CN103199608A - Super-capacitor compensation method for improving photovoltaic module mismatch resistance capacity under short-time shadow - Google Patents
Super-capacitor compensation method for improving photovoltaic module mismatch resistance capacity under short-time shadow Download PDFInfo
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Abstract
The invention discloses a super-capacitor compensation method for improving photovoltaic module mismatch resistance capacity under short-time shadow. For a photovoltaic power generation system in actual working, photovoltaic cell units in series are divided into a plurality of cell modules, and each cell module is connected with a super capacitor in parallel to form one cell module with a mismatch compensation circuit. The optimal voltage working interval of the cell modules is U< (UL, UG), under the shadow condition G, continuing time that the cell modules are held within the optimal voltage working interval U<(UL, UG) is hold time T, and capacities of the super capacitors are compensation capacities C. According to the super-capacitor compensation method for improving the photovoltaic module mismatch resistance capacity under the short-time shadow, the confirmation method of the optimal working interval of the photovoltaic cell modules is provided, the standard (namely, the hold time) that the module voltage stability capacity is held by the super capacitors with the different capacities is provided, conception of choosing the super capacitor capacities is provided, and the method that under the certain shadow light intensity condition, a match relation among capacitance compensation capacities and the module hold time is obtained is provided.
Description
Technical field
The present invention relates to solar energy generation technology, relate in particular to a kind of raising super capacitor compensation method of the anti-mismatch capability of photovoltaic module under the shade in short-term.
Background technology
Along with industrial expansion, energy crisis and biological environment crisis force various countries to promote the fast development of regenerative resource energetically.Various countries have not only strengthened the supporting dynamics to the renewable energy technologies development, simultaneously also by corresponding rules and the powerful fast development that promotes regenerative resource market of policy.Therefore, the important component part solar energy power generating as regenerative resource has obtained using widely.
The design of any solar power system will consider that all shade covers problem.Shade can come between other building, trees or even the solar panel also may exist the shade that blocks mutually.Because building is more and distance is often very near in the city, thus in the city in the distributed photovoltaic system shadow problem particularly serious.Studies show that shade can not be underestimated the solar module Effect on Performance.In a photovoltaic module, even the little shade on a slice monocell also can have an immense impact on to the power output of whole assembly.This is because in photovoltaic module, and the batteries in parallel connection string requires each cell output voltage wherein identical, and the series-connected cell string requires the output current of each battery wherein identical.After certain battery was subjected to shade and blocks, obvious change will take place in its output characteristic.Less electric current and the voltage output of whole assembly that has been blocked battery limitation of this output just, thus cause gross output sharply to descend.The shade obstruction loss is because photovoltaic generating system is under the mismatch operational mode, and so-called mismatch operational mode refers to that the output characteristic curve of some photovoltaic cells in the photovoltaic module inconsistent working condition occurs owing to bearing light radiation intensity difference.
For the power mismatch phenomenon research of a lot of solutions has been arranged abroad, domestic in recent years also had a growing interest to this.The solution of existing research substantially all is based on utilizes diode that dissipation of energy passage and voltage compensation are provided, mainly contain the content of two aspects: 1, utilize bypass diode to provide the dissipation of energy passage for the module that influenced by shade, improve the branch current scope; 2, utilize blocking diode to provide voltage compensation to the branch road that influenced by shade, improve the array voltage scope.Yet these two kinds of methods can not be improved the problem that the module power output descends, and can cause the distortion of photovoltaic cell output characteristic curve simultaneously, and influence power supply stability also can cause traditional power tracking method to lose efficacy.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of raising super capacitor compensation method of the anti-mismatch capability of photovoltaic module under the shade in short-term, utilize super capacitor to carry out shunt compensation to the photovoltaic cell module under the mismatch operation, output characteristic when improving module and influenced by shade improves power output.
Technical scheme: for achieving the above object, the technical solution used in the present invention is:
Improve the super capacitor compensation method of the anti-mismatch capability of photovoltaic module under the shade in short-term, photovoltaic generating system to real work, the photovoltaic cell unit of series connection is divided into some battery modules, each battery modules super capacitor in parallel is formed the battery modules of a band mismatch compensation circuit; The optimum voltage operation interval of note battery modules is U ∈ (U
L, U
G), battery modules maintains optimum voltage operation interval U ∈ (U under shade condition G
L, U
G) in duration be the T that holds time, the super capacitor capacity in the T that holds time is compensation capacity C.
The optimum voltage operation interval is U ∈ (U
L, U
G) be generally near the slow regional voltage of the slope of power curve maximum power point, when voltage U is lower than U
LOr be higher than U
GAfter, power curve will occur with the variation of voltage U sharply descending.
Photovoltaic generating system often is subjected to local shade influence, the photovoltaic cell branch current of series connection and power descend, be in the mismatch running status, the duration of considering most of shade is shorter, therefore can adopt capacitor discharge to compensate the electric current of influenced part, improve photovoltaic cell branch current and the power output of series connection.Shunt capacitance can play the effect of voltage stabilizing, according to the calibration power/voltage curve under the photovoltaic cell different illumination intensity, the maximum power point voltage deviation of photovoltaic cell is little under the different light intensity, if photovoltaic cell is in maximum power point before the shade influence, influenced back is because the pressure stabilization function of electric capacity, will be near the maximum power point, compare the power output capacity that the present invention has greatly improved dash area with conventional method.
When influenced by shade, the shunt capacitance discharge can be arrived the current compensation of battery modules the size of current of the photovoltaic cell branch road of former series connection, thereby the photovoltaic cell branch current of series connection will can not be affected, but capacitance discharges will cause being subjected to the voltage of the battery modules that shade influences to descend, and the process that voltage descends is relevant with the intensity of illumination of the capacity of electric capacity and dash area.
Along with the suffered intensity of solar radiation of photovoltaic cell descends, maximum power point voltage is not constant, but in the decline process, be moved to the left, but it is less that the ratio of maximum power point and open circuit voltage changes, so can be similar in one section fixed proportion selecting open circuit voltage when determining that best effort is interval.Investigate Jia Sheng company, the typical solar cell panels data of Kyocera Buddhist monk moral company, Chang Yong solar panel maximum power point voltage is all at 0.8～0.84U as can be known
OcBetween, preferably set optimum voltage operation interval U ∈ (U
L, U
G) be U ∈ (0.8U
Oc, 0.84U
Oc), U wherein
OcOpen circuit voltage for battery modules;
Along with the increase of compensation capacity, holding time under certain shade light intensity also can be elongated, holds time from increase, improves the compensation ability to the shade situation, and compensation capacity is the bigger the better; But excessive compensation capacity will make the expense of erection unit increase, and influences the economy of photovoltaic generating system; In addition, compensation capacity is crossed conference and is caused electric capacity charging difficulty, and each photovoltaic system starts or all needs to replenish a large amount of electric weight to electric capacity when recovering from shade, causes system to start problems such as the serious and waste of energy of time-delay.So need in actual use to determine to install great compensation capacity, the tolerance degree to shade after installing can reach great level, namely determines compensation capacity and the matching relationship of holding time.
Specifically exist, under the situation of given shade condition G and building-out capacitor C, the T that holds time of i battery modules can determine by following method:
(a1) battery modules of band mismatch compensation circuit is carried out the modeling of mismatch compensation Mathematical Modeling, comprise the capacitive branch and the photovoltaic cell branch road that are in parallel, according to the electric capacity voltage-current characteristic, capacitive branch has:
As shown in Figure 1, wherein, I
CiDischarging current for capacitive branch; U
CiBe the shunt capacitance both end voltage; R
mDischarge resistance for capacitive branch; T is capacitor discharge time; U
iBe the voltage at capacitive branch two ends, also equal the voltage at photovoltaic cell branch road two ends;
The photovoltaic cell branch road has:
Wherein, I
iElectric current for the photovoltaic cell branch road; N
sNumber for the photovoltaic cell unit that comprises in the photovoltaic cell branch road; R
sBe the series resistance of photovoltaic cell unit in the photovoltaic cell branch road, can try to achieve by the voltage and current of bringing maximum power point into; I
0Be the temperature complexity coefficient, can try to achieve by open circuit voltage; I
PHBe photogenerated current, get I
PHEqual the short circuit current I of photovoltaic cell branch road
SC,
G is solar irradiation intensity, and STC represents the data under the standard test condition, is generally provided by producer;
The entire cell module has:
I=I
i+I
Ci （3）
The mismatch compensation Mathematical Modeling that formula (1) (2) (3) simultaneous obtains battery modules is one group of differential equation group;
(a2) under given shade condition G, building-out capacitor C is brought in the mismatch compensation Mathematical Modeling of battery modules, in the time interval of 5s, utilize runge kutta method that differential equation group is found the solution, obtain voltage array U and the electric current array I of each time point in the 5s, and time point is stored in the time point array t;
(a3) each element among the voltage array U is all deducted the lower limit U of optimum voltage operation interval
1And take absolute value, be stored in array U
TempIn;
(a4) at array U
TempIn seek minimum element, remember the m that is numbered of this element;
(a5) seeking reference numeral in time point array t is the element of m, the value t of this element
0Be under the given shade condition G, the T that holds time of corresponding building-out capacitor C, i.e. T=t
0
The matching relationship of shade condition G, building-out capacitor C and the T that holds time, it is the choice criteria of capacitance, can be by in the building-out capacitor C interval of setting, getting point continuously, asking for the T that holds time of each point, and in the shade condition G interval of setting, get point continuously, the method for asking for the T that holds time of each point determines, specifically comprise the steps:
(b1) get two battery modules that are in series, apply the standard illumination condition for respectively two battery modules, determine operating voltage and operating current, make two battery modules all work in photovoltaic cell branch road maximum power point place;
(b2) determine the optimum voltage operation interval U ∈ (U of two battery modules
L, U
G);
(b3) the building-out capacitor C of given two battery modules, the illumination condition of a battery modules is dropped to given shade condition G and certain time, utilize runge kutta method that the mismatch compensation Mathematical Modeling of this battery modules is found the solution, determine to reach this battery modules optimum voltage operation interval U ∈ (U
L, U
G) lower limit U
LTime, this time is the T that holds time;
(b4) change given shade condition G, keep building-out capacitor C constant, repeating step (b3) is determined the T that holds time, the point in getting sufficient shade condition interval;
(b5) keep given shade condition G constant, change building-out capacitor C, repeating step (b3) is determined the T that holds time, the point in getting sufficient building-out capacitor interval;
(b6) according to step (b3), (b4) and solving result (b5), obtain the matching relationship of shade condition G, building-out capacitor C and the T that holds time.
Beneficial effect: the raising provided by the invention super capacitor compensation method of the anti-mismatch capability of photovoltaic module under the shade in short-term, with respect to prior art, there is following advantage: 1) utilize the parallel diode circulating current, will cause shade module voltage to drop to the backward diode conducting voltage, this module will be in the consumed energy state this moment, make whole photovoltaic array power output occur declining to a great extent; After adopting the super capacitor compensation scheme, capacitor discharge offset current in the shade duration, the power of shade module will can not occur declining to a great extent, shadow effect shade module later will be charged to electric capacity, wait for that shade occurs next time, therefore compare this programme with diode compensation can holding power steady, prevents that power fluctuation occurs on a large scale; 2) parallel diode compensation scheme, when shade occurring, influenced module will occur significantly, and voltage descends, make total output characteristic serious distortion occur, the distortion of I-V characteristic, multi-peak and ladder appear in the P-V characteristic, influence power supply stability, may cause the load irregular working that connects, also be unfavorable for the tracking of maximum power point, utilize the super capacitor compensation scheme, can in the duration that shade occurs, keep the output voltage stabilization of shade module, improve output characteristic, guarantee the stability of power supply, also be convenient to control and power tracking; Some is provided the power that module improved when 3) shade influenced by capacitance discharges power, and the electric energy of this part need be replenished by electrical network or photovoltaic system after the shade influence finishes again; It is stable that but the effect of capacitance compensation is to keep voltage, and the shade module is continued to operate near the power output of maximum power point, and namely the power output capacity of shade module is greatly improved.
Description of drawings
Fig. 1 is equivalent circuit diagram of the present invention;
Fig. 2 for the present invention under shade influence, battery modules changing operate-point curve in 5s, wherein, the shade condition is: light intensity 0.5kw/m
2, building-out capacitor C is 10F;
Fig. 3 is under certain shade condition, and the matching relationship of building-out capacitor C and the T that holds time is found the solution flow chart;
Fig. 4 is building-out capacitor value between 0～55F, step-length 0.5F; The shade condition is at 0.3～0.8kw/m
2Between value, step-length 0.02kw/m
2, shade condition, the compensation capacity of trying to achieve by the method for the invention provides and hold time between this matching relationship curve.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further explanation.
Below in conjunction with accompanying drawing and an example the present invention is further specified.Set such example scenario, the SPG1786 type photovoltaic cell module 1 of capacitor compensation and battery modules 2 equal operate as normal are arranged at maximum power point under the standard testing situation, the building-out capacitor capacity C is 10F, and compensating circuit schematic diagram of the present invention as shown in Figure 1.T=0 battery modules 1 constantly is subjected to shade condition G influence, and intensity of illumination is by standard pyranometer 1000kw/m
2Drop to 500kw/m
2, battery modules 2 suffered intensities of illumination are constant.The following describes the method for asking of the T that holds time under this scene:
(a1) battery modules of band mismatch compensation circuit is carried out the modeling of mismatch compensation Mathematical Modeling, comprise the capacitive branch and the photovoltaic cell branch road that are in parallel, the parameter of used photovoltaic cell module can obtain by consulting manufacturer's correlation technique handbook.According to the electric capacity voltage-current characteristic,
Capacitive branch has:
As shown in Figure 1, wherein, I
CiDischarging current for capacitive branch; U
CiBe the shunt capacitance both end voltage; R
mDischarge resistance for capacitive branch; T is capacitor discharge time; U
iBe the voltage at capacitive branch two ends, also equal the voltage at photovoltaic cell branch road two ends;
The photovoltaic cell branch road has:
Wherein, I
1Electric current for the photovoltaic cell branch road; N
sFor the number of the photovoltaic cell unit that comprises in the photovoltaic cell branch road, for SPG1786 type solar cell module, N
s=48; R
sBe the series resistance of photovoltaic cell unit in the photovoltaic cell branch road, can try to achieve by the voltage and current of bringing maximum power point into; I
0Be the temperature complexity coefficient, can try to achieve by open circuit voltage; I
PHBe photogenerated current, get I
PHEqual the short circuit current I of photovoltaic cell branch road
SC,
G is solar irradiation intensity, and STC represents the data under the standard test condition, is generally provided by producer;
The entire cell module has:
I=I
1+I
C1 （3）
The mismatch compensation Mathematical Modeling that obtains battery modules is one group of differential equation group.
(a2) under given shade condition G, building-out capacitor C is brought in the mismatch compensation Mathematical Modeling of battery modules, in the time interval of 5s, utilize runge kutta method that differential equation group is found the solution, obtain voltage array U and the electric current array I of each time point in the 5s, and time point is stored in the time point array t.
Concrete solution procedure is: with equation group (1), (2) and (3) simultaneous, bring resistance capacitance and maximum power point data I=7.51A into, such one has four unknown number I
C1, U
C1, U
1And I
1, obtain one about I after the unit's arrangement that disappears
1One first-order ordinary differential equation:
The initial condition of equation (4) is: I
1(0)=7.51, t (0)=0.
The photovoltaic cell branch power is P
S=P
1+ P
2, because battery modules 2 is not influenced by shade, so its power output P
2Be decided to be very much maximum power 178.6W, battery modules 1 is subjected to shade influence, its output current moment drop to original general about, voltage begins slow decline.But because the compensating action of electric capacity, the unit in parallel output circuit of battery modules 2 there is no change, still is maximum power point electric current 7.51A, and the power output of this parallel connection unit is P
1=U
1* I
m, it is as shown in table 1 to utilize runge kutta method to find the solution the result that the differential equation (4) obtains:
Table 1 changing operate-point characteristic solving result (light intensity 0.5kw/m
2, building-out capacitor C is 10F)
Draw out voltage-current curve as shown in Figure 2 according to table 1, Fig. 2 has reflected the changing operate-point situation of solar cell voltage-current characteristic, and wherein solid line is shade module disturbances of power track in the 5s, and dotted line is the solar cell volt-ampere characteristic.Battery operated in maximum power point I under the etalon optical power irradiation
1=7.51A, U
1=23.8V, i.e. the point of M among Fig. 2 is when intensity of solar radiation drops to 0.5kw/m
2After, output current moment of solar cell drops to original about 50%, i.e. the point of A among Fig. 2, electric capacity begins discharge subsequently, entire cell module voltage descends gradually, and Working Points of Solar Battery will begin to move to the left along volt-ampere characteristic, moves to the B point by the A point in the 5s.
The power output that table 1 has reflected whole series connection photovoltaic cell branch road when capacitance compensation is arranged simultaneously is situation over time, and battery modules 1 intensity of illumination drops to 0.5kw/m
2After, the power output of branch road begins to be approximated to linear decline by maximum power 357.34W, drops to 343.27W behind 5s, has dropped to maximum power 93.7% place, therefore find out building-out capacitor can be in a period of time holding power constant.
(a3) each element among the voltage array U is all deducted the lower limit 0.8U of optimum voltage operation interval
OcAnd take absolute value, be stored in array U
TempIn;
(a4) at array U
TempIn seek minimum element, remember the m that is numbered of this element;
(a5) seeking reference numeral in time point array t is the element of m, the value t of this element
0Be under the given shade condition G, the T that holds time of corresponding building-out capacitor C, i.e. T=t
0=0.750s.
The super capacitor mismatch compensation need be paid close attention to the problem of following two aspects in the practical application: (1) need be at given time t for given shade condition G
0In module voltage maintained need the building-out capacitor C that installs in the best effort interval; (2) for given building-out capacitor C, suppose under the condition of shade condition G, module voltage is maintained in the best effort interval in can how long;
In order to answer top two problems, need to determine the matching relationship of shade condition G, building-out capacitor C and the T that holds time, namely how to select suitable electric capacity; Can be by in the building-out capacitor C interval of setting, getting point continuously, ask for the T that holds time of each point, and in the shade condition G interval of setting, get point continuously, the method for asking for the T that holds time of each point determines; Building-out capacitor is value between 0～55F, step-length 0.5F; The shade condition is at 0.3～0.8kw/m
2Between value, step-length 0.02kw/m
2, determine that the matching relationship step is as follows:
(b1) get two battery modules that are in series, apply the standard illumination condition for respectively two battery modules, determine operating voltage and operating current, make two battery modules all be in maximum power point;
(b2) determine the best effort scope of two battery modules, investigate Jia Sheng company, the typical solar cell panels data of Kyocera Buddhist monk moral company, Chang Yong solar panel maximum power point voltage is all at 0.8～0.84U as can be known
OcBetween, it is U ∈ (0.8U that the optimum voltage operation interval is set in this case
Oc, 0.84U
Oc);
(b3) the building-out capacitor C of given two battery modules drops to given shade condition G and certain time with the illumination condition of a battery modules, utilizes runge kutta method to find the solution, and determines to reach this battery modules optimum voltage operation interval U ∈ (U
L, U
G) lower limit U
LTime, this time is the T that holds time;
(b4) change given shade condition G, keep building-out capacitor C constant, repeating step (b3) is determined the T that holds time, the point in getting sufficient shade condition interval;
(b5) keep given shade condition G constant, change building-out capacitor C, repeating step (b3) is determined the T that holds time, the point in getting sufficient building-out capacitor interval;
((b6) obtains the matching relationship of shade condition G, building-out capacitor C and the T that holds time according to step (b3), (b4) and solving result (b5).The specific algorithm flow process is found the solution the result of matching relationship as shown in Figure 4 as shown in Figure 3.
The answer of foregoing problems be can obtain easily according to Fig. 4, for problem (1), at first in the shade light intensity, point (G, t found in the plane of holding time
0), make the vertical line perpendicular to this plane, with the surface intersection of Fig. 4 in a M, the projection of some M on the capacitance axle is designated as the compensation capacity C that should get; In like manner for problem (2), at first find point (C G), makes the vertical line on vertical line and this plane, with the surface intersection of Fig. 4 in a N, the projection of some N on the longitudinal axis is held time is designated as the time t that can maintain in the best effort interval
0.
The above only is preferred implementation of the present invention; be noted that for those skilled in the art; under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1. improve the super capacitor compensation method of the anti-mismatch capability of photovoltaic module under the shade in short-term, it is characterized in that: to the photovoltaic generating system of real work, the photovoltaic cell unit of series connection is divided into some battery modules, each battery modules super capacitor in parallel is formed the battery modules of a band mismatch compensation circuit; The optimum voltage operation interval of note battery modules is U ∈ (U
L, U
G), battery modules maintains optimum voltage operation interval U ∈ (U under shade condition G
L, U
G) in duration be the T that holds time, the super capacitor capacity in the T that holds time is compensation capacity C.
2. the raising according to claim 1 super capacitor compensation method of the anti-mismatch capability of photovoltaic module under the shade in short-term is characterized in that: described optimum voltage operation interval U ∈ (U
L, U
G) be U ∈ (0.8U
Oc, 0.84U
Oc), U wherein
OcOpen circuit voltage for battery modules.
3. the raising according to claim 1 super capacitor compensation method of the anti-mismatch capability of photovoltaic module under the shade in short-term, it is characterized in that: under the situation of given shade condition G and building-out capacitor C, the T that holds time of i battery modules determines by following method:
(a1) battery modules of band mismatch compensation circuit is carried out the modeling of mismatch compensation Mathematical Modeling, comprise the capacitive branch and the photovoltaic cell branch road that are in parallel, according to the electric capacity voltage-current characteristic, capacitive branch has:
Wherein, I
CiDischarging current for capacitive branch; U
CiBe the shunt capacitance both end voltage; R
mDischarge resistance for capacitive branch; T is capacitor discharge time; U
iBe the voltage at capacitive branch two ends, also equal the voltage at photovoltaic cell branch road two ends;
The photovoltaic cell branch road has:
Wherein, I
iElectric current for the photovoltaic cell branch road; N
sNumber for the photovoltaic cell unit that comprises in the photovoltaic cell branch road; R
sSeries resistance for photovoltaic cell unit in the photovoltaic cell branch road; I
0Be the temperature complexity coefficient; I
PHBe photogenerated current, get I
PHEqual the short circuit current I of photovoltaic cell branch road
SC,
G is solar irradiation intensity, and STC represents the data under the standard test condition;
The entire cell module has:
I=I
i+I
Ci （3）
The mismatch compensation Mathematical Modeling that formula (1) (2) (3) simultaneous obtains battery modules is one group of differential equation group;
(a2) under given shade condition G, building-out capacitor C is brought in the mismatch compensation Mathematical Modeling of battery modules, in the time interval of 5s, utilize runge kutta method that differential equation group is found the solution, obtain voltage array U and the electric current array I of each time point in the 5s, and time point is stored in the time point array t;
(a3) each element among the voltage array U is all deducted the lower limit U of optimum voltage operation interval
LAnd take absolute value, be stored in array U
TempIn;
(a4) at array U
TempIn seek minimum element, remember the m that is numbered of this element;
(a5) seeking reference numeral in time point array t is the element of m, the value t of this element
0Be under the given shade condition G, the T that holds time of corresponding building-out capacitor C, i.e. T=t
0
4. the raising according to claim 1 super capacitor compensation method of the anti-mismatch capability of photovoltaic module under the shade in short-term, it is characterized in that: the matching relationship of shade condition G, building-out capacitor C and the T that holds time, by in the building-out capacitor C interval of setting, getting point continuously, asking for the T that holds time of each point, and in the shade condition G interval of setting, get point continuously, the method for asking for the T that holds time of each point determines, specifically comprise the steps:
(b1) get two battery modules that are in series, apply the standard illumination condition for respectively two battery modules, determine operating voltage and operating current, make two battery modules all work in photovoltaic cell branch road maximum power point place;
(b2) determine the optimum voltage operation interval U ∈ (U of two battery modules
L, U
G);
(b3) the building-out capacitor C of given two battery modules, the illumination condition of a battery modules is dropped to given shade condition G and certain time, utilize runge kutta method that the mismatch compensation Mathematical Modeling of this battery modules is found the solution, determine to reach this battery modules optimum voltage operation interval U ∈ (U
L, U
G) lower limit U
LTime, this time is the T that holds time;
(b4) change given shade condition G, keep building-out capacitor C constant, repeating step (b3) is determined the T that holds time, the point in getting sufficient shade condition interval;
(b5) keep given shade condition G constant, change building-out capacitor C, repeating step (b3) is determined the T that holds time, the point in getting sufficient building-out capacitor interval;
(b6) according to step (b3), (b4) and solving result (b5), obtain the matching relationship of shade condition G, building-out capacitor C and the T that holds time.
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| CN104702206A (en) * | 2015-04-03 | 2015-06-10 | 浙江昱能科技有限公司 | Photovoltaic power generation system using bypass type direct current converters |
| CN108023543A (en) * | 2017-12-15 | 2018-05-11 | 苏州桑普泰克光能科技有限公司 | The photovoltaic string formation of pulse-type current output |
| CN108155870A (en) * | 2017-12-15 | 2018-06-12 | 苏州桑普泰克光能科技有限公司 | Electric current Self Matching photovoltaic string formation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104702206A (en) * | 2015-04-03 | 2015-06-10 | 浙江昱能科技有限公司 | Photovoltaic power generation system using bypass type direct current converters |
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| CN108155870A (en) * | 2017-12-15 | 2018-06-12 | 苏州桑普泰克光能科技有限公司 | Electric current Self Matching photovoltaic string formation |
| CN113328699A (en) * | 2021-02-01 | 2021-08-31 | 长沙理工大学 | 8-bit logic circuit for current coordination compensation of photovoltaic cell-super capacitor device series array and implementation method |
| CN113328699B (en) * | 2021-02-01 | 2022-07-05 | 长沙理工大学 | 8-bit logic circuit for coordinated compensation of series array current of photovoltaic cell-super capacitor device and implementation method |
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