CN102882406A - Control method for neutral-point voltage of bus of 10kW three-phase grid-connected inverter - Google Patents
Control method for neutral-point voltage of bus of 10kW three-phase grid-connected inverter Download PDFInfo
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- CN102882406A CN102882406A CN2012103984304A CN201210398430A CN102882406A CN 102882406 A CN102882406 A CN 102882406A CN 2012103984304 A CN2012103984304 A CN 2012103984304A CN 201210398430 A CN201210398430 A CN 201210398430A CN 102882406 A CN102882406 A CN 102882406A
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Abstract
The invention relates to a control technique of a photovoltaic power generation system device and particularly relates to a control method for a neutral-point voltage of a bus of a 10kW three-phase grid-connected inverter. The method comprises the following steps of: alternately sampling voltages at two ends of voltage dividing capacitor C1 and C2 of the bus at the same interval T to respectively obtain sampling values VC1 and VC2; and comparing VC1 and VC2 with 1/2 of the voltage value of the bus, if the deviation range exceeds a set value, regulating the duty ratio of main switch tubes in two Boost converters to ensure that the values of VC1 and VC2 are returned to be equal to the 1/2 of the voltage value of the bus. The method provided by the invention is simple in control step, a voltage dividing resistor is not required to be arranged, and the power consumption is reduced; and the whole process is controlled by virtue of computer software, so that the control precision is high, the stability of the neutral-point voltage of the bus is good, and therefore, the higher power output quality requirement can be fulfilled.
Description
Technical field
The present invention relates to the control technology of photovoltaic generating system equipment, specifically a kind of control method of bus mid-point voltage of 10kW three-phase grid-connected inverter.
Background technology
In the existing photovoltaic generating system, the topological structure of converter main circuit as shown in Figure 1, generally include the Boost converter and the T-shaped three-level inverter that is positioned at rear class of the prime that is positioned at prime, T-shaped three-level inverter includes the bus dividing potential drop capacitor C between the input bus
1And C
2In theory, bus dividing potential drop capacitor C
1And C
2Both end voltage equates, for late-class circuit provides voltage.But because the existence of the problems such as electric capacity production technology is difficult to guarantee C
1And C
2Identical, and then bring the problem of busbar voltage unbalanced-voltage-division, cause working as N
eDuring as zero point of three-phase voltage, T-shaped three-level inverter output voltage three-phase is not exclusively symmetrical, namely produces the fluctuation of inverter mid-point voltage, has affected the electric power output quality.Conventional art adopts the method for divider resistance more for the unbalanced control method of bus mid-point voltage, control precision is not high, produces too much energy consumption at resistance, has increased power consumption.
Summary of the invention
Technical problem to be solved by this invention is that the control method of the bus mid-point voltage of the 10kW three-phase grid-connected inverter that a kind of control precision is high, output quality stable, energy consumption is low is provided.
The control method of the bus mid-point voltage of 10kW three-phase grid-connected inverter of the present invention based on converter main circuit include the two-way Boost converter of the prime that is positioned at prime and be positioned at the T-shaped three-level inverter of rear class, T-shaped three-level inverter includes the bus dividing potential drop capacitor C between the input bus
1And C
2, its concrete control method is: with the time interval T that equates alternately to bus dividing potential drop capacitor C
1And C
2The voltage at two ends is taken a sample, and obtains respectively sampling value V
C1And V
C2With V
C1And V
C2/ 2nd values with busbar voltage compare respectively, as depart from scope above set point, then by adjusting the duty ratio of main switch in the two-way Boost converter, make V
C1And V
C2Value be returned to 1/2nd values of busbar voltage and equate.
Described time interval T is 0.1-0.3 second.
Method control step of the present invention is simple, do not need to arrange divider resistance, reduced power loss, it can be controlled whole process by computer software, control precision is high, bus mid-point voltage good stability, can satisfy higher electric power output quality requirement.
Description of drawings
Fig. 1 is existing 10kW converter main circuit topology structure chart.
Embodiment
The embodiment of the inventive method is as follows:
The method is based on 10kW converter main circuit shown in Figure 1.This circuit prime adopts two-way Boost converter 1, L
1And L
2Boost inductance, Q
B1And Q
B2Main switch, D
B1And D
B2It is fly-wheel diode; Rear class adopts T-shaped three-level inverter 2, C
1And C
2Bus dividing potential drop electric capacity, L
a, L
bAnd L
cThe inverter output inductor, v
a, v
bAnd v
cIt is three-phase voltage.In the present embodiment, photovoltaic battery panel input voltage 250V-800V, Boost converter output voltage 800V, inverter output 220V alternating voltage, bus dividing potential drop capacitor C
1And C
2Be 560 μ F.In the control procedure take 0.2 second as the time interval alternately to bus dividing potential drop capacitor C
1And C
2The voltage at two ends is taken a sample, and obtains respectively sampling value V
C1And V
C2With V
C1And V
C2/ 2nd values with busbar voltage compare respectively, as depart from scope above set point, then by adjusting the duty ratio of main switch in the two-way Boost converter, make V
C1And V
C2Value be returned to 1/2nd values of busbar voltage and equate.
This embodiment circuit median generatrix mid-point voltage is carried out monitoring test, and voltage fluctuation has been satisfied instructions for use below 0.5%.
Claims (2)
1. the control method of the bus mid-point voltage of a 10kW three-phase grid-connected inverter, its based on converter main circuit include the two-way Boost converter of the prime that is positioned at prime and be positioned at the T-shaped three-level inverter of rear class, T-shaped three-level inverter includes the bus dividing potential drop capacitor C between the input bus
1And C
2, it is characterized in that: with the time interval T that equates alternately to bus dividing potential drop capacitor C
1And C
2The voltage at two ends is taken a sample, and obtains respectively sampling value V
C1And V
C2With V
C1And V
C2/ 2nd values with busbar voltage compare respectively, as depart from scope above set point, then by adjusting the duty ratio of main switch in the two-way Boost converter, make V
C1And V
C2Value be returned to 1/2nd values of busbar voltage and equate.
2. the control method of the bus mid-point voltage of 10kW three-phase grid-connected inverter according to claim 1, it is characterized in that: described time interval T is 0.1-0.3 second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103984304A CN102882406A (en) | 2012-10-19 | 2012-10-19 | Control method for neutral-point voltage of bus of 10kW three-phase grid-connected inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103984304A CN102882406A (en) | 2012-10-19 | 2012-10-19 | Control method for neutral-point voltage of bus of 10kW three-phase grid-connected inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102882406A true CN102882406A (en) | 2013-01-16 |
Family
ID=47483611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012103984304A Pending CN102882406A (en) | 2012-10-19 | 2012-10-19 | Control method for neutral-point voltage of bus of 10kW three-phase grid-connected inverter |
Country Status (1)
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248256A (en) * | 2013-05-20 | 2013-08-14 | 合肥工业大学 | Voltage-multiplying three-level photovoltaic grid-connected inverter with neutral point balance capability |
| WO2014206092A1 (en) * | 2013-06-24 | 2014-12-31 | 华为技术有限公司 | Single-phase inverter and three-phase inverter |
| CN104734548A (en) * | 2015-04-07 | 2015-06-24 | 深圳市英威腾电气股份有限公司 | Photovoltaic grid-connected inverter and photovoltaic grid-connected inverter control method |
| CN105048508A (en) * | 2015-09-08 | 2015-11-11 | 苏州大学张家港工业技术研究院 | Method and system for controlling T-type three-level single-phase grid-connected inverter |
| CN105529948A (en) * | 2016-01-29 | 2016-04-27 | 南京航空航天大学 | Double-input three-phase inverter |
| CN105827128A (en) * | 2016-05-11 | 2016-08-03 | 武汉衡伟信息技术有限公司 | Frequency converter |
| CN107078661A (en) * | 2014-10-22 | 2017-08-18 | 奥的斯电梯公司 | The T-shaped NPC power converters of three-level |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000350465A (en) * | 1999-06-01 | 2000-12-15 | Yaskawa Electric Corp | Three-level inverter |
| US6226192B1 (en) * | 1997-10-28 | 2001-05-01 | Kabushiki Kaisha Yaskawa Denki | Three-level neutral point clamping type inverter circuit |
| CN201869117U (en) * | 2010-08-27 | 2011-06-15 | 成都英格瑞德电气有限公司 | Efficient isolation inverter circuit |
| CN102684533A (en) * | 2012-05-08 | 2012-09-19 | 华中科技大学 | Neutral point voltage control method for neutral point clamped (NPC) type three-level inverter based on carrier amplitude shift |
-
2012
- 2012-10-19 CN CN2012103984304A patent/CN102882406A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6226192B1 (en) * | 1997-10-28 | 2001-05-01 | Kabushiki Kaisha Yaskawa Denki | Three-level neutral point clamping type inverter circuit |
| JP2000350465A (en) * | 1999-06-01 | 2000-12-15 | Yaskawa Electric Corp | Three-level inverter |
| CN201869117U (en) * | 2010-08-27 | 2011-06-15 | 成都英格瑞德电气有限公司 | Efficient isolation inverter circuit |
| CN102684533A (en) * | 2012-05-08 | 2012-09-19 | 华中科技大学 | Neutral point voltage control method for neutral point clamped (NPC) type three-level inverter based on carrier amplitude shift |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248256A (en) * | 2013-05-20 | 2013-08-14 | 合肥工业大学 | Voltage-multiplying three-level photovoltaic grid-connected inverter with neutral point balance capability |
| WO2014206092A1 (en) * | 2013-06-24 | 2014-12-31 | 华为技术有限公司 | Single-phase inverter and three-phase inverter |
| CN107078661A (en) * | 2014-10-22 | 2017-08-18 | 奥的斯电梯公司 | The T-shaped NPC power converters of three-level |
| CN104734548A (en) * | 2015-04-07 | 2015-06-24 | 深圳市英威腾电气股份有限公司 | Photovoltaic grid-connected inverter and photovoltaic grid-connected inverter control method |
| CN104734548B (en) * | 2015-04-07 | 2017-11-07 | 深圳市英威腾电气股份有限公司 | A kind of control method of photovoltaic combining inverter and photovoltaic combining inverter |
| CN105048508A (en) * | 2015-09-08 | 2015-11-11 | 苏州大学张家港工业技术研究院 | Method and system for controlling T-type three-level single-phase grid-connected inverter |
| CN105529948A (en) * | 2016-01-29 | 2016-04-27 | 南京航空航天大学 | Double-input three-phase inverter |
| CN105529948B (en) * | 2016-01-29 | 2019-02-26 | 南京航空航天大学 | Dual input three-phase inverter |
| CN105827128A (en) * | 2016-05-11 | 2016-08-03 | 武汉衡伟信息技术有限公司 | Frequency converter |
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Application publication date: 20130116 |