CN103823503B - Control method based on the prime pressure-adjustable type solar energy MPPT system of final power back off - Google Patents
Control method based on the prime pressure-adjustable type solar energy MPPT system of final power back off Download PDFInfo
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- CN103823503B CN103823503B CN201410039497.8A CN201410039497A CN103823503B CN 103823503 B CN103823503 B CN 103823503B CN 201410039497 A CN201410039497 A CN 201410039497A CN 103823503 B CN103823503 B CN 103823503B
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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
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
Control method based on the prime pressure-adjustable type solar energy MPPT system of final power back off, including solar battery group, DC-DC module, energy storage device and MCU module, energy storage device is connected with the outfan of DC-DC module, the input of MCU module is connected to for detecting solar battery group and the sensor of DC-DC module output voltage and electric current, a super capacitor group it is connected between solar battery group with DC-DC module, the two ends of super capacitor group are connected with the both positive and negative polarity of solar battery group respectively, sensor for detecting super capacitor group outlet side voltage and electric current is connected with MCU module。Beneficial effect: the impact of output is considered in solar maximum power tracking by the direct voltage output of the DC/DC circuit conversion efficiency factor between solar battery group and charging load and solar battery group, design a kind of prime pressure-adjustable type solar energy MPPT system based on final power back off and control method, improve the energy conversion efficiency of solaode。
Description
Technical field
The present invention relates to solar electrical energy generation track algorithm, be specifically based on the control method of the prime pressure-adjustable type solar energy MPPT system of final power back off。
Background technology
Along with socioeconomic fast development, global energy consumption also increases rapidly year by year, thus causing increasingly severe environmental pollution, has promoted the upsurge of research new forms of energy。In current various new forms of energy, solar energy, because having the advantages such as renewable, pollution-free, Regional Distribution is wide, is subject to the great attention of people, so solar electrical energy generation is as a kind of very effective Land use systems, have also been obtained rapid development。But in the process utilizing solar energy, still suffer from the problems such as cost is high, conversion efficiency is low, utilization is inconvenient。Maximal power tracing (MaximumPowerPointTraeking is called for short MPPT) technology can be effectively improved the conversion efficiency of solar energy, making same group of solaode can export greater power, changing inefficient problem thus improving in solar electrical energy generation。
Solar energy tracing method common at present has many kinds, such as fixed voltage method, disturbance observation method, increment node-pair method, open-circuit voltage method, optimum gradient method, sliding formwork control methods, fuzzy control, electric current Radix Salviae Miltiorrhizae amount control methods etc., most common of which is disturbance observation method and increment node-pair method。More or less all there are some defects in said method, for instance fixed voltage method and open-circuit voltage method are not maximal power tracing algorithms truly when being used alone, and is simply operated on relatively high power point；Disturbance observation method is to oscillate about operation at maximum power point, neither maximum power point, and be likely to occur, when extraneous environmental change, the situation following the tracks of mistake；Electric current and voltage accuracy that the requirement of increment node-pair method measures are higher, it is necessary to the sensor that precision is significantly high, it is achieved more difficult；Other method there is also the problems such as computationally intensive, operating point is unstable。So, it is thus proposed that the combinational algorithm being derived according to above-mentioned algorithm, namely comprehensively employ multiple tracking in the algorithm, to reach better tracking effect。
But above-mentioned algorithm is when following the tracks of maximum power point, it is all that the power directly exported according to solar battery group is as basis for estimation, and really store the energy in energy storage device or the energy that is transferred in electrical network is the energy of output after DC/DC changes, therebetween there is also the problems such as DC/DC circuit conversion efficiency, and this efficiency is change when different input and output voltages and electric current, so the maximum power point that the maximum power point that above-mentioned algorithm obtains not is system finally to be utilized。
It addition, through the test of some existing algorithms is found, finally the charge power of energy-storage system (such as accumulator battery etc.) can be increased along with the increase of the direct voltage output of solar battery group, and existing algorithm not account for this point。
Summary of the invention
The technical problem to be solved is to provide the control method of a kind of prime pressure-adjustable type solar energy MPPT system based on final power back off, the impact of output is considered in solar maximum power tracking by the direct voltage output of the DC/DC circuit conversion efficiency factor between solar battery group and charging load and solar battery group, design a kind of prime pressure-adjustable type solar maximum power tracking based on final power back off, further increase the energy conversion efficiency of solaode, improve the generating capacity of system。
The present invention solves that above-mentioned technical problem be the technical scheme is that the control method of the prime pressure-adjustable type solar energy MPPT system based on final power back off, described system includes the solar battery group utilizing solar electrical energy generation, for adjusting the DC-DC module of solar battery group output voltage, for storing the energy storage device of electric energy and for controlling the MCU module of DC-DC module boosting or blood pressure lowering coefficient, described energy storage device is connected with the outfan of DC-DC module, the input of MCU module is connected to for detecting solar battery group and the sensor of DC-DC module output voltage and electric current, a super capacitor group it is connected between described solar battery group and DC-DC module, the two ends of super capacitor group are connected with the both positive and negative polarity of solar battery group respectively, sensor for detecting super capacitor group outlet side voltage and electric current is connected with MCU module。
Described control method, comprises the following steps:
Step 1: what initialize MCU module arranges parameter, scope [the Va of the solar battery group output voltage that the control program of setting MCU module to be searched for, Vb] and search procedure in voltage variety △ V, the frequency range [fa, fb] of the control signal PWM of the metal-oxide-semiconductor in setting DC-DC module circuit；
Step 2: set initial ranging voltage Vc=Va, peak power output point voltage Vmax, DC-DC maximum output current Imax=0；
Step 3: the voltage according to the super capacitor group currently recorded, adjusting the frequency of pwm signal, thus changing the output electric current of DC-DC module, making super capacitor group be charged or discharge, and its Voltage Cortrol is Vc the most at last；
Step 4: adjust the frequency of pwm signal, find now DC-DC module maximum output current Im, if Im > Imax, then adjusts the setting value of Imax and Vmax, makes Imax=Im, Vmax=Vc；
Step 5: amendment search voltage Vc so that it is increase △ V；
Step 6: if Vc≤Vb, forward step 3 to, otherwise carries out next step；
Step 7: setting Vmax=Vc, the voltage according to the super capacitor group currently recorded, adjusting the frequency of pwm signal, thus changing the output electric current of DC-DC module, making super capacitor group be charged or discharge, its Voltage Cortrol is Vmax the most at last；
Step 8: adjust the frequency of pwm signal, find now DC-DC module maximum output current Im, and set Imax=Im, this state and current maximum power point；
Step 9: starting intervalometer, timing is 5 to 10 minutes, and waiting timer is then；
Step 10: timing arrives, forwards step 2 to, searches for new maximum power point。
The invention has the beneficial effects as follows: the present invention is a kind of maximal power tracing system for the novel solar power generation system in solar power system, and this system has the advantage that
1. between solar battery group and DC-DC module, add level super capacitor group, make solar battery group when finding maximum power point, reduce the late-class circuit impact on the output voltage of solar battery group, it is ensured that the maximum power point that system is found has bigger output；
2. this algorithm is that the charge power according to system load and energy storage device gained finds maximum power point, it is ensured that system is operated on maximum power point truly；
3. in the interlock circuit designed by the present invention, the electronic devices and components of use are few, and the device adopting low-power consumption type more, greatly reduce the power consumption of system, further increase the conversion efficiency of solar power system；
4. the circuit of native system adopts resolution element design, and compared with the design adopting special chip, cost is greatly reduced。
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Labelling in figure: 1, solar battery group, 2, super capacitor group, 3, DC-DC module, 4, energy storage device, 5, MCU module。
Detailed description of the invention
Control method based on the prime pressure-adjustable type solar energy MPPT system of final power back off, described system includes the solar battery group 1 utilizing solar electrical energy generation, for adjusting the DC-DC module 3 of solar battery group output voltage, for storing the energy storage device 4 of electric energy and for controlling the MCU module 5 of DC-DC module boosting or blood pressure lowering coefficient, described energy storage device 4 is connected with the outfan of DC-DC module 3, the input of MCU module 5 is connected to for detecting solar battery group 1 and the sensor of DC-DC module 3 output voltage and electric current, a super capacitor group 2 it is connected between described solar battery group 1 and DC-DC module 3, the two ends of super capacitor group 2 are connected with the both positive and negative polarity of solar battery group 1 respectively, sensor for detecting super capacitor group 2 outlet side voltage and electric current is connected with MCU module 5。
Based on the control method of the prime pressure-adjustable type solar energy MPPT system of final power back off, comprise the following steps:
Step 1: what initialize MCU module 5 arranges parameter, scope [the Va of solar battery group 1 output voltage that the control program of setting MCU module 5 to be searched for, Vb] and search procedure in voltage variety △ V, the frequency range [fa, fb] of the control signal PWM of the metal-oxide-semiconductor in setting DC-DC module 3 circuit；
Step 2: set initial ranging voltage Vc=Va, peak power output point voltage Vmax, DC-DC maximum output current Imax=0；
Step 3: the voltage according to the super capacitor group 2 currently recorded, adjusting the frequency of pwm signal, thus changing the output electric current of DC-DC module 3, making super capacitor group 2 be charged or discharge, and its Voltage Cortrol is Vc the most at last；
Step 4: adjust the frequency of pwm signal, find now DC-DC module 3 maximum output current Im, if Im > Imax, then adjusts the setting value of Imax and Vmax, makes Imax=Im, Vmax=Vc；
Step 5: amendment search voltage Vc so that it is increase △ V；
Step 6: if Vc≤Vb, forward step 3 to, otherwise carries out next step；
Step 7: setting Vmax=Vc, the voltage according to the super capacitor group 2 currently recorded, adjusting the frequency of pwm signal, thus changing the output electric current of DC-DC module 3, making super capacitor group 2 be charged or discharge, its Voltage Cortrol is Vmax the most at last；
Step 8: adjust the frequency of pwm signal, find now DC-DC module 3 maximum output current Im, and set Imax=Im, this state and current maximum power point；
Step 9: starting intervalometer, timing is 5 to 10 minutes, and waiting timer is then；
Step 10: timing arrives, forwards step 2 to, searches for new maximum power point。
Claims (1)
1. based on the control method of the prime pressure-adjustable type solar energy MPPT system of final power back off, described system includes the solar battery group (1) utilizing solar electrical energy generation, for adjusting the DC-DC module (3) of solar battery group output voltage, for storing the energy storage device (4) of electric energy and for controlling the MCU module (5) of DC-DC module boosting or blood pressure lowering coefficient, described energy storage device (4) is connected with the outfan of DC-DC module (3), the input of MCU module (5) is connected to for detecting solar battery group (1) and the sensor of DC-DC module (3) output voltage and electric current, a super capacitor group (2) it is connected between described solar battery group (1) and DC-DC module (3), the two ends of super capacitor group (2) are connected with the both positive and negative polarity of solar battery group (1) respectively, sensor for detecting super capacitor group (2) outlet side voltage and electric current is connected with MCU module (5)；It is characterized in that: described control method, comprise the following steps:
Step 1: what initialize MCU module (5) arranges parameter, scope [the Va of solar battery group (1) output voltage that the control program of setting MCU module (5) to be searched for, Vb] and search procedure in voltage variety △ V, the frequency range [fa, fb] of the control signal PWM of the metal-oxide-semiconductor in setting DC-DC module (3) circuit；
Step 2: set initial ranging voltage Vc=Va, peak power output point voltage Vmax, DC-DC maximum output current Imax=0；
Step 3: the voltage according to the super capacitor group (2) currently recorded, adjusting the frequency of pwm signal, thus changing the output electric current of DC-DC module (3), making super capacitor group (2) be charged or discharge, and its Voltage Cortrol is Vc the most at last；
Step 4: adjust the frequency of pwm signal, find now DC-DC module (3) maximum output current Im, if Im > Imax, then adjusts the setting value of Imax and Vmax, makes Imax=Im, Vmax=Vc；
Step 5: amendment search voltage Vc so that it is increase △ V；
Step 6: if Vc≤Vb, forward step 3 to, otherwise carries out next step；
Step 7: set Vmax=Vc, voltage according to the super capacitor group (2) currently recorded, adjusts the frequency of pwm signal, thus changing the output electric current of DC-DC module (3), making super capacitor group (2) be charged or discharge, its Voltage Cortrol is Vmax the most at last；
Step 8: adjust the frequency of pwm signal, find now DC-DC module (3) maximum output current Im, and set Imax=Im, this state and current maximum power point；
Step 9: starting intervalometer, timing is 5 to 10 minutes, and waiting timer is then；
Step 10: timing arrives, forwards step 2 to, searches for new maximum power point。
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| CN102778915A (en) * | 2011-12-26 | 2012-11-14 | 洛阳理工学院 | Self-adaptive MPPT (Maximum Power Point Tracking) method for solar energy with three stages of sectional temperature fed back based on final power |
| CN203733025U (en) * | 2014-01-27 | 2014-07-23 | 洛阳理工学院 | Preceding-stage voltage regulation type solar MPPT system based on final power feedback |
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| JP3945658B1 (en) * | 2006-02-20 | 2007-07-18 | 株式会社パワーシステム | Charging device for capacitor storage power supply |
| TW200827974A (en) * | 2006-12-18 | 2008-07-01 | Ming-Hsin Sun | Power tracking system of solar energy system and the method thereof |
| CN102904272B (en) * | 2011-07-29 | 2015-07-29 | 通用电气公司 | There is energy conversion system and the method for the transient affair ride-through capability of improvement |
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| CN102778915A (en) * | 2011-12-26 | 2012-11-14 | 洛阳理工学院 | Self-adaptive MPPT (Maximum Power Point Tracking) method for solar energy with three stages of sectional temperature fed back based on final power |
| CN203733025U (en) * | 2014-01-27 | 2014-07-23 | 洛阳理工学院 | Preceding-stage voltage regulation type solar MPPT system based on final power feedback |
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