CN105680458B - A kind of photovoltaic plant is smoothly contributed method - Google Patents
A kind of photovoltaic plant is smoothly contributed method Download PDFInfo
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- CN105680458B CN105680458B CN201410657697.XA CN201410657697A CN105680458B CN 105680458 B CN105680458 B CN 105680458B CN 201410657697 A CN201410657697 A CN 201410657697A CN 105680458 B CN105680458 B CN 105680458B
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Abstract
The present invention provides a kind of photovoltaic plant and smoothly contributes method, including:Obtain the data acquisition system of predicting power of photovoltaic plant value composition;The data acquisition system is fitted using fitting of a polynomial algorithm, obtains desired smooth output formula;Desired smooth power generating value is calculated according to the desired smooth output formula;According to the desired smooth power generating value and the magnitude relationship of the predicting power of photovoltaic plant value, practical smooth power generating value is determined.The present invention to the predicting power of photovoltaic plant value for entirely planning output section by carrying out fitting of a polynomial, the practical smooth power curve finally obtained will not lag delay, compared to the method that photovoltaic plant power swing is stabilized using first-order low-pass wave method, the present invention has the smooth output effect more optimized.
Description
Technical field
The present invention relates to technical field of electric power, and in particular, to a kind of photovoltaic plant is smoothly contributed method.
Background technology
Photovoltaic generation is the current more ripe technology to be generated electricity using renewable and clean energy resource, but since solar energy provides
There is randomnesss and fluctuation in source, and a series of influence is brought to power grid.The fluctuation degree direct influence power grid of power is former
Some trend distributions, when the permeability of photovoltaic generation is in higher level, fluctuation and randomness can be to the operation bands of power grid
Carry out enormous impact.Fig. 1 is the system schematic of photovoltaic plant, and more photovoltaic generation units are connected on same busbar, then lead to jointly
Cross the access electric system of photovoltaic plant main transformer.In order to ensure injecting the electric energy held stationary of power grid, it is necessary to which photovoltaic is sent out
The fluctuation of electrical power is stabilized, to reduce influence of the photovoltaic generation power fluctuation to power grid.
Northeast Electric Power University's aerospace, Yan Gangui et al. realize what wind power fluctuation was stabilized using first-order low-pass wave algorithm
Control strategy.Mainly to wind power plant, running high fdrequency component filters out the control strategy, reduces the change rate of wind power,
Relatively stable power output is provided for electric system, and energy-storage system is then the width for changing output power by its charge and discharge
Value, the electric energy for making injection power grid are more steady.
Since solar energy and wind energy are the regenerative resources that have randomness and fluctuation, in technical field of electric power, this
Kind can also be applied to photovoltaic plant power using the control strategy that the progress wind power fluctuation of first-order low-pass wave algorithm is stabilized
During fluctuation is stabilized, i.e., photovoltaic plant power swing is stabilized using first-order low-pass wave algorithm.
But find that the output smoothing curve obtained using first-order low-pass wave algorithm has certain prolong in practical applications
Shi Zuoyong, as shown in Fig. 2, thinner line is the independent power curve of wind-powered electricity generation, thicker line is obtained using this control strategy
The smooth power curve of wind storing cogeneration, as ise apparent from FIG. 2, the smooth power curve of wind storing cogeneration lag behind wind-powered electricity generation list
Only power curve.This is because this realize that the control strategy that wind power fluctuation is stabilized is to adopt using first-order low-pass wave algorithm
It is weighted to obtain this filtering output value with this sampled value and last time filtering output value, specific formula is:
Y (n)=α X (n)+(1- α) Y (n-1)
In above formula, α is filter factor;X (n) is this sampled value;Y (n-1) is last time filtering output value;Y (n) is
This filtering output value.
As it can be seen that this realize that wind power fluctuates the control strategy also Shortcomings stabilized using first-order low-pass wave algorithm
Part.
Similarly, when being stabilized using first-order low-pass wave algorithm to photovoltaic plant power swing, also inevitably
There is the problem of obtained smooth power curve delay lag.
Invention content
The main purpose of the embodiment of the present invention is to provide a kind of photovoltaic plant and smoothly contributes method, to solve the prior art
The obtained smooth power curve of photovoltaic plant power swing, which is stabilized, using first-order low-pass wave algorithm there is asking for delay phenomenon
Topic.
To achieve these goals, the embodiment of the present invention provides a kind of photovoltaic plant and smoothly contributes method, including:
Step A obtains the data acquisition system of predicting power of photovoltaic plant value composition;
Step B is fitted the data acquisition system using fitting of a polynomial algorithm, obtains desired smooth output formula;
Step C calculates desired smooth power generating value according to the desired smooth output formula;
Step D according to the desired smooth power generating value and the magnitude relationship of the predicting power of photovoltaic plant value, is determined real
The smooth power generating value in border;
The step A is specially the data acquisition system P for obtaining predicting power of photovoltaic plant value composition:
P={ (pi,ti) | i=1,2..., m };
Wherein, P is data acquisition system, piFor predicting power of photovoltaic plant value, m is the number of samples and m of the data acquisition system
For natural number, i is sample sequence number, tiFor piThe corresponding time;
The step B is specifically included:
Step B1, according to predicting power of photovoltaic plant value p in the data acquisition system PiFluctuation tendency, determine the ideal
The exponent number n of smooth output formula, wherein n are natural number;
Step B2, multinomial of the fitting with the exponent number n:
anti n+an-1ti n-1+…+a1ti+a0;
Wherein, a0~anFor multinomial coefficient;
Step B3 calculates the multinomial anti n+an-1ti n-1+…+a1ti+a0With the predicting power of photovoltaic plant value pi
Squared difference and Err:
Step B4, when calculating the squared difference and Err as minimum value using least square method, multinomial coefficient a0~an
Corresponding occurrence α0~αn;
Step B5 utilizes the occurrence α0~αnBuild desired smooth output formula X (t):
X (t)=αntn+αn-1tn-1+…+α1t+α0;
Wherein, t is the time;
The step C is specially:
T=t is worked as in calculatingiWhen, the value X (t of the desired smooth output formula X (t)i):
X(ti)=αnti n+αn-1ti n-1+…+α1ti+α0
Wherein, X (ti) it is desired smooth power generating value;
The step D is specifically included:
When the desired smooth power generating value is less than or equal to the predicting power of photovoltaic plant value, determine that reality smoothly goes out
Force value is equal to the desired smooth power generating value;
When the desired smooth power generating value is more than the predicting power of photovoltaic plant value, practical smooth power generating value etc. is determined
In the predicting power of photovoltaic plant value.
By means of above-mentioned technical proposal, the present invention by entirely plan the predicting power of photovoltaic plant value in output section into
Row fitting of a polynomial, the actually smooth power curve finally obtained will not lag delay, compared to utilization first-order low-pass wave side
The method that method stabilizes photovoltaic plant power swing, the present invention have the smooth output effect more optimized.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, embodiment will be described below
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description be only the present invention some
Embodiment, for those of ordinary skill in the art, without creative efforts, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is the system schematic for the wind power plant that background of invention provides;
Fig. 2 is the work(carried out using first-order low-pass wave algorithm before and after wind-powered electricity generation fluctuation is stabilized that background of invention provides
Rate curve comparison schematic diagram;
Fig. 3 is that photovoltaic plant provided by the invention is smoothly contributed method flow schematic diagram;
Fig. 4 is the curve synoptic diagram of plan output section predicting power of photovoltaic plant value composition provided by the invention;
Fig. 5 is that the curve of plan output section predicting power of photovoltaic plant value composition provided by the invention goes out with desired smooth
Force curve contrast schematic diagram;
Fig. 6 is the smooth power curve of reality of corresponding diagram 5 provided by the invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
The present invention provides a kind of photovoltaic plant and smoothly contributes method, as shown in figure 3, this method includes:
Step S1 obtains the data acquisition system of predicting power of photovoltaic plant value composition.
Specifically, the step can obtain power prediction value from the power prediction system SCADA of photovoltaic plant, that is, obtain
The photovoltaic plant of SCADA predictions is in the output power value of plan output section (following a period of time).It is illustrated in figure 4 certain photovoltaic
Power station is in the curve of the predicting power of photovoltaic plant value composition in plan output section.
Step S2 is fitted data acquisition system using fitting of a polynomial algorithm, obtains desired smooth output formula.
Specifically, the step utilizes predicting power of photovoltaic plant Value Data of the fitting of a polynomial algorithm to plan output section
It is fitted, due to being calculated currently using adjacent filtering output value as existing utilization first-order low-pass wave algorithm
Filtering output value, therefore the obtained desired smooth power curve (i.e. the corresponding curve of desired smooth output formula) of the present invention is no
There can be delay phenomenon, smooth effect more optimizes.
Step S3 calculates desired smooth power generating value according to desired smooth output formula.
Step S4 according to desired smooth power generating value and the magnitude relationship of predicting power of photovoltaic plant value, is determined practical smooth
Power generating value.
Specifically, due under conditions of light inadequate resource, photovoltaic plant can not increase output, that is to say, that photovoltaic is inverse
The power for becoming device output only has downward tunable characteristic, and therefore, when ideal output is more than, photovoltaic plant is practical to contribute, i.e., preferable flat
When skidding off force value more than predicting power of photovoltaic plant value, with the practical output of photovoltaic plant, target generates electricity, that is, in fact in order to control
The smooth power generating value in border is equal to predicting power of photovoltaic plant value, discharges maximum power to power grid;And when preferable output is less than or equal to
When the available output of photovoltaic plant, i.e. desired smooth power generating value are less than or equal to predicting power of photovoltaic plant value, contributed with ideal
Target generates electricity in order to control, that is, practical smooth power generating value is equal to desired smooth power generating value.
The detailed process of above each step is illustrated below:
Step S1 is specially the data acquisition system P for obtaining predicting power of photovoltaic plant value composition:
P={ (pi,ti) | i=1,2..., m };
Wherein, P is data acquisition system, piFor predicting power of photovoltaic plant value, m is the number of samples of data acquisition system and m is certainly
So number, i be sample sequence number, tiFor piThe corresponding time.
Step S2 is specifically included:
Step S21, according to predicting power of photovoltaic plant value p in data acquisition system PiFluctuation tendency, determine that desired smooth goes out
The exponent number n of power formula, wherein n are natural number.
Preferably, step S21 can be specifically included:
According to predicting power of photovoltaic plant value p in data acquisition system PiFluctuation tendency, determine desired smooth power curve wave
Shape;
According to the desired smooth power curve waveform, the exponent number n of the desired smooth output formula is determined.
For example, when the desired smooth power curve waveform is straight line, the rank of the desired smooth output formula is determined
Number n=1;When the desired smooth power curve waveform is parabola, the exponent number n=of the desired smooth output formula is determined
2。
Step S22, multinomial of the fitting with exponent number n:
anti n+an-1ti n-1+…+a1ti+a0;
Wherein, a0~anFor multinomial coefficient.
Step S23, evaluator anti n+an-1ti n-1+…+a1ti+a0With predicting power of photovoltaic plant value piDifference put down
Side and Err:
Step S24, using least square method calculating difference quadratic sum Err be minimum value when, multinomial coefficient a0~anIt is corresponding
Occurrence α0~αn。
The mode of being calculated as below can be used in the step:
Respectively to multinomial coefficient a0~anPartial derivative is sought, obtains equation below group:
Above equation group is solved, obtains multinomial coefficient a0~anCorresponding occurrence α0~αn。
Step S25 utilizes occurrence α0~αnBuild desired smooth output formula X (t):
X (t)=αntn+αn-1tn-1+…+α1t+α0;
Wherein, t is the time.
Step S3 is specially:
T=t is worked as in calculatingiWhen, the value X (t of desired smooth output formula X (t)i):
X(ti)=αnti n+αn-1ti n-1+…+α1ti+α0
Wherein, X (ti) it is desired smooth power generating value.
Step S4 is specifically included:
As desired smooth power generating value X (ti) less than or equal to predicting power of photovoltaic plant value piWhen, determine practical smooth output
Value X (ti) ' be equal to desired smooth power generating value X (ti), that is, as X (ti)≤piWhen, X (ti) '=X (ti)。
As desired smooth power generating value X (ti) more than predicting power of photovoltaic plant value piWhen, determine practical smooth power generating value X
(ti) ' be equal to predicting power of photovoltaic plant value pi, that is, as X (ti)>piWhen, X (ti) '=pi。
Fig. 5 respectively illustrates the curve (shown in dotted line) and profit of plan output section predicting power of photovoltaic plant value composition
The desired smooth power curve (shown in solid) being calculated with method provided by the invention, by comparing it is found that desired smooth
Power curve reduces power swing, and there is no delay phenomenons.According to moment predicting power of photovoltaic plant value each in Fig. 5 and reason
Think the magnitude relationship of smooth power generating value, obtain the smooth power curve of reality shown in fig. 6.
Above specific embodiment has carried out further specifically the purpose of the present invention, technical solution and advantageous effect
It is bright, it should be understood that these are only specific embodiments of the present invention, the protection domain being not intended to limit the present invention,
All within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention's
Within protection domain.
Claims (4)
- A kind of method 1. photovoltaic plant is smoothly contributed, which is characterized in that including:Step A obtains the data acquisition system of predicting power of photovoltaic plant value composition;Step B is fitted the data acquisition system using fitting of a polynomial algorithm, obtains desired smooth output formula;Step C calculates desired smooth power generating value according to the desired smooth output formula;Step D according to the desired smooth power generating value and the magnitude relationship of the predicting power of photovoltaic plant value, is determined practical flat Skid off force value;The step A is specially the data acquisition system P for obtaining predicting power of photovoltaic plant value composition:P={ (pi,ti) | i=1,2..., m };Wherein, P is data acquisition system, piFor predicting power of photovoltaic plant value, m is the number of samples of the data acquisition system and m is nature Number, i be sample sequence number, tiFor piThe corresponding time;The step B is specifically included:Step B1, according to predicting power of photovoltaic plant value p in the data acquisition system PiFluctuation tendency, determine the desired smooth The exponent number n of output formula, wherein n are natural number;Step B2, multinomial of the fitting with the exponent number n:anti n+an-1ti n-1+…+a1ti+a0;Wherein, a0~anFor multinomial coefficient;Step B3 calculates the multinomial anti n+an-1ti n-1+…+a1ti+a0With the predicting power of photovoltaic plant value piDifference It is worth quadratic sum Err:Step B4, when calculating the squared difference and Err as minimum value using least square method, multinomial coefficient a0~anIt is corresponding Occurrence α0~αn;Step B5 utilizes the occurrence α0~αnBuild desired smooth output formula X (t):X (t)=αntn+αn-1tn-1+…+α1t+α0;Wherein, t is the time;The step C is specially:T=t is worked as in calculatingiWhen, the value X (t of the desired smooth output formula X (t)i):X(ti)=αnti n+αn-1ti n-1+…+α1ti+α0Wherein, X (ti) it is desired smooth power generating value;The step D is specifically included:When the desired smooth power generating value is less than or equal to the predicting power of photovoltaic plant value, practical smooth power generating value is determined Equal to the desired smooth power generating value;When the desired smooth power generating value is more than the predicting power of photovoltaic plant value, determine that practical smooth power generating value is equal to institute State predicting power of photovoltaic plant value;The step B4 is specifically included:Respectively to multinomial coefficient a0~anPartial derivative is sought, obtains equation below group:Above equation group is solved, obtains multinomial coefficient a0~anCorresponding occurrence α0~αn。
- 2. according to the method described in claim 1, it is characterized in that, the step B1 is specifically included:According to predicting power of photovoltaic plant value p in data acquisition system PiFluctuation tendency, determine desired smooth power curve waveform;According to the desired smooth power curve waveform, the exponent number n of the desired smooth output formula is determined.
- 3. according to the method described in claim 2, it is characterized in that, when the desired smooth power curve waveform be straight line when, Determine the exponent number n=1 of the desired smooth output formula.
- 4. according to the method described in claim 2, it is characterized in that, when the desired smooth power curve waveform is parabola When, determine the exponent number n=2 of the desired smooth output formula.
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US6310901B1 (en) * | 1998-06-03 | 2001-10-30 | Jds Uniphase Corporation | Automated AC filament universal laser power controller in a gas ion laser system and method |
CN102855385A (en) * | 2012-07-31 | 2013-01-02 | 上海交通大学 | Wind power generation short-period load forecasting method |
CN103489038A (en) * | 2013-09-09 | 2014-01-01 | 国家电网公司 | Photovoltaic ultra-short-term power prediction method based on LM-BP neural network |
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US6310901B1 (en) * | 1998-06-03 | 2001-10-30 | Jds Uniphase Corporation | Automated AC filament universal laser power controller in a gas ion laser system and method |
CN102855385A (en) * | 2012-07-31 | 2013-01-02 | 上海交通大学 | Wind power generation short-period load forecasting method |
CN103489038A (en) * | 2013-09-09 | 2014-01-01 | 国家电网公司 | Photovoltaic ultra-short-term power prediction method based on LM-BP neural network |
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