CN103887807A  Offgrid control method of microgrid energy storage device based on power prediction  Google Patents
Offgrid control method of microgrid energy storage device based on power prediction Download PDFInfo
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 CN103887807A CN103887807A CN201410063844.0A CN201410063844A CN103887807A CN 103887807 A CN103887807 A CN 103887807A CN 201410063844 A CN201410063844 A CN 201410063844A CN 103887807 A CN103887807 A CN 103887807A
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 Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSSSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSSREFERENCE 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 CROSSSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSSREFERENCE 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 nonfossil origin
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Abstract
The invention relates to an offgrid control method of a microgrid energy storage device based on power prediction and adopts a doubleloop control strategy. The control of the storage battery adopts voltage to control an external loop and adopts current to control the internal loop; the control of a super capacitor adopts power to control the external loop and adopts the current to control the internal loop. Photovoltaic output power PV and load power PL of different times in a day are determined according to a power prediction curve; a difference value signal P delta of the output power PV and the load power PL is calculated; a DB9 wavelet packet decomposition method is adopted to perform decomposition on the difference value signal P delta to obtain a high frequency part signals Phigh and low frequency part signals Plow; the low frequency part signals Plow is complimented by the output power of the storage battery; and the high frequency part signals Phigh is complimented by the super capacitor output power.
Description
Technical field
The invention belongs to microelectrical network and generation of electricity by new energy technical field, relate to a kind of microelectrical network energy storage device based on power prediction from network control method.
Background technology
Because the development of the control strategy of microelectrical network and application are in the starting stage, still immature, can not ensure fail safe, the reliability and stability of microoperation of power networks, development and the widespread adoption of microelectrical network and new forms of energy are hindered greatly, need further to improve and explore, present stage makes full use of microelectrical network energy storage deviceand the operation of storage battery and the microelectrical network of ultracapacitor control becomes a direction of microelectrical network research.Super capacitor has the advantages that power density is large, service life cycle is long, the charging interval is short, reliability is high, energy density is low, and storage battery energy density is large, capacity energy storage greatly, but be not suitable for frequently charging and discharging.These two kinds of energy storage devices, in conjunction with being applied to the method that makes its mutual supplement with each other's advantages in micropower grid control, because also not having combination, are applied technical reason.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind ofly can stabilize power fluctuation, burning voltage, guarantee load has safe and reliable electric power supply, and can extend energy storage device useful life, give full play to different energy storage device characteristics the microelectrical network energy storage device based on power prediction from network control method.
For solve the problems of the technologies described above taked technical scheme be a kind of microelectrical network energy storage device based on power prediction from network control method, described microelectrical network comprises photovoltaic cell component, the 3rd inverter, the 3rd inlet wire inductance L 3, feeder line C, control device, data acquisition unit, energy storage device, load system, gridconnected switch and ac bus; Described energy storage device comprises storage battery, ultracapacitor, the first to second inverter, the first to second inlet wire inductance L 1L2 and feeder line AB; Described load system comprises a type load, two type loads, K switch 1K2 and feeder line D; Described photovoltaic cell component connects described ac bus through described the 3rd inverter, the 3rd inlet wire inductance L 3, feeder line C successively; Described storage battery connects described ac bus through described the first inverter, the first inlet wire inductance L 1, feeder line A successively; Described ultracapacitor connects described ac bus through described the second inverter, the second inlet wire inductance L 2, feeder line B successively; A described type load connects described ac bus through described K switch 1, feeder line D successively; Described two type loads connect described ac bus through described K switch 2, feeder line D successively; Described ac bus gets access to grid through described gridconnected switch; The datasignal input of described data acquisition unit meets respectively described feeder line A, feeder line B, feeder line C and feeder line D; The input of control device described in the datasignal output termination of described data acquisition unit; The control signal output of described control device connects respectively the corresponding control signal input of the described first to the 3rd inverter and K switch 1K2; Comprise the steps: from network control method
Step 2, according to fine day photovoltaic power prediction curve and load power prediction curve, cloudy photovoltaic power prediction curve and load power prediction curve and cloudy photovoltaic power prediction curve and load power prediction curve, is determined the photovoltaic power output P in each moment in one day
_{v}with load power P
_{l}; Calculate the difference signal P of the two
_{△};
Step 3 adopts DB9 WAVELET PACKET DECOMPOSITION method to described difference signal P
_{△}carry out the decomposition of j layer, by described difference signal P
_{△}be mapped in m wavelet packet subspace and through reconstruct, obtain described difference signal P
_{△}hFS signal P
_{high}with low frequency part signal P
_{low}; Described j=8, m=2
^{8};
Low frequency part signal P described in step 4
_{low}the power of being exported by described storage battery compensates; Described HFS signal P
_{high}the active power of being exported by described ultracapacitor compensates;
Concrete grammar is as follows:
Adopt Doubleloop Control Strategy: the control of described storage battery adopts the method for ring in voltage control outer shroud, Current Control; The control of described ultracapacitor adopts the method for ring system in power control outer shroud, electric current control;
If storage battery power is P
_{b}; Ultracapacitor power is P
_{e}; Load power is P
_{l}; , storage battery charge state value is SOC
_{b}; Storage battery charge state maximum is SOC
_{bMAX}, described SOC
_{bMAX}the stateofcharge value that storage battery allows to be converted into by charged state discharge condition, SOC
_{bMAX}=0.8; Storage battery charge state minimum value is SOC
_{bMIN}, described SOC
_{bMIN}the stateofcharge value that storage battery allows to be converted into by discharge condition charged state, SOC
_{bMIN}=0.2; When electric discharge, the critical detected value of storage battery charge state is SOC
_{bLF}, represent when battery discharging, when stateofcharge is less than this critical detected value, need to detect storage battery whether store enough electric energy can ensure to load power, described SOC
_{bLF}be set to 0.4; When charging, the critical detected value of storage battery charge state is SOC
_{bLC}, described SOC
_{bLC}represent that stateofcharge is greater than this critical detected value in the time of charge in batteries, need to detect storage battery and whether can store the unnecessary electric energy except load use that photovoltaic electromotive power output produces, described SOC
_{bLC}be set to 0.6; The stateofcharge value of ultracapacitor is SOC
_{edlc}; The energy that current time storage battery can provide is E
_{b01}, E
_{b01=}1.2 (SOC
_{b}SOC
_{bMIN}) E
_{b}, wherein 1.2 is due to the error factor that exists photovoltaic power output predicated error to set, E
_{b}the gross energy that can store for storage battery; The energy that current time storage battery can store is E
_{b02}, E
_{b02}=1.2 (SOC
_{bMAX}SOC
_{b}) E
_{b}, wherein 1.2 is due to the error factor that exists photovoltaic power predicated error to set; Photovoltaic power output P
_{v}with load power P
_{l}energy difference be E
_{t0},
, wherein 1.2 is due to the error factor that exists photovoltaic power output predicated error to set;
(1) work as 0<P
_{v}≤ P
_{l}, SOC
_{b}≤ SOC
_{bLF}, i
_{b}>=0,0.2<SOC
_{edlc}when <0.85, as photovoltaic power output P
_{v}be less than or equal to load power P
_{l}, storage battery charge state SOC
_{b}be less than SOC
_{bLF}, and storage battery is in electric discharge or the not discharge condition of not charging also, the stateofcharge value SOC of ultracapacitor
_{edlc}in normal range (NR) time; If E
_{b}< E
_{t0}, microelectrical network cutout two type loads of control device control, make the P that loads
_{l}reduce, control ultracapacitor simultaneously and absorb the fluctuation of photovoltaic power output high frequency power, absorb described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high}; If E
_{b}>E
_{t0}, control device control ultracapacitor absorbing highfrequency power fluctuation, absorbs described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high}, lowfrequency fluctuation is described difference P
_{△}the low frequency part signal P of signal
_{low}compensated by storage battery;
(2) work as P
_{v}>P
_{l}, SOC
_{b}>SOC
_{bMIN}, i
_{b}>=0,0.2<SOC
_{edlc}when <0.85, i.e. photovoltaic power output P
_{v}be greater than load power P
_{l}, storage battery charge state is greater than minimum value, and storage battery is in electric discharge or the not discharge condition of not charging also, ultracapacitor stateofcharge is in normal range (NR), control device judges that whether the load of microelectrical network all drops into, if described load does not all drop into, increases load; If described load all drops into, control device control the 3rd inverter reduces the output of photovoltaic power;
(3) work as P
_{v}>P
_{l}, SOC
_{b}≤ SOC
_{bMIN}, i
_{b}>=0,0.2<SOC
_{edlc}when <0.85, i.e. photovoltaic power output P
_{v}be greater than load power P
_{l}, storage battery charge state is not more than minimum value, and storage battery is in electric discharge or the not discharge condition of not charging also, and ultracapacitor stateofcharge is in normal range (NR), and control device control ultracapacitor absorbing highfrequency power fluctuation, absorbs described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high}, lowfrequency fluctuation is described difference signal P
_{△}low frequency part signal P
_{low}absorbed by storage battery;
(4) work as P
_{v}> P
_{l}, SOC
_{bMIN}< SOC
_{b}< SOC
_{bLC}, i
_{b}< 0,0.2 < SOC
_{edlc}when < 0.85, i.e. photovoltaic power output P
_{v}be greater than load power P
_{l}, storage battery charge state value is greater than storage battery charge state minimum value and is less than the critical detected value SOC of storage battery charge state while charging
_{bLC}, storage battery is in charged state, and ultracapacitor stateofcharge value is in normal range (NR), and control device control ultracapacitor absorbs the fluctuation of photovoltaic power high frequency power, absorbs described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high}, lowfrequency fluctuation is described difference signal P
_{△}low frequency part signal P
_{low}absorbed by storage battery;
(5) work as P
_{v}> P
_{l}, SOC
_{bLC}≤ SOC
_{b}< SOC
_{bMAX}, i
_{b}< 0,0.2 < SOC
_{edlc}when < 0.85, i.e. photovoltaic power output P
_{v}be greater than load power P
_{l}, the critical detected value SOC of storage battery charge state when storage battery charge state value is greater than charging
_{bLC}, storage battery is in charged state, and ultracapacitor stateofcharge is in normal range (NR); If E
_{b02}>=E
_{t0}, control device control ultracapacitor absorbs the fluctuation of photovoltaic power high frequency power, absorbs described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high}, lowfrequency fluctuation is described difference signal P
_{△}low frequency part signal P
_{low}absorbed by storage battery; If E
_{b02}<E
_{t0}, control device control microelectrical network increase load or control the 3rd inverter reduce photovoltaic power output, control ultracapacitor absorption photovoltaic power high frequency power simultaneously and fluctuate, and absorb described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high};
(6) work as P
_{v}> P
_{l}, SOC
_{b}>=SOC
_{bMAX}, i
_{b}< 0,0.2 < SOC
_{edlc}when < 0.85, i.e. photovoltaic power output P
_{v}be greater than load power P
_{l}, storage battery charge state value is greater than storage battery charge state maximum SOC
_{bMAX}, storage battery is in charged state, and ultracapacitor stateofcharge is in normal range (NR); Judge the whether all microelectrical network of access of load by data acquisition unit and control device, if load does not all access microelectrical network, increase the load of the microelectrical network of access, if all accesses, control device control the 3rd inverter reduces photovoltaic power output, make ultracapacitor absorb the fluctuation of photovoltaic power high frequency power simultaneously, absorb described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high};
(7) as 0 < P
_{v}≤ P
_{l}, SOC
_{bLC}≤ SOC
_{b}< SOC
_{bMAX}, i
_{b}< 0,0.2 < SOC
_{edlc}when < 0.85, i.e. photovoltaic power output P
_{v}be less than or equal to load power P
_{l}, the critical detected value SOC of storage battery charge state when storage battery charge state value is greater than charging
_{bLC}, and storage battery is in charged state, and ultracapacitor stateofcharge is in normal range (NR); Judge that by data acquisition unit and control device whether photovoltaic DCtoAC converter is with maximum power output, if photovoltaic power is not with maximum power output, first consider that controlling the 3rd inverter increases photovoltaic power output; If photovoltaic power has been maximum, the microelectrical network of control device control excises two type loads, makes ultracapacitor absorb the fluctuation of photovoltaic power high frequency power simultaneously, absorbs described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high};
(8) as 0 < P
_{v}≤ P
_{l}, SOC
_{bLC}>=SOC
_{bMAX}, i
_{b}< 0,0.2 < SOC
_{edlc}when < 0.85, i.e. photovoltaic power output P
_{v}be less than or equal to load power P
_{l}, storage battery charge state value is more than or equal to storage battery charge state maximum, and storage battery is in charged state, and ultracapacitor stateofcharge is in normal range (NR); Control device control ultracapacitor compensation photovoltaic power high frequency power fluctuation, absorbs described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high}, lowfrequency fluctuation is described difference signal P
_{△}low frequency part signal P
_{low}compensated by battery discharging;
(9) work as P
_{v}=0 o'clock, photovoltaic cell stopped generating; If i
_{b}>=0, SOC
_{edlc}>=0.85, storage battery is noncharged state, and ultracapacitor stateofcharge is greater than maximum, P
_{e}=P
_{l}, powered to load by storage battery; If i
_{b}>=0, SOC
_{edlc}<0.85, detects storage battery charge state, in two kinds of situation: if SOC
_{b}>SOC
_{bMIN},
; If SOC
_{b}≤ SOC
_{bMIN}if closed gridconnected switch is incorporated into the power networks or can not in time gridconnectedly disconnects all loads;
(10) work as P
_{v}=0, i
_{b}≤ 0, SOC
_{b}> SOC
_{bMIN}time, when photovoltaic cell stops generating, storage battery is in charging or do not fill not discharge condition, and storage battery charge state value is between storage battery charge state maximum and storage battery charge state minimum value; If SOC
_{edlc}>=0.85, ultracapacitor stateofcharge value is more than or equal to maximum 0.85, P
_{e}=P
_{l}; If SOC
_{edlc}< 0.85, ultracapacitor stateofcharge is less than maximum 0.85, now controls P
_{e}=0, powered to load by storage battery;
(11) in the time that condition does not meet the condition of described (1) to (10), micropower grid control device control overhead K switch 1K2, disconnects load and microelectrical network, or takes gridconnected measure, by described gridconnected switch connection, power to load by the mode of being incorporated into the power networks.
The outer shroud voltage control that the control of described storage battery adopts, the method for interior circular current control are as follows:
(1) gather the ac voltage U of feeder line A place by the voltage transformer of data acquisition unit
_{b}, by described ac voltage U
_{b}the input R1 of input storage battery pressurecontrolled outer shroud;
(2) by described ac voltage U
_{b}carry out Park conversion, obtain direct axis component voltage U
_{bd}with quadrature axis component voltage U
_{bq};
(3) by described direct axis component voltage U
_{bd}with the given busbar voltage U of daxis
_{bd_ref}do subtraction, carry out difference comparison, obtain algebraic operation difference △ U
_{bd}; By described quadrature axis component voltage U
_{bq}with the given busbar voltage U of quadrature axis
_{bq_ref}do subtraction, carry out difference comparison, obtain algebraic operation difference △ U
_{bq};
(4) by described difference △ U
_{bd}with difference △ U
_{bq}after input ratio integral element PI, then by Parker inverse transformation, obtain the given current i of ring in storage battery current control
_{b_ref};
(5) by the given current i of encircling in described storage battery current control
_{b_ref}the input R2 of ring in input storage battery current control, the output output AC current i of ring in described storage battery current control
_{b};
(6) described alternating current i
_{b}through inlet wire inductance, 1/L1S obtains voltage U
_{b}, feed back to the input R1 of described storage battery pressurecontrolled outer shroud;
(7) the interior circular current control method of described storage battery is by described current i
_{b}with described given current i
_{b_ref}do subtraction, obtain △ I
_{b}, described △ I
_{b}after filtering after link, amplitude limit link, input PWM generator, the output signal of described PWM generator is inputted the first inverter as the triggering signal of the first inverter, and described the first inverter regulates the size of alternating current according to triggering signal, thereby completes the control of interior circular current.
The exterior ring power control that the control of described ultracapacitor adopts, the method for interior circular current control are as follows:
(1) described exterior ring power control gathers the alternating voltage U at feeder line B place by the voltage transformer summation current transformer of data acquisition unit
_{e}with alternating current I
_{e}, by described alternating voltage U
_{e}with alternating current I
_{e}input respectively voltage signal input R3 and the current signal input R4 of ultracapacitor power control outer shroud;
(2) by described ac voltage U
_{e}with alternating current flow valuve I
_{e}carry out Park conversion, obtain respectively directaxis voltage component U
_{ed}, directaxis current component I
_{ed}with quadratureaxis voltage component U
_{eq}, quadrature axis current component I
_{eq};
(3) described directaxis voltage component U
_{ed}, directaxis current component I
_{ed}multiply each other and obtain the activepower P of described ultracapacitor through multiplier
_{e}; Described quadratureaxis voltage component U
_{eq}, quadrature axis current component I
_{eq}multiply each other and obtain the reactive power Q of described ultracapacitor through multiplier
_{e};
(4) by described activepower P
_{e}with given activepower P
_{e_ref}do subtraction, carry out difference comparison, obtain algebraic operation difference DELTA P
_{e}; By described reactive power Q
_{e}with given reactive power Q
_{e_ref}do subtraction, carry out difference comparison, obtain algebraic operation difference DELTA Q
_{e};
(5) by described difference DELTA P
_{e}with difference DELTA Q
_{e}after input ratio integral element PI, then by Park inverse transformation, obtain the given current i of ring in ultracapacitor Current Control
_{e_ref};
(6) by the given current i of encircling in described ultracapacitor Current Control
_{e_ref}input the input R5 of ring in described ultracapacitor Current Control, the output output AC electric current I of ring in described ultracapacitor Current Control
_{e}; Described alternating current I
_{e}feed back to the current signal input R4 of described ultracapacitor power control outer shroud;
(7) the interior circular current control method of described ultracapacitor is to be that alternating current is I by the average anode current of ultracapacitor through the second inverter inversion
_{e}, by alternating current I
_{e}with the given current i of encircling in ultracapacitor Current Control
_{e_ref}do subtraction and obtain difference △ I
_{e}, △ I
_{e}after link, amplitude limit link, be input to PWM generator after filtering, the output signal of described PWM generator is inputted the second inverter as the triggering signal of the second inverter, described the second inverter regulates the size of alternating current according to triggering signal, thereby completes the control of circular current in ultracapacitor.
The invention has the beneficial effects as follows: (1) adopts powertype energy storage device ultracapacitor and energy type energy storage device storage battery as energy storage device, super capacitor has the advantages that power density is large, service life cycle is long, the charging interval is short, reliability is high, energy density is low, and storage battery energy density is large, capacity energy storage greatly, but be not suitable for frequently discharging and recharging.By selecting rationally effectively Coordinated Control Scheme, make ultracapacitor and storage battery power output with load variations constantly adjust, cooperation, can give full play to the advantage of these two kinds of energy storage devices, power fluctuation is stabilized in realization, maintain microNetwork Voltage Stability, ensure the target of power grid operation.(2) predict by photovoltaic power and load power prediction curve, can predict the demand of exerting oneself of energy storage device.(3) ensure that energy storage device has enough nargin to realize the control target of stabilizing power fluctuation, burning voltage, ensure that load has safe and reliable electric power supply.(4) can extend energy storage device useful life, give full play to the characteristic of different energy storage devices, avoid overcharging, cross and put phenomenon.(5) be conducive to the raising of microelectrical network quality of power supply, promote micropower grid security reliability service.
Brief description of the drawings
Fig. 1 is microelectric network composition schematic diagram;
Fig. 2 is storage battery outer shroud voltage control method schematic diagram of the present invention;
Fig. 3 is circular current control method schematic diagram in storage battery of the present invention;
Fig. 4 is ultracapacitor outerloop power controlling method schematic diagram of the present invention;
Fig. 5 is circular current control method schematic diagram in ultracapacitor of the present invention;
Fig. 6 is control method flow chart of the present invention;
Fig. 7 is fine day photovoltaic power and load power prediction curve;
Fig. 8 is cloudy weather photovoltaic power and load power prediction curve;
Fig. 9 is cloudy photovoltaic power and load power prediction curve;
Figure 10 is for being three layers of WAVELET PACKET DECOMPOSITION schematic diagram.
Embodiment
Below in conjunction with Fig. 19 and embodiment, the present invention is done to following explanation.
Micronet capacity that the present invention uses configures and is, photovoltaic maximum power is 150KW, and battery capacity is 250KW/2h, and capacity of super capacitor is 100KW/10s.
Described microelectrical network comprises photovoltaic cell component, the 3rd inverter, the 3rd inlet wire inductance L 3, feeder line C, control device, data acquisition unit, energy storage device, load system, gridconnected switch and ac bus; Described energy storage device comprises storage battery, ultracapacitor, the first to second inverter, the first to second inlet wire inductance L 1L2 and feeder line AB; Described load system comprises a type load, two type loads, K switch 1K2 and feeder line D; Described photovoltaic cell component connects described ac bus through described the 3rd inverter, the 3rd inlet wire inductance L 3, feeder line C successively; Described storage battery connects described ac bus through described the first inverter, the first inlet wire inductance L 1, feeder line A successively; Described ultracapacitor connects described ac bus through described the second inverter, the second inlet wire inductance L 2, feeder line B successively; A described type load connects described ac bus through described K switch 1, feeder line D successively; Described two type loads connect described ac bus through described K switch 2, feeder line D successively; Described ac bus gets access to grid through described gridconnected switch; The datasignal input of described data acquisition unit meets respectively described feeder line A, feeder line B, feeder line C and feeder line D; The input of control device described in the datasignal output termination of described data acquisition unit; The control signal output of described control device connects respectively the corresponding control signal input of the described first to the 3rd inverter and K switch 1K2; Comprise the steps: from network control method
Step 2, according to fine day photovoltaic power prediction curve and load power prediction curve, cloudy photovoltaic power prediction curve and load power prediction curve and cloudy photovoltaic power prediction curve and load power prediction curve, is determined the photovoltaic power output P in each moment in one day
_{v}with load power P
_{l}; Calculate the difference signal P of the two
_{△};
The feature of lighting load is that 5 o'clock to 8 o'clock morning and ten seven o'clock to 24 are load boom periods, and lighting load peak value is 50KW, the motor load operating time be at 8 in the morning to point in evenings six, maximum power is 100KW.The feature of photovoltaic power output be 5 o'clock to 8 o'clock morning power stage very little and also ten seven after power outputs be decreased to gradually 0, generated output peak value is ten two points at noon, photovoltaic power maximum of the present invention is output as 150KW, and Fig. 7 is fine day photovoltaic power and load power prediction curve; Fig. 8 is cloudy weather photovoltaic power and load power prediction curve; Fig. 9 is cloudy photovoltaic power and load power prediction curve.
Step 3 adopts DB9 WAVELET PACKET DECOMPOSITION method to described difference signal P
_{△}carry out the decomposition of j layer, by described difference signal P
_{△}be mapped in m wavelet packet subspace and through reconstruct, obtain described difference signal P
_{△}hFS signal P
_{high}with low frequency part signal P
_{low}; Described j=8, m=2
^{8};
The present invention adopts WAVELET PACKET DECOMPOSITION method to process signal, and WAVELET PACKET DECOMPOSITION method is developed by small wave converting method, is a kind of meticulousr decomposition method, has improved time frequency resolution.In the present invention, adopt WAVELET PACKET DECOMPOSITION method to process the difference of photovoltaic power output signal and micronetwork load power, obtain HFS signal and the low frequency part signal of this difference signal, and then use respectively storage battery and ultracapacitor to compensate.
This algorithm is mapped to difference signal in m wavelet packet subspace, and decomposition algorithm is:
； （1）
Restructing algorithm is:
If Figure 10 is three layers of WAVELET PACKET DECOMPOSITION schematic diagram, wherein S represents processed primary signal, S
_{j,i}for the signal of different frequency, wherein j is for decomposing the number of plies, and i is wavelet packet space numbering, and the present embodiment adopts the power output predicted value P of DB9 small echo to photovoltaic cell component
_{v}with micronetwork load power prediction value P
_{l}signal difference P
_{△}decompose, the decomposition number of plies is j=8, m=2
^{8}individual wavelet packet space, the signal S of acquisition different frequency
_{8, i}(i=0,1,2,3 ..., 255);
The present invention adopts DB9 small echo to carry out eight layers of decomposition to photovoltaic power output and micronetwork load power signal difference, and the decomposition number of plies is j=8, m=2
^{8}individual wavelet packet space, the signal S of acquisition different frequency
_{8, i}(i=0,1,2,3 ..., 255).It is 2h that the present invention selects the battery response time, and its response frequency is
hz, with the S obtaining after WAVELET PACKET DECOMPOSITION
_{8,0}to S
_{8,4}inferior highfrequency signal response frequency is close, because energystorage battery energy density is high, power density is low, service life cycle is low, therefore selects battery energy storage system to stabilize S
_{8,0}to S
_{8,4}this band frequency signal, S
_{8,0}to S
_{8,4}band frequency signal is obtained as low frequency signal P through reconstruct by formula (4)
_{low}; Ultracapacitor power density is high, cycle life is high, energy density is low, remaining highfrequency signal S
_{8,5}to S
_{8,255}and do not compensated highfrequency signal S by ultracapacitor by battery absorption portion
_{8,5}to S
_{8,255}obtain P by formula (4) through reconstruct
_{high}.The object of photovoltaic power fluctuation is stabilized in realization.
Low frequency part signal P described in step 4
_{low}the power of being exported by described storage battery compensates; Described HFS signal P
_{high}the active power of being exported by described ultracapacitor compensates;
Concrete grammar is as follows: the control from energy storage device under net pattern adopts Doubleloop Control Strategy; The control of described storage battery adopts the method for ring in voltage control outer shroud, Current Control; The control of described ultracapacitor adopts the method for ring system in power control outer shroud, electric current control;
If storage battery power is P
_{b}; Ultracapacitor power is P
_{e}; Load power is P
_{l}; , storage battery charge state value is SOC
_{b}; Storage battery charge state maximum is SOC
_{bMAX}, described SOC
_{bMAX}the stateofcharge value that storage battery allows to be converted into by charged state discharge condition, SOC
_{bMAX}=0.8; Storage battery charge state minimum value is SOC
_{bMIN}, described SOC
_{bMIN}the stateofcharge value that storage battery allows to be converted into by discharge condition charged state, SOC
_{bMIN}=0.2; When electric discharge, the critical detected value of storage battery charge state is SOC
_{bLF}, represent when battery discharging, when stateofcharge is less than this critical detected value, need to detect storage battery whether store enough electric energy can ensure to load power, described SOC
_{bLF}be set to 0.4; When charging, the critical detected value of storage battery charge state is SOC
_{bLC}, described SOC
_{bLC}represent that stateofcharge is greater than this critical detected value in the time of charge in batteries, need to detect storage battery and whether can store the unnecessary electric energy except load use that photovoltaic electromotive power output produces, described SOC
_{bLC}be set to 0.6; The stateofcharge value of ultracapacitor is SOC
_{edlc}; The energy that current time storage battery can provide is E
_{b01}, E
_{b01=}1.2 (SOC
_{b}SOC
_{bMIN}) E
_{b}, wherein 1.2 is due to the error factor that exists photovoltaic power output predicated error to set, E
_{b}the gross energy that can store for storage battery; The energy that current time storage battery can store is E
_{b02}, E
_{b02}=1.2 (SOC
_{bMAX}SOC
_{b}) E
_{b}, wherein 1.2 is due to the error factor that exists photovoltaic power predicated error to set; Photovoltaic power output P
_{v}with load power P
_{l}energy difference be E
_{t0},
, wherein 1.2 is due to the error factor that exists photovoltaic power output predicated error to set;
(1) work as 0<P
_{v}≤ P
_{l}, SOC
_{b}≤ SOC
_{bLF}, i
_{b}>=0,0.2<SOC
_{edlc}when <0.85, as photovoltaic power output P
_{v}be less than or equal to load power P
_{l}, storage battery charge state SOC
_{b}be less than SOC
_{bLF}, and storage battery is in electric discharge or the not discharge condition of not charging also, the stateofcharge value SOC of ultracapacitor
_{edlc}in normal range (NR) time; If E
_{b}< E
_{t0}, microelectrical network cutout two type loads of control device control, make the P that loads
_{l}reduce, control ultracapacitor simultaneously and absorb the fluctuation of photovoltaic power output high frequency power, absorb described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high}; If E
_{b}>E
_{t0}, control device control ultracapacitor absorbing highfrequency power fluctuation, absorbs described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high}, lowfrequency fluctuation is described difference P
_{△}the low frequency part signal P of signal
_{low}compensated by storage battery;
(2) work as P
_{v}>P
_{l}, SOC
_{b}>SOC
_{bMIN}, i
_{b}>=0,0.2<SOC
_{edlc}when <0.85, i.e. photovoltaic power output P
_{v}be greater than load power P
_{l}, storage battery charge state is greater than minimum value, and storage battery is in electric discharge or the not discharge condition of not charging also, ultracapacitor stateofcharge is in normal range (NR), control device judges that whether the load of microelectrical network all drops into, if described load does not all drop into, increases load; If described load all drops into, control device control the 3rd inverter reduces the output of photovoltaic power;
(3) work as P
_{v}>P
_{l}, SOC
_{b}≤ SOC
_{bMIN}, i
_{b}>=0,0.2<SOC
_{edlc}when <0.85, i.e. photovoltaic power output P
_{v}be greater than load power P
_{l}, storage battery charge state is not more than minimum value, and storage battery is in electric discharge or the not discharge condition of not charging also, and ultracapacitor stateofcharge is in normal range (NR), and control device control ultracapacitor absorbing highfrequency power fluctuation, absorbs described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high}, lowfrequency fluctuation is described difference signal P
_{△}low frequency part signal P
_{low}absorbed by storage battery;
(4) work as P
_{v}> P
_{l}, SOC
_{bMIN}< SOC
_{b}< SOC
_{bLC}, i
_{b}< 0,0.2 < SOC
_{edlc}when < 0.85, i.e. photovoltaic power output P
_{v}be greater than load power P
_{l}, storage battery charge state value is greater than storage battery charge state minimum value and is less than the critical detected value SOC of storage battery charge state while charging
_{bLC}, storage battery is in charged state, and ultracapacitor stateofcharge value is in normal range (NR), and control device control ultracapacitor absorbs the fluctuation of photovoltaic power high frequency power, absorbs described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high}, lowfrequency fluctuation is described difference signal P
_{△}low frequency part signal P
_{low}absorbed by storage battery;
(5) work as P
_{v}> P
_{l}, SOC
_{bLC}≤ SOC
_{b}< SOC
_{bMAX}, i
_{b}< 0,0.2 < SOC
_{edlc}when < 0.85, i.e. photovoltaic power output P
_{v}be greater than load power P
_{l}, the critical detected value SOC of storage battery charge state when storage battery charge state value is greater than charging
_{bLC}, storage battery is in charged state, and ultracapacitor stateofcharge is in normal range (NR); If E
_{b02}>=E
_{t0}, control device control ultracapacitor absorbs the fluctuation of photovoltaic power high frequency power, absorbs described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high}, lowfrequency fluctuation is described difference signal P
_{△}low frequency part signal P
_{low}absorbed by storage battery; If E
_{b02}<E
_{t0}, control device control microelectrical network increase load or control the 3rd inverter reduce photovoltaic power output, control ultracapacitor absorption photovoltaic power high frequency power simultaneously and fluctuate, and absorb described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high};
(6) work as P
_{v}> P
_{l}, SOC
_{b}>=SOC
_{bMAX}, i
_{b}< 0,0.2 < SOC
_{edlc}when < 0.85, i.e. photovoltaic power output P
_{v}be greater than load power P
_{l}, storage battery charge state value is greater than storage battery charge state maximum SOC
_{bMAX}, storage battery is in charged state, and ultracapacitor stateofcharge is in normal range (NR); Judge the whether all microelectrical network of access of load by data acquisition unit and control device, if load does not all access microelectrical network, increase the load of the microelectrical network of access, if all accesses, control device control the 3rd inverter reduces photovoltaic power output, make ultracapacitor absorb the fluctuation of photovoltaic power high frequency power simultaneously, absorb described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high};
(7) as 0 < P
_{v}≤ P
_{l}, SOC
_{bLC}≤ SOC
_{b}< SOC
_{bMAX}, i
_{b}< 0,0.2 < SOC
_{edlc}when < 0.85, i.e. photovoltaic power output P
_{v}be less than or equal to load power P
_{l}, the critical detected value SOC of storage battery charge state when storage battery charge state value is greater than charging
_{bLC}, and storage battery is in charged state, and ultracapacitor stateofcharge is in normal range (NR); Judge that by data acquisition unit and control device whether photovoltaic DCtoAC converter is with maximum power output, if photovoltaic power is not with maximum power output, first consider that controlling the 3rd inverter increases photovoltaic power output; If photovoltaic power has been maximum, the microelectrical network of control device control excises two type loads, makes ultracapacitor absorb the fluctuation of photovoltaic power high frequency power simultaneously, absorbs described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high};
(8) as 0 < P
_{v}≤ P
_{l}, SOC
_{bLC}>=SOC
_{bMAX}, i
_{b}< 0,0.2 < SOC
_{edlc}when < 0.85, i.e. photovoltaic power output P
_{v}be less than or equal to load power P
_{l}, storage battery charge state value is more than or equal to storage battery charge state maximum, and storage battery is in charged state, and ultracapacitor stateofcharge is in normal range (NR); Control device control ultracapacitor compensation photovoltaic power high frequency power fluctuation, absorbs described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high}, lowfrequency fluctuation is described difference signal P
_{△}low frequency part signal P
_{low}compensated by battery discharging;
(9) work as P
_{v}=0 o'clock, photovoltaic cell stopped generating; If i
_{b}>=0, SOC
_{edlc}>=0.85, storage battery is noncharged state, and ultracapacitor stateofcharge is greater than maximum, P
_{e}=P
_{l}, powered to load by storage battery; If i
_{b}>=0, SOC
_{edlc}<0.85, detects storage battery charge state, in two kinds of situation: if SOC
_{b}>SOC
_{bMIN},
; If SOC
_{b}≤ SOC
_{bMIN}if closed gridconnected switch is incorporated into the power networks or can not in time gridconnectedly disconnects all loads;
(10) work as P
_{v}=0, i
_{b}≤ 0, SOC
_{b}> SOC
_{bMIN}time, when photovoltaic cell stops generating, storage battery is in charging or do not fill not discharge condition, and storage battery charge state value is between storage battery charge state maximum and storage battery charge state minimum value; If SOC
_{edlc}>=0.85, ultracapacitor stateofcharge value is more than or equal to maximum 0.85, P
_{e}=P
_{l}; If SOC
_{edlc}< 0.85, ultracapacitor stateofcharge is less than maximum 0.85, now controls P
_{e}=0, powered to load by storage battery;
(11) in the time that condition does not meet the condition of described (1) to (10), micropower grid control device control overhead K switch 1K2, disconnects load and microelectrical network, or takes gridconnected measure, by described gridconnected switch connection, power to load by the mode of being incorporated into the power networks.
The control of described storage battery adopts the method for outer shroud voltage control, interior circular current control as follows:
(1) gather the ac voltage U of feeder line A place by the voltage transformer of data acquisition unit
_{b}, by described ac voltage U
_{b}the input R1 of input storage battery pressurecontrolled outer shroud;
(2) by described ac voltage U
_{b}carry out Park conversion, obtain direct axis component voltage U
_{bd}with quadrature axis component voltage U
_{bq};
(3) by described direct axis component voltage U
_{bd}with the given busbar voltage U of daxis
_{bd_ref}do subtraction, carry out difference comparison, obtain algebraic operation difference △ U
_{bd}; By described quadrature axis component voltage U
_{bq}with the given busbar voltage U of quadrature axis
_{bq_ref}do subtraction, carry out difference comparison, obtain algebraic operation difference △ U
_{bq};
(4) by described difference △ U
_{bd}with difference △ U
_{bq}after input ratio integral element PI, then by Park inverse transformation, obtain the given current i of ring in storage battery current control
_{b_ref};
(5) by the given current i of encircling in described storage battery current control
_{b_ref}the input R2 of ring in input storage battery current control, the output output AC current i of ring in described storage battery current control
_{b};
(6) described alternating current i
_{b}through inlet wire inductance, 1/L1S obtains voltage U
_{b}, feed back to the input R1 of described storage battery pressurecontrolled outer shroud;
(7) the interior circular current control method of described storage battery is by described current i
_{b}with described given current i
_{b_ref}do subtraction, obtain △ I
_{b}, described △ I
_{b}after filtering after link, amplitude limit link, input PWM generator, the output signal of described PWM generator is inputted the first inverter as the triggering signal of the first inverter, and described the first inverter regulates the size of alternating current according to triggering signal, thereby completes the control of interior circular current.
The control of described ultracapacitor adopts the method for exterior ring power control, interior circular current control as follows:
(1) described exterior ring power control gathers the alternating voltage U at feeder line B place by the voltage transformer summation current transformer of data acquisition unit
_{e}with alternating current I
_{e}, by described alternating voltage U
_{e}with alternating current I
_{e}input respectively voltage signal input R3 and the current signal input R4 of ultracapacitor power control outer shroud;
(2) by described ac voltage U
_{e}with alternating current flow valuve I
_{e}carry out Park conversion, obtain respectively directaxis voltage component U
_{ed}, directaxis current component I
_{ed}with quadratureaxis voltage component U
_{eq}, quadrature axis current component I
_{eq};
(3) described directaxis voltage component U
_{ed}, directaxis current component I
_{ed}multiply each other and obtain the activepower P of described ultracapacitor through multiplier
_{e}; Described quadratureaxis voltage component U
_{eq}, quadrature axis current component I
_{eq}multiply each other and obtain the reactive power Q of described ultracapacitor through multiplier
_{e};
(4) by described activepower P
_{e}with given activepower P
_{e_ref}do subtraction, carry out difference comparison, obtain algebraic operation difference DELTA P
_{e}; By described reactive power Q
_{e}with given reactive power Q
_{e_ref}do subtraction, carry out difference comparison, obtain algebraic operation difference DELTA Q
_{e};
(5) by described difference DELTA P
_{e}with difference DELTA Q
_{e}after input ratio integral element PI, then by Park inverse transformation, obtain the given current i of ring in ultracapacitor Current Control
_{e_ref};
(6) by the given current i of encircling in described ultracapacitor Current Control
_{e_ref}input the input R5 of ring in described ultracapacitor Current Control, the output output AC electric current I of ring in described ultracapacitor Current Control
_{e}; Described alternating current I
_{e}feed back to the current signal input R4 of described ultracapacitor power control outer shroud;
(7) the interior circular current control method of described ultracapacitor is to be that alternating current is I by the average anode current of ultracapacitor through the second inverter inversion
_{e}, by alternating current I
_{e}with the given current i of encircling in ultracapacitor Current Control
_{e_ref}do subtraction and obtain difference △ I
_{e}, △ I
_{e}after link, amplitude limit link, be input to PWM generator after filtering, the output signal of described PWM generator is inputted the second inverter as the triggering signal of the second inverter, described the second inverter regulates the size of alternating current according to triggering signal, thereby completes the control of circular current in ultracapacitor.
Claims (3)
1. the microelectrical network energy storage device based on power prediction is from a network control method, and described microelectrical network comprises photovoltaic cell component, the 3rd inverter, the 3rd inlet wire inductance L 3, feeder line C, control device, data acquisition unit, energy storage device, load system, gridconnected switch and ac bus; Described energy storage device comprises storage battery, ultracapacitor, the first to second inverter, the first to second inlet wire inductance L 1L2 and feeder line AB; Described load system comprises a type load, two type loads, K switch 1K2 and feeder line D; Described photovoltaic cell component connects described ac bus through described the 3rd inverter, the 3rd inlet wire inductance L 3, feeder line C successively; Described storage battery connects described ac bus through described the first inverter, the first inlet wire inductance L 1, feeder line A successively; Described ultracapacitor connects described ac bus through described the second inverter, the second inlet wire inductance L 2, feeder line B successively; A described type load connects described ac bus through described K switch 1, feeder line D successively; Described two type loads connect described ac bus through described K switch 2, feeder line D successively; Described ac bus gets access to grid through described gridconnected switch; The datasignal input of described data acquisition unit meets respectively described feeder line A, feeder line B, feeder line C and feeder line D; The input of control device described in the datasignal output termination of described data acquisition unit; The control signal output of described control device connects respectively the corresponding control signal input of the described first to the 3rd inverter and K switch 1K2; It is characterized in that comprising the steps:
Step 1 disconnects described gridconnected switch; Described onload switch is connected;
Step 2, according to fine day photovoltaic power prediction curve and load power prediction curve, cloudy photovoltaic power prediction curve and load power prediction curve and cloudy photovoltaic power prediction curve and load power prediction curve, is determined the photovoltaic power output P in each moment in one day
_{v}with load power P
_{l}; Calculate the difference signal P of the two
_{△};
Step 3 adopts DB9 WAVELET PACKET DECOMPOSITION method to described difference signal P
_{△}carry out the decomposition of j layer, by described difference signal P
_{△}be mapped in m wavelet packet subspace and through reconstruct, obtain described difference signal P
_{△}hFS signal P
_{high}with low frequency part signal P
_{low}; Described j=8, m=2
^{8};
Low frequency part signal P described in step 4
_{low}the power of being exported by described storage battery compensates; Described HFS signal P
_{high}the active power of being exported by described ultracapacitor compensates;
Concrete grammar is as follows:
Adopt Doubleloop Control Strategy: the control of described storage battery adopts the method for outer shroud voltage control, interior circular current control; The control of described ultracapacitor adopts the method for exterior ring power control, interior circular current control;
If storage battery power is P
_{b}; Ultracapacitor power is P
_{e}; Load power is P
_{l}; , storage battery charge state value is SOC
_{b}; Storage battery charge state maximum is SOC
_{bMAX}, described SOC
_{bMAX}the stateofcharge value that storage battery allows to be converted into by charged state discharge condition, SOC
_{bMAX}=0.8; Storage battery charge state minimum value is SOC
_{bMIN}, described SOC
_{bMIN}the stateofcharge value that storage battery allows to be converted into by discharge condition charged state, SOC
_{bMIN}=0.2; When electric discharge, the critical detected value of storage battery charge state is SOC
_{bLF}, represent when battery discharging, when stateofcharge is less than this critical detected value, need to detect storage battery whether store enough electric energy can ensure to load power, described SOC
_{bLF}be set to 0.4; When charging, the critical detected value of storage battery charge state is SOC
_{bLC}, described SOC
_{bLC}represent that stateofcharge is greater than this critical detected value in the time of charge in batteries, need to detect storage battery and whether can store the unnecessary electric energy except load use that photovoltaic electromotive power output produces, described SOC
_{bLC}be set to 0.6; The stateofcharge value of ultracapacitor is SOC
_{edlc}; The energy that current time storage battery can provide is E
_{b01}, E
_{b01=}1.2 (SOC
_{b}SOC
_{bMIN}) E
_{b}, wherein 1.2 is due to the error factor that exists photovoltaic power output predicated error to set, E
_{b}the gross energy that can store for storage battery; The energy that current time storage battery can store is E
_{b02}, E
_{b02}=1.2 (SOC
_{bMAX}SOC
_{b}) E
_{b}, wherein 1.2 is due to the error factor that exists photovoltaic power predicated error to set; Photovoltaic power output P
_{v}with load power P
_{l}energy difference be E
_{t0},
, wherein 1.2 is due to the error factor that exists photovoltaic power output predicated error to set;
(1) work as 0<P
_{v}≤ P
_{l}, SOC
_{b}≤ SOC
_{bLF}, i
_{b}>=0,0.2<SOC
_{edlc}when <0.85, as photovoltaic power output P
_{v}be less than or equal to load power P
_{l}, storage battery charge state SOC
_{b}be less than SOC
_{bLF}, and storage battery is in electric discharge or the not discharge condition of not charging also, the stateofcharge value SOC of ultracapacitor
_{edlc}in normal range (NR) time; If E
_{b}< E
_{t0}, microelectrical network cutout two type loads of control device control, make the P that loads
_{l}reduce, control ultracapacitor simultaneously and absorb the fluctuation of photovoltaic power output high frequency power, absorb described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high}; If E
_{b}>E
_{t0}, control device control ultracapacitor absorbing highfrequency power fluctuation, absorbs described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high}, lowfrequency fluctuation is described difference P
_{△}the low frequency part signal P of signal
_{low}compensated by storage battery;
(2) work as P
_{v}>P
_{l}, SOC
_{b}>SOC
_{bMIN}, i
_{b}>=0,0.2<SOC
_{edlc}when <0.85, i.e. photovoltaic power output P
_{v}be greater than load power P
_{l}, storage battery charge state is greater than minimum value, and storage battery is in electric discharge or the not discharge condition of not charging also, ultracapacitor stateofcharge is in normal range (NR), control device judges that whether the load of microelectrical network all drops into, if described load does not all drop into, increases load; If described load all drops into, control device control the 3rd inverter reduces the output of photovoltaic power;
(3) work as P
_{v}>P
_{l}, SOC
_{b}≤ SOC
_{bMIN}, i
_{b}>=0,0.2<SOC
_{edlc}when <0.85, i.e. photovoltaic power output P
_{v}be greater than load power P
_{l}, storage battery charge state is not more than minimum value, and storage battery is in electric discharge or the not discharge condition of not charging also, and ultracapacitor stateofcharge is in normal range (NR), and control device control ultracapacitor absorbing highfrequency power fluctuation, absorbs described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high}, lowfrequency fluctuation is described difference signal P
_{△}low frequency part signal P
_{low}absorbed by storage battery;
(4) work as P
_{v}> P
_{l}, SOC
_{bMIN}< SOC
_{b}< SOC
_{bLC}, i
_{b}< 0,0.2 < SOC
_{edlc}when < 0.85, i.e. photovoltaic power output P
_{v}be greater than load power P
_{l}, storage battery charge state value is greater than storage battery charge state minimum value and is less than the critical detected value SOC of storage battery charge state while charging
_{bLC}, storage battery is in charged state, and ultracapacitor stateofcharge value is in normal range (NR), and control device control ultracapacitor absorbs the fluctuation of photovoltaic power high frequency power, absorbs described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high}, lowfrequency fluctuation is described difference signal P
_{△}low frequency part signal P
_{low}absorbed by storage battery;
(5) work as P
_{v}> P
_{l}, SOC
_{bLC}≤ SOC
_{b}< SOC
_{bMAX}, i
_{b}< 0,0.2 < SOC
_{edlc}when < 0.85, i.e. photovoltaic power output P
_{v}be greater than load power P
_{l}, the critical detected value SOC of storage battery charge state when storage battery charge state value is greater than charging
_{bLC}, storage battery is in charged state, and ultracapacitor stateofcharge is in normal range (NR); If E
_{b02}>=E
_{t0}, control device control ultracapacitor absorbs the fluctuation of photovoltaic power high frequency power, absorbs described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high}, lowfrequency fluctuation is described difference signal P
_{△}low frequency part signal P
_{low}absorbed by storage battery; If E
_{b02}<E
_{t0}, control device control microelectrical network increase load or control the 3rd inverter reduce photovoltaic power output, control ultracapacitor absorption photovoltaic power high frequency power simultaneously and fluctuate, and absorb described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high};
(6) work as P
_{v}> P
_{l}, SOC
_{b}>=SOC
_{bMAX}, i
_{b}< 0,0.2 < SOC
_{edlc}when < 0.85, i.e. photovoltaic power output P
_{v}be greater than load power P
_{l}, storage battery charge state value is greater than storage battery charge state maximum SOC
_{bMAX}, storage battery is in charged state, and ultracapacitor stateofcharge is in normal range (NR); Judge the whether all microelectrical network of access of load by data acquisition unit and control device, if load does not all access microelectrical network, increase the load of the microelectrical network of access, if all accesses, control device control the 3rd inverter reduces photovoltaic power output, make ultracapacitor absorb the fluctuation of photovoltaic power high frequency power simultaneously, absorb described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high};
(7) as 0 < P
_{v}≤ P
_{l}, SOC
_{bLC}≤ SOC
_{b}< SOC
_{bMAX}, i
_{b}< 0,0.2 < SOC
_{edlc}when < 0.85, i.e. photovoltaic power output P
_{v}be less than or equal to load power P
_{l}, the critical detected value SOC of storage battery charge state when storage battery charge state value is greater than charging
_{bLC}, and storage battery is in charged state, and ultracapacitor stateofcharge is in normal range (NR); Judge that by data acquisition unit and control device whether photovoltaic DCtoAC converter is with maximum power output, if photovoltaic power is not with maximum power output, first consider that controlling the 3rd inverter increases photovoltaic power output; If photovoltaic power has been maximum, the microelectrical network of control device control excises two type loads, makes ultracapacitor absorb the fluctuation of photovoltaic power high frequency power simultaneously, absorbs described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high};
(8) as 0 < P
_{v}≤ P
_{l}, SOC
_{bLC}>=SOC
_{bMAX}, i
_{b}< 0,0.2 < SOC
_{edlc}when < 0.85, i.e. photovoltaic power output P
_{v}be less than or equal to load power P
_{l}, storage battery charge state value is more than or equal to storage battery charge state maximum, and storage battery is in charged state, and ultracapacitor stateofcharge is in normal range (NR); Control device control ultracapacitor compensation photovoltaic power high frequency power fluctuation, absorbs described difference signal P
_{△}hFS signal P
_{high}, P
_{e}=– P
_{high}, lowfrequency fluctuation is described difference signal P
_{△}low frequency part signal P
_{low}compensated by battery discharging;
(9) work as P
_{v}=0 o'clock, photovoltaic cell stopped generating; If i
_{b}>=0, SOC
_{edlc}>=0.85, storage battery is noncharged state, and ultracapacitor stateofcharge is greater than maximum, P
_{e}=P
_{l}, powered to load by storage battery; If i
_{b}>=0, SOC
_{edlc}<0.85, detects storage battery charge state, in two kinds of situation: if SOC
_{b}>SOC
_{bMIN},
; If SOC
_{b}≤ SOC
_{bMIN}if closed gridconnected switch is incorporated into the power networks or can not in time gridconnectedly disconnects all loads;
(10) work as P
_{v}=0, i
_{b}≤ 0, SOC
_{b}> SOC
_{bMIN}time, when photovoltaic cell stops generating, storage battery is in charging or do not fill not discharge condition, and storage battery charge state value is between storage battery charge state maximum and storage battery charge state minimum value; If SOC
_{edlc}>=0.85, ultracapacitor stateofcharge value is more than or equal to maximum 0.85, P
_{e}=P
_{l}; If SOC
_{edlc}< 0.85, ultracapacitor stateofcharge is less than maximum 0.85, now controls P
_{e}=0, powered to load by storage battery;
(11) in the time that condition does not meet the condition of described (1) to (10), micropower grid control device control overhead K switch 1K2, disconnects load and microelectrical network, or takes gridconnected measure, by described gridconnected switch connection, power to load by the mode of being incorporated into the power networks.
2. a kind of microelectrical network energy storage device based on power prediction according to claim 1 is from network control method, it is characterized in that the method for the outer shroud voltage control that the control of described storage battery adopts, interior circular current control is as follows:
(1) gather the ac voltage U of feeder line A place by the voltage transformer of data acquisition unit
_{b}, by described ac voltage U
_{b}the input R1 of input storage battery pressurecontrolled outer shroud;
(2) by described ac voltage U
_{b}carry out Park conversion, obtain direct axis component voltage U
_{bd}with quadrature axis component voltage U
_{bq};
(3) by described direct axis component voltage U
_{bd}with the given busbar voltage U of daxis
_{bd_ref}do subtraction, carry out difference comparison, obtain algebraic operation difference △ U
_{bd}; By described quadrature axis component voltage U
_{bq}with the given busbar voltage U of quadrature axis
_{bq_ref}do subtraction, carry out difference comparison, obtain algebraic operation difference △ U
_{bq};
(4) by described difference △ U
_{bd}with difference △ U
_{bq}after input ratio integral element PI, then by Parker inverse transformation, obtain the given current i of ring in storage battery current control
_{b_ref};
(5) by the given current i of encircling in described storage battery current control
_{b_ref}the input R2 of ring in input storage battery current control, the output output AC current i of ring in described storage battery current control
_{b};
(6) described alternating current i
_{b}through inlet wire inductance, 1/L1S obtains voltage U
_{b}, feed back to the input R1 of described storage battery pressurecontrolled outer shroud;
(7) the interior circular current control method of described storage battery is by described current i
_{b}with described given current i
_{b_ref}do subtraction, obtain △ I
_{b}, described △ I
_{b}after filtering after link, amplitude limit link, input PWM generator, the output signal of described PWM generator is inputted the first inverter as the triggering signal of the first inverter, and described the first inverter regulates the size of alternating current according to triggering signal, thereby completes the control of interior circular current.
3. a kind of microelectrical network energy storage device based on power prediction according to claim 1 is from network control method, it is characterized in that the method for the exterior ring power control that the control of described ultracapacitor adopts, interior circular current control is as follows:
(1) described exterior ring power control gathers the alternating voltage U at feeder line B place by the voltage transformer summation current transformer of data acquisition unit
_{e}with alternating current I
_{e}, by described alternating voltage U
_{e}with alternating current I
_{e}input respectively voltage signal input R3 and the current signal input R4 of ultracapacitor power control outer shroud;
(2) by described ac voltage U
_{e}with alternating current flow valuve I
_{e}carry out Park conversion, obtain respectively directaxis voltage component U
_{ed}, directaxis current component I
_{ed}with quadratureaxis voltage component U
_{eq}, quadrature axis current component I
_{eq};
(3) described directaxis voltage component U
_{ed}, directaxis current component I
_{ed}multiply each other and obtain the activepower P of described ultracapacitor through multiplier
_{e}; Described quadratureaxis voltage component U
_{eq}, quadrature axis current component I
_{eq}multiply each other and obtain the reactive power Q of described ultracapacitor through multiplier
_{e};
(4) by described activepower P
_{e}with given activepower P
_{e_ref}do subtraction, carry out difference comparison, obtain algebraic operation difference DELTA P
_{e}; By described reactive power Q
_{e}with given reactive power Q
_{e_ref}do subtraction, carry out difference comparison, obtain algebraic operation difference DELTA Q
_{e};
(5) by described difference DELTA P
_{e}with difference DELTA Q
_{e}after input ratio integral element PI, then by Park inverse transformation, obtain the given current i of ring in ultracapacitor Current Control
_{e_ref};
(6) by the given current i of encircling in described ultracapacitor Current Control
_{e_ref}input the input R5 of ring in described ultracapacitor Current Control, the output output AC electric current I of ring in described ultracapacitor Current Control
_{e}; Described alternating current I
_{e}feed back to the current signal input R4 of described ultracapacitor power control outer shroud;
(7) the interior circular current control method of described ultracapacitor is to be that alternating current is I by the average anode current of ultracapacitor through the second inverter inversion
_{e}, by alternating current I
_{e}with the given current i of encircling in ultracapacitor Current Control
_{e_ref}do subtraction and obtain difference △ I
_{e}, △ I
_{e}after link, amplitude limit link, be input to PWM generator after filtering, the output signal of described PWM generator is inputted the second inverter as the triggering signal of the second inverter, described the second inverter regulates the size of alternating current according to triggering signal, thereby completes the control of circular current in ultracapacitor.
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