CN102288413B - Method for judging operation reliability of large-scale wind power generator set - Google Patents

Abstract

The invention relates to a method for judging the operation reliability of a large-scale wind power generator set, which comprises the following steps: 1, distributing strain foils on four specific points in the bottom cross section of a wind power generator tower frame crossed with the coordinate axis and measuring stress values of the four specific points during the operation of a wind power generator; 2, measuring the resultant force moment and the axial force; 3, measuring the intensity of the wind power generator set, giving the intensity requirements and referring to the formula (9); and 4, measuring the stable condition of the wind power generator set: 4.1, giving a first stable condition and referring to the formula (18); 4.2, giving a second stable condition and referring to the formula (20); 4.3, giving a third stable condition and referring to the formula (22); and 5, judging whether the formulas (9), (18), (20) and (22) are workable or not, if so, judging that the operation of the current wind power generator set is reliable, and if not, judging that the operation of the current wind power generator set is unreliable. The method provided by the invention can effectively realize the judgment of the operation reliability of the wind power generator set and is favorable for the safe and stable operation.

Description

A kind of method of judging the Large-scale Wind Turbines operational reliability

Technical field

The present invention relates to the decision method of wind power generating set operational reliability.

Background technology

Large-scale Wind Turbines is a kind of towering generating set, and bulky (tower top device weight is nearly all more than hundred tons), height are at tens of rice even more than hundred meters usually., because wind energy conversion system is stressed very complicated when the running status, be therefore that deviser, fabricator or user are with the very important technical indicator of wind energy conversion system reliability of operation as the check unit performance.Yet to its operational process carry out reliability monitoring be always the designer anxious to be resolved and rather the headache a problem.

Summary of the invention

, in order to overcome in prior art the decision method that lacks the wind power generating set operational reliability, the deficiency that is unfavorable for safe and stable operation, the invention provides a kind of judgement that can effectively realize the wind power generating set operational reliability, be conducive to the method for the judgement Large-scale Wind Turbines operational reliability of safe and stable operation.

The technical solution adopted for the present invention to solve the technical problems is:

A kind of method of judging the Large-scale Wind Turbines operational reliability said method comprising the steps of:

1) arrange foil gauge on 4 specified points that the X-axis of windmill tower frame bottom section and rectangular coordinate system and Y-axis intersect, the center of pylon bottom section is the initial point of rectangular coordinate system, and while recording the wind energy conversion system operation, the stress value of described 4 specified points is respectively σ ₁, σ ₂, σ ₃And σ ₄

2) resultant moment and axial force measuration:

The combined stress value that acts on pylon base circle xsect each specified point that X-axis and Y-axis with rectangular coordinate system intersect when wind power generating set is moved has following expression:

${\mathrm{\σ}}_1=-\frac{M\cos \mathrm{\α}}{W}-\frac{G}{A}---\left(1\right)$

${\mathrm{\σ}}_2=-\frac{M\sin \mathrm{\α}}{W}-\frac{G}{A}---\left(2\right)$

${\mathrm{\σ}}_3=\frac{M\cos \mathrm{\α}}{W}-\frac{G}{A}---\left(3\right)$

${\mathrm{\σ}}_4=\frac{M\sin \mathrm{\α}}{W}-\frac{G}{A}---\left(4\right)$

In formula, M acts on the resultant moment on the pylon cross section while being unit operation, and G represents axial force, and α is the angle between wind direction and pylon cross section X-axis, i.e. angle between resultant moment M and pylon cross section X-axis,

For the module of anti-bending section of core structure pylon annular cross section, wherein D is that external diameter, the d of xsect are the internal diameter of xsect, and A is the area of xsect;

Obtain after arrangement:

$M=\frac{W}{2}\sqrt{{({\mathrm{\σ}}_3-{\mathrm{\σ}}_1)}^2+{({\mathrm{\σ}}_4-{\mathrm{\σ}}_2)}^2}={\mathrm{\σ}}_{f1}\frac{W}{2}---\left(5\right)$

In formula: ${\mathrm{\&sigma;}}_{\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">f</figure-callout>}1}=\sqrt{{\left({\mathrm{\&sigma;}}_{3-{\mathrm{\&sigma;}}_1}\right)}^2+{({\mathrm{\&sigma;}}_4-{\mathrm{\&sigma;}}_2)}^2}$ Be defined as the stress function of bending of core structure pylon.

$G=-\frac{A}{4}({\mathrm{\&sigma;}}_1+{\mathrm{\&sigma;}}_2+{\mathrm{\&sigma;}}_3+{\mathrm{\&sigma;}}_4)={\mathrm{\&sigma;}}_{f2}\frac{A}{4}---\left(6\right)$

In formula: σ _f2=σ ₁+ σ ₂+ σ ₃+ σ ₄Be defined as the compressive stress function of core structure pylon.

3) measure the intensity of wind power generating set, provide requirement of strength, with reference to formula (9):

$|\&PlusMinus;\frac{{\mathrm{\&sigma;}}_{\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">f</figure-callout>}1}}{2}-\frac{{\mathrm{\&sigma;}}_{\mathrm{<figure-callout\; id="2"\; label="f"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">f</figure-callout>}2}}{4}|\&le;\left[\mathrm{\&sigma;}\right]---\left(9\right)$

Wherein, [σ] is the permissible stress of pylon material;

4) measure the stable condition of wind power generating set, comprise following three parts:

4.1) tower foundation of setting wind power generating set be that square is basic, the stabilizing moment M of wind power generating set _WExpression formula is:

$M_W=\frac{C(G+Q)}{2}---\left(17\right)$

Wherein, C is the length of side on the base on square basis, and Q is the deadweight on square basis, and G is the deadweight of unit, namely acts on the axial force on the pylon bottom section;

Provide the first stable condition, with reference to formula (18):

${\mathrm{\&sigma;}}_{\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">f</figure-callout>}1}\&le;\frac{C(G+Q)}{K_{1}W}---\left(18\right)$

Wherein, K ₁For safety coefficient;

4.2) provide the second stable condition, with reference to formula (20):

${\mathrm{\&sigma;}}_{\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">f</figure-callout>}1}\&le;\frac{C(G+Q)}{3K_{2}W}---\left(20\right)$

Wherein, K ₂For safety coefficient;

4.3) provide the 3rd stable condition, with reference to formula (22):

${\mathrm{\&sigma;}}_{\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">f</figure-callout>}1}\&le;\frac{\left[P\right]C^3-K_{3}C(G+Q)}{3K_{3}W}---\left(22\right)$

Wherein, [P] is the allowable bearing capacity power of soil, K ₃For safety coefficient,

Module of anti-bending section for the basic bottom surface of square;

5) judge conclusion: judge whether above-mentioned formula (9), (18), (20), (22) set up,, if set up, judge that current wind power generating set is reliable, otherwise, judge that current wind power generating set operation is unreliable.

Further, in described step 3), provide rigidity requirement, with reference to formula (15):

${\mathrm{\&sigma;}}_{\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">f</figure-callout>}1}\&le;\frac{6\left[f\right]{\mathrm{EI}}_d}{\mathrm{LW}}=\frac{3E{I}_d}{100W}---\left(15\right)$

Wherein, [f] expression license amount of deflection, L is the height of pylon, I _dFor the equivalent inertia moment of pylon structure, E is the elastic modulus of pylon material.

In described step 5), judge simultaneously whether formula (15) is set up,, if formula (9), (15), (18), (20), (22) are set up simultaneously, judge that current wind power generating set is reliable, otherwise, judge that current wind power generating set operation is unreliable.

Technical conceive of the present invention is: during the aerogenerator operation, unit bear deadweight except need and the moment of flexure that produces due to centre-of gravity shift, also need carry when capable the mechanical load that produces, wind load (comprise act on the normal pressure on wind wheel and act on cabin and pylon on wind load) etc. effect.Stress under the acting in conjunction of these load during unit operation as shown in Figure 1.In figure: P is wind load action produces on wind wheel normal pressure; G is unit deadweight (comprising wind wheel, cabin, pylon etc.); M _ZFor resultant bending moment (synthesizing of the moment of flexure that unit centre-of gravity shift produces and wind wheel moment of flexure); Q is for acting on wind load on cabin and pylon; A-A is the pylon tip section, and B-B is the pylon bottom section.

, according to the reliability requirement to wind energy conversion system, set up load that unit bears in required satisfied requirement of strength, rigidity requirement and stability requirement and some particular cross section of pylon under any operating mode and the relationship between the combined stress that respective point on this cross section produces.By the combined stress implementing monitoring of monitoring means to above-mentioned specified point, and it is controlled in allowed limits, just guarantee the reliability of wind power generating set.

Can be by the electrical measurement means, arrange foil gauge on 4 specified points that B-B cross section and coordinate axis intersect bottom windmill tower frame, the stress value of these specified points while recording the wind energy conversion system operation, utilize computing machine that it is strict controlled in a rational scope of above-mentioned relation formula, the wind energy conversion system operational reliability is implemented monitoring and controlled.To guarantee the safe operation of unit.

Beneficial effect of the present invention is mainly manifested in: can effectively realize the wind power generating set operational reliability judgement, be conducive to safe and stable operation.

Description of drawings

Fig. 1 is the stressed schematic diagram of wind power generating set.

Fig. 2 is the load schematic on tubular construction pylon cross section.

Fig. 3 is the schematic diagram on fixed basis.

Embodiment

The invention will be further described below in conjunction with accompanying drawing.

Embodiment 1

With reference to Fig. 2～Fig. 3, a kind of method of judging the Large-scale Wind Turbines operational reliability said method comprising the steps of:

1) arrange foil gauge on 4 specified points that the X-axis of windmill tower frame bottom section and rectangular coordinate system and Y-axis intersect, the center of pylon bottom section is the initial point of rectangular coordinate system, and while recording the wind energy conversion system operation, the stress value of described 4 specified points is respectively σ ₁, σ ₂, σ ₃And σ ₄

2) resultant moment and axial force measuration:

The pylon of large scale wind power machine, generally be cylindrical structure, and its xsect is an annulus.According to mechanical knowledge, we are not difficult to draw the load that acts on a certain cross section of pylon as shown in Figure 2.

Act on the resultant moment on the pylon cross section when in Fig. 2, M is unit operation, it is to be that unit deadweight, shearing H are synthetic by the wind load q that acts on the normal pressure P on wind wheel and act on unit by bias, wind wheel moment of flexure and the normal pressure P of unit deadweight G and comprehensive resultant moment, the axial force G that produces of the various factorss such as wind load q that act on unit.Because shearing H is much smaller than moment and axial force on the impact that unit reliability produces, therefore can ignore the impact of this factor when the reliability of wind energy conversion system is discussed.α is the angle (being the angle between resultant moment M and pylon cross section X-axis) between wind direction and pylon cross section X-axis.

Out-of-date when wind energy conversion system fortune, because wind-force and wind direction α may change at any time, the direction of resultant moment M and size are also along with changing.On tubular pylon annular cross section, the bending stress value of each point also changes.And gravity load G, in case after unit was shaped, its value was certain value.According to Fig. 2, can draw by mechanical knowledge the combined stress value that wind energy conversion system when operation act on the arbitrary annular cross section of pylon each specified point that X-axis and Y-axis with rectangular coordinate system intersect has following expression:

${\mathrm{\&sigma;}}_1=-\frac{M\cos \mathrm{\&alpha;}}{W}-\frac{G}{A}---\left(1\right)$

${\mathrm{\&sigma;}}_2=-\frac{M\sin \mathrm{\&alpha;}}{W}-\frac{G}{A}---\left(2\right)$

${\mathrm{\&sigma;}}_3=\frac{M\cos \mathrm{\&alpha;}}{W}-\frac{G}{A}---\left(3\right)$

${\mathrm{\&sigma;}}_4=\frac{M\sin \mathrm{\&alpha;}}{W}-\frac{G}{A}---\left(4\right)$

In formula: For the module of anti-bending section of core structure pylon annular cross section, wherein D is that external diameter, the d of xsect are the internal diameter of xsect, and A is the area of annular cross section;

Formula (3) is deducted formula (1), formula (4) deduct formula (2) then respectively square after addition evolution again, can obtain after arranging:

$M=\frac{W}{2}\sqrt{{({\mathrm{\&sigma;}}_3-{\mathrm{\&sigma;}}_1)}^2+{({\mathrm{\&sigma;}}_4-{\mathrm{\&sigma;}}_2)}^2}={\mathrm{\&sigma;}}_{f1}\frac{W}{2}---\left(5\right)$

In formula: ${\mathrm{\&sigma;}}_{\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">f</figure-callout>}1}=\sqrt{{\left({\mathrm{\&sigma;}}_{3-{\mathrm{\&sigma;}}_1}\right)}^2+{({\mathrm{\&sigma;}}_4-{\mathrm{\&sigma;}}_2)}^2}$ May be defined as the stress function of bending of core structure pylon.

, with formula (1), formula (2), formula (3), formula (4) addition, can obtain after arranging:

$G=-\frac{A}{4}({\mathrm{\&sigma;}}_1+{\mathrm{\&sigma;}}_2+{\mathrm{\&sigma;}}_3+{\mathrm{\&sigma;}}_4)={\mathrm{\&sigma;}}_{f2}\frac{A}{4}---\left(6\right)$

In formula: σ _f2=σ ₁+ σ ₂+ σ ₃+ σ ₄May be defined as the compressive stress function of core structure pylon.

In the present embodiment, the operational reliability of Large-scale Wind Turbines comprises two aspects, the i.e. requirement of strength of unit and stability requirement.

3) measure the intensity of wind power generating set

Aerogenerator (is shut down operating mode, is comprised the typhoon operating mode) its intensity and must meet design requirement under any operating condition and inoperative operating mode.Namely under the effect in combined load shown in Figure 2, the greatest combined stress σ that produces on any point of (as A-A pylon tip section, B-B pylon bottom section etc.) on the arbitrary cross section of pylon _MAXThe permissible stress [σ] that must be less than or equal to the pylon material.Namely

σ _MAX≤[σ] （7）

Annotate: pylon common used material Q345 permissible stress [σ] is 230MPa

By the mechanics of materials [1] knowledge as can be known, greatest combined stress σ _MAXBy bending stress σ _WWith draw compression stress ot _NForm.So can be rewritten into as follows with formula (7):

${\mathrm{\&sigma;}}_{\mathrm{MAX}}=|\&PlusMinus;{\mathrm{\&sigma;}}_W-{\mathrm{\&sigma;}}_N|=|\&PlusMinus;\frac{M}{W}-\frac{G}{A}|\&le;\left[\mathrm{\&sigma;}\right]---\left(8\right)$

With formula (5), formula (6) substitution formula (8), can obtain after arrangement, the requirement of strength that the wind power generating set safe operation need meet is:

$|\&PlusMinus;\frac{{\mathrm{\&sigma;}}_{\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">f</figure-callout>}1}}{2}-\frac{{\mathrm{\&sigma;}}_{\mathrm{<figure-callout\; id="2"\; label="f"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">f</figure-callout>}2}}{4}|\&le;\left[\mathrm{\&sigma;}\right]---\left(9\right)$

4) measure the stable condition of wind power generating set

Guarantee stablizing under any operating mode of wind power generating set, must meet simultaneously following three conditions.

1) one of stable condition be wind power generating set under any operating mode, the stabilizing moment M of himself _WMust be more than or equal to resultant moment (upsetting moment) M that is created in pylon bottom (B-B shown in Figure 1 cross section), that is:

M _W≥K ₁M （16）

In formula: K ₁For the safety coefficient greater than 1

The stabilizing moment M of unit self _WMainly the geometric configuration by unit deadweight, basis weight and basis is determined.Figure 3 shows that the fixed basis of wind power generating set and act on load on basis, in figure, G is that deadweight, the Q of unit are the length on square basic base for deadweight, the C on basis.We can draw the stabilizing moment M of unit according to Fig. 3 _WExpression formula is:

$M_W=\frac{C(G+Q)}{2}---\left(17\right)$

, with formula (5) and formula (17) substitution formula (16), can obtain after arrangement:

${\mathrm{\&sigma;}}_{\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">f</figure-callout>}1}\&le;\frac{C(G+Q)}{K_{1}W}---\left(18\right)$

2) two of stable condition be wind power generating set under any operating mode, the eccentric distance e of making a concerted effort to basis of the pressure that all load produce foundation bottom should not be too large, to guarantee basis, is unlikely to occur excessive inclination, its expression formula is:

$e=\frac{K_{2}M}{G+Q}\&le;\frac{C}{6}---\left(19\right)$

In formula: K ₂For the safety coefficient greater than 1

, with formula (5) substitution formula (19), can obtain after arrangement:

${\mathrm{\&sigma;}}_{\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">f</figure-callout>}1}\&le;\frac{C(G+Q)}{3K_{2}W}---\left(20\right)$

3) three of stable condition be wind power generating set under any operating mode, the maximum unit pressure that all load produce foundation bottom must not surpass the allowable bearing capacity power [P] of soil, its expression formula is:

$P_{\max }=K_3(\frac{G+\mathrm{<figure-callout\; id="2"\; label="Q\; C"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">Q</figure-callout>}}{C^{}}+\frac{M}{W_j})\&le;\left[P\right]---\left(21\right)$

In formula: K ₃For the safety coefficient greater than 1

Module of anti-bending section for the basic bottom surface of square

, with formula (5) substitution formula (21), can obtain after arrangement:

${\mathrm{\&sigma;}}_{\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">f</figure-callout>}1}\&le;\frac{\left[P\right]C^3-K_{3}C(G+Q)}{3K_{3}W}---\left(22\right)$

Annotate: for the safety coefficient K that provides in formula (18), formula (20) and formula (22) greater than 1 ₁, K ₂And K ₃Value, at present home and abroad there is no standards and norms in this respect.It is reasonable than power according to the situations such as soil texture value in 1.3～1.8 scope of geographic position, meteorological condition and the foundation bottom of wind energy conversion system installation that our experience is thought.

Can find out between the stress of some particular cross section of pylon (A-A cross section and B-B cross section) and wind energy conversion system operational reliability really have certain relation according to above analysis and the drawn relational expression (9) of deriving, (15), (18), (20) and (22).This will strictly control the wind energy conversion system operation by the above-mentioned relation formula just can guarantee the safe operation of unit.

Embodiment 2

With reference to Fig. 2 and Fig. 3, in the present embodiment, the operational reliability of Large-scale Wind Turbines comprises three aspects, the i.e. requirement of strength of unit, rigidity requirement and stability requirement.

In step 3), the rigidity of monitoring wind power generating set provides rigidity requirement:

Same aerogenerator (is shut down operating mode, is comprised the typhoon operating mode) its rigidity and must meet design requirement under any operating condition and inoperative operating mode.Namely under the effect in combined load shown in Figure 2, the maximum displacement f that tower top A-A cross section produces _MAXMust be less than or equal to license amount of deflection [f].Namely

f _MAX≤[f] (10)

Annotate: tower top Allowable deflection [f] is

By mechanics of materials knowledge as can be known, under combined load effect shown in Figure 1, the maximum displacement f that tower top A-A cross section produces _MAXFor:

$f_{\mathrm{MAX}}=\frac{\mathrm{<figure-callout\; id="3"\; label="p\; L"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">p</figure-callout>}{L}^{}{}^3}{{3\mathrm{EI}}_d}+\frac{{\mathrm{<figure-callout\; id="2"\; label="M\; Z\; L"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">M</figure-callout>}}_Z{L}^{}{}^2}{{2\mathrm{EI}}_d}+\frac{{\mathrm{<figure-callout\; id="4"\; label="qL"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">qL</figure-callout>}}^4}{8{\mathrm{EI}}_d}=\frac{{\mathrm{<figure-callout\; id="2"\; label="M\; P\; L"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">M</figure-callout>}}_P{L}^{}{}^2}{{3\mathrm{EI}}_d}+\frac{{\mathrm{<figure-callout\; id="2"\; label="M\; Z\; L"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">M</figure-callout>}}_Z{L}^{}{}^2}{{2\mathrm{EI}}_d}+\frac{{\mathrm{<figure-callout\; id="2"\; label="M\; q\; L"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">M</figure-callout>}}_q{L}^{}{}^2}{{4\mathrm{EI}}_d}---\left(11\right)$

In formula: L is the height of pylon, I _dFor the equivalent inertia moment of pylon structure, M _P, M _qRespectively transverse force, uniformly distributed load to tower at the bottom of the moment of flexure that produces of B-B cross section.

, with formula (11) substitution formula (10), can obtain after arrangement:

$\frac{{\mathrm{<figure-callout\; id="2"\; label="M\; P\; L"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">M</figure-callout>}}_P{L}^{}{}^2}{{3\mathrm{EI}}_d}+\frac{{\mathrm{<figure-callout\; id="2"\; label="M\; Z\; L"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">M</figure-callout>}}_Z{L}^{}{}^2}{{2\mathrm{EI}}_d}+\frac{{\mathrm{<figure-callout\; id="2"\; label="M\; q\; L"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">M</figure-callout>}}_q{L}^{}{}^2}{{4\mathrm{EI}}_d}\&le;\left[f\right]---\left(12\right)$

By mechanical knowledge as can be known, first of following formula produces amount of deflection for transverse force to tower top, and it plays a major role in whole amount of deflection; Second it is certain value for the resultant bending moment on tower top A-A cross section produces amount of deflection to tower top, it on tower at the bottom of the impact that produces of B-B cross section identical with the A-A cross section.Its role in whole amount of deflection is minimum; The 3rd produces amount of deflection for uniformly distributed load to tower top, and due to the relation of tubular pylon Shape Coefficient, its role in whole amount of deflection falls between.In sum, for making, calculate easyly, precision again can engineering demands, and we do following correction to following formula: 2 in second denominator is modified to 3, and the deflection value by second generation has reduced by 34% than initial value.In the 3rd denominator 4 is modified to 3, and the deflection value by the 3rd generation has increased by 32% than initial value.Due to the 3rd to the effect that tower top produced amount of deflection large than second, therefore above-mentioned simplification is all safety relatively to calculating and detecting.After above-mentioned correction, formula (12) can be rewritten into following formula.

$\frac{{\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">L</figure-callout>}}^2}{{3\mathrm{EI}}_d}(M_P+M_Z+M_q)\&le;\left[f\right]---\left(13\right)$

For B-B cross section at the bottom of tower, following expression is arranged:

M=M _P+M _Z+M _q (14)

, with formula (5) and formula (14) substitution formula (13), can obtain after arrangement:

${\mathrm{\&sigma;}}_{\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HDA0000062372310000012.png"\; state="\{\{state\}\}">f</figure-callout>}1}\&le;\frac{6\left[f\right]{\mathrm{EI}}_d}{\mathrm{LW}}=\frac{3{\mathrm{EI}}_d}{100W}---\left(15\right);$

In the present embodiment, need to judge simultaneously whether formula (15) is set up, if formula (15) is set up simultaneously, current wind power generating set is reliable, otherwise, judge that current wind power generating set operation is unreliable.

Other schemes of the present embodiment are all identical with embodiment 1.

Claims (2)

1. method of judging the Large-scale Wind Turbines operational reliability is characterized in that: said method comprising the steps of:

1) arrange foil gauge on 4 specified points that the X-axis of windmill tower frame bottom section and rectangular coordinate system and Y-axis intersect, the center of pylon bottom section is the initial point of rectangular coordinate system, and while recording the wind energy conversion system operation, the stress value of described 4 specified points is respectively σ ₁, σ ₂, σ ₃And σ ₄

2) expression formula of resultant moment and axial force:

The combined stress value that acts on the annular cross section of pylon bottom each specified point that X-axis and Y-axis with rectangular coordinate system intersect when wind power generating set is moved has following expression:

${\mathrm{\&sigma;}}_1=-\frac{M\cos \mathrm{\&alpha;}}{W}-\frac{G}{A}---\left(1\right)$

${\mathrm{\&sigma;}}_2=-\frac{M\sin \mathrm{\&alpha;}}{W}-\frac{G}{A}---\left(2\right)$

${\mathrm{\&sigma;}}_3=\frac{M\cos \mathrm{\&alpha;}}{W}-\frac{G}{A}---\left(3\right)$

${\mathrm{\&sigma;}}_4=\frac{M\sin \mathrm{\&alpha;}}{W}-\frac{G}{A}---\left(4\right)$

In formula, M acts on the resultant moment on the pylon cross section while being unit operation, and G is the deadweight of unit, namely acts on the axial force on the pylon bottom section, and α is the angle between wind direction and pylon cross section X-axis, i.e. angle between resultant moment M and pylon cross section X-axis,

For the module of anti-bending section of core structure pylon annular cross section, wherein D is that external diameter, the d of xsect are the internal diameter of xsect, and A is the area of xsect;

Obtain after arrangement:

$M=\frac{W}{2}\sqrt{{({\mathrm{\&sigma;}}_3-{\mathrm{\&sigma;}}_1)}^2+{({\mathrm{\&sigma;}}_4-{\mathrm{\&sigma;}}_2)}^2}={\mathrm{\&sigma;}}_{f1}\frac{W}{2}---\left(5\right)$

In formula: ${\mathrm{\&sigma;}}_{f1}=\sqrt{{\left({\mathrm{\&sigma;}}_{3-{\mathrm{\&sigma;}}_1}\right)}^2+{({\mathrm{\&sigma;}}_4-{\mathrm{\&sigma;}}_2)}^2}$ Be defined as the stress function of bending of core structure pylon,

$G=-\frac{1}{4}({\mathrm{\&sigma;}}_1+{\mathrm{\&sigma;}}_2+{\mathrm{\&sigma;}}_3+{\mathrm{\&sigma;}}_4)={\mathrm{\&sigma;}}_{f2}\frac{A}{4}---\left(6\right)$

In formula: ${\mathrm{\&sigma;}}_{f2}={\mathrm{\&sigma;}}_1+{\mathrm{\&sigma;}}_2+{\mathrm{\&sigma;}}_3+{\mathrm{\&sigma;}}_4$ Be defined as the compressive stress function of core structure pylon,

3) intensity of monitoring wind power generating set, provide requirement of strength, with reference to formula (9):

$|\&PlusMinus;\frac{{\mathrm{\&sigma;}}_{f1}}{2}-\frac{{\mathrm{\&sigma;}}_{f2}}{4}|\&le;\left[\mathrm{\&sigma;}\right]---\left(9\right)$

Wherein, [σ] is the permissible stress of pylon material;

4) stable condition of monitoring wind power generating set comprises following three parts:

4.1) tower foundation of setting wind power generating set be that square is basic, the stabilizing moment M of wind power generating set _WExpression formula is:

$M_W=\frac{C(G+Q)}{2}---\left(17\right)$

Wherein, C is the length of side on the base on square basis, and Q is the deadweight on square basis, and G is the deadweight of wind power generating set;

Provide the first stable condition, with reference to formula (18):

${\mathrm{\&sigma;}}_{f1}\&le;\frac{C(G+Q)}{K_{1}W}---\left(18\right)$

Wherein, K ₁For safety coefficient;

4.2) provide the second stable condition, with reference to formula (20):

${\mathrm{\&sigma;}}_{f1}\&le;\frac{C(G+Q)}{3K_{2}W}---\left(20\right)$

Wherein, K ₂For safety coefficient;

4.3) provide the 3rd stable condition, with reference to formula (22):

${\mathrm{\&sigma;}}_{f1}\&le;\frac{\left[P\right]C^3-K_{3}C(G+Q)}{3K_{3}W}---\left(22\right)$

Wherein, [P] is the allowable bearing capacity power of soil, K ₃For safety coefficient;

5) judge conclusion: judge whether above-mentioned formula (9), (18), (20), (22) set up,, if set up, judge that current wind power generating set is reliable, otherwise, judge that current wind power generating set operation is unreliable.

2. the method for judgement Large-scale Wind Turbines operational reliability as claimed in claim 1 is characterized in that: in described step 3), the rigidity of monitoring wind power generating set, provide rigidity requirement, with reference to formula (15):

${\mathrm{\&sigma;}}_{f1}\&le;\frac{6\left[f\right]{\mathrm{EI}}_d}{\mathrm{LW}}=\frac{3E{I}_d}{100W}---\left(15\right)$

Wherein, [f] expression license amount of deflection, L is the height of pylon, I _dFor the equivalent inertia moment of pylon structure, E is the elastic modulus of pylon material;

In described step 5), judge simultaneously whether formula (15) is set up,, if formula (9), (15), (18), (20), (22) are set up simultaneously, judge that current wind power generating set is reliable, otherwise, judge that current wind power generating set operation is unreliable.

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