CN105373858B - A kind of active power of wind power field optimization method decomposed based on wind speed timing - Google Patents

A kind of active power of wind power field optimization method decomposed based on wind speed timing Download PDF

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CN105373858B
CN105373858B CN201510843636.7A CN201510843636A CN105373858B CN 105373858 B CN105373858 B CN 105373858B CN 201510843636 A CN201510843636 A CN 201510843636A CN 105373858 B CN105373858 B CN 105373858B
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苏永新
李启航
段斌
易灵芝
谭貌
吴亚联
姚子力
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Abstract

The invention discloses a kind of active power of wind power field optimization methods decomposed based on wind speed timing, comprising the following steps: step 1: the forecasting wind speed Curve transform by wind power plant next control period is discrete wind series；Step 2: being considered as constant natural wind speed for the corresponding air speed value of discrete wind series each element, calculates separately under these constant natural wind speed effects, the active power reference value and its initial time of each unit；Step 3: by each unit active power reference value and its initial time, each unit active power reference value controlling curve under wind series effect is generated, each unit is run according to this controlling curve.The lower calculation amount of this optimization method, less hardware resource realize that active power of wind power field optimizes under Dynamic Wind Speed, and forming one kind has practical value scheme, promotes wind power plant generated energy, improves wind power plant gene-ration revenue.

Description

A kind of active power of wind power field optimization method decomposed based on wind speed timing
Technical field
The present invention relates to wind power plant control technology field, in particular to a kind of wind power plant decomposed based on wind speed timing is active Power optimization method.
Background technique
In recent years, the Wind Power Generation Industry in China remains strong growth, with the development of wind-powered electricity generation, there is good wind energy Land resources are fewer and fewer, further develop for support Wind Power Generation Industry, extensive development marine wind electric field becomes inexorable trend.When Preceding marine wind electric field construction cost is higher, improves the generating efficiency of marine wind electric field, increases the economic benefit of wind-powered electricity generation owner, is sea One of the critical issue of upper wind power plant operation.
Compared with landwid electric field, marine wind electric field is extremely violent by wake effect, and traditional separate unit Wind turbines are maximum Wind energy extraction will lead to upwind unit and absorb biggish wind energy, and lower wind direction unit input wind speed reduces, to lose wind power plant Active power, studies have shown that traditional single machine maximal wind-energy capture scheme, the marine wind electric field as caused by wake effect are active Power loss may be up to 30%, although wake effect can be effectively reduced by wind power plant microcosmic structure, Wind turbines layout optimization Influence, but due to the factors such as wind power plant place and construction cost restrict, the distance between Wind turbines are generally in impeller diameter 5 to 7 times between, influence of the wake effect to active power of wind power field is still obvious.
Domestic and international some scholars are based on wake effect and have carried out a series of researchs to active power of wind power field optimization, form A variety of wake models, existing research concentrate on substantially wind speed it is constant when, influence of the wake effect to active power of wind power field and its In terms of ameliorative way.But in wind speed dynamic change, the research of the active power optimization aspect of wind power plant is still immature, main The reason is that Wind turbines have it is very strong non-linear, by traditional method of thinking, using the wind speed of longer period of time as one Entirety is investigated, and active power of wind power field optimization method is established, and since the possibility combination of time dimension is extremely more, makes equation solution Computationally intensive, corresponding control strategy realizes difficulty, is unfavorable for practical application.
Summary of the invention
That in order to solve the above technical problem, the present invention provides a kind of calculation amounts is small, at low cost, practical value is high based on wind The active power of wind power field optimization method that fast timing is decomposed.
Technical proposal that the invention solves the above-mentioned problems is: a kind of active power of wind power field decomposed based on wind speed timing is excellent Change method, comprising the following steps:
Step 1: the forecasting wind speed curve in wind power plant next control period is chronologically converted into the discrete of 30 elements Wind series；
Step 2: being considered as constant natural wind speed for the corresponding air speed value of discrete wind series each element, is based on wake effect, It calculates separately under each constant natural wind speed effect, the active power reference value of each unit；Meanwhile it being based on wake flow propagation delay, It calculates separately under each constant natural wind speed effect, at the time of each unit active power reference value starts effect；
Step 3: by each unit active power reference value and its act at the time of, generate the effect of discrete wind series Under each unit active power reference value controlling curve, each unit according to this controlling curve run.
The above-mentioned active power of wind power field optimization method decomposed based on wind speed timing, in the step 1, discrete wind speed sequence Arrange the conversion formula of s (m) are as follows:
①
Wherein, m is natural number, and value range is 1≤m≤31, scIt (t) is t moment predicting wind speed of wind farm value, tNTable Show that the initial time in next control period, T indicate one control period corresponding duration of wind power plant, TsIt is between wind speed discretization Every the time, Ts=T/30.
The above-mentioned active power of wind power field optimization method decomposed based on wind speed timing, in the step 2, each unit has Steps are as follows for the calculating of function value and power reference:
1) with the axial inducible factor a of unit iiFor variable, then the power coefficient of unit iAnd its thrust coefficientAre as follows:
②
③
2) m in discrete wind series s (m) takes occurrence n, enables n=1；
3) it sets wind power plant to be acted on by constant natural wind speed s (n), uses viThe input wind speed for indicating unit i, if v1It is upwind Boundary unit, unit i+1 are the upward First units of unit i leeward, 4. 5. calculate the input wind speed of unit i+1 with formula by formula:
v1=s (n) is 4.
⑤
Wherein, k is wind power plant terrain rough factor, riFor unit i impeller radius, x is unit i hub centre and unit The distance that i+1 hub centre projects on wind direction；
4) each unit active power is calculated as follows:
⑥
Wherein, PiIndicate the active power of unit i, vratedIndicate unit rated wind speed, vin、vcutThe incision of expression unit, Cut-out wind speed；ρ indicates atmospheric density,Indicate the rated power of unit i；
5) it is as follows to establish active power of wind power field Optimized model:
⑦
Wherein, PallIndicate that active power of wind power field, i.e. the sum of each unit active power of wind power plant, N indicate machine in wind power plant Group sum,It indicates through optimization aiThe formula in bracket is set to obtain maximum value；
6) solution procedure 5) given by equation, obtain the optimization solution of unit i inducible factor, and substituted into formula 2.- 5. obtaining unit i power coefficient, thrust coefficient, the specific value for inputting wind speed；
7) by unit i power coefficient value substitute into following formula, then obtain natural wind speed be s (n) when, the wattful power of unit i Rate reference value
⑧
Make i value traverse each unit of wind power plant, then obtain natural wind speed be s (n) when, the active power reference of each unit Value；
8) judge that the value size of n enables n=n+1 if n≤30, jump to step 3), otherwise terminate operation.
The above-mentioned active power of wind power field optimization method decomposed based on wind speed timing, in the step 2, each unit has Calculation method at the time of function value and power reference starts effect is as follows: when the m in discrete wind series s (m) takes occurrence n, counting Calculate the time delay D that wind speed s (n) travels to unit i from wind power plant upwind boundary uniti,n, then when wind speed is s (n), unit i's has Function value and power referenceThe initiation momentFor
⑨。
The above-mentioned active power of wind power field optimization method decomposed based on wind speed timing, the active power reference value of each unit Start at the time of effect in calculation method, wind speed s (n) travels to the time delay D of unit i from wind power plant upwind boundary uniti,n's Calculation method is as follows:
1) wind is propagated by wind direction, on wind speed propagation path, seeks wind power plant upwind boundary unit impeller center and machine The distance of subpoint of the group i impeller center on wind direction, is denoted as L；
2) D is calculated as followsi,n, and i value is made to traverse each unit of wind power plant, n value traverses each nature in 1≤n≤31 Number,
⑩。
The above-mentioned active power of wind power field optimization method decomposed based on wind speed timing, in the step 3, unit wattful power The generating mode of rate reference value controlling curve is as follows: by i value, n value difference is identicalWithComposition control amount It is meant thatThe active power reference value at moment, unit i isIt, will to determining i valueValue by n by it is small to Longer spread,It arrivesBetween time, the active power reference value of unit i maintainsIt is constant, to obtain unit i Active power reference value controlling curve；I value is set to traverse each unit of wind power plant, m value traverses each natural number in 1≤m≤31, To obtain each unit active power reference value controlling curve of wind power plant.
The beneficial effects of the present invention are: the prediction of wind speed Curve transform in wind power plant next control period is by the present invention Discrete wind series calculate constant nature after the corresponding air speed value of discrete wind series each element is considered as constant natural wind speed Wind speed effect under each unit active power reference value and its start effect at the time of, and then generate wind series effect under each unit Active power reference value controlling curve, each unit are run according to this controlling curve；It is the lower calculation amount of this optimization method, less Hardware resource, realize that active power of wind power field optimizes under Dynamic Wind Speed, formed it is a kind of there is practical value scheme, promote wind-powered electricity generation Field generated energy, improves wind power plant gene-ration revenue.
Detailed description of the invention
Fig. 1 is general flow chart of the invention.
Fig. 2 is the flow chart of step 3 of the present invention.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
As shown in Figure 1, 2, the present invention the following steps are included:
Step 1: the forecasting wind speed curve in wind power plant next control period is chronologically converted into the discrete of 30 elements Wind series.
The conversion formula of discrete wind series s (m) are as follows:
①
Wherein, m is natural number, and value range is 1≤m≤31, scIt (t) is t moment predicting wind speed of wind farm value, tNTable Show that the initial time in next control period, T indicate one control period corresponding duration of wind power plant, TsIt is between wind speed discretization Every the time, Ts=T/30.
Step 2: being considered as constant natural wind speed for the corresponding air speed value of discrete wind series each element, is based on wake effect, It calculates separately under each constant natural wind speed effect, the active power reference value of each unit；Meanwhile it being based on wake flow propagation delay, It calculates separately under each constant natural wind speed effect, at the time of each unit active power reference value starts effect.
Steps are as follows for the calculating of the active power reference value of each unit:
1) with the axial inducible factor a of unit iiFor variable, then the power coefficient of unit iAnd its thrust coefficientAre as follows:
②
③
2) m in discrete wind series s (m) takes occurrence n, enables n=1；
3) it sets wind power plant to be acted on by constant natural wind speed s (n), uses viThe input wind speed for indicating unit i, if v1It is upwind Boundary unit, unit i+1 are the upward First units of unit i leeward, 4. 5. calculate the input wind speed of unit i+1 with formula by formula:
v1=s (n) is 4.
⑤
Wherein, k is wind power plant terrain rough factor, riFor unit i impeller radius, x is unit i hub centre and unit The distance that i+1 hub centre projects on wind direction；
4) each unit active power is calculated as follows:
⑥
Wherein, PiIndicate the active power of unit i, vratedIndicate unit rated wind speed, vin、vcutThe incision of expression unit, Cut-out wind speed；ρ indicates atmospheric density,Indicate the rated power of unit i；
5) it is as follows to establish active power of wind power field Optimized model:
⑦
Wherein, PallIndicate that active power of wind power field, i.e. the sum of each unit active power of wind power plant, N indicate machine in wind power plant Group sum,It indicates through optimization aiValue makes the formula in bracket obtain maximum value；
6) solution procedure 5) given by equation, obtain the optimization solution of unit i inducible factor, and substituted into formula 2.- 5. obtaining unit i power coefficient, thrust coefficient, the specific value for inputting wind speed；
7) by unit i power coefficient value substitute into following formula, then obtain natural wind speed be s (n) when, the wattful power of unit i Rate reference value
⑧
Make i value traverse each unit of wind power plant, then obtain natural wind speed be s (n) when, the active power reference of each unit Value；
8) judge that the value size of n enables n=n+1 if n≤30, jump to step 3), otherwise terminate the partial arithmetic.
It is as follows that the active power reference value of each unit starts calculation method at the time of effect:
When m in discrete wind series s (m) takes occurrence n, calculation of wind speed s (n) is passed from wind power plant upwind boundary unit It is multicast to the time delay D of unit ii,n, then when wind speed is s (n), the active power reference value of unit iThe initiation momentFor
⑨
Wind speed s (n) travels to the time delay D of unit i from wind power plant upwind boundary uniti,nCalculation method it is as follows:
1) wind is propagated by wind direction, on wind speed propagation path, seeks wind power plant upwind boundary unit impeller center and machine The distance of subpoint of the impeller center of group i on wind direction, is denoted as L；
2) D is calculated as followsi,n, and i value is made to traverse each unit of wind power plant, n value traverses each nature in 1≤n≤31 Number,
⑩
Step 3: by each unit active power reference value and its act on the moment, generate under the effect of discrete wind series Each unit active power reference value controlling curve, each unit are run according to this controlling curve.
The generation method of unit active power reference value controlling curve is as follows: by i value, n value difference is identicalWithGroup At control amountIt is meant thatThe active power reference value at moment, unit i isIt, will to determining i valueValue press the ascending arrangement of n,It arrivesBetween time, the active power reference value of unit i maintainsIt is constant, so that i value is traversed each unit of wind power plant, m value traverses each natural number in 1≤m≤31, to obtain wind-powered electricity generation Each unit active power reference value controlling curve in field.It can specifically carry out as follows:
1) if wind power plant unit sum is N, the bivariate table of three N rows 30 column is constructed, TableT is respectively designated as, TableP and TalblePandT；
2) the possibility value of i and n is traversed, it willFill out the i-th row n-th column in TableT；
3) the possibility value of i and n is traversed, it willFill out the i-th row n-th column in TableP；
4) i-th the n-th column element of row of TableT and i-th the n-th column element of row of TableP are complex asAnd by its Write on the i-th row n-th column of TalblePandT；
5) using the time as abscissa, active power reference value is that ordinate constitutes coordinate system, takes the i-th of TalblePandT Row data, by row number, sequence is successively fetched evidence from small to large, and is demarcated on coordinate system each Point, also, It arrivesBetween time, the active power reference value of unit i is maintainedIt is constant, to obtain the wattful power of unit i Rate reference value controlling curve；All possible values of i traversal, repeat the step, obtain the next control period active power of each unit Reference value controlling curve.

Claims (6)

1. a kind of active power of wind power field optimization method decomposed based on wind speed timing, comprising the following steps:
Step 1: the forecasting wind speed curve in wind power plant next control period is chronologically converted to the discrete wind speed of 30 elements Sequence；
Step 2: being considered as constant natural wind speed for the corresponding air speed value of discrete wind series each element, is based on wake effect, respectively It calculates under each constant natural wind speed effect, the active power reference value of each unit；Meanwhile it being based on wake flow propagation delay, respectively It calculates under each constant natural wind speed effect, at the time of each unit active power reference value starts effect；
Step 3: by each unit active power reference value and its act at the time of, generate each under the effect of discrete wind series Unit active power reference value controlling curve, each unit are run according to this controlling curve.
2. the active power of wind power field optimization method according to claim 1 decomposed based on wind speed timing, it is characterised in that: In the step 1, the conversion formula of discrete wind series s (m) are as follows:
①
Wherein, m is natural number, and value range is 1≤m≤31, scIt (t) is t moment predicting wind speed of wind farm value, tNUnder expression The initial time in one control period, T indicate one control period corresponding duration of wind power plant, TsWhen being wind speed discretization interval Between, Ts=T/30.
3. the active power of wind power field optimization method according to claim 2 decomposed based on wind speed timing, it is characterised in that: In the step 2, steps are as follows for the calculating of the active power reference value of each unit:
1) with the axial inducible factor a of unit iiFor variable, then the power coefficient of unit iAnd its thrust coefficientAre as follows:
②
③
2) m in discrete wind series s (m) takes occurrence n, enables n=1；
3) it sets wind power plant to be acted on by constant natural wind speed s (n), uses viThe input wind speed for indicating unit i, if v1It is upwind boundary Unit, unit i+1 are the upward First units of unit i leeward, 4. 5. calculate the input wind speed of unit i+1 with formula by formula:
v1=s (n) is 4.
⑤
Wherein, k is wind power plant terrain rough factor, riFor unit i impeller radius, x is that unit i hub centre and unit i+1 take turns The distance that hub center projects on wind direction；
4) each unit active power is calculated as follows:
⑥
Wherein, PiIndicate the active power of unit i, vratedIndicate unit rated wind speed, vin、vcutIt indicates the incision of unit, cut out Wind speed；ρ indicates atmospheric density,Indicate the rated power of unit i；
5) it is as follows to establish active power of wind power field Optimized model:
s.t.
v1=s (n)
⑦
Wherein, PallIndicate that active power of wind power field, i.e. the sum of each unit active power of wind power plant, N indicate that unit is total in wind power plant Number,It indicates through optimization aiThe formula in bracket is set to obtain maximum value；
6) solution procedure 5) given by equation, obtain the optimization solution of unit i inducible factor, and substituted into formula 2. -5., obtain Unit i power coefficient, thrust coefficient, the specific value for inputting wind speed out；
7) by unit i power coefficient value substitute into following formula, then obtain natural wind speed be s (n) when, unit i active power ginseng Examine value
⑧
Make i value traverse each unit of wind power plant, then obtain natural wind speed be s (n) when, the active power reference value of each unit；
8) judge that the value size of n enables n=n+1 if n≤30, jump to step 3), otherwise terminate operation.
4. the active power of wind power field optimization method according to claim 3 decomposed based on wind speed timing, it is characterised in that: In the step 2, the calculation method that the active power reference value of each unit starts at the time of acting on is as follows: discrete wind series s (m) when the m in takes occurrence n, calculation of wind speed s (n) travels to the time delay D of unit i from wind power plant upwind boundary uniti,n, then When wind speed is s (n), the active power reference value of unit iThe initiation momentFor
⑨。
5. the active power of wind power field optimization method according to claim 4 decomposed based on wind speed timing, it is characterised in that: The active power reference value of each unit starts at the time of effect in calculation method, and wind speed s (n) is from wind power plant upwind boundary machine Group travels to the time delay D of unit ii,nCalculation method it is as follows:
1) wind is propagated by wind direction, on wind speed propagation path, seeks wind power plant upwind boundary unit impeller center and unit i leaf The distance of subpoint of the wheel center on wind direction, is denoted as L；
2) D is calculated as followsi,n, and i value is made to traverse each unit of wind power plant, n value traverses each natural number in 1≤n≤31,
⑩。
6. the active power of wind power field optimization method according to claim 5 decomposed based on wind speed timing, it is characterised in that: In the step 3, the generating mode of unit active power reference value controlling curve is as follows: by i value, n value difference is identical WithComposition control amountIt is meant thatThe active power reference value at moment, unit i isTo determining i Value, willValue press the ascending arrangement of n,It arrivesBetween time, the active power reference value of unit i maintainsIt is constant, to obtain the active power reference value controlling curve of unit i；I value is set to traverse each unit of wind power plant, m takes Each natural number in value traversal 1≤m≤31, to obtain each unit active power reference value controlling curve of wind power plant.
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CN103745024A (en) * 2013-11-26 2014-04-23 沈阳工业大学 Power characteristic evaluation method for correcting tail wind speed of wind turbine generator based on three-dimensional wake flow model
CN103942608A (en) * 2014-03-28 2014-07-23 华北电力大学 Optimized dispatching method for wind power farm based wake flow models
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