CN103296690B - On-grid energy control method for wind farm - Google Patents
On-grid energy control method for wind farm Download PDFInfo
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Abstract
The invention provides an on-grid energy control method for a wind farm. The method comprises the steps that according to public grid power brownout amount P, a wind farm level active power control system regulates wind turbine active power P; based on the size of the active power P and power brownout amount P, a storage monitoring system controls the charging and discharging of a battery to make actual internet power of the wind turbine P no less than the power brownout amount P; and the active power P and discharging power P is the actual internet power P, or the difference between the active power P and charging power P is the actual internet power P. Therefore, with the wind turbine level active power control system and the storage system combined and under the premise of meeting public grid limit output command, wind power fluctuations can be stabilized, and network power can be increased by the use of throughput wind power of the storage system, and thus, intelligent regulation is realized.
Description
Technical field
The present invention relates to field of wind farm control, particularly a kind of On-grid energy control method for wind farm.
Background technology
Wind energy, as a kind of clean regenerative resource, is more and more subject to the attention of countries in the world.In recent years, the Wind Power Development of emerging market is rapid.Under the background of national policy support and energy supply anxiety, the wind-powered electricity generation of China particularly wind power equipment manufacturing industry also emerges rapidly, has become the place that global wind-powered electricity generation enlivens the most.
Along with Wind Power Generation Industry fast development in recent years, current domestic Large-scale Wind Turbines manufacturing technology has tended to ripe, but the randomness of wind-engaging and intermittent impact, the fluctuation of Power Output for Wind Power Field is comparatively large, causes impact to a certain extent on the peak-frequency regulation of electrical network.
Summary of the invention
In view of this, main purpose of the present invention is, a kind of On-grid energy control method for wind farm is provided, wind energy turbine set field level active power controller system is combined with energy-storage system, meet public electric wire net limit exert oneself instruction prerequisite under, utilize energy-storage system to handle up wind power, realization can stabilize wind-powered electricity generation fluctuation, networking electricity can be increased again, realize intelligent control.
On-grid energy control method for wind farm comprises step:
A, wind energy turbine set field level active power controller system are according to the amount P that rations the power supply of public electric wire net
limit, the active-power P of regulating wind power unit
have;
B, energy storage monitor system are according to described active-power P
havewith the amount P that rations the power supply
limitsize control battery carry out charge or discharge, make the actual online power P of Wind turbines
on≤ ration the power supply amount P
limit;
Described reality online power P
onfor active-power P
havewith discharge power P
putsum, or
Described reality online power P
onfor active-power P
havewith charge power P
filldifference.
By upper, wind energy turbine set field level active power controller system is combined with energy-storage system, meet public electric wire net limit exert oneself instruction prerequisite under, energy-storage system is utilized to handle up wind power, realization can stabilize wind-powered electricity generation fluctuation, can increase networking electricity again, realize intelligent control.
Optionally, in step B, when actual active-power P
have> rations the power supply amount P
limit, and when the state-of-charge of battery is less than 90% in energy-storage system, enter charge mode;
When actual active-power P
have< rations the power supply amount P
limit, and when the state-of-charge of battery is greater than 10% in energy-storage system, enter discharge mode.
By upper, according to the electricity of energy-storage system, the active power in conjunction with Wind turbines judges the charge and discharge mode of energy-storage system, wind energy turbine set field level active power controller system is combined with energy-storage system.
Optionally, described charge mode comprises step:
The charge power P of battery in B11, calculating energy-storage system
fill;
B12, calculating actual online power P
on=active-power P
have-charge power P
fill;
B13, adjustment charge power P
fill, make actual online power P
on≤ ration the power supply amount P
limit.
By upper, under net power meets the prerequisite of amount of rationing the power supply actually, to greatest extent with optimum charge power, quick charge is carried out to energy-storage system, be convenient to have when Wind turbines converting electrical energy is not enough enough electricity can supply to supplement.
Preferably, described step B11 also comprises step:
B111: calculate charge power desired value P1;
B112: calculate energy-storage system and allow energy storage power P 2;
B113: the size according to P1 and P2 calculates charge power P
fill,
During P1>P2, P
fill=0.8*P2;
During P1<P2, P
fill=0.6*(P2-P1)+P1.
By upper, for different situations, calculate optimum charge power flexibly.
Preferably, described step B111 comprises step:
B1111: the active-power P calculating Wind turbines
havewith the amount P that rations the power supply
limitpower difference | P|;
B1112: calculate and remain the duration T that effectively rations the power supply
residue;
B1113: according to remaining the duration T that rations the power supply
residue, battery energy storage upper limit SOC
the upper limit, and current battery charge SOC calculate charge power desired value P1=(SOC
the upper limit-SOC) * battery total capacity/T
residue.
By upper, calculate charge power desired value according to different parameters, when charge power desired value is larger, ensure that charge power leaves certain surplus, to avoid cell damage; And desired value less time, choose charge power large as far as possible, to be full of by battery electric quantity in energy-storage system as early as possible, improve battery utilance.
Optionally, step B13 comprises step:
B131: the actual online power P detecting the wind energy turbine set after reaching accommodation limit
onwith the amount P that rations the power supply
limitsize;
B132: if actual online power P
on> rations the power supply amount P
limit, with the amount P that rations the power supply
limitfor online power P
on, simultaneously with charge power P
fillbattery charging in energy-storage system;
B133: if actual online power P
on< rations the power supply amount P
limit, reduce charge power P
fill, until P
fill=0;
B134: detect energy-storage system and whether meet electric discharge requirement, if meet, end of charging, proceeds to discharge mode;
Otherwise carry out meeting the amount P that rations the power supply
limitreport to the police.
By upper, when causing active power to decline by wind speed change, reducing charge power in good time and meeting to realize online power amount of rationing the power supply, realizing intelligent control.
Optionally, described discharge mode comprises step:
The discharge power P of battery in B21, calculating energy-storage system
put;
B22, calculating actual online power P
on=active-power P
have+ discharge power P
put;
B23, adjustment discharge power P
put, make actual online power P
on≤ ration the power supply amount P
limit.
By upper, under net power cannot meet the prerequisite of amount of rationing the power supply actually, to greatest extent energy-storage system is discharged with optimum discharge power, with the requirement of satisfied restriction amount.
Preferably, described step B11 comprises:
B211: calculate discharge power desired value P3;
B212: calculate energy-storage system and allow energy storage power P 4;
B213: the size according to P3 and P4 calculates discharge power P
put,
During P3>P4, P
put=0.8*P4;
During P3<P4, P
put=0.6*(P4-P3)+P3.
By upper, for different situations, calculate optimum discharge power flexibly.
Preferably, described step B211 comprises:
B2111: calculate active-power P
havewith the amount P that rations the power supply
limitpower difference | P|;
B2112: calculate and remain the interval duration T that effectively rations the power supply
interval;
B2113: according to remaining the interval duration T that effectively rations the power supply
interval, battery discharge lower limit SOC
under limit, and current battery charge SOC calculates discharge power desired value P3=(SOC – SOC
lower limit) * battery total capacity/T
interval.
By upper, when calculating discharge power desired value and being larger, carry out high power discharge, and ensure that discharge power leaves certain surplus, damage to avoid battery electric quantity to consume clean; And discharge power desired value less time, exhausting may large discharge power, to be exported by battery electric quantity in energy-storage system as early as possible, improves the electricity cyclic utilization rate of battery, for next energy storage prepares.
Preferably, allow described in that energy storage power is by active-power P
havewith the amount P that rations the power supply
limitminimum value in difference, energy-storage system in the charge or discharge power limit of battery and the charge or discharge transfer power limits value of described energy conversion unit determines.
By upper, realize guaranteeing that the running parameter of energy-storage system is in safe range.
Accompanying drawing explanation
Fig. 1 is the flow chart of On-grid energy control method for wind farm;
Fig. 2 is the flow chart of the first discharge mode;
Fig. 3 is the flow chart of charge mode;
Fig. 4 is for calculating optimum charge power P
fillflow chart;
Fig. 5 is the flow chart of the second discharge mode;
Fig. 6 is for calculating optimum discharge power P
putflow chart;
Fig. 7 is the principle schematic of wind energy turbine set electricity volume control system;
Fig. 8 is the principle schematic of wind energy turbine set field level active power controller system;
Fig. 9 is the principle schematic of energy storage monitor system;
Figure 10 is the principle schematic of energy-storage system.
Embodiment
On-grid energy control method for wind farm provided by the present invention, wind energy turbine set field level active power controller system is combined with energy-storage system, meet public electric wire net limit exert oneself instruction prerequisite under, energy-storage system is utilized to handle up wind power, realization can stabilize wind-powered electricity generation fluctuation, networking electricity can be increased again, realize intelligent control.
The flow chart of On-grid energy control method for wind farm as shown in Figure 1, comprising:
Step 10: energy storage monitor system judges energy-storage system whether fault.When fault-free, step 12 of being allowed for access, otherwise enter step 11.
Energy-storage system comprises battery and energy conversion unit (PCS, Power ConversionSystem), above-mentioned stream oriented device is provided with self-checking unit, the parameters such as testing voltage and operating current, whether there is the faults such as overload and short circuit with judgment means, and generate fault message.
Step 11: energy storage monitor system carries out fault alarm, and returns step 10.
Overhaul energy-storage system to point out relevant staff when carrying out fault alarm, energy storage monitor system returns step 10 to be continued to detect, to determine whether fault is removed.
Step 12: wind energy turbine set field level active power controller system judges whether wind energy turbine set receives limit that public electric wire net sends and to exert oneself instruction.
Wind energy turbine set field level active power controller system is communicated with public electric wire net by Ethernet, when public electric wire net assign limit exert oneself instruction time, wind energy turbine set field level active power controller system identification rising limit is exerted oneself the amount P that rations the power supply comprised in instruction
limit.
If receive limit to exert oneself instruction, enter step 15; Otherwise enter step 13.
Step 13: energy storage monitor system detects the state-of-charge (SOC, State Of Charge) of battery in energy-storage system.
Described state-of-charge refers to: storage battery uses the ratio of the capacity of a period of time or the residual capacity after lying idle for a long time and its fully charged state.
Energy storage monitor system detects the SOC of battery in energy-storage system, works as SOC
lower limit<SOC<SOC
the upper limittime, represent that described battery is suitable for electricity and exports, enter step 14 immediately; Otherwise then enter step 16, it is standby that energy storage monitor system controls energy-storage system.In the present embodiment, described SOC
lower limitbe 10%, SOC
the upper limitbe 90%.
Step 14: the battery that energy storage monitor system controls in energy-storage system enters the first discharge mode.
The active-power P that first discharge mode has wind energy to produce according to current wind energy turbine set
havecarry out Automatic adjusument, to meet optimum electric discharge.
The first discharge mode flow chart as described in Figure 2, comprises step:
Step 141: energy storage monitor system judges active-power P
havewith threshold power P
thresholdsize.
Wherein, threshold power P
thresholdit is the empirical value prestored according to the history data of wind energy turbine set.Judge active-power P
havewith threshold power P
thresholdthe object of size be: according to active-power P
haverate of descent adjustment battery discharge power, with the power fluctuation of smooth wind power, realize the electricity of battery system to feed back to public electric wire net, this threshold power P simultaneously
thresholdbe a statistical value, the different safety namely corresponding to different wind speed is rationed the power supply amount.Work as active-power P
haveexceed threshold power P
thresholdtime, the possibility causing public electric wire net to ration the power supply is larger.
Step 142: energy storage monitor system controls energy-storage system using invariable power as online power P
on.
Described online power P
onbe the electricity that Wind turbines is uploaded to public electric wire net.In this step, online power P
onbe the active-power P of Wind turbines
have.Preferably, can select to be less than actual active-power P
havea steady state value as online power P
on, its object is to, send the electricity of battery storage back to public electric wire net as early as possible.
Step 143: wind energy turbine set field level active power controller system call interception active-power P
haveit is made to be less than or equal to threshold power P
threshold.
Step 144: energy storage monitor system judges the state-of-charge of battery in energy-storage system.
When the state-of-charge of battery in energy-storage system is lower than SOC
threshold valuestime (close to zero), represent that battery enters the electric discharge limit, enter step 145, namely energy-storage system charges or standby again; Otherwise, when the state-of-charge of battery in energy-storage system is higher than SOC
threshold values, then step 12 is returned.In the present embodiment, SOC
threshold valuesbe 5%.
Step 15: energy storage monitor system judges the state-of-charge of battery in energy-storage system.
When the state-of-charge of battery in energy-storage system is higher than SOC
the upper limittime, represent that the state-of-charge of battery is sufficient, then do not need charging, enter step 16, namely energy storage monitor system control energy-storage system is standby, relies on the active-power P that Wind turbines produces
haveas online power P
on; Otherwise the state-of-charge of battery is lower than SOC in energy-storage system
the upper limittime, enter step 17.
Step 16: it is standby that energy storage monitor system controls energy-storage system.
Step 17: energy storage monitor system controls energy-storage system and enters charge mode.Step 17 comprises:
Step 171: energy storage monitor system calculates optimum charge power P
fill.
As shown in Figure 3, energy storage monitor system calculates optimum charge power P
fillstep comprise:
Step 1711: calculate charge power desired value P1.
First, the active-power P of Wind turbines is calculated
havewith the amount P that rations the power supply
limitpower difference | P|;
Secondly, according to current wind speed, with reference to history same period when equal-wattage difference, the statistics of duration of rationing the power supply, in conjunction with the duration T that effectively rations the power supply that this has continued
continue, estimate residue and effectively to ration the power supply duration T
residue.
Finally, according to remaining the duration T that rations the power supply
residue, battery energy storage upper limit SOC
the upper limit, current energy-storage battery amount SOC to be charged
wait to fill, and current electric quantity SOC calculate charge power desired value P1, wherein, SOC
wait to fill=(SOC
the upper limit-SOC) * battery total capacity; P1=SOC
wait to fill/ T
residue.
Step 1712: calculate energy-storage system and allow energy storage power P 2.
Described energy-storage system allow that energy storage power P 2 is by power difference | in P|, energy-storage system, the charge power limits value of battery and the charging transfer power limits value of described energy conversion unit determine, the minimum value in three is energy-storage system and allows energy storage power P 2.
Step 1713: compare the size that charge power desired value P1 and energy-storage system allow energy storage power P 2.
Wherein, as P1>P2, enter step 1714, calculate energy storage monitor system with P2 and calculate charge power P
fill; As P1<P2, enter step 1715, with P1, P2 two numerical computations energy storage monitor system calculate charge power P
fill.
Step 1714: energy storage monitor system calculates charge power P with P2
fill.
Allow energy storage power P 2 because charge power desired value P1 is greater than energy-storage system, therefore need allow that energy storage power P 2 calculates with energy-storage system, and ensure that charge power leaves certain surplus, to avoid cell damage, therefore P
fill=0.8*P2.
Step 1715: energy storage monitor system calculates charge power P with P1, P2
fill.
When charge power desired value P1 be less than energy-storage system allow energy storage power P 2 time, choose charge power large as far as possible, to be full of by battery electric quantity in energy-storage system as early as possible, improve battery utilance, therefore P
fill=0.6*(P2-P1)+P1.
Step 172: the active-power P of wind energy turbine set field level active power controller system fading margin Wind turbines
have=P
fill+ P
limit.
Wind energy turbine set field level active power controller system in conjunction with current wind speed, by P
have=P
fill+ P
limitas execution reference instruction, in regulating wind power unit, the propeller pitch angle of each blower fan makes all blower fans sum of exerting oneself equal P
have, and energy storage monitor system controls energy-storage system with P
fillcharge, by electrical power storage in battery, and be uploaded to the actual online power P of public electric wire net
onbe less than or equal to the amount P that rations the power supply
limit, meet the requirement of dispatching of power netwoks.In this step, due to the active-power P of Wind turbines
havebe greater than the amount P that rations the power supply
limit, actual online power P thus
on=P
have-P
fill.
Step 173: wind energy turbine set field level active power controller system judges whether to reach accommodation limit.
Whether the propeller pitch angle of each blower fan of wind energy turbine set field level active power controller systems axiol-ogy has reached 0 ° all, if do not reach 0 °, then returns step 172 and forms closed-loop adjustment, with satisfied reality online power P
on=P
have-P
fill, and meet actual online power P
on≤ ration the power supply amount P
limit.
If the propeller pitch angle of each blower fan all reaches 0 °, then represent that regulating power reaches capacity, namely all blower fans are quota power stage, enter step 174.
Step 174: wind energy turbine set field level active power controller systems axiol-ogy actual online power P
onwith the amount P that rations the power supply
limitsize.
Through the adjustment of step 172, when all blower fans are quota power stage, detect actual online power P
onwith the amount P that rations the power supply
limitthe object of size be, if actual online power P
on>=ration the power supply amount P
limit, then represent that active power regulation still has living space, and still can improve to the power that energy-storage system 76 charges, return step 172, form closed-loop adjustment loop.
Otherwise, if if the propeller pitch angle of each blower fan all reaches 0 °, and actual online power P
on< rations the power supply amount P
limit, then, when representing that regulating power reaches capacity, current wind speed reduces gradually, the active-power P produced
havethe amount P that rations the power supply may be less than
limit, enter step 175.
Step 175: energy storage monitor system control P
fillbe decreased to 0 gradually, confirm air quantity dead band.
After wind speed reduces, the active-power P produced
havenaturally decline, when meeting the amount P that rations the power supply
limittime, need energy storage monitor system to control to reduce the charge power P to energy-storage system
fill, again detect actual online power P
onwith the amount P that rations the power supply
limitsize, if actual online power P
onstill the amount P that rations the power supply is less than
limit, then the charge power P to energy-storage system is reduced further
fill, until P
fill=0.In this step, because wind-force reduces, and by P
fillbe decreased to 0 gradually.In this step, actual online power P
on=P
have-P
fill, as charge power P
fillwhen being decreased to 0, actual online power P
on=active-power P
have.
Because wind-force reduces to cause power P of surfing the Net
onthe amount P that rations the power supply cannot be met
limit, then record wind-force and reduce the moment to power P of surfing the Net
on≤ ration the power supply amount P
limitduration, and the linear relation between air quantity.Just can confirm air quantity dead band by accumulation, when again there is air quantity dead band, just directly can confirm power P of surfing the Net
onthe amount P that rations the power supply cannot be met
limit, report to the police, and enter step 18.Confirm that the advantage in air quantity dead band is, when wind speed cannot meet the amount P that rations the power supply
limittime, avoid control Wind turbines and energy-storage system frequently to open, cause damaging.
Step 176:: judge whether energy-storage system charging completes.
If wind-force reduces further, then power P of surfing the Net
onthe amount P that rations the power supply cannot be met
limit, now can make energy storage system discharges, to make online power P
onequal the amount P that rations the power supply
limit.This just needs to judge that in energy-storage system, whether battery meets electric discharge requirement (i.e. 10%<SOC), if meet electric discharge requirement, enters step 177; If do not meet electric discharge requirement, then enter step 178.
Step 177: exit energy-storage system charging procedure, energy-storage system enters the second discharge mode.
When battery meets electric discharge requirement, and the actual online power P of Wind turbines
onthe amount P that rations the power supply cannot be met
limittime, enter the second discharge mode (i.e. step 18), control energy storage system discharges by energy storage monitor system, to ensure actual online power P
onmeet the amount P that rations the power supply
limitrequirement.
Step 178: it is standby that energy storage monitor system controls energy-storage system.
Step 18: energy storage monitor system controls battery in energy-storage system and enters the second discharge mode.
Second discharge mode need meet online power P
on>=ration the power supply amount P
limit, as shown in Figure 5, the second discharge mode comprises:
Step 181: energy storage monitor system calculates optimum discharge power P
put, in discharge process, actual online power P need be met
on=P
have+ P
put.
As shown in Figure 6, energy storage monitor system calculates optimum discharge power P
putstep comprise:
Step 1811: calculate discharge power desired value P3.
First, active-power P is calculated
havewith the amount P that rations the power supply
limitdifference | P|;
Secondly, according to current wind speed, the statistics of duration of rationing the power supply when equal-wattage difference the same period with reference to history, reduces duration T in conjunction with air quantity
reduce, estimate residue and effectively to ration the power supply interval duration T
interval.
Finally, according to remaining the interval duration T that effectively rations the power supply
interval, battery discharge lower limit SOC
lower limit, battery amount SOC to be discharged
wait to put, and current electric quantity SOC calculates discharge power desired value P3, and wherein, SOC
wait to put=(SOC – SOC
lower limit) * battery total capacity; P3=SOC
wait to put/ T
interval.
Step 1812: calculate energy-storage system and allow discharge power P4.
Described energy-storage system allow that discharge power P4 is by described difference | in P|, energy-storage system, the discharge power limits value of battery and the electric discharge transfer power limits value of described energy conversion unit determine, the minimum value in three is energy-storage system and allows discharge power P4.
Step 1813: discharge power desired value P3 and energy-storage system allow the size of discharge power P4.
Wherein, as P3>P4, enter step 1814, calculate energy storage monitor system with P4 and calculate discharge power P
put; As P3<P4, enter step 1815, with P3, P4 two discharge power P of numerical computations battery
put.
Step 1814: calculate discharge power P with P4
put.
Allow discharge power P4 because discharge power desired value P3 is greater than energy-storage system, therefore need allow that discharge power P4 calculates with energy-storage system, and ensure that discharge power leaves certain surplus, damage, P to avoid battery electric quantity to consume clean
put=0.8*P4.
Step 1815: calculate discharge power P with P3, P4
put.
When discharge power desired value P3 be less than energy-storage system allow discharge power P4 time, choose discharge power large as far as possible, to be exported by battery electric quantity in energy-storage system as early as possible, improve the electricity cyclic utilization rate of battery, for next energy storage prepares, P
put=0.6*(P4-P3)+P3.
Step 182: energy storage monitor system judges the state-of-charge of battery in energy-storage system.
When the state-of-charge of battery in energy-storage system is lower than SOC
threshold valuestime (close to zero), enter step 183; Otherwise, when the state-of-charge of battery in energy-storage system is higher than SOC
threshold values, then step 181 is returned.Identical, SOC
threshold valuesbe 5%.
Step 183: it is standby that energy storage monitor system controls energy-storage system.
Wind energy turbine set electricity volume control system as shown in Figure 7, comprising:
Wind turbines 73.
Energy-storage system 76, is connected with Wind turbines 73.
Wind energy turbine set field level active power controller system 72, the limit for sending according to the public electric wire net 71 that receives is exerted oneself instruction, controls the active-power P of Wind turbines 73
have.
Energy storage monitor system 75, be connected with wind energy turbine set field level active power controller system 72 and energy-storage system 76 respectively, for detecting the SOC of energy-storage system 76, and by the communication with wind energy turbine set field level active power controller system 72, control energy-storage system 76 and carry out charge or discharge, make the actual online power P of Wind turbines
on≤ ration the power supply amount P
limit.
First transformer 74, is connected between Wind turbines 73 and public electric wire net 71.
Second transformer 77, is connected between energy-storage system 76 and public electric wire net 71.
Wherein, as shown in Figure 8, wind energy turbine set field level active power controller system 72 comprises the first main control unit 721, and connected first communication unit 722, wind speed measurement unit 723, power detecting unit 724 and the first memory cell 725.
Described wind speed measurement unit 723 is for detecting the wind speed information of environment residing for Wind turbines 73 in real time.
The active-power P that power detecting unit 724 produces for detecting Wind turbines 73
have.
First communication unit 722 is connected with second communication unit 752 network in public electric wire net 71 and hereinafter described energy storage monitor system 74 respectively, what receive that the limit of public electric wire net 71 exerts oneself energy-storage system 76 that instruction and energy storage monitor system 75 send fills (putting) electrical power, and exports control command to energy storage monitor system 75.
The data that first memory cell 725 pairs public electric wire net and/or energy storage monitor system 75 send carry out data buffer storage, and these data comprise the amount P that rations the power supply that public electric wire net 71 is assigned
limit, energy storage monitor system 75 feed back energy-storage system 76 in battery 764 state-of-charge and fill (putting) electrical power.
First main control unit 721 is for exporting the propeller pitch angle of each blower fan in control command adjustment Wind turbines 73, to adjust the active-power P of Wind turbines 73 according to the state-of-charge of battery in the wind speed information of environment residing for Wind turbines 73 and energy-storage system 76
have, ensure active-power P
have+ discharge power P
put≤ ration the power supply amount P
limit; Or guarantee active-power P
have-charge power P
put≤ ration the power supply amount P
limit.
As shown in Figure 9, energy storage monitor system 75 comprises the second main control unit 751, and the second communication unit 752, breakdown judge unit 753, SOC detecting unit 754, second memory cell 755 and the clock unit 756 that are connected with the second main control unit 751 respectively.
Described second communication unit 752 is connected with the first communication unit 722 network, for receiving the active-power P that the first communication unit 722 exports
have, and export the SOC of battery 764 in energy-storage system 76 and fill (putting) electrical power; In addition, second communication unit 752 is also connected with the communication unit 762 in hereinafter described energy-storage system 76, receives the fault message of battery 764 and energy conversion unit 763 in energy-storage system 76.
Fault detection unit 753 is connected with second communication unit 752 by the second main control unit 751, for receiving described fault message and carrying out judgement checking.
SOC detecting unit 754 is connected with the battery 764 in the second main control unit 751 and hereinafter described energy-storage system 76 respectively, for detecting the state-of-charge of battery 764 in energy-storage system 76, and feeds back to the second main control unit 751.
Clock unit 756 is for providing clock information to the second main control unit 751.
Charge and discharge power P is stored in second memory cell 755
filland P
putcalculating formula, and carry out the active-power P that buffer memory wind energy turbine set field level active power controller system 72 sends
havewith the amount P that rations the power supply
limit.
Described second main control unit 751 is for foundation active-power P
havewith the amount P that rations the power supply
limitcontrol energy-storage system 76 and carry out charge or discharge, and calculate optimum charge power P
fillor calculate optimum discharge power P
putcorresponding charge-discharge electric power is carried out to control energy-storage system 76; Whether described second main control unit 751 also receives the amount P that rations the power supply for foundation
limitexport control command, controlled the discharge mode (the first or second discharge mode) of battery 764 by energy conversion unit 763.
In the present embodiment, the function of the first main control unit 721 and the second main control unit 751 realizes by the industrial computer of model to be IPC-810B or model be RPPC-6084S.
As shown in Figure 10, energy-storage system 76 comprises the communication unit 762, energy storage control module 761, energy conversion unit 763 and the battery 764 that connect successively.Described energy control module 761 fills (putting) electrical power control command control energy conversion unit 763 pairs of batteries 764 for the optimum received according to communication unit 762 and carries out charge and discharge power transfer.
In addition, also comprise the voltage detection unit, the current detecting unit (not shown) that are connected with energy conversion unit 763 and battery 764 respectively, for the running parameter of detected energy converting unit 763 and battery 764.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.In other words, in the scope not departing from purport spirit of the present invention, suitable change can be carried out to above-mentioned execution mode.
Claims (7)
1. an On-grid energy control method for wind farm, is characterized in that, comprises step:
A, wind energy turbine set field level active power controller system are according to the amount P that rations the power supply of public electric wire net
limit, the active-power P of regulating wind power unit
have;
B, energy storage monitor system are according to described active-power P
havewith the amount P that rations the power supply
limitsize control battery carry out charge or discharge, make the actual online power P of Wind turbines
on≤ ration the power supply amount P
limit;
Described reality online power P
onfor active-power P
havewith discharge power P
putsum, or
Described reality online power P
onfor active-power P
havewith charge power P
filldifference;
In step B, work as active-power P
have> rations the power supply amount P
limit, and when the state-of-charge of battery is less than 90% in energy-storage system, enter charge mode;
Work as active-power P
have< rations the power supply amount P
limit, and when the state-of-charge of battery is greater than 10% in energy-storage system, enter discharge mode;
Described charge mode comprises step:
The charge power P of battery in B11, calculating energy-storage system
fill;
B12, calculating actual online power P
on=active-power P
have-charge power P
fill;
B13, adjustment charge power P
fill, make actual online power P
on≤ ration the power supply amount P
limit;
Step B13 comprises step:
B131: the actual online power P detecting the wind energy turbine set after reaching accommodation limit
onwith the amount P that rations the power supply
limitsize;
B132: if actual online power P
on> rations the power supply amount P
limit, with the amount P that rations the power supply
limitfor reality online power P
on, simultaneously with charge power P
fillbattery charging in energy-storage system;
B133: if actual online power P
on< rations the power supply amount P
limit, reduce charge power P
fill, until P
fill=0;
B134: detect energy-storage system and whether meet electric discharge requirement, if meet, end of charging, proceeds to discharge mode,
Otherwise carry out meeting the amount P that rations the power supply
limitreport to the police.
2. On-grid energy control method for wind farm according to claim 1, is characterized in that, described step B11 also comprises step:
B111: calculate charge power desired value P1;
B112: calculate energy-storage system and allow energy storage power P 2;
B113: the size according to P1 and P2 calculates charge power P
fill,
During P1>P2, P
fill=0.8*P2;
During P1<P2, P
fill=0.6* (P2-P1)+P1.
3. On-grid energy control method for wind farm according to claim 2, is characterized in that, described step B111 comprises step:
B1111: the active-power P calculating Wind turbines
havewith the amount P that rations the power supply
limitpower difference | P|;
B1112: calculate and remain the duration T that effectively rations the power supply
residue
B1113: according to remaining the duration T that effectively rations the power supply
residue, battery energy storage upper limit SOC
the upper limit, and current battery charge SOC, calculate charge power desired value P1=(SOC
the upper limit-SOC) * battery total capacity/T
residue.
4. On-grid energy control method for wind farm according to claim 1, is characterized in that, described discharge mode comprises step:
The discharge power P of battery in B21, calculating energy-storage system
put;
B22, calculating actual online power P
on=active-power P
have+ discharge power P
put;
B23, adjustment discharge power P
put, make actual online power P
on≤ ration the power supply amount P
limit.
5. On-grid energy control method for wind farm according to claim 4, is characterized in that, described step B11 comprises:
B211: calculate discharge power desired value P3;
B212: calculate energy-storage system and allow energy storage power P 4;
B213: the size according to P3 and P4 calculates discharge power P
put,
During P3>P4, P
put=0.8*P4;
During P3<P4, P
put=0.6* (P4-P3)+P3.
6. On-grid energy control method for wind farm according to claim 5, is characterized in that, described step B211 comprises:
B2111: calculate active-power P
havewith the amount P that rations the power supply
limitpower difference | P|;
B2112: calculate and remain the interval duration T that effectively rations the power supply
interval
B2113: according to remaining the interval duration T that effectively rations the power supply
interval, battery discharge lower limit SOC
under limit, current battery charge SOC calculates discharge power desired value P3=(SOC – SOC
lower limit) * battery total capacity/T
interval.
7. the On-grid energy control method for wind farm according to claim 2 or 5, is characterized in that, described in allow that energy storage power is by active-power P
havewith the amount P that rations the power supply
limitin difference, energy-storage system in the charge or discharge power limit of battery and energy-storage system energy conversion unit charge or discharge transfer power limits value in minimum value determine.
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| CN106230023B (en) * | 2016-08-22 | 2018-09-28 | 中国石油化工股份有限公司洛阳分公司 | A kind of upper off line power method for automatically regulating of industrial power plant |
| CN107872065B (en) * | 2016-09-27 | 2020-02-11 | 北京睿能世纪科技有限公司 | Method and device for controlling output of power grid energy storage system |
| CN107834574B (en) * | 2017-07-31 | 2022-03-18 | 上海电气分布式能源科技有限公司 | Control method for power exchange between distributed energy system and power grid |
| WO2023024028A1 (en) * | 2021-08-26 | 2023-03-02 | 华为数字能源技术有限公司 | Power system and control method for power system |
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