CN103744466A - Photovoltaic array maximum power tracking method and device - Google Patents
Photovoltaic array maximum power tracking method and device Download PDFInfo
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Abstract
The invention relates to a photovoltaic array maximum power tracking method and device. The method includes the following steps that firstly, output voltages and output currents of a photovoltaic array are collected and the corresponding output power is obtained; secondly, according to the output power and the output voltages of two adjacent working points, the corresponding area ratio is obtained, and therefore the disturbance step length change amount is obtained; thirdly, the disturbance step length change amount and a preset PWM carrier signal are compared and a PWM control signal is produced; fourthly, according to the PWM control signal, the output voltages and the load power of the photovoltaic array are regulated in real time and maximum power tracking is finished. According to the features of a P-U output characteristic curve of the photovoltaic array, the disturbance step length change amount is changed through the area ratio, the maximum power of the photovoltaic array can be rapidly tracked and oscillating around tracking maximum power points is relieved.
Description
Technical field
The present invention relates to technical field of new energies, relate in particular to a kind of novel photovoltaic array maximum power tracking method and device.
Background technology
Along with the consumption of the energy, regenerative resource receives increasing concern.In numerous regenerative resources, luminous energy is pollution-free with it, the amount of containing is subject to greatly and more and more people's favor.But photovoltaic array output power changes with the change of external environment condition and load, generally utilization factor is not high, need to follow the tracks of to improve to its peak power the utilization factor of photovoltaic array.
The mode that existing employing closed-loop policy is realized photovoltaic array maximal power tracing is thanksed for your hospitality moving observation and conductance increment method.This class algorithm utilizes under the condition of normal illumination, and the output P-U family curve of photovoltaic cell is one and take the unimodal value function that maximum power point is extreme point, and at maximum power point, there is dP/dU=0 at place, by meeting dP/dU=0 from optimizing.But when external environment generation great change, or photovoltaic cell is during by partial occlusion, and said method may produce vibration or erroneous judgement, therefore can not well complete the tracking of peak power.
Therefore, need to propose a kind of new photovoltaic array maximal power tracing mode, to improve the utilization factor of photovoltaic array, accelerate to follow the tracks of the speed of maximum power of photovoltaic cell, reduce the oscillation of power in following the tracks of peak power point process, improve the utilization factor of sun power.
Summary of the invention
The object of the invention is to address the above problem, a kind of photovoltaic array maximum power tracking method and device are provided, the ratio of the triangle consisting of adjacent working point and coordinate axis and the area of rectangle carrys out deterministic disturbances step change amount, realize quick tracking photovoltaic array maximum power point and can reduce near oscillatory occurences tracking maximum power point, improve the utilization factor of photovoltaic array, reduce the cost of photovoltaic array power generation system.
For achieving the above object, the invention provides a kind of photovoltaic array maximum power tracking method, comprise the steps: that (1) gathers output voltage and the output current of photovoltaic array, obtains corresponding output power; (2) according to the output power of adjacent two working points and output voltage, obtain respective area ratio, and then obtain disturbance step change amount; (3) described disturbance step change amount is compared with preset PWM carrier signal, produce pwm control signal; (4) according to described pwm control signal, regulate in real time output voltage and the bearing power of photovoltaic array, complete maximal power tracing.
Step (2) further comprises: (21) obtain triangle area according to the difference of output power of gathered adjacent two working points and the difference of output voltage; (22) according to the output power of the first working point in the difference of the output voltage of gathered adjacent two working points and adjacent two working points, obtain rectangular area; (23) obtain the ratio of described triangle area and rectangular area, and then obtain disturbance step change amount.
Step (23) further comprises afterwards: (24) judge whether the output voltage of the second working point in adjacent two working points is less than the output voltage of maximum power point, if disturbance step change measure on the occasion of, otherwise disturbance step change measures negative value.
For achieving the above object, the present invention also provides a kind of photovoltaic array maximum power tracking device, comprising: sampling unit, CPU element, PWM processor and transformation of electrical energy circuit; Described sampling unit is connected with photovoltaic array and described CPU element respectively, for gathering output voltage and the output current of photovoltaic array, obtains corresponding output power; Described CPU element is connected with described PWM processor, for obtaining respective area ratio according to the output power of adjacent two working points and output voltage, and then obtains disturbance step change amount and transfers to described PWM processor; Described PWM processor is connected with described transformation of electrical energy circuit, for described disturbance step change amount is compared with preset PWM carrier signal, produces pwm control signal; Described transformation of electrical energy circuit is connected with load, for receiving described pwm control signal, regulates in real time output voltage and the bearing power of photovoltaic array, completes maximal power tracing.
Described CPU element further comprises triangle area acquisition module, rectangular area acquisition module and disturbance step change amount acquisition module; Described triangle area acquisition module is connected with described sampling unit, for obtaining triangle area according to the difference of output power of adjacent two working points of described sampling unit collection and the difference of output voltage; Described rectangular area acquisition module is connected with described sampling unit, for obtaining rectangular area according to the output power of the difference of the output voltage of adjacent two working points of described sampling unit collection and the first working point, adjacent two working point; Described disturbance step change amount acquisition module joins with described triangle area acquisition module and rectangular area acquisition module respectively, for obtaining the ratio of described triangle area and rectangular area, and then obtains disturbance step change amount.
Described CPU element further comprises the judge module being connected with described disturbance step change amount acquisition module, for judging whether the output voltage of the second working point, adjacent two working point is less than the output voltage of maximum power point, if disturbance step change measure on the occasion of, otherwise disturbance step change measures negative value.
Further, described transformation of electrical energy circuit adopts the Boost booster circuit being comprised of electric capacity, resistance, inductance, electronic power switch, described Boost booster circuit receives described pwm control signal, if pwm control signal is high level, and described electronic power switch conducting; If pwm control signal is low level, described electronic power switch disconnects, thereby regulates in real time output voltage and the bearing power of photovoltaic array, completes maximal power tracing.
The good effect of photovoltaic array maximum power tracking method provided by the invention and device is: the present invention, according to the feature of the P-U output characteristic curve of photovoltaic array, adopts the ratio of adjacent working point and the triangle of coordinate axis formation and the area of rectangle to change disturbance step change amount.With working point, the distance from maximum power point changes the ratio of area: from maximum power point away from time, the ratio of area is larger, disturbance step change amount is larger, can follow the tracks of fast maximum power point; From maximum power point close to time, the ratio of area is less, disturbance step change amount is less, with the disturbance of small step progress row, can reduce the vibration of power in power tracking process; Near maximum power point, the ratio of area is almost nil, and disturbance step change amount is zero substantially, substantially there is no vibration, thereby can fine photovoltaic array peak power be followed the tracks of at maximum power point.Even external environment sudden change, disturbance step change amount also changes rapidly and changes along with the ratio of area, thereby can reduce the misjudgment phenomenon at maximum power point.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of photovoltaic array maximum power tracking method of the present invention;
Fig. 2 is photovoltaic array P-U output characteristic curve schematic diagram of the present invention;
Fig. 3 is the configuration diagram of photovoltaic array maximum power tracking device of the present invention;
Fig. 4 is that one embodiment of the invention realize maximal power tracing process flow diagram;
Fig. 5 is system emulation circuit diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, photovoltaic array maximum power tracking method of the present invention and device are elaborated.
Referring to Fig. 1-2, wherein, Fig. 1 is the process flow diagram of photovoltaic array maximum power tracking method of the present invention, and Fig. 2 is photovoltaic array P-U output characteristic curve schematic diagram.Under the condition of normal illumination, the P-U output characteristic curve of photovoltaic array is a single peak curve, only has a maximum power point; Therefore can, by the output voltage of photovoltaic array is carried out to disturbance, by disturbance step-length, realize the tracking of photovoltaic array maximum power point.
Referring to Fig. 1, S110: gather output voltage U and the output current I of photovoltaic array, obtain corresponding output power P=U * I.
S120: obtain respective area ratio according to the output power of adjacent two working points and output voltage, and then obtain disturbance step change amount.
Be specifically as follows: according to the difference of output power of gathered adjacent two working points and the difference of output voltage, obtain triangle area; According to the output power of the first working point in the difference of the output voltage of gathered adjacent two working points and adjacent two working points, obtain rectangular area; Obtain the ratio of described triangle area and rectangular area, and then obtain disturbance step change amount.Further judge whether the output voltage of the second working point in adjacent two working points is less than the output voltage of maximum power point, if disturbance step change measure on the occasion of, otherwise disturbance step change measures negative value.
With reference to figure 2, establishing on photovoltaic array P-U output characteristic curve the coordinate of the first working point A in adjacent two working points is (U1, P1), and the coordinate of the second working point B is (U2, P2), and wherein U is photovoltaic array output voltage, and P is photovoltaic array output power.The line of point B and its projection D in the U of described P-U output characteristic curve coordinate axis is BD, the line of point A and its projection A ' in the P of described P-U output characteristic curve coordinate axis is A A ', the coordinate of the point of crossing C of the reverse extending line of BD and A A ' is (U2, P1); Line segment AB, AC, BC have formed a triangle ABC, its area S1=(U2-U1) * (P2-P1)/2.Point A projection E in the U of described P-U output characteristic curve coordinate axis; Line segment AC, AE, CD and DE have formed a rectangle ACDE, its area S2=(U2-U1) * P1.The value of the disturbance step change amount of the second working point B is △ D=K*S1/S2, and disturbance sensitivity K is constant coefficient (0<K<1), can obtain by experiment; And in figure the second working point B is on the maximum power point M left side, the second working point B and the first working point A output power difference are greater than zero, thus △ D get on the occasion of.
The ratio of S1 and S2 is relevant from the position of maximum power point M with working point: when working point from maximum power point M away from time, S1/S2 is larger, now disturbance step change amount △ D is larger, can follow the tracks of fast maximum power point; When working point from maximum power point M close to time, S1/S2 is less, now disturbance step change amount △ D is less, can reduce to follow the tracks of the vibration of power in peak power process; When near maximum power point M, S1/S2 is almost nil, and disturbance step change amount △ D is almost nil, thereby can realize the tracking of maximum power point, has substantially eliminated oscillatory occurences, has reduced power loss.Present operating point is in maximum power point M left side, and △ P=P2-P1>0, according to the ratio of S1/S2, obtains the △ D of corresponding size and forward; Present operating point is on maximum power point M right side, and △ P=P2-P1<0, according to the ratio of S1/S2, obtains the △ D of corresponding size and negative sense.
Continuation is with reference to figure 1, S130: described disturbance step change amount is compared with preset PWM carrier signal, produce pwm control signal.Pwm control signal changes with △ D.
S140: according to described pwm control signal, regulate in real time output voltage and the bearing power of photovoltaic array, complete maximal power tracing.
When working point from maximum power point M away from, disturbance step change amount △ D is larger, now by △ D and the comparison of PWM carrier signal, and the pwm control signal that output duty cycle is larger, the output voltage of photovoltaic array raises comparatively fast, and working point is to maximum power point M fast moving; When working point from maximum power point M close to, disturbance step change amount △ D is less, now by △ D and the comparison of PWM carrier signal, the pwm control signal that output duty cycle is less, the output voltage of photovoltaic array raises slower, slowly move to maximum power point M working point, can reduce to follow the tracks of the vibration of power in peak power process; Until complete the tracking of maximum power point.
Referring to Fig. 3, a kind of photovoltaic array maximum power tracking device, comprises sampling unit 31, CPU element 32, PWM processor 33 and transformation of electrical energy circuit 34.
Described sampling unit 31 is connected with photovoltaic array 30 and described CPU element 32 respectively, for gathering output voltage U and the output current I of photovoltaic array 30, obtains corresponding output power P=U * I.
Described CPU element 32 and described PWM(Pulse Width Modulation, pulse-length modulation) processor 33 is connected, for obtaining respective area ratio according to the output power of adjacent two working points and output voltage, and then obtain disturbance step change amount and transfer to described PWM processor 33.
Simultaneously with reference to figure 2, the adjacent two working point A that described CPU element 32 gathers according to described sampling unit 31, the difference of output power and the difference of output voltage of B, can obtain the area S1=(U2-U1 of triangle ABC) * (P2-P1)/2; According to the output power of the first working point A in the difference of the output voltage of gathered adjacent two working point A, B and adjacent two working points, can obtain rectangle ACDE area S2=(U2-U1) * P1; According to the ratio of described triangle area and rectangular area, and then the value of obtaining disturbance step change amount is △ D=K*S1/S2, and disturbance sensitivity K is constant coefficient (0<K<1).Further judge that in adjacent two working points, the second working point B(is also present operating point) output voltage whether be less than the output voltage of maximum power point M, if disturbance step change measure on the occasion of, otherwise disturbance step change measures negative value.
With reference to figure 2, Fig. 3, as preferred embodiment, described CPU element 32 further comprises triangle area acquisition module 321, rectangular area acquisition module 322 and disturbance step change amount acquisition module 323 simultaneously.
Described triangle area acquisition module 321 is connected with described sampling unit 31, for obtaining triangle area, S1=(U2-U1) * (P2-P1)/2 according to the difference of output power and the difference of output voltage of adjacent two working points of described sampling unit 31 collections.
Described rectangular area acquisition module 322 is connected with described sampling unit 31, for obtaining rectangular area, S2=(U2-U1) * P1 according to the difference of output voltage and the output power of the first working point, adjacent two working point of adjacent two working points of described sampling unit 31 collections.
Described disturbance step change amount acquisition module 323 joins with described triangle area acquisition module 321 and rectangular area acquisition module 322 respectively, for obtaining the ratio of described triangle area and rectangular area, and then obtain disturbance step change amount, △ D=K*S1/S2.
Described CPU element 32 further comprises the judge module 324 being connected with described disturbance step change amount acquisition module 323, for judging whether the output voltage of the second working point, adjacent two working point is less than the output voltage of maximum power point, if disturbance step change measure on the occasion of, otherwise disturbance step change measures negative value.
Described PWM processor 33 is connected with described transformation of electrical energy circuit 34, for described disturbance step change amount is compared with preset PWM carrier signal, produces pwm control signal.Wherein, the input message of described PWM processor 33 is the disturbance step change amount △ D=K* (S1/S2) that described CPU element 32 is obtained, △ D is converted to after the manageable data layout of PWM processor 33, the PWM carrier signal comparison preset with PWM processor 33, generation changes pwm control signal with △ D and exports described transformation of electrical energy circuit 34 to.
Described transformation of electrical energy circuit 34 is connected with load 39, for receiving described pwm control signal, regulates in real time output voltage and the bearing power of photovoltaic array 30, completes maximal power tracing.When working point from maximum power point M away from, disturbance step change amount △ D is larger, now by △ D and the comparison of PWM carrier signal, the pwm control signal that output duty cycle is larger, described transformation of electrical energy circuit 34 output voltages raise very fast, the output voltage of photovoltaic array 30 also raises rapidly, and working point is to maximum power point M fast moving; When disturbance step change amount △ D less, working point from maximum power point M close to, now by △ D and the comparison of PWM carrier signal, the pwm control signal that output duty cycle is less, described transformation of electrical energy circuit 34 output voltages raise slower, the output voltage of photovoltaic array 30 also slowly raises, and slowly move to maximum power point M working point, can reduce to follow the tracks of the vibration of power in peak power process; Until complete the tracking of maximum power point.
As preferred embodiment, described transformation of electrical energy circuit 34 adopts the Boost booster circuit being comprised of electric capacity, resistance, inductance, electronic power switch, described Boost booster circuit receives described pwm control signal, if pwm control signal is high level, and described electronic power switch conducting; When working point from maximum power point M away from, disturbance step change amount △ D is larger, now by △ D and the comparison of PWM carrier signal, the pwm control signal that output duty cycle is larger, pwm control signal dutycycle is larger, the time of electronic power switch conducting is longer, and working point is to maximum power point M fast moving; Pwm control signal dutycycle is less, and the time of electronic power switch conducting is shorter, and slowly move to maximum power point M working point.If pwm control signal is low level, described electronic power switch disconnects, thereby real-time regulation output voltage and bearing power complete maximal power tracing.
If the input voltage of described Boost booster circuit is Uin, electric current is Iin; Input equivalent resistance is Req.The output voltage of described Boost booster circuit is that U0, electric current are I0; Pull-up resistor is R0.Before and after transformation of electrical energy, energy loss is very little, can ignore, output voltage U 0=(1/(1-D)) * Uin; D is for driving the dutycycle of electronic power switch; U0* I0=Uin*Iin=Uin
2/ Req=U0
2/ R0, Req=Uin/Iin=(1-D)
2* R0.The output voltage disturbance of photovoltaic array is equivalent to the input voltage of Boost booster circuit to carry out disturbance, therefore by disturbance control inputs voltage, with this, control the PWM ripple of change in duty cycle, regulate in real time dutycycle D, input impedance is mated with loaded impedance, complete the tracking of maximum power point; Boost booster circuit plays the effect of boosted voltage on the other hand.
When pwm control signal is high level, electronic power switch conducting, its place branch road is equivalent to a wire, and the voltage of photovoltaic array output is to induction charging, and the voltage on electric capacity powers to the load.When pwm control signal is low level, electronic power switch place branch road disconnects, and inductance capacitance powers to the load jointly.According to the output power of photovoltaic array, regulate in real time the pwm control signal of the electronic power switch of input Boost booster circuit, by the break-make of electronic power switch, realize the adjusting of dutycycle D, and then realize the transmission of electric energy, the adjusting of the adjusting of output voltage, bearing power is assisted and realized maximal power tracing.
With reference to figure 4, one embodiment of the invention realizes maximal power tracing process flow diagram.Wherein, U, I are photovoltaic array output voltage and output current; P (K-1) is the output power of previous periodic light photovoltaic array, the output power that P (K) is current photovoltaic array; S1 is the area of triangle ABC, and S2 is the area of rectangle ACDE; D (K) is current disturbance step-length, the disturbance step-length that D (K+1) is next cycle, and △ Dt is a temporary variable; U (K) is current output voltage, the output voltage that Umax is maximum power point.As △ P=P (K)-P (K-1) >0, if U (K) is <Umax, present operating point is on the maximum power point left side, △ Dt=△ Dt, next disturbance step-length D(K+1)=D(K)+△ Dt, present operating point is close to maximum power point; If U (K) is >Umax, present operating point is at maximum power point the right, △ Dt=-△ Dt, next disturbance step-length D(K+1)=D(K)+△ Dt, present operating point is close to maximum power point.As △ P=P (K)-P (K-1) <0, if UK) <Umax, present operating point is on the maximum power point left side, △ Dt=△ Dt, next disturbance step-length D(K+1)=D(K)+△ Dt, present operating point is close to maximum power point; If U (K) is >Umax, present operating point is at maximum power point the right, △ Dt=-△ Dt, next disturbance step-length D(K+1)=D(K)+△ Dt, present operating point is close to maximum power point.The output power P of current photovoltaic array (K) assignment, to P (K-1), is proceeded to MPPT maximum power point tracking.
The present invention, according to the feature of the P-U output characteristic curve of photovoltaic array, adopts the ratio of adjacent working point and the triangle of coordinate axis formation and the area of rectangle to change disturbance step change amount.With working point, the distance from maximum power point changes the ratio of area, and disturbance step change amount is along with the change of the ratio of area and change; Working point from maximum power point away from time, the ratio of area is larger, disturbance step change amount is larger, now can follow the tracks of fast maximum power point; Working point is when nearer apart from maximum power point, and the ratio of area is less, and disturbance step change amount is less, with the disturbance of small step progress row, can reduce the vibration of power in power tracking process; Working point is near maximum power point, and the ratio of area is more almost nil, and disturbance step change amount is zero substantially, substantially there is no vibration, thereby can fine photovoltaic array peak power be followed the tracks of at maximum power point.Also, the self-adaptation of the triangle forming by adjacent working point and coordinate axis and the ratio of the area of rectangle realize disturbance step change amount from optimizing, the tracking of realization to photovoltaic array maximum power point fast.And when external environment is undergone mutation, the output characteristic curve of photovoltaic array can change accordingly; Now the ratio of area also can change thereupon, thereby traces into faster new maximum power point with new step-length.
Next in conjunction with system shown in Figure 5 artificial circuit figure, further illustrate photovoltaic array maximum power tracking device of the present invention.
The control section of module 54 photovoltaic array maximum power tracking device of the present invention, comprises Im & PI module and PWM module.Im & PI module gathers output voltage U 0 and the output current I0 of photovoltaic array, calculates output power P=U0* I0, the area S1=(U2-U1 of photovoltaic array) * (P2-P1)/2, S2=(U2-U1) * P1; Obtain disturbance step change amount △ D=K* (S1/S2); Im & PI module is positive and negative according to △ P=P2-P1's, produces △ D positive and negative, that vary in size.PWM module is input as △ D=K*S1/S2, △ D is by the built-in PWM carrier signal comparison of conversion and PWM module, generation changes pwm control signal with △ D, pwm control signal is directly controlled the electronic power switch of Boost booster circuit, completes the tracking of peak power by the break-make of real-time adjusting electronic power switch.
The transformation of electrical energy circuit part of module 55 photovoltaic array maximum power tracking device of the present invention, adopts the Boost booster circuit being comprised of capacitor C 1, inductance L 1, resistance R 1, electronic power switch Mosfet and diode D1, filter capacitor C0.When pwm control signal is high level, electronic power switch Mosfet conducting, place branch road is equivalent to a wire, and the voltage of photovoltaic array output is to inductance L 1 charging, and the voltage in capacitor C 1 powers to the load.When pwm control signal is low level, electronic power switch Mosfet place branch road disconnects, and L1, C1 power to the load jointly.Break-make by electronic power switch realizes the transmission of electric energy, the adjusting of the adjusting of output voltage, bearing power.Module 55 also comprises CCCS CCS, and the electric current of photovoltaic array flows into from the positive pole of CCS, from the negative pole of CCS, flows out, and forms a loop; Also be the effect that CCS plays shunting.
Module 561-564 is respectively voltage table VM1, VM2, and reometer CM1, CM2 measure respectively and export voltage, the electric current of place branch road.Module 57 is output unit, is mainly used in Output simulation result, and whether checking simulation result is correct.Module 58 is Clock To Workplace module, for display system input time.
By emulation, can find out, from maximum power point away from time, the ratio of the triangle that adjacent working point and coordinate axis form and the area of rectangle is larger, disturbance step change amount is larger, now can follow the tracks of fast maximum power point; When nearer apart from maximum power point, the ratio of area is less, and disturbance step change amount is less, with the disturbance of small step progress row, can reduce the vibration of power in power tracking process; Near maximum power point, the ratio of area is more almost nil, and disturbance step change amount is zero substantially, substantially there is no vibration, thereby can fine photovoltaic array peak power be followed the tracks of at maximum power point.
The above is only the preferred embodiments of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of structure of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. a photovoltaic array maximum power tracking method, is characterized in that, comprises the steps:
(1) gather output voltage and the output current of photovoltaic array, obtain corresponding output power;
(2) according to the output power of adjacent two working points and output voltage, obtain respective area ratio, and then obtain disturbance step change amount;
(3) described disturbance step change amount is compared with preset PWM carrier signal, produce pwm control signal;
(4) according to described pwm control signal, regulate in real time output voltage and the bearing power of photovoltaic array, complete maximal power tracing.
2. photovoltaic array maximum power tracking method as claimed in claim 1, is characterized in that, step (2) further comprises:
(21) according to the difference of output power of gathered adjacent two working points and the difference of output voltage, obtain triangle area;
(22) according to the output power of the first working point in the difference of the output voltage of gathered adjacent two working points and adjacent two working points, obtain rectangular area;
(23) obtain the ratio of described triangle area and rectangular area, and then obtain disturbance step change amount.
3. photovoltaic array maximum power tracking method as claimed in claim 2, is characterized in that, step (23) further comprises afterwards:
(24) judge whether the output voltage of the second working point in adjacent two working points is less than the output voltage of maximum power point, if disturbance step change measure on the occasion of, otherwise disturbance step change measures negative value.
4. a photovoltaic array maximum power tracking device, is characterized in that, comprising: sampling unit, CPU element, PWM processor and transformation of electrical energy circuit;
Described sampling unit is connected with photovoltaic array and described CPU element respectively, for gathering output voltage and the output current of photovoltaic array, obtains corresponding output power;
Described CPU element is connected with described PWM processor, for obtaining respective area ratio according to the output power of adjacent two working points and output voltage, and then obtains disturbance step change amount and transfers to described PWM processor;
Described PWM processor is connected with described transformation of electrical energy circuit, for described disturbance step change amount is compared with preset PWM carrier signal, produces pwm control signal;
Described transformation of electrical energy circuit is connected with load, for receiving described pwm control signal, regulates in real time output voltage and the bearing power of photovoltaic array, completes maximal power tracing.
5. photovoltaic array maximum power tracking device as claimed in claim 4, is characterized in that, described CPU element further comprises triangle area acquisition module, rectangular area acquisition module and disturbance step change amount acquisition module; Described triangle area acquisition module is connected with described sampling unit, for obtaining triangle area according to the difference of output power of adjacent two working points of described sampling unit collection and the difference of output voltage; Described rectangular area acquisition module is connected with described sampling unit, for obtaining rectangular area according to the output power of the difference of the output voltage of adjacent two working points of described sampling unit collection and the first working point, adjacent two working point; Described disturbance step change amount acquisition module joins with described triangle area acquisition module and rectangular area acquisition module respectively, for obtaining the ratio of described triangle area and rectangular area, and then obtains disturbance step change amount.
6. photovoltaic array maximum power tracking device as claimed in claim 5, it is characterized in that, described CPU element further comprises the judge module being connected with described disturbance step change amount acquisition module, for judging whether the output voltage of the second working point, adjacent two working point is less than the output voltage of maximum power point, if disturbance step change measure on the occasion of, otherwise disturbance step change measures negative value.
7. photovoltaic array maximum power tracking device as claimed in claim 4, it is characterized in that, described transformation of electrical energy circuit adopts the Boost booster circuit being comprised of electric capacity, resistance, inductance, electronic power switch, described Boost booster circuit receives described pwm control signal, if pwm control signal is high level, described electronic power switch conducting; If pwm control signal is low level, described electronic power switch disconnects, thereby regulates in real time output voltage and the bearing power of photovoltaic array, completes maximal power tracing.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104898758A (en) * | 2015-04-10 | 2015-09-09 | 上海电机学院 | Photovoltaic array maximum power tracing apparatus and method |
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