CN102242689B - Maximum power point (MPP) tracked and controlled improved mountain climbing algorithm based on wind power generation - Google Patents

Abstract

The invention provides an improved mountain climbing algorithm with a disturbance stop mechanism, aiming at the problem of erroneous judgement of a searching direction resulted from rotation speed oscillation and wind speed change existing in a mountain climbing algorithm at an MPP. The algorithm not only inherits an advantage of a variable step length mountain climbing method for rapidly searching to neighbourhoods of the MPP but also has an MPP detection and stop mechanism. When a fan tracks to the neighbourhoods of the MPP, the MPP detection and stop mechanism not only can be used for effectively reducing the abrasion of the rotation speed oscillation to mechanical parts of a fan system but also can overcome the interference on judging a searching direction when a wind speed changes again after an algorithm stop mechanism becomes effective so as to further increase a wind power capturing efficiency. The effectiveness and the superiority of the algorithm can be verified by a simulation result.

Description

Method based on the control of the MPPT maximum power point tracking of wind-power electricity generation

Technical field

The invention belongs to wind power generation field, particularly a kind of method of controlling based on the MPPT maximum power point tracking of wind-power electricity generation.

Background technique

Along with energy crisis is on the rise, the development and utilization of renewable energy sources is seemed more and more important.Wind-power electricity generation is to study more a kind of renewable energy sources.The capturing wind energy of maximal efficiency and prolong the hot issue that unit durability is wind-power electricity generation research how.The maximal wind-energy tracking that appears as of variable-speed constant-frequency wind power generation system provides technological approaches, adjust in real time the rotating speed of blower fan according to the variation of wind speed, guarantee that fan operation is the basic ideas that realize MPPT maximum power point tracking (MPPT, Maximum Power Point Tracking) on MPP.

MPPT maximum power point tracking algorithm commonly used has tip speed ratio method, power curve method and climbing method.Because climbing method can search MPP adaptively, do not rely on measuring wind speed and to the knowing in advance of fan characteristic parameter, thereby in the small wind unit, be widely used.Yet climbing method changes problems such as causing direction of search erroneous judgement at the contradiction of speed oscillation, search speed and the wind energy capture rate at MPP place and wind speed and receives publicity all the more.

The judgement of the tradition climbing method direction of search depends on the change direction of output power, and output power is subject to the double influence of rotating speed disturbance initiatively and wind speed variation.The stochastic volatility of wind speed is so that wind speed is in state of changing in the overwhelming majority time, and the search for errors direction of bringing thus is very important on the impact of wind energy capture rate.In addition, traditional climbing method is not to stop disturbance after searching MPP, but continues disturbance, thereby causes rotating speed and output power to be vibrated near MPP.The long-term vibration of the drive line of bringing thus can cause larger infringement to the blower fan mechanical part.The reason of tradition climbing method speed oscillation is that it does not possess the maximum power point detection and stops mechanism.

Climbing method is the MPPT method that is applied to photovoltaic generating system the earliest, thus for the research of above-mentioned two problems mainly based on field of photovoltaic power generation, less based on the correlative study of wind-power generating system.

Summary of the invention

Technical problem solved by the invention is to provide a kind of method of controlling based on the MPPT maximum power point tracking of wind-power electricity generation, has greatly improved the wind energy capture rate.

The technical solution that realizes the object of the invention is: a kind of improvement hill-climbing algorithm of controlling based on the MPPT maximum power point tracking of wind-power electricity generation may further comprise the steps:

Step 1, carry out initialization to following the tracks of control based on the maximum power point of wind electric power generation that improves hill-climbing algorithm, initialized content comprises the initial speed ω that measures wind energy conversion system _r(0), measures initial output power P corresponding to wind-power generating system _e(0), sets initial speed disturbance step-length and for the first time disturbance rotating speed of target; Be specially carrying out initialization based on the maximum power point of wind electric power generation tracking control that improves hill-climbing algorithm:

The initial speed ω of step 11, measurement wind energy conversion system _r(0) and initial output power P corresponding to wind-power generating system _e(0);

Step 12, setting sampling number k=0 set initial speed disturbance step delta ω _r(k+1) ≠ 0, calculate the k+1 disturbance rotating speed of target in step, make afterwards k=k+1, used formula is:

ω _r(k+1)=ω _r(k)+Δω _r(k+1)

Wherein, ω _r(k) and Δ ω _r(k+1) be respectively the rotating speed of the k time sampling and the k+1 time rotating speed disturbance step-length;

Step 2, carry out the k time rotating speed disturbance, namely control rotating speed to the disturbance rotating speed of target, measure the output power P of system during end _e(k), check rotating speed disturbance step delta ω _r(k) whether equal zero, if be not equal to zero, execution in step 3; Otherwise, execution in step 5;

The slope of step 3, rated output--speed curves | Δ P _e(k)/Δ ω _r(k) |, check whether satisfy | Δ P _e(k)/Δ ω _r(k) |＜ε, if do not satisfy execution in step 4; Otherwise, execution in step 6; Wherein ε is a very little positive number, and the size of ε determines the time of searching algorithm termination and the gap of system stability operation point and maximum power point;

Step 4, rotating speed disturbance step-length is adjusted COEFFICIENT K _MSet, namely set K _M=a, a＞0 is calculated the k+1 rotating speed disturbance step delta ω in step afterwards _r(k+1), execution in step 8 afterwards, and used formula is:

${\mathrm{\Δ\ω}}_r(k+1)=K_M\frac{{\mathrm{\ΔP}}_e\left(k\right)}{{\mathrm{\Δ\ω}}_r\left(k\right)}=K_M\frac{P_e\left(k\right)-P_e(k-1)}{{\mathrm{\ω}}_r\left(k\right)-{\mathrm{\ω}}_r(k-1)};$

Step 5, inspection output power variable quantity | Δ P _e(k) | whether greater than β, if be not more than, execution in step 6; Otherwise, execution in step 7, wherein β is positive threshold values, the impact of judgement is restarted in the faint fluctuation of its maskable wind speed on search;

Step 6, the disturbance step-length is set adjusts COEFFICIENT K _M=0, and calculate the k+1 rotating speed disturbance step delta ω in step _r(k+1), execution in step 8 afterwards, and used formula is:

${\mathrm{\Δ\ω}}_r(k+1)=K_M\frac{{\mathrm{\ΔP}}_e\left(k\right)}{{\mathrm{\Δ\ω}}_r\left(k\right)}=K_M\frac{P_e\left(k\right)-P_e(k-1)}{{\mathrm{\ω}}_r\left(k\right)-{\mathrm{\ω}}_r(k-1)};$

The rotating speed disturbance step-length in step 7, calculating k+1 step:

Δω _r(k+1)=Δω _rst=sign(ΔP _e(k))*b

B＞0 long the amplitude that starts of attaching most importance to wherein, execution in step 8 afterwards;

The disturbance rotating speed of target ω in step 8, calculating k+1 step _r(k+1), used formula is:

ω _r(k+1)=ω _r(k)+Δω _r(k+1)

Wherein, ω _r(k) and Δ ω _r(k+1) be respectively the rotating speed of the k time sampling and the k+1 time rotating speed disturbance step-length, make afterwards k=k+1 and return step 2.

The present invention compared with prior art, its remarkable advantage is: 1) the present invention has advanced Efficient Development and the utilization of new energy; Near when 2) the present invention improvement hill-climbing algorithm of proposing has overcome blower fan and tracks to the MPP speed oscillation effectively reduces this vibration to the wearing and tearing of blower fan system mechanical part; 3) the present invention has overcome algorithm and has stopped the mechanism interference that rear wind speed judges the direction of search when again changing that comes into force, thereby has greatly improved the wind energy capture rate; 4) the improvement hill-climbing algorithm principle that proposes of the present invention is simple and be easy to realize.

Below in conjunction with accompanying drawing the present invention is described in further detail.

Description of drawings

Fig. 1 is the improvement hill-climbing algorithm flow chart of controlling based on the MPPT maximum power point tracking of wind-power electricity generation of the present invention.

Fig. 2 is the rotating-speed tracking curve (heavy line-MPP place speed oscillation) of fixed step size climbing method.

Fig. 3 for the rotating-speed tracking curve that improves climbing method and traditional variable step climbing method (

The judgement of-the direction of search makes mistakes).

Fig. 4 be fixed step size climbing method rotating-speed tracking curve ( The judgement of-the direction of search makes mistakes).

Fig. 5 be traditional variable step climbing method rotating-speed tracking curve (

The judgement of-the direction of search makes mistakes).

Fig. 6 for improve climbing method rotating-speed tracking curve (

-direction of search correct judgment).

Fig. 7 be fixed step size climbing method rotating-speed tracking curve (

The judgement of-the direction of search makes mistakes).

Fig. 8 be traditional variable step climbing method rotating-speed tracking curve (

The judgement of-the direction of search makes mistakes).

Fig. 9 for improve climbing method rotating-speed tracking curve (

-direction of search correct judgment).

Embodiment

The present invention will on the basis of existing variable step climbing method, propose the MPP measuring ability and stop/restarting mechanism.And part solves wind speed to the interference problem of the direction of search, can get rid of wind speed when namely wind speed changes again after stopping mechanism and coming into force and change the interference that the direction of search is judged.Thereby realize the undisturbed efficient MPPT control in MPP place.

1, MPP detects and stops the realization principle of mechanism

Power-the speed curves of wind energy conversion system had unique extreme value when wind speed was constant, and the extreme point place satisfies dP _m/ d ω _rWherein, P _mBe the mechanical output of wind energy conversion system, unit is W, ω _rBe the wind energy conversion system rotating speed, unit is rad/s.Therefore, incite somebody to action | Δ P _e/ Δ ω _r|＜ε and thinks that algorithm has detected MPP as the search stop condition.Wherein, P _eBe wind-power generating system output power (because mechanical output P _mDifficult the measurement used the output power P after the rotating speed disturbance response is stablized usually in the climbing method implementation process _eReplace P _m), ε is a very little positive number, the size of ε determines the time of searching algorithm termination and the gap of system stability operation point and MPP.Improve algorithm by formula (1) deterministic disturbances step-length.

${\mathrm{\Δ\ω}}_r(k+1)=K_M\frac{{\mathrm{\ΔP}}_e\left(k\right)}{{\mathrm{\Δ\ω}}_r\left(k\right)}=K_M\frac{P_e\left(k\right)-P_e(k-1)}{{\mathrm{\ω}}_r\left(k\right)-{\mathrm{\ω}}_r(k-1)}---\left(1\right)$

Wherein, k, k-1 and k+1 are sampling number, K _MBeing the coefficient of adjusting the disturbance step-length, also is simultaneously that control improves the parameter whether algorithm stops.

In the time of in being in search procedure, K _MSetting consistent with traditional variable step climbing method; When satisfying | Δ P _e/ Δ ω _r| during＜ε, K is set namely _M=0, Δ ω then _r=0, suspend the disturbance rotating speed, system is in stable state.

2, restart the realization principle of mechanism

When fan operation during in the MPP of constant wind speed, stop mechanism and come into force.At this moment, blower fan is in stable state, satisfies in theory Δ ω _r=0 and Δ P _e=0.Only has when wind speed changes again Δ P _e≠ 0.Need an again given rotating speed disturbance Δ ω this moment _Rst, the search procedure of a beginning new round.

In improving climbing method, incite somebody to action | Δ P _e| β is set to search for the condition of restarting.That is, as | Δ P _e| think that just wind speed changes during β, and then trigger new round search.Wherein, β is positive threshold values, and the impact of judgement is restarted in the faint fluctuation of its maskable wind speed on search.

3, stopping the mechanism rear wind resistance rapid-curing cutback that comes into force disturbs

After improving algorithm and stopping the rotating speed disturbance, the variable quantity that β appears surpassing in power first can be thought to be changed by wind speed fully and causes.At this moment, as long as the sudden change of amplitude does not appear in wind speed, can think sign (Δ v)=sign (Δ P _e), wherein Δ v is the wind speed variable quantity.And by the optimal power curve as can be known, the optimized rotating speed under the different wind speed increases along with the increase of wind speed.Therefore, when the search by hill climbing algorithm was restarted in the wind speed variation, the direction of search should satisfy

sign(Δω _rst)=sign(Δv)=sign(ΔP _e) (2)

Wherein, Δ ω _RstRotating speed disturbing quantity when restarting for algorithm.Like this, overcome the wrongheaded problem of the direction of search in the time of can wind speed changes again after stopping mechanism and coming into force.

In conjunction with Fig. 1, a kind of improvement hill-climbing algorithm of controlling based on the MPPT maximum power point tracking of wind-power electricity generation of the present invention may further comprise the steps:

Step 1, carry out initialization to following the tracks of control based on the maximum power point of wind electric power generation that improves hill-climbing algorithm, initialized content comprises the initial speed ω that measures wind energy conversion system _r(0), measures initial output power Pe (0) corresponding to wind-power generating system, setting initial speed disturbance step-length and for the first time disturbance rotating speed of target; Be specially carrying out initialization based on the maximum power point of wind electric power generation tracking control that improves hill-climbing algorithm:

The initial speed ω of step 11, measurement wind energy conversion system _r(0) and initial output power Pe (0) corresponding to wind-power generating system;

Step 12, setting sampling number k=0 set initial speed disturbance step delta ω _r(k+1) ≠ 0, calculate the k+1 disturbance rotating speed of target in step, make afterwards k=k+1, used formula is:

ω _r(k+1)=ω _r(k)+Δω _r(k+1)

Wherein, ω _r(k) and Δ ω _r(k+1) be respectively the rotating speed of the k time sampling and the k+1 time rotating speed disturbance step-length;

Step 2, carry out the k time rotating speed disturbance, namely control rotating speed to the disturbance rotating speed of target, measure the output power P of system during end _e(k), check rotating speed disturbance step delta ω _r(k) whether equal zero, if be not equal to zero, execution in step 3; Otherwise, execution in step 5;

The slope of step 3, rated output--speed curves | Δ P _e(k)/Δ ω _r(k) |, check whether satisfy | Δ P _e(k)/Δ ω _r(k) |＜ε, if do not satisfy execution in step 4; Otherwise, execution in step 6; Wherein ε is a very little positive number, and the size of ε determines the time of searching algorithm termination and the gap of system stability operation point and maximum power point;

Step 4, rotating speed disturbance step-length is adjusted COEFFICIENT K _MSet, namely set K _M=a, a＞0 is calculated the k+1 rotating speed disturbance step delta ω in step afterwards _r(k+1), execution in step 8 afterwards, and used formula is:

${\mathrm{\Δ\ω}}_r(k+1)=K_M\frac{{\mathrm{\ΔP}}_e\left(k\right)}{{\mathrm{\Δ\ω}}_r\left(k\right)}=K_M\frac{P_e\left(k\right)-P_e(k-1)}{{\mathrm{\ω}}_r\left(k\right)-{\mathrm{\ω}}_r(k-1)};$

Step 5, inspection output power variable quantity | Δ P _e(k) | whether greater than β, if be not more than, execution in step 6; Otherwise, execution in step 7, wherein β is positive threshold values, the impact of judgement is restarted in the faint fluctuation of its maskable wind speed on search;

Step 6, the disturbance step-length is set adjusts COEFFICIENT K _M=0, and calculate the k+1 rotating speed disturbance step delta ω in step _r(k+1), execution in step 8 afterwards, and used formula is:

${\mathrm{\Δ\ω}}_r(k+1)=K_M\frac{{\mathrm{\ΔP}}_e\left(k\right)}{{\mathrm{\Δ\ω}}_r\left(k\right)}=K_M\frac{P_e\left(k\right)-P_e(k-1)}{{\mathrm{\ω}}_r\left(k\right)-{\mathrm{\ω}}_r(k-1)};$

The rotating speed disturbance step-length in step 7, calculating k+1 step:

Δω _r(k+1)=Δω _rst=sign(ΔP _e(k))*b

B＞0 long the amplitude that starts of attaching most importance to wherein, execution in step 8 afterwards;

The disturbance rotating speed of target ω in step 8, calculating k+1 step _r(k+1), used formula is:

ω _r(k+1)=ω _r(k)+Δω _r(k+1)

Wherein, ω r (k) and Δ ω _r(k+1) be respectively the rotating speed of the k time sampling and the k+1 time rotating speed disturbance step-length, make afterwards k=k+1 and return step 2.

Below in conjunction with embodiment the present invention is done further detailed description:

The present invention adopts step wind speed, periodicity slope wind speed and complicated wind speed to fixed step size climbing method, traditional variable step climbing method and improves climbing method and is analyzed from rotating-speed tracking and wind energy capture rate two aspects.

Wherein fan parameter is: wind energy conversion system radius 2.5m, and rated wind speed 12m/s, direct-driving type, system's equivalent moment of inertia are 22.16kgm ², optimum tip-speed ratio is λ _Opt=6.325, C _Pmax=0.4382, maximum electromagnetic torque 6.65e2Nm.The parameter of improving hill-climbing algorithm is: a=1.0e-2, and ε=1e-1, b=1, β=10, the disturbance cycle is T _s=0.1s.

Set up the wind-power generating system model, write the hill-climbing algorithm program of improving, utilize and improve hill-climbing algorithm realization MPPT control, specifically carry out according to following steps:

Operation wind-power generating system model (improving the hill-climbing algorithm program will move simultaneously) is with T _sFor the cycle is carried out the rotating speed disturbance.

Step 1, carry out initialization to following the tracks of control based on the maximum power point of wind electric power generation that improves hill-climbing algorithm, be specially:

The initial speed ω of step 11, measurement wind energy conversion system _r(0) and initial output power P corresponding to wind-power generating system _e(0);

Step 12, setting sampling number k=0 set initial speed disturbance step delta ω _r(k+1) ≠ 0, calculate the k+1 disturbance rotating speed of target in step, make afterwards k=k+1, used formula is:

ω _r(k+1)=ω _r(k)+Δω _r(k+1)

Step 2, carry out the k time rotating speed disturbance, measure the output power P of system during end _e(k), check rotating speed disturbance step delta ω _r(k) whether equal zero, if be not equal to zero, execution in step 3; Otherwise, execution in step 5;

Step 3, calculating | Δ P _e(k)/Δ ω _r(k) |, check whether satisfy | Δ P _e(k)/Δ ω _r(k) |＜ε, if do not satisfy execution in step 4; Otherwise, execution in step 6;

Step 4, setting K _M=a, a＞0 is calculated the k+1 rotating speed disturbance step delta ω in step afterwards _r(k+1), execution in step 8 afterwards, and used formula is:

${\mathrm{\Δ\ω}}_r(k+1)=K_M\frac{{\mathrm{\ΔP}}_e\left(k\right)}{{\mathrm{\Δ\ω}}_r\left(k\right)}=K_M\frac{P_e\left(k\right)-P_e(k-1)}{{\mathrm{\ω}}_r\left(k\right)-{\mathrm{\ω}}_r(k-1)}$

Step 5, inspection | Δ P _e(k) | whether greater than β, if be not more than, execution in step 6; Otherwise, execution in step 7;

Step 6, K is set _M=0, and calculate the k+1 rotating speed disturbance step delta ω in step _r(k+1), execution in step 8 afterwards, and used formula is:

${\mathrm{\Δ\ω}}_r(k+1)=K_M\frac{{\mathrm{\ΔP}}_e\left(k\right)}{{\mathrm{\Δ\ω}}_r\left(k\right)}=K_M\frac{P_e\left(k\right)-P_e(k-1)}{{\mathrm{\ω}}_r\left(k\right)-{\mathrm{\ω}}_r(k-1)}$

The rotating speed disturbance step-length in step 7, calculating k+1 step, execution in step 8 afterwards; Used formula is:

Δω _r(k+1)=Δω _rst=sign(ΔP _e(k))*b

The disturbance rotating speed of target ω in step 8, calculating k+1 step _r(k+1), used formula is:

ω _r(k+1)=ω _r(k)+Δω _r(k+1)

Make afterwards k=k+1 and return step 2.

Carry out rotating speed control by above step and will make wind-power generating system under different wind regime, follow the tracks of maximum power point, namely realize MPPT maximum power point tracking control.

1, step wind speed

A. rotating-speed tracking comparative analysis

In conjunction with Fig. 2 and Fig. 3 the rotating-speed tracking of wind-power generating system to the step wind speed is analyzed.

B. wind energy capture rate contrast

The wind energy capture rate of wind-power generating system to the step wind speed is analyzed.Calculate the wind energy capture rate of three kinds of hill-climbing algorithms, used formula is:

$\mathrm{\η}=1-\frac{{\mathrm{\ΔP}}_{\max }}{P_{\max }}=\underset{0}{\overset{\mathrm{time}}{\∫}}{P}_{\mathrm{real}}\mathrm{dt}/\underset{0}{\overset{\mathrm{time}}{\∫}}{P}_{\max }\mathrm{dt}$

Wherein, Δ P _MaxBe wasted power, P _RealBe the wind energy of actual acquisition, P _MaxBe the peak output that should catch in theory, time is the emulation duration.

The capture rate of fixed step size climbing method is 97.11%; Tradition variable step climbing method is 97.53%; Improving climbing method is 99.2%.

Can find out by contrast:

(1) traditional climbing method does not possess maximum power point and detects and stop mechanism, causes rotating speed vibrate near MPP (such as Fig. 2 heavy line part and shown in Figure 3), just and the improvement climbing method is searched for stop the rotating speed disturbance to MPP, as shown in Figure 3.These characteristics have been improved the wearing and tearing of speed oscillation to mechanical part, have certain meaning to prolonging unit durability;

(2) improve climbing method and overcome wind speed when wind speed changes again after stopping mechanism and coming into force and change the interference that the direction of search is judged, and traditional climbing method is subject to the interference that wind speed changes and the wrong direction of search occurred, shown in the oval sign of Fig. 3 point-like.

2, periodicity slope wind speed

A. rotating-speed tracking comparative analysis

In conjunction with Fig. 4, Fig. 5 and Fig. 6 the rotating-speed tracking of wind-power generating system to periodicity slope wind speed is analyzed.

B. wind energy capture rate contrast

The wind energy capture rate of wind-power generating system to periodicity slope wind speed is analyzed.Calculate the wind energy capture rate of three kinds of hill-climbing algorithms, used formula is:

$\mathrm{\η}=1-\frac{{\mathrm{\ΔP}}_{\max }}{P_{\max }}=\underset{0}{\overset{\mathrm{time}}{\∫}}{P}_{\mathrm{real}}\mathrm{dt}/\underset{0}{\overset{\mathrm{time}}{\∫}}{P}_{\max }\mathrm{dt}$

The capture rate of fixed step size climbing method is 95.09%; Tradition variable step climbing method is 96.74%; Improving climbing method is 97.43%.

Annotate: improve mistake still can appear in algorithm before stopping machine-processed Pending The Entry Into Force the direction of search (fluctuations of speed in such as Fig. 6 during all slope wind speed), this is that this algorithm still needs improved place.Owing to there is identical direction erroneous judgement problem in other two kinds of algorithms, thereby simulation result only contrasts and improves that algorithm can overcome and the unvanquishable part of traditional algorithm (being 10s, 30s, 50s and 70s among Fig. 6 and 18s, 57s and the 80s among Fig. 9), can be with reference to property with what guarantee comparative result.

Also can find out from above contrast: than traditional algorithm, improve speed oscillation (such as the amplification of the part among Fig. 5 and Fig. 6) that algorithm overcome MPP place and algorithm stop mechanism coming into force rear wind speed when again changing to the interference of the direction of search, and improved capture rate.

3, complicated wind speed

A. rotating-speed tracking comparative analysis

In conjunction with Fig. 7, Fig. 8 and Fig. 9 the rotating-speed tracking of wind-power generating system to complicated wind speed is analyzed.

B. wind energy capture rate contrast

The wind energy capture rate of wind-power generating system to complicated wind speed is analyzed.Calculate the wind energy capture rate of three kinds of hill-climbing algorithms, used formula is:

$\mathrm{\η}=1-\frac{{\mathrm{\ΔP}}_{\max }}{P_{\max }}=\underset{0}{\overset{\mathrm{time}}{\∫}}{P}_{\mathrm{real}}\mathrm{dt}/\underset{0}{\overset{\mathrm{time}}{\∫}}{P}_{\max }\mathrm{dt}$

The capture rate of fixed step size climbing method is 96.07%; Tradition variable step climbing method is 95.3%; Improving climbing method is 96.66%.

As can be seen from Figure 9, improve climbing method after stopping mechanism and coming into force, keep invariablenes turning speed, give up the tracking to the wind speed minor fluctuations, for traditional climbing method, reduced the wind-engaging rapid-curing cutback to disturb and the probability of search for errors direction occurs, and wind speed guarantees the correctness of the direction of search when again changing.Reduce on the whole the probability that the direction of search is made mistakes, improved the capture rate under the complicated wind speed.

Claims (2)

1. method based on the control of the MPPT maximum power point tracking of wind-power electricity generation, it adopts the improvement hill-climbing algorithm, it is characterized in that, may further comprise the steps:

Step 1, carry out initialization to following the tracks of control based on the maximum power point of wind electric power generation that improves hill-climbing algorithm, initialized content comprises the initial speed of measuring wind energy conversion system

, measure initial output power corresponding to wind-power generating system

, set initial speed disturbance step-length and for the first time disturbance rotating speed of target;

Step 2, carry out kInferior rotating speed disturbance is namely controlled rotating speed to the disturbance rotating speed of target, measures system's output power during end

, check rotating speed disturbance step-length Whether equal zero, if be not equal to zero, execution in step 3; Otherwise, execution in step 5;

The slope of step 3, rated output--speed curves

, check whether satisfy

If do not satisfy execution in step 4; Otherwise, execution in step 6; Wherein

A very little positive number,

Size determine time that searching algorithm stops and the gap of system stability operation point and maximum power point;

Step 4, rotating speed disturbance step-length is adjusted coefficient

Set, namely set

, calculate kThe rotating speed disturbance step-length in+1 step

, execution in step 8 afterwards, and used formula is:

；

Step 5, inspection output power variable quantity

Whether greater than βIf be not more than execution in step 6; Otherwise, execution in step 7, wherein βBe positive threshold values, the impact of judgement is restarted in the faint fluctuation of its maskable wind speed on search;

Step 6, the disturbance step-length is set adjusts coefficient

, and calculate kThe rotating speed disturbance step-length in+1 step

, execution in step 8 afterwards, and used formula is:

；

Step 7, calculating kThe rotating speed disturbance step-length in+1 step:

Wherein

The long amplitude that starts of attaching most importance to, execution in step 8 afterwards;

Step 8, calculating kThe disturbance rotating speed of target in+1 step

, used formula is:

Wherein, With Be respectively kThe rotating speed of inferior sampling and K+1 time rotating speed disturbance step-length, afterwards order k= k+ 1 and return step 2.

2. the method for the MPPT maximum power point tracking control based on wind-power electricity generation according to claim 1, it adopts the improvement hill-climbing algorithm, it is characterized in that, and step 1 pair is followed the tracks of control based on the maximum power point of wind electric power generation that improves hill-climbing algorithm and is carried out initialization and be specially:

The initial speed of step 11, measurement wind energy conversion system

The initial output power corresponding with wind-power generating system

Step 12, setting sampling number k=0, set initial speed disturbance step-length

, calculate K+The disturbance rotating speed of target in 1 step, afterwards order K=k+1, used formula is:

Wherein,

With

Be respectively kThe rotating speed of inferior sampling and K+1 time rotating speed disturbance step-length.

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