CN101621206A - Combination method of photovoltaic combination inverter containing transformer at AC side - Google Patents
Combination method of photovoltaic combination inverter containing transformer at AC side Download PDFInfo
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- CN101621206A CN101621206A CN200910144506A CN200910144506A CN101621206A CN 101621206 A CN101621206 A CN 101621206A CN 200910144506 A CN200910144506 A CN 200910144506A CN 200910144506 A CN200910144506 A CN 200910144506A CN 101621206 A CN101621206 A CN 101621206A
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Abstract
The invention relates to a grid-combination operation method of a photovoltaic grid-combination inverter containing a transformer at the AC side. The DC side of the inverter is provided with a DC voltage transducer, the AC output side of the inverter is provided with an AC contactor, and the transformer approaching side and the electric grid approaching side of the AC contactor are provided with AC voltage transducers which firstly detect voltage amplitude values, frequency and phases of both sides of the AC contactor; after a DC transducer is detected to arrive a lowest starting voltage point of the inverter, when an elastic grid is not accessed, the inverter independently operates firstly, the AC contactor retains disconnection until a voltage amplitude value and a phase of the elastic grid approaching side of the transformer are consistent with a phase and an amplitude value of the voltage of an elastic grid, and an inverter control circuit controls the AC contactor to actuate so as to be combined to the grid. The grid-combination operation method can not cause the frequent switch-on and shut-down of a system and a contactor at the AC side, thereby increasing the system reliability.
Description
Technical field
The present invention relates to a kind of combination method of photovoltaic combining inverter, be specifically related to a kind of combination method of photovoltaic combination inverter that AC side comprises band power frequency isolating transformer that is used for.
Background technology
The photovoltaic combining inverter of band power frequency isolating transformer generally is when the direct voltage of input reaches Minimum Acceptable Value when being incorporated into the power networks at present, with regard to the contactor or the relay of adhesive AC side, makes AC side insert electrical network and begins to generate electricity by way of merging two or more grid systems.This logic control mode that directly is incorporated into the power networks, at first can make direct voltage when solar cell array when the input voltage minimum point fluctuates up and down, the i.e. mode that when the DC side energy shortage, is incorporated into the power networks by force, can cause frequent switching on and shutting down of system and AC side contactor to open shutoff repeatedly, shorten the life-span of contactor; Secondly, when the energy that provides when the direct current input is not enough, need set up excitation to transformer, cause the energy loss of electrical network on the contrary from the AC side power taking.The 3rd, if the output voltage of inverter and line voltage are incorporated into the power networks when phase place and amplitude differ big, can impact simultaneously to inverter and electrical network, reduce the reliability of system, reduce transformer's life span.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, designed and developed out a kind of frequent switching on and shutting down of system and AC side contactor of can not causing and opened shutoff repeatedly, improved the combination method of photovoltaic combination inverter of system reliability.
The present invention is achieved by the following technical solutions:
A kind ofly be used for the combination method of photovoltaic combination inverter that AC side comprises transformer, in DC side the direct voltage transducer is installed, exchange outlet side A.C. contactor is installed, and with close grid side AC voltage sensor is installed all in the close transformer side of A.C. contactor; AC voltage sensor at first detects voltage magnitude, frequency and the phase place of the both sides of inverter A.C. contactor, and AC voltage sensor is handled the data of being gathered and moved in order to control inverter again by inverter control circuit; When direct current transducer detect reach the inverter lowest starting voltage point after, inverter independent operating at first under the situation that electrical network does not insert, A.C. contactor keeps disconnecting, all phase place and the amplitude with line voltage is consistent with phase place up to working as the amplitude of transformer near the voltage of electrical network one side, the adhesive of inverter control circuit control A.C. contactor begins to generate electricity by way of merging two or more grid systems; If transformer can't reach the line voltage value all the time near the amplitude of the alternating voltage of electrical network one side, or frequency and phase place all the time can't be synchronous fully with the frequency or the phase place of line voltage, inverter control circuit control A.C. contactor keeps off-state, the inverter work of not being incorporated into the power networks.
A kind ofly be used for the combination method of photovoltaic combination inverter that AC side comprises transformer, describedly all with after the phase place of line voltage and amplitude are consistent keep a period of time near the amplitude of the voltage of electrical network one side and phase place when transformer, inverter is controlled the A.C. contactor adhesive again.
Inverter all needs at first independent operating at every turn among the present invention before generating electricity by way of merging two or more grid systems, and after waiting for the transformer voltage on line side and electrical network amplitude and phase place being consistent, closed again A.C. contactor generates electricity by way of merging two or more grid systems.Be compared to common inverter and be incorporated into the power networks, this interconnection technology at first provides energy to transformer from the direct current input side, need not to obtain magnetization energy from electrical network, has reduced system loss; Secondly be incorporated into the power networks again with the amplitude same-phase at voltage and the line voltage of waiting for the transformer outlet side, can't be incorporated into the power networks in that the situation of dc energy deficiency is next, so just avoided generating electricity by way of merging two or more grid systems by force under the situation of dc energy the deficiency frequent switching on and shutting down that caused and the break-make repeatedly of A.C. contactor have improved the reliability of system.
Description of drawings
Accompanying drawing is the electrical block diagram of photovoltaic combining inverter grid-connected system of the present invention.
Embodiment
Shown in accompanying drawing.
Embodiment 1
The present invention is equipped with direct voltage transducer 1 at the direct current input side, exchanges outlet side A.C. contactor 5 is installed, and with close grid side AC voltage sensor 4 is installed all in close transformer 3 one sides of A.C. contactor 5; AC voltage sensor 4 at first detects voltage magnitude, frequency and the phase place of the both sides of inverter 2 A.C. contactors, and AC voltage sensor 4 is handled the data of being gathered and moved in order to control inverter 2 by inverter control circuit 6; When direct voltage transducer 1 detect reach inverter 2 lowest starting voltage point after, inverter 2 independent operating at first under the situation that electrical network does not insert, A.C. contactor 5 keeps disconnecting, all phase place and the amplitude with line voltage is consistent with phase place up to working as the amplitude of transformer 3 near the voltage of electrical network one sides, 5 adhesives of inverter control circuit 6 control A.C. contactors begin to generate electricity by way of merging two or more grid systems; If transformer 3 can't reach the line voltage value all the time near the amplitude of the alternating voltage of electrical network one side, or frequency and phase place all the time can't be synchronous fully with the frequency or the phase place of line voltage, inverter control circuit 6 control A.C. contactors 5 keep off-states, inverter 1 work of not being incorporated into the power networks.
The present invention is equipped with direct voltage transducer 1 at the direct current input side, exchanges outlet side A.C. contactor 5 is installed, and with close grid side AC voltage sensor 4 is installed all in close transformer 3 one sides of A.C. contactor 5; AC voltage sensor 4 at first detects voltage magnitude, frequency and the phase place of the both sides of inverter A.C. contactor 5, and AC voltage sensor 4 is handled the data of being gathered and moved in order to control inverter 2 by inverter control circuit 6; When direct voltage transducer 1 detect reach inverter 2 lowest starting voltage point after, inverter 2 independent operating at first under the situation that electrical network does not insert, A.C. contactor 5 keeps disconnecting, up to all with after the phase place of line voltage and amplitude are consistent keeping a period of time again near the amplitude of the voltage of electrical network one sides and phase place when transformer 3,5 adhesives of inverter control circuit 6 control A.C. contactors begin to generate electricity by way of merging two or more grid systems; If transformer 3 can't reach the line voltage value all the time near the amplitude of the alternating voltage of electrical network one side, or frequency and phase place all the time can't be synchronous fully with the frequency or the phase place of line voltage, inverter control circuit 6 control A.C. contactors 5 keep off-states, inverter 2 work of not being incorporated into the power networks.
Claims (2)
1, a kind ofly is used for the combination method of photovoltaic combination inverter that AC side comprises transformer, it is characterized in that the direct voltage transducer being installed at inverter direct current input side, inverter exchanges outlet side A.C. contactor is installed, and with close grid side AC voltage sensor is installed all in the close transformer side of A.C. contactor; AC voltage sensor at first detects voltage magnitude, frequency and the phase place of inverter A.C. contactor both sides, and AC voltage sensor is handled the data of being gathered and moved in order to control inverter again by inverter control circuit; When direct current transducer detect reach the inverter lowest starting voltage point after, inverter independent operating at first under the situation that electrical network does not insert, A.C. contactor keeps disconnecting, all phase place and the amplitude with line voltage is consistent with phase place up to working as the amplitude of transformer near the voltage of electrical network one side, the adhesive of inverter control circuit control A.C. contactor begins to generate electricity by way of merging two or more grid systems; If transformer can't reach the line voltage value all the time near the amplitude of the alternating voltage of electrical network one side, or frequency and phase place all the time can't be synchronous fully with the frequency or the phase place of line voltage, inverter control circuit control A.C. contactor keeps off-state, the inverter work of not being incorporated into the power networks.
2, a kind of combination method of photovoltaic combination inverter that AC side comprises transformer that is used for according to claim 1, it is characterized in that describedly all with after the phase place of line voltage and amplitude are consistent keeping a period of time near the amplitude of the voltage of electrical network one side and phase place when transformer, inverter is controlled the A.C. contactor adhesive again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910144506A CN101621206A (en) | 2009-08-13 | 2009-08-13 | Combination method of photovoltaic combination inverter containing transformer at AC side |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910144506A CN101621206A (en) | 2009-08-13 | 2009-08-13 | Combination method of photovoltaic combination inverter containing transformer at AC side |
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| CN101621206A true CN101621206A (en) | 2010-01-06 |
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| CN200910144506A Pending CN101621206A (en) | 2009-08-13 | 2009-08-13 | Combination method of photovoltaic combination inverter containing transformer at AC side |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789606A (en) * | 2010-03-12 | 2010-07-28 | 合肥阳光电源有限公司 | Boosting method for synchronization without insulating photovoltaic grid-connected inverters |
| CN101950976A (en) * | 2010-08-25 | 2011-01-19 | 常熟开关制造有限公司(原常熟开关厂） | Grid-connected operation method of grid-connected type photovoltaic inverter |
| CN102522778A (en) * | 2012-01-07 | 2012-06-27 | 中国船舶重工集团公司第七一二研究所 | Grid connecting method of three-phase high-power inverter with power-frequency isolation transformer |
| CN102891503A (en) * | 2012-09-21 | 2013-01-23 | 深圳市英威腾电气股份有限公司 | Grid-connected startup method for photovoltaic grid-connected inverter |
| CN105490307A (en) * | 2016-02-05 | 2016-04-13 | 阳光电源股份有限公司 | Middle-high-voltage grid-connected power generation system, middle-high-voltage grid-connected system and control unit thereof |
| CN105490308A (en) * | 2016-02-05 | 2016-04-13 | 阳光电源股份有限公司 | Middle-high-voltage grid-connected system and middle-high-voltage grid-connected power generation system |
| CN107947236A (en) * | 2017-12-13 | 2018-04-20 | 江苏蓝天光伏科技有限公司 | A kind of energy-saving inversion boosting complexes and method for photovoltaic generation |
| US10103544B2 (en) | 2016-02-05 | 2018-10-16 | Sungrow Power Supply Co., Ltd. | Medium and high voltage grid-connected power generation system, medium and high voltage grid-connected system and control unit thereof |
-
2009
- 2009-08-13 CN CN200910144506A patent/CN101621206A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789606A (en) * | 2010-03-12 | 2010-07-28 | 合肥阳光电源有限公司 | Boosting method for synchronization without insulating photovoltaic grid-connected inverters |
| CN101789606B (en) * | 2010-03-12 | 2012-09-19 | 阳光电源股份有限公司 | Startup method for synchronization without insulating photovoltaic grid-connected inverters |
| CN101950976A (en) * | 2010-08-25 | 2011-01-19 | 常熟开关制造有限公司(原常熟开关厂） | Grid-connected operation method of grid-connected type photovoltaic inverter |
| CN101950976B (en) * | 2010-08-25 | 2012-11-28 | 常熟开关制造有限公司(原常熟开关厂） | Grid-connected operation method of grid-connected type photovoltaic inverter |
| CN102522778A (en) * | 2012-01-07 | 2012-06-27 | 中国船舶重工集团公司第七一二研究所 | Grid connecting method of three-phase high-power inverter with power-frequency isolation transformer |
| CN102891503B (en) * | 2012-09-21 | 2015-11-18 | 深圳市英威腾电气股份有限公司 | The grid-connected starting method of photovoltaic combining inverter |
| CN102891503A (en) * | 2012-09-21 | 2013-01-23 | 深圳市英威腾电气股份有限公司 | Grid-connected startup method for photovoltaic grid-connected inverter |
| CN105490307A (en) * | 2016-02-05 | 2016-04-13 | 阳光电源股份有限公司 | Middle-high-voltage grid-connected power generation system, middle-high-voltage grid-connected system and control unit thereof |
| CN105490308A (en) * | 2016-02-05 | 2016-04-13 | 阳光电源股份有限公司 | Middle-high-voltage grid-connected system and middle-high-voltage grid-connected power generation system |
| CN105490307B (en) * | 2016-02-05 | 2018-04-10 | 阳光电源股份有限公司 | Mesohigh grid-connected system, mesohigh grid-connected system and its control unit |
| US10103544B2 (en) | 2016-02-05 | 2018-10-16 | Sungrow Power Supply Co., Ltd. | Medium and high voltage grid-connected power generation system, medium and high voltage grid-connected system and control unit thereof |
| CN107947236A (en) * | 2017-12-13 | 2018-04-20 | 江苏蓝天光伏科技有限公司 | A kind of energy-saving inversion boosting complexes and method for photovoltaic generation |
| CN107947236B (en) * | 2017-12-13 | 2024-06-21 | 江苏蓝天光伏科技有限公司 | Energy-saving inversion boosting complete device and method for photovoltaic power generation |
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Application publication date: 20100106 |