CN104950982B - Dual feedback wind power generation system maximum power tracking and controlling method based on many step-lengths - Google Patents
Dual feedback wind power generation system maximum power tracking and controlling method based on many step-lengths Download PDFInfo
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Abstract
The invention discloses the dual feedback wind power generation system maximum power point-tracing control method based on many step-lengths, the wind power generating set parameter determination initial disturbance step-length that the method is provided according to blower fan manufacturer first.Using function M=P*abs（dP/dn）Wind energy conversion system P n curves are demarcated.In maximum power point left field, when the value of function dM/dn is more than 0, step-length d is taken1；When the value of function dM/dn is less than 0, when M is more than power P, step-length d is taken1, when M is less than power P, take step-length d1*M/P.In maximum power point right side area, when the value of function dM/dn is less than 0, step-length d is taken2；When the value of function dM/dn is more than 0, when M is more than power P, step-length d is taken2, when M is less than power P, take step-length d2*M/P.The present invention solves the problems, such as that most of maximal power tracing controls can not be while take into account stable state accuracy and dynamic tracking velocity.
Description
Technical field
The invention belongs to wind energy power technology field, especially a kind of dual feedback wind power generation system based on many step-lengths is maximum
Power tracking control method.
Background technology
Wind energy content enriches, and in acquisition, environment-protecting clean is the regenerative resource of most Commercial Prospect, is just obtaining big
The development and utilization of scale.At present, wind energy occupies obvious advantage, wind generating technology in the regenerative resource being utilized
Also develop more ripe.Dual feedback wind power generation system compared to traditional constant-speed and constant-frequency wind generator system, with can realize
The tracking of maximal wind-energy, wind energy utilization advantage high.
The efficiency of wind generator system is one of most important index of wind generator system, and wind generator system is carried out to big
Power points tracking is the important channel of the efficiency for improving wind generator system.However, due to the unstability of wind speed, wind energy is one
Planting has randomness, the instable energy, realizes that wind energy conversion system follows the trail of maximal wind-energy relatively difficult.Mesh wind generator system is most
Big wind energy pursive strategy mainly has：Optimum tip-speed ratio method, power signal feedback transmitter, search by hill climbing method etc..Search by hill climbing method without
Wind speed need to be measured, the power characteristic of known wind energy conversion system is also not required to, but artificially applies rotating speed shock wave amount, according to generator
Power output change determine rotation speed of fan controlling increment, by control generator electromagnetic torque so that rotation speed of fan tend to
It is fixed, above-mentioned search strategy is performed repeatedly, until wind power system operates in maximum power point.Although climbing method can trace into maximum
Power points, but it is influenceed larger by disturbance step-length, and maximum power point can be quickly traced into when disturbing step-length and being larger, but
Vibrated at maximum power point larger；When disturbing step-length and being smaller, although vibration is smaller at maximum power point, but during tracking
Between it is more long, tracking velocity is not high.
Find by prior art documents, A Variable Speed Control of theInduction
Generator without Speed Sensor for Wind Generation (C.Rikiishi, Y.Hayashi,
N.Sato, " A Variable Speed Control of theInduction Generator without Speed
Sensor for Wind Generation ", IEEE Japan, VoIIIO-D, N06, pp.664-672) propose one kind
Two-step search by hill climbing method long, can to a certain extent improve systematic steady state performance and dynamic property, but three in algorithm
Setting value:Big step-length, small step-length, threshold value are difficult to determine.Control ofa Switched Reluctance Generator
For Variable-Speed Wind Energy Applications (Roberto Cardenas, Ruben Pena,
Marcelo Perez, Jon Clare, Greg Asher, Patrick Wheeler, " Control ofa Switched
Reluctance Generator for Variable-Speed Wind Energy Applications ", IEEE
Transactions on Energy Conversion, vol. 20, no. 4, Dec 2005.) propose a kind of variable step
Search by hill climbing method, determined by comparing three power of point of sampling disturb step sizes, can wind speed change it is little
In the case of improve systematic steady state performance and dynamic property, but take point tolerance too greatly when wind speed change is very fast, possibly cannot be real
Existing maximal power point tracking.A Novel Algorithm for Fast and Efficient Maximum Power Point
Tracking of Wind Energy Conversion Systems(Kazmi Syed Muhammad Raza, Hiroki
Goto, Hai-Jiao Guo, " A Novel Algorithm for Fast and Efficient Maximum Power
Point Tracking of Wind Energy Conversion Systems ", Proc. ofthe 2008
International Conference on Electrical Machines, ICEM, Sept.2008.) in discuss one
The variable step-size search method based on slope is planted, the method for seeking variable step is given, the response speed of system can be simultaneously significantly improved
And stable state, but a suitable Proportional coefficient K needed for algorithm is difficult to determine, and anti-interference is poor.
Not enough for more than, the present invention considers dual feedback wind power generation system dynamic property and steady-state behaviour, according to wind
The fan parameter that machine manufacturer provides determines maximum power point left side, the size of right side initial disturbance step-length, and utilizes wind-force
Machine power output is carried out with the product of wind energy conversion system power output to the absolute value of the derivative of wind energy conversion system rotating speed to wind energy conversion system P-n curves
Boundary, different disturbance step-lengths is used in different border regions, can preferably improve the steady-state behaviour of wind generator system
And dynamic property.
The content of the invention
The invention aims to solve above-mentioned the shortcomings of the prior art, there is provided one kind is based on many step-lengths
Dual feedback wind power generation system maximum power tracking and controlling method, can reduce simultaneously dual feedback wind power generation system steady state power loss
With the dynamic tracking velocity of raising, optimize the design procedure of dual feedback wind power generation system maximal power tracing control algolithm.
The purpose of the present invention is achieved through the following technical solutions.
Dual feedback wind power generation system maximum power tracking and controlling method based on many step-lengths, comprises the following steps：
（1）The initial disturbance step-length applied with right side on the left of maximum power point for setting wind energy conversion system rotating speed is d1And d2；
（2）Sampling k moment wind energy conversion system power output P (k), wind energy conversion system rotating speed n (k)；
（3）Calculate wind energy conversion system power output variation delta P (k)=P (k)-P (k-1), the wind energy conversion system rotation speed change amount at k moment
Δn(k)=n(k)-n(k-1)；Wherein P (k-1), n (k-1) are the wind energy conversion system power output and wind energy conversion system rotating speed at k-1 moment；
（4）Judge whether Δ P (k) is 0；If 0, then do not change wind energy conversion system rotating speed n, return and continue to sample；If judging Δ P
K () ≠ 0, then judge that whether Δ P (k) * Δs n (k), more than or equal to zero, if Δ P (k) * Δs n (k) >=0, illustrates system work at present
On the left of maximum power point, selection step-length is d to point1, positive disturbance is applied to wind energy conversion system rotating speed n；If Δ P (k) * Δs n (k)<0,
On the right side of maximum power point, selection step-length is d to explanation system present operating point2, negative sense disturbance is applied to wind energy conversion system rotating speed n；
（5）Repeat step（2）~ step（4）Until system is operated in maximum power point.
Further, the initial step length d of maximum power point both sides is acted on1And d2, the two meets relational expression：d1=60*fN/
(30*p) and d2=60*fN/ (50*p), wherein fNIt is wind energy conversion system rated frequency, p wind energy conversion system numbers of pole-pairs, external environmental condition change
When, d1And d2Value it is invariable, be constant.
3. the dual feedback wind power generation system maximal power tracing controlling party based on many step-lengths according to claim 1
Method, it is characterised in that when system operating point is located at maximum power point left side, the disturbance step-length of wind energy conversion system rotating speed n is as follows
Adjust：Function M (k)=P (k) * abs (Δ P (k)/Δ n (k)) are calculated, if variable quantity M (k) of function M (k)=M (k)-M (k-
1), if judging, M (k)/n (k) is more than 0, takes step-length for d1；If M (k)/n (k) is less than 0, whether M (k) is judged
More than or equal to P (k), if M (k) >=P (k), step-length is taken for d1If, M (k)<P (k), then take step-length for d1*M(k)/P(k)；Wherein
Abs () is ABS function, and M (k-1) is the functional value of the function M at k-1 moment.
Further, when system operating point is located at maximum power point right side, the disturbance step-length of wind energy conversion system rotating speed n is by as follows
Mode is adjusted：Calculate M (k)=P (k) * abs（ΔP(k)/Δn(k)）If, variable quantity M (k)=M (k)-M (k- of function M (k)
1) whether, if judging, M (k)/n (k) is more than 0, M (k) is judged more than or equal to P (k), if M (k) >=P (k), takes step-length
It is d2If, M (k)<P (k), then take step-length for d2*M(k)/P(k)；If M (k)/n (k) is less than 0, step-length is taken for d2, wherein
Abs () is ABS function, and M (k-1) is the functional value of the function M at k-1 moment.
Compared with prior art, the present invention has the following effects that：The present invention provides a kind of determination both sides initial disturbance step-length
On the basis of, the thought demarcated to wind energy conversion system P-n characteristic curves using correlation function is determined variable step and two kinds becomes step using two kinds
The maximum power point of tracking wind generator system long, improves the speed and lasting accuracy of MPPT maximum power point tracking, reduces and is
System vibration, can track the peak power output of wind energy conversion system fast and stable, meet the requirement of system maximal power tracing.
Brief description of the drawings
Fig. 1 is a kind of dual feedback wind power generation system maximal power tracing control algolithm flow chart based on many step-lengths；
Fig. 2 is traditional fixed step size search by hill climbing method and modified variable step search by hill climbing method simulated effect figure.
Specific embodiment
With reference to embodiment and accompanying drawing, the present invention is further detailed explanation, but embodiments of the present invention are not
It is limited to this.
The first step：According to the fan parameter that wind energy conversion system manufacturer provides：Wind energy conversion system rated frequency fN, wind energy conversion system number of pole-pairs
P, by formula d1=60*fN/ (30*p) and d2=60*fN/ (50*p) computing systems are operated in maximum power point left side and right side
When initial disturbance step-length d1And d2。
Second step：The power output of wind energy conversion system and the rotating speed of wind energy conversion system are gathered by power sensor, speed probe, will
The power and rotating speed for collecting are delivered in digital signal processor (DSP) through overpower, rotating speed modulate circuit, calculate front and rear two
Moment power deviation Δ P (k), front and rear two moment rotating speed deviation delta n (k).Calculate derivative of the current time power to rotating speed.Wherein
Power, can be using front and rear two moment power deviation Δ P (k) divided by front and rear two moment rotating speed deviation delta n (k) to the derivative of rotating speed
Carry out the derivative of approximate solution power vs. voltage.
3rd step:Whether two moment power deviation Δ P (k) absolute values are less than setting accuracy ε before and after judging1, setting accuracy ε
The stability of 1 size decision systems maximal power tracing, setting accuracy ε1Selection too senior general increases system in maximum power point ripple
It is dynamic, it is usually the smaller the better.
4th step：If less than setting accuracy ε1, then the value of wind energy conversion system rotating speed n is not changed.If power deviation Δ P (k)
Absolute value is more than setting accuracy ε1, then the value of Δ P (k) * Δs n (k) is calculated.
5th step：If Δ P (k) * Δs n (k) >=0, illustrate that system present operating point is located at maximum power point left side, calculate letter
Number M (k)=P (k) * abs（ΔP(k)/Δn(k)）If judging that M (k)/n (k) is more than 0, step-length is taken for d1, to wind energy conversion system
Rotating speed n applies positive disturbance；If M (k)/n (k) is less than 0, whether M (k) is judged more than or equal to P (k), if M (k) >=P (k),
Step-length is then taken for d1, positive disturbance is applied to wind energy conversion system rotating speed n, if M (k)<P (k), then take step-length for d1* M (k)/P (k), to wind
Power machine rotating speed n applies positive disturbance.
6th step：If Δ P (k) * Δs n (k)<0, explanation system is currently operating in maximum power point right side, calculates M (k)=P
(k)*abs（ΔP(k)/Δn(k)）If judging that M (k)/n (k) is more than 0, whether M (k) is judged more than or equal to P (k), if
M (k) >=P (k), then take step-length for d2, negative sense disturbance is applied to wind energy conversion system rotating speed n, if M (k)<P (k), then take step-length for d2*M
K ()/P (k), negative sense disturbance is applied to wind energy conversion system rotating speed n；If M (k)/n (k) is less than 0, step-length is taken for d2, to wind energy conversion system
Rotating speed n applies positive disturbance.
7th step：Step the second ~ the 6th is repeated until system is operated in maximum power point, it is of the invention by gained wind energy conversion system rotating speed
It is worth as the Setting signal of turbine controller, by the double-closed-loop control to wind-driven generator, wind energy conversion system is reached given turning
Speed reaches the purpose of maximal power tracing.
Such as Fig. 2, for same wind generator system, the capacity of wind energy conversion system is 11kW, and rated voltage is 380V, and number of pole-pairs is
2, rated frequency is 50Hz.When wind speed is 11m/s, maximum power point wind energy conversion system power output is 6250W, and maximum power point turns
Speed is 1500r/min；When wind speed is 12m/s, maximum power point wind energy conversion system power output is 8350W, maximum power point rotating speed
It is 1650r/min.Traditional fixed step size hill-climbing algorithm step value is taken for 15r/min, improvement variable step hill-climbing algorithm step value d is taken1=
50r/min, d2=30r/min.Result confirms the method relative to traditional fixed step size hill-climbing algorithm, improve maximum power point with
The speed and stability of track.
Above to a kind of maximal power tracing control of the dual feedback wind power generation system based on many step-lengths provided by the present invention
Method processed is described in detail, and specific case used herein is set forth to principle of the invention and implementation method,
The explanation of above example is only intended to help and understands the method for the present invention and its core concept；Simultaneously for the one of this area
As technical staff, according to thought of the invention, will change in specific embodiments and applications, to sum up institute
State, this specification content should not be construed as limiting the invention.
Claims (2)
1. the dual feedback wind power generation system maximum power tracking and controlling method of many step-lengths is based on, it is characterised in that including following step
Suddenly：
The initial disturbance step-length applied with right side on the left of maximum power point for setting wind energy conversion system rotating speed is d1And d2；
（2）Sampling k moment wind energy conversion system power output P (k), wind energy conversion system rotating speed n (k)；
（3）Calculate wind energy conversion system power output variation delta P (k)=P (k)-P (k-1), the wind energy conversion system rotation speed change amount Δ n at k moment
(k)=n(k)-n(k-1)；Wherein P (k-1), n (k-1) are the wind energy conversion system power output and wind energy conversion system rotating speed at k-1 moment；
（4）Judge whether Δ P (k) is 0；If 0, then do not change wind energy conversion system rotating speed n, return and continue to sample；If judging Δ P (k)
≠ 0, then judge that whether Δ P (k) * Δs n (k), more than or equal to zero, if Δ P (k) * Δs n (k) >=0, illustrates that system present operating point exists
Maximum power point left side, selection step-length is d1, positive disturbance is applied to wind energy conversion system rotating speed n；If Δ P (k) * Δs n (k)<0, explanation
On the right side of maximum power point, selection step-length is d to system present operating point2, negative sense disturbance is applied to wind energy conversion system rotating speed n；
When system operating point is located at maximum power point left side, the disturbance step-length of wind energy conversion system rotating speed n is adjusted as follows：Calculate
Function M (k)=P (k) * abs (Δ P (k)/Δ n (k)), if variable quantity M (k) of function M (k)=M (k)-M (k-1), if judging
M (k)/n (k) is more than 0, then take step-length for d1；If M (k)/n (k) is less than 0, judge M (k) whether more than or equal to P
K (), if M (k) >=P (k), takes step-length for d1If, M (k)<P (k), then take step-length for d1*M(k)/P(k)；Wherein abs () is
ABS function, M (k-1) is the functional value of the function M at k-1 moment；When system operating point is located at maximum power point right side, wind
The disturbance step-length of power machine rotating speed n is adjusted as follows：Calculate M (k)=P (k) * abs（ΔP(k)/Δn(k)）If, function M (k)
Variable quantity M (k)=M (k)-M (k-1), if judging, M (k)/n (k) is more than 0, judges whether M (k) is more than or equal to P
K (), if M (k) >=P (k), takes step-length for d2If, M (k)<P (k), then take step-length for d2*M(k)/P(k)；If M (k)/n
K () is less than 0, then take step-length for d2, wherein abs () is ABS function, and M (k-1) is the functional value of the function M at k-1 moment；
（5）Repeat step（2）~ step（4）Until system is operated in maximum power point.
2. the dual feedback wind power generation system maximum power tracking and controlling method based on many step-lengths according to claim 1, its
It is characterised by：Act on the initial step length d of maximum power point both sides1And d2, the two meets relational expression：d1=60*fN/ (30*p) and
d2=60*fN/ (50*p), wherein fNIt is wind energy conversion system rated frequency, p wind energy conversion system numbers of pole-pairs, when external environmental condition changes, d1And d2
Value it is invariable, be constant.
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Application publication date: 20150930 Assignee: Guangzhou Development Zone Yuedian new energy Co.,Ltd. Assignor: SOUTH CHINA University OF TECHNOLOGY Contract record no.: X2023980036273 Denomination of invention: Maximum power tracking control method for doubly fed wind power generation system based on multi-step size Granted publication date: 20170606 License type: Common License Record date: 20230615 |
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