CN103529898B - A kind of control method being applied to the MPPT maximum power point tracking of photovoltaic charging system - Google Patents
A kind of control method being applied to the MPPT maximum power point tracking of photovoltaic charging system Download PDFInfo
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- CN103529898B CN103529898B CN201310308402.3A CN201310308402A CN103529898B CN 103529898 B CN103529898 B CN 103529898B CN 201310308402 A CN201310308402 A CN 201310308402A CN 103529898 B CN103529898 B CN 103529898B
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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
A kind of control method being applied to the MPPT maximum power point tracking of photovoltaic charging system.Belong to technical field of electric control.Circuit hardware only gathers the current signal exported; Utilize the calculation processing power of single-chip microcomputer, implement to control and regulate to the pulsewidth of DC converter, charge a battery through DC converter with the electric energy that solar components sends, and according to the change of intensity of sunshine, regulate the pulsewidth of DC converter in real time, output power is run close to the maximum power point of solar module.Technique effect of the present invention: determine after equipment runs, hardware only gathers the current signal exported, and the error that software solar maximum power point is followed the tracks of is less than 1%, and hardware efficiency is greater than 93%.
Description
Technical field
The present invention is a kind of control method being applied to the MPPT maximum power point tracking of photovoltaic charging system.Belong to technical field of electric control.
Background technology
MPPT maximum power point tracking is the important gordian technique of in solar electrical energy generation, and it refers to, for making full use of sun power, the output voltage of control break solar battery array or the method for electric current, make array always work on maximum power point.
Solar maximum power point track algorithm conventional at present has constant voltage-tracing method, hill climbing method, stagnant ring relative method, quadratic interpolattion etc., but carry out MPPT maximum power point tracking computing after the voltage and current value that these algorithms are substantially all collection battery components to be exported, the speed that these algorithms all exist tracking is slower, collection signal many (electric current and voltage), when applying in photovoltaic charging system, the phenomenon showed is exactly that high (collection signal is many for system failure rate, add complicacy and the failure rate of hardware), when illumination generation acute variation, system responses is slow, software easily occurs to crash.
Summary of the invention
The object of the invention, for above-mentioned deficiency, hardware only gathers the current signal exported, simplifies hardware circuit, decrease failure rate.Design a new control method, utilize the calculation processing power of single-chip microcomputer, implement to control and regulate to the pulsewidth of DC converter, charge a battery through DC converter with the electric energy that solar components sends, and according to the change of intensity of sunshine, regulate the pulsewidth of DC converter in real time, make output power close to the peak power of solar module.
Be applied to a control method for the MPPT maximum power point tracking of photovoltaic charging system, containing following steps:
Step 1: each variable of initialization; PWM dutycycle variable P=0; Dutycycle correction variables D=1; The constant offset M=5 that dutycycle is fixing;
Step 2: export with current PWM dutyfactor value P, and save as P_A; Gather primary current, and save as I_A;
Step 3:PWM dutyfactor value P deducts a constant M on P_A basis; Export PWM dutyfactor value P_B now, gather primary current, save as I_B;
Step 4:PWM dutyfactor value P adds a constant M on P_A basis; Export PWM dutyfactor value P_C now, gather primary current, save as I_C;
The P_A that step 5:PWM dutyfactor value P preserves before changeing back;
Step 6: judge that whether I_B and I_C be all little than I_A; If so, forward step 9 to, if not, perform step 7;
Step 7: if judge that I_B is greater than I_C, then judge that current modified value D's is positive and negative, if be negative, modified value D reduces 1, if be that just modified value D is set to-1; If I_B is less than I_C, then judge the positive and negative of current modified value, if be just, modified value D increases by 1, if be set to 1 for bearing modified value D;
Step 8:PWM dutyfactor value P superposes with modified value D value, produces a new P value; I.e. P=P+D;
Step 9: export new PWM dutyfactor value P; Jump to step 2; Circulate according to this, progressively accelerate to approach maximum power point; Suddenly stop after arriving; Dynamically maintain the voltage closing on maximum power point.
Technique effect of the present invention:
Determine after equipment runs, hardware only gathers the current signal exported, the error that software solar maximum power point is followed the tracks of is less than 1%, and hardware efficiency is greater than 93%.
Accompanying drawing explanation
When considered in conjunction with the accompanying drawings, by referring to detailed description below, more completely can understand the present invention better and easily learn wherein many adjoint advantages, but accompanying drawing described herein is used to provide a further understanding of the present invention, form a part of the present invention, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention, wherein:
Fig. 1 is hardware block diagram of the present invention.
Fig. 2 is program flow diagram of the present invention.
Embodiment
Obviously, the many modifications and variations that those skilled in the art do based on aim of the present invention belong to protection scope of the present invention.
Embodiment 1: as shown in the hardware block diagram of Fig. 1, single-chip microcomputer connects current collecting device and solar module, and pulsewidth output instruction signal is connected DC-DC DC converter by single-chip microcomputer, and DC-DC DC converter connects solar module and accumulator.
Solar module is powered to DC-DC DC converter and single-chip microcomputer, current collecting device gathers output current signal and sends into single-chip microcomputer, single-chip microcomputer is according to the change of output current, after calculation process after output pulse width output order control signal to DC-DC DC converter, DC-DC DC converter controls output current value, completes the control that solar maximum power point is followed the tracks of.
Embodiment 2: as shown in the program flow diagram of Fig. 2, a kind of control method being applied to the MPPT maximum power point tracking of photovoltaic charging system, containing following steps;
Step 1: each variable of initialization; PWM dutycycle variable P=0; Dutycycle correction variables D=1; The constant offset M=5 that dutycycle is fixing;
Step 2: export with current PWM dutyfactor value P, and save as P_A; Gather primary current, and save as IA;
Step 3:PWM dutyfactor value P deducts a constant M on P_A basis; Export PWM dutyfactor value P_B now, gather primary current, save as I_B;
Step 4:PWM dutyfactor value P adds a constant M on P_A basis; Export PWM dutyfactor value P_C now, gather primary current, save as I_C;
The P_A that step 5:PWM dutyfactor value P preserves before changeing back;
Step 6: judge that whether I_B and I_C be all little than I_A; If so, forward step 9 to, if not, perform step 7;
Step 7: if judge that I_B is greater than I_C, then judge that current modified value D's is positive and negative, if be negative, modified value D reduces 1, if be that just modified value D is set to-1; If I_B is less than I_C, then judge the positive and negative of current modified value, if be just, modified value D increases by 1, if be set to 1 for bearing modified value D;
Step 8:PWM dutyfactor value P superposes with modified value D value, produces a new P value; I.e. P=P+D;
Step 9: export new PWM dutyfactor value P; Jump to step 2; Circulate according to this, progressively accelerate to approach maximum power point; Suddenly stop after arriving; Dynamically maintain the voltage closing on maximum power point.
Embodiment 3: as shown in the program flow diagram of Fig. 2, a kind of control method being applied to the MPPT maximum power point tracking of photovoltaic charging system, containing following steps;
Step 1; Initialization; Arrange:
P=0 PWM Duty ratio control variable;
D=1 PWM dutycycle correction variable;
M=5 PWM dutycycle constant offset constant;
Step 2; Preservation current P value is P_A, gathers primary current, saves as I_A;
Step 3; Assignment P=P_A-M, gathers primary current, saves as I_B;
Step 4; Assignment P=P_A+M, gathers primary current, saves as I_C;
Step 5; Recover P value, i.e. P=P_A;
Step 6; If I_A >=I_B and I_A >=I_C; If so, step 15 is turned to; Otherwise turn to step 7;
Step 7; If I_B > is I_C, if so, turn to step 8; Otherwise turn to step 11;
Step 8; If D < 0, if so, turn to step 9; Otherwise turn to step 10;
Step 9; Assignment D=D-1;
Step 10; Assignment D=-1;
Step 11; If D > 0, if so, turn to step 12; Otherwise turn to step 13;
Step 12; Assignment D=D+1;
Step 13; Assignment D=1;
Step 14; PWM initial value superposes with modified value, i.e. P=P+D;
Step 15; Export new P value; Jump to step 2; Circulate according to this.
As mentioned above, embodiments of the invention are explained, but as long as do not depart from inventive point of the present invention in fact and effect can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, such variation is also all included within protection scope of the present invention.
Claims (1)
1. be applied to a control method for the MPPT maximum power point tracking of photovoltaic charging system, it is characterized in that: circuit hardware only gathers the current signal exported; Utilize the calculation processing power of single-chip microcomputer, implement to control and regulate to the pulsewidth of DC converter, charge a battery through DC converter with the electric energy that solar module sends, and according to the change of intensity of sunshine, regulate the pulsewidth of DC converter in real time, output power is run close to the maximum power point of solar module; Concrete containing following steps:
Step 1: each variable of initialization; PWM dutycycle variable P=0; Dutycycle correction variables D=1; The constant offset M=5 that dutycycle is fixing;
Step 2: export with current PWM dutyfactor value P, and save as P_A; Gather primary current, and save as I_A;
Step 3:PWM dutyfactor value P deducts a constant M on P_A basis; Export PWM dutyfactor value P_B now, gather primary current, save as I_B;
Step 4:PWM dutyfactor value P adds a constant M on P_A basis; Export PWM dutyfactor value P_C now, gather primary current, save as I_C;
The P_A that step 5:PWM dutyfactor value P preserves before changeing back;
Step 6: judge that whether I_B and I_C be all little than I_A; If so, forward step 9 to, if not, perform step 7;
Step 7: if judge that I_B is greater than I_C, then judge that current modified value D's is positive and negative, if be negative, modified value D reduces 1, if be that just modified value D is set to-1; If I_B is less than I_C, then judge the positive and negative of current modified value, if be just, modified value D increases by 1, if be set to 1 for bearing modified value D;
Step 8:PWM dutyfactor value P superposes with modified value D value, produces a new P value; I.e. P=P+D;
Step 9: export new PWM dutyfactor value P; Jump to step 2; Circulate according to this, progressively accelerate to approach maximum power point; Suddenly stop after arriving; Dynamically maintain the voltage closing on maximum power point.
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| CN105226335A (en) * | 2014-06-25 | 2016-01-06 | 陈小莉 | A kind of low cost small-power MPPT charging method |
| CN110444827B (en) * | 2019-07-22 | 2021-07-02 | 深圳源码智能照明有限公司 | MPPT-based charging control method and solar photovoltaic system |
Citations (4)
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| CN101063891A (en) * | 2006-04-28 | 2007-10-31 | 上海森昌电气科技有限公司 | Device for tracking maximal power point of Solar cell and tracking method thereof |
| CN202094649U (en) * | 2011-05-13 | 2011-12-28 | 淄博职业学院 | Charging circuit of solar energy cell |
| CN202167865U (en) * | 2011-03-31 | 2012-03-14 | 北京恒德阳光光电科技有限公司 | Charging controller with photovoltaic maximum power output |
| CN202495780U (en) * | 2012-02-06 | 2012-10-17 | 苏州大学 | Wide input voltage intelligent photovoltaic charging control system with MPPT function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101311528B1 (en) * | 2009-12-11 | 2013-09-25 | 한국전자통신연구원 | Device and Method for Tracing Maximum Power of Solar Cell |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101063891A (en) * | 2006-04-28 | 2007-10-31 | 上海森昌电气科技有限公司 | Device for tracking maximal power point of Solar cell and tracking method thereof |
| CN202167865U (en) * | 2011-03-31 | 2012-03-14 | 北京恒德阳光光电科技有限公司 | Charging controller with photovoltaic maximum power output |
| CN202094649U (en) * | 2011-05-13 | 2011-12-28 | 淄博职业学院 | Charging circuit of solar energy cell |
| CN202495780U (en) * | 2012-02-06 | 2012-10-17 | 苏州大学 | Wide input voltage intelligent photovoltaic charging control system with MPPT function |
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