CN102073325A - Biaxial automatic tracking device and method for maximum power point of solar panel - Google Patents
Biaxial automatic tracking device and method for maximum power point of solar panel Download PDFInfo
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Abstract
The invention discloses a biaxial automatic tracking device and a biaxial automatic tracking method for a maximum power point of a solar panel. The device comprises a pre-starting module, a sun detection module, a position control module, a driving module, a maximum power point control module, a maximum power point tracking module and a power module, wherein both the pre-starting module and the sun detection module consist of optic probe circuits; both the position control module and the maximum power point control module consist of singlechip circuits and 16-bit interruption circuits; the driving module consists of a direct current motor driving circuit; and the maximum power point tracking module consists of a solar cell panel circuit and a circuit with a maximum power point tracking (MPPT) function. In the method, the position of the sun is tracked along the vertical direction and the horizontal direction; a solar cell panel is driven to be perpendicular to light; and the maximum output power point of the solar cell panel is tracked by a perturbation and observation method to utilize converted solar energy to the greatest extent. By the device and the method, the utilization efficiency of the solar energy can be effectively improved; and the device has a simple structure, is low in cost and has great application and popularization values.
Description
Technical field
The present invention relates to application of solar, relate in particular to a kind of automatic follow-up mechanism of solar panels maximum power point twin shaft and method.
Background technology
Sun power is considered to be the abundant and the most potential regenerative resource in the whole world, and it has the advantage of cleanliness without any pollution, and its development and use are subjected to the extensive attention of countries in the world always.Solar energy utilization system is mainly by collecting, store and change the utilization that realizes sun power, yet it exists the problem that intermittence direction of illumination intensity constantly changes in time in actual applications, and this just has higher requirement to the collection and the use device of sun power.At present a lot of solar panel arrays are all fixed basically, can not make full use of solar energy resources, and generating efficiency is low.According to test, in solar electrical energy generation, under the same terms, adopt of the generated energy raising 35% of the generating set of automatic tracking system than stationary power generation equipment, cost descends 25%.Therefore, in sun power utilized, it was necessary using tracker, and this also makes solar tracking system become hot research in recent years.
Application number is that 201020130889.2 Chinese utility model patent discloses a kind of sunshine automatic tracking system, this system comprises base, pillar, the location arbor wheel, solar panel, motor, rotation axis, the sunshine detection means, control module and energy storage device, pillar is fixedly arranged on the base, this post top portion is provided with the location arbor wheel, motor also is arranged on the base, and by driving the rotation of transmission gear drive rotation axis, this rotation axis is fixedlyed connected with solar panel, the sunshine detection means comprises external detector and interior detectors, control module is arranged at the solar panel bottom and by lead and sunshine detection means, motor and location arbor wheel are connected, and arrive in the outside energy storage device by the conduct electrical energy of lead with conversion of solar energy.In this patent, when the external detector that is placed on the solar panel outside has detected sunshine, promptly send signal and give control module, send the control signal actuating motor by control module again, and then drive transmission gear and drive rotation axis, thereby drive solar panel also rotate together so that change solar panel towards.Adopt this device to have following problem: (1) this device only can the enterprising line trace at the position angle, can not adjust on the elevation angle between the sun and the ground level, exists the shortcoming that tracking accuracy is not high, cumulative errors is big; (2) this device just begins the collection of sun power after the position of sun adjustment finishes, and no longer the solar panels output power is followed the tracks of, and adopts this method not realize the maximization of solar panels output power.
Therefore, study a kind of tracking accuracy height, effect stable and automatic follow-up mechanism of solar panels maximum power point twin shaft and method that the sun power maximization can be transformed and have high theory and practical significance.
Summary of the invention
The shortcoming that one object of the present invention is to overcome prior art provides a kind of solar panels maximum power point twin shaft automatic follow-up mechanism with not enough, and it has the tracking accuracy height, effect is stable, the advantage that the sun power maximization can be transformed.
Another object of the present invention provides a kind of solar panels maximum power point twin shaft method for automatic tracking based on said apparatus.
Purpose of the present invention realizes by following technical scheme: the automatic follow-up mechanism of a kind of solar panels maximum power point twin shaft, comprise the pretrigger module that is used to determine whether to start tracing system, be used to detect the sun detection module of current position of sun and light intensity, be used for driver module being sent the position control module of control signal according to sun detection module information, be used to drive exterior mechanical topworks and make the solar panel driver module vertical with sunray, be used for the enabling signal that the receiving position control module sent and control solar panel is only externally exported electric energy at its maximum power point place maximum power point control module, be used for the MPPT maximum power point tracking module that solar panel output power maximum point is followed the tracks of, be used for power module that each module is powered, described pretrigger module and sun detection module are formed by the light probe circuit; Described position control module and maximum power point control module are formed by single chip circuit and 16 interrupt circuits; Described driver module is made up of direct current motor drive circuit; Described MPPT maximum power point tracking module is made up of solar panel circuit and the circuit with MPPT function; Described power module is made up of power switch circuit; Pretrigger module, sun detection module, position control module, driver module and exterior mechanical topworks are connected successively, and position control module, maximum power point control module and MPPT maximum power point tracking module are connected successively, and power module is connected with each module; Described maximum power point control module links to each other with outside energy storage device by lead.
Light probe circuit in the described pretrigger module is made up of four photodiodes, is used for when light shines on any one photodiode, and outwards the output low level signal is given power module and sun detection module.
The main circuit of the light probe circuit in the described sun detection module is made up of photoresistance, is divided into nine zones, several photoresistance in parallel of each zone, and the photoresistance of adjacent area is independent mutually; The circuit board of this circuit is the round sealed device, only has a vertical hole at circle centre position.When light shines the zone by this hole in, on arbitrary resistance the time, can cause this zone resistance to reduce rapidly, thereby all-in resistance is reduced rapidly, thereby cause the variation of voltage.
Single-chip microcomputer in described position control module and the maximum power point control module adopts the ATMega16 single-chip microcomputer, and 16 interrupt circuits adopt 74LS148 and two kinds of chips of 74LS08.Adopt above-mentioned single-chip microcomputer and interrupt circuit can make number of interruptions can satisfy the requirement of application.
74LS148 chip in described 16 interrupt circuits is a 8-3 line priority encoder, and the 74LS08 chip is four two inputs and door, and the priority of this interrupt circuit is successively decreased successively from the 16-1 end.
It is the driving circuit of core that direct current generator in the described driver module adopts NE555D and TLP559, characteristics such as the on-load ability is strong, adjusting control is convenient that it has.
The circuit that has the MPPT function in the described MPPT maximum power point tracking module is composed in series by BOOST circuit and BOOST-BUCK circuit, comprise current sampling, voltage sampling and driving circuit and PWM controller, BOOST circuit and BOOST-BUCK circuit with two-way PWM control series connection, carry out current sampling from first order BOOST circuit wherein, and drive BOOST circuit and BOOST-BUCK circuit respectively.
Described power module is made up of power switch circuit, and power switch circuit comprises accumulator and the mu balanced circuit that is connected with accumulator.
A kind of solar panels maximum power point twin shaft method for automatic tracking based on said apparatus may further comprise the steps
(1) pretrigger: judge whether the light probe circuit in the pretrigger module has low level signal output, if having, then signal is passed to power module, and power module begins whole tracing system is powered, and begins to start sun detection module simultaneously;
(2) sun location tracking: sun detection module passes to position control module with the position and the intensity of illumination information of the detected current sun, position control module is compared the positional information of these information and current solar panels, obtain making solar panels perpendicular to required mobile horizontal direction of sunray and the displacement information on the vertical direction, then this information is sent to driver module, driver module is adjusted with the direct current generator on the vertical both direction with the displacement information driving level on the vertical direction according to horizontal direction respectively, moves thereby drive exterior mechanical topworks; After treating that the mobile realization solar panels that finish are perpendicular to sunray, driver module is given position control module with the signal feedback that direct current generator stops to move, position control module passes to the maximum power point control module with this signal, is used to begin the tracking of maximum power point;
(3) MPPT maximum power point tracking: the maximum power point control module is after receiving that direct current generator that position control module sends stops movable signal, the MPPT maximum power point tracking module begins to control, the control method that adopts is the disturbance observation, be specially: by the circuit that has the MPPT function in the MPPT maximum power point tracking module is applied disturbance, change the duty of solar panel, Real Time Observation and calculate the size of solar panel output power then, result of calculation and last time point are compared, on this basis or keep or change control next step disturbance direction, thereby make the output of solar panel finally be stabilized near the maximum power point; After treating that output power is stable, maximum power point control module control solar panel is only externally exported electric energy at its maximum power point place;
(4) electric energy output: when the output of solar panel was stabilized near the maximum power point, the maximum power point control module passed in the energy storage device of outside by the electric energy of lead with conversion of solar energy.
The present invention compared with prior art has following advantage and beneficial effect:
1, the present invention can adjust the solar panel direction according to the sunshine direction automatically, follows the tracks of solar azimuth at the vertical direction axle, and the horizontal direction axle is followed the tracks of sun altitude, and the sun power maximization is transformed, and improves the acquisition rate of sun power.
2, the circuit of utilization of the present invention with MPPT function adopts the disturbance observation to follow the tracks of maximum power point, can make the peak power that system can both the tracking solar battery under any temperature and sunshine condition, the sun power maximum using of coming out will be transformed, and the dutycycle size can be set more flexibly, and can be easy to choose device.Even cross when low in input voltage moment in addition, this circuit also can be exported normal voltage, the powerful switching power circuit of satisfying the demand.
3, the present invention is simple in structure, cost is low, be applicable to hillside orchard, Agro-ecology garden and other shortage active electrical source supply, the field that can utilize solar energy resources to use is particularly suitable for Changes in weather more complicated and unattended environment, and very high promotional value is arranged.
Description of drawings
Fig. 1 is the illustrative view of functional configuration of apparatus of the present invention;
Fig. 2 is the exterior mechanical topworks synoptic diagram of apparatus of the present invention;
Fig. 3 is the circuit diagram of pretrigger module in apparatus of the present invention;
Fig. 4 is the light probe circuit diagram of sun detection module in apparatus of the present invention;
Fig. 5 is the light probe circuit model figure of sun detection module in apparatus of the present invention;
Fig. 6 is the single-chip microcomputer working circuit diagram of control module in apparatus of the present invention;
Fig. 7 is 16 interrupt circuit figure of control module in apparatus of the present invention;
Fig. 8 is the direct current motor drive circuit figure of driver module in apparatus of the present invention;
Fig. 9 is the MPPT circuit diagram of tracking module in apparatus of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
As shown in Figure 1, the automatic follow-up mechanism of a kind of solar panels maximum power point twin shaft, comprise the pretrigger module that is used to determine whether to start tracing system, be used to detect the sun detection module of current position of sun and light intensity, be used for driver module being sent the position control module of control signal according to sun detection module information, be used to drive exterior mechanical topworks and make the solar panel driver module vertical with sunray, be used for the enabling signal that the receiving position control module sent and control solar panel is only externally exported electric energy at its maximum power point place maximum power point control module, be used for the MPPT maximum power point tracking module that solar panel output power maximum point is followed the tracks of, be used for power module that each module is powered, described pretrigger module and sun detection module are formed by the light probe circuit; Described position control module and maximum power point control module are formed by single chip circuit and 16 interrupt circuits; Described driver module is made up of direct current motor drive circuit; Described MPPT maximum power point tracking module is made up of solar panel circuit and the circuit with MPPT function; Described power module is made up of power switch circuit; Pretrigger module, sun detection module, position control module, driver module and exterior mechanical topworks are connected successively, and position control module, maximum power point control module and MPPT maximum power point tracking module are connected successively, and power module is connected with each module; Described maximum power point control module links to each other with outside energy storage device by lead.
As shown in Figure 2, the structural representation of the exterior mechanical topworks that drives for apparatus of the present invention driver module, the base plate 11 of this device is provided with 4 mounting holes 9, base plate 11 is fixedlyed connected with ground by these mounting holes 9, on base plate 11, be placed with horizontal circumferencial direction and adjust direct current generator 8, this motor is connected with horizontal direction turning axle 6, be used to make the solar panel 1 at top to carry out the interior rotation of surface level, solar panel 1 is arranged on the top of horizontal direction turning axle 6, back to a side of the sun vertical direction is installed at solar panel 1 and adjusts direct current generator 5, vertical rotating shaft 2, vertical direction rotary stopper fixed bar 3 and semicircular gear bar 4.After position control module passes to driver module with required adjustment positional information, driver module passes to horizontal circumferencial direction adjustment direct current generator 8 and vertical direction adjustment direct current generator 5 with horizontal direction and vertical direction information respectively, horizontal circumferencial direction is adjusted direct current generator 8 driving horizontal direction turning axles 6 and is rotated, thereby moves to assigned address; Vertical direction is adjusted direct current generator 5 driving vertical rotating shafts 2 and is rotated, driving semicircular gear bar 4 rotates, thereby make the solar panel 1 on top produce luffing, after waiting to rotate to assigned address, fix by 3 pairs of solar panels 1 of vertical direction rotary stopper fixed bar.7 pairs of each parts of electric cabinet that are provided with by the bottom in above-mentioned position fixing process are powered.In addition, in order to guarantee safety and to reduce ectocine, adjust on the direct current generator at horizontal circumferencial direction and be provided with protective cover 10.
As shown in Figure 3, the light probe circuit in the described pretrigger module is made up of four photodiodes, is used for when light shines on any one photodiode, and outwards the output low level signal is given power module and sun detection module.Its principle of work is as follows: four photodiodes are connected on as shown in Figure 3 P19 respectively to the P22 interface by lead.When the resistance of four potentiometers being transferred to when suitable, in case when light shone on the photodiode, the voltage of corresponding potentiometer will be greater than 3 volts, the voltage that promptly is passed to the CD40106 chip is high level, through the shaping of CD40106 and anti-phase after, the level signal of outputting standard.Then this four road signal again through one four input with door---the judgement signal that 74LS21 output is final.Any one is arrived four photodiodes by irradiate light, and the output of 74LS21 all is low level, shows that system detects sunlight, the beginning powered operation.
As shown in Figure 4 and Figure 5, the main circuit of the light probe circuit in the described sun detection module is made up of photoresistance, be divided into nine zones (0,1,2,3,4, A, B, C, D), each zone several photoresistance in parallel, the photoresistance of adjacent area is independent mutually; The circuit board of this circuit is the round sealed device, only has a vertical hole at circle centre position (directly over 0 district).When light shines the zone by this hole in, on arbitrary resistance the time, can cause this zone resistance to reduce rapidly, thereby all-in resistance is reduced rapidly, thereby cause the variation of voltage, thereby the electromotive force that A is ordered changes.When the resistance of potentiometer was transferred to desired value, illumination was in photoresistance the time, and the electromotive force that A is ordered is greater than 3V.The TCL374 chip is a voltage comparator.The electromotive force of ordering as A is during greater than 3V, and its output is a high level.It is anti-phase that this high level passes through CD 40106 chips again, finally in low level of output terminal output.
Position control module and maximum power point control module are formed by single chip circuit and 16 interrupt circuits, and single-chip microcomputer adopts ATMega16 type single-chip microcomputer as shown in Figure 6,16 interrupt circuit employings 74LS148 chip and 74LS08 chip as shown in Figure 7.Single machine output end is connected with the input port of direct current motor drive circuit in the driver module.
The sun current location that single-chip microcomputer goes out according to the light probe electric circuit inspection makes solar panel face the sun thereby drive direct current generator, has improved solar energy utilization rate effectively.The core work circuit of present embodiment adopts ATMega16 type single-chip microcomputer, its single-chip minimum system circuit such as Fig. 6.Wherein the single-chip processor i/o input port comprises PC0-PC7 and nine input ports of PD7, and PB0-PB7 is an output port, connects direct current motor drive circuit.
Because the number of interruptions requirement that the interruption of single chip computer AT Mega16 inside does not reach native system far away, so native system is at the outside interrupt control circuit of interpolation that needs of single-chip microcomputer, as shown in Figure 5.What this interrupt circuit adopted is 74LS148 chip and 74LS08 chip.74LS148 chip 221 is 8-3 line priority encoders, and 74LS08 chip 222 is four two inputs and door.The priority of this interrupt circuit is successively decreased successively from the 16-1 end.The corresponding relation such as the following table of 16-1 end and light probe circuit:
Table 1 terminal interface and light probe corresponding relation
As shown in Figure 8, it is the driving circuit of core that described direct current generator adopts NE555D and TLP559, characteristics such as the on-load ability is strong, adjusting control is convenient that it has.
Described tracking module is made up of solar panel and the circuit with MPPT function, the circuit that wherein has the MPPT function is composed in series by BOOST circuit and BOOST-BUCK circuit, BOOST circuit and BOOST-BUCK circuit are as shown in Figure 9, circuit with MPPT function comprises current sampling, voltage sampling and driving circuit and PWM controller, BOOST circuit and BOOST-BUCK circuit with two-way PWM control series connection, carry out current sampling from first order BOOST circuit wherein, and drive BOOST circuit and BOOST-BUCK circuit respectively, wherein the BOOST circuit is used to carry out MPPT maximum power point tracking.The BOOST circuit is realized the purpose that load voltage raises with inductive current source side formula to load discharge, and simple in structure, the switching tube design of drive circuit is simple.The BOOST-BUCK circuit input end is operated in on-off state, solar battery array output terminal storage capacitor in parallel with guarantee the solar battery array output current continuously.When power device turn-offed, solar battery array charged to storage capacitor, made solar battery array be in generating state all the time.Realize regulating the purpose of solar battery array output average power by the dutycycle of regulating the BOOST-BUCK circuit, thereby realize MPPT function solar battery array.
Power module is made up of power switch circuit described in the present embodiment, and power switch circuit comprises accumulator and the mu balanced circuit that is connected with accumulator.
A kind of solar panels maximum power point twin shaft method for automatic tracking based on said apparatus may further comprise the steps:
(1) pretrigger: judge whether the light probe circuit in the pretrigger module has low level signal output, if having, then signal is passed to power module, and power module begins whole tracing system is powered, and begins to start sun detection module degree simultaneously;
(2) sun location tracking: sun detection module passes to position control module with the position and the intensity of illumination information of the detected current sun, position control module is compared the positional information of these information and current solar panels, obtain making solar panels perpendicular to required mobile horizontal direction of sunray and the displacement information on the vertical direction, then this information is sent to driver module, driver module is adjusted with the direct current generator on the vertical both direction with the displacement information driving level on the vertical direction according to horizontal direction respectively, moves thereby drive exterior mechanical topworks; After treating that the mobile realization solar panels that finish are perpendicular to sunray, driver module is given position control module with the signal feedback that direct current generator stops to move, position control module passes to the maximum power point control module with this signal, is used to begin the tracking of maximum power point;
(3) MPPT maximum power point tracking: the maximum power point control module is after receiving that direct current generator that position control module sends stops movable signal, the MPPT maximum power point tracking module begins to control, the control method that adopts is the disturbance observation, be specially: by the circuit that has the MPPT function in the MPPT maximum power point tracking module is applied disturbance, change the duty of solar panel, Real Time Observation and calculate the size of solar panel output power then, result of calculation and last time point are compared, on this basis or keep or change control next step disturbance direction, thereby make the output of solar panel finally be stabilized near the maximum power point; After treating that output power is stable, maximum power point control module control solar panel is only externally exported electric energy at its maximum power point place;
(4) electric energy output: when the output of solar panel was stabilized near the maximum power point, the maximum power point control module passed in the energy storage device of outside by the electric energy of lead with conversion of solar energy.
The foregoing description is a preferred implementation of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (10)
1. automatic follow-up mechanism of solar panels maximum power point twin shaft, it is characterized in that, comprise the pretrigger module that is used to determine whether to start tracing system, be used to detect the sun detection module of current position of sun and light intensity, be used for driver module being sent the position control module of control signal according to sun detection module information, be used to drive exterior mechanical topworks and make the solar panel driver module vertical with sunray, be used for the enabling signal that the receiving position control module sent and control solar panel is only externally exported electric energy at its maximum power point place maximum power point control module, be used for the MPPT maximum power point tracking module that solar panel output power maximum point is followed the tracks of, be used for power module that each module is powered, described pretrigger module and sun detection module are formed by the light probe circuit; Described position control module and maximum power point control module are formed by single chip circuit and 16 interrupt circuits; Described driver module is made up of direct current motor drive circuit; Described MPPT maximum power point tracking module is made up of solar panel circuit and the circuit with MPPT function; Described power module is made up of power switch circuit; Pretrigger module, sun detection module, position control module, driver module and exterior mechanical topworks are connected successively, and position control module, maximum power point control module and MPPT maximum power point tracking module are connected successively, and power module is connected with each module; Described maximum power point control module links to each other with outside energy storage device by lead.
2. the automatic follow-up mechanism of solar panels maximum power point twin shaft according to claim 1, it is characterized in that, light probe circuit in the described pretrigger module is made up of four photodiodes, be used for when light shines on any one photodiode, outwards the output low level signal is given power module and sun detection module.
3. the automatic follow-up mechanism of solar panels maximum power point twin shaft according to claim 1, it is characterized in that, the main circuit of the light probe circuit in the described sun detection module is made up of photoresistance, be divided into nine zones, several photoresistance in parallel of each zone, the photoresistance of adjacent area is independent mutually.
4. the automatic follow-up mechanism of solar panels maximum power point twin shaft according to claim 3 is characterized in that the circuit board of the light probe circuit in the described sun detection module is the round sealed device, only has a vertical hole at circle centre position.
5. the automatic follow-up mechanism of solar panels maximum power point twin shaft according to claim 1, it is characterized in that, single-chip microcomputer in described position control module and the maximum power point control module adopts the ATMega16 single-chip microcomputer, and 16 interrupt circuits adopt 74LS148 and two kinds of chips of 74LS08.
6. the automatic follow-up mechanism of solar panels maximum power point twin shaft according to claim 1, it is characterized in that, 74LS148 chip in described 16 interrupt circuits is a 8-3 line priority encoder, and the 74LS08 chip is four two inputs and door, and the priority of this interrupt circuit is successively decreased successively from the 16-1 end.
7. the automatic follow-up mechanism of solar panels maximum power point twin shaft according to claim 1 is characterized in that, it is the driving circuit of core that the direct current generator in the described driver module adopts NE555D and TLP559.
8. the automatic follow-up mechanism of solar panels maximum power point twin shaft according to claim 1, it is characterized in that, the circuit that has the MPPT function in the described MPPT maximum power point tracking module is composed in series by BOOST circuit and BOOST-BUCK circuit, comprise current sampling, voltage sampling and driving circuit and PWM controller, BOOST circuit and BOOST-BUCK circuit with two-way PWM control series connection, carry out current sampling from first order BOOST circuit wherein, and drive BOOST circuit and BOOST-BUCK circuit respectively.
9. the automatic follow-up mechanism of solar panels maximum power point twin shaft according to claim 1 is characterized in that described power module is made up of power switch circuit, and power switch circuit comprises accumulator and the mu balanced circuit that is connected with accumulator.
10. the solar panels maximum power point twin shaft method for automatic tracking based on said apparatus is characterized in that, may further comprise the steps:
(1) pretrigger: judge whether the light probe circuit in the pretrigger module has low level signal output, if having, then signal is passed to power module, and power module begins whole tracing system is powered, and begins to start sun detection module degree simultaneously;
(2) sun location tracking: sun detection module passes to position control module with the position and the intensity of illumination information of the detected current sun, position control module is compared the positional information of these information and current solar panels, obtain making solar panels perpendicular to required mobile horizontal direction of sunray and the displacement information on the vertical direction, then this information is sent to driver module, driver module is adjusted with the direct current generator on the vertical both direction with the displacement information driving level on the vertical direction according to horizontal direction respectively, moves thereby drive exterior mechanical topworks; After treating that the mobile realization solar panels that finish are perpendicular to sunray, driver module is given position control module with the signal feedback that direct current generator stops to move, position control module passes to the maximum power point control module with this signal, is used to begin the tracking of maximum power point;
(3) MPPT maximum power point tracking: the maximum power point control module is after receiving that direct current generator that position control module sends stops movable signal, the MPPT maximum power point tracking module begins to control, the control method that adopts is the disturbance observation, be specially: by the circuit that has the MPPT function in the MPPT maximum power point tracking module is applied disturbance, change the duty of solar panel, Real Time Observation and calculate the size of solar panel output power then, result of calculation and last time point are compared, on this basis or keep or change control next step disturbance direction, thereby make the output of solar panel finally be stabilized near the maximum power point; After treating that output power is stable, maximum power point control module control solar panel is only externally exported electric energy at its maximum power point place;
(4) electric energy output: when the output of solar panel was stabilized near the maximum power point, the maximum power point control module passed in the energy storage device of outside by the electric energy of lead with conversion of solar energy.
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