CN106774611A - Multi-peak MPPT algorithm based on constant power curve method - Google Patents
Multi-peak MPPT algorithm based on constant power curve method Download PDFInfo
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Abstract
The invention discloses a kind of multi-peak MPPT algorithm based on constant power curve method, first using the step identical with common single peak MPPT track algorithms, any one LMPP is found, while recording corresponding three important parameters of the local maximum power pointP M1、U M1、I M1, now system defaultP max=P M1It is maximum power point；Scanned respectively from the characteristic opposite sides of I V and obtain each corresponding performance number of local peaking's pointP M2、P M3、P M4..., it is compared with the maximum power point in the first step successively, if nowP M2≥P M1, then nowP max=P M2, conversely, maximum power point does not change, it isP max=P M1, by that analogy, until it is determined that global maximum power point.Inventive algorithm operating efficiency is very high, and simple structure, power output substantially increase, and substantially increases Optimized System Design flow, has actual reference to the operation of photovoltaic system.
Description
Technical field
The present invention relates to a kind of multi-peak MPPT algorithm based on constant power curve method.
Background technology
In real work, the local shades that complex environment factor is produced generally cause the electricity of photovoltaic array to photovoltaic system
Stream-voltage (I-V) characteristic curve becomes into a ladder, and power vs. voltage (P-V) characteristic curve shows multi-peak.And it is traditional most
High-power point tracks (maximum power point tracking, MPPT) method]Such as climbing method, conductance increment method, disturbance
Observation etc., is generally all that the maximum power point in single peak curve is tracked, for multi-peak curve, due to cannot essence
Global maximum power point (global maximum power point, GMPP) really is traced into, system is absorbed in local extremum
And causing tracking to fail, the power output for ultimately resulting in photovoltaic array is significantly reduced.If any the Particle Swarm Optimization that document is proposed
Method is essentially a kind of whole scan method, but is difficult to realize for population and the selection of rational step-length, such as population
The too small or scanning step of scope selection is too big, can omit global maximum power point, if conversely, the selection of population scope it is too big or
Step-length is too small then to cause the reduction of whole system operational efficiency.Although have document propose a kind of PSO methods convergence rate quickly and
And global maximum power point can be accurately traced into, but the phenomenon shaken repeatedly occurs in actual motion, to solve the problem,
Generally need to increase specific hardware system to realize the stabilization output to power, it is clear that increase the numerous of cost and system
Polygamy.It is another have that document proposes when shade changes, the set-point of rapid increase photovoltaic array reference voltage comes again real
Now to the tracking of GMPP, the method has good improvement compared with traditional MPPT maximum power point tracking method.For multi-peak MPPT
The research of algorithm is always hot issue in recent years, has emerged many achievements in research to realize to multi-peak peak power
The tracking of point.
The content of the invention
It is an object of the invention to provide a kind of superiority with different shadow modes and feasibility based on etc.
The multi-peak MPPT algorithm of power curve method.
Technical solution of the invention is：
A kind of multi-peak MPPT algorithm based on constant power curve method, it is characterized in that：Comprise the following steps：
The first step:The step identical with common single peak MPPT track algorithms is used first, finds any one LMPP, together
The corresponding three important parameter P of the Shi Jilu local maximum power pointsM1、UM1、IM1, now system default Pmax=PM1It is maximum work
Rate point；
Second step：Scanned respectively from the opposite side of I-V characteristic curve and obtain each corresponding performance number of local peaking's point
PM2、PM3、PM4..., it is compared with the maximum power point in the first step successively, if now PM2≥PM1, then now Pmax=
PM2, conversely, maximum power point does not change, it is Pmax=PM1, by that analogy, until it is determined that global maximum power point.
The described multi-peak MPPT algorithm based on constant power curve method, concretely comprises the following steps：The first maximum work is drawn first
The power P of rate point " MPP1 "M1The power output value of constant power curve A, curve A lower lefts be respectively less than PM1, global maximum power
Point necessarily falls in the right regions of curve A；
The initial value of voltage is obtained into as small as possible, the initial value U of power taking pressure1=δ, short circuit current is slightly larger than operating current
I1, by Un+1=Pm/InAs the value of next operating point, wherein PmIt is power maximum, InIt is corresponding current value, Un+1For
The operating voltage of the (n+1)th step；By condition I3>I1And Un+1=Pm/InU can be obtained3>U2, PM1>P2, when voltage continues to increase, reach work
Make point " 3 ", now power P3=PM1, then proceed to increase voltage, new maximum power point " MPP2 " is found, while record is now
Power PM2, voltage UM2, electric current IM2；The maximum power value that will be searched twice compares, if now PM2≥PM1, then now
Maximum power point Pmax=PM2；Voltage continues to increase δ, until operating point " 4 ", still according to Un+1=Pm/InDetermine next one
Parameter power P at operating point5, voltage U5, electric current I5；Due to PM2≥P5, therefore voltage needs continuation increase, until operating point
" 6 ", now power P6=PM2, continue to increase voltage, find new maximum power point " MPP3 "；Adjacent local maximum power point it
Between at least differ a UMPP；UMPPRepresent the corresponding magnitude of voltage of photovoltaic module maximum power point in the present context；Make d=UMPP,
The condition that then the multi-peak MPPT algorithm terminates is U>UM1-d。
The present invention can realize the irrealizable multi-peak MPPT maximum power point tracking of traditional MPPT algorithm, can be directed to two peaks
Value and multi-peak power output curve carry out global MPP tracking, realize when photovoltaic array is blocked in local shades or illumination
When intensity changes, system can rapidly and accurately lock onto new maximum power point, and stabilization Maximum Power Output.
Inventive algorithm operating efficiency is very high, and its simple structure, power output substantially increase compared with traditional algorithm, checking
The validity of algorithm, substantially increases Optimized System Design flow, to the operation of photovoltaic system has actual reference.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is photovoltaic cell equivalent circuit diagram.
Fig. 2 is that component series and parallel model builds schematic diagram under the conditions of shadow occlusion.
Fig. 3 is the I-V curve schematic diagram under different illumination.
Fig. 4 is the P-V curve synoptic diagrams under different illumination.
Fig. 5 is any one branch structure figure in photovoltaic array.
Fig. 6 is photovoltaic array P-V output characteristic curve schematic diagrames.
Fig. 7 is photovoltaic array I-V output characteristic curve schematic diagrames.
Fig. 8, Fig. 9 are two kinds of output characteristic curve schematic diagrames of component sequence.
Figure 10 is the implementation process schematic diagram of constant power curved scanning method.
Figure 11 is the P-U-I three-dimensional output waveform diagrams of photovoltaic array.
Figure 12 is constant power curved line arithmetic flow chart.
Figure 13 is that bimodal system model builds schematic diagram.
Figure 14 is bimodal photovoltaic array P-V curve of output schematic diagrames.
Figure 15 is bimodal constant power algorithm power output-constant power curve tracing result schematic diagram.
Figure 16 is bimodal constant power algorithm power output-global maximum power point search process schematic diagram.
Figure 17 is three peak value model buildings schematic diagrames.
Figure 18 is three peak value PWM ripple generation module schematic diagrames.
Figure 19 is three peak value photovoltaic array output characteristics schematic diagrams.
Figure 20 is three peak value constant power algorithm power outputs-constant power curve tracing result schematic diagram.
Figure 21 is three peak value constant power algorithm power outputs-global maximum power point search process schematic diagram.
Specific embodiment
1 photovoltaic array is modeled
1.1 Mathematical Modelings
It is as shown in Figure 1 the equivalent circuit of photovoltaic cell, the pass of photovoltaic cell electric current and voltage is obtained according to Circuit theory
It is equation：
In formula, I0The reverse saturation current of diode；RSSeries resistance after equivalent；RpParallel resistance after equivalent；IphDeng
Effect photoelectric current；Q electric charge constants, it is q=1.602 × 10 to be worth-19C；The ideal factor of n diodes, meets (1≤n≤2)；T photovoltaics
The surface temperature of battery；K=1.381 × 10-23J/K Boltzmann constants；NsThe photovoltaic cell number of series connection.
V is photovoltaic array output voltage.
1.1.1 open-circuit condition
For open-circuit condition, under the test condition of standard, diode voltage now meets equation just：Vd=Vocn,
Temperature of the open-circuit voltage now also only with photovoltaic cell in itself is relevant, so as to obtain the open circuit electricity in the case of arbitrary temp
Pressure：
Voc：Voc=KV(T-Tref)+Vocn (2)
VocIt is open-circuit voltage；
KVIt is temperature proportional coefficient；
T is photovoltaic array temperature；
Tref=298.15 ℉, TrefReference temperature；
VocnIt is diode both end voltage value.
1.1.2 short-circuit condition
For short-circuit condition, in order to obtain the photoelectric current I under any intensity of illuminationph, need to will flow through the electric current of equivalent resistance
IpWith the electric current I of diodedOmit, now IphFor：
The actual intensities of illumination of S；
SrefWith reference to intensity of illumination；
IphIt is the photoelectric current under any intensity of illumination；
K1 is temperature proportional coefficient；
Tref=298.15 ℉, TrefReference temperature.
The actual intensities of illumination of S in formula；SrefWith reference to intensity of illumination；Tref=298.15 ℉, TrefReference temperature.
1.1.3 Diode Ideality Factor and reverse saturation current
For the ideal factor n of diode, n=1.4 is directly given herein.Influence I of the temperature to reverse saturation current0By
(4) formula is given：
Eg=1.12eV, is charge coefficient；
I0nThe diode reverse saturation current for nominally measuring；
N is the ideal factor of diode；
K is proportionality constant；
I0It is reverse saturation current；
T is photovoltaic array temperature；
Tref=298.15 ℉, TrefReference temperature.
In formula, Eg=1.12eV；I0nThe diode reverse saturation current for nominally measuring, is given by formula (5)：
I0nThe diode reverse saturation current for nominally measuring；
N is the ideal factor of diode；
VocnCorresponding maximum voltage when bearing reverse saturation current for diode；
IscnCorresponding maximum current when bearing reverse saturation current for diode；
K is proportionality constant；
Q electric charge constants, it is q=1.602 × 10 to be worth-19C；
Ns photovoltaic array numbers.
1.1.4 maximum power point
Peak power can be released by formula (1)：
PmaxIt is maximum power point；
VmIt is the corresponding voltage of maximum power point；
ImIt is the corresponding electric current of maximum power point；
N is the ideal factor of diode；
K is proportionality constant；
I0It is reverse saturation current；
T is photovoltaic array temperature；
IphIt is the photogenerated current being directly proportional to photovoltaic cell area, incident irradiance degree；
RSIt is photovoltaic module equivalent series resistance；
RPIt is photovoltaic module equivalent parallel resistance.
V in formulam、ImMaximum power point Pmax(maximum power point, MPP) corresponding voltage and current.By formula
(6) R is obtainedsWith RpBetween relation it is as follows：
RSIt is photovoltaic module equivalent series resistance；
RPIt is photovoltaic module equivalent parallel resistance；
VmnThe corresponding voltage of maximum power point；
PmaxnPeak power；
NsThe photovoltaic cell number of series connection.
I0nThe diode reverse saturation current for nominally measuring；
N is the ideal factor of diode；
K is proportionality constant；
Tref=298.15 ℉, TrefReference temperature；
Q electric charge constants, it is q=1.602 × 10 to be worth-19C；
IscnCorresponding maximum current when bearing reverse saturation current for diode.
It is easy to get by (7) formula, each RsAll there is a RpCorrespond, and only one group resistor satisfied Pmax=
Pmaxn, illustrating the maximum power point of built model will match with actual given photovoltaic cell, and should in Practical Project
In, do not exist for different this relations of photovoltaic cell, its parameter depends on manufacture craft and condition.
1.1.5 model buildings
The photovoltaic cell for being provided using ReneSola sunlight (ReneSola) herein, design parameter such as table 1 is given, and Fig. 2 is
The photovoltaic array simulation model built under the conditions of shadow occlusion.
Illumination condition is 200W/m in Fig. 3, Fig. 42、400W/m2、600W/m2、800W/m2、1000W/m2When I-V, P-V
Characteristic curve is exported.
The photovoltaic cell parameter of table 1
The analysis of output characteristics under 2 shadowed conditions
The test condition that producer gives is usually environmental factor (S=1000W/m nominally2, T=25 DEG C), tool
Body parameter is as shown in table 1.Fig. 5 is any one structure chart of branch road of photovoltaic array, wherein M1、M2、M3~MnIt is composed in series one
Branch road, the D of branch road upper endbBlocking diode, the D when branch road output voltage is too low, electric current flows backwardsbPlay protection component
Effect.D1~DnBypass diode, for avoiding damage of the hot spot effect to photovoltaic module.
Can be obtained by I-V output characteristics：When the component in any one series arm is influenceed by local shades, will
Cause the short circuit current I of the componentscReduce, now, when loading smaller, each component all meets normal condition of work, right
Outer power output, bypass diode does not have electric current to pass through；But when loading larger, if I>ISC1, while I<ISC2, I<
ISC3... I<ISCn, then M occurs1Power output, does not consume power on the contrary, equivalent to a load, now, bypass diode
D1Back-pressure is born, is played a protective role, U1<0, Id1>0, P1=U1I1<0；When load continues to increase, more components just occur not
Energy normal work, and consume more power.
The photovoltaic array first to { 5 × 5 } is studied herein, has L1、L2、L3、L4、L55 branch roads, every branch road
Structure is as shown in figure 5, the corresponding intensity of illumination of each component and maximum power point are as shown in table 2
Intensity of illumination and MPP when the branch case of table 2 is 5
As shown in Figure 6, Figure 7, photovoltaic module is under the conditions of local shades for simulation data I-V, P-V characteristic curve of the array
P-V is multi-peak, and I-V is stepped.It is easy to get by power output curve, when electric current is smaller, the output voltage of branch road is very big, this
When each branch road have power output；When electric current is larger, the output voltage very little of branch road, now some branch roads not output work
Rate, but consumption power.
Because branch road is under different shades, the P-V characteristic curves of output are different, and corresponding MPP is also different, although many
Voltage is identical after bar branch circuit parallel connection, but it cannot be guaranteed that every branch road is just while be operated on maximum power point, traditional MPPT
Algorithm is that overall output is tracked, and have ignored the power attenuation caused during branch circuit parallel connection.
Further to study the output characteristics under local shades, the photovoltaic array for using herein is by 10 × 100 module strings
Compose in parallel, every the branch road n=10, parallel branch m=100 of series connection.According to the difference of illumination, PV arrays are divided into 5 groups
Group (G1~G5), choose a component respectively from 5 groups and be analyzed, photovoltaic array light conditions：1. when unobstructed：S=
1000W/m2, when 2. blocking：S=600W/m2.Table 3 is the parametric scheme table of component, wherein N1Represent the group under standard illumination
Number, N2The group number under shadow occlusion is represented, simulation parameter is still from the battery parameter in table 1, simulation result such as Fig. 8, Fig. 9 institute
Show.
The component sequence shadow occlusion scheme table of table 3
For the parameter in table 3, simulation curve a, b, c, d, e in Fig. 8,9 correspond respectively to the group in photovoltaic array
G1~G5, show that photovoltaic module is identical with short circuit current in open-circuit voltage under different light intensity by simulation result.Although intensity of illumination
Open-circuit voltage, short circuit current on single photovoltaic module do not influence, but when the component for having varying number in photovoltaic module is subject to
When local shades influence, electric current of different sizes can be produced, bypass diode D nownCan be in different time conducting, this is also
Form two peak values in two in I-V curve move forward on one's knees platform and P-V curves.For the photovoltaic electric that wall scroll branch road is connected
Pond number is 10, works as N2<During a × n (a=0.6), the component of shadow-free blocked area is in maximum power point；Work as N2=a × n,
Blocked area is almost consistent with the peak power that unshielding area exports；Work as N2>A × n, shadow occlusion area is in maximum power point；With
The increase of shadow region, the power of whole component loss also increases, and above analysis can be obtained：For MPP under the conditions of local shades
Judgement, be first depending on the position that the pattern of blocking substantially determines MPP, be then controlled with Conventional monomodal value MPPT algorithm,
So as to solve the problems, such as power maximum to be mistaken for global maximum.
3 multi-peak MPPT
For problem set forth above, domestic and foreign scholars propose various solutions, and wherein scanning method is to apply to compare
A kind of extensive algorithm, the method is that the output characteristic curve of whole photovoltaic array is scanned, until finding GMPP.Due to
Needs are continual to be scanned to non-peak power region, and so as to cause system running speed to decline, power attenuation increases.This
Text is based on the basis of existing multi-peak MPPT algorithm research, it is proposed that a kind of improved overall situation is swept survey method-constant power curve and swept
Retouch method.
The 3.1 multi-peak MPPT algorithms based on constant power curve method
3.1.1 the principle of constant power curve method
The thought of constant power curve method comes from the analysis to several conventional whole scan methods, and the thought mainly includes following two
Step：
The first step:The step identical with common single peak MPPT track algorithms is used first, finds any one LMPP, together
The corresponding three important parameter (P of the Shi Jilu local maximum power pointsM1, UM1, IM1), now system default Pmax=PM1It is maximum
Power points.
Second step：Scanned respectively from the opposite side of I-V characteristic curve and obtain each corresponding performance number of local peaking's point
PM2、PM3、PM4..., it is compared with the maximum power point in the first step successively, if now PM2≥PM1, then now Pmax=
PM2, conversely, maximum power point does not change, it is Pmax=PM1, by that analogy, until it is determined that global maximum power point.
Although power scan method can accurately find GMPP, inevitable search of constantly being sampled at non-MPP points is reduced
The speed of service of whole system.In order to reduce the sampling time at non-maximum power point, it is proposed that the think of of constant power curve method
Think.As shown in Figure 10, P is drawn firstM1Constant power curve A, it is clear that the power output value of curve A lower lefts is respectively less than PM1,
Global maximum power point necessarily falls in the right regions of curve A.The initial value of voltage in second step is obtained as small as possible, no
Harm takes U1=δ, short circuit current is slightly larger than operating current I1, by Un+1=Pm/InAs the value of next operating point, wherein PmFor
Power maximum, InIt is corresponding current value, Un+1It is the operating voltage of the (n+1)th step.By condition I3>I1And Un+1=Pm/InCan obtain
U3>U2, PM1>P2, when voltage continues to increase, reach " 3 ", now P3=PM1, then proceed to increase voltage, find new maximum work
Rate point " MPP2 ", while record (P nowM2, UM2, IM2).The maximum power value that will be searched twice compares, if now PM2
≥PM1, then maximum power point P nowmax=PM2.Voltage continues to increase δ, until " 4 ", still according to Un+1=Pm/InDetermine work
Make the parameter (P at point " 5 " place5, U5, I5).Due to PM2≥P5, therefore voltage needs to continue to increase, until " 6 ", now P6=PM2,
Continue to increase voltage, find new maximum power point " MPP3 ".At least phase is obtained between adjacent local maximum power point by Figure 10
Differ from a UMPP(UMPPRepresent the corresponding magnitude of voltage of photovoltaic module maximum power point in the present context), make d=UMPP, then this is more
The condition that peak value MPPT algorithm terminates is U>UM1-d。
Still by taking sunlight brightness sunlight RSL150W photovoltaic cells as an example, setting illumination range S=200~1000W/m2, T=25 DEG C,
Photovoltaic array is 2 × 5.If Figure 11 is P-U-I three-dimensional curves of output, 5 voltage ranges of monoblock battery of series connection are 71~108V,
The then U of monoblock batteryMPPFluctuation range be 14.2~21.6V, therefore the value of d is 14V.
3.1.2 constant power curved line arithmetic flow chart
Figure 12 implements step for constant power curve method in whole scan method, and comprising MPPT maximum power point tracking two
Individual major part：①：First with side voltage of opening a way as starting point searches first maximum power point MPP1 and records preservation；
②：Search is scanned successively from short circuit current side, each local peaking's point is recorded, and is then compared to each other, it is final to determine the overall situation most
High-power point.3.1.3 model buildings and simulation analysis
According to above-mentioned theory analysis and control algolithm block diagram, built under Simulink environment first with Matlab softwares
As shown in figure 13, the parameter of photovoltaic array is respectively set to bimodal simulation model in 2 × 1 photovoltaic array：UOC=
175.9V、Um=143.6V, ISC=4.75A, Im=4.25A.Parameter setting：PV1 photovoltaic array intensities of illumination S=1000W/m2；
The part photovoltaic module of PV2 is blocked in 0.5s, by S=1000W/m2Sport S=600W/m2., as shown in figure 14, light
Photovoltaic array P-V characteristic curves are changed into curve II from curve I, and the maximum power point of photovoltaic array is changed into PM2 from PM1, if maximum work
The tracking process of rate point is provided without global search mode, then search process is likely to sink into local peaking's point, causes power loss,
Employ the simulation result of GMPPT algorithms as shown in Figure 15,16.
Figure 15 searches first part when can be seen that constant power curved scanning method 0.53s on the left of open-circuit voltage
After peak point, continue to scan on, second peak point has been searched in 0.6s, both are compared, and determine global maximum power
Point, finally stablizes output, also can intuitively be found out by Figure 16 maximum power outputs curve, and first local peaking's point is searched first
(PM2：After 325W), continue to search for, have found second local peaking point (PM1：375W), after both compare, it is determined that the overall situation is most
High-power point is (PM1：375W), the stabilization Maximum Power Output (U after 0.7sMPP=136.4V, PMPP=375W) demonstrate this
The stability and validity of control algolithm.
In order to further verify the superiority of the algorithm, the system model that power output is three peak values is built, such as Figure 17 institutes
Show, the parameter of photovoltaic array is respectively set in 3 × 1 photovoltaic array：UOC=211.6V, Um=157.5V, ISC=
4.75A、Im=4.25A.
In 0.3s, the part photovoltaic array of PV2 is blocked, intensity of illumination is by S=1000W/m2Sport S=
600W/m2；In 0.4s, the part photovoltaic array of PV3 is blocked, intensity of illumination is by S=1000W/m2Sport S=
400W/m2, Figure 18 is PWM ripple generation modules in three peak value peak power systems.
Figure 19 is photovoltaic array P-V characteristic curves.Due to the suddenly change of illumination, the peak power of photovoltaic array is by PM1
Become PM2.
Drawn by Figure 20, the whole scan method based on constant power curve in 0.5s, in the left side of open-circuit voltage for the first time
Searched local peaking's point, then continued to scan on, in 0.52s, searched second peak point, continue to scan on afterwards with
Track, in 0.64s, searches the 3rd peak point, and three is compared two-by-two, relatively draws global maximum power point afterwards,
Finally stablize output.By Figure 21 maximum power outputs curve also it is easy to see that first, system is after stabilization gradually to photovoltaic battle array
Row carry out MPPT maximum power point tracking, in the 0.06s after searching first local peaking's point, record peak value now
(PM3:104W), then proceed to search, in the 0.13s after searching second local peaking's point, record peak value now
Point (PM2:215W), both are compared, it is determined that now maximum power point is 215W, and record output, then continue to search for, and search
The 0.17s sought to after the 3rd local peaking's point records peak value (PM1 now:325W), by peak point now with protect before
The peak point deposited draws global maximum power point for 325W after being compared, and peak power value stabilization is exported after 0.7s,
Output result demonstrates the stability and validity of the control algolithm.
4 conclusions
The tracking that can cause maximum power point for traditional MPPT algorithm is absorbed in local maximum, it is impossible to farthest
Play the power output of photovoltaic array.This paper presents a kind of GMPPT control algolithms based on constant power curved scanning method.
1) I-V, P-V characteristic curve output being under different shadow occlusions to photovoltaic array first herein have carried out model
Build, the contact between intensity of illumination, shielding mode and array pattern is drawn by Output Characteristic, be multimodal maximum power point
Tracking establish good basis.
2) on the basis of photovoltaic array simulation model, a kind of constant power curve GMPPT algorithm models have been built, it is right respectively
Output is controlled under two peak values, three peak conditions.The sweep limits of the algorithm is whole piece characteristic curve, by comparing local peaks
It is worth the size of point, global maximum power point is finally determined, due to the introducing of the algorithm so that when system is operated in maximum power point
System can quickly skim over non-maximum power point when remotely.
3) algorithm can realize the irrealizable multi-peak MPPT maximum power point tracking of traditional MPPT algorithm, can be directed to two
Peak value and multi-peak power output curve carry out global MPP tracking, realize when photovoltaic array is blocked in local shades or light
When being changed according to intensity, system can rapidly and accurately lock onto new maximum power point, and stabilization Maximum Power Output.
The algorithm operating efficiency is very high, and its simple structure, power output substantially increase compared with traditional algorithm, demonstrates calculation
The validity of method, substantially increases Optimized System Design flow, has actual reference to the operation of photovoltaic system.
Claims (2)
1. a kind of multi-peak MPPT algorithm based on constant power curve method, it is characterized in that：Comprise the following steps：
The first step:The step identical with common single peak MPPT track algorithms is used first, any one LMPP is found, while note
Record corresponding three important parameters of the local maximum power pointP M1、U M1、I M1, now system defaultP max=P M1It is maximum power point；
Second step：Scanned respectively from the opposite side of I-V characteristic curve and obtain each corresponding performance number of local peaking's pointP M2、P M3、P M4..., it is compared with the maximum power point in the first step successively, if nowP M2≥P M1, then nowP max=P M2, instead
It, maximum power point does not change, and isP max=P M1, by that analogy, until it is determined that global maximum power point.
2. the multi-peak MPPT algorithm based on constant power curve method according to claim 1, it is characterized in that：Specific steps
For：The power of the first maximum power point " MPP1 " is drawn firstP M1Constant power curve A, curve A lower lefts power output value
Respectively less thanP M1, global maximum power point necessarily falls in the right regions of curve A；
The initial value of voltage is obtained into as small as possible, the initial value of power taking pressure, short circuit current is slightly larger than operating currentI 1, willU n+1=P m/I nAs the value of next operating point, whereinP mIt is power maximum,I nIt is corresponding current value,U n+1It is (n+1)th
The operating voltage of step；By conditionI 3>I 1AndU n+1=P m/I nCan obtainU 3>U 2,P M1>P 2, when voltage continues to increase, reach operating point
" 3 ", now powerP 3=P M1, then proceed to increase voltage, new maximum power point " MPP2 " is found, while record work(now
RateP M2, voltage UM2, electric currentI M2；The maximum power value that will be searched twice compares, if nowP M2≥P M1, then maximum now
Power pointsP max=P M2；Voltage continues to increase, until operating point " 4 ", still according toU n+1=P m/I nDetermine next one operating point
The parameter power at placeP 5, voltageU 5, electric currentI 5；Due toP M2≥P 5, therefore voltage needs continuation increase, until operating point " 6 ", this
When powerP 6=P M2, continue to increase voltage, find new maximum power point " MPP3 "；Between adjacent local maximum power point at least
Difference oneU MPP；U MPPRepresent the corresponding magnitude of voltage of photovoltaic module maximum power point in the present context；Orderd=U MPP, then this is more
Peak value MPPT algorithm terminate condition beU>U M1-d。
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