CN103345582B - The asynchronous wind energy conversion system modeling method of fixed pitch - Google Patents

Abstract

The invention discloses the asynchronous wind energy conversion system modeling method of a kind of fixed pitch, comprise the following steps: step one: set up wind turbine generator capture power equation; Step 2: set up wind speed change tread process equation; Step 3: the power transfer characteristic of matching Wind turbines; Step 4: set up wind energy transmittance process Delay Equations; Step 5: use the power transfer characteristic of above-mentioned wind turbine generator capture power equation, wind speed change tread process equation, Wind turbines and wind energy transmittance process Delay Equations to complete the asynchronous wind energy conversion system modeling of fixed pitch.The asynchronous wind energy conversion system model of fixed pitch is set up in realization, for Power System Stability Analysis and electrical network production scheduling provide the advantage of accurate data.

Description

The asynchronous wind energy conversion system modeling method of fixed pitch

Technical field

The present invention relates to wind-force electric discharge field, particularly, relate to the asynchronous wind energy conversion system modeling method of a kind of fixed pitch.

Background technology

The large-scale wind electricity base majority that China's wind-powered electricity generation produces after entering the large-scale development stage is positioned at " three northern areas of China " (northwest, northeast, North China); large-scale wind electricity base is generally away from load center, and its electric power needs to be transported to load center to dissolve through long-distance, high voltage.Due to the intermittence of wind-resources, randomness and undulatory property, cause the fluctuation that the wind power output of large-scale wind power base can occur in a big way thereupon, cause the fluctuation of power transmission network charge power further, bring series of problems to safe operation of electric network.

Therefore, need to carry out modeling to wind energy conversion system, thus Wind turbines and wind energy turbine set model can be set up, and the model parameter of Wind turbines and wind energy turbine set is verified, for Power System Stability Analysis and electrical network production scheduling provide basis accurately, for the exploitation of Wind turbines and wind farm grid-connected access or operation control new technology provides basic data.But also there is no the modeling method of the asynchronous wind energy conversion system model of fixed pitch, the asynchronous wind energy conversion system model of a kind of fixed pitch can be provided for providing data basis for Power System Stability Analysis and electrical network production scheduling.

Summary of the invention

The object of the invention is to, for the problems referred to above, propose the asynchronous wind energy conversion system modeling method of a kind of fixed pitch, to realize setting up the asynchronous wind energy conversion system model of fixed pitch, for Power System Stability Analysis and electrical network production scheduling provide the advantage of accurate data.

For achieving the above object, the technical solution used in the present invention is:

The asynchronous wind energy conversion system modeling method of a kind of fixed pitch, comprises the following steps:

Step one: set up wind turbine generator capture power equation, formula is specific as follows:

Wherein, P _wbe wind energy power, ρ is atmospheric density, A _rthe inswept area of blade, V _wwind speed, C _pbe wind energy conversion system power coefficient, λ is Axis Wind Turbine With A Tip Vane speed ratio, and θ is wind energy conversion system propeller pitch angle;

Step 2: set up wind speed change tread process equation, formula is specific as follows:

In formula, for wind energy conversion system output rating, , , be respectively the incision wind speed of wind energy conversion system, cut-out wind speed and wind rating;

Step 3: the power transfer characteristic of matching Wind turbines, above-mentioned function C _p'scomputing formula is specific as follows:

In formula, a _ifor correction factor;

Step 4: set up wind energy transmittance process Delay Equations, because the blade of blower fan and wheel firmly have larger moment of inertia, wind energy is delivered to generator acting from blade has certain time lag by wheel is firm, simulates Delay Equations, that is: with first order inertial loop

In formula, P _mfor the mechanical output in asynchronous generator rotating shaft, τ _hfor the inertia time constant of wheel hub;

Step 5: use the power transfer characteristic of above-mentioned wind turbine generator capture power equation, wind speed change tread process equation, Wind turbines and wind energy transmittance process Delay Equations to complete the asynchronous wind energy conversion system modeling of fixed pitch.

Technical scheme of the present invention has following beneficial effect:

Technical scheme of the present invention, by setting up wind turbine generator capture power equation, wind speed change tread process equation, the power transfer characteristic of Wind turbines and wind energy transmittance process Delay Equations, thus complete the asynchronous wind energy conversion system modeling of fixed pitch, reach as Power System Stability Analysis and electrical network production scheduling provide the object of accurate data.

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

Accompanying drawing explanation

Fig. 1 is the asynchronous wind energy conversion system modeling method of the fixed pitch described in embodiment of the present invention schematic diagram;

Fig. 2 is fixed pitch Wind turbines Cp curve map in the asynchronous wind energy conversion system modeling method of the fixed pitch described in the embodiment of the present invention;

Fig. 3 is for adopting the comparison diagram of fixed pitch asynchronous wind energy conversion system modeling method matched curve described in the embodiment of the present invention and actual curve.

Wherein: 1 is actual curve figure, 2 is the curve map of technical solution of the present invention matching.

Embodiment

Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.

As shown in Figure 1, the asynchronous wind energy conversion system modeling method of a kind of fixed pitch, comprises the following steps:

Step 101: set up wind turbine generator capture power equation, formula is specific as follows:

Wherein, P _wbe wind energy power, ρ is atmospheric density, A _rthe inswept area of blade, V _wwind speed, C _pbe wind energy conversion system power coefficient, λ is Axis Wind Turbine With A Tip Vane speed ratio, and θ is wind energy conversion system propeller pitch angle;

Step 102: set up wind speed change tread process equation, formula is specific as follows:

In formula, for wind energy conversion system output rating, , , be respectively the incision wind speed of wind energy conversion system, cut-out wind speed and wind rating;

Step 103: the power transfer characteristic of matching Wind turbines, above-mentioned function C _p'scomputing formula is specific as follows:

In formula, a _ifor correction factor;

Step 104: set up wind energy transmittance process Delay Equations, because the blade of blower fan and wheel firmly have larger moment of inertia, wind energy is delivered to generator acting from blade has certain time lag by wheel is firm, simulates Delay Equations, that is: with first order inertial loop

In formula, P _mfor the mechanical output in asynchronous generator rotating shaft, τ _hfor the inertia time constant of wheel hub;

Step 105: use the power transfer characteristic of above-mentioned wind turbine generator capture power equation, wind speed change tread process equation, Wind turbines and wind energy transmittance process Delay Equations to complete the asynchronous wind energy conversion system modeling of fixed pitch.

Wherein in step 101, wind energy conversion system power coefficient C _pbe the function of Axis Wind Turbine With A Tip Vane speed ratio λ (ratio of wind wheel tip speed and wind speed) and wind energy conversion system propeller pitch angle θ, fixed pitch Wind turbines propeller pitch angle θ immobilizes, therefore, and C _ponly relevant with tip speed ratio λ, as shown in Figure 2.

Have Fig. 3 known in the working range of Wind turbines, technical scheme of the present invention has good simulate effect.

Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (1)

1. the asynchronous wind energy conversion system modeling method of fixed pitch, is characterized in that, comprise the following steps:

Step one: set up wind turbine generator capture power equation, formula is specific as follows:

$P_w=\frac{\mathrm{\ρ}}{2}{A}_r{V}_w^3{C}_p(\mathrm{\λ},\mathrm{\θ})$

Wherein, P _wbe wind energy power, ρ is atmospheric density, A _rthe inswept area of blade, V _wwind speed, C _pbe wind energy conversion system power coefficient, λ is Axis Wind Turbine With A Tip Vane speed ratio, and θ is wind energy conversion system propeller pitch angle;

Step 2: set up wind speed change tread process equation, formula is specific as follows:

$P_w=\left\{\begin{array}{cc}0& V_w<V_{ci}\\ \frac{V_w^3-V_{ci}^3}{V_r^3-V_{ci}^3}{P}_r& V_{ci}\&le;V_w<V_r\\ P_r& V_r\&le;V_w<V_{co}\\ 0& V_{co}\&le;V_w\end{array}\right.$

In formula, P _rfor wind energy conversion system output rating, V _ci, V _co, V _rbe respectively the incision wind speed of wind energy conversion system, cut-out wind speed and wind rating;

Step 3: the power transfer characteristic of matching Wind turbines, above-mentioned function C _pcomputing formula specific as follows:

$C_p=\underset{i=0}{\overset{6}{\&Sigma;}}{\mathrm{\&alpha;}}_i{\mathrm{\&lambda;}}^i$

In formula, a _ifor correction factor;

Step 4: set up wind energy transmittance process Delay Equations, because the blade of blower fan and wheel firmly have larger moment of inertia, wind energy is delivered to generator acting from blade has certain time lag by wheel is firm, simulates Delay Equations, that is: with first order inertial loop

$\frac{{\mathrm{dP}}_m}{d_t}=\frac{1}{{\mathrm{\&tau;}}_h}(P_w-P_m)$

In formula, P _mfor the mechanical output in asynchronous generator rotating shaft, τ _hfor the inertia time constant of wheel hub;

Step 5: use the power transfer characteristic of above-mentioned wind turbine generator capture power equation, wind speed change tread process equation, Wind turbines and wind energy transmittance process Delay Equations to complete the asynchronous wind energy conversion system modeling of fixed pitch.