CN107732966A - Small-sized wind power generator MPPT optimal control methods based on dutycycle - Google Patents

Small-sized wind power generator MPPT optimal control methods based on dutycycle Download PDF

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Publication number
CN107732966A
CN107732966A CN201711076713.6A CN201711076713A CN107732966A CN 107732966 A CN107732966 A CN 107732966A CN 201711076713 A CN201711076713 A CN 201711076713A CN 107732966 A CN107732966 A CN 107732966A
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China
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dutycycle
work period
small
power generator
wind power
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CN107732966B (en
Inventor
胡海安
戴康
李富鹏
管宇翔
何艳明
薛陆清
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Suzhou Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
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Suzhou Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
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    • H02J3/386—
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/66—Regulating electric power
    • G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

Abstract

The present invention relates to a kind of small-sized wind power generator MPPT optimal control methods based on dutycycle, this method is primarily based on applied in the buck-boost converter being connected with small-sized wind power generator in each work period of small-sized wind power generatorP‑DSlope of a curve determines trace mode and tracking step-length, then is based onP‑DThe power output of slope of a curve and small-sized wind power generator determines the change direction of the pwm signal dutycycle of buck-boost converter, finally gives the dutycycle of the pwm signal of buck-boost converter in the subsequent work cycle, realizes MPPT maximum power point tracking control.The present invention realizes the high stability and high response speed of wind energy tracking, and work wind speed range is wide, can utilize wind energy to greatest extent, and carrying load ability is strong, can follow the trail of maximal wind-energy in wider wind speed range.

Description

Small-sized wind power generator MPPT optimal control methods based on dutycycle
Technical field
The invention belongs to new energy field, and in particular to the MPPT controlling parties used in a kind of small-size wind power-generating equipment Method.
Background technology
At present, 1~10KW small-sized wind power generator development speed is very fast, solves agriculture and animal husbandry without electric, few electricity, fisherman Basic living electrical problem.But the output of existing most of small-sized wind power generator is directly charged to battery, is made It is very low to obtain power coefficient, typically 0.3 or so.
Output voltage, electric current, the power of small-sized wind power generator are influenceed by the change of wind regime and load, in order to make full use of Small-sized wind power generator generates electricity, it is necessary to obtain small-sized wind power generator peak power in real time, improves the profit of small-sized wind power generator With efficiency, MPPT maximum power point tracking control is carried out to small-sized wind power generator.If fully utilize wind-driven generator maximum work Rate point tracing control can then improve annual electricity generating capacity 20%~30% or so.
Because wind speed has randomness and intermittence, not always run on rated wind speed, wind-driven generator is most It is in below rated wind speed and runs, it is therefore desirable to MPPT maximum power point tracking is kept in wider scope, so as to improve wind-force hair The utilization ratio of motor, obtain more energy.
Small-sized wind power generator maximum power tracing method is a lot, and different application processes is deposited during the use of reality In advantage and disadvantage, observational technique is disturbed based on dutycycle, it is not necessary to wind measuring device, it is not necessary to know the aerodynamic characteristics of wind wheel, Directly using dutycycle as control parameter, reduce the difficulty of controller design.
,, can when external load impedance and internal resistance of source impedance are into conjugation in linear circuit it can be seen from Circuit theory To obtain peak power output, in small time interval, whole system can be regarded as linear circuit, DC/DC conversion electricity It is exactly an impedance transformer that essence is played a part of on road in MPPT, plays a part of impedance conversion.Adjustment can be passed through The dutycycle D of pwm signal adjusts the input resistance of chopper, makes it equal to the change of wind-driven generator impedance, therefore DC/DC Translation circuit and load resistance can regard outside resistive load as, can realize equivalent negative by adjusting DC/DC converters Resistance is carried, and then realizes that generator input, output characteristics match with load impedance, makes generator operation in best operating point, from And wind energy conversion system rotating speed is controlled, realize maximum power output, system construction drawing is as shown in Figure 1.
Due to the randomness of wind speed and the uncertainty of some parameters, adjust big there is adjusting step during dutycycle D Small select permeability.If step-length is excessive, power output is in peak power output PmaxNearby fluctuation will increase point, cause power Loss, reduces wind energy conversion efficiency, and systematic steady state error becomes big；If step-length is too small, the tracking time will be elongated, influences system Dynamic responding speed.
Small-sized wind power generator MPPT controls are actually to reach optimum speed according to the change of wind speed come regulator generator, When the mechanical output inputted in small-sized wind power generator rotating shaft is more than the power output of generator, the rotating speed of generator will increase Add；Conversely, rotating speed can then decline.Therefore can be small by controlling the dutycycle can of DC/DC converter trigger pulses to adjust Power transmission relation between type wind-driven generator and load, so as to realize the rotating speed control to generator, i.e. increase triggering The dutycycle of pulse, the electrical power being transferred in load will increase, and the mechanical output of generator input is less than the electrical power of output, Rotating speed will be reduced；Conversely, reducing the dutycycle of trigger pulse, then the electrical power being transferred in load will also be reduced, generator The mechanical output of input is more than the electrical power of output, and rotating speed will raise.Therefore the duty of DC/DC converter pwm signals is controlled Than the electromotive power output of can control generator, and then control generator speed.
The DC/DC converters of traditional wind generator system using down-converter (Buck Chopper) or are adopted mostly With booster converter (Boost Chopper), when wind speed is relatively low, DC voltage is very low, is unfavorable for utilizing wind energy；When wind speed compared with Gao Shi, DC voltage is again very high, is unfavorable for decompression protection, so boosting or buck converter all causes wind-driven generator MPPT is operated in a narrower scope.
As can be seen here, working range to be present narrow, stably for MPPT control method used by existing small-sized wind power generator Property it is poor, tracking response speed it is slower the defects of.
The content of the invention
It is an object of the invention to provide a kind of preferable stability for realizing wind energy tracking and compared with high response speed, and can be The small-sized wind power generator MPPT optimal control methods based on dutycycle being tracked in wider wind speed range.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：
A kind of small-sized wind power generator MPPT optimal control methods based on dutycycle, for entering to small-sized wind power generator Row MPPT maximum power point tracking control, the small-sized wind power generator MPPT optimal control methods based on dutycycle be applied to it is small In the buck-boost converter that type wind-driven generator is connected, it is performed both by each work period of the small-sized wind power generator Following steps：
Step 1：K-th of work period institute output voltage U (k) of the small-sized wind power generator and electric current I (k) are carried out Sampling, then perform step 2；
Step 2：The voltage U (k) and electric current I that the small-sized wind power generator sampled according to k-th of work period exports (k) calculate the performance number P (k) of its k-th of work period, and further calculate the performance number P (k) of k-th of work period with Power offset value dP (k) between the performance number P (k-1) of -1 work period of kth；Calculate and risen described in k-th of work period The dutycycle D (k) of the pwm signal of buck converter and the pwm signal of buck-boost converter described in -1 work period of kth Duty cycle deviations value dD (k) between dutycycle D (k-1), then perform step 3；
Step 3：Obtained according to the power offset value dP (k) of k-th of work period and the duty cycle deviations value dD (k) To the sampled value of the P-D slopes of curve corresponding to k-th of work periodAnd after carrying out LPF to it and obtaining filtering Slope valueThen step 4 is performed；
Step 4：Compare the absolute value of the filtered slope valueWith zoom factor K, if Step 5 is then performed, ifThen perform step 6；
Step 5：It is determined that using fixed step size regulative mode, and determine that step value Δ D (k) is default step-length D, then perform step Rapid 7；
Step 6：It is determined that determining step value Δ D (k) using variable step regulative mode, and according to adjustment factor L, then perform Step 7；
Step 7：Compare the absolute value of the duty cycle deviations value | dD (k) | with default first positive-valued threshold ε1If | dD (k) | ＞ ε1, then step 8 is performed, if | dD (k) |≤ε1, then step 13 is performed；
Step 8：Judge filtered slope valueWhether 0 is equal to, if so, step 9 is then performed, if it is not, then performing Step 10；
Step 9：The dutycycle D (k) of the pwm signal of buck-boost converter is calculated according to k-th of work period To dutycycle D (k+1)=D (k) of the pwm signal of buck-boost converter described in+1 work period of kth, step is then performed 18；
Step 10：Judge filtered slope valueWhether 0 is more than, if so, step 11 is then performed, if it is not, then holding Row step 12；
Step 11：The dutycycle D (k) and step of the pwm signal of buck-boost converter according to k-th of work period 5 or step 6 in the step value Δ D (k) that determines, the PWM letters of buck-boost converter described in+1 work period of kth are calculated Number dutycycle D (k+1)=D (k)+Δ D (k), then perform step 18；
Step 12：The dutycycle D (k) and step of the pwm signal of buck-boost converter according to k-th of work period 5 or step 6 in the step value Δ D (k) that determines, the PWM letters of buck-boost converter described in+1 work period of kth are calculated Number dutycycle D (k+1)=D (k)-Δ D (k), then perform step 18；
Step 13：Compare the absolute value of the power offset value | dP (k) | with default second positive-valued threshold ε2If | dP (k)|≤ε2, then step 14 is performed, if | dP (k) | ＞ ε2, then step 15 is performed；
Step 14：The dutycycle D (k) of the pwm signal of buck-boost converter is calculated according to k-th of work period To dutycycle D (k+1)=D (k) of the pwm signal of buck-boost converter described in+1 work period of kth, step is then performed 18；
Step 15：Judge whether the power offset value dP (k) is more than the second positive-valued threshold ε2, if so, then performing step 16, if it is not, then performing step 17；
Step 16：The dutycycle D (k) and step of the pwm signal of buck-boost converter according to k-th of work period 5 or step 6 in the step value Δ D (k) that determines, the PWM letters of buck-boost converter described in+1 work period of kth are calculated Number dutycycle D (k+1)=D (k)+Δ D (k), then perform step 18；
Step 17：The dutycycle D (k) and step of the pwm signal of buck-boost converter according to k-th of work period 5 or step 6 in the step value Δ D (k) that determines, the PWM letters of buck-boost converter described in+1 work period of kth are calculated Number dutycycle D (k+1)=D (k)-Δ D (k), then perform step 18；
Step 18：By small-sized wind power generator output voltage U (k) described in k-th of work period and electric current I (k), described The dutycycle D (k) of the pwm signal of buck-boost converter, filtered slope valueAnd+1 work of the kth calculated The dutycycle D (k+1) for making the pwm signal of buck-boost converter described in the cycle carries out assignment for+1 work week of kth Phase, which calculates, to be used.
In the step 2, dP (k)=P (k)-P (k-1), dD (k)=D (k)-D (k-1).
In the step 3,Wherein, a is Filter factor,For filtered slope value in -1 work period of kth.
A ＜ ＜ 1.
In the step 4, the span of the zoom factor K is [0.9,1.1].
In the step 5, step-length D=D is presetmax, DmaxFor maximum tracing step.
In the step 5 or the step 6, Δ D (k)≤1.
In the step 6,
In the step 7, the first positive-valued threshold ε1Value is 0.01.
In the step 13, the second positive-valued threshold ε2Value is 0.01.
Because above-mentioned technical proposal is used, the present invention has following advantages compared with prior art：The present invention proposes one Small-sized wind power generator MPPT optimal control method of the kind based on dutycycle, realize the high stability of wind energy tracking and high response Speed, using buck-boost converter (Buck-Boost Chopper), voltage that it is exported can not only be higher than can also be less than or Equal to the DC voltage of input side, direct current voltage reulation scope is big, and work wind speed range is wide, can utilize wind energy to greatest extent, and band is born Loading capability is strong, can follow the trail of maximal wind-energy in wider wind speed range.
Brief description of the drawings
Accompanying drawing 1 is small-sized wind power generator MPPT system construction drawings.
Accompanying drawing 2 is power-duty cycle relationship figure.
Accompanying drawing 3 is the flow chart of the small-sized wind power generator MPPT optimal control methods based on dutycycle of the present invention.
Embodiment
The invention will be further described for shown embodiment below in conjunction with the accompanying drawings.
Embodiment one：A kind of small-sized wind power generator MPPT optimal control methods based on dutycycle, applied to it is small-sized In the DC/DC converters that wind-driven generator is connected, DC/DC converters use buck-boost converter (Buck-Boost here Chopper)。
The small-sized wind power generator MPPT optimal control methods based on dutycycle are：In each of small-sized wind power generator Following steps are performed both by work period：
Step 1：Using voltage sensor and current sensor to current k-th of work period institute of small-sized wind power generator Output voltage U (k) and electric current I (k) are sampled, and then perform step 2.
Step 2：The voltage U (k) and electric current I (k) that the small-sized wind power generator sampled according to k-th of work period exports are counted Performance number P (k)=U (k) × I (k) of its k-th of work period is calculated, is sent out according to the small wind that -1 work period of kth samples The voltage U (k-1) and electric current I (k-1) of motor output calculate performance number P (k-1)=U (k-1) of -1 work period of its kth × I (k-1), and further calculate the performance number P (k) of k-th of work period and the performance number P (k-1) of -1 work period of kth Between power offset value dP (k)=P (k)-P (k-1)；Calculate the pwm signal of buck-boost converter in k-th of work period Dutycycle in -1 work period of dutycycle D (k) and kth between the dutycycle D (k-1) of the pwm signal of buck-boost converter Deviation dD (k)=D (k)-D (k-1), here in k-th of work period the pwm signal of buck-boost converter dutycycle D (k) Obtained by -1 computation of Period of kth and assignment is stored for calling in a register, then perform step 3.
Step 3：The P- according to corresponding to power offset value dP (k) and duty cycle deviations value dD (k) obtain k-th of work period The sampled value of the D slopes of curveAnd to the sampled value of the P-D slopes of curveCarry out LPF and obtain To filtered slope valueWherein, a is filter factor, a ＜ ＜ 1,For filtered slope value in -1 work period of kth, can be filtered out because of sampling and environment using low pass filter Change and caused noise, sharp burr and ripple, then perform step 4.
Step 4：The absolute value of more filtered slope valueWith zoom factor K, zoom factor K value model Enclose for [0.9,1.1], typically take 1, so as to by the absolute value of the filtered P-D slopes of curveWith zoom factor K ratio Relatively result is as the trigger condition that variable step is transitioned into by fixed step size.By (the wind speed V3 of accompanying drawing 2>Wind speed V2>Wind speed V1) it can see Go out, the P-D slopes of curve change with the different of the distance from power maximum point, more remote apart from power maximum point, then after filtering The P-D slopes of curve absolute value it is bigger, nearer apart from power maximum point, then the absolute value of the filtered P-D slopes of curve is got over It is small.IfStep 5 is then performed, ifThen perform step 6.
Step 5：Due to the absolute value of the filtered P-D slopes of curveIt is larger, illustrate small-sized wind power generator compared with Away from maximum power point, therefore determine to use fixed step size regulative mode to obtain faster dynamic responding speed.Determine step value Δ D (k) it is default step-length D, usual D=Dmax, DmaxFor maximum tracing step, Δ D (k)≤1, step 7 is then performed.
Step 6：Due to the absolute value of the filtered P-D slopes of curveIt is smaller, illustrate that small-sized wind power generator exists Near maximum power point, therefore determine to use variable step regulative mode to obtain less steady-state error.Determined according to adjustment factor L Step valueAdjustment factor L typically takes the value in the range of [0.01,0.05], Δ D (k)≤1, then holds Row step 7.
Step 7：Compare the absolute value of duty cycle deviations value | dD (k) | with default less first positive-valued threshold ε1, the One positive-valued threshold ε1Value is 0.01, if | dD (k) | ＞ ε1, illustrate that small-sized wind power generator power output is possible to away from maximum It at power points, need to continue to judge in detail, then perform step 8, if | dD (k) |≤ε1, illustrate small-sized wind power generator power output It probably at maximum power point, need to continue to judge in detail, then perform step 13.
Step 8：| dD (k) | ＞ ε1When, judge filtered slope valueWhether 0 is equal to, if so, explanation Miniature wind Power generator power output then performs step 9 at maximum power point, if it is not, explanation small-sized wind power generator power output is remote At maximum power point, then step 10 is performed.
Step 9：It is 0 to illustrate the P-D slopes of curve, is traced at maximum power point, therefore according to k-th of work Buck-boost converter in+1 work period of kth is calculated in the dutycycle D (k) of the pwm signal of buck-boost converter in cycle Pwm signal dutycycle D (k+1)=D (k), without duty cycle adjustment, then perform step 18.
Step 10：WhenWhen, judge filtered slope valueWhether it is more than 0, P-D is judged with this The slope of curve it is positive and negative, if so, then perform step 11, if it is not, then perform step 12.
Step 11：Illustrate that the P-D slopes of curve are more than 0, small-sized wind power generator dutycycle lags behind maximum work Dutycycle at rate point, the dutycycle of small-sized wind power generator need to be improved to follow the trail of peak power, then according in k-th of work period The step value Δ D (k) determined in the dutycycle D (k) and step 5 or step 6 of the pwm signal of buck-boost converter, is calculated Dutycycle D (k+1)=D (the k)+Δ D (k) that should be used of the pwm signal of buck-boost converter, connects in+1 work period of kth Execution step 18.
Step 12：Illustrate that the P-D slopes of curve are less than 0, small-sized wind power generator dutycycle exceedes peak power Dutycycle at point, the dutycycle of small-sized wind power generator need to be reduced to follow the trail of peak power, then risen according in k-th of work period The step value Δ D (k) determined in the dutycycle D (k) and step 5 or step 6 of the pwm signal of buck converter, is calculated kth Dutycycle D (k+1)=D (the k)-Δ D (k) that should be used of the pwm signal of buck-boost converter, then holds in+1 work period Row step 18.
Step 13：|dD(k)|≤ε1When, compare the absolute value of power offset value | dP (k) | with default smaller second just Number threshold epsilon2, the second positive-valued threshold ε2Value is 0.01, if | dP (k) |≤ε2, illustrate that small-sized wind power generator power output is basic At maximum power point, then step 14 is performed, if | dP (k) | ＞ ε2, illustrate small-sized wind power generator power output away from maximum At power points, then step 15 is performed.
Step 14：Is calculated according to the dutycycle D (k) of the pwm signal of buck-boost converter in k-th of work period Dutycycle D (k+1)=D (k) that the pwm signal of buck-boost converter should use in k+1 work period, is adjusted without dutycycle Section, then perform step 18；
Step 15：Judge whether power offset value dP (k) is more than the second positive-valued threshold ε2, i.e., it is unchanged or faint in power The distance of present output power tracking maximum power point is judged during change, if so, step 16 is then performed, if it is not, then performing step 17；
Step 16：DP (k) ＞ ε2, illustrate that power is increasing, small wind hair when dutycycle is unchanged or faint change Motor dutycycle has fallen behind the dutycycle at maximum power point, need to increase the dutycycle of small-sized wind power generator to follow the trail of maximum work Rate, then determined according in the dutycycle D (k) of the pwm signal of buck-boost converter in k-th of work period and step 5 or step 6 Step value Δ D (k), the dutycycle D that the pwm signal of buck-boost converter in+1 work period of kth should use is calculated (k+1)=D (k)+Δ D (k), step 18 is then performed；
Step 17：DP (k) ＜-ε2When, illustrate that power is reducing, Miniature wind when dutycycle is unchanged or faint change Power generator dutycycle has exceeded the dutycycle at maximum power point, need to reduce the dutycycle of small-sized wind power generator to follow the trail of most It is high-power, according to true in the dutycycle D (k) of the pwm signal of buck-boost converter in k-th of work period and step 5 or step 6 Fixed step value Δ D (k), the dutycycle that the pwm signal of buck-boost converter in+1 work period of kth should use is calculated D (k+1)=D (k)-Δ D (k), then perform step 18；
Step 18：By the middle-size and small-size wind-driven generator output voltage U (k) of current operating cycle and electric current I (k), lifting buckling The dutycycle D (k) of the pwm signal of parallel operation, filtered slope valueAnd risen in+1 work period of the kth calculated The dutycycle D (k+1) of the pwm signal of buck converter carries out assignment and preserved in a register, so that the subsequent work cycle makes With the U (k-1) in register is entered as into k-th of work period U (k), I (k-1) is entered as into k-th of work period I (k) D (k-1), is entered as k-th of work period D (k), willIt is entered as k-th of work periodBy D (k)+1 work period D (k+1) of kth calculated is entered as, then U (k-1), I (k- are utilized in+1 work period of kth 1)、D(k-1)、D(k)、And U (k), the I (k) newly sampled is calculated.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention The equivalent change or modification that Spirit Essence is made, it should all be included within the scope of the present invention.

Claims (10)

  1. A kind of 1. small-sized wind power generator MPPT optimal control methods based on dutycycle, for being carried out to small-sized wind power generator MPPT maximum power point tracking controls, it is characterised in that：The small-sized wind power generator MPPT optimal control methods based on dutycycle Applied in the buck-boost converter being connected with small-sized wind power generator, in each work week of the small-sized wind power generator It is interim to be performed both by following steps：
    Step 1：K-th of work period institute output voltage U (k) of the small-sized wind power generator and electric current I (k) are adopted Sample, then perform step 2；
    Step 2：The voltage U (k) and electric current I (k) that the small-sized wind power generator sampled according to k-th of work period exports are counted The performance number P (k) of its k-th of work period is calculated, and further calculates the performance number P (k) and kth -1 of k-th of work period Power offset value dP (k) between the performance number P (k-1) of individual work period；Calculate and lift buckling described in k-th of work period The dutycycle D (k) of the pwm signal of parallel operation and the pwm signal of buck-boost converter described in -1 work period of kth dutycycle Duty cycle deviations value dD (k) between D (k-1), then perform step 3；
    Step 3：The is obtained according to the power offset value dP (k) of k-th of work period and the duty cycle deviations value dD (k) The sampled value of the P-D slopes of curve corresponding to k work periodAnd LPF is carried out to it and obtained filtered oblique Rate valueThen step 4 is performed；
    Step 4：Compare the absolute value of the filtered slope valueWith zoom factor K, ifThen hold OK
    Step 5, ifThen perform step 6；
    Step 5：It is determined that using fixed step size regulative mode, and determine that step value Δ D (k) is default step-length D, then perform step 7；
    Step 6：It is determined that determining step value Δ D (k) using variable step regulative mode, and according to adjustment factor L, step is then performed 7；
    Step 7：Compare the absolute value of the duty cycle deviations value | dD (k) | with default first positive-valued threshold ε1If | dD (k) | ＞ ε1, then step 8 is performed, if | dD (k) |≤ε1, then step 13 is performed；
    Step 8：Judge filtered slope valueWhether 0 is equal to, if so, step 9 is then performed, if it is not, then performing step 10；
    Step 9：Kth is calculated in the dutycycle D (k) of the pwm signal of buck-boost converter according to k-th of work period Dutycycle D (k+1)=D (k) of the pwm signal of buck-boost converter described in+1 work period, then perform step 18；
    Step 10：Judge filtered slope valueWhether 0 is more than, if so, step 11 is then performed, if it is not, then performing step Rapid 12；
    Step 11：The dutycycle D (k) of the pwm signal of buck-boost converter according to k-th of work period and step 5 or The step value Δ D (k) determined in step 6, the pwm signal of buck-boost converter described in+1 work period of kth is calculated Dutycycle D (k+1)=D (k)+Δ D (k), then perform step 18；
    Step 12：The dutycycle D (k) of the pwm signal of buck-boost converter according to k-th of work period and step 5 or The step value Δ D (k) determined in step 6, the pwm signal of buck-boost converter described in+1 work period of kth is calculated Dutycycle D (k+1)=D (k)-Δ D (k), then perform step 18；
    Step 13：Compare the absolute value of the power offset value | dP (k) | with default second positive-valued threshold ε2If | dP (k) |≤ ε2, then step 14 is performed, if | dP (k) | ＞ ε2, then step 15 is performed；
    Step 14：The dutycycle D (k) of the pwm signal of buck-boost converter according to k-th of work period is calculated Dutycycle D (k+1)=D (k) of the pwm signal of buck-boost converter described in k+1 work period, then perform step 18；
    Step 15：Judge whether the power offset value dP (k) is more than the second positive-valued threshold ε2, if so, step 16 is then performed, if It is no, then perform step 17；
    Step 16：The dutycycle D (k) of the pwm signal of buck-boost converter according to k-th of work period and step 5 or The step value Δ D (k) determined in step 6, the pwm signal of buck-boost converter described in+1 work period of kth is calculated Dutycycle D (k+1)=D (k)+Δ D (k), then perform step 18；
    Step 17：The dutycycle D (k) of the pwm signal of buck-boost converter according to k-th of work period and step 5 or The step value Δ D (k) determined in step 6, the pwm signal of buck-boost converter described in+1 work period of kth is calculated Dutycycle D (k+1)=D (k)-Δ D (k), then perform step 18；
    Step 18：By small-sized wind power generator output voltage U (k) described in k-th of work period and electric current I (k), the lifting The dutycycle D (k) of the pwm signal of buckling parallel operation, filtered slope valueAnd+1 work period of the kth calculated Described in the dutycycle D (k+1) of pwm signal of buck-boost converter carry out assignment so that the work period of kth+1 calculates Use.
  2. 2. the small-sized wind power generator MPPT optimal control methods according to claim 1 based on dutycycle, its feature exist In：In the step 2, dP (k)=P (k)-P (k-1), dD (k)=D (k)-D (k-1).
  3. 3. the small-sized wind power generator MPPT optimal control methods according to claim 1 based on dutycycle, its feature exist In：In the step 3,Wherein, a is filtering Coefficient,For filtered slope value in -1 work period of kth.
  4. 4. the small-sized wind power generator MPPT optimal control methods according to claim 3 based on dutycycle, its feature exist In：A ＜ ＜ 1.
  5. 5. the small-sized wind power generator MPPT optimal control methods according to claim 1 based on dutycycle, its feature exist In：In the step 4, the span of the zoom factor K is [0.9,1.1].
  6. 6. the small-sized wind power generator MPPT optimal control methods according to claim 1 based on dutycycle, its feature exist In：In the step 5, step-length D=D is presetmax, DmaxFor maximum tracing step.
  7. 7. the small-sized wind power generator MPPT optimal control methods according to claim 1 based on dutycycle, its feature exist In：In the step 5 or the step 6, Δ D (k)≤1.
  8. 8. the small-sized wind power generator MPPT optimal control methods according to claim 1 based on dutycycle, its feature exist In：In the step 6,
  9. 9. the small-sized wind power generator MPPT optimal control methods according to claim 1 based on dutycycle, its feature exist In：In the step 7, the first positive-valued threshold ε1Value is 0.01.
  10. 10. the small-sized wind power generator MPPT optimal control methods according to claim 1 based on dutycycle, its feature exist In：In the step 13, the second positive-valued threshold ε2Value is 0.01.
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