CN104852681A - Solar inverter system - Google Patents
Solar inverter system Download PDFInfo
- Publication number
- CN104852681A CN104852681A CN201510217331.5A CN201510217331A CN104852681A CN 104852681 A CN104852681 A CN 104852681A CN 201510217331 A CN201510217331 A CN 201510217331A CN 104852681 A CN104852681 A CN 104852681A
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- Prior art keywords
- circuit
- inverter
- filter
- solar energy
- inversion system
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 13
- 239000013307 optical fiber Substances 0.000 claims abstract description 10
- 238000004891 communication Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000010248 power generation Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 abstract 6
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
-
- 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
Abstract
The invention discloses a solar inverter system, and relates to the field of photovoltaic power generation. The solar inverter system is invented to solve the problem that the service life of an inverter may be shortened seriously due to frequent startup and shutdown. The solar inverter system comprises a photovoltaic array, a solar inverter, a step-up transformer, and a load device. The solar inverter comprises a box body which is provided with an air inlet hole, an air outlet hole, a first input terminal, a second input terminal and an output terminal. A voltage detection circuit, an inverter driving circuit, an optical fiber conversion circuit, a peripheral detection circuit, a main control circuit, an inverter circuit and a fan are arranged inside the box body. The air outlet of the fan directly faces the air outlet hole. The first input terminal and the second input terminal are respectively connected with the inverter circuit and the voltage detection circuit. The inverter circuit is connected with the output terminal, the peripheral detection circuit and the inverter driving circuit. The optical fiber conversion circuit is connected with the inverter driving circuit and the main control circuit. The main control circuit is connected with the voltage detection circuit, the fan and the peripheral detection circuit.
Description
Technical field
The present invention relates to field of photovoltaic power generation, particularly relate to a kind of solar energy 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 a kind of solar energy inversion system, inverter switching on and shutting down frequently can be avoided, thus extend the useful life of inverter.
Technical solution problem of the present invention adopts following technical scheme: the embodiment of the invention discloses a kind of solar energy inversion system, comprising:
Photovoltaic array, solar inverter, step-up transformer and load device; Described solar inverter is connected with described step-up transformer with described photovoltaic array respectively, and described step-up transformer is also connected with described load device;
Described solar inverter comprises: casing, and described casing is provided with fresh air inlet, exhaust vent, first input end, the second 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; Described first input end is connected with described voltage detecting circuit with described inverter circuit respectively with the second input terminal; Described inverter circuit is connected with described inverse changing driving circuit with described lead-out terminal, 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.
Optionally, inverter circuit in the solar energy inversion system that the embodiment of the present invention provides, comprising:
First DC filter, the second DC filter, three phase full bridge IGBT inverter, LCL filter, alternating current filter and AC output terminal;
One end of described first input end is connected with one end of described first DC filter; One end of described second input terminal is connected with one end of described second DC filter; The other end of described first DC filter is connected with one end of described three phase full bridge IGBT inverter respectively with the other end of described second DC filter; The other end of described three phase full bridge IGBT inverter is connected with one end of described LCL filter; The other end of described LCL filter is connected with one end of described alternating current filter; The other end of described alternating current filter is connected with described AC output terminal.
Optionally, inverter circuit in the solar energy inversion system that the embodiment of the present invention provides, also comprises:
Communication lightning-protection device, one end of described communication lightning-protection device is connected between described alternating current filter and described AC output terminal, other end ground connection.
Optionally, inverter circuit in the solar energy inversion system that the embodiment of the present invention provides, also comprises:
First DC circuit breaker, described first DC circuit breaker is connected between described first DC input terminal and described first DC filter; And/or
Second DC circuit breaker, described second DC circuit breaker is connected between described second DC input terminal and described second DC filter.
Optionally, inverter circuit in the solar energy inversion system that the embodiment of the present invention provides, also comprises:
AC circuit breaker, described AC circuit breaker is connected between described alternating current filter and described AC output terminal.
Optionally, inverter circuit in the solar energy inversion system that the embodiment of the present invention provides, also comprises:
A.C. contactor, described A.C. contactor is connected between described LCL filter and described alternating current filter.
Optionally, in the solar energy inversion system that the embodiment of the present invention provides in inverter circuit,
Described first DC filter and/or the second DC filter are direct solenoid compatibility filter;
Described alternating current filter is alternating electromagnetic compatibility filter.
Optionally, the solar energy inversion system that the embodiment of the present invention provides, described casing is also provided with emergency stop switch, and described emergency stop switch is connected with described governor circuit.
Optionally, the solar energy inversion system that the embodiment of the present invention provides, described casing is also provided with touch-screen, and described touch-screen is connected with described governor circuit.
Optionally, the solar energy inversion system that the embodiment of the present invention provides, described casing is also provided with at least one indicator light, and 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 solar energy inversion system that provides of the embodiment of the present invention, solve the switching on and shutting down frequently of existing inverter, understand the problem in its useful life of serious curtailment.
Accompanying drawing explanation
The structural representation of the solar energy inversion system that Fig. 1 provides for the embodiment of the present invention 1;
Fig. 2 is the structural representation one of inverter circuit in the solar energy inversion system shown in Fig. 1;
Fig. 3 is the structural representation two of inverter circuit in the solar energy inversion system shown in Fig. 1;
Fig. 4 is the structural representation three of inverter circuit in the solar energy inversion system shown in Fig. 1;
Fig. 5 is the structural representation four of inverter circuit in the solar energy inversion system shown in Fig. 1;
Fig. 6 is the structural representation five of inverter circuit in the solar energy inversion system shown in Fig. 1.
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, the solar energy inversion system that the embodiment of the present invention provides, comprising: photovoltaic array 00, solar inverter 10, step-up transformer 20 and load device 30; Described solar inverter is connected with described step-up transformer with described photovoltaic array respectively, and described step-up transformer is also connected with described load device; Described solar inverter comprises: casing, and described casing is provided with fresh air inlet, exhaust vent, first input end, the second 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; First input end 101 is connected with described voltage detecting circuit 103 with described inverter circuit 102 respectively with the second input terminal 110; Described inverter circuit 102 is connected with described inverse changing driving circuit 106 with described lead-out terminal 104, peripheral testing circuit 105 respectively; Described optical fiber changeover circuit 107 is connected with described governor circuit 108 with described inverse changing driving circuit 106 respectively; Described governor circuit 108 is connected with peripheral testing circuit 105 with described voltage detecting circuit 103, described fan 109 respectively.
In the present embodiment, solar inverter can be connected photovoltaic array by first input end with the second input terminal, accesses electrical network after connecting external three-phase transformer isolation boosting by lead-out terminal; Solar inverter can detect the input voltage value of photovoltaic array by voltage detecting circuit, governor circuit controls startup and the closedown of inverter circuit according to this input voltage value; 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.
First DC filter 1021, second DC filter 1022, three phase full bridge IGBT inverter 1023, LCL filter 1024, alternating current filter 1025 and AC output terminal 1026.Wherein, one end of described first input end is connected with one end of described first DC filter; One end of described second input terminal is connected with one end of described second DC filter; The other end of described first DC filter is connected with one end of described three phase full bridge IGBT inverter respectively with the other end of described second DC filter; The other end of described three phase full bridge IGBT inverter is connected with one end of described LCL filter; The other end of described LCL filter is connected with one end of described alternating current filter; The other end of described alternating current filter is connected with described AC output terminal.
Now, in order to realize lightning protection, as shown in Figure 3; inverter circuit in the solar inverter that the present embodiment provides; also comprise: communication lightning-protection device 1027, one end of described communication lightning-protection device is connected between described alternating current filter and described AC output terminal, other end ground connection.
Now, get an electric shock when installing inverter to prevent user, as shown in Figure 4, inverter circuit in the solar inverter that the present embodiment provides, also comprise: the first DC circuit breaker 1028, described first DC circuit breaker is connected between described first DC input terminal and described first DC filter; And/or second DC circuit breaker 1029, described second DC circuit breaker is connected between described second DC input terminal and described second DC filter.
Now, in order to prevent user from getting an electric shock when installing inverter, as shown in Figure 5, inverter circuit in the solar inverter that the present embodiment provides, also comprise: AC circuit breaker 1030, described AC circuit breaker is connected between described alternating current filter and described AC output terminal.
Especially, in order to prevent electromagnetic interference, the first DC filter described in inverter circuit and/or the second DC filter are direct solenoid compatibility filter; Described alternating current filter is alternating electromagnetic compatibility filter.
Further, in order to realize overload protection, as shown in Figure 6, the inverter circuit in the solar inverter that the present embodiment provides, also comprises: A.C. contactor 1031, and described A.C. contactor is connected between described LCL filter and described alternating current filter.
In the present embodiment, when user need to install inverter, safeguard time, the first DC circuit breaker, the second DC circuit breaker and AC circuit breaker can be passed through and disconnect, prevent equipment live from working the mischief to user; Especially, during owing to being disconnected by circuit by the first DC circuit breaker, the second 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 LCL filter filtering, exports through alternating current filter filtering; After the inversion of above-mentioned solar energy inverter circuit, by the generating that is connected to the grid after external three-phase transformer isolation boosting.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 insulated gate bipolar transistor IGBT, and concrete annexation is as shown in Fig. 2-6 1023; LCL filter is made up of six inductance and three electric capacity, and concrete annexation is as shown in Fig. 2-6 1024.
Further, solar inverter in the solar energy inversion system that the present embodiment provides, described casing can also be provided with emergency stop switch, and 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 solar energy inversion system that provides of the embodiment of the present invention, 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. a solar energy inversion system, is characterized in that, comprising:
Photovoltaic array, solar inverter, step-up transformer and load device; Described solar inverter is connected with described step-up transformer with described photovoltaic array respectively, and described step-up transformer is also connected with described load device;
Described solar inverter comprises: casing, and described casing is provided with fresh air inlet, exhaust vent, first input end, the second 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; Described first input end is connected with described voltage detecting circuit with described inverter circuit respectively with the second input terminal; Described inverter circuit is connected with described inverse changing driving circuit with described lead-out terminal, 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.
2. solar energy inversion system according to claim 1, is characterized in that, described inverter circuit, comprising:
First DC filter, the second DC filter, three phase full bridge IGBT inverter, LCL filter, alternating current filter and AC output terminal;
One end of described first input end is connected with one end of described first DC filter; One end of described second input terminal is connected with one end of described second DC filter; The other end of described first DC filter is connected with one end of described three phase full bridge IGBT inverter respectively with the other end of described second DC filter; The other end of described three phase full bridge IGBT inverter is connected with one end of described LCL filter; The other end of described LCL filter is connected with one end of described alternating current filter; The other end of described alternating current filter is connected with described AC output terminal.
3. solar energy inversion system according to claim 2, 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 AC output terminal, other end ground connection.
4. solar energy inversion system according to claim 2, is characterized in that, described inverter circuit, also comprises:
First DC circuit breaker, described first DC circuit breaker is connected between described first DC input terminal and described first DC filter; And/or
Second DC circuit breaker, described second DC circuit breaker is connected between described second DC input terminal and described second DC filter.
5. solar energy inversion system according to claim 2, 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 AC output terminal.
6. solar energy inversion system as claimed in any of claims 2 to 5, is characterized in that, described inverter circuit, also comprises:
A.C. contactor, described A.C. contactor is connected between described LCL filter and described alternating current filter.
7. solar energy inversion system as claimed in any of claims 2 to 5, is characterized in that,
Described first DC filter and/or the second DC filter are direct solenoid compatibility filter;
Described alternating current filter is alternating electromagnetic compatibility filter.
8. solar energy inversion system as claimed in any of claims 1 to 5, is characterized in that,
Described casing is also provided with emergency stop switch, and described emergency stop switch is connected with described governor circuit.
9. solar energy inversion system as claimed in any of claims 1 to 5, is characterized in that,
Described casing is also provided with touch-screen, and described touch-screen is connected with described governor circuit.
10. solar energy inversion system as claimed in any of claims 1 to 5, 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 |
|---|---|---|---|
| CN201510217331.5A CN104852681A (en) | 2015-04-30 | 2015-04-30 | Solar inverter system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510217331.5A CN104852681A (en) | 2015-04-30 | 2015-04-30 | Solar inverter system |
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| CN104852681A true CN104852681A (en) | 2015-08-19 |
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| CN201510217331.5A Pending CN104852681A (en) | 2015-04-30 | 2015-04-30 | Solar inverter system |
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Cited By (1)
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Inventor after: Zhou Dengrong Inventor after: Zhou Jian Inventor before: Zhou Rongdeng Inventor before: Zhou Jian |
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Application publication date: 20150819 |