CN109787260A - A kind of energy storage system control method and system of the photovoltaic power generation short-term fluctuation of smooth distribution formula - Google Patents
A kind of energy storage system control method and system of the photovoltaic power generation short-term fluctuation of smooth distribution formula Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention discloses the energy storage system control methods and system of a kind of smooth distribution formula photovoltaic power generation short-term fluctuation, comprising: calculates the photovoltaic generation power undulate quantity at current time；At current time, the generated output of the photovoltaic power generation of each prediction time in preset time period is predicted, and calculates separately the photovoltaic generation power undulate quantity of the prediction of two neighboring prediction time；Whether the photovoltaic generation power undulate quantity of the photovoltaic generation power undulate quantity and prediction that judge current time is more than preset prescribed limits, to obtain judging result；The calculation of corresponding energy-storage system output power is determined according to the judging result, and determines the output power of energy-storage system according to the calculation of fixed energy-storage system output power, with smooth distribution formula photovoltaic power generation short-term fluctuation.The present invention, which can roll, is adjusted the state-of-charge of energy-storage battery, and then alleviates the problem of energy-storage battery regulating power deficiency, reduces the out-of-limit probability of photovoltaic power generation.
Description
Technical field
The present invention relates to distribution network technical fields, and more particularly, to a kind of smooth distribution formula photovoltaic power generation
The energy storage system control method and system of short-term fluctuation.
Background technique
In the power system, distributed photovoltaic have many advantages, such as to be easy to on-site elimination, limited by place it is smaller.But photovoltaic is sent out
Electricity is affected by weather, and there may be biggish power swings, the especially same region to match for photovoltaic power generation in a short time
The weather conditions of power grid are close, and the synergistic effect of a large amount of distributed photovoltaic power generation short-time fluctuations can cause greater impact to power grid.
Therefore, it is necessary to a kind of energy storage system control methods of smooth distribution formula photovoltaic power generation short-term fluctuation, utilize energy storage system
System is controlled, the problem of with smooth distribution formula photovoltaic power generation short-term fluctuation.
Summary of the invention
The present invention proposes the energy storage system control method and system of a kind of smooth distribution formula photovoltaic power generation short-term fluctuation, with solution
Certainly how energy-storage system is controlled, the problem of with smooth distribution formula photovoltaic power generation short-term fluctuation.
To solve the above-mentioned problems, according to an aspect of the invention, there is provided a kind of smooth distribution formula photovoltaic power generation is short
The energy storage system control method of phase fluctuation, which is characterized in that the described method includes:
The photovoltaic generation power undulate quantity at current time is calculated using photovoltaic generation power undulate quantity calculation formula；
At current time, the generated output of the photovoltaic power generation of each prediction time in preset time period is predicted,
And the photovoltaic power generation of the prediction of two neighboring prediction time is calculated separately using the photovoltaic generation power undulate quantity calculation formula
Power waves momentum；
Whether the photovoltaic generation power undulate quantity of the photovoltaic generation power undulate quantity and prediction that judge current time is more than pre-
If prescribed limits, to obtain judging result；
The calculation of corresponding energy-storage system output power is determined according to the judging result, and according to fixed storage
The calculation of energy system output power determines the output power of energy-storage system, with smooth distribution formula photovoltaic power generation short-term fluctuation.
Preferably, wherein the photovoltaic generation power undulate quantity calculation formula are as follows:
Pflu=Ppv(t)-Ppv(t-1),
Wherein, PfluFor the photovoltaic generation power undulate quantity of t moment；PpvIt (t) is output power of the photovoltaic system in t moment；
PpvIt (t-1) is output power of the photovoltaic system at the t-1 moment.
Preferably, wherein the photovoltaic generation power wave of the photovoltaic generation power undulate quantity at the judgement current time and prediction
Whether momentum is more than preset prescribed limits, comprising:
Judge whether the photovoltaic generation power undulate quantity at current time is more than or equal to the upper limit of photovoltaic power generation fluctuation limit value；
Judge whether the photovoltaic generation power undulate quantity at current time is less than or equal to the lower limit of photovoltaic power generation fluctuation limit value；With
And
It is greater than the lower limit of photovoltaic power generation fluctuation limit value in the photovoltaic generation power undulate quantity at current time and is less than photovoltaic
When the upper limit of generated output undulate quantity, judge in the photovoltaic generation power undulate quantity of the prediction with the presence or absence of more than photovoltaic power generation
Fluctuate the photovoltaic power generation function power waves momentum of limit value.
Preferably, wherein the calculation for determining corresponding energy-storage system output power according to the judging result,
Include:
When the photovoltaic generation power undulate quantity at judging result instruction current time is more than or equal to photovoltaic power generation fluctuation limit
When the upper limit of value, the calculation of corresponding energy-storage system output power is determined are as follows:
Pe(t)=min (Pflu-Pfmax,PEmax),
When the photovoltaic generation power undulate quantity at judging result instruction current time is less than or equal to photovoltaic power generation fluctuation limit
When the lower limit of value, the calculation of corresponding energy-storage system output power is determined are as follows:
Pe(t)=min (| Pflu-Pfmax|,PEmax),
It is more than photovoltaic power generation when whether there is in the photovoltaic generation power undulate quantity that the judging result indicates judgement prediction
When fluctuating the photovoltaic power generation function power waves momentum of limit value, the calculation of corresponding energy-storage system output power is determined are as follows:
The output power of energy-storage system is determined according to the state of charge of energy-storage system and energy storage prediction action state；
Wherein, PeIt (t) is the energy-storage system output power of current time t moment；PfluFor the photovoltaic generation power of t moment
Undulate quantity；PfmaxWith-PfmaxThe respectively upper and lower bound of photovoltaic power generation fluctuation limit value；PemaxWith-PemaxRespectively energy-storage system
The upper and lower bound of output power limit value.
Preferably, wherein described determine energy-storage system according to the state of charge and energy storage prediction action state of energy-storage system
Output power, comprising:
As SOC (t) > SOCup, and S1=1 or S2When=1, energy-storage system output power is determined are as follows:
Pe(t)=min ((SOC (t)-SOCup)Ee/ Δ t, PEmax),
As SOC (t) > SOCup, and S1=0 or S2When=1, energy-storage system output power is determined are as follows:
Pe(t)=min ((SOClow-SOC(t))Ee/Δt,PEmax),
In the case of other, determine that energy-storage system output power is 0；
Wherein, SOC (t) is the state of charge of t moment energy-storage system；SOCupAnd SOClowThe respectively lotus of energy-storage system
The upper and lower bound of electricity condition limit value；EeFor energy storage system capacity；Δ t time interval；S1And S2For energy storage prediction action state；
S1State value at the time of needing energy-storage system charge or discharge for first in predetermined period T；S2For in entire predetermined period T
State value at the time of energy-storage system charge or discharge；PEmaxFor the upper limit of energy-storage system output power limit value.
Preferably, wherein the method also includes:
If the photovoltaic power generation undulate quantity in entire preset time period containing prediction time has been more than photovoltaic power generation fluctuation limit
Value, i.e. some prediction time t in preset time periodiPhotovoltaic power generation undulate quantity be first more limit value, and be more than photovoltaic
The upper limit P of power generation fluctuation limit valuefmax, it is determined that S1=1；If being more than the lower limit-P of photovoltaic power generation fluctuation limit valuefmax, it is determined that
S1=0；
If the photovoltaic power generation undulate quantity of all prediction times is less than photovoltaic power generation fluctuation in entire preset time period
Limit value, i.e. energy-storage system are failure to actuate, it is determined that S2=1.
According to another aspect of the present invention, a kind of energy-storage system of smooth distribution formula photovoltaic power generation short-term fluctuation is provided
Control system, which is characterized in that the system comprises:
Current time photovoltaic generation power undulate quantity computing unit, for utilizing photovoltaic generation power undulate quantity calculation formula
Calculate the photovoltaic generation power undulate quantity at current time；
The photovoltaic generation power undulate quantity computing unit of prediction is used at current time, to each of in preset time period
The generated output of the photovoltaic power generation of prediction time is predicted, and is distinguished using the photovoltaic generation power undulate quantity calculation formula
Calculate the photovoltaic generation power undulate quantity of the prediction of two neighboring prediction time；
Judging unit, for judging the photovoltaic generation power undulate quantity at current time and the photovoltaic generation power fluctuation of prediction
Whether amount is more than preset prescribed limits, to obtain judging result；
Energy-storage system output power determination unit determines corresponding energy-storage system output power according to the judging result
Calculation, and determine according to the calculation of fixed energy-storage system output power the output power of energy-storage system, with flat
Sliding distributed photovoltaic power generation short-term fluctuation.
Preferably, wherein the photovoltaic generation power undulate quantity calculation formula are as follows:
Pflu=Ppv(t)-Ppv(t-1),
Wherein, PfluFor the photovoltaic generation power undulate quantity of t moment；PpvIt (t) is output power of the photovoltaic system in t moment；
PpvIt (t-1) is output power of the photovoltaic system at the t-1 moment.
Preferably, wherein the judging unit, judges the photovoltaic generation power undulate quantity at current time and the photovoltaic of prediction
Whether generated output undulate quantity is more than preset prescribed limits, comprising:
Judge whether the photovoltaic generation power undulate quantity at current time is more than or equal to the upper limit of photovoltaic power generation fluctuation limit value；
Judge whether the photovoltaic generation power undulate quantity at current time is less than or equal to the lower limit of photovoltaic power generation fluctuation limit value；With
And
It is greater than the lower limit of photovoltaic power generation fluctuation limit value in the photovoltaic generation power undulate quantity at current time and is less than photovoltaic
When the upper limit of generated output undulate quantity, judge in the photovoltaic generation power undulate quantity of the prediction with the presence or absence of more than photovoltaic power generation
Fluctuate the photovoltaic power generation function power waves momentum of limit value.
Preferably, wherein the energy-storage system output power determination unit, determines corresponding storage according to the judging result
The calculation of energy system output power, comprising:
When the photovoltaic generation power undulate quantity at judging result instruction current time is more than or equal to photovoltaic power generation fluctuation limit
When the upper limit of value, the calculation of corresponding energy-storage system output power is determined are as follows:
Pe(t)=min (Pflu-Pfmax,PEmax),
When the photovoltaic generation power undulate quantity at judging result instruction current time is less than or equal to photovoltaic power generation fluctuation limit
When the lower limit of value, the calculation of corresponding energy-storage system output power is determined are as follows:
Pe(t)=min (| Pflu-Pfmax|,PEmax),
It is more than photovoltaic power generation when whether there is in the photovoltaic generation power undulate quantity that the judging result indicates judgement prediction
When fluctuating the photovoltaic power generation function power waves momentum of limit value, the calculation of corresponding energy-storage system output power is determined are as follows:
The output power of energy-storage system is determined according to the state of charge of energy-storage system and energy storage prediction action state；
Wherein, PeIt (t) is the energy-storage system output power of current time t moment；PfluFor the photovoltaic generation power of t moment
Undulate quantity；PfmaxWith-PfmaxThe respectively upper and lower bound of photovoltaic power generation fluctuation limit value；PemaxWith-PemaxRespectively energy-storage system
The upper and lower bound of output power limit value.
Preferably, wherein described determine energy-storage system according to the state of charge and energy storage prediction action state of energy-storage system
Output power, comprising:
As SOC (t) > SOCup, and S1=1 or S2When=1, energy-storage system output power is determined are as follows:
Pe(t)=min ((SOC (t)-SOCup)Ee/Δt,PEmax),
As SOC (t) > SOCup, and S1=0 or S2When=1, energy-storage system output power is determined are as follows:
Pe(t)=min ((SOClow-SOC(t))Ee/ Δ t, PEmax),
In the case of other, determine that energy-storage system output power is 0；
Wherein, SOC (t) is the state of charge of t moment energy-storage system；SOCupAnd SOClowThe respectively lotus of energy-storage system
The upper and lower bound of electricity condition limit value；EeFor energy storage system capacity；Δ t time interval；S1And S2For energy storage prediction action state；
S1State value at the time of needing energy-storage system charge or discharge for first in predetermined period T；S2For in entire predetermined period T
State value at the time of energy-storage system charge or discharge；PEmaxFor the upper limit of energy-storage system output power limit value.
Preferably, wherein the system also includes: energy storage prediction action status determining unit is used for
If the photovoltaic power generation undulate quantity in entire preset time period containing prediction time has been more than photovoltaic power generation fluctuation limit
Value, i.e. some prediction time t in preset time periodiPhotovoltaic power generation undulate quantity be first more limit value, and be more than photovoltaic
The upper limit P of power generation fluctuation limit valuefmax, it is determined that S1=1；If being more than the lower limit-P of photovoltaic power generation fluctuation limit valuefmax, it is determined that
S1=0；
If the photovoltaic power generation undulate quantity of all prediction times is less than photovoltaic power generation fluctuation in entire preset time period
Limit value, i.e. energy-storage system are failure to actuate, it is determined that S2=1.
The present invention provides the energy storage system control method and system of a kind of smooth distribution formula photovoltaic power generation short-term fluctuation, packets
It includes: calculating the photovoltaic generation power undulate quantity at current time using photovoltaic generation power undulate quantity calculation formula；At current time,
The generated output of the photovoltaic power generation of each prediction time in preset time period is predicted, and is calculated separately two neighboring pre-
Survey the photovoltaic generation power undulate quantity of the prediction at moment；Judge the photovoltaic generation power undulate quantity at current time and the photovoltaic of prediction
Whether generated output undulate quantity is more than preset prescribed limits, to obtain judging result；It is determined according to the judging result corresponding
Energy-storage system output power calculation, and energy storage is determined according to the calculation of fixed energy-storage system output power
The output power of system, with smooth distribution formula photovoltaic power generation short-term fluctuation.The present invention when energy-storage system does not need flat volatility,
Judge whether to need to be adjusted the state-of-charge of energy-storage system according to the prediction of the ultra-short term of distributed photovoltaic power generation, and can
The process is repeated at each moment；On the basis of not influencing smooth photovoltaic power generation ripple effect, it can roll to energy storage electricity
The state-of-charge in pond is adjusted, and then alleviates the problem of energy-storage battery regulating power deficiency, reduces the out-of-limit general of photovoltaic power generation
Rate.
Detailed description of the invention
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by:
Fig. 1 is the energy storage system control method according to the smooth distribution formula photovoltaic power generation short-term fluctuation of embodiment of the present invention
100 flow chart；
Fig. 2 is the flow chart controlled using energy-storage system according to embodiment of the present invention；
Fig. 3 is the schematic diagram that ultra-short term prediction is carried out according to the rolling of embodiment of the present invention；
Fig. 4 is photovoltaic-energy-storage system cogeneration schematic diagram according to embodiment of the present invention；
Fig. 5 is photovoltaic-energy-storage system Combined Treatment schematic diagram of two methods；
Fig. 6 is the schematic diagram of photovoltaic-energy-storage system processing fluctuation of two methods；
Fig. 7 is the schematic diagram of the state-of-charge of the energy-storage battery of two methods；And
Fig. 8 is the energy-storage system control system according to the smooth distribution formula photovoltaic power generation short-term fluctuation of embodiment of the present invention
800 structural schematic diagram.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 1 is the energy storage system control method according to the smooth distribution formula photovoltaic power generation short-term fluctuation of embodiment of the present invention
100 flow chart.As shown in Figure 1, the energy storage for the smooth distribution formula photovoltaic power generation short-term fluctuation that embodiments of the present invention provide
System control method predicts that judgement is according to the ultra-short term of distributed photovoltaic power generation when energy-storage system does not need flat volatility
It is no to need to be adjusted the state-of-charge of energy-storage system, and the process can be repeated at each moment；It is not influencing smoothly
On the basis of photovoltaic power generation ripple effect, it can roll and the state-of-charge of energy-storage battery is adjusted, and then alleviate energy storage electricity
The problem of pond regulating power deficiency, reduces the out-of-limit probability of photovoltaic power generation.The smooth distribution formula that embodiments of the present invention provide
The energy storage system control method 100 of photovoltaic power generation short-term fluctuation utilizes photovoltaic power generation function since step 101 place, in step 101
The photovoltaic generation power undulate quantity at rate undulate quantity calculation formula calculating current time.
Preferably, wherein the photovoltaic generation power undulate quantity calculation formula are as follows:
Pflu=Ppv(t)-Ppv(t-1),
Wherein, PfluFor the photovoltaic generation power undulate quantity of t moment；PpvIt (t) is output power of the photovoltaic system in t moment；
PpvIt (t-1) is output power of the photovoltaic system at the t-1 moment.
Preferably, in step 102 at current time, to the hair of the photovoltaic power generation of each prediction time in preset time period
Electrical power is predicted, and calculates separately two neighboring prediction time using the photovoltaic generation power undulate quantity calculation formula
The photovoltaic generation power undulate quantity of prediction.
In embodiments of the present invention, preferred, to determine photovoltaic generation power undulate quantity, comprising: the photovoltaic of t moment is sent out
The photovoltaic generation power undulate quantity of electrical power undulate quantity and prediction time.
Firstly, it is necessary to determine sampling time interval, predetermined period, energy storage system capacity, energy storage output power limit value, energy storage
System SOC limit value, photovoltaic power generation fluctuate limit value in the generated output at t moment and t-1 moment, photovoltaic power generation.
Wherein, the sampling time interval of control method of the present invention is indicated with Δ t.Predetermined period is indicated with T.The energy storage system
Unite capacity EeIt indicates；P is limited the use of on the energy-storage system output power limit valueemaxIndicate, under limit the use of-PemaxIt indicates, energy storage output
Power limit is determined by energy storage device (current transformer), rated power of the system output power no more than current transformer.It is described
SOC is limited the use of on energy-storage system SOC limit valueupIndicate, under limit the use of SOClowIt indicates.Output power P of the photovoltaic system in t momentpv
(t) it indicates, the output power P at t-1 momentpv(t-1) it indicates.P is limited the use of on photovoltaic power generation fluctuation limit valuefmaxIndicate, under limit the use of-
PfmaxIt indicates.
The photovoltaic generation power of t moment and the photovoltaic generation power at t-1 moment, which are made difference, can be obtained the photovoltaic wave of t moment
Dynamic quantity of power.
For the generated output undulate quantity of prediction time, need in moment t, to the photovoltaic generation power in predetermined period T
Predicted, and calculate separately two neighboring prediction time photovoltaic generation power undulate quantity difference to obtain prediction time
Generated output fluctuation measures.
There is mature prediction algorithm now, photovoltaic hair can be predicted according to Weather information (intensity of illumination, temperature etc.)
Therefore how electrical power carries out the considerations of prediction is not belonging to this patent range.
Include: t+1, t+2 ..., t+6 in predetermined period T for example, since t moment, totally six prediction times (when
Between between be divided into Δ t), then can obtain the photovoltaic generation powers of 6 predictions, then, utilize the photovoltaic power generations of 6 of acquisition predictions
Power calculates the difference of the photovoltaic generation power of two adjacent prediction times according to photovoltaic generation power undulate quantity calculation formula, with
Obtain photovoltaic generation power undulate quantity and 6 values.
Preferably, the photovoltaic generation power undulate quantity at current time and the photovoltaic generation power of prediction are judged in step 103
Whether undulate quantity is more than preset prescribed limits, to obtain judging result.
Preferably, wherein the photovoltaic generation power wave of the photovoltaic generation power undulate quantity at the judgement current time and prediction
Whether momentum is more than preset prescribed limits, comprising:
Judge whether the photovoltaic generation power undulate quantity at current time is more than or equal to the upper limit of photovoltaic power generation fluctuation limit value；
Judge whether the photovoltaic generation power undulate quantity at current time is less than or equal to the lower limit of photovoltaic power generation fluctuation limit value；With
And
It is greater than the lower limit of photovoltaic power generation fluctuation limit value in the photovoltaic generation power undulate quantity at current time and is less than photovoltaic
When the upper limit of generated output undulate quantity, judge in the photovoltaic generation power undulate quantity of the prediction with the presence or absence of more than photovoltaic power generation
Fluctuate the photovoltaic power generation function power waves momentum of limit value.
Preferably, the calculation of corresponding energy-storage system output power is determined according to the judging result in step 104,
And the output power of energy-storage system is determined according to the calculation of fixed energy-storage system output power, with smooth distribution formula light
Volt power generation short-term fluctuation.
Preferably, wherein the calculation for determining corresponding energy-storage system output power according to the judging result,
Include:
When the photovoltaic generation power undulate quantity at judging result instruction current time is more than or equal to photovoltaic power generation fluctuation limit
When the upper limit of value, the calculation of corresponding energy-storage system output power is determined are as follows:
Pe(t)=min (Pflu-Pfmax,PEmax),
When the photovoltaic generation power undulate quantity at judging result instruction current time is less than or equal to photovoltaic power generation fluctuation limit
When the lower limit of value, the calculation of corresponding energy-storage system output power is determined are as follows:
Pe(t)=min (| Pflu-Pfmax|,PEmax),
It is more than photovoltaic power generation when whether there is in the photovoltaic generation power undulate quantity that the judging result indicates judgement prediction
When fluctuating the photovoltaic power generation function power waves momentum of limit value, the calculation of corresponding energy-storage system output power is determined are as follows:
The output power of energy-storage system is determined according to the state of charge of energy-storage system and energy storage prediction action state；
Wherein, PeIt (t) is the energy-storage system output power of current time t moment；PfluFor the photovoltaic generation power of t moment
Undulate quantity；PfmaxWith-PfmaxThe respectively upper and lower bound of photovoltaic power generation fluctuation limit value；PemaxWith-PemaxRespectively energy-storage system
The upper and lower bound of output power limit value.
Preferably, wherein described determine energy-storage system according to the state of charge and energy storage prediction action state of energy-storage system
Output power, comprising:
As SOC (t) > SOCup, and S1=1 or S2When=1, energy-storage system output power is determined are as follows:
Pe(t)=min ((SOC (t)-SOCup)Ee/ Δ t, PEmax),
As SOC (t) > SOCup, and S1=0 or S2When=1, energy-storage system output power is determined are as follows:
Pe(t)=min ((SOClow-SOC(t))Ee/ Δ t, PEmax),
In the case of other, determine that energy-storage system output power is 0；
Wherein, SOC (t) is the state of charge of t moment energy-storage system；SOCupAnd SOClowThe respectively lotus of energy-storage system
The upper and lower bound of electricity condition limit value；EeFor energy storage system capacity；Δ t time interval；S1And S2For energy storage prediction action state；
S1State value at the time of needing energy-storage system charge or discharge for first in predetermined period T；S2For in entire predetermined period T
State value at the time of energy-storage system charge or discharge；PEmaxFor the upper limit of energy-storage system output power limit value.
Preferably, wherein the method also includes:
If the photovoltaic power generation undulate quantity in entire preset time period containing prediction time has been more than photovoltaic power generation fluctuation limit
Value, i.e. some prediction time t in preset time periodiPhotovoltaic power generation undulate quantity be first more limit value, and be more than photovoltaic
The upper limit P of power generation fluctuation limit valuefmax, it is determined that S1=1；If being more than the lower limit-P of photovoltaic power generation fluctuation limit valuefmax, it is determined that
S1=0；
If the photovoltaic power generation undulate quantity of all prediction times is less than photovoltaic power generation fluctuation in entire preset time period
Limit value, i.e. energy-storage system are failure to actuate, it is determined that S2=1.
In embodiments of the present invention, short with smooth distribution formula photovoltaic power generation in the output power for determining energy-storage system
When phase is fluctuated, the specific process controlled using energy-storage system is as shown in Figure 2.
In embodiments of the present invention, if it is judged that instruction meets Pflu> Pfmax, then energy-storage system t moment
Output power Pe(t) are as follows:
Pe(t)=min (Pflu-Pfmax,PEmax)
If it is judged that instruction meets Pflu<-Pfmax, then energy-storage system output power are as follows:
Pe(t)=min (| Pflu-Pfmax|,PEmax)
If it is judged that instruction satisfaction-Pfmax< Pflu< Pfmax, then according to energy storage SOC value and energy storage prediction action state
Determine energy-storage system output power.
Wherein, PeIt (t) is the energy-storage system output power of current time t moment；PfluFor the photovoltaic generation power of t moment
Undulate quantity；PfmaxWith-PfmaxThe respectively upper and lower bound of photovoltaic power generation fluctuation limit value；PemaxWith-PemaxRespectively energy-storage system
The upper and lower bound of output power limit value.
When needing to determine energy-storage system output power according to energy storage SOC value and energy storage prediction action state, if meeting SOC
(t) > SOCup, and S1=1 or S2When=1, it is determined that energy-storage system output power are as follows:
Pe(t)=min ((SOC (t)-SOCup)Ee/ Δ t, PEmax),
If meeting SOC (t) > SOCup, and S1=0 or S2When=1, it is determined that energy-storage system output power are as follows:
Pe(t)=min ((SOClow- SOC (t) Ee/ Δ t, PEmax),
In the case of other, determine that energy-storage system output power is 0.
Wherein, SOC (t) is the state of charge of t moment energy-storage system；SOCupAnd SOClowThe respectively lotus of energy-storage system
The upper and lower bound of electricity condition limit value；EeFor energy storage system capacity；Δ t time interval；S1And S2For energy storage prediction action state；
S1State value at the time of needing energy-storage system charge or discharge for first in predetermined period T；S2For in entire predetermined period T
State value at the time of energy-storage system charge or discharge；PEmax is the upper limit of energy-storage system output power limit value.
For energy storage prediction action state S, S1Energy-storage system charge or discharge are needed for first in predetermined period T
The state value at moment；S2For the state value in entire predetermined period T at the time of energy-storage system charge or discharge.If when some prediction
Carve tiPhotovoltaic generation power undulating value be first more limit value, and be more than upper limit Pfmax, then S1=1；If under being more than
Limit-Pfmax, then S1=0；If the photovoltaic power generation undulate quantity of all prediction times is less than photovoltaic hair in entire preset time period
Electro-mechanical wave limit value, i.e. energy-storage system are failure to actuate, it is determined that S2=1.
The present invention can determine the output power of energy-storage system by rolling forecast.Ultra-short term prediction schematic diagram is rolled as schemed
Shown in 3, detailed process includes: that (1) predicts the photovoltaic generation power in predetermined period T in t moment, and calculates separately
The undulating value of two neighboring sampled point predicted value judges whether there is undulating value beyond defined limit value, judging result is fed back；
(2) value of feedback predicted according to ultra-short term calculates the output power of energy-storage system at this time according to control flow as shown in Figure 2；
(3) step (1) and (2) are repeated at the subsequent time t+1 moment, and with time rolls forward, repeats above-mentioned two step.
Fig. 4 is photovoltaic-energy-storage system cogeneration schematic diagram according to embodiment of the present invention.As shown in figure 4, for storage
Can system and photovoltaic generating system combined operating case schematic diagram, energy-storage system is in non-action state under normal condition, when
Photovoltaic generation power fluctuation is more than max-thresholds, energy-storage system charging, when photovoltaic generation power fluctuation is more than minimum threshold, energy storage
System discharge, to utilize the fluctuation of the smooth photovoltaic generation power of energy-storage system.
Traditional control method and control method proposed by the present invention are compared, photovoltaic-as shown in Figure 5 can be obtained
Power curve is combined in energy storage, and horizontal axis is the time, and the longitudinal axis is photovoltaic-energy storage joint power output.Wherein, Method 1 is to utilize this hair
Power curve is combined in the photovoltaic that the control method of bright embodiment obtains-energy storage, and Method 2 is obtained according to traditional control method
The curve arrived.As it can be seen that in the case where photovoltaic generation power fluctuating range is no more than limit value, curve phase that two methods obtain
Together, and in dashed rectangle, when photovoltaic generation power fluctuating range is larger, dotted line and straight line waveform have apparent difference.
Fig. 6 is the fluctuating range curve of the photovoltaic power of two methods, and the longitudinal axis is the mark of the fluctuating range of photovoltaic power
Value.As shown in fig. 6, star setting-out curve has been more than 10%, and dotted line curve is not above in figure in two dashed rectangles in lower section
10%, illustrate that photovoltaic power fluctuation can be more efficiently limited in reasonable range by the mentioned method of the present invention.Above
In two dashed rectangles, star setting-out and dotted line curve have all surpassed 10%, but the value of star setting-out curve is less than dotted line curve
Value, illustrate both of which beyond fluctuation limit value when, the mentioned method of embodiments of the present invention can be than conventional method
It fluctuates smaller.
Fig. 7 is the comparison diagram of battery charge state (SoC) curve of two methods.With three arrows to dotted line song in figure
Line is marked, and at the time of arrow mark, energy-storage system needs to discharge to improve photovoltaic power, the charged shape of energy-storage battery
Therefore state also reduces, however, since its state-of-charge is in minimum value 0.1, battery can not export electricity for star setting-out curve
Can, cause energy-storage system can not the smooth photovoltaic power fluctuation of output power.For star setting-out curve, in the charged shape of energy-storage system
When state reaches minimum value, due to adjusted, the state-of-charge of energy-storage battery has been restored to the state that can be adjusted.
The present invention can roll the lotus to energy-storage battery on the basis of not influencing smooth photovoltaic power generation ripple effect
Electricity condition is adjusted, and then alleviates the problem of energy-storage battery regulating power deficiency, reduces the out-of-limit probability of photovoltaic power generation.
Fig. 8 is the energy-storage system control system according to the smooth distribution formula photovoltaic power generation short-term fluctuation of embodiment of the present invention
800 structural schematic diagram.As shown in figure 8, the smooth distribution formula photovoltaic power generation short-term fluctuation that embodiments of the present invention provide
Energy-storage system control system 800, comprising: current time photovoltaic generation power undulate quantity computing unit 801, the photovoltaic power generation predicted
Power swing amount computing unit 802, judging unit 803 and energy-storage system output power determination unit 804.
Preferably, the current time photovoltaic generation power undulate quantity computing unit 801, for utilizing photovoltaic generation power
The photovoltaic generation power undulate quantity at undulate quantity calculation formula calculating current time.
Preferably, wherein the photovoltaic generation power undulate quantity calculation formula are as follows:
Pflu=Ppv(t)-Ppv(t-1),
Wherein, PfluFor the photovoltaic generation power undulate quantity of t moment；PpvIt (t) is output power of the photovoltaic system in t moment；
PpvIt (t-1) is output power of the photovoltaic system at the t-1 moment.
Preferably, the photovoltaic generation power undulate quantity computing unit 802 of the prediction is used at current time, to default
The generated output of the photovoltaic power generation of each prediction time in period is predicted, and is fluctuated using the photovoltaic generation power
Amount calculation formula calculates separately the photovoltaic generation power undulate quantity of the prediction of two neighboring prediction time.
Preferably, the judging unit 803, for judging the photovoltaic generation power undulate quantity at current time and the light of prediction
Lie prostrate whether generated output undulate quantity is more than preset prescribed limits, to obtain judging result.
Preferably, wherein the judging unit 803, judges the photovoltaic generation power undulate quantity at current time and the light of prediction
Lie prostrate whether generated output undulate quantity is more than preset prescribed limits, comprising: judge the photovoltaic generation power undulate quantity at current time
Whether the upper limit of photovoltaic power generation fluctuation limit value is more than or equal to；Judge whether the photovoltaic generation power undulate quantity at current time is less than
In the lower limit of photovoltaic power generation fluctuation limit value；And the photovoltaic generation power undulate quantity at current time is greater than photovoltaic power generation fluctuation limit
The lower limit of value and be less than photovoltaic generation power undulate quantity the upper limit when, judge in the photovoltaic generation power undulate quantity of the prediction
With the presence or absence of the photovoltaic power generation function power waves momentum for being more than photovoltaic power generation fluctuation limit value.
Preferably, the energy-storage system output power determination unit 804, determines corresponding energy storage according to the judging result
The calculation of system output power, and energy-storage system is determined according to the calculation of fixed energy-storage system output power
Output power, with smooth distribution formula photovoltaic power generation short-term fluctuation.
Preferably, wherein the energy-storage system output power determination unit 804, determines corresponding according to the judging result
The calculation of energy-storage system output power, comprising:
When the photovoltaic generation power undulate quantity at judging result instruction current time is more than or equal to photovoltaic power generation fluctuation limit
When the upper limit of value, the calculation of corresponding energy-storage system output power is determined are as follows:
Pe(t)=min (Pflu-Pfmax,PEmax),
When the photovoltaic generation power undulate quantity at judging result instruction current time is less than or equal to photovoltaic power generation fluctuation limit
When the lower limit of value, the calculation of corresponding energy-storage system output power is determined are as follows:
Pe(t)=min (| Pflu-Pfmax|,PEmax),
It is more than photovoltaic power generation when whether there is in the photovoltaic generation power undulate quantity that the judging result indicates judgement prediction
When fluctuating the photovoltaic power generation function power waves momentum of limit value, the calculation of corresponding energy-storage system output power is determined are as follows:
The output power of energy-storage system is determined according to the state of charge of energy-storage system and energy storage prediction action state；
Wherein, PeIt (t) is the energy-storage system output power of current time t moment；PfluFor the photovoltaic generation power of t moment
Undulate quantity；PfmaxWith-PfmaxThe respectively upper and lower bound of photovoltaic power generation fluctuation limit value；PemaxWith-PemaxRespectively energy-storage system
The upper and lower bound of output power limit value.
Preferably, wherein described determine energy-storage system according to the state of charge and energy storage prediction action state of energy-storage system
Output power, comprising:
As SOC (t) > SOCup, and S1=1 or S2When=1, energy-storage system output power is determined are as follows:
Pe(t)=min ((SOC (t)-SOCup)Ee/ Δ t, PEmax),
As SOC (t) > SOCup, and S1=0 or S2When=1, energy-storage system output power is determined are as follows:
Pe(t)=min ((SOClow-SOC(t))Ee/PEmax),
In the case of other, determine that energy-storage system output power is 0；
Wherein, SOC (t) is the state of charge of t moment energy-storage system；SOCupAnd SOClowThe respectively lotus of energy-storage system
The upper and lower bound of electricity condition limit value；EeFor energy storage system capacity；Δ t time interval；S1And S2For energy storage prediction action state；
S1State value at the time of needing energy-storage system charge or discharge for first in predetermined period T；S2For in entire predetermined period T
State value at the time of energy-storage system charge or discharge；PEmaxFor the upper limit of energy-storage system output power limit value.
Preferably, wherein the system also includes energy storage prediction action status determining units, if in entire preset
Between in section the photovoltaic power generation undulate quantity containing prediction time be more than photovoltaic power generation fluctuation limit value, i.e., some is pre- in preset time period
Survey moment tiPhotovoltaic power generation undulate quantity be first more limit value, and be more than photovoltaic power generation fluctuation limit value upper limit Pfmax, then
Determine S1=1；If being more than the lower limit-P of photovoltaic power generation fluctuation limit valuefmax, it is determined that S1=0；If in entire preset time period
The photovoltaic power generation undulate quantity of all prediction times is less than photovoltaic power generation fluctuation limit value, i.e. energy-storage system is failure to actuate, it is determined that
S2=1.
Fig. 8 of the embodiment of the present invention is the smooth distribution formula photovoltaic power generation short-term fluctuation according to embodiment of the present invention
Fig. 8 of energy-storage system control system 800 and another embodiment of the invention is the smooth distribution according to embodiment of the present invention
The method 100 of the energy-storage system control system 800 of formula photovoltaic power generation short-term fluctuation is corresponding, and details are not described herein.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as
Defined by subsidiary Patent right requirement, in addition to the present invention other embodiments disclosed above equally fall in it is of the invention
In range.
Normally, all terms used in the claims are all solved according to them in the common meaning of technical field
It releases, unless in addition clearly being defined wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
At least one example being construed in described device, component etc., unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurate sequence, unless explicitly stated otherwise.
Claims (12)
1. a kind of energy storage system control method of smooth distribution formula photovoltaic power generation short-term fluctuation, which is characterized in that the method packet
It includes:
The photovoltaic generation power undulate quantity at current time is calculated using photovoltaic generation power undulate quantity calculation formula；
At current time, the generated output of the photovoltaic power generation of each prediction time in preset time period is predicted, and benefit
The photovoltaic generation power of the prediction of two neighboring prediction time is calculated separately with the photovoltaic generation power undulate quantity calculation formula
Undulate quantity；
Whether the photovoltaic generation power undulate quantity of the photovoltaic generation power undulate quantity and prediction that judge current time is more than preset
Prescribed limits, to obtain judging result；
The calculation of corresponding energy-storage system output power is determined according to the judging result, and according to fixed energy storage system
The calculation of system output power determines the output power of energy-storage system, with smooth distribution formula photovoltaic power generation short-term fluctuation.
2. the method according to claim 1, wherein the photovoltaic generation power undulate quantity calculation formula are as follows:
Pflu=Ppv(t)-Ppv(t-1),
Wherein, PfluFor the photovoltaic generation power undulate quantity of t moment；PpvIt (t) is output power of the photovoltaic system in t moment；Ppv
It (t-1) is output power of the photovoltaic system at the t-1 moment.
3. the method according to claim 1, wherein the photovoltaic generation power undulate quantity at the judgement current time
Whether the photovoltaic generation power undulate quantity with prediction is more than preset prescribed limits, comprising:
Judge whether the photovoltaic generation power undulate quantity at current time is more than or equal to the upper limit of photovoltaic power generation fluctuation limit value；
Judge whether the photovoltaic generation power undulate quantity at current time is less than or equal to the lower limit of photovoltaic power generation fluctuation limit value；And
It is greater than the lower limit of photovoltaic power generation fluctuation limit value in the photovoltaic generation power undulate quantity at current time and is less than photovoltaic power generation
When the upper limit of power waves momentum, judge to fluctuate in the photovoltaic generation power undulate quantity of the prediction with the presence or absence of more than photovoltaic power generation
The photovoltaic power generation function power waves momentum of limit value.
4. the method according to claim 1, wherein described determine corresponding energy storage system according to the judging result
The calculation of system output power, comprising:
When the photovoltaic generation power undulate quantity at judging result instruction current time is more than or equal to photovoltaic power generation fluctuation limit value
When the upper limit, the calculation of corresponding energy-storage system output power is determined are as follows:
Pe(t)=min (Pflu-Pfmax,PEmax),
When the photovoltaic generation power undulate quantity at judging result instruction current time is less than or equal to photovoltaic power generation fluctuation limit value
When lower limit, the calculation of corresponding energy-storage system output power is determined are as follows:
Pe(t)=min (| Pflu-Pfmax|,PEmax),
It is more than that photovoltaic power generation fluctuates when whether there is in the photovoltaic generation power undulate quantity that the judging result indicates judgement prediction
When the photovoltaic power generation function power waves momentum of limit value, the calculation of corresponding energy-storage system output power is determined are as follows:
The output power of energy-storage system is determined according to the state of charge of energy-storage system and energy storage prediction action state；
Wherein, PeIt (t) is the energy-storage system output power of current time t moment；PfluIt is fluctuated for the photovoltaic generation power of t moment
Amount；PfmaxWith-PfmaxThe respectively upper and lower bound of photovoltaic power generation fluctuation limit value；PemaxWith-PemaxRespectively energy-storage system exports
The upper and lower bound of power limit.
5. according to the method described in claim 4, it is characterized in that, described pre- according to the state of charge of energy-storage system and energy storage
Survey the output power that action state determines energy-storage system, comprising:
As SOC (t) > SOCup, and S1=1 or S2When=1, energy-storage system output power is determined are as follows:
Pe(t)=min ((SOC (t)-SOCup)Ee/ Δ t, PEmax),
As SOC (t) > SOCup, and S1=0 or S2When=1, energy-storage system output power is determined are as follows:
Pe(t)=min ((SOClow-SOC(t))Ee/ Δ t, PEmax),
In the case of other, determine that energy-storage system output power is 0；
Wherein, SOC (t) is the state of charge of t moment energy-storage system；SOCupAnd SOClowThe respectively charged shape of energy-storage system
The upper and lower bound of state limit value；EeFor energy storage system capacity；Δ t time interval；S1And S2For energy storage prediction action state；S1For
First state value at the time of need energy-storage system charge or discharge in predetermined period T；S2For energy storage in entire predetermined period T
State value at the time of system charge or discharge；PEmaxFor the upper limit of energy-storage system output power limit value.
6. according to the method described in claim 5, it is characterized in that, the method also includes:
If the photovoltaic power generation undulate quantity in entire preset time period containing prediction time has been more than photovoltaic power generation fluctuation limit value, i.e.,
Some prediction time t in preset time periodiPhotovoltaic power generation undulate quantity be first more limit value, and be more than photovoltaic power generation wave
The upper limit P of dynamic limit valuefmax, it is determined that S1=1；If being more than the lower limit-P of photovoltaic power generation fluctuation limit valuefmax, it is determined that S1=0；
If the photovoltaic power generation undulate quantity of all prediction times is less than photovoltaic power generation fluctuation limit value in entire preset time period,
I.e. energy-storage system is failure to actuate, it is determined that S2=1.
7. a kind of energy-storage system control system of smooth distribution formula photovoltaic power generation short-term fluctuation, which is characterized in that the system packet
It includes:
Current time photovoltaic generation power undulate quantity computing unit, for being calculated using photovoltaic generation power undulate quantity calculation formula
The photovoltaic generation power undulate quantity at current time；
The photovoltaic generation power undulate quantity computing unit of prediction is used at current time, to each prediction in preset time period
The generated output of the photovoltaic power generation at moment is predicted, and is calculated separately using the photovoltaic generation power undulate quantity calculation formula
The photovoltaic generation power undulate quantity of the prediction of two neighboring prediction time；
Judging unit, for judging that photovoltaic generation power undulate quantity and the photovoltaic generation power undulate quantity of prediction at current time be
No is more than preset prescribed limits, to obtain judging result；
Energy-storage system output power determination unit determines the calculating of corresponding energy-storage system output power according to the judging result
Mode, and determine according to the calculation of fixed energy-storage system output power the output power of energy-storage system, smoothly to divide
Cloth photovoltaic power generation short-term fluctuation.
8. system according to claim 7, which is characterized in that the photovoltaic generation power undulate quantity calculation formula are as follows:
Pflu=Ppv(t)-Ppv(t-1),
Wherein, PfluFor the photovoltaic generation power undulate quantity of t moment；PpvIt (t) is output power of the photovoltaic system in t moment；Ppv
It (t-1) is output power of the photovoltaic system at the t-1 moment.
9. system according to claim 7, which is characterized in that the judging unit judges the photovoltaic power generation at current time
Whether power waves momentum and the photovoltaic generation power undulate quantity of prediction are more than preset prescribed limits, comprising:
Judge whether the photovoltaic generation power undulate quantity at current time is more than or equal to the upper limit of photovoltaic power generation fluctuation limit value；
Judge whether the photovoltaic generation power undulate quantity at current time is less than or equal to the lower limit of photovoltaic power generation fluctuation limit value；And
It is greater than the lower limit of photovoltaic power generation fluctuation limit value in the photovoltaic generation power undulate quantity at current time and is less than photovoltaic power generation
When the upper limit of power waves momentum, judge to fluctuate in the photovoltaic generation power undulate quantity of the prediction with the presence or absence of more than photovoltaic power generation
The photovoltaic power generation function power waves momentum of limit value.
10. system according to claim 7, which is characterized in that the energy-storage system output power determination unit, according to institute
State the calculation that judging result determines corresponding energy-storage system output power, comprising:
When the photovoltaic generation power undulate quantity at judging result instruction current time is more than or equal to photovoltaic power generation fluctuation limit value
When the upper limit, the calculation of corresponding energy-storage system output power is determined are as follows:
Pe(t)=min (Pflu-Pfmax,PEmax),
When the photovoltaic generation power undulate quantity at judging result instruction current time is less than or equal to photovoltaic power generation fluctuation limit value
When lower limit, the calculation of corresponding energy-storage system output power is determined are as follows:
Pe(t)=min (| Pflu-Pfmax|,PEmax),
It is more than that photovoltaic power generation fluctuates when whether there is in the photovoltaic generation power undulate quantity that the judging result indicates judgement prediction
When the photovoltaic power generation function power waves momentum of limit value, the calculation of corresponding energy-storage system output power is determined are as follows:
The output power of energy-storage system is determined according to the state of charge of energy-storage system and energy storage prediction action state；
Wherein, PeIt (t) is the energy-storage system output power of current time t moment；PfluIt is fluctuated for the photovoltaic generation power of t moment
Amount；PfmaxWith-PfmaxThe respectively upper and lower bound of photovoltaic power generation fluctuation limit value；PemaxWith-PemaxRespectively energy-storage system exports
The upper and lower bound of power limit.
11. system according to claim 10, which is characterized in that the state of charge and energy storage according to energy-storage system
Prediction action state determines the output power of energy-storage system, comprising:
As SOC (t) > SOCup, and S1=1 or S2When=1, energy-storage system output power is determined are as follows:
Pe(t)=min ((SOC (t)-SOCup)Ee/ Δ t, PEmax),
As SOC (t) > SOCup, and S1=0 or S2When=1, energy-storage system output power is determined are as follows:
Pe(t)=min ((SOClow-SOC(t))Ee/ Δ t, PEmax),
In the case of other, determine that energy-storage system output power is 0；
Wherein, SOC (t) is the state of charge of t moment energy-storage system；SOCupAnd SOClowThe respectively charged shape of energy-storage system
The upper and lower bound of state limit value；EeFor energy storage system capacity；Δ t time interval；S1And S2For energy storage prediction action state；S1For
First state value at the time of need energy-storage system charge or discharge in predetermined period T；S2For energy storage in entire predetermined period T
State value at the time of system charge or discharge；PEmaxFor the upper limit of energy-storage system output power limit value.
12. system according to claim 11, which is characterized in that the system also includes: energy storage prediction action state is true
Order member, is used for
If the photovoltaic power generation undulate quantity in entire preset time period containing prediction time has been more than photovoltaic power generation fluctuation limit value, i.e.,
Some prediction time t in preset time periodiPhotovoltaic power generation undulate quantity be first more limit value, and be more than photovoltaic power generation wave
The upper limit P of dynamic limit valuefmax, it is determined that S1=1；If being more than the lower limit-P of photovoltaic power generation fluctuation limit valuefmax, it is determined that S1=0；
If the photovoltaic power generation undulate quantity of all prediction times is less than photovoltaic power generation fluctuation limit value in entire preset time period,
I.e. energy-storage system is failure to actuate, it is determined that S2=1.
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| CN117543619A (en) * | 2023-11-09 | 2024-02-09 | 国网冀北电力有限公司秦皇岛供电公司 | Photovoltaic energy storage integrated power generation system based on distributed access |
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