CN103312211A - Control method of single phase grid-connected inverter - Google Patents
Control method of single phase grid-connected inverter Download PDFInfo
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- CN103312211A CN103312211A CN2013102643330A CN201310264333A CN103312211A CN 103312211 A CN103312211 A CN 103312211A CN 2013102643330 A CN2013102643330 A CN 2013102643330A CN 201310264333 A CN201310264333 A CN 201310264333A CN 103312211 A CN103312211 A CN 103312211A
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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
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
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Abstract
The invention relates to a control method of a single phase grid-connected inverter and aims at solving the technical problem that when a circuit topology of the existing single phase grid-connected inverter and a control method of the circuit topology are inappropriately selected, change of the sum of common mode voltage at the output end is large and accordingly the output common mode current is too large. The technical scheme is that when the mains voltage is in a positive half circle, a fifth switching device is connected constantly, a first switching device and a fourth switching device which have the same working state are connected and disconnected with high frequency, and a sixth switching device is disconnected constantly; and when the mains voltage is in a negative half circle, the sixth switching device is connected constantly, a third switching device and a second switching device which have the same working state are connected and disconnected with high frequency, and the fifth switching device is disconnected constantly. The control method has the advantages that the sum of the common mode voltage at the output end of the single phase grid-connected inverter is constant, the single phase grid-connected inverter achieves high conversion efficiency while ensuring small output common mode current, and meanwhile potential safety hazards are removed, loss is reduced and performance is improved.
Description
Technical field
The invention belongs to generating equipment control method technical field, relate to a kind of control method of control method, particularly a kind of single-phase grid-connected inverter of inverter.
Background technology
Inverter especially combining inverter generally is divided into photovoltaic combining inverter, wind power-generating grid-connected inverter, power-equipment combining inverter and other generating equipment combining inverters, be used for realizing that direct current energy arrives the efficient conversion of AC energy, single-phase grid-connected inverter becomes the main flow in market now.Improper but if the circuit topology of single-phase grid-connected inverter and control method thereof are selected, then can cause the common-mode voltage sum of output to change greatly, can not remain a constant, thereby cause that the output common mode electric current is excessive, there is potential safety hazard.
Summary of the invention
The objective of the invention is to select can not cause at that time the common-mode voltage sum of output to change greatly in order to solve existing single-phase grid-connected inverter at circuit topology and control method thereof, and then cause the excessive technical problem of output common mode electric current, in order to address this problem, the present invention proposes a kind of circuit topology and control method thereof of single-phase grid-connected inverter, so that the common-mode voltage sum of single-phase grid-connected inverter output is constant, when guaranteeing that the output common mode electric current is very little, so that single-phase grid-connected inverter reaches higher conversion efficiency.The present invention had both eliminated potential safety hazard, had reduced again the loss of single-phase grid-connected inverter, had improved the performance of single-phase grid-connected inverter.
The present invention for realizing the concrete technical scheme that goal of the invention adopts is: a kind of control method of single-phase grid-connected inverter, single-phase grid-connected inverter comprises DC power supply, inversion module and output module, key is: described inversion module comprises the first brachium pontis and the second brachium pontis that is connected to the DC power supply two ends, and be connected in series in auxiliary brachium pontis between the both positive and negative polarity of DC power supply by the 7th diode and the 8th diode
The first brachium pontis comprises the first switching device, second switch device, the 5th switching device, the first switching device and second switch device are connected in series between the both positive and negative polarity of DC power supply, and the 5th switching device is connected between the mid point of the mid point of the 7th diode and the 8th diode and the first switching device and second switch device;
The second brachium pontis comprises the 3rd switching device, the 4th switching device, the 6th switching device, the 3rd switching device and the 4th switching device are connected in series between the both positive and negative polarity of DC power supply, and the 6th switching device is connected between the mid point of the mid point of the 7th diode and the 8th diode and the 3rd switching device and the 4th switching device;
Output module comprises the first inductance, the second inductance and filter capacitor, the first end of the first inductance is connected in the mid point of the first brachium pontis, the first end of the second inductance is connected in the mid point of the second brachium pontis, the second end of the first inductance and the second end of the second inductance are connected to the two ends of AC load or civil power, filter capacitor also is connected in the two ends of AC load or civil power
On this basis, the control method of single-phase grid-connected inverter comprises:
When line voltage is positive half cycle, all the time conducting of the 5th switching device, the first switching device is identical with the operating state of the 4th switching device, and high frequency turns on and off, and the 6th switching device turn-offs all the time;
When line voltage is negative half period, all the time conducting of the 6th switching device, the 3rd switching device is identical with the operating state of second switch device, and high frequency turns on and off, and the 5th switching device turn-offs all the time.
The invention has the beneficial effects as follows: the common-mode voltage sum of single-phase grid-connected inverter output is constant, has eliminated potential safety hazard, when guaranteeing that the output common mode electric current is very little, so that single-phase grid-connected inverter reaches higher conversion efficiency.Auxiliary brachium pontis provides a virtual direct current mid point can for the 5th switching device and the 6th switching device, and don't participate in the loop of energy flow, so that the 5th switching device of continuous current circuit and the 6th switching device not at Energy Transfer to the loop of electrical network, thereby reduced the conduction loss of a switching device, in whole output power range, can both further improve the conversion efficiency of single-phase grid-connected inverter.
Description of drawings
Fig. 1 is the circuit theory schematic diagram of single-phase grid-connected inverter among the present invention.
Fig. 2 be among the present invention single-phase grid-connected inverter when the civil power positive half period, the current circuit schematic diagram when high frequency switching device is opened.
Fig. 3 be among the present invention single-phase grid-connected inverter when the civil power positive half period, the current circuit schematic diagram when high frequency switching device turn-offs.
Fig. 4 be among the present invention single-phase grid-connected inverter when the civil power negative half-cycle, the current circuit schematic diagram when high frequency switching device is opened.
Fig. 5 be among the present invention single-phase grid-connected inverter when the civil power negative half-cycle, the current circuit schematic diagram when high frequency switching device turn-offs.
In the accompanying drawing, Vdc represents DC power supply, D1 represents the first diode, and D2 represents the second diode, and D3 represents the 3rd diode, D4 represents the 4th diode, D5 represents the 5th diode, and D6 represents the 6th diode, and D7 represents the 7th diode, D8 represents the 8th diode, S1 represents the first switching device, and S2 represents the second switch device, and S3 represents the 3rd switching device, S4 represents the 4th switching device, S5 represents the 5th switching device, and S6 represents the 6th switching device, and L1 represents the first inductance, L2 represents the second inductance, and C1 represents filter capacitor.
Embodiment
A kind of control method of single-phase grid-connected inverter, single-phase grid-connected inverter comprises DC power supply Vdc, inversion module and output module, key is: described inversion module comprises the first brachium pontis and the second brachium pontis that is connected to DC power supply Vdc two ends, and be connected in series in auxiliary brachium pontis between the both positive and negative polarity of DC power supply Vdc by the 7th diode D7 and the 8th diode D8
The first brachium pontis comprises the first switching device S1, second switch device S2, the 5th switching device S5, the first switching device S1 and second switch device S2 are connected in series between the both positive and negative polarity of DC power supply Vdc, and the 5th switching device S5 is connected between the mid point of the mid point of the 7th diode D7 and the 8th diode D8 and the first switching device S1 and second switch device S2;
The second brachium pontis comprises the 3rd switching device S3, the 4th switching device S4, the 6th switching device S6, the 3rd switching device S3 and the 4th switching device S4 are connected in series between the both positive and negative polarity of DC power supply Vdc, and the 6th switching device S6 is connected between the mid point of the mid point of the 7th diode D7 and the 8th diode D8 and the 3rd switching device S3 and the 4th switching device S4;
Output module comprises the first inductance L 1, the second inductance L 2 and filter capacitor C1, the first end of the first inductance L 1 is connected in the mid point of the first brachium pontis, the first end of the second inductance L 2 is connected in the mid point of the second brachium pontis, the second end of the second end of the first inductance L 1 and the second inductance L 2 is connected to the two ends of AC load or civil power, filter capacitor C1 also is connected in the two ends of AC load or civil power
On this basis, the control method of single-phase grid-connected inverter comprises:
When line voltage is positive half cycle, the 5th all the time conducting of switching device S5, the first switching device S1 is identical with the operating state of the 4th switching device S4, and high frequency turns on and off, and the 6th switching device S6 turn-offs all the time;
When line voltage is negative half period, the 6th all the time conducting of switching device S6, the 3rd switching device S3 is identical with the operating state of second switch device S2, and high frequency turns on and off, and the 5th switching device S5 turn-offs all the time.
The equal reverse parallel connection in two ends of described the first switching device S1, second switch device S2, the 3rd switching device S3, the 4th switching device S4, the 5th switching device S5, the 6th switching device S6 has diode.
Described six switching devices are insulated gate bipolar transistor IGBT, or are metal-oxide layer-semiconductor-field-effect transistor MOSFET.
When line voltage was positive half cycle, the driving signal of described the first switching device S1 and the 4th switching device S4 was high-frequency signal, and the driving signal of the 5th switching device S5 and the 6th switching device S6 is power frequency component.
When line voltage was negative half period, the driving signal of described the 3rd switching device S3 and second switch device S2 was high-frequency signal, and the driving signal of the 5th switching device S5 and the 6th switching device S6 is power frequency component.
Operation principle of the present invention is: when line voltage is positive half cycle, the first switching device S1 is identical with the driving signal of the 4th switching device S4, it all is high-frequency signal, the 5th switching device S5 is identical with the driving signal of the 6th switching device S6, all be power frequency component, the 5th all the time conducting of switching device S5, the 6th switching device S6 turn-off all the time.When high frequency switching device was opened, electric current was from the positive pole of DC power supply Vdc, and the first switching device S1 that flows through, the first inductance L 1, AC load or civil power, the second inductance L 2, the 4th switching device S4 flow back into the negative pole of DC power supply Vdc, as shown in Figure 2.When high frequency switching device turn-offs, inductive current then flow through the first inductance L 1, AC load or civil power, the second inductance L 2, the 6th diode D6, the 5th switching device S5, as shown in Figure 3.
When line voltage is negative half period, the 3rd switching device S3 is identical with the driving signal of second switch device S2, it all is high-frequency signal, five switching device S5 are identical with the driving signal of the 6th switching device S6, all be power frequency component, the 5th switching device S5 turn-offs all the time, the 6th switching device S6 is open-minded all the time.When high frequency switching device was opened, electric current was from the positive pole of DC power supply Vdc, and the 3rd switching device S3 that flows through, the second inductance L 2, AC load or civil power, the first inductance L 1, second switch device S2 flow back into the negative pole of DC power supply Vdc, as shown in Figure 4.When high frequency switching device turn-offs, inductive current then flow through the second inductance L 2, AC load or civil power, the first inductance L 1, the 5th diode D5, the 6th switching device S6, as shown in Figure 5.
This control method is so that the common-mode voltage sum of single-phase grid-connected inverter output is constant, when guaranteeing that the output common mode electric current is very little, so that single-phase grid-connected inverter reaches higher conversion efficiency.
Claims (5)
1. the control method of a single-phase grid-connected inverter, single-phase grid-connected inverter comprises DC power supply (Vdc), inversion module and output module, it is characterized in that: described inversion module comprises the first brachium pontis and the second brachium pontis that is connected to DC power supply (Vdc) two ends, and be connected in series in auxiliary brachium pontis between the both positive and negative polarity of DC power supply (Vdc) by the 7th diode (D7) and the 8th diode (D8)
The first brachium pontis comprises the first switching device (S1), second switch device (S2), the 5th switching device (S5), the first switching device (S1) and second switch device (S2) are connected in series between the both positive and negative polarity of DC power supply (Vdc), and the 5th switching device (S5) is connected between the mid point of the mid point of the 7th diode (D7) and the 8th diode (D8) and the first switching device (S1) and second switch device (S2);
The second brachium pontis comprises the 3rd switching device (S3), the 4th switching device (S4), the 6th switching device (S6), the 3rd switching device (S3) and the 4th switching device (S4) are connected in series between the both positive and negative polarity of DC power supply (Vdc), and the 6th switching device (S6) is connected between the mid point of the mid point of the 7th diode (D7) and the 8th diode (D8) and the 3rd switching device (S3) and the 4th switching device (S4);
Output module comprises the first inductance (L1), the second inductance (L2) and filter capacitor (C1), the first end of the first inductance (L1) is connected in the mid point of the first brachium pontis, the first end of the second inductance (L2) is connected in the mid point of the second brachium pontis, the second end of the second end of the first inductance (L1) and the second inductance (L2) is connected to the two ends of AC load or civil power, filter capacitor (C1) also is connected in the two ends of AC load or civil power
On this basis, the control method of single-phase grid-connected inverter comprises:
When line voltage is positive half cycle, all the time conducting of the 5th switching device (S5), the first switching device (S1) is identical with the operating state of the 4th switching device (S4), and high frequency turns on and off, and the 6th switching device (S6) turn-offs all the time;
When line voltage is negative half period, all the time conducting of the 6th switching device (S6), the 3rd switching device (S3) is identical with the operating state of second switch device (S2), and high frequency turns on and off, and the 5th switching device (S5) turn-offs all the time.
2. the control method of a kind of single-phase grid-connected inverter according to claim 1, it is characterized in that: the equal reverse parallel connection in two ends of described the first switching device (S1), second switch device (S2), the 3rd switching device (S3), the 4th switching device (S4), the 5th switching device (S5), the 6th switching device (S6) has diode.
3. the control method of a kind of single-phase grid-connected inverter according to claim 1, it is characterized in that: described six switching devices are insulated gate bipolar transistor IGBT, or are metal-oxide layer-semiconductor-field-effect transistor MOSFET.
4. the control method of a kind of single-phase grid-connected inverter according to claim 1, it is characterized in that: when line voltage is positive half cycle, the driving signal of described the first switching device (S1) and the 4th switching device (S4) is high-frequency signal, and the driving signal of the 5th switching device (S5) and the 6th switching device (S6) is power frequency component.
5. the control method of a kind of single-phase grid-connected inverter according to claim 1, it is characterized in that: when line voltage is negative half period, the driving signal of described the 3rd switching device (S3) and second switch device (S2) is high-frequency signal, and the driving signal of the 5th switching device (S5) and the 6th switching device (S6) is power frequency component.
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| CN2013102643330A CN103312211A (en) | 2013-06-28 | 2013-06-28 | Control method of single phase grid-connected inverter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746591A (en) * | 2013-12-20 | 2014-04-23 | 北京交通大学 | H6 one-phase non-isolated photovoltaic grid-connected inverter and modulation method thereof |
| CN104270024A (en) * | 2014-08-26 | 2015-01-07 | 苏州市职业大学 | Single-phase three-level inverter |
| CN111642061A (en) * | 2020-06-01 | 2020-09-08 | 西安交通大学 | Vienna rectifying silicon carbide power module with double-sided structure and preparation method thereof |
| CN112311262A (en) * | 2020-10-21 | 2021-02-02 | 湖南大学 | Single-phase current type inverter, inverter circuit and control method thereof |
| EP3273588B1 (en) * | 2015-06-30 | 2021-10-13 | Omron Corporation | Inverter circuit and power conversion device |
| CN113595428A (en) * | 2021-09-30 | 2021-11-02 | 浙江日风电气股份有限公司 | Single-phase three-level inverter circuit |
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| CN102223097A (en) * | 2011-06-27 | 2011-10-19 | 上海正泰电源系统有限公司 | Transformerless inverter circuit |
| CN102231606A (en) * | 2011-06-18 | 2011-11-02 | 江苏艾索新能源股份有限公司 | Transformerless gird-connected inverter circuit |
| CN102611347A (en) * | 2011-01-21 | 2012-07-25 | 北京动力源科技股份有限公司 | Single-phase non-isolated solar grid-connected inverter |
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| CN101662229A (en) * | 2008-08-27 | 2010-03-03 | 三垦电气株式会社 | Resonance type inverter |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746591A (en) * | 2013-12-20 | 2014-04-23 | 北京交通大学 | H6 one-phase non-isolated photovoltaic grid-connected inverter and modulation method thereof |
| CN103746591B (en) * | 2013-12-20 | 2015-12-02 | 北京交通大学 | A kind of single-phase non-isolated grid-connected inverter of H6 and modulator approach thereof |
| CN104270024A (en) * | 2014-08-26 | 2015-01-07 | 苏州市职业大学 | Single-phase three-level inverter |
| CN104270024B (en) * | 2014-08-26 | 2018-02-06 | 苏州市职业大学 | A kind of single-phase three-level inverter |
| EP3273588B1 (en) * | 2015-06-30 | 2021-10-13 | Omron Corporation | Inverter circuit and power conversion device |
| CN111642061A (en) * | 2020-06-01 | 2020-09-08 | 西安交通大学 | Vienna rectifying silicon carbide power module with double-sided structure and preparation method thereof |
| CN111642061B (en) * | 2020-06-01 | 2021-12-28 | 西安交通大学 | Vienna rectifying silicon carbide power module with double-sided structure and preparation method thereof |
| CN112311262A (en) * | 2020-10-21 | 2021-02-02 | 湖南大学 | Single-phase current type inverter, inverter circuit and control method thereof |
| CN113595428A (en) * | 2021-09-30 | 2021-11-02 | 浙江日风电气股份有限公司 | Single-phase three-level inverter circuit |
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Application publication date: 20130918 |