CN104836470A - Grid-connected and grid-off inversion system - Google Patents
Grid-connected and grid-off inversion system Download PDFInfo
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- CN104836470A CN104836470A CN201510219919.4A CN201510219919A CN104836470A CN 104836470 A CN104836470 A CN 104836470A CN 201510219919 A CN201510219919 A CN 201510219919A CN 104836470 A CN104836470 A CN 104836470A
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- inversion system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a grid-connected and grid-off inversion system, and relates to the field of photovoltaic power generation. The invention aims at solving a problem that the service lifetime of an inverter can be greatly shortened due to frequent switching on/off. The system comprises a photovoltaic array, a grid-connected and grid-off inverter, a boosting transformer and a load device. The grid-connected and grid-off inverter comprises a box provided with an air inlet, an air outlet, an input terminal and an output terminal. The box is internally provided with a voltage detection circuit, an inversion drive circuit, an optical fiber conversion circuit, a peripheral detection circuit, a master control circuit, an inversion circuit and a fan. One end of the input terminal is connected to the photovoltaic array, and the other end of the input terminal is connected to the inversion circuit and the voltage detection circuit. The inversion circuit is connected to one end of the output terminal, the peripheral detection circuit and the inversion drive circuit. The optical fiber conversion circuit is connected to the inversion drive circuit and the master control circuit. The master control circuit is connected to the voltage detection circuit, the fan and the peripheral detection circuit. The other end of the output terminal is connected to the boosting transformer.
Description
Technical field
The present invention relates to field of photovoltaic power generation, particularly relate to one and from net inversion system.
Background technology
Inverter is the bridge that photovoltaic cell component is connected with AC network, is the core of photovoltaic generating system, and the height of its efficiency, the quality of reliability will directly affect the performance of whole photovoltaic generating system.The Starting mode of existing inverter is all generally by the switching on and shutting down that directly constantly make repeated attempts, and when photovoltaic array power output can meet the minimum power of invertor operation, inverter could normally run.But inverter is switching on and shutting down frequently, can serious curtailment its useful life.
Summary of the invention
The invention provides one and from net inversion system, inverter switching on and shutting down frequently can be avoided, thus extending the useful life of inverter.
Technical solution problem of the present invention adopts following technical scheme: the embodiment of the invention discloses one and from net inversion system, comprising:
Photovoltaic array from net inverter, step-up transformer and load device; Described and be connected with described step-up transformer with described photovoltaic array respectively from net inverter, described step-up transformer is also connected with described load device;
Described and comprise from net inverter: casing, described casing is provided with fresh air inlet, exhaust vent, input terminal and lead-out terminal; Voltage detecting circuit, inverse changing driving circuit, optical fiber changeover circuit, peripheral testing circuit, governor circuit, inverter circuit and fan is provided with in described casing;
The air outlet of described fan is just to described exhaust vent; One end of described input terminal is connected with described photovoltaic array, and the other end of described input terminal is connected with described voltage detecting circuit with described inverter circuit respectively; Described inverter circuit is connected with described inverse changing driving circuit with one end of described lead-out terminal, described peripheral testing circuit respectively; Described optical fiber changeover circuit is connected with described governor circuit with described inverse changing driving circuit respectively; Described governor circuit is connected with described peripheral testing circuit with described voltage detecting circuit, described fan respectively; The other end of described lead-out terminal is connected with described step-up transformer.
Optionally, that the embodiment of the present invention provides and from inverter circuit in net inversion system, comprising:
DC filter, three phase full bridge IGBT inverter, LC filter, three-phase transformer and alternating current filter;
The other end of described input terminal is connected with one end of described DC filter; The other end of described DC filter is connected with one end of described three phase full bridge IGBT inverter; The other end of described three phase full bridge IGBT inverter is connected with one end of described LC filter; The other end of described LC filter is connected with one end of described three-phase transformer; The other end of described three-phase transformer is connected with one end of described alternating current filter; The other end of described alternating current filter is connected with one end of described lead-out terminal.
Optionally, that the embodiment of the present invention provides and from inverter circuit in net inversion system, also comprise:
Communication lightning-protection device, one end of described communication lightning-protection device is connected between described alternating current filter and described lead-out terminal, other end ground connection.
Optionally, that the embodiment of the present invention provides and from inverter circuit in net inversion system, also comprise:
DC circuit breaker, described DC circuit breaker is connected between described input terminal and described DC filter.
Optionally, that the embodiment of the present invention provides and from inverter circuit in net inversion system, also comprise:
AC circuit breaker, described AC circuit breaker is connected between described alternating current filter and described lead-out terminal.
Optionally, that the embodiment of the present invention provides and from inverter circuit in net inversion system, described DC filter is direct solenoid compatibility filter.
Optionally, that the embodiment of the present invention provides and from inverter circuit in net inversion system, described alternating current filter is alternating electromagnetic compatibility filter.
Optionally, that the embodiment of the present invention provides and from net inversion system, described casing is also provided with emergency stop switch, described emergency stop switch is connected with described governor circuit.
Optionally, that the embodiment of the present invention provides and from net inversion system, described casing is also provided with touch-screen, described touch-screen is connected with described governor circuit.
Optionally, that the embodiment of the present invention provides and from net inversion system, described casing is also provided with at least one indicator light, at least one indicator light described is connected with described governor circuit.
The present invention has following beneficial effect: the present invention has following beneficial effect: the input voltage value that can be detected photovoltaic array by voltage detecting circuit, and governor circuit controls startup and the closedown of inverter circuit according to this input voltage value; Due to can when input voltage value be lower than predetermined threshold value, continue to close inverter circuit, until input voltage value is higher than threshold value, during this period without the need to starting frequently or closing inverter circuit, therefore the embodiment of the present invention provide and from net inversion system, solve the switching on and shutting down frequently of existing inverter, understand the problem in its useful life of serious curtailment.
Accompanying drawing explanation
Fig. 1 for the embodiment of the present invention 1 provide and from the structural representation of net inversion system;
Fig. 2 for shown in Fig. 1 and from the structural representation one of inverter circuit in net inversion system;
Fig. 3 for shown in Fig. 1 and from the structural representation two of inverter circuit in net inversion system;
Fig. 4 for shown in Fig. 1 and from the structural representation three of inverter circuit in net inversion system;
Fig. 5 for shown in Fig. 1 and from the structural representation four of inverter circuit in net inversion system.
Embodiment
Below in conjunction with embodiment and accompanying drawing, technical scheme of the present invention is further elaborated.
Embodiment 1
As shown in Figure 1, that the embodiment of the present invention provides and from net inversion system, comprising: photovoltaic array 00 from net inverter 10, step-up transformer 20 and load device 30; Described and be connected with described step-up transformer with described photovoltaic array respectively from net inverter, described step-up transformer is also connected with described load device; Described and comprise from net inverter: casing, described casing is provided with fresh air inlet, exhaust vent, input terminal and lead-out terminal; Voltage detecting circuit, inverse changing driving circuit, optical fiber changeover circuit, peripheral testing circuit, governor circuit, inverter circuit and fan is provided with in described casing; The air outlet of described fan is just to described exhaust vent.Wherein, one end of described input terminal 101 is connected with described photovoltaic array, and the other end of described input terminal is connected with described voltage detecting circuit 103 with described inverter circuit 102 respectively; Described inverter circuit is connected with described inverse changing driving circuit 106 with one end of described lead-out terminal 104, described peripheral testing circuit 105 respectively; Described optical fiber changeover circuit 107 is connected with described governor circuit 108 with described inverse changing driving circuit respectively; Described governor circuit is connected with described peripheral testing circuit with described voltage detecting circuit, described fan 109 respectively; The other end of described lead-out terminal is connected with described step-up transformer.
In the present embodiment, and the input voltage value of photovoltaic array can be detected by voltage detecting circuit from net inverter, governor circuit controls startup and the closedown of inverter circuit according to this input voltage value, and when inverter circuit carries out inversion, after carrying out isolation boosting by step-up transformer, export to load device.Wherein, when governor circuit controls inverter circuit, governor circuit sends corresponding control signal to optical fiber changeover circuit, after control signal is converted to corresponding fiber-optic signal by optical fiber changeover circuit, send to inverse changing driving circuit, inverse changing driving circuit drives inverter circuit according to this fiber-optic signal, controls the inversion of inverter circuit.Especially, the voltage that control circuit can also detect according to voltage detecting circuit, the voltage and current that peripheral testing circuit detects, adopt the technology such as SPWM pulse-width modulation, maximal power tracing technology MPPT to control inverter circuit, this is no longer going to repeat them.
Further, as shown in Figure 2, that the present embodiment provides and from net inverter, inverter circuit 102 comprises:
DC filter 1021, three phase full bridge IGBT inverter 1022, LC filter 1023, three-phase transformer 1024 and alternating current filter 1025; Wherein, the other end of described input terminal is connected with one end of described DC filter; The other end of described DC filter is connected with one end of described three phase full bridge IGBT inverter; The other end of described three phase full bridge IGBT inverter is connected with one end of described LC filter; The other end of described LC filter is connected with one end of described three-phase transformer; The other end of described three-phase transformer is connected with one end of described alternating current filter; The other end of described alternating current filter is connected with one end of described lead-out terminal.
Now, in order to realize lightning protection, as shown in Figure 3; that the present embodiment provides and from inverter circuit in net inverter; also comprise: communication lightning-protection device 1026, one end of described communication lightning-protection device is connected between described alternating current filter and described lead-out terminal, other end ground connection.
Now, in order to prevent user from getting an electric shock when installing inverter, as shown in Figure 4, that the present embodiment provides and from inverter circuit in net inverter, also comprise: DC circuit breaker 1027, described DC circuit breaker is connected between described input terminal and described DC filter.
Now, in order to prevent user from getting an electric shock when installing inverter, as shown in Figure 5, that the present embodiment provides and from inverter circuit in net inverter, also comprise: AC circuit breaker 1028, described AC circuit breaker is connected between described alternating current filter and described lead-out terminal.
Especially, in order to prevent electromagnetic interference, in inverter circuit, DC filter can be direct solenoid compatibility filter; Alternating current filter can be alternating electromagnetic compatibility filter.
In the present embodiment, when user need to install inverter circuit, safeguard time, can be disconnected by DC circuit breaker and AC circuit breaker, prevent equipment live from working the mischief to user; Especially, during owing to being disconnected by circuit by DC circuit breaker and AC circuit breaker, still there is electricity in electric capacity, therefore should wait for a period of time after ensureing capacitor discharge and carry out installing, safeguarding.
In the present embodiment, filtered DC power conversion, after DC filter filtering, is the three-phase alternating current of high frequency by three phase full bridge IGBT inverter by the direct current of DC input terminal input; This three-phase alternating current, after LC filter filtering, after three-phase transformer isolation boosting, exports through alternating current filter filtering.Wherein, three phase full bridge IGBT inverter comprises driver module and inversion module, and driver module is connected with inverse changing driving circuit, and its inversion module is made up of electrochemical capacitor and igbt, and concrete annexation is as shown in Fig. 2-5 1022; LC filter is made up of three inductance and three electric capacity, and concrete annexation is as shown in Fig. 2-5 1023.
Further, that the present embodiment provides and from net inverter, described casing can also be provided with emergency stop switch, described emergency stop switch is connected with described governor circuit; User can pass through this emergency stop switch emergency cut-off inverter.Described casing can also be provided with touch-screen, and described touch-screen is connected with described governor circuit; User can check the parameter of inverter by touch-screen, and is controlled inverter by touch-screen.Described casing can also be provided with at least one indicator light, and at least one indicator light described is connected with described governor circuit; The operating state of inverter can be indicated, as abnormal operation etc. by indicator light.
The present invention has following beneficial effect: the input voltage value that can be detected photovoltaic array by voltage detecting circuit, and governor circuit controls startup and the closedown of inverter circuit according to this input voltage value; Due to can when input voltage value be lower than predetermined threshold value, continue to close inverter circuit, until input voltage value is higher than threshold value, during this period without the need to starting frequently or closing inverter circuit, therefore the embodiment of the present invention provide and from net inversion system, solve the switching on and shutting down frequently of existing inverter, understand the problem in its useful life of serious curtailment.
The sequencing of above embodiment, only for ease of describing, does not represent the quality of embodiment.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. and from a net inversion system, it is characterized in that, comprising:
Photovoltaic array from net inverter, step-up transformer and load device; Described and be connected with described step-up transformer with described photovoltaic array respectively from net inverter, described step-up transformer is also connected with described load device;
Described and comprise from net inverter: casing, described casing is provided with fresh air inlet, exhaust vent, input terminal and lead-out terminal; Voltage detecting circuit, inverse changing driving circuit, optical fiber changeover circuit, peripheral testing circuit, governor circuit, inverter circuit and fan is provided with in described casing;
The air outlet of described fan is just to described exhaust vent; One end of described input terminal is connected with described photovoltaic array, and the other end of described input terminal is connected with described voltage detecting circuit with described inverter circuit respectively; Described inverter circuit is connected with described inverse changing driving circuit with one end of described lead-out terminal, described peripheral testing circuit respectively; Described optical fiber changeover circuit is connected with described governor circuit with described inverse changing driving circuit respectively; Described governor circuit is connected with described peripheral testing circuit with described voltage detecting circuit, described fan respectively; The other end of described lead-out terminal is connected with described step-up transformer.
2. according to claim 1 and from net inversion system, it is characterized in that, described inverter circuit, comprising:
DC filter, three phase full bridge IGBT inverter, LC filter, three-phase transformer and alternating current filter;
The other end of described input terminal is connected with one end of described DC filter; The other end of described DC filter is connected with one end of described three phase full bridge IGBT inverter; The other end of described three phase full bridge IGBT inverter is connected with one end of described LC filter; The other end of described LC filter is connected with one end of described three-phase transformer; The other end of described three-phase transformer is connected with one end of described alternating current filter; The other end of described alternating current filter is connected with one end of described lead-out terminal.
3. according to claim 2 and from net inversion system, it is characterized in that, described inverter circuit, also comprises:
Communication lightning-protection device, one end of described communication lightning-protection device is connected between described alternating current filter and described lead-out terminal, other end ground connection.
4. according to claim 2 and from net inversion system, it is characterized in that, described inverter circuit, also comprises:
DC circuit breaker, described DC circuit breaker is connected between described input terminal and described DC filter.
5. according to claim 2 and from net inversion system, it is characterized in that, described inverter circuit, also comprises:
AC circuit breaker, described AC circuit breaker is connected between described alternating current filter and described lead-out terminal.
6. as claimed in any of claims 2 to 5 and from net inversion system, it is characterized in that, described DC filter is direct solenoid compatibility filter.
7. as claimed in any of claims 2 to 5 and from net inversion system, it is characterized in that, described alternating current filter is alternating electromagnetic compatibility filter.
It is 8. as claimed in any of claims 1 to 5 and from net inversion system, it is characterized in that,
Described casing is also provided with emergency stop switch, and described emergency stop switch is connected with described governor circuit.
It is 9. as claimed in any of claims 1 to 5 and from net inversion system, it is characterized in that,
Described casing is also provided with touch-screen, and described touch-screen is connected with described governor circuit.
It is 10. as claimed in any of claims 1 to 5 and from net inversion system, it is characterized in that,
Described casing is also provided with at least one indicator light, and at least one indicator light described is connected with described governor circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510219919.4A CN104836470A (en) | 2015-04-30 | 2015-04-30 | Grid-connected and grid-off inversion system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510219919.4A CN104836470A (en) | 2015-04-30 | 2015-04-30 | Grid-connected and grid-off inversion system |
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| Publication Number | Publication Date |
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| CN104836470A true CN104836470A (en) | 2015-08-12 |
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| CN201510219919.4A Pending CN104836470A (en) | 2015-04-30 | 2015-04-30 | Grid-connected and grid-off inversion system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120051099A1 (en) * | 2010-08-31 | 2012-03-01 | Hitachi Automotive Systems, Ltd. | Power Supply Circuit and Power Conversion Device |
| CN103475236A (en) * | 2013-08-01 | 2013-12-25 | 深圳市英威腾交通技术有限公司 | Tractive current transformer |
| CN204290348U (en) * | 2014-12-26 | 2015-04-22 | 山东博奥斯能源科技有限公司 | A kind of blower fan combining inverter of setting power curve |
| CN204578397U (en) * | 2015-04-30 | 2015-08-19 | 祥天控股（集团）有限公司 | And from net inversion system |
-
2015
- 2015-04-30 CN CN201510219919.4A patent/CN104836470A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120051099A1 (en) * | 2010-08-31 | 2012-03-01 | Hitachi Automotive Systems, Ltd. | Power Supply Circuit and Power Conversion Device |
| CN103475236A (en) * | 2013-08-01 | 2013-12-25 | 深圳市英威腾交通技术有限公司 | Tractive current transformer |
| CN204290348U (en) * | 2014-12-26 | 2015-04-22 | 山东博奥斯能源科技有限公司 | A kind of blower fan combining inverter of setting power curve |
| CN204578397U (en) * | 2015-04-30 | 2015-08-19 | 祥天控股（集团）有限公司 | And from net inversion system |
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| CB03 | Change of inventor or designer information |
Inventor after: Zhou Dengrong Inventor after: Zhou Jian Inventor before: Zhou Rongdeng Inventor before: Zhou Jian |
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20150812 |