance
L 2, second power switch tube S
2Get back to power supply
U In Negative pole, the network access electric current
i Grid Forward increases, voltage between 2 of A, the D
U AD For+
U In
As shown in Figure 4, switch mode 2:
First power switch tube S
1With the 4th power switch tube S
4Turn-off the 3rd power switch tube S
3Normal open, second power switch tube S
2Turn-off, electric current is by power supply
U In Positive pole successively by the 3rd power switch tube S
3, the 3rd filter inductance
L 3, electrical network
u Grid , second filter inductance
L 2, second sustained diode
2Get back to positive source, the network access electric current
i Grid Forward reduces,
U AD =0.
As shown in Figure 5, switch mode 3:
Second power switch tube S
2With the 3rd power switch tube S
3Turn-off the 4th power switch tube S
4Normal open, first power switch tube S
1Conducting, power supply
U In Output current by power supply
U In Positive pole successively by the 4th power switch tube S
4, the 4th filter inductance
L 4, electrical network
u Grid , first filter inductance
L 1, first power switch tube S
1Get back to power supply
U In Negative pole, the network access electric current
i Grid Negative sense increases, voltage between 2 of B, the C
U BC For-
U In
As shown in Figure 6, switch mode 4:
Second power switch tube S
2With the 3rd power switch tube S
3Turn-off the 4th power switch tube S
4Normal open, first power switch tube S
1Turn-off, electric current is by power supply
U In Positive pole successively by the 4th power switch tube S
4, the 4th filter inductance
L 4, electrical network
u Grid , first filter inductance
L 1, first sustained diode
1Get back to power supply
U In Positive pole, the network access electric current
i Grid Negative sense reduces,
U BC =0.
Claims (1)
1. the control method of a double step-down combining inverter, described double step-down combining inverter comprise electrical network (
u Grid ), power supply (
U In ), first filter inductance (
L 1), the first power switch pipe (S
1), the first fly-wheel diode (D
1), second filter inductance (
L 2), the second power switch pipe (S
2), the second fly-wheel diode (D
2), the 3rd filter inductance (
L 3), the 3rd power switch pipe (S
3), the 4th filter inductance (
L 4) and the 4th power switch pipe (S
4), wherein power supply (
U In ) positive pole respectively with the 4th power switch pipe (S
4) drain electrode, the second fly-wheel diode (D
2) negative electrode, the 3rd power switch pipe (S
3) the drain electrode and the first fly-wheel diode (D
1) negative electrode connect the 4th power switch pipe (S
4) source electrode connect the 4th filter inductance (
L 4) output, the 4th filter inductance (
L 4) input respectively with electrical network (
u Grid ) output, second filter inductance (
L 2) input connect ground connection, second filter inductance (
L 2) output respectively with the second fly-wheel diode (D
2) anode, the second power switch pipe (S
2) drain electrode connect the second power switch pipe (S
2) source electrode respectively with power supply (
U In ) negative pole, the first power switch pipe (S
1) source electrode connect the first power switch pipe (S
1) drain electrode respectively with first filter inductance (
L 1) input, the first fly-wheel diode (D
1) anode connect, first filter inductance (
L 1) output respectively with electrical network (
u Grid ) input, the 3rd filter inductance (
L 3) output connect, the 3rd filter inductance (
L 3) input and the 3rd power switch pipe (S
3) source electrode connect;
It is characterized in that: employing current sensor sampling network access electric current (
i Grid ) output network access current feedback signal (
i Gridf ); Employing voltage sampling circuit sampling line voltage (
u Grid ) output line voltage feedback signal (
u Gridf ); With described line voltage feedback signal (
u Gridf ) by phase-locked loop (PLL) output and line voltage (
u Grid ) with the network access electric current of homophase frequently given (
i Ref ); With described line voltage feedback signal (
u Gridf ) export the 3rd power switch pipe (S by first comparator
3) the switching logic signal, described the 3rd power switch pipe (S
3) the switching logic signal drive the 3rd power switch pipe (S by the 3rd drive circuit
3); With the 3rd power switch pipe (S
3) the switching logic signal export the 4th power switch pipe (S by first inverter
4) the switching logic signal, described the 4th power switch pipe (S
4) the switching logic signal by moving drives the 4th power switch pipe (S of 4 wheel driven
4); With described network access electric current given (
i Ref ) and the network access current feedback signal (
i Gridf ) subtract each other the back by network access current regulator output network access current regulating signal, be high-frequency modulation signal; With described network access current regulating signal by behind second inverter with the 4th power switch pipe (S
4) the switching logic signal by first with door output first a power switch pipe (S
1) the switching logic signal, the described first power switch pipe (S
1) the switching logic signal drive the first power switch pipe (S by first drive circuit
1); With described network access current regulating signal and the 3rd power switch pipe (S
3) the switching logic signal by by second with door output second a power switch pipe (S
2) the switching logic signal, the described second power switch pipe (S
2) the switching logic signal drive the second power switch pipe (S by second drive circuit
2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105306937A CN101951185B (en) | 2010-11-04 | 2010-11-04 | Method for controlling dual buck grid-connected inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105306937A CN101951185B (en) | 2010-11-04 | 2010-11-04 | Method for controlling dual buck grid-connected inverter |
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| Publication Number | Publication Date |
|---|---|
| CN101951185A true CN101951185A (en) | 2011-01-19 |
| CN101951185B CN101951185B (en) | 2012-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105306937A Active CN101951185B (en) | 2010-11-04 | 2010-11-04 | Method for controlling dual buck grid-connected inverter |
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| Country | Link |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223101A (en) * | 2011-06-21 | 2011-10-19 | 盐城工学院 | Control method for dual-bucking full-bridge grid-connected inverter |
| CN102364864A (en) * | 2011-10-28 | 2012-02-29 | 西安交通大学 | Pulse width modulation (PWM) control circuit and control method for peak current mode inverter |
| CN103036463A (en) * | 2011-10-10 | 2013-04-10 | 艾伏新能源科技(上海)股份有限公司 | High efficiency single-phase photovoltaic grid-connected inverter |
| CN103178741A (en) * | 2013-03-04 | 2013-06-26 | 东南大学 | Interleaved parallel switch full-bridge inverter and interleaved parallel control method |
| CN103795085A (en) * | 2014-03-03 | 2014-05-14 | 苏州大学 | Photovoltaic grid-connected inverter |
| CN106849723A (en) * | 2017-04-13 | 2017-06-13 | 盐城工学院 | A kind of control method of highly reliable buck-boost grid-connected inverter |
| CN107342700A (en) * | 2017-08-18 | 2017-11-10 | 西南石油大学 | A kind of new double step-down combining inverter for eliminating common mode leakage current |
| CN108512447A (en) * | 2018-04-27 | 2018-09-07 | 西南石油大学 | A kind of double buck photovoltaic combining inverters |
| CN109194174A (en) * | 2018-09-14 | 2019-01-11 | 四川大学 | A kind of single-phase full-bridge inverter parallel running method |
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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 |
| CN101388616A (en) * | 2008-11-03 | 2009-03-18 | 南京航空航天大学 | Double step-down combining inverter |
| CN101388617A (en) * | 2008-11-05 | 2009-03-18 | 南京航空航天大学 | Double step-down bridge type inverter controlling method for single current sensor |
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Patent Citations (4)
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| US5932995A (en) * | 1998-03-03 | 1999-08-03 | Magnetek, Inc. | Dual buck converter with coupled inductors |
| 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 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223101A (en) * | 2011-06-21 | 2011-10-19 | 盐城工学院 | Control method for dual-bucking full-bridge grid-connected inverter |
| CN103036463A (en) * | 2011-10-10 | 2013-04-10 | 艾伏新能源科技(上海)股份有限公司 | High efficiency single-phase photovoltaic grid-connected inverter |
| CN102364864A (en) * | 2011-10-28 | 2012-02-29 | 西安交通大学 | Pulse width modulation (PWM) control circuit and control method for peak current mode inverter |
| CN103178741A (en) * | 2013-03-04 | 2013-06-26 | 东南大学 | Interleaved parallel switch full-bridge inverter and interleaved parallel control method |
| CN103795085A (en) * | 2014-03-03 | 2014-05-14 | 苏州大学 | Photovoltaic grid-connected inverter |
| CN106849723A (en) * | 2017-04-13 | 2017-06-13 | 盐城工学院 | A kind of control method of highly reliable 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 |
| CN107342700A (en) * | 2017-08-18 | 2017-11-10 | 西南石油大学 | A kind of new double step-down combining inverter for eliminating common mode leakage current |
| CN107342700B (en) * | 2017-08-18 | 2019-02-01 | 西南石油大学 | A kind of double step-down combining inverter for eliminating common mode leakage current |
| CN108512447A (en) * | 2018-04-27 | 2018-09-07 | 西南石油大学 | A kind of double buck photovoltaic combining inverters |
| CN109194174A (en) * | 2018-09-14 | 2019-01-11 | 四川大学 | A kind of single-phase full-bridge inverter parallel running method |
| CN109194174B (en) * | 2018-09-14 | 2019-12-17 | 四川大学 | Parallel operation method of single-phase full-bridge inverter |
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Inventor after: Li Huaiji Inventor after: Wang Dongya Inventor before: Yao Zhilei Inventor before: Hu Guowen Inventor before: Chen Rong Inventor before: Gu Chunlei Inventor before: Wang Jiangang Inventor before: Xue Yingcheng Inventor before: Shen Cuifeng |
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Effective date of registration: 20180115 Address after: 300102 Tianjin Nankai District Nanfeng Road, No. 60 West Lake Road, No. 31, Xinjiang electronic shopping mall, 13 two layers 228 (Science and Technology Park) Patentee after: WLD TECHNOLOGY DEVELOPMENT CO., LTD. Address before: 224051 Jiangsu province Yancheng City Yingbin Road No. 9 Patentee before: Yangcheng Institute of Technology |
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