CN104682436B - Energy storage system micro-grid capable of inhibiting power fluctuation - Google Patents
Energy storage system micro-grid capable of inhibiting power fluctuation Download PDFInfo
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- CN104682436B CN104682436B CN201510116670.4A CN201510116670A CN104682436B CN 104682436 B CN104682436 B CN 104682436B CN 201510116670 A CN201510116670 A CN 201510116670A CN 104682436 B CN104682436 B CN 104682436B
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- 238000011156 evaluation Methods 0.000 claims description 33
- 238000012544 monitoring process Methods 0.000 claims description 32
- 230000005611 electricity Effects 0.000 claims description 17
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Classifications
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
-
- H02J3/386—
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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
-
- 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
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/14—District level solutions, i.e. local energy networks
Abstract
The invention discloses an energy storage system micro-grid 10 capable of inhibiting power fluctuation. The micro-grid 10 comprises photovoltaic power generation equipment 12, an energy storage system 13, wind power generation equipment 14, an AC/DC bidirectional current conversion module I 16, a direct-current bus, an AC/DC bidirectional current conversion module II 15, a load 17 and a monitoring device 11, wherein the AC/DC bidirectional current conversion module I 16 is used for connecting and isolating the photovoltaic power generation equipment 12 from the direct-current bus; the AC/DC bidirectional current conversion module II 15 is used for connecting the photovoltaic power generation equipment 12 with the direct-current bus. The micro-grid disclosed by the invention has the advantages that firstly, the output power change situation of the wind power generation equipment and the photovoltaic power generation equipment can be accurately predicted, secondly, the power change of a connecting point of the micro-grid with a large power grid and the power change of the load inside the micro-grid can be accurately predicted, and thirdly, large power grid scheduling requirements and the operation situation of the energy storage system are both considered in a control strategy, active power and reactive power can be simultaneously provided for the large power grid, the scheduling requirements of the large power grid and the requirements of the load inside the micro-grid are met, at the same time the power fluctuation of the micro-grid can be effectively inhibited, the power supply reliability is also achieved, the security of the micro-grid is ensured, and the service life of equipment inside the micro-grid is prolonged.
Description
Art
The present invention relates to a kind of micro-capacitance sensor of the energy-storage system having and can stabilizing power swing.
Background technology
Micro-capacitance sensor (micro-grid) is also translated into microgrid, is a kind of new network structure, is one group of micro battery, load, storage
Can the system unit that constitutes of system and control device, be capable of the autonomous system of self-contr ol, protection and management, both can be with
External electrical network is incorporated into the power networks it is also possible to isolated operation.
Micro-capacitance sensor using wind-powered electricity generation and photovoltaic generation based on is as supertension, remote, bulk power grid powering mode supplement, generation
The new developing direction of power system by table.Wind energy and solar energy resources are the regenerative resources of cleaning, but exist randomness and
The problem of undulatory property, brings a series of impact to electrical network.The original trend of undulatory property degree direct influence electrical network of power is divided
Cloth, when the permeability of wind-power electricity generation and photovoltaic generation is in higher level, undulatory property and randomness can be to original fortune of electrical network
Line mode brings huge impact.In order to reduce this impact, can be in the system of Wind turbines and photovoltaic plant cogeneration
Middle configuration large-scale energy storage system cooperation.
Energy storage technology plays an important role to the realization of micro-capacitance sensor, and its application solves the ripple of generation of electricity by new energy to a great extent
Dynamic property and stochastic problems, effectively improve predictability, definitiveness and the economy in intermittent micro- source.Additionally, energy storage technology exists
Frequency modulation and voltage modulation is active with improvement system, reactive balance level, and the effect improving micro-capacitance sensor stable operation ability aspect also obtain
Widely studied and prove.
However, now configuration large-scale energy storage system price comparison is expensive, therefore, it is necessary to consider power transmission engineering
This, energy-storage system cost, income of transmitting electricity, energy-storage system income, set up and target is turned to comprehensive benefit maximum, given transmission line of electricity
The method that energy-storage system during ability to transmit electricity is distributed rationally.
Content of the invention
The present invention provides a kind of micro-capacitance sensor with the energy-storage system that can stabilize power swing, the measurable micro- electricity of this micro-capacitance sensor
Load change in the generated output and micro-capacitance sensor of the generating equipment in net, traceable and prediction micro-capacitance sensor and bulk power grid junction point
Power, the battery module battery capacity of real-time detection, can formulate and implement optimum control strategy, ensure micro-capacitance sensor simultaneously
Steadily provide active power and reactive power according to the demand of bulk power grid during net, and lift the safety of energy-storage system and use the longevity
Life.
To achieve these goals, the present invention provides a kind of micro-capacitance sensor with the energy-storage system that can stabilize power swing,
This micro-capacitance sensor includes: wind power plant, photovoltaic power generation equipment, energy-storage system, for micro-capacitance sensor is connected with bulk power grid and every
From ac/dc two-way change of current module one, dc bus, be used for connecting wind power plant, photovoltaic power generation equipment and dc bus
Ac/dc two-way change of current module two, load and supervising device in micro-capacitance sensor；
This energy-storage system includes the two-way dc/dc changer that battery module is connected with above-mentioned dc bus；
This supervising device includes:
Wind-power electricity generation generating equipment monitoring module, for monitor in real time wind power plant, and to wind power plant
Generated output is predicted；
Photovoltaic power generation equipment monitoring module, for monitor in real time photovoltaic power generation equipment, and the generating to photovoltaic power generation equipment
Power is predicted；
Energy-storage system monitoring module, can monitor in real time battery module soc and dc/dc reversible transducer；
Bulk power grid contact module, knows the ruuning situation of bulk power grid and related tune for regulating and controlling center from bulk power grid in real time
Degree information；
Be incorporated into the power networks monitoring module, for controlling micro-capacitance sensor to connect or isolating bulk power grid；
Load monitoring module, for the load in monitor in real time energy-accumulating power station；
Middle control module, for determining the operation reserve of micro-capacitance sensor, and sends instruction to each module in above-mentioned supervising device,
To execute this operation reserve；
Bus module, for the liaison of the modules of this supervising device.
Preferably, photovoltaic power generation equipment monitoring module at least includes photovoltaic power generation equipment voltage, current detecting equipment, light intensity
And temperature testing equipment.
Preferably, described photovoltaic power generation equipment monitoring module obtains the service data of photovoltaic power generation equipment in real time, and stores
Data.
Preferably, described wind power plant monitoring module at least includes wind power plant voltage, electric current and frequency inspection
Measurement equipment, wind speed measurement equipment.
Preferably, described wind power plant monitoring module obtains the service data of wind power plant in real time, and stores
Data.
Preferably, energy-storage system monitoring module at least includes accumulator voltage, electric current, soc acquisition equipment and temperature
Testing equipment.
Preferably, described soc obtains equipment and includes: the first acquisition module, for obtaining the working condition of battery；First is true
Cover half block, for determining the evaluation method for estimating battery charge state according to the working condition of battery；Computing module, is used for
Calculate battery according to evaluation method and be in the battery charge state value under different working conditions.
Preferably, the first determining module includes: the first determination sub-module, for being static shape in the working condition getting
In the case of state, determine that evaluation method is the first evaluation method, wherein, the first evaluation method includes open circuit voltage method；Second is true
Stator modules, in the case of being recovery state in the working condition getting, determine that evaluation method is the second evaluation method；
3rd determination sub-module, in the case of being charging and discharging state in the working condition getting, determines that evaluation method is the 3rd
Evaluation method, wherein, the 3rd evaluation method includes Kalman filtering method.
Preferably, battery module adopts lithium battery as the base unit of power storage.
Preferably, described battery module, including n set of cells, described two-way dc/dc changer has n dc/dc and becomes
Stream device, n is more than or equal to 3, and, by a dc/dc inverter controller discharge and recharge, this n dc/dc current transformer is equal for each set of cells
Controlled by energy-storage system monitoring module.
The micro-capacitance sensor of the present invention has the advantage that the defeated of (1) Accurate Prediction wind power plant and photovoltaic power generation equipment
Go out changed power situation；(2) Accurate Prediction micro-capacitance sensor and the changed power of bulk power grid junction point and the work(of micro-capacitance sensor internal load
Rate changes；(3) control strategy is taken into account and is joined bulk power grid scheduling requirement and energy-storage system ruuning situation, can be provided with for bulk power grid simultaneously
Work(power and reactive power, meet bulk power grid dispatching requirement and micro-capacitance sensor internal load demand while, can effectively suppress micro-
The power swing of electrical network, has taken into account power supply reliability, ensures the safety of micro-capacitance sensor, extends the use longevity of equipment in micro-capacitance sensor
Life.
Brief description
Fig. 1 shows a kind of micro-capacitance sensor with the energy-storage system that can stabilize power swing and its supervising device of the present invention
Block diagram；
Fig. 2 shows operation and the monitoring method of the micro-capacitance sensor of the present invention.
Specific embodiment
Fig. 1 shows a kind of micro-capacitance sensor 10 with the energy-storage system that can stabilize power swing of the present invention, this micro- electricity
Net 10 includes: photovoltaic power generation equipment 12, energy-storage system 13, wind power plant 14, for by micro-capacitance sensor 10 with bulk power grid 20 even
The ac/dc two-way change of current module 1 that connects and isolate, dc bus, for connecting photovoltaic power generation equipment 12 and dc bus
Ac/dc two-way change of current module 2 15, load 17 and supervising device 11.
Referring to Fig. 1, this energy-storage system 13 includes the two-way dc/dc change that battery module 131 is connected with above-mentioned dc bus
Parallel operation 132.
This supervising device 11 includes: photovoltaic power generation equipment monitoring module 114, in monitor in real time battery energy storage system 10
Photovoltaic power generation equipment 12, and the generated output of photovoltaic power generation equipment 12 is predicted；Energy-storage system monitoring module 115, uses
Battery module 131 in monitor in real time energy-storage system 131 and dc/dc bidrectional transducer 132；Bulk power grid contact module 112,
For knowing the ruuning situation of bulk power grid 20 and related schedule information from bulk power grid 20 regulation and control center in real time；Parallel control module
116, for controlling micro-capacitance sensor 10 to connect or isolating bulk power grid 20；Middle control module 117, for determining the operation plan of micro-capacitance sensor 10
Omit, and send instruction to above-mentioned each module, to execute this power supply strategy；Wind power plant monitoring module 113, supervises for real-time
Control wind power plant 14；Load monitoring module 118, for the load 17 in real-time micro-capacitance sensor 10；Bus module 111, is used for
The liaison of the modules of this supervising device 11.
Communication module 111, for the communication between above-mentioned modules, it is double that described bus communication module 111 passes through redundancy
Can bus is connected with other modules.
Photovoltaic power generation equipment 12 includes multiple photovoltaic generating modules, and photovoltaic power generation equipment monitoring module 114 at least includes light
The voltage of volt generating equipment, electric current, frequency detection equipment, light-intensity test equipment.
Described wind power plant monitoring module 113 obtains the service data of wind power plant 12 in real time, and stores number
According to.
Energy-storage system monitoring module 116 at least includes accumulator voltage, electric current, soc acquisition equipment and temperature detection
Equipment, can monitor in real time battery module soc.
Described soc obtains equipment and includes: the first acquisition module, for obtaining the working condition of battery；First determining module,
For determining the evaluation method for estimating battery charge state according to the working condition of battery；Computing module, for according to estimating
Calculation method calculates battery and is in the battery charge state value under different working conditions.
First determining module includes: the first determination sub-module, for being the feelings of resting state in the working condition getting
Under condition, determine that evaluation method is the first evaluation method, wherein, the first evaluation method includes open circuit voltage method；Second determination submodule
Block, in the case of being recovery state in the working condition getting, determines that evaluation method is the second evaluation method；3rd is true
Stator modules, in the case of being charging and discharging state in the working condition getting, determine that evaluation method is the 3rd estimation side
Method, wherein, the 3rd evaluation method includes Kalman filtering method.
Further, evaluation method is the 3rd evaluation method, and computing module includes: sets up module, for using three ranks etc.
Effect circuit sets up the battery model of battery；Second determining module, for determining state equation and the measurement equation of battery model；The
One calculating sub module, for the battery charge state value of use state equation and measurement Equation for Calculating battery.
Further, evaluation method is the second evaluation method, and computing module includes: the second acquisition module, for obtaining electricity
Pond is entering the working condition before recovery state；Second calculating sub module, for battery enter recovery state before
In the case that working condition is discharge condition, calculate battery charge state value according to the first formula, wherein, the first formula issoctFor the battery charge state value under recovery state, socdTerminate for discharge condition
When battery charge state value, m is the accumulation electricity in battery discharge procedure, t for battery experience under recovery state when
Between, h is the persistent period of default recovery state, and q is the actual capacity of battery；3rd calculating sub module, for existing in battery
In the case that working condition before entrance recovery state is charged state, calculate battery charge state value according to the second formula,
Wherein, the second formula is soct=socc+ m × h × 100%, soccBattery charge state value when terminating for charged state.
Further, evaluation method is the first evaluation method, and computing module includes: the 3rd acquisition module, for obtaining electricity
The open-circuit voltage in pond；Read module, for reading open-circuit voltage corresponding battery charge state value.
Preferably, battery module 131 adopts lithium battery as the base unit of power storage.
Preferably, described battery module 131, including n set of cells, described dc/dc reversible transducer 132 has n
Dc/dc current transformer, n is more than or equal to 3, and by a dc/dc inverter controller discharge and recharge, this n dc/dc becomes each set of cells
Stream device is controlled by energy-storage system monitoring module.
Middle control module 117 at least includes cpu unit, data storage cell and display unit.
Bulk power grid contact module 112 at least includes Wireless Telecom Equipment.
Parallel control module 116 at least includes the inspection for detecting bulk power grid 20 and micro-capacitance sensor 10 voltage, electric current and frequency
Measurement equipment, data acquisition unit data processing unit.Data acquisition unit comprises to gather pretreatment and a/d modular converter, adopts
Collect eight tunnel telemetered signal amounts, comprise grid side a phase voltage, electric current, the three-phase voltage of energy-accumulating power station side, electric current.Remote measurement amount can be led to
Cross the high-precision current in terminal and voltage transformer and strong ac signal (5a/110v) is changed into internal light current without distortion
Signal, enters a/d chip and carries out analog digital conversion after filtered process, converted after digital signal through data processing unit meter
Calculate, obtain three-phase voltage current value and the bulk power grid 20 side phase voltage current value of wind energy turbine set energy-storage system 10 side.This telemetered signal
Amount processes and employs high-speed and high-density synchronized sampling, automatic frequency tracking technology also has improved fft algorithm, so precision obtains
Fully ensure that, the measurement that wind energy turbine set energy-storage system 10 side is active, idle and electric energy is from fundamental wave to higher harmonic components can be completed
And process.
Referring to accompanying drawing 2, the method for the present invention comprises the steps:
S1. wind power plant and photovoltaic power generation equipment monitoring module obtains wind power plant in real time and photovoltaic generation sets
Standby service data, and data storage；
S2. the service data according to wind power plant and photovoltaic power generation equipment, sends out to the wind-force in following predetermined instant
The output of electric equipment and photovoltaic power generation equipment is predicted；
S3. real-time detection obtains the soc of battery module, obtains load power demand situation in micro-capacitance sensor in real time；
S4. parameter and the schedule information of bulk power grid, prediction future time micro-capacitance sensor and bulk power grid junction point are obtained in real time
Power demand；
S5. the power demand of energy-accumulating power station and bulk power grid junction point, the soc of current batteries to store energy, be currently in electrical network
Load power demand, following wind power plant and photovoltaic power generation equipment output, as constraints, realize micro-capacitance sensor
Optimize and run.
Preferably, in step s2 using prior art in arbitrary wind-power generated power forecasting method prediction wind-power electricity generation set
Standby output.
Preferably, photovoltaic power generation equipment includes photovoltaic module, described in step s2, in the following way prediction photovoltaic send out
The output of electric equipment:
S21. set up the model of exerting oneself of photovoltaic module: ppv(t)=ηinvηpv(t)g(t)spv(1)
S in formulapvReceive the area (m of solar irradiation radiation for photovoltaic panel2), g (t) light radiation numerical value (w/m2), ηpv
T () is photovoltaic module energy conversion efficiency, ηinvFor inverter conversion efficiency；
Wherein, the energy conversion efficiency of photovoltaic module and the temperature of environment are relevant, and ambient temperature turns to photovoltaic module energy
The impact changing efficiency is:
η in formularFor the reference energy conversion efficiency of test under photovoltaic module standard temperature, β is that temperature changes effect to energy
The impact coefficient of rate, tcT () is the temperature value of t photovoltaic module, tcrFor photovoltaic module reference standard temperature value；Photovoltaic module
Absorb solar radiation, can work with ambient temperature one and cause photovoltaic module temperature to change, its expression formula is as follows:
In formula, t is the ambient temperature of surrounding, tratThe rated temperature that photovoltaic module runs；
S22. the sunshine information of the periphery of real-time detection and collection photovoltaics assembly and ambient temperature, according to history sunshine information
And ambient temperature, the intensity of sunshine in prediction following a period of time and ambient temperature；
S23. according to the intensity of sunshine in following a period of time and ambient temperature, using the model of exerting oneself of above-mentioned photovoltaic module
Calculate the generated output of the photovoltaic power generation equipment in future time.
Preferably, in step s4, realize chasing after of power demand at micro-capacitance sensor and bulk power grid junction point using following steps
Track and prediction:
S41. specify micro-capacitance sensor power positive direction everywhere, power direction flows to bulk power grid for just with micro-capacitance sensor；
S42. the power expectation of the actual power according to micro-capacitance sensor each point and points of common connection calculates the public company of micro-grid system
The power of junction, computing formula is:
P in formulaiFor the total generated power forecasting value of scene, pi_sFor output from energy-storage system to bulk power grid, ppccFor
Points of common connection is to the output of bulk power grid, ploadFor flowing into the power of load in micro-capacitance sensor；
S43. determine ppccSpan: ppcc min≤ppcc≤ppcc max, the power of points of common connection now can be made to keep
In the range of the acceptable trend of distribution, ppcc minAnd ppcc maxIt is the minimum threshold value and maximum being obtained by distribution Load flow calculation
Threshold value, works as ppccFluctuation when exceeding above-mentioned restriction threshold, need the output adjusting the energy-storage travelling wave tube in microgrid to stabilize
Power at microgrid points of common connection.
Preferably, realize in the following way optimizing running in step s5:
S51. obtain the first data acquisition system being made up of Wind power forecasting value respectively and by photovoltaic generation power
Second data acquisition system of predictive value composition, by the Wind power forecasting value in described first data acquisition system and described second number
The synthetic data collection being made up of the total generated power forecasting value of scene is obtained according to the photovoltaic power generation power prediction value in set after being added
Close；
S52. using fitting of a polynomial algorithm, described synthetic data set is fitted, obtains smooth formula of exerting oneself；
S53. smooth output valve of exerting oneself is calculated according to described smooth formula of exerting oneself；
S54. according to described smooth output valve and the described scene always magnitude relationship of generated power forecasting value and the difference of exerting oneself
Absolute value, determines exert oneself mode and the power output value of energy-storage system；
Described step s51 specifically includes:
Obtain the first data acquisition system p being made up of Wind power forecasting value1:
p1={ (p1i,ti) | i=1,2..., m }； (5)
Obtain the second data acquisition system p being made up of photovoltaic power generation power prediction value2:
p2={ (p2i,ti) | i=1,2..., m }； (6)
By described first data acquisition system p1In Wind power forecasting value and described second data acquisition system p2In photovoltaic
Generated power forecasting value obtains by the scene synthetic data set p that always generated power forecasting value forms after being added:
P={ (pi,ti) | i=1,2..., m }； (7)
Wherein, pi=p1i+p2i；
Wherein, p1For the first data acquisition system, p1iFor Wind power forecasting value, p2For the second data acquisition system, p2iFor wind
Power generated power forecasting value, p is synthetic data set, piFor the total generated power forecasting value of scene, m is the first data acquisition system, the
Two data acquisition systems, the number of samples of the 3rd data acquisition system, m is natural number, and i is sample sequence number, tiFor p1i、p2i、piCorresponding
Time；
Described step s52 specifically includes:
S521. according to total generated power forecasting value p of scene in described synthetic data set piFluctuation tendency, determine described
The exponent number n of smooth formula of exerting oneself, wherein n are natural number；
S522. matching has a multinomial of described exponent number n:
anti n+an-1ti n-1+…+a1ti+a0； (8)
Wherein, a0～anFor multinomial coefficient；
Step b3, calculates described multinomial anti n+an-1ti n-1+…+a1ti+a0Total generated power forecasting value with described scene
piSquared difference and err:
When s522. utilizing method of least square to calculate described squared difference and err for minima, multinomial coefficient a0～anRight
The occurrence α answering0～αn；
S523. utilize described occurrence α0～αnBuild and smooth formula x (t) of exerting oneself:
X (t)=αntn+αn-1tn-1+…+α1t+α0； (10)
Wherein, t is the time；
Described s53 particularly as follows:
Calculate and work as t=tiWhen, the value x (t of described smooth formula x (t) of exerting oneselfi):
x(ti)=αnti n+αn-1ti n-1+…+α1ti+α0(11)
Wherein, x (ti) for smoothing output valve of exerting oneself；
Described step s54 specifically includes:
As the described smooth output valve x (t that exerts oneselfi) more than total generated power forecasting value p of described sceneiWhen, energy-storage system discharges
Electric energy, and power output value is:
p′i=x (ti)-pi=(αnti n+αn-1ti n-1+…+α1ti+α0)-pi(12)
Wherein, p 'iFor tiThe power output value of moment energy-storage system；
As the described smooth output valve x (t that exerts oneselfi) less than total generated power forecasting value p of described sceneiWhen, energy-storage system absorbs
Electric energy, and power output value is:
p′i=pi-x(ti)=pi-(αnti n+αn-1ti n-1+…+α1ti+α0)； (13)
As the described smooth output valve x (t that exerts oneselfi) it is equal to total generated power forecasting value p of described sceneiWhen, energy-storage system power
Output valve is zero.
Above content is to further describe it is impossible to assert with reference to specific preferred implementation is made for the present invention
Being embodied as of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of present inventive concept, make some equivalent substitutes or obvious modification, and performance or purposes are identical, all should
It is considered as belonging to protection scope of the present invention.
Claims (10)
1. a kind of micro-capacitance sensor with the energy-storage system that can stabilize power swing, this micro-capacitance sensor includes: wind power plant, photovoltaic
Generating equipment, energy-storage system, the ac/dc two-way change of current module one for being connected micro-capacitance sensor with bulk power grid and isolating, direct current mother
Line, for connecting the ac/dc two-way change of current module two of wind power plant, photovoltaic power generation equipment and dc bus, in micro-capacitance sensor
Load and supervising device；
This energy-storage system includes the two-way dc/dc changer that battery module is connected with above-mentioned dc bus；
This supervising device includes:
Wind power plant monitoring module, for monitor in real time wind power plant, and the generated output to wind power plant
It is predicted；
Photovoltaic power generation equipment monitoring module, for monitor in real time photovoltaic power generation equipment, and the generated output to photovoltaic power generation equipment
It is predicted；
Energy-storage system monitoring module, can monitor in real time battery module soc and dc/dc reversible transducer；
Bulk power grid contact module, knows the ruuning situation of bulk power grid and related scheduling letter for regulating and controlling center from bulk power grid in real time
Breath；
Be incorporated into the power networks monitoring module, for controlling micro-capacitance sensor to connect or isolating bulk power grid；
Load monitoring module, for the load in monitor in real time energy-accumulating power station；
Middle control module, for determining the operation reserve of micro-capacitance sensor, and sends instruction to each module in above-mentioned supervising device, to hold
This operation reserve of row；
Bus module, for the liaison of the modules of this supervising device；
This supervising device following manner is realized micro-capacitance sensor optimization and is run:
S51. obtain the first data acquisition system being made up of Wind power forecasting value respectively and by photovoltaic power generation power prediction
Second data acquisition system of value composition, by the Wind power forecasting value in described first data acquisition system and described second data
Photovoltaic power generation power prediction value in set obtains the synthetic data set being made up of the total generated power forecasting value of scene after being added；
S52. using fitting of a polynomial algorithm, described synthetic data set is fitted, obtains smooth formula of exerting oneself；
S53. smooth output valve of exerting oneself is calculated according to described smooth formula of exerting oneself；
S54. absolute with the magnitude relationship of the total generated power forecasting value of described scene and difference according to described smooth output valve of exerting oneself
Value, determines exert oneself mode and the power output value of energy-storage system；
Described step s51 specifically includes:
Obtain the first data acquisition system p being made up of Wind power forecasting value1:
p1={ (p1i,ti) | i=1,2..., m }； (5)
Obtain the second data acquisition system p being made up of photovoltaic power generation power prediction value2:
p2={ (p2i,ti) | i=1,2..., m }； (6)
By described first data acquisition system p1In Wind power forecasting value and described second data acquisition system p2In photovoltaic generation
Power prediction value obtains by the scene synthetic data set p that always generated power forecasting value forms after being added:
P={ (pi,ti) | i=1,2..., m }； (7)
Wherein, pi=p1i+p2i；
Wherein, p1For the first data acquisition system, p1iFor Wind power forecasting value, p2For the second data acquisition system, p2iSend out for wind-force
Electrical power predictive value, p is synthetic data set, piFor the total generated power forecasting value of scene, m is the first data acquisition system, the second number
According to the number of samples of set, the 3rd data acquisition system, m is natural number, and i is sample sequence number, tiFor p1i、p2i、piThe corresponding time；
Described step s52 specifically includes:
S521. according to total generated power forecasting value p of scene in described synthetic data set piFluctuation tendency, determine described smooth
Exert oneself the exponent number n of formula, and wherein n is natural number；
S522. matching has a multinomial of described exponent number n:
anti n+an-1ti n-1+…+a1ti+a0； (8)
Wherein, a0～anFor multinomial coefficient；
Step b3, calculates described multinomial anti n+an-1ti n-1+…+a1ti+a0Total generated power forecasting value p with described scenei's
Squared difference and err:
When s522. utilizing method of least square to calculate described squared difference and err for minima, multinomial coefficient a0～anCorresponding
Occurrence α0～αn；
S523. utilize described occurrence α0～αnBuild and smooth formula x (t) of exerting oneself:
X (t)=αntn+αn-1tn-1+…+α1t+α0； (10)
Wherein, t is the time；
Described s53 particularly as follows:
Calculate and work as t=tiWhen, the value x (t of described smooth formula x (t) of exerting oneselfi):
x(ti)=αnti n+αn-1ti n-1+…+α1ti+α0(11)
Wherein, x (ti) for smoothing output valve of exerting oneself；
Described step s54 specifically includes:
As the described smooth output valve x (t that exerts oneselfi) more than total generated power forecasting value p of described sceneiWhen, energy-storage system release electricity
Can, and power output value is:
p′i=x (ti)-pi=(αnti n+αn-1ti n-1+…+α1ti+α0)-pi(12)
Wherein, p 'iFor tiThe power output value of moment energy-storage system；
As the described smooth output valve x (t that exerts oneselfi) less than total generated power forecasting value p of described sceneiWhen, energy-storage system absorbs electricity
Can, and power output value is:
p′i=pi-x(ti)=pi-(αnti n+αn-1ti n-1+…+α1ti+α0)； (13)
As the described smooth output valve x (t that exerts oneselfi) it is equal to total generated power forecasting value p of described sceneiWhen, energy-storage system power output
Value is zero.
2. micro-capacitance sensor as claimed in claim 1 is it is characterised in that photovoltaic power generation equipment monitoring module at least includes photovoltaic generation
Equipment voltage, current detecting equipment, light intensity and temperature testing equipment.
3. micro-capacitance sensor as claimed in claim 2 is it is characterised in that described photovoltaic power generation equipment monitoring module obtains photovoltaic in real time
The service data of generating equipment, and data storage.
4. micro-capacitance sensor as claimed in claim 3 is it is characterised in that described wind power plant monitoring module at least includes wind-force
Generating equipment voltage, electric current and frequency detection equipment, wind speed measurement equipment.
5. micro-capacitance sensor as claimed in claim 4 is it is characterised in that described wind power plant monitoring module obtains wind-force in real time
The service data of generating equipment, and data storage.
6. micro-capacitance sensor as claimed in claim 5 is it is characterised in that energy-storage system monitoring module at least includes accumulator terminal electricity
Pressure, electric current, soc obtain equipment and temperature testing equipment.
7. micro-capacitance sensor as claimed in claim 6 is it is characterised in that described soc acquisition equipment includes: the first acquisition module, uses
In the working condition obtaining battery；First determining module, determines for estimating battery charge for the working condition according to battery
The evaluation method of state；Computing module, is in the battery lotus under different working conditions for calculating battery according to evaluation method
Electricity condition value.
8. micro-capacitance sensor as claimed in claim 7 is it is characterised in that the first determining module includes: the first determination sub-module, is used for
In the case that the working condition getting is resting state, determine that evaluation method is the first evaluation method, wherein, the first estimation
Method includes open circuit voltage method；Second determination sub-module, in the case of being recovery state in the working condition getting, really
Determining evaluation method is the second evaluation method；3rd determination sub-module, for being charging and discharging state in the working condition getting
In the case of, determine that evaluation method is the 3rd evaluation method, wherein, the 3rd evaluation method includes Kalman filtering method.
9. micro-capacitance sensor as claimed in claim 8 is it is characterised in that battery module adopts lithium battery as the base of power storage
Plinth unit.
10. micro-capacitance sensor as claimed in claim 9 is it is characterised in that described battery module, including n set of cells, described double
To dc/dc changer, there is n dc/dc current transformer, n is more than or equal to 3, and each set of cells is controlled by a dc/dc current transformer
Device discharge and recharge, this n dc/dc current transformer is controlled by energy-storage system monitoring module.
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| CN109991470A (en) * | 2019-02-22 | 2019-07-09 | 中国电力科学研究院有限公司 | A kind of determination method and system of string type photovoltaic DC-to-AC converter transfer efficiency |
| CN111900743B (en) * | 2020-07-28 | 2021-11-16 | 南京东博智慧能源研究院有限公司 | Wind power frequency modulation potential prediction error distribution estimation method |
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