CN104123442B - A kind of online Equivalent Model modeling method of Wind turbines active power - Google Patents
A kind of online Equivalent Model modeling method of Wind turbines active power Download PDFInfo
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- CN104123442B CN104123442B CN201410323906.7A CN201410323906A CN104123442B CN 104123442 B CN104123442 B CN 104123442B CN 201410323906 A CN201410323906 A CN 201410323906A CN 104123442 B CN104123442 B CN 104123442B
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Abstract
A kind of online Equivalent Model of Wind turbines active power.The present invention discloses a kind of Wind turbines real power control on-time model, category technical field of electric automation, including wind energy conversion system model, shafting model, maximal power tracing Controlling model and self adaptation on-line parameter correcting module, wherein, wind energy conversion system model usage factor curve is modeled, shafting model uses single mass model, maximal power tracing Controlling model to be modeled with rotating speed cube curve using the stage power, and self adaptation on-line parameter correcting module utilizes online data correction model error.Model structure proposed by the invention is simple, it is adaptable to all kinds of Wind turbines types, and when network re-active power lexical analysis, relatively common model calculates more rapid, accurate.
Description
Technical field
The present invention relates to technical field of electric automation, in particular, it is related to Wind turbines active power equivalent online
Model modelling approach.
Background technology
The purpose of Wind turbines modeling is the characteristic that can relatively accurately reappear unit, is the injection of research wind-powered electricity generation and electric power
The interaction of system provides strong theoretical foundation and technical support.
Wind turbines modeling is broadly divided into physical model and Mathematical Modeling.Physical model is, according to similarity principle, to build
The equivalence model of original system, the dynamic characteristic of original physical system is reacted by testing；Mathematical Modeling is that original physical model is entered
Row is further abstract, obtains describing one group of state equation of original physical model, then simulates original by Digital computer simulation
The dynamic characteristic of system.Building physical model of equal value needs to expend substantial amounts of resource and expensive, if to physical system
In the case of not enough understanding, it is easy to cause the damage of system, be not suitable for testing repeatedly；With the hair at full speed of computer technology
Exhibition, Computing ability is greatly improved, and the advantage for carrying out Digital Simulation using structure Mathematical Modeling is more and more obvious, and its is main
Advantage is low input cost, can be tested repeatedly, and the precision for simulating real physical characteristics depends primarily on the detailed of Mathematical Modeling
Degree, flexibility is greatly improved.Therefore, the modeling to Wind turbines uses structure Mathematical Modeling, and enters line number on computers
Word is emulated.Shown in current most of unit models such as Fig. 1 (double-fed unit).But the complexity of wind generator system is high, and electric
Force system requires its rapidity for calculating when analyzing Wind turbines and wind power plant, it is therefore necessary to answered according to actual
Simplified accordingly with to model.Additionally, existing model does not consider damage of the machine group parts in During Process of Long-term Operation mostly
Consumption and state change, can so cause model truly to reflect the operation conditions of actual set.
The content of the invention
The present invention is directed to above-mentioned deficiency of the prior art, there is provided a kind of online Equivalent Model of Wind turbines active power
Modeling method.The model is transporting Wind turbines active power transfer process and its control individually modeling for actual set
The wind wheel abrasion occurred during row carries out on-line parameter amendment to model.
To reach above-mentioned purpose, the technical solution adopted in the present invention is as follows：
A kind of online Equivalent Model modeling method of Wind turbines active power, including wind energy conversion system model, shafting model are maximum
Power tracking Controlling model and self adaptation on-line parameter correcting module, wherein, the modeling of wind energy conversion system model usage factor curve, shafting
Model uses single mass model, maximal power tracing Controlling model to be modeled with rotating speed cube curve using the stage power,
Self adaptation on-line parameter correcting module utilizes online data correction model error.
Wind energy conversion system is modeled using power coefficient curve, can fully reflect unit input characteristics；Single mass shafting mould
Type have ignored shafting reverse etc. dynamic problem because this partial content not this model need emphatically consider, therefore, the equivalence
Model can save computing resource, improve calculating speed；Model adaptation on-line parameter correcting module can utilize online data amendment
Model error.
The abrasion of unit impeller and shafting in the process of running is considered, so as to the aerodynamic characteristic for causing wind wheel changes,
Line is modified to the parameter of model, wherein, self adaptation on-line parameter correcting module by obtaining the active power of actual set,
So as to obtain Cp value of the actual wind energy conversion system in the point, by the continuous online data for obtaining, corrected using least square method
The Cp curves of wind energy conversion system in model, so that the parameter tracking actual set change of model.
The present invention have ignored the labyrinth of set generator, remain the complete aerodynamic characteristic of unit, disclosure satisfy that
Model is simplified on the premise of power system active power scheduling requirement.Simultaneously, it is contemplated that actual set is long-term
Impeller may wear and tear in running, cause the aerodynamic characteristic of wind energy conversion system to change, and existing unit model does not have
On-line amending ability, the model for being proposed can be modified to the parameter in model online, model is accurately reacted all the time
The characteristic of actual set.
Difference with existing wind turbine model of the invention is that the present invention individually establishes unit active power model,
And situation of change of the unit partial parameters in actual moving process is considered, on-line amending is carried out to model parameter, realized
Model follows the working condition of actual set online, improves the precision and calculating speed of the scheduling of power system active power.
Brief description of the drawings
Fig. 1 is the model of the Wind turbines of prior art；
Fig. 2 is the online dynamic equivalent model of Wind turbines self adaptation provided by the present invention；
Fig. 3 is Cp curve on-line amending flow charts.
Specific embodiment
Embodiments of the invention are elaborated below, the present embodiment carries out reality premised on technical solution of the present invention
Apply, give detailed implementation method and specific operating process, but protection scope of the present invention is not limited to following embodiments.
Fig. 1 show the detailed model of double-fed wind power generator group, including wind energy conversion system model, multimass block shafting model,
Generator model, current transformer model etc..The behavior that this detailed model can reflect under wind energy conversion system various working, is used mostly in face
In research to double-fed unit model.But this model is complex, it is difficult quickly to be imitated during actual application on site
True result, cannot also reflect the change of unit state in use.
Fig. 2 show the proposed online active power Equivalent Model of simplified double-fed unit, and the model only remains double-fed
Wind power generating set active power conversion portion, eliminates the generator and converter structure of complexity, and can pass through on-line amending
Loss of the description unit wind wheel in application process.Model includes：1st, wind energy conversion system model, 2, shafting model, 3, peak power with
Track Controlling model and 4, self adaptation on-line parameter correcting module, wherein, the modeling of wind energy conversion system model usage factor curve, wherein CpGeneration
Table power coefficient, its size is determined by propeller pitch angle β and tip speed ratio λ；Shafting model uses single mass model, wherein ω
Represent generator speed, TmWith TeThe machine torque of wind energy conversion system offer and the electromagnetic torque of generator are provided respectively；Peak power with
Track Controlling model is modeled using the stage power with rotating speed cube curve, wherein PoptRepresent the optimal wattful power of unit output
Rate, it is directly proportional to the cube of generator speed ω, and proportionality coefficient is kopt, koptDetermined by unit parameter.Self adaptation is online
Parameters revision module utilizes online data correction model error.
The concrete principle of Equivalent Model of the present invention is：Simulated using simplified maximal power tracing instruction and limit power instruction
Control strategy of the unit in real process, for unit provides equivalent electromagnetic torque, wind wheel turns for unit provides input machinery
Square.On-line parameter correcting module can obtain the tip speed ratio of actual set by surveying generating unit speed, wind speed, so as to obtain the work
The power coefficient of point actual set, using power coefficient expression formula, can be continuously available unit in the process of running
The actual power coefficient of different operating point, using the power coefficient curve in least square on-line amending model, most
Enable that model wind wheel correctly reflects the working condition of actual set eventually.
Cp curves on-line amending flow of the present invention is as shown in Figure 3.Model can be obtained by the power instruction of unit model
Tip speed ratio, mode input wind speed, it is known that unit model rotating speed can be obtained, meanwhile, actual set uploads actual wind speed instrument and turns
Speed, power coefficient correction value, the wind wheel aerodynamic characteristic of real-time correction model can be obtained by modification method described previously.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned retouch
State and be not considered as limitation of the present invention.It is many for of the invention after those skilled in the art have read the above
Modifications and substitutions are planted all to will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (1)
1. the online Equivalent Model modeling method of a kind of Wind turbines active power, it is characterised in that including wind energy conversion system model, shafting
Model, maximal power tracing Controlling model and self adaptation on-line parameter correcting module, wherein, wind energy conversion system model usage factor curve
Modeling, shafting model uses single mass model, maximal power tracing Controlling model to use the maximal power tracing stage power
With the modeling of rotating speed cube curve, self adaptation on-line parameter correcting module utilizes online data correction model error, described adaptive
On-line parameter correcting module is answered by obtaining the active power of actual set, so as to obtain actual wind energy conversion system in the active power pair
The Cp values of the real work point answered, by the continuous online data for obtaining, using wind-force in least square method acquisition correction model
The Cp curves of machine, the parameter to model is modified online, so that the parameter tracking actual set of model changes, Cp represents wind
Can usage factor.
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Non-Patent Citations (4)
| Title |
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| "5 MW大型风力机气动特性计算及分析";刘强 等;《工程热物理学报》;20120731;第33卷(第7期);1155-1159 * |
| "变转速风力机整机性能研究及软件开发";杜明慧;《中国优秀博硕士学位论文全文数据库(硕士)-工程科技II辑》;20051115;第2005年卷(第7期);第3.3节 * |
| "基于PSCAD/EMTDC的双馈感应风电系统数学建模与仿真";顾静鸣 等;《华东电力》;20130630;第41卷(第6期);摘要,第1.1节，第1.2节，第1.5.1节，图2，图8-9 * |
| "基于运行数据的风力机建模与验证";苏勋文 等;《中国科技论文在线》;20110718;全文 * |
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