CN103294102A - Solar CVT control method based on temperature detection - Google Patents
Solar CVT control method based on temperature detection Download PDFInfo
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- CN103294102A CN103294102A CN2012104337706A CN201210433770A CN103294102A CN 103294102 A CN103294102 A CN 103294102A CN 2012104337706 A CN2012104337706 A CN 2012104337706A CN 201210433770 A CN201210433770 A CN 201210433770A CN 103294102 A CN103294102 A CN 103294102A
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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
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- 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
The invention discloses a solar CVT (Constant-Voltage Transformer) control method based on temperature detection, which comprises a photovoltaic cell array, a DC/DC (Direct Current/Direct Current) converter, a photovoltaic voltage detection circuit, a PI (Proportional-Integral) adjuster, a PWM (Pulse-Width Modulation) controller, an isolation driving circuit, a temperature sensor and an arithmetic circuit are provided, wherein the photovoltaic cell array is connected with the DC/DC converter; the temperature sensor, the arithmetic circuit, the PI adjuster, the PWM controller and the isolation driving circuit are connected between the photovoltaic cell array and the DC/DC converter sequentially; and the photovoltaic voltage detection circuit is connected in parallel between the photovoltaic cell array and the DC/DC converter, and connected with the PI adjuster. A temperature of a photovoltaic cell is detected by the temperature sensor; a set voltage value of a maximum power point is adjusted in real time according to the detected temperature and the voltage-temperature characteristic of the measured maximum power point of the photovoltaic cell; and the method is simple in structure, low in cost and high in practicability.
Description
Technical field
The present invention relates to the solar-energy photo-voltaic cell field, particularly a kind of sun power CVT control method based on temperature detection.
Background technology
Sun power has boundless development prospect as a kind of pollution-free, reproducible new forms of energy, has obtained widespread use at home and abroad.Solar energy power generating is the generation mode that utilizes the photovoltaic effect of solar cell that sun power directly is converted to electric energy and rationally utilizes in addition, the photovoltaic effect of photovoltaic cell as shown in Figure 1, two interpolars of photovoltaic cell have electromotive force to produce, connect load (as bulb), in the loop, just there is electric current to flow through, but, in actual applications, particularly in the bigger application scenario of power, photovoltaic cell directly connects load and infeasible, because generally speaking, load and battery (power supply) do not match, photovoltaic cell can't the electricity generation efficiency that it is maximum be brought into play, therefore, to add the one-level circuit usually between photovoltaic cell and the load, when realizing the DC/DC conversion, realize maximal power tracing (MPPT), the MPPT control method has multiple, follows the tracks of (CVT) method as constant voltage, disturbance observation (P﹠amp; 0), increment conductance method, fuzzy logic control method, genetic algorithm etc.
Having applied for a patent of akin implementation before this:
1) application number is " 200810052443X ", name is called " based on the sun power maximal efficiency tracking circuit of CVT method ", what this patent of invention adopted is the CVT control method, it is at first to suppose under the temperature-resistant situation, the substantially invariable principle of the maximum power point voltage of photovoltaic cell during according to change in radiation intensity, thereby force the output voltage of photovoltaic cell to remain at output certain power on the in advance given voltage by control circuit, this control method has advantages such as implementation is simple, reliable and stable;
This method is a kind of method under the constant prerequisite of supposition photovoltaic battery temperature, in fact, photovoltaic cell in the course of the work, from morning to night, range of temperature throughout the year is very big, therefore this method is subjected to such environmental effects such as temperature very big, there is very big shortcoming in this method in engineering is used in other words, and its generating efficiency is lower than additive methods such as disturbance observations.
2) application number is " 2008100339994 ", name is called " the time variant voltage photovoltaic system maximum power tracking and controlling method that adapts to weather conditions ", this method is by the temperature three item number certificates of voltage, electric current and the photovoltaic battery panel of the output of collection photovoltaic cell, carrying out predetermined algorithm calculates, thereby determine the best effort point voltage, go forward side by side trip temperature and illuminance compensation.This method considers that temperature is to the influence of photovoltaic output power, but, because the characteristic of photovoltaic cell complexity, only calculate its open-circuit voltage and brightness value according to the temperature of certain voltage, electric current and photovoltaic battery panel constantly, and further to obtain optimum operating voltage thus be extremely coarse, therefore has very big defective.
3) application number is " 2007100989112 ", name is called " a kind of method of tracing maximum power point of solar photovoltaic battery ", this method is improved traditional CVT, namely at first detect illumination intensity value, and provide photovoltaic cell by tabling look-up according to illumination intensity value and give fixed working voltage, and follow the tracks of it by control circuit.This method is considered the influence of CVT such as environmental factor control methods such as intensity of illumination, than traditional CVT, its generating efficiency makes moderate progress, but intensity of illumination and temperature are not simple single-valued function relation, so the method can not effectively overcome environment temperature to the influence of photovoltaic generation.In addition, this method need adopt control chip to store the given voltage of solar-energy photo-voltaic cell under the different intensity of sunshines, and is comparatively complicated.
4) application number is " 2003101205481 ", name is called " maximum power tracing method of solar power system and device ", what this invention was adopted is the disturbance observation, needing to adopt single-chip microcomputer, DSP etc. is controller, need programming, implement comparatively complexity, and can only near maximum power point, shake operation, can cause the part power loss, the given of initial value and tracing step has considerable influence to tracking accuracy and speed.
5) application number is " 2006100261702 ", name is called " method of solar cell maximum power point tracking device and tracking thereof ", what this invention was adopted is the disturbance observation, shortcoming is identical with the 4th, and needing to adopt single-chip microcomputer, DSP etc. is controller, needs programming, implement comparatively complicated, and can only shake operation near maximum power point, can cause the part power loss, the given of initial value and tracing step has considerable influence to tracking accuracy and speed.
6) application number is " 200510103749X ", and name is called " method of solar cell maximum power point tracking device and tracking thereof ", and what this invention was adopted is genetic algorithm, precision is higher, and efficient is higher, but circuit need adopt digital microprocessor, control algolithm is complicated, and cost is higher.
At present at above-mentioned shortcoming, how to carry out technological improvement on traditional CVT control method basis, in order to can well realize tracing maximum power of photovoltaic cell, can make again simultaneously that circuit structure is simple, design convenience, stable and reliable operation, with low cost, practical be technical matters solved by the invention.
Summary of the invention
Fundamental purpose of the present invention is to overcome the deficiencies in the prior art, provide a kind of employing temperature sensor to detect photovoltaic battery temperature, and adjust the maximum power point voltage set-point according to institute's detected temperatures in real time according to the actual maximum power of photovoltaic cell point voltage-temperature characterisitic that records, simple in structure, stable and reliable operation, with low cost, the practical sun power CVT control method based on temperature detection.
For achieving the above object, the present invention has adopted following technical scheme: a kind of sun power CVT control method based on temperature detection, comprise photovoltaic battery array, the DC/DC transducer, the photovoltaic voltage detecting circuit, pi regulator, the PWM controller, isolated drive circuit, temperature sensor, computing circuit, described photovoltaic battery array is connected with the DC/DC transducer, also be connected with temperature sensor in turn between described photovoltaic battery array and the DC/DC transducer, computing circuit, pi regulator, the PWM controller, isolated drive circuit, by detecting photovoltaic battery temperature, calculate maximum power point voltage in real time by computing circuit and as the voltage given value according to linear characteristic between the actual maximum power of photovoltaic cell point voltage Um-temperature that records, thereby guarantee to change when causing photovoltaic battery temperature to change photovoltaic cell all the time with its corresponding peak power output electric energy in environmental factor;
Described photovoltaic voltage detecting circuit is parallel between photovoltaic battery array and the DC/DC transducer, described photovoltaic voltage detecting circuit is connected with pi regulator, by detecting the output voltage of photovoltaic cell, this voltage and given voltage are compared, the pulse signal that is provided by pi regulator and PWM controller is adjusted the duty of DC/DC transducer, guarantee that by negative feedback mode photovoltaic cell works near the given working point all the time, realizes MPPT maximum power point tracking.
The circuit of described DC/DC transducer adopts Boost circuit or Buck circuit or Cuk circuit;
Described temperature sensor is selected LM35 or AD590 model for use.
Beneficial effect with respect to prior art is, adopt temperature sensor to detect photovoltaic battery temperature, and adjust the maximum power point voltage set-point according to institute's detected temperatures in real time according to the actual maximum power of photovoltaic cell point voltage-temperature characterisitic that records, overcome that traditional photovoltaic CVT controller temperature influence is serious, the problem of poor effect;
Compare with the patent of mentioning in the background technology 1 (based on the sun power maximal efficiency tracking circuit of CVT method), the present invention has considered temperature having a strong impact on photovoltaic cell capable of generating power especially, improved generating efficiency, strengthened the practicality of CVT control method, only increased temperature sensor and computing circuit, the circuit cost that increases is considerably less;
Compare precision height of the present invention, good stability, science practicality with the patent of mentioning in the background technology 2 (the time variant voltage photovoltaic system maximum power tracking and controlling method that adapts to weather conditions);
Compare with the patent of mentioning in the background technology 3 (a kind of method of tracing maximum power point of solar photovoltaic battery), Direct-Detection Optical volt battery temperature of the present invention, so degree of accuracy height, and do not need storage chip, and circuit structure is simple, and cost is lower.
Compare with the patent of mentioning in the background technology 4,5,6, what the present invention adopted is modified CVT control method, compares with disturbance observation, conductance increment method, genetic algorithm etc., and circuit is more simple and practical, and cost is lower, realization is convenient, and working stability is reliable.
Carry out technological improvement on traditional CVT control method basis, can not only well realize tracing maximum power of photovoltaic cell, can make again that circuit structure is simple, design convenience, stable and reliable operation, with low cost, practical.
Description of drawings
Fig. 1 is the photovoltaic effect schematic diagram;
Fig. 2 is photovoltaic translation circuit structured flowchart of the present invention;
Fig. 3 is circuit design drawing of the present invention;
Fig. 4 is circuit simulation figure of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Should adopt temperature sensor to detect photovoltaic battery temperature based on the sun power CVT control method of temperature detection, and adjust the maximum power point voltage set-point in real time according to the actual maximum power of photovoltaic cell point voltage-temperature characterisitic that records, simple in structure, stable and reliable operation, with low cost, practical according to institute's detected temperatures.
As shown in Figure 2, should be based on the sun power CVT control method of temperature detection, comprise photovoltaic battery array 1, DC/DC transducer 7, photovoltaic voltage detecting circuit 8, pi regulator 4, PWM controller 5, isolated drive circuit 6, temperature sensor 2, computing circuit 3, described photovoltaic battery array 1 is connected with DC/DC transducer 7, also be connected with temperature sensor 2 in turn between described photovoltaic battery array 1 and the DC/DC transducer 7, computing circuit 3, pi regulator 4, PWM controller 5, isolated drive circuit 6, by detecting photovoltaic battery temperature, calculate maximum power point voltage in real time by computing circuit and as the voltage given value according to linear characteristic between the actual maximum power of photovoltaic cell point voltage Um-temperature that records, thereby guarantee to change when causing photovoltaic battery temperature to change photovoltaic cell all the time with its corresponding peak power output electric energy in environmental factor;
Described photovoltaic voltage detecting circuit 8 is parallel between photovoltaic battery array 1 and the DC/DC transducer 7, described photovoltaic voltage detecting circuit 8 is connected with pi regulator 4, by detecting the output voltage of photovoltaic cell, this voltage and given voltage are compared, the pulse signal that is provided by pi regulator 4 and PWM controller 5 is adjusted the duty of DC/DC transducer 7, guarantee that by negative feedback mode photovoltaic cell works near the given working point all the time, realizes MPPT maximum power point tracking.
As shown in Figure 3, among the figure, PVOUT is the output terminal of solar-energy photo-voltaic cell array, and VTc is the output voltage signal of the temperature sensor LM35 of detection photovoltaic battery temperature, and the circuit of described DC/DC transducer adopts Boost circuit or Buck circuit or Cuk circuit; Described temperature sensor selects for use LM35 or AD590 model or other model temperature sensors to replace, and the type of restrictor device has not reduced cost to a certain extent.
As shown in Figure 4, adopt PSpice/ORCAD software that circuit of the present invention is carried out emulation, can verify the effect of this technical scheme, Figure 4 shows that simulation result, photovoltaic battery temperature situation of change for emulation is set is respectively 25 ℃, 50 ℃, 75 ℃, 100 ℃, 25 ℃.The output voltage waveforms of the photovoltaic battery array of realizing by technical solution of the present invention, as can be seen, the photovoltaic cell output voltage reduces along with the rising of battery temperature.The present invention has guaranteed that photovoltaic cell voltage is the best operating point under its corresponding temperature, on this working point, photovoltaic cell is brought into play its best photoelectric conversion efficiency, output function maximum, electric energy are maximum, thereby overcome the influence of temperature to photovoltaic cell capable of generating power, simultaneously with low cost, working stability is reliable, practical.
The above only is preferred implementation of the present invention, enable those skilled in the art to understand or realize the present invention, multiple modification to this embodiment will be apparent to one skilled in the art, under the situation that does not break away from the spirit or scope of the present invention, can realize in other embodiments, therefore, the present invention will can not be limited and embodiment illustrated herein, but will meet the wide region consistent with principle disclosed herein and features of novelty.
Claims (3)
1. sun power CVT control method based on temperature detection, it is characterized in that: comprise photovoltaic battery array, the DC/DC transducer, the photovoltaic voltage detecting circuit, pi regulator, the PWM controller, isolated drive circuit, temperature sensor, computing circuit, described photovoltaic battery array is connected with the DC/DC transducer, also be connected with temperature sensor in turn between described photovoltaic battery array and the DC/DC transducer, computing circuit, pi regulator, the PWM controller, isolated drive circuit, by detecting photovoltaic battery temperature, calculate maximum power point voltage in real time by computing circuit and as the voltage given value according to linear characteristic between the actual maximum power of photovoltaic cell point voltage Um-temperature that records, thereby guarantee to change when causing photovoltaic battery temperature to change photovoltaic cell all the time with its corresponding peak power output electric energy in environmental factor;
Described photovoltaic voltage detecting circuit is parallel between photovoltaic battery array and the DC/DC transducer, described photovoltaic voltage detecting circuit is connected with pi regulator, by detecting the output voltage of photovoltaic cell, this voltage and given voltage are compared, the pulse signal that is provided by pi regulator and PWM controller is adjusted the duty of DC/DC transducer, guarantee that by negative feedback mode photovoltaic cell works near the given working point all the time, realizes MPPT maximum power point tracking.
2. the sun power CVT control method based on temperature detection according to claim 1 is characterized in that: circuit employing Boost circuit or Buck circuit or the Cuk circuit of described DC/DC transducer.
3. the sun power CVT control method based on temperature detection according to claim 1, it is characterized in that: described temperature sensor is selected LM35 or AD590 model for use.
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| CN2012104337706A CN103294102A (en) | 2012-11-02 | 2012-11-02 | Solar CVT control method based on temperature detection |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103294103A (en) * | 2012-12-06 | 2013-09-11 | 许昌学院电气信息工程学院 | Solar controlled change time faze control method based on temperature detection |
| CN103701329A (en) * | 2014-01-14 | 2014-04-02 | 许昌学院 | Solar photovoltaic converter of phase-shifted full-bridge soft switch |
| CN107359690A (en) * | 2017-08-31 | 2017-11-17 | 泰州学院 | Control device based on maximum photovoltaic power point tracking |
| US20190052225A1 (en) * | 2017-08-13 | 2019-02-14 | The Aerospace Corporation | Intelligent solar cell carrier system for flight and laboratory measurement applications |
| CN111679713A (en) * | 2020-06-28 | 2020-09-18 | 齐鲁工业大学 | Photovoltaic maximum power point tracking method for direct calculation |
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| US6057665A (en) * | 1998-09-18 | 2000-05-02 | Fire Wind & Rain Technologies Llc | Battery charger with maximum power tracking |
| US20080257397A1 (en) * | 2007-04-17 | 2008-10-23 | John Stanley Glaser | System, method, and apparatus for extracting power from a photovoltaic source of electrical energy |
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| US6057665A (en) * | 1998-09-18 | 2000-05-02 | Fire Wind & Rain Technologies Llc | Battery charger with maximum power tracking |
| US20080257397A1 (en) * | 2007-04-17 | 2008-10-23 | John Stanley Glaser | System, method, and apparatus for extracting power from a photovoltaic source of electrical energy |
| EP2431832A1 (en) * | 2010-09-21 | 2012-03-21 | ABB Research Ltd | Method and arrangement for tracking the maximum power point of a photovoltaic module |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103294103A (en) * | 2012-12-06 | 2013-09-11 | 许昌学院电气信息工程学院 | Solar controlled change time faze control method based on temperature detection |
| CN103701329A (en) * | 2014-01-14 | 2014-04-02 | 许昌学院 | Solar photovoltaic converter of phase-shifted full-bridge soft switch |
| US20190052225A1 (en) * | 2017-08-13 | 2019-02-14 | The Aerospace Corporation | Intelligent solar cell carrier system for flight and laboratory measurement applications |
| US10615744B2 (en) * | 2017-08-13 | 2020-04-07 | The Aerospace Corporation | Intelligent solar cell carrier system for flight and laboratory measurement applications |
| CN107359690A (en) * | 2017-08-31 | 2017-11-17 | 泰州学院 | Control device based on maximum photovoltaic power point tracking |
| CN111679713A (en) * | 2020-06-28 | 2020-09-18 | 齐鲁工业大学 | Photovoltaic maximum power point tracking method for direct calculation |
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Application publication date: 20130911 |