CN102931836B - Wide-temperature compensation constant-voltage photovoltaic power generation system for implementing maximum power point tracking - Google Patents
Wide-temperature compensation constant-voltage photovoltaic power generation system for implementing maximum power point tracking Download PDFInfo
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- CN102931836B CN102931836B CN201210385278.6A CN201210385278A CN102931836B CN 102931836 B CN102931836 B CN 102931836B CN 201210385278 A CN201210385278 A CN 201210385278A CN 102931836 B CN102931836 B CN 102931836B
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- 238000010248 power generation Methods 0.000 title abstract description 7
- 239000003381 stabilizer Substances 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 8
- 238000005286 illumination Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
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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
Abstract
The invention discloses a wide-temperature compensation constant-voltage photovoltaic power generation system for implementing maximum power point tracking. The wide-temperature compensation constant-voltage photovoltaic power generation system comprises a temperature compensation circuit, a dynamic current-limiting circuit and a Buck converter, wherein the temperature compensation circuit is used for detecting ambient temperature in real time and supplying a temperature compensation signal to the current-limiting circuit; the dynamic current-limiting circuit dynamically controls input current of the Buck converter according to the temperature compensation signal supplied by the temperature compensation circuit; the Buck converter controls output voltage of a solar panel in the photovoltaic power generation system to remain the maximum power output voltage according to current dynamically input by the dynamic current-limiting circuit and then converts the output voltage of the solar panel into output voltage desired by the load. The wide-temperature compensation constant-voltage photovoltaic power generation system has the beneficial effects that Buck is used as a direct current converter to reduce the output voltage of the solar panel to the desired voltage; and the dynamic current-limiting circuit is used to control output voltage of a photovoltaic panel, so that the MPPT with high power density and high efficiency for the solar panel can be implemented.
Description
Technical field
The present invention relates to is that a kind of wide temperature range compensates constant pressure type photovoltaic generation MPPT and realizes system, and particularly one is applied to small-power photovoltaic generation for miniaturized electronics provides electric energy.
Background technology
Along with the day by day maturation of photovoltaic power generation technology, solar panel is directly utilized to provide electric power to be widely used in the various aspects of people's productive life.Traditional constant voltage tracing (CVT) method for designing ignores the impact of ambient temperature on solar panels open circuit voltage; by means of only the best effort open circuit voltage of solar cell under setting Normal Environmental Temperature ensure photovoltaic panel can Maximum Power Output, CVT mode have control simple, reliability is high, good stability and be easy to the advantages such as realization.But solar panel generally uses in the wild, the four seasons and day and night difference variation are very large.For monocrystalline silicon solar panels, when ambient temperature often raises 1 DEG C, its open circuit voltage rate of descent is 0.35% ~ 0.45%.And traditional CVT control method can not with the maximum power point of the change tracking solar panel of ambient temperature, solar panel utilance is not high.Under different intensities of illumination, ambient temperature exterior environmental conditions, the maximum power point (mpp) of solar panel can have a greater change, and therefore we need on traditional CVT control technology basis, to increase relevant control circuit to overcome the impact of ambient temperature on MPPT maximum power point tracking.Utilize the temperature variant pressure drop of sampling general-purpose diode to provide the variation tendency of photovoltaic panel maximum power point, but sample circuit required precision is high, controls complicated.And judge that MPPT does not meet the restriction of small-power photovoltaic generating system to volume and cost, can only be suitable for middle large-power occasions by increasing extra photovoltaic panel.
Along with the application of digit chip, be applicable to the MPPT technology comparatively ripe (as method such as fixed step size interference observation, conductance method etc.) of middle high-power photovoltaic system.The restriction of acceptor sum cost, the MPPT technology being applicable to small-power photovoltaic generating system then needs further research (application such as domestic miniature inverter, portable electronic charging device).The problems such as solar panel utilance, equipment cost, service efficiency and circuit protection should be considered for small-power photovoltaic generating system.The output characteristic of solar panel has stronger nonlinear characteristic, and along with the difference of intensity of illumination and ambient temperature, solar panel terminal voltage, output current and peak power output all can produce very large change.The small-power photovoltaic power generation equipment of current function admirable is on the high side, limits the application of solar energy generation technology in small-power occasion.Therefore need fully in conjunction with the operating characteristic of photovoltaic panel, research is applicable to the high-performance of small-power occasion, the control technology of low-cost solar charging device.
Summary of the invention
Technical problem to be solved by this invention is for small-power solar panel generating occasion, proposes low cost, high efficiency wide temperature range compensation constant pressure type solar panel MPPT implementation method.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
For realizing a wide temperature-compensating constant pressure type photovoltaic generating system of MPPT, comprise temperature-compensation circuit, dynamic current limiting circuit, Buck converter; Wherein said temperature-compensation circuit is used for real-time testing environment temperature, and the operating voltage of setting dynamic current limiting circuit, for dynamic current limiting circuit provides temperature compensation signal; The temperature compensation signal that described dynamic current limiting circuit provides according to temperature-compensation circuit, the input current of Dynamic controlling Buck converter; The electric current that Buck converter dynamically inputs according to dynamic current limiting circuit, the output voltage controlling solar panel in photovoltaic generating system remains on maximum power output voltage place, then the output voltage of solar panel is converted to the output voltage that load is expected.
Further, wide temperature-compensating constant pressure type photovoltaic generating system for realizing MPPT of the present invention, described temperature-compensation circuit is made up of the first to the 5th resistance, voltage-stabiliser tube, the first electric capacity and comparator, and the normal phase input end of wherein said comparator is connected with one end of the second resistance, one end of the 3rd resistance, one end of the 4th resistance respectively; The positive output end of described comparator respectively with one end of the first resistance, the other end of the second resistance, the other end of the 3rd resistance, one end of the 5th resistance connect; The inverting input of described comparator is connected with the other end of the first resistance, the negative electrode of voltage-stabiliser tube respectively; Ground connection after the reversed-phase output of described comparator is connected with the anode of voltage-stabiliser tube, the other end of the 4th resistance, one end of the first electric capacity respectively; The voltage output end of described comparator is connected with the other end of the first electric capacity, the other end of the 5th resistance respectively; Wherein the second resistance is negative temperature coefficient resister NTC, and described temperature-compensation circuit, by the real-time testing environment temperature of negative temperature coefficient resister NTC, controls the output voltage of comparator.
Further, the wide temperature-compensating constant pressure type photovoltaic generating system for realizing MPPT of the present invention, described dynamic current limiting circuit is by the 6th resistance, the second electric capacity and a P channel mosfet is parallel with one another forms; Temperature-compensation circuit is by the gate voltage of control the one P channel mosfet, allow a MOSFET be operated in linear zone different conditions and obtain different resistance values, the current-limiting resistance of Buck converter is jointly formed after this resistance value and the 6th resistor coupled in parallel, the input current of Dynamic controlling Buck converter, make solar panel always work in optimum output voltage point, realize the MPPT function of solar panel work.
Further, wide temperature-compensating constant pressure type photovoltaic generating system for realizing MPPT of the present invention, described Buck converter comprises photovoltaic panel, input inductance, the 7th to the tenth resistance, the 3rd to the 6th electric capacity, fly-wheel diode, the 2nd P channel mosfet and control chip;
1st pin of wherein said control chip is connected with the output of dynamic current limiting circuit;
One end of described photovoltaic panel is connected with the 8th pin of the source electrode of one end of one end of the 7th resistance, the 3rd electric capacity, the 2nd P channel mosfet, one end of the 4th electric capacity, one end of the 5th electric capacity and control chip respectively;
The other end of described 4th electric capacity is connected with the 7th pin of control chip; The other end ground connection of described 5th electric capacity;
Ground connection after the other end of described photovoltaic panel is connected with the other end of the 3rd electric capacity, the anode of fly-wheel diode, one end of the 6th electric capacity, one end of the 8th resistance, one end of the tenth resistance respectively;
The grid of described 2nd P channel mosfet is connected with the 6th pin of control chip;
The drain electrode of described 2nd P channel mosfet is connected with one end of input inductance, the negative electrode of fly-wheel diode, the 5th pin of control chip respectively;
The other end of described input inductance is connected with the other end of the 6th electric capacity, the other end of the 8th resistance, one end of the 9th resistance respectively;
The other end of described 9th resistance is connected with the other end of the tenth resistance, the 3rd pin of control chip respectively;
The other end of described 7th resistance is connected with the 2nd pin of control chip;
4th pin ground connection of described control chip.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
The present invention has the advantage that circuit element is few, power density is high and cost is low, there is provided signal by thermistor Real-Time Monitoring ambient temperature and for dynamic current limiting circuit, utilize the linear work district adjustment current-limiting resistance of controls P channel mosfet pipe to be conducive to the MPPT realizing high power density, high efficiency and solar panel.
Accompanying drawing explanation
Fig. 1 is principle framework schematic diagram of the present invention.
Fig. 2 is that solar panel voltage, electric current and power vary with temperature schematic diagram.Wherein the (a) and (b) of Fig. 2 be respectively when ambient temperature one timing, under different illumination conditions on photovoltaic panel export electrical characteristic affect schematic diagram.
Fig. 3 is the circuit topological structure schematic diagram of the preferred embodiments of the present invention implementation method.Number in the figure: 301-temperature-compensation circuit; 302-dynamic current limiting circuit; 303-Buck converter circuit.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
As shown in Figure 1, which show principle framework figure of the present invention.Light energy conversion is electric energy and forms output voltage at output by photovoltaic panel; By negative tempperature coefficient thermistor NTC testing environment temperature, for dynamic current limiting circuit provides reference signal; The current-limiting resistance of dynamic electric resistor current limliting link dynamic adjustments Buck converter; Buck converter controls solar panel output voltage by control inputs power; The output voltage of Buck converter provides the operating voltage of expectation for load.
The typical electric characteristic figure of solar panel as shown in Figure 2, its output characteristic visible has stronger nonlinear characteristic, along with the difference of intensity of illumination and ambient temperature, solar panel terminal voltage, output current and peak power output all can produce very large change.When ambient temperature one timing, under different illumination conditions, the impact of electrical characteristic is exported as shown in the (a) and (b) of Fig. 2 to photovoltaic panel.Different intensities of illumination only has the greatest impact output current, and the impact of open-circuit voltage can be ignored.Illumination is stronger, and the exportable maximum power point of panel is higher.And the output voltage V corresponding to maximum power point
pmcan be similar to and think constant.When intensity of illumination one timing, under varying environment temperature conditions, the impact of electrical characteristic is exported on photovoltaic panel: different ambient temperatures only has the greatest impact output voltage, and can ignore on the impact of short circuit current.Ambient temperature is lower, and the exportable maximum power point of panel is higher.Maximum power point and the output voltage V corresponding to it
pmthere is identical linear trends of change.
As shown in Figure 3, a kind of wide temperature range which show preferred embodiment of the present invention compensates constant pressure type photovoltaic generation MPPT implementation method schematic diagram.
The function of block diagram 301, for providing wide temperature-compensation circuit, is made up of resistance R1-R5, voltage-stabiliser tube Z1, electric capacity C1 and comparator IC2, and wherein R2 is negative temperature coefficient resister (NTC).Temperature-compensation circuit, by the real-time testing environment temperature of NTC resistance, controls the output voltage of comparator IC2.
The function of block diagram 302, for providing dynamic current limiting circuit, is made up of resistance R6, electric capacity C2 and P channel mosfet Q1.The gate voltage of temperature-compensation circuit control Q1 pipe, by allowing the work of Q1 pipe obtain different resistance values at linear zone different conditions, obtains different current-limiting resistances afterwards from resistance R6 parallel connection.
The function of block diagram 303 is the output voltage output voltage of solar panel being converted to expectation, the Buck converter be made up of resistance R7-R10, electric capacity C3-C6, inductance L 1, sustained diode 2, P channel mosfet Q2 and control chip IC1.Be made up of the current-limiting resistance of IC1 control chip Q1 and resistance R6, the input current of Dynamic controlling Buck converter, realize the MPPT function of solar panel work.
The design parameter of preferred embodiment of the present invention is as follows:
Solar panel input voltage is 8VDC-19VDC; Output voltage 5VDC; Output current 1A; Output inductor L1 is 68 μ H; Output filter capacitor C1 is 1000 μ F; Current limliting P channel mosfet is Si2343; Main switch Q2 is Si4485; IC1 control chip is LM25085, and the switching frequency of setting is 300kHz; IC2 control chip is comparator LM2903.
In the present invention, Buck converter expects voltage for solar panel output voltage being down to load end; Described temperature-compensation circuit link is testing environment temperature, provides temperature compensation signal; The temperature compensation signal of described dynamic current limiting circuit link for providing according to temperature-compensation circuit, the linear work district of control P channel mosfet, the input current of setting Buck converter, remains on maximum power output voltage place by the output voltage of solar panel.
Claims (3)
1., for realizing a wide temperature-compensating constant pressure type photovoltaic generating system of MPPT, it is characterized in that: comprise temperature-compensation circuit, dynamic current limiting circuit, Buck converter; Wherein said temperature-compensation circuit is used for real-time testing environment temperature, and the operating voltage of setting dynamic current limiting circuit, for dynamic current limiting circuit provides temperature compensation signal; The temperature compensation signal that described dynamic current limiting circuit provides according to temperature-compensation circuit, the input current of Dynamic controlling Buck converter; The electric current that Buck converter dynamically inputs according to dynamic current limiting circuit, the output voltage controlling solar panel in photovoltaic generating system remains on maximum power output voltage place, then the output voltage of solar panel is converted to the output voltage that load is expected;
Described temperature-compensation circuit is made up of the first to the 5th resistance (R1-R5), voltage-stabiliser tube (Z1), the first electric capacity (C1) and comparator (IC2), and the normal phase input end of wherein said comparator (IC2) is connected with one end of the second resistance (R2), one end of the 3rd resistance (R3), one end of the 4th resistance (R4) respectively; The positive output end of described comparator (IC2) respectively with one end of the first resistance (R1), the other end of the second resistance (R2), the other end of the 3rd resistance (R3), one end of the 5th resistance (R5) connect; The inverting input of described comparator (IC2) is connected with the other end of the first resistance (R1), the negative electrode of voltage-stabiliser tube (Z1) respectively; Ground connection after the reversed-phase output of described comparator (IC2) is connected with the anode of voltage-stabiliser tube (Z1), the other end of the 4th resistance (R4), one end of the first electric capacity (C1) respectively; The voltage output end of described comparator (IC2) is connected with the other end of the first electric capacity (C1), the other end of the 5th resistance (R5) respectively; Wherein the second resistance (R2) is negative temperature coefficient resister NTC, and described temperature-compensation circuit, by the real-time testing environment temperature of negative temperature coefficient resister NTC, controls the output voltage of comparator (IC2).
2. the wide temperature-compensating constant pressure type photovoltaic generating system for realizing MPPT according to claim 1, is characterized in that: described dynamic current limiting circuit is by the 6th resistance (R6), the second electric capacity (C2) and a P channel mosfet (Q1) is parallel with one another forms; Temperature-compensation circuit is by the gate voltage of control the one P channel mosfet (Q1), allow a MOSFET(Q1) be operated in linear zone different conditions and obtain different resistance values, the current-limiting resistance of Buck converter is jointly formed after this resistance value is in parallel with the 6th resistance (R6), the input current of Dynamic controlling Buck converter, make solar panel always work in optimum output voltage point, realize the MPPT function of solar panel work.
3. the wide temperature-compensating constant pressure type photovoltaic generating system for realizing MPPT according to claim 1, is characterized in that: described Buck converter comprises photovoltaic panel, input inductance (L1), the 7th to the tenth resistance (R7-R10), the 3rd to the 6th electric capacity (C3-C6), fly-wheel diode (D1), the 2nd P channel mosfet (Q2) and control chip (IC1);
1st pin of wherein said control chip (IC1) is connected with the output of dynamic current limiting circuit;
One end of described photovoltaic panel is connected with one end of the source electrode of one end of one end of the 7th resistance (R7), the 3rd electric capacity (C3), the 2nd P channel mosfet (Q2), the 4th electric capacity (C4), one end of the 5th electric capacity (C5) and the 8th pin of control chip (IC1) respectively;
The described other end of the 4th electric capacity (C4) is connected with the 7th pin of control chip (IC1); The other end ground connection of described 5th electric capacity (C5);
Ground connection after the other end of described photovoltaic panel is connected with the other end of the 3rd electric capacity (C3), the anode of fly-wheel diode (D1), one end of the 6th electric capacity (C6), one end of the 8th resistance (R8), one end of the tenth resistance (R10) respectively;
The described grid of the 2nd P channel mosfet (Q2) is connected with the 6th pin of control chip (IC1);
The drain electrode of described 2nd P channel mosfet (Q2) is connected with one end of input inductance (L1), the negative electrode of fly-wheel diode (D1), the 5th pin of control chip (IC1) respectively;
The other end of described input inductance (L1) is connected with the other end of the 6th electric capacity (C6), the other end of the 8th resistance (R8), one end of the 9th resistance (R9) respectively;
The other end of described 9th resistance (R9) is connected with the other end of the tenth resistance (R10), the 3rd pin of control chip (IC1) respectively;
The described other end of the 7th resistance (R7) is connected with the 2nd pin of control chip (IC1);
4th pin ground connection of described control chip (IC1).
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2804828Y (en) * | 2005-05-25 | 2006-08-09 | 西北工业大学 | Equipment for temp compensation in large |
| CN101236446A (en) * | 2008-02-28 | 2008-08-06 | 上海交通大学 | Voltage-variable photovoltaic system maximal power tracing control method adapting to weather status |
| CN101505565A (en) * | 2009-03-11 | 2009-08-12 | 华中科技大学 | SoC chip for independent photovoltaic LED lighting special controller |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2804828Y (en) * | 2005-05-25 | 2006-08-09 | 西北工业大学 | Equipment for temp compensation in large |
| CN101236446A (en) * | 2008-02-28 | 2008-08-06 | 上海交通大学 | Voltage-variable photovoltaic system maximal power tracing control method adapting to weather status |
| CN101505565A (en) * | 2009-03-11 | 2009-08-12 | 华中科技大学 | SoC chip for independent photovoltaic LED lighting special controller |
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