CN202197235U - Solar photovoltaic system - Google Patents
Solar photovoltaic system Download PDFInfo
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- CN202197235U CN202197235U CN2011203073326U CN201120307332U CN202197235U CN 202197235 U CN202197235 U CN 202197235U CN 2011203073326 U CN2011203073326 U CN 2011203073326U CN 201120307332 U CN201120307332 U CN 201120307332U CN 202197235 U CN202197235 U CN 202197235U
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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
Abstract
The utility model provides a solar photovoltaic system, which comprises a plurality of photovoltaic assemblies, a plurality of micro optimizers, a managing device and an inverter. The plurality of photovoltaic assemblies are used for collecting solar energy to produce direct current. The input ends of the plurality of micro optimizers are connected with all photovoltaic assemblies respectively, and the output ends of the micro optimizers are connected with each other in series for optimizing output current and/or output voltage of each photovoltaic assembly so as to produce maximum power. The managing device communicates with the plurality of the micro optimizers and is used for managing working state of each micro optimizer. The inverter is connected with a string or a plurality of strings of micro optimizers and used for converting optimized direct current into alternating current to be combined with grids to be output. The solar photovoltaic system collects the maximum power produced by each photovoltaic assembly to output fixed direct current voltage, and photovoltaic assemblies of different models and rated power or even photovoltaic assemblies made by different factories and made of different materials can be used in the same photovoltaic system.
Description
Technical field
The utility model relates to the solar-photovoltaic technology field, and specifically, the utility model relates to a kind of solar energy photovoltaic system.
Background technology
Solar photovoltaic assembly is imported inverter after connecting usually and improving voltage, and the generation alternating current is connected to the grid or charger uses.The output current of the photovoltaic module of series connection is limited by the photovoltaic module of minimum current, and can not obtain maximum energy from each photovoltaic module.
The output voltage of photovoltaic module changes with illumination condition, and scope is very big.Now common inverter design is for can support input voltage on a large scale.Because conversion efficiency changes with the variation of input voltage, the overall conversion efficiency ratio of inverter is low optimum voltage point.In addition, big input voltage change can increase the stress of element, influences the reliability and the life-span of inverter.
The maintenance of series connection photovoltaic system is difficulty very also, and the inefficacy of any one photovoltaic module can cause the component failures of bunchiness, confirms the operational difficulties of failed component and cost is high.
Summary of the invention
The utility model technical problem to be solved provides a kind of solar energy photovoltaic system, can export fixing direct voltage, simultaneously the energy acquisition of each solar photovoltaic assembly is optimized, and produces maximum power.
For solving the problems of the technologies described above, the utility model provides a kind of solar energy photovoltaic system, comprising:
A plurality of photovoltaic modulies are used to gather solar energy and produce direct current;
A plurality of little optimizers, its input are connected with each photovoltaic module respectively and its output is one another in series is connected, and is used for the output current and/or the output voltage of said each photovoltaic module are optimized, to produce maximum power;
Manager is communicated by letter with said a plurality of little optimizers, is used to manage the operating state of each said little optimizer; And
Inverter with a string or go here and there said little optimizer more and be connected, is used for converting the direct current after optimizing into the alternating current output of being incorporated into the power networks.
Alternatively, said little optimizer comprises:
Input detecting circuit is connected with the input of said little optimizer, is used to detect the electric current and/or the voltage parameter that are input to said little optimizer;
Output detection circuit is connected with the output of said little optimizer, is used to detect the electric current and/or the voltage parameter of the said little optimizer of output;
The MPPT maximum power point tracking circuit is connected with said input detecting circuit, is used for according to the electric current and/or the voltage parameter that are input to said little optimizer said photovoltaic module being done MPPT maximum power point tracking electric current and/or voltage control requirement that generation needs;
Control circuit is connected with said input detecting circuit, output detection circuit and MPPT maximum power point tracking circuit respectively, is used for requiring to produce control signal according to said electric current and/or voltage control;
Power conversion circuit is connected with input, output and the said control circuit of said little optimizer respectively, is used to receive said control signal, and the input current from said photovoltaic module is boosted or the step-down conversion; And
Telecommunication circuit; Be connected with control circuit with said output detection circuit respectively; Be used to receive the supervisory instruction of said manager and be transmitted to said control circuit, perhaps give said manager input current, input voltage, input power, output current, output voltage, power output or little optimizer Temperature Feedback.
Alternatively, the shared said manager of the said little optimizer of going here and there more, perhaps each is gone here and there said little optimizer and uses a said manager respectively.
Alternatively, said manager is communicated by letter with said little optimizer through wireless communication technology or power line communication technology.
For solving the problems of the technologies described above, the utility model also provides a kind of energy acquisition optimization method of solar energy photovoltaic system, comprises step:
A. manager reads the string output voltage that the little optimizer of every string needs respectively;
B. said little optimizer is done MPPT maximum power point tracking to photovoltaic module, makes said photovoltaic module that maximum power is provided;
C. said little optimizer detects input current and/or input voltage parameter, and calculates the input power that obtains;
D. said little optimizer calculates the power output that obtains according to said input power;
E. all little optimizers are sent to said manager with said power output;
F. said manager is according to the numbering of said little optimizer, and the data of said power output are divided into one group of every string;
G. said manager calculates the summation of the little optimizer power output of every string;
H. the summation that will work as the said power output of time summation of the said power output of time acquisition and last time acquisition compares, and is not more than a threshold value if change, and returns above-mentioned steps E, otherwise entering step I;
I. said manager calculates the string output current that the said little optimizer of every string needs;
J. said manager is sent to the corresponding said little optimizer of each photovoltaic module with the string output current of said needs, as supervisory instruction;
K. said little optimizer receives said supervisory instruction, controls its power conversion circuit and does the DC-to-dc conversion, makes said string output current reach requirement;
L. return above-mentioned steps B, said process circulation is carried out.
Alternatively, the said little optimizer output Power Calculation formula of every string is:
Po(T)＝k*Pi(T)
Wherein, Po (T) is the power output of the said little optimizer of every string, and Pi (T) is the input power of the said little optimizer of every string, the power conversion efficiency of k for setting.
Alternatively, said power conversion efficiency is one near 1 constant, perhaps is the variable of the input power of the said little optimizer of every string.
Alternatively, the computing formula of the string output current of the said little optimizer needs of every string is:
Im(T)＝Pm(T)/Vc
Wherein, Im (T) is the string output current that the said little optimizer of every string needs, and Pm (T) is the summation of the little optimizer power output of every string, and Vc is the string output voltage that the said little optimizer of every string needs.
Alternatively, the string output voltage that the said little optimizer of every string needs be the manual said manager of input, and perhaps the inverter that links to each other with the said little optimizer of every string of detection or direct current network obtain automatically by said manager.
For solving the problems of the technologies described above, the utility model also provides a kind of fault detection method of solar energy photovoltaic system, comprises step:
A. each little optimizer sends separately input parameter, output parameter to manager;
B. said manager is handled said output parameter and is performed an analysis;
C. it is no abnormal to judge that said output parameter has, if said output parameter is no abnormal, then returns above-mentioned steps b, otherwise gets into steps d;
D. said manager is handled said input parameter and is performed an analysis;
E. it is no abnormal to judge that said input parameter has, if said input parameter is no abnormal, assert that then said little optimizer has fault, otherwise assert that the photovoltaic module that is attached thereto has fault;
F. send fault alarm information.
Alternatively, said input parameter, output parameter comprise: the input current of said each little optimizer, input voltage, input power, output current, output voltage and power output.
Compared with prior art, the utlity model has following advantage:
The solar energy photovoltaic system of the utility model is gathered the maximum power that each photovoltaic module produces, and can in same photovoltaic system, use the photovoltaic module of different model and rated power even different vendor and material.
The utility model allows photovoltaic module to be installed under the different condition, like illumination, temperature, angle etc., simplifies the design of photovoltaic system.
The output voltage of the little optimizer string of the utility model can freely be provided with according to different system requirements, and the fixedly direct voltage to inverter output can freely be set, and optimizes the performance of inverter.
The performance and the fault of all right each photovoltaic module of detection at any time of the utility model and little optimizer.
Description of drawings
The utility model above-mentioned and other characteristic, character and advantage will become more obvious through the description below in conjunction with accompanying drawing and embodiment, wherein:
Fig. 1 is the modular structure sketch map of the solar energy photovoltaic system of an embodiment of the utility model;
Fig. 2 is the internal module structural representation of little optimizer of the solar energy photovoltaic system of an embodiment of the utility model;
Fig. 3 is the flow chart of energy acquisition optimization method of the solar energy photovoltaic system of an embodiment of the utility model;
Fig. 4 is the flow chart of fault detection method of the solar energy photovoltaic system of an embodiment of the utility model.
Embodiment
Below in conjunction with specific embodiment and accompanying drawing the utility model is described further; Set forth more details in the following description so that make much of the utility model; But the utility model obviously can be implemented with multiple this description ground alternate manner that is different from; Therefore those skilled in the art can do similar popularization, deduction according to practical situations under the situation of the utility model intension, should be with the protection range of content constraints the utility model of this specific embodiment.
Fig. 1 is the modular structure sketch map of the solar energy photovoltaic system of an embodiment of the utility model.As shown in the figure, this solar energy photovoltaic system 100 can comprise a plurality of photovoltaic module 101, a plurality of little optimizer 102, manager 103 and inverter 104.Wherein, a plurality of photovoltaic modulies 101 are used to gather solar energy generation direct current; The input of a plurality of little optimizers 102 is connected with each photovoltaic module 101 respectively and its output is one another in series is connected, and is used for the output current and/or the output voltage of each photovoltaic module 101 are optimized, to produce maximum power; Manager 103 is communicated by letter with a plurality of little optimizers 102, is used to manage the operating state of each little optimizer 102; Inverter 104 is with a string or go here and there little optimizer 102 more and be in parallel and be connected, and is used for converting the direct current after optimizing into the alternating current output of being incorporated into the power networks.Manager 103 can be communicated by letter with little optimizer 102 through wireless communication technology or power line communication technology.Can go here and there little optimizer 102 shared platform managers 103, perhaps each is gone here and there little optimizer 102 and uses a platform manager 103 respectively more.Little optimizer 102 is output as the direct current of fixed voltage, also can directly connect direct current network, supplies dc electric apparatus to use.
Fig. 2 is the internal module structural representation of little optimizer of the solar energy photovoltaic system of an embodiment of the utility model.As shown in the figure, this little optimizer 102 can comprise input detecting circuit 201, output detection circuit 202, MPPT maximum power point tracking circuit 203, control circuit 204, power conversion circuit 205 and telecommunication circuit 206.Wherein, input detecting circuit 201 is connected with the input of little optimizer 102, is used to detect the electric current and/or the voltage parameter that are input to little optimizer 102; Output detection circuit 202 is connected with the output of little optimizer 102, is used to detect the electric current and/or the voltage parameter of the little optimizer 102 of output; MPPT maximum power point tracking circuit 203 is connected with input detecting circuit 201, is used for according to the electric current and/or the voltage parameter that are input to little optimizer 102 photovoltaic module 101 being done MPPT maximum power point tracking electric current and/or voltage control requirement that generation needs; Control circuit 204 is connected with input detecting circuit 201, output detection circuit 202 and MPPT maximum power point tracking circuit 203 respectively, is used for requiring to produce control signal according to electric current and/or voltage control; Power conversion circuit 205 is connected with input, output and the control circuit 204 of little optimizer 102 respectively, is used to receive control signal, and the input current from photovoltaic module 101 is boosted or the step-down conversion; Telecommunication circuit 206 is connected with control circuit 204 with output detection circuit 202 respectively; Be used for the supervisory instruction of receiving management device 103 and be transmitted to control circuit 204; Perhaps data are fed back to manager 103, comprise input current, input voltage, input power, output current, output voltage, power output or little optimizer temperature etc.
In the present embodiment, little optimizer 102 is realized maximum input power through the annular control of input detecting circuit 201, power conversion circuit 205, output detection circuit 202, control circuit 204 and MPPT maximum power point tracking circuit 203.Similarly, little optimizer 102 makes the output valve that output current reaches to be needed through the annular control of output detection circuit 202, control circuit 204, power conversion circuit 205.
Fig. 3 is the flow chart of energy acquisition optimization method of the solar energy photovoltaic system of an embodiment of the utility model.As shown in the figure, the energy acquisition optimization method of this solar energy photovoltaic system can comprise step:
Execution in step S301, manager 103 read the string output voltage V c that the little optimizer 102 of every string needs respectively; Wherein this string output voltage V c is the input voltage of the inverter that connects, the perhaps voltage of the direct current network that connects; This string output voltage V c can be manual input manager 103, perhaps by manager 103 detect automatically the inverter 104 that links to each other with the little optimizer 102 of every string perhaps direct current network obtain;
Execution in step S302,102 pairs of photovoltaic modulies 101 of little optimizer are done MPPT maximum power point tracking, make photovoltaic module 101 that maximum power is provided;
Execution in step S303, little optimizer 102 detects input current and/or input voltage parameter, and the input power Pi (T) of calculating acquisition, and T is for working as time time of detection;
Execution in step S304, little optimizer 102 calculates the little optimizer 102 power output Po (T) of every string that obtain according to input power Pi (T), and its concrete computing formula is:
Po(T)＝k*Pi(T)
Wherein, Po (T) is the power output of the little optimizer 102 of every string, and Pi (T) is the input power of the little optimizer 102 of every string, and the power conversion efficiency of k for setting is generally one near 1 constant or be the variable of the input power Pi (T) of the little optimizer 102 of every string;
Execution in step S305, all little optimizers 102 are sent to manager 103 with power output Po (T);
The numbering of execution in step S306, manager 103 little optimizer 102 of storage when solar energy photovoltaic system 100 is installed is divided into one group of every string with the data of power output Po (T);
Execution in step S307, manager 103 calculates summation Pm (T)=sum (Po (T)) of the little optimizer 102 power output Po (T) of every string;
Execution in step S308; The summation Pm (T-1) that will work as time summation Pm (T) of the power output of T acquisition detection time and the power output that last time T-1 obtains compares; Be not more than a threshold value A if change, execution in step S309, little optimizer 102 keeps primary current control; Return above-mentioned steps S305 then, otherwise get into step S310;
Execution in step S310, manager 103 calculate the string output current Im (T) that the little optimizer 102 of every string needs, and its concrete computing formula is:
Im(T)＝Pm(T)/Vc
Wherein, Im (T) is the string output current that the little optimizer 102 of every string needs, and Pm (T) is the summation of the little optimizer 102 power output Po (T) of every string, and Vc is the string output voltage that the little optimizer 102 of every string needs;
Execution in step S311, the string output current Im (T) that manager 103 will need are sent to little optimizer 102 of each photovoltaic module 101 correspondence, as supervisory instruction;
Execution in step S312, little optimizer 102 receiving managements instruction is controlled its power conversion circuit 205 and is done the DC-to-dc conversion, makes string output current Im (T) reach requirement; Return above-mentioned steps S302 then, the process circulation is carried out.
Fig. 4 is the flow chart of fault detection method of the solar energy photovoltaic system of an embodiment of the utility model.As shown in the figure, the fault detection method of this solar energy photovoltaic system can comprise step:
Execution in step S401; Each little optimizer 102 sends separately input parameter, output parameter to manager 103, and wherein input parameter, output parameter comprise input current, input voltage, input power, output current, output voltage and the power output etc. of each little optimizer 102;
Execution in step S402,103 pairs of output parameters of manager are handled and are performed an analysis;
Execution in step S403, it is no abnormal to judge that output parameter has, if output parameter is no abnormal, then returns above-mentioned steps S402, otherwise gets into step S404;
Execution in step S404,103 pairs of input parameters of manager are handled and are performed an analysis;
Execution in step S405, it is no abnormal to judge that input parameter has, if input parameter is no abnormal, then execution in step S406 assert that little optimizer 102 has fault; Otherwise execution in step S407 assert that the photovoltaic module 101 that is attached thereto has fault;
Execution in step S408 sends fault alarm information.
The solar energy photovoltaic system of the utility model is installed and is comprised and connect little optimizer and photovoltaic module, the output that is connected little optimizer, connection manager and communicating by letter of little optimizer etc.In installation process, the numbering of little optimizer, string numbering and crosstalk are pressed and are left in the manager memory body, are provided with the control analysis of back system and use.Other installation parameters also can leave in the manager memory body like photovoltaic module numbering, photovoltaic module position, direction and inclination angle etc., are provided with the control analysis of back system and use.
Little optimizer can when brand-new photovoltaic system is installed, and also can be installed on the existing photovoltaic system.For existing photovoltaic system, because total output voltage of little optimizer string can determine by manager, so existing inverter still can be used.
The solar energy photovoltaic system of the utility model is gathered the maximum power that each photovoltaic module produces, and can in same photovoltaic system, use the photovoltaic module of different model and rated power even different vendor and material.
The utility model allows photovoltaic module to be installed under the different condition, like illumination, temperature, angle etc., simplifies the design of photovoltaic system.
The output voltage of the little optimizer string of the utility model can freely be provided with according to different system requirements, and the fixedly direct voltage to inverter output can freely be set, and optimizes the performance of inverter.
The performance and the fault of all right each photovoltaic module of detection at any time of the utility model and little optimizer.
Though the utility model with preferred embodiment openly as above, it is not to be used for limiting the utility model, and any those skilled in the art can make possible change and modification in spirit that does not break away from the utility model and scope.Therefore, every content that does not break away from the utility model technical scheme, all falls within the protection range that the utility model claim defined any modification, equivalent variations and modification that above embodiment did according to the technical spirit of the utility model.
Claims (4)
1. a solar energy photovoltaic system is characterized in that, comprising:
A plurality of photovoltaic modulies (101) are gathered solar energy and are produced direct current;
A plurality of little optimizers (102), its input are connected with each photovoltaic module (101) respectively and its output is one another in series is connected, and the output current and/or the output voltage of said each photovoltaic module (101) is optimized, to produce maximum power;
Manager (103) is communicated by letter with said a plurality of little optimizers (102), manages the operating state of each said little optimizer (102); And
Inverter (104) with a string or go here and there said little optimizer (102) more and be connected, converts the direct current after optimizing into the alternating current output of being incorporated into the power networks.
2. solar energy photovoltaic system according to claim 1 is characterized in that, said little optimizer (102) comprising:
Input detecting circuit (201) is connected with the input of said little optimizer (102), detects the electric current and/or the voltage parameter that are input to said little optimizer (102);
Output detection circuit (202) is connected with the output of said little optimizer (102), detects the electric current and/or the voltage parameter of the said little optimizer of output (102);
MPPT maximum power point tracking circuit (203); Be connected with said input detecting circuit (201); According to electric current that is input to said little optimizer (102) and/or voltage parameter said photovoltaic module (101) is done MPPT maximum power point tracking, electric current and/or voltage control requirement that generation needs;
Control circuit (204) is connected with said input detecting circuit (201), output detection circuit (202) and MPPT maximum power point tracking circuit (203) respectively, requires to produce control signal according to said electric current and/or voltage control;
Power conversion circuit (205) is connected with input, output and the said control circuit (204) of said little optimizer (102) respectively, receives said control signal, and the input current from said photovoltaic module (101) is boosted or the step-down conversion; And
Telecommunication circuit (206); Be connected with control circuit (204) with said output detection circuit (202) respectively; Receive the supervisory instruction of said manager (103) and be transmitted to said control circuit (204), perhaps give said manager (103) input current, input voltage, input power, output current, output voltage, power output or little optimizer Temperature Feedback.
3. solar energy photovoltaic system according to claim 1 is characterized in that, goes here and there the shared said manager of said little optimizer (102) (103) more, and perhaps each is gone here and there said little optimizer (102) and uses a said manager (103) respectively.
4. solar energy photovoltaic system according to claim 2 is characterized in that, said manager (103) is communicated by letter with said little optimizer (102) through wireless communication technology or power line communication technology.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203073326U CN202197235U (en) | 2011-08-22 | 2011-08-22 | Solar photovoltaic system |
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| CN2011203073326U CN202197235U (en) | 2011-08-22 | 2011-08-22 | Solar photovoltaic system |
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| CN202197235U true CN202197235U (en) | 2012-04-18 |
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| CN2011203073326U Withdrawn - After Issue CN202197235U (en) | 2011-08-22 | 2011-08-22 | Solar photovoltaic system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102291052A (en) * | 2011-08-22 | 2011-12-21 | 浙江昱能光伏科技集成有限公司 | Solar photovoltaic system as well as energy collecting and optimizing method and fault detecting method thereof |
| CN104283504A (en) * | 2013-07-10 | 2015-01-14 | Ls产电株式会社 | Photovoltaic system |
-
2011
- 2011-08-22 CN CN2011203073326U patent/CN202197235U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102291052A (en) * | 2011-08-22 | 2011-12-21 | 浙江昱能光伏科技集成有限公司 | Solar photovoltaic system as well as energy collecting and optimizing method and fault detecting method thereof |
| WO2013026301A1 (en) * | 2011-08-22 | 2013-02-28 | 浙江昱能光伏科技集成有限公司 | Solar photovoltaic system and energy collection optimizing method and fault detection method thereof |
| CN102291052B (en) * | 2011-08-22 | 2014-01-22 | 浙江昱能光伏科技集成有限公司 | Solar photovoltaic system as well as energy collecting and optimizing method and fault detecting method thereof |
| US9685781B2 (en) | 2011-08-22 | 2017-06-20 | Altenergy Power System, Inc. | Solar photovoltaic system and a method for energy harvest optimization thereof and a method for fault detection thereof |
| CN104283504A (en) * | 2013-07-10 | 2015-01-14 | Ls产电株式会社 | Photovoltaic system |
| CN104283504B (en) * | 2013-07-10 | 2016-11-23 | Ls产电株式会社 | Electro-optical system |
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