CN204349902U - A kind of novel MPPT hardware configuration - Google Patents
A kind of novel MPPT hardware configuration Download PDFInfo
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- CN204349902U CN204349902U CN201420561127.6U CN201420561127U CN204349902U CN 204349902 U CN204349902 U CN 204349902U CN 201420561127 U CN201420561127 U CN 201420561127U CN 204349902 U CN204349902 U CN 204349902U
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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
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Abstract
The utility model discloses a kind of novel MPPT hardware configuration, step is: the current solar panel open circuit voltage of sampled measurements and battery tension; When solar cell open circuit voltage is greater than battery tension, open and follow the trail of, main control unit exports PSMC1A, PSMC1B and PSMC2A; PSMC1A is through exporting PWM1, PSMC1B and PSMC2A through exporting PWM2 with logical circuit with logical circuit; PWM1 and PWM2 exports PWMH and PWML respectively through drive circuit unit; PWMH and PWML drives the P-V curve of synchronous rectification unit scan solar panel, by comparing current sampling unit real-time sampling output current, obtains solar panel maximum power point.The utility model can find accurately, rapidly the maximum power point of solar panel, and does not limit by environmental factors such as illumination, temperature, shade block, and tracking speed is fast, efficiency is high.
Description
Technical field
The utility model relates to the maximum power point tracking technical field of solar panel, specifically a kind of novel MPPT hardware configuration.
Background technology
Output characteristic due to solar panel is nonlinear, and the main impact by the external environment such as intensity of illumination and temperature, maximum power point often can change.MPPT controller object is to improve system effectiveness, makes every effort to carry out real-time regulating system parameter according to different conditions, and the solar panel moment is operated near maximum service rating point.
The MPPT algorithm of current comparative maturity mainly contains disturbance observation, increment conductance method, constant voltage process etc., and these technology generally all regulate using voltage as with reference to value.Wherein most widely used method is disturbance observation, because its algorithm is simple, easy realization, not high and application is extremely extensive to technical requirement, but also have obvious shortcoming, the output voltage that ratio juris is disturbance cell panel is observed in disturbance, and according to the principle making power output increase, system is controlled, when stable state, system can near maximum power point oscillatory operation and cause power loss, and when intensity of illumination or temperature Rapid Variable Design easily there is erroneous judgement in system.In addition, when solar panel portion has shade to block, the P-V curve of cell panel has multiple power waves peak dot, this situation adopt traditional tracing algorithm to determine which crest is maximum power point.
Summary of the invention
The purpose of this utility model is to provide a kind of novel MPPT hardware configuration, avoids the weak point of above-mentioned technology.
For achieving the above object, the utility model provides following technical scheme:
A novel MPPT hardware configuration, comprises solar panel, input filter unit, main control unit, Logical processing unit, drive circuit unit, synchronous rectification unit, output filtering unit, current sampling unit and storage battery.
As further program of the utility model: described input filter unit comprises electric capacity C1, described synchronous rectification unit comprises field effect transistor Q1, field effect transistor Q2 and Schottky diode D1, described output filtering unit comprises inductance L 1 and electric capacity C2, described current sampling unit comprises resistance R1, the minus earth of described solar panel, the positive pole of described solar panel is connected with the positive pole of electric capacity C1, the minus earth of described electric capacity C1, the positive pole of described solar panel is also connected with 2 pin of field effect transistor Q1, 3 pin of described field effect transistor Q1 are connected with 2 pin of field effect transistor Q2, the 3 pin ground connection of described field effect transistor Q2, 2 pin of described field effect transistor Q2 are connected with the Schottky diode D1 of ground connection, 2 pin of described field effect transistor Q2 are by inductance L 1, resistance R1 is connected with the positive pole of storage battery, the other end of described inductance L 1 is by electric capacity C2 ground connection, the minus earth of described storage battery, described main control unit exports PSMC1A, PSMC1B and PSMC2A, described PSMC1A is processed into PWM1 through Logical processing unit, described PSMC1B and PSMC2A is processed into PWM2 through Logical processing unit, described PWM1 exports PWMH through drive circuit unit, described PWM2 exports PWML through drive circuit unit, described PWMH is connected with 1 pin of field effect transistor Q1, and described PWML is connected with 1 pin of field effect transistor Q2.
Compared with prior art, the beneficial effects of the utility model are: the maximum power point that can find solar panel accurately, rapidly, and not by the restriction of the environmental factors such as illumination, temperature, shade block, tracking speed is fast, efficiency is high.
Accompanying drawing explanation
Fig. 1 is novel MPPT hardware block diagram;
Fig. 2 is the P-V curve of cell panel under normal circumstances;
Fig. 3 is the cell panel P-V curve having shade to block;
Waveform when Fig. 4 is duty ratio Dmin when starting to follow the trail of;
Fig. 5 is duty ratio D in tracing process
50%time waveform;
Waveform when Fig. 6 is duty ratio Dmax in tracing process;
Fig. 7 has followed the trail of the waveform that rear asynchronous mode is converted to synchronous mode;
Fig. 8 has followed the trail of the waveform that rear asynchronous mode is converted to synchronous mode.
Embodiment
Below in conjunction with the utility model embodiment and accompanying drawing, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a novel MPPT hardware configuration, comprises solar panel, input filter unit, main control unit, Logical processing unit, drive circuit unit, synchronous rectification unit, output filtering unit, current sampling unit and storage battery.Described input filter unit comprises electric capacity C1, described synchronous rectification unit comprises field effect transistor Q1, field effect transistor Q2 and Schottky diode D1, described output filtering unit comprises inductance L 1 and electric capacity C2, described current sampling unit comprises resistance R1, the minus earth of described solar panel, the positive pole of described solar panel is connected with the positive pole of electric capacity C1, the minus earth of described electric capacity C1, the positive pole of described solar panel is also connected with 2 pin of field effect transistor Q1, 3 pin of described field effect transistor Q1 are connected with 2 pin of field effect transistor Q2, the 3 pin ground connection of described field effect transistor Q2, 2 pin of described field effect transistor Q2 are connected with the Schottky diode D1 of ground connection, 2 pin of described field effect transistor Q2 are by inductance L 1, resistance R1 is connected with the positive pole of storage battery, the other end of described inductance L 1 is by electric capacity C2 ground connection, the minus earth of described storage battery, described main control unit exports PSMC1A, PSMC1B and PSMC2A, described PSMC1A is processed into PWM1 through Logical processing unit, described PSMC1B and PSMC2A is processed into through Logical processing unit, described PWM1 exports PWMH through drive circuit unit, described PWM2 exports PWML through drive circuit unit, described PWMH is connected with 1 pin of field effect transistor Q1, and described PWML is connected with 1 pin of field effect transistor Q2.Wherein, main control unit is for generation of control signal, the signal that Logical processing unit is used for main control unit produces carries out logical process, drive circuit unit is for driving synchronous rectification unit, synchronous rectification unit is used for scanning and asynchronous and synchronous conversion, current sampling unit is used for carrying out real-time sampling output current, and input filter unit and output filtering unit are used for storage power, carry out filtering.
The step of novel MPPT algorithm is as follows: first sampled measurements obtains current solar panel open circuit voltage Vpv and battery tension Vbat, then the size of two magnitudes of voltage is compared, if the open circuit voltage Vpv of current solar panel is less than battery tension Vbat, main control unit does not now export control signal, if the open circuit voltage Vpv of current solar panel is greater than battery tension Vbat, then open tracking, main control unit exports PWM:PSMC1A and PSMC1B that a pair frequency is 40KHZ complementation, also exporting a road frequency is the PWM:PSMC2A of 4KHZ, PSMC1A is through exporting and the PWM1 of PSMC1A same-phase with amplitude same frequency with logical circuit, PSMC1B and PSMC2A is through exporting and the PWM2 of PSMC2A same-phase with amplitude same frequency with logical circuit, PWM1 and PWM2 exports drive waveforms PWMH and the PWML of field effect transistor Q1 and field effect transistor Q2 in synchronous rectification unit respectively through drive circuit unit, now, the duty ratio DH of the drive waveforms PWMH of synchronous rectification unit field effect transistor Q1 increases to the maximum duty cycle Dmax of setting with certain step-length from the minimum duty cycle Dmin set, frequency is 40KHZ, the duty ratio DL of the drive waveforms PWML of field effect transistor Q2 minimally, frequency is 4KHZ, PWMH and PWML portion waveshape in the process as Figure 4-Figure 6.
Whole scanning process synchronous rectification cell operation is at asynchronous mode, and namely the switching frequency of field effect transistor Q1 is 40KHZ, and duty ratio changes, and the switching frequency of field effect transistor Q2 is 4KHZ, and duty ratio immobilizes.The duty ratio of the drive waveforms PWMH of field effect transistor Q1 scans the process of whole solar panel P-V curve (as shown in Fig. 2-Fig. 3) exactly from the process that Dmin increases to Dmax.In whole scanning process, current sampling unit is sampled output current constantly, and obtain maximum current Imax by comparing, the duty ratio that Imax is corresponding is exactly the duty ratio DMPP of solar panel maximum power point.
After scanning solar panel maximum power point, if the current value I1 that current flow sampling unit samples is greater than the asynchronous mode preset be transformed into synchronous mode mark current value Ix, then needing synchronous rectification cell translation is synchronous mode, namely the drive waveforms frequency of field effect transistor Q1 and field effect transistor Q2 is all 40KHZ, phase place is contrary, transfer process is: main control unit increases the duty ratio of PSMC2A until PSMC2A duty ratio is for 100% with certain step value, PSMC2A and PSMC1B exports PWM2 by logic unit circuit in this process, PWM2 is that waveform quantity successively increases the synchronous PWM with PSMC1B within the 4KHZ cycle, until export PWML through drive circuit unit, with PWMH Complete Synchronization, in this process, the waveform of PWMH and PWML as shown in Figure 7.Once the current value I1 that current flow sampling unit samples is less than the synchronous mode preset be transformed into asynchronous mode mark current value Iy, then needing again synchronous rectification cell translation is asynchronous mode, transfer process is: main control unit becomes 4KHZ the frequency of PSMC2A, phase place is fixed as the minimum value of setting, and in this process, the waveform of PWMH and PWML as shown in Figure 8.
The utility model can find the maximum power point of solar panel accurately, rapidly, and not by the restriction of the environmental factors such as illumination, temperature, shade block, tracking speed is fast, efficiency is high.
To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.
In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
Claims (1)
1. a novel MPPT hardware configuration, it is characterized in that, comprise solar panel, input filter unit, main control unit, Logical processing unit, drive circuit unit, synchronous rectification unit, output filtering unit, current sampling unit and storage battery, described input filter unit comprises electric capacity C1, described synchronous rectification unit comprises field effect transistor Q1, field effect transistor Q2 and Schottky diode D1, described output filtering unit comprises inductance L 1 and electric capacity C2, described current sampling unit comprises resistance R1, the minus earth of described solar panel, the positive pole of described solar panel is connected with the positive pole of electric capacity C1, the minus earth of described electric capacity C1, the positive pole of described solar panel is also connected with 2 pin of field effect transistor Q1, 3 pin of described field effect transistor Q1 are connected with 2 pin of field effect transistor Q2, the 3 pin ground connection of described field effect transistor Q2, 2 pin of described field effect transistor Q2 are connected with the Schottky diode D1 of ground connection, 2 pin of described field effect transistor Q2 are by inductance L 1, resistance R1 is connected with the positive pole of storage battery, the other end of described inductance L 1 is by electric capacity C2 ground connection, the minus earth of described storage battery, described main control unit exports PSMC1A, PSMC1B and PSMC2A, described PSMC1A is processed into PWM1 through Logical processing unit, described PSMC1B and PSMC2A is processed into PWM2 through Logical processing unit, described PWM1 exports PWMH through drive circuit unit, described PWM2 exports PWML through drive circuit unit, described PWMH is connected with 1 pin of field effect transistor Q1, and described PWML is connected with 1 pin of field effect transistor Q2.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104378059A (en) * | 2014-09-28 | 2015-02-25 | 深圳硕日新能源科技有限公司 | Novel MPPT algorithm and method for obtaining hardware for novel MPPT algorithm |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104378059A (en) * | 2014-09-28 | 2015-02-25 | 深圳硕日新能源科技有限公司 | Novel MPPT algorithm and method for obtaining hardware for novel MPPT algorithm |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150520 Termination date: 20160928 |