CN104950982A - Double-fed wind power generation system maximum power tracking control method based on multiple steps - Google Patents
Double-fed wind power generation system maximum power tracking control method based on multiple steps Download PDFInfo
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Abstract
The invention discloses a double-fed wind power generation system maximum power tracking control method based on multiple steps. According to the method, firstly, an initial disturbance step length is determined according to parameters of a wind power generator set provided by a draught fan production manufacturer; boundary is carried out on a P-n curve of a wind turbine through the function M=P*abs(dP/dn); in a maximum power point left area, when the value of the function dM/dn is larger than zero, the step length d1 is obtained; when the value of the function dM/dn is smaller than zero and M is larger than power P, the step length d1 is obtained, and when M is smaller than power P, the step length d1*M/P is obtained; in a maximum power point right area, when the value of the function dM/dn is smaller than 0, the step length d2 is obtained; when the value of the function dM/dn is larger than 0 and M is larger than the power P, the step length d2 is obtained, and when M is smaller than the power P, the step length d2*M/P is obtained. The method solves the problem that most of maximum power tracking control can not take steady accuracy and dynamic tracking speed into consideration at the same time.
Description
Technical field
The invention belongs to wind energy power technology field, especially a kind of dual feedback wind power generation system maximum power tracking and controlling method long based on multistep.
Background technology
Wind energy content enriches, and in acquisition, environment-protecting clean, is the regenerative resource of most Commercial Prospect, is just obtaining large-scale development and utilization.At present, in the regenerative resource be utilized, wind energy occupies obvious advantage, and wind generating technology also develops comparatively ripe.Dual feedback wind power generation system, compared to traditional constant-speed and constant-frequency wind generator system, has the tracking that can realize maximal wind-energy, the advantage that wind energy utilization is high.
The efficiency of wind generator system is one of most important index of wind generator system, carries out the important channel of high-power point being followed the tracks of to the efficiency being raising wind generator system to wind generator system.But due to the instability of wind speed, wind energy is that one has randomness, the instable energy, realize wind energy conversion system tracking maximal wind-energy more difficult.The maximal power point tracking strategy of order wind generator system mainly contains: optimum tip-speed ratio method, power signal feedback transmitter, search by hill climbing method etc.Search by hill climbing method is without the need to measuring wind, the power characteristic of known wind energy conversion system is not needed yet, but apply rotating speed shock wave amount artificially, the controlling increment of rotation speed of fan is determined according to the change of generated output power, rotation speed of fan is made to be tending towards given by controlling generator electromagnetic torque, repeatedly perform above-mentioned search strategy, until wind power system operates in maximum power point.Although climbing method can trace into maximum power point, its impact by disturbance step-length is comparatively large, can trace into maximum power point fast when disturbance step-length is larger, but larger in the vibration of maximum power point place; When disturbance step-length is less, although less in the vibration of maximum power point place, tracking time is longer, and 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) the search by hill climbing method of a kind of pair of step-length is proposed, systematic steady state performance and dynamic property can be improved to a certain extent, but three setting values in algorithm: large step-length, little step-length, threshold value is 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 search by hill climbing method of variable step, disturbance step sizes is determined by the power of three points comparing sampling, systematic steady state performance and dynamic property can be improved when wind speed changes little, but get point tolerance too greatly when wind speed change is very fast, possibly maximal power point tracking cannot be realized.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.) a kind of variable step-size search method based on slope is discussed in, give the method for changes persuing step-length, greatly can improve response speed and the steady state (SS) of system simultaneously, but one needed for algorithm suitable Proportional coefficient K is difficult to determine, and anti-interference is poor.
For above deficiency, the present invention considers dual feedback wind power generation system dynamic property and steady-state behaviour, according on the left of the fan parameter determination maximum power point that blower fan manufacturer provides, the size of right side initial disturbance step-length, and utilize the product of wind energy conversion system output power to the absolute value of the derivative of wind energy conversion system rotating speed and wind energy conversion system output power to demarcate to wind energy conversion system P-n curve, adopt different disturbance step-lengths in different border region, can improve preferably wind generator system steady-state behaviour and dynamic property.
Summary of the invention
The object of the invention is to solve above-mentioned the deficiencies in the prior art part, a kind of dual feedback wind power generation system maximum power tracking and controlling method long based on multistep is provided, the loss of dual feedback wind power generation system steady state power can be reduced simultaneously and improve dynamic tracking velocity, optimizing the design procedure of dual feedback wind power generation system maximal power tracing control algolithm.
Object of the present invention is achieved through the following technical solutions.
Based on the dual feedback wind power generation system maximum power tracking and controlling method that multistep is long, comprise the steps:
(1) the initial disturbance step-length applied with right side on the left of maximum power point setting wind energy conversion system rotating speed is d
1and d
2;
(2) sample k moment wind energy conversion system output power P (k), wind energy conversion system rotating speed n (k);
(3) wind energy conversion system output power variation delta P (k)=P (k)-P (k-1), wind energy conversion system rotation speed change amount Δ n (k)=n (the k)-n (k-1) in k moment is calculated; Wherein P (k-1), n (k-1) be the k-1 moment wind energy conversion system output power and wind energy conversion system rotating speed;
(4) judge whether Δ P (k) is 0; If 0, then do not change wind energy conversion system rotating speed n, return and continue sampling; If judge Δ P (k) ≠ 0, then judge whether Δ P (k) * Δ n (k) is more than or equal to zero, if Δ P (k) * Δ n (k)>=0, illustrative system present operating point is on the left of maximum power point, and choosing step-length is d
1, forward disturbance is applied to wind energy conversion system rotating speed n; If Δ P (k) * Δ n (k) <0, illustrative system present operating point is on the right side of maximum power point, and choosing step-length is d
2, negative sense disturbance is applied to wind energy conversion system rotating speed n;
(5) step (2) ~ step (4) is repeated until system works is at maximum power point.
Further, the initial step length d of maximum power point both sides is acted on
1and d
2, the two meets relational expression: d
1=60*f
n/ (30*p) and d
2=60*f
n/ (50*p), wherein f
nfor wind energy conversion system rated frequency, p wind energy conversion system number of pole-pairs, during external environmental condition change, d
1and d
2value invariable, be constant.
3. the dual feedback wind power generation system maximum power tracking and controlling method long based on multistep according to claim 1, it is characterized in that when system works point is positioned on the left of maximum power point, the disturbance step-length of wind energy conversion system rotating speed n is adjusted as follows: computing 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 judge, M (k)/n (k) is greater than 0, then getting step-length is d
1; If M (k)/n (k) is less than 0, then judge whether M (k) is more than or equal to P (k), if M (k)>=P (k), then getting step-length is d
1if M (k) <P (k), then getting step-length is d
1* M (k)/P (k); Wherein abs () is ABS function, the functional value of the function M that M (k-1) is the k-1 moment.
Further, when system works point is positioned on the right side of maximum power point, the disturbance step-length of wind energy conversion system rotating speed n is adjusted as follows: calculate 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 judge, M (k)/n (k) is greater than 0, then judge whether M (k) is more than or equal to P (k), if M (k)>=P (k), then getting step-length is d
2if M (k) <P (k), then getting step-length is d
2* M (k)/P (k); If M (k)/n (k) is less than 0, then getting step-length is d
2, wherein abs () is ABS function, the functional value of the function M that M (k-1) is the k-1 moment.
Compared with prior art, the present invention has following effect: the invention provides on a kind of basis determining both sides initial disturbance step-length, utilize the thought that related function is demarcated to wind energy conversion system P-n family curve, adopt two kinds of maximum power points determining variable step and two kinds of variable step tracking wind generator systems, improve speed and the lasting accuracy of MPPT maximum power point tracking, reduce system oscillation, the peak power output of wind energy conversion system can be followed the tracks of fast and stable, meet the requirement of system maximal power tracing.
Accompanying drawing explanation
Fig. 1 is a kind of dual feedback wind power generation system maximal power tracing control algolithm process flow diagram long based on multistep;
Fig. 2 is traditional fixed step size search by hill climbing method and modified variable step search by hill climbing method simulated effect figure.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is further detailed explanation, but embodiments of the present invention are not limited thereto.
The first step: the fan parameter provided according to wind energy conversion system manufacturer: wind energy conversion system rated frequency f
n, wind energy conversion system number of pole-pairs p, by formula d
1=60*f
n/ (30*p) and d
2=60*f
n/ (50*p) computing system to be operated on the left of maximum power point and right side time initial disturbance step-length d
1and d
2.
Second step: gather the output power of wind energy conversion system and the rotating speed of wind energy conversion system by power sensor, speed probe, by the power that collects and rotating speed through overpower, rotating speed modulate circuit, deliver in digital signal processor (DSP), two moment power deviation Δ P (k), front and back two moment rotating speed deviation delta n (k) before and after calculating.Calculate current time power to the derivative of rotating speed.Wherein power is to the derivative of rotating speed, and front and back two moment power deviation Δ P (k) can be adopted to carry out the derivative of approximate solution power vs. voltage divided by front and back two moment rotating speed deviation delta n (k).
3rd step: judge whether front and back two moment power deviation Δ P (k) absolute value is less than setting accuracy ε
1, the stability of setting accuracy ε 1 size decision systems maximal power tracing, setting accuracy ε
1selecting too senior general to increase system to fluctuate at maximum power point, is generally the smaller the better.
4th step: if be less than setting accuracy ε
1, then the value of wind energy conversion system rotating speed n is not changed.If power deviation Δ P (k) absolute value is greater than setting accuracy ε
1, then the value of Δ P (k) * Δ n (k) is calculated.
5th step: if Δ P (k) * Δ n (k)>=0, illustrative system present operating point is positioned on the left of maximum power point, computing function M (k)=P (k) * abs(Δ P (k)/Δ n (k)), if judge, M (k)/n (k) is greater than 0, then getting step-length is d
1, forward disturbance is applied to wind energy conversion system rotating speed n; If M (k)/n (k) is less than 0, then judge whether M (k) is more than or equal to P (k), if M (k)>=P (k), then getting step-length is d
1, apply forward disturbance to wind energy conversion system rotating speed n, if M (k) <P (k), then getting step-length is d
1* M (k)/P (k), applies forward disturbance to wind energy conversion system rotating speed n.
6th step: if Δ P (k) * Δ n (k) <0, illustrative system work at present is on the right side of maximum power point, calculate M (k)=P (k) * abs(Δ P (k)/Δ n (k)), if judge, M (k)/n (k) is greater than 0, then judge whether M (k) is more than or equal to P (k), if M (k)>=P (k), then getting step-length is d
2, apply negative sense disturbance to wind energy conversion system rotating speed n, if M (k) <P (k), then getting step-length is d
2* M (k)/P (k), applies negative sense disturbance to wind energy conversion system rotating speed n; If M (k)/n (k) is less than 0, then getting step-length is d
2, forward disturbance is applied to wind energy conversion system rotating speed n.
7th step: repeat step the second ~ six until system works is at maximum power point, the present invention is using the Setting signal of gained wind energy conversion system tachometer value as wind energy conversion system controller, by the double-closed-loop control to aerogenerator, make wind energy conversion system reach given rotating speed, reach the object of maximal power tracing.
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, and rated frequency is 50Hz.When wind speed is 11m/s, maximum power point wind energy conversion system output power is 6250W, and maximum power point rotating speed is 1500r/min; When wind speed is 12m/s, maximum power point wind energy conversion system output power is 8350W, and maximum power point rotating speed is 1650r/min.Getting traditional fixed step size hill-climbing algorithm step value is 15r/min, gets and improves variable step hill-climbing algorithm step value d
1=50r/min, d
2=30r/min.Result confirms that the method is relative to traditional fixed step size hill-climbing algorithm, improves speed and the stability of MPPT maximum power point tracking.
Above the maximum power tracking and controlling method of a kind of dual feedback wind power generation system long based on multistep provided by the present invention is described in detail, apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (4)
1., based on the dual feedback wind power generation system maximum power tracking and controlling method that multistep is long, it is characterized in that comprising the steps:
The initial disturbance step-length applied with right side on the left of maximum power point of setting wind energy conversion system rotating speed is d
1and d
2;
(2) sample k moment wind energy conversion system output power P (k), wind energy conversion system rotating speed n (k);
(3) wind energy conversion system output power variation delta P (k)=P (k)-P (k-1), wind energy conversion system rotation speed change amount Δ n (k)=n (the k)-n (k-1) in k moment is calculated; Wherein P (k-1), n (k-1) be the k-1 moment wind energy conversion system output power and wind energy conversion system rotating speed;
(4) judge whether Δ P (k) is 0; If 0, then do not change wind energy conversion system rotating speed n, return and continue sampling; If judge Δ P (k) ≠ 0, then judge whether Δ P (k) * Δ n (k) is more than or equal to zero, if Δ P (k) * Δ n (k)>=0, illustrative system present operating point is on the left of maximum power point, and choosing step-length is d
1, forward disturbance is applied to wind energy conversion system rotating speed n; If Δ P (k) * Δ n (k) <0, illustrative system present operating point is on the right side of maximum power point, and choosing step-length is d
2, negative sense disturbance is applied to wind energy conversion system rotating speed n;
(5) step (2) ~ step (4) is repeated until system works is at maximum power point.
2. the dual feedback wind power generation system maximum power tracking and controlling method long based on multistep according to claim 1, is characterized in that: the initial step length d acting on maximum power point both sides
1and d
2, the two meets relational expression: d
1=60*f
n/ (30*p) and d
2=60*f
n/ (50*p), wherein f
nfor wind energy conversion system rated frequency, p wind energy conversion system number of pole-pairs, during external environmental condition change, d
1and d
2value invariable, be constant.
3. the dual feedback wind power generation system maximum power tracking and controlling method long based on multistep according to claim 1, it is characterized in that when system works point is positioned on the left of maximum power point, the disturbance step-length of wind energy conversion system rotating speed n is adjusted as follows: computing 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 judge, M (k)/n (k) is greater than 0, then getting step-length is d
1; If M (k)/n (k) is less than 0, then judge whether M (k) is more than or equal to P (k), if M (k)>=P (k), then getting step-length is d
1if M (k) <P (k), then getting step-length is d
1* M (k)/P (k); Wherein abs () is ABS function, the functional value of the function M that M (k-1) is the k-1 moment.
4. the dual feedback wind power generation system maximum power tracking and controlling method long based on multistep according to claim 1, it is characterized in that when system works point is positioned on the right side of maximum power point, the disturbance step-length of wind energy conversion system rotating speed n is adjusted as follows: calculate 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 judge, M (k)/n (k) is greater than 0, then judge whether M (k) is more than or equal to P (k), if M (k)>=P (k), then getting step-length is d
2if M (k) <P (k), then getting step-length is d
2* M (k)/P (k), if M (k)/n (k) is less than 0, then getting step-length is d
2, wherein abs () is ABS function, the functional value of the function M that M (k-1) is the k-1 moment.
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| US20120062202A1 (en) * | 2010-09-13 | 2012-03-15 | Byeong-Seon Min | Apparatus and method for tracking maximum power point and method of operating grid-tied power storage system using the same |
| KR101371226B1 (en) * | 2012-01-05 | 2014-03-10 | 신옥테크(주) | MPPT method for mobile PV module |
| CN104298295A (en) * | 2014-09-19 | 2015-01-21 | 华南理工大学 | Multi-step size based photovoltaic power generation system maximum power tracking control method |
| CN104454346A (en) * | 2014-11-09 | 2015-03-25 | 华北电力大学（保定） | Maximum power tracking control method for small permanent-magnet direct-drive wind power generation system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120062202A1 (en) * | 2010-09-13 | 2012-03-15 | Byeong-Seon Min | Apparatus and method for tracking maximum power point and method of operating grid-tied power storage system using the same |
| CN102072083A (en) * | 2010-12-27 | 2011-05-25 | 西安理工大学 | Maximum wind energy tracking method for double-fed wind power generation system |
| KR101371226B1 (en) * | 2012-01-05 | 2014-03-10 | 신옥테크(주) | MPPT method for mobile PV module |
| CN104298295A (en) * | 2014-09-19 | 2015-01-21 | 华南理工大学 | Multi-step size based photovoltaic power generation system maximum power tracking control method |
| CN104454346A (en) * | 2014-11-09 | 2015-03-25 | 华北电力大学（保定） | Maximum power tracking control method for small permanent-magnet direct-drive wind power generation system |
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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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