CN110535154A - A kind of energy-storage system and its control method based on SOC management - Google Patents
A kind of energy-storage system and its control method based on SOC management Download PDFInfo
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Abstract
The present invention provides a kind of energy-storage system and its control method based on SOC management, it include: the requirement management objectives power and peak load shifting target power for obtaining energy-storage system, judge whether the SOC of energy-storage system is greater than the standby electric threshold value of preset requirement, if the SOC of energy-storage system is greater than the standby electric threshold value of preset requirement, then when requirement management objectives power requirement energy-storage system charges or is standby, it is subject to peak load shifting target power, and in requirement management objectives power requirement energy storage system discharges, electric discharge in two target powers of being subject to requires deep one, determine the target power instruction of energy-storage system, if the SOC of energy-storage system is less than or equal to the standby electric threshold value of preset requirement, it is then preferential with requirement management objectives power, determine the target power instruction of energy-storage system, target power according to energy-storage system instructs, control energy storage System executes corresponding movement, improves the economy of energy-storage system.
Description
Technical field
The invention belongs to electric power network technique fields, more specifically, more particularly to it is a kind of based on SOC management energy-storage system and
Its control method.
Background technique
As the technologies such as battery, inverter and micro-capacitance sensor continue to develop, using energy-storage system as the power domain service of carrier
It operates and gives birth to, the main application of power domain service at present is peak load shifting, requirement management and frequency modulation.
For the synergistic effect of peak load shifting and requirement management, scheme existing in the prior art is: arriving in current time
When up to peak rate period peace rate period, current PCC (Point of Common Coupling, public company are obtained from ammeter
Connect) point actual use power；Actually use power be less than it is preset report demand power when, according to preset electric discharge ratio
It discharges.
But above-mentioned technical proposal only carries out Collaborative Control in peak rate period peace rate period, in paddy rate period
Do not carry out Collaborative Control, also, preset electric discharge ratio be it is fixed, can not according to battery current electric quantity variation and become
Change, if this has been resulted in, preset electric discharge ratio setting is smaller, and the current remaining electricity of battery can be discharged in advance, and there are nothings
Method carries out the neutral gear phase of requirement management, if preset electric discharge ratio setting is larger, the current remaining electricity meeting of battery can not
Discharged completely, so battery be configured with redundancy, cause energy-storage system can not total synergy control, economy it is poor.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of energy-storage system and its control method based on SOC management, with
Solve the problems, such as to cause energy-storage system can not total synergy control and economy it is poor.
First aspect present invention discloses a kind of control method of energy-storage system based on SOC management, comprising:
Obtain the requirement management objectives power and peak load shifting target power of the energy-storage system；
Judge whether the SOC of the energy-storage system is greater than the standby electric threshold value of preset requirement；
If the SOC of the energy-storage system is greater than the standby electric threshold value of the preset requirement, in the requirement management objectives function
Rate require energy-storage system charging or it is standby when, be subject to the peak load shifting target power, and manage mesh in the requirement
When marking energy storage system discharges described in power requirement, electric discharge in two target powers of being subject to requires deep one, determines the storage
The target power instruction of energy system；
If the SOC of the energy-storage system is less than or equal to the standby electric threshold value of the preset requirement, mesh is managed with the requirement
Mark power be it is preferential, determine the energy-storage system target power instruct；
Target power according to the energy-storage system instructs, and controls the energy-storage system and executes corresponding movement；The phase
The movement answered include: charging, electric discharge and it is standby in any one.
Optionally, if the SOC of the energy-storage system is greater than the standby electric threshold value of the preset requirement, in the requirement management
Target power require energy-storage system charging or it is standby when, be subject to the peak load shifting target power, comprising:
When the SOC of the energy-storage system is greater than the preset requirement for electric threshold value, if meeting any one following feelings
Condition: the peak load shifting target power requires energy-storage system standby and the requirement management objectives power requirement energy-storage system waits for
Machine, the peak load shifting target power requires energy storage system discharges and the requirement management objectives power requirement energy-storage system waits for
Machine, the peak load shifting target power requires energy-storage system charging and the requirement management objectives power requirement energy-storage system waits for
Machine, the peak load shifting target power requires energy-storage system charging and the requirement management objectives power requirement energy-storage system fills
Electricity, the peak load shifting target power requires energy storage system discharges and the requirement management objectives power requirement energy-storage system fills
Electricity, and, the peak load shifting target power requires energy-storage system standby and requirement management objectives power requirement energy storage system
System charging, then instruct using peak load shifting target power as the target power of the energy-storage system.
Optionally, if the SOC of the energy-storage system is greater than the standby electric threshold value of the preset requirement, in the requirement management
When target power requires the energy storage system discharges, electric discharge in two target powers of being subject to requires deep one, comprising:
When the SOC of the energy-storage system is greater than the preset requirement for electric threshold value, if the peak load shifting target function
Rate requires energy storage system discharges and the requirement management objectives power requirement energy storage system discharges, then with the peak load shifting target
Target power instruction of most deep one as the energy-storage system of discharging is required in power and the requirement management objectives power；
Wherein, one of the maximum absolute value in two target powers is to require most deep one that discharges；
When the SOC of the energy-storage system is greater than the preset requirement for electric threshold value, if the peak load shifting target function
Rate requires energy-storage system standby and the requirement management objectives power requirement energy storage system discharges, alternatively, the peak load shifting mesh
The charging of power requirement energy-storage system and the requirement management objectives power requirement energy storage system discharges are marked, then with the requirement management
Target power is instructed as the target power of the energy-storage system.
Optionally, if the SOC of the energy-storage system is less than or equal to the standby electric threshold value of the preset requirement, with the requirement
Management objectives power be it is preferential, determine the energy-storage system target power instruction, comprising:
When the SOC of the energy-storage system is less than or equal to the preset requirement for electric threshold value, if meeting following any
A kind of situation: the peak load shifting target power requires energy-storage system standby and requirement management objectives power requirement energy storage system
It unites standby, the peak load shifting target power requires energy storage system discharges and the requirement management objectives power requirement energy-storage system
Standby, the peak load shifting target power requires energy storage system discharges and the requirement management objectives power requirement energy-storage system is put
Electricity, the peak load shifting target power requires energy-storage system standby and the requirement management objectives power requirement energy-storage system is put
Electricity, the peak load shifting target power requires energy-storage system charging and the requirement management objectives power requirement energy-storage system is put
Electricity, the peak load shifting target power requires energy-storage system charging and the requirement management objectives power requirement energy-storage system fills
Electricity, the peak load shifting target power requires energy storage system discharges and the requirement management objectives power requirement energy-storage system fills
Electricity, and, the peak load shifting target power requires energy-storage system standby and requirement management objectives power requirement energy storage system
System charging, then instruct using the requirement management objectives power as the target power of the energy-storage system.
Optionally, be with the requirement management objectives power it is preferential, determine the energy-storage system target power instruction, also
Include:
If the peak load shifting target power requires energy-storage system charging and the requirement management objectives power requirement energy storage
System standby is then instructed using the peak load shifting target power as the target power of the energy-storage system.
Optionally, be with the requirement management objectives power it is preferential, determine the energy-storage system target power instruction
Before, further includes:
Judge that the charging of requirement management objectives power requirement, peak load shifting target power require electric discharge and the energy-storage system
SOC be in the dead zone range of the standby electric threshold value of requirement, if meet simultaneously；
If the charging of requirement management objectives power requirement, peak load shifting target power require electric discharge and the energy-storage system
SOC is in the dead zone range of the standby electric threshold value of requirement, is met simultaneously, then is referred to using zero as the target power of the energy-storage system
It enables；
If the charging of requirement management objectives power requirement, peak load shifting target power require electric discharge and the energy-storage system
SOC is in the dead zone range of the standby electric threshold value of requirement, is not met simultaneously, then is executed described with the requirement management objectives power
Be it is preferential, determine the energy-storage system target power instruction the step of.
Optionally, after the target power of the determination energy-storage system, further includes:
Judge whether the load requirement of the energy-storage system is greater than threshold value；
If the load requirement of the energy-storage system is greater than threshold value, the target power for updating the energy-storage system with zero refers to
It enables；
If the load requirement of the energy-storage system is less than or equal to threshold value, bounds checking is carried out to the energy-storage system.
Optionally, the threshold value is MAX [Qpcc, Q]-P；
Wherein, Qpcc is the real-time maximum demand of the commonly connected PCC point of the energy-storage system, and Q is the energy-storage system
Target requirement, P be the energy-storage system chargeable power.
It is optionally, described that bounds checking is carried out to the energy-storage system, comprising:
Judge whether the SOC of the energy-storage system is more than or equal to the default electric discharge cutoff value of energy-storage system and is less than or equal to pre-
If charge cutoff value；
If the SOC of the energy-storage system is less than preset electric discharge cutoff value or is greater than preset charge cutoff value, with zero
Update the target power instruction of the energy-storage system.
Optionally, whether it is more than or equal to preset electric discharge cutoff value in the SOC for judging the energy-storage system and is less than
After preset charge cutoff value, if the SOC of the energy-storage system be more than or equal to preset electric discharge cutoff value and less than etc.
In preset charge cutoff value, then further include:
Judge whether the target power instruction of the energy-storage system is more than or equal to the phase of the available power of the energy-storage system
Anti- number, and it is less than or equal to the available power of the energy-storage system；
If the target power instruction of the energy-storage system is less than the opposite number of the available power of the energy-storage system, or is greater than
The available power of the energy-storage system then updates the energy storage with the product of the opposite number of the available power and the available power
The target power of system instructs.
Second aspect of the present invention discloses a kind of energy-storage system based on SOC management, comprising: energy-storage battery, battery management
System, current transformer and controller；
The energy-storage battery is connected by current transformer with power grid；
The controller is connected with the battery management system and the current transformer respectively；
The battery management system, for acquiring the data information of the energy-storage battery, and by collected energy-storage battery
Data information be sent to the controller；
The controller, for executing the energy-storage system based on SOC management described in first aspect present invention any one
Control method.
From above-mentioned technical proposal it is found that it is provided by the invention it is a kind of based on SOC management energy-storage system control method, if
The SOC of energy-storage system is greater than the standby electric threshold value of preset requirement, then requirement management objectives power requirement energy-storage system charge or to
When machine, it is subject to peak load shifting target power, and in requirement management objectives power requirement energy storage system discharges, with two targets
Electric discharge requires the target power instruction that energy-storage system is determined subject to deep one in power, if the SOC of energy-storage system is less than or equal to
The standby electric threshold value of preset requirement, then be with requirement management objectives power it is preferential, determine that the target power of energy-storage system instructs；Cause
This, why the target power instruction of energy-storage system is worth and the SOC of energy-storage system, peak load shifting target power and requirement management objectives
Power is related, is not influenced by rate period, and no matter rate period is which kind of to carry out Collaborative Control period；Also, according to storage
The target power instruction of energy system, control energy-storage system executes to be acted accordingly, so that the SOC of energy-storage system indirectly controls energy storage
System charged, is discharged or standby, and avoiding energy-storage system from advance discharging electricity can not be discharged with electricity completely and be caused
Battery configuring redundancy and energy-storage system it is not at full charge and cause energy-storage system utilization rate low so that energy-storage system is complete
Face Collaborative Control improves the economy of energy-storage system.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is a kind of flow chart of the control method of energy-storage system based on SOC management provided in an embodiment of the present invention；
Fig. 2 is the flow chart of the control method of the energy-storage system of another kind SOC management provided in an embodiment of the present invention；
Fig. 3 is the flow chart of the control method of the energy-storage system for another SOC management that inventive embodiments provide；
Fig. 4 is the flow chart of the control method of the energy-storage system of another kind SOC management provided in an embodiment of the present invention；
Fig. 5 is the flow chart of the control method of the energy-storage system of another kind SOC management provided in an embodiment of the present invention；
Fig. 6 a is to keep away peak type load chart；
Fig. 6 b is three peak type load charts；
Fig. 6 c is bimodal pattern load chart；
Fig. 6 d is bimodal pattern load chart；
Fig. 6 e is stochastic pattern load chart；
Fig. 6 f is leveling style load chart；
Fig. 7 is a kind of schematic diagram of energy-storage system based on SOC management provided in an embodiment of the present invention；
Fig. 8 a is the power of PCS and the graph of relation of NPV；
Fig. 8 b is the power of PCS and the graph of relation of IRR；
Fig. 8 c is stored energy capacitance and the graph of relation of IRR.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In this application, the terms "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion,
So that the process, method, article or equipment for including a series of elements not only includes those elements, but also including not having
The other element being expressly recited, or further include for elements inherent to such a process, method, article, or device.Do not having
There is the element limited in the case where more limiting by sentence "including a ...", it is not excluded that in the mistake including the element
There is also other identical elements in journey, method, article or equipment.
In order to make it easy to understand, peak load shifting and requirement management and its Collaborative Control are illustrated at this, it is as follows:
Peak load shifting: the electricity price of the big industrial user in China is mainly by the way of timesharing sale, i.e., electricity price is respectively peak electricity
Valence, paddy electricity valence peace electricity price, even there are also sharp electricity prices in some areas.Power grid takes such pricing strategy to guide enterprise customer
Peak load shifting reduces power grid peak of power consumption.
Peak load shifting also known as be peak valley arbitrage, peak valley arbitrage is the current main profit model of user side energy storage, i.e. user
It is stored in energy-storage system in paddy rate period from power grid power purchase, at peak, rate period is supplied using the electricity of paddy rate period storage
Institute's electricity demand is given, is got a profit to be realized using electricity price between peak and valley, influencing its economy most important point is that there are enough peaks
Paddy electricity price differential, therefore, peak load shifting have earning electricity price price difference, and reduce the effect of power grid peak of power consumption.
Requirement management: it is primarily in terms of in " two-part rate system price ", enterprise customer is in addition to the electricity charge monthly paid, also according to change
Depressor capacity or actual use requirement, pay basic charge as per installed capacity to power grid.Requirement management and utilization energy storage device is on user's requirement peak
Shi Jinhang electric discharge, cuts down requirement peak, to save electricity charge spending.
Through inventor the study found that industrial load can be divided into five classes.Here, being said respectively to five type load curves
It is bright, as follows:
(1) keep away peak type: as shown in Figure 6 a, peak of power consumption is in paddy rate period, such enterprise is using adjustment production plan
Time-of-use tariffs policy is responded, the characteristics of such enterprise has high degree of automation, and energy consumption is high.
(2) three peak types: as shown in Figure 6 b, 7:00~9:00 is peak of power consumption at night, such enterprise is production task
It is put into and does at night, such enterprise tends to belong to manufacturing industry, there is more automation equipment.
(3) bimodal pattern: as described relative to figs. 6c and 6d, there is consistent part throttle characteristics and one of the most common type with the whole network
Electricity consumption type, as typical " M " type load curve.
(4) stochastic pattern: as shown in fig 6e, such user belongs to discrete manufacturing enterprise, the production plan that do not fix,
It can be motivated to participate in requirement management.
(5) leveling style: as shown in Figure 6 f, power load continues height on daytime, and electricity consumption fluctuation is small, and this kind of user is often
It is the enterprise for having installed power-saving technology.
Wherein, the user of peak type is kept away, does not produce or produces on a small quantity daytime, plant area's load is lower, night mass production, plant area
Load is higher.Therefore the user for keeping away peak type is not suitable for using peak load shifting policy control.Thus peak load shifting and requirement management association
Design object with strategy is three peak types, bimodal pattern, stochastic pattern and leveling style.It, can not be pre- in advance for stochastic pattern load
Know when requirement peak arrives, i.e., random load curve can not be divided into power output period, charging time section and stand-by time section.
Regular type (peak type, bimodal pattern and leveling style) curve characteristic: in general, can specify which period requirement peak is located at, which
Period is not in.Such as the enterprise that normal load curve on and off duty is bimodal pattern, requirement peak is located at the working period, and will not
When positioned at night paddy.
Here, economic analysis is carried out by taking bimodal pattern as an example, it is as follows:
Pass through the different power/capacity configuration of setting energy-accumulating power station, analysis project income, from IRR (Internal Rates
OfReturn, internal rate of return) and two parameters of NPV (NetPresentValue, net present value (NPV)) reflect the need of the part throttle characteristics
Buret manages economy.
The load curve as shown in Fig. 6 d or 6c, the load curve are bimodal patterns, and there are two apparent peak values.According to figure
In the graph of relation of PCS shown in 8a (Power Control System, energy accumulation current converter) and NPV, when PCS power increases
When, NPV, which first increases, then to be reduced until for negative, and therefore, NPV is there are maximum, the free cash flow that client can obtain at this time
Amount is most, by Fig. 8 b and 8c it is found that the corresponding IRR of NPV maximum is 18% at this time.Therefore, user is less than in PCS power
When 0.5MW, IRR is greater than 10%, has preferable economy.The most crucial key of Collaborative Control problem be clear requirement management with
Issue of priority of the peak load shifting under different scenes.
In control characteristic, peak load shifting designs control strategy, the general form of expression according to local peak interval of time, price differential
It fills one for one and puts and fill two with two and put.Here, by one fill one put for be illustrated, two to fill the principle that two put similar, herein no longer
It repeats one by one, as follows:
For the income for guaranteeing peak load shifting, battery capacity can be discharged completely to obtain and receive in the ending of peak rate period
Benefit can not carry out requirement management at this time.Requirement administration base power grid collects the electricity charge of requirement peak according to monthly requirement peak, thus,
In the case where not considering algorithm failure, any requirement peak value arrives, and energy-storage system requires to respond with all strength, to guarantee to work as
The moon, requirement peak was no more than target requirement.
Its Collaborative Control characteristic: when peak valley arbitrage is discharged with total power, not needing requirement management, because energy-storage system is
Discharge power can be used up to maximum, peak valley arbitrage is generally discharged with maximum available power, i.e., peak load shifting target power is that maximum can
With power, when peak valley arbitrage discharges electricity completely, requirement management can not be carried out.
Collaborative Control design should follow: for stochastic pattern load, requirement peak value is likely located at any time, if need to guarantee to need
Income is measured, the capacity of battery must be done subregion in logic, to guarantee to have capacity to for 24 hours to cut down requirement.For being directed to
The relatively regular user of load does not need to carry out the standby electricity of requirement for 24 hours.Such as bimodal pattern curve, requirement peak position can be clearly known
In two working periods on daytime, then night does not need to carry out the standby electricity of requirement, and the strategy on daytime is then according to energy-storage system
Proportion is finely adjusted.
Therefore, the other types other than keeping away peak type are suitable for the energy storage system provided by the invention based on SOC management
The control method of system, still, stochastic pattern are more suitable for the control of the energy-storage system, implementation procedure and the principle ginseng of the control method
See below embodiment.
The embodiment of the invention provides a kind of control methods of energy-storage system based on SOC management, to solve energy-storage system
It can not total synergy control, the poor problem of economy.The control method, referring to Fig. 1, comprising the following steps:
S101, the requirement management objectives power and peak load shifting target power for obtaining energy-storage system.
Requirement management objectives power is the target power of requirement management and controlling tactics in energy-storage system, peak load shifting target function
Rate is the target power of peak load shifting control strategy.
S102, judge whether the SOC (State OfCharge, remaining capacity) of energy-storage system is greater than the standby electricity of preset requirement
Threshold value.
The SOC of energy-storage system can be obtained by the battery management system of energy-storage system, wherein SOC is to work as energy-storage battery
Residual capacity after lying idle using a period of time or for a long time, ratio with the capacity of its fully charged state commonly use percentage
Number indicates.SOC=1 is expressed as energy-storage battery full state, its state-of-charge must be taken into consideration when running in control energy-storage battery, with
The phenomenon that avoiding the occurrence of super-charge super-discharge.
In the value difference of SOC, show that the charge and discharge ability of energy-storage system is different, therefore, in the charge and discharge of energy-storage system
In the case that ability is different, it should be determined that energy-storage system is different Collaborative Control so that the movement of the execution of energy-storage system with
The charging and discharging capabilities of energy-storage system are more bonded.The standby electric threshold value of requirement is that peak load shifting and requirement manage the critical of priority division
Point reduces a possibility that requirement peak carrys out the not enough power supply of interim energy-storage system.In general, it is greater than the standby electric threshold of requirement in SOC
When value, that is, illustrates that the electricity of energy-storage system is sufficient, peak valley arbitrage can be carried out at this time, that is, discharged to earn electricity price price difference.
When SOC is less than requirement for electric threshold value, that is, illustrates that the SOC of energy-storage system is relatively low, requirement management can be carried out at this time, so that energy storage
The standby electricity of the progress of system.
The standby electric threshold value of requirement can be 10%, naturally it is also possible to be other values, the standby electric threshold value of requirement according to actual conditions and
It is fixed, within the scope of protection of this application.
If the SOC of energy-storage system is greater than the standby electric threshold value of preset requirement, S103 is thened follow the steps；If the SOC of energy-storage system
Electric threshold value standby less than or equal to preset requirement, thens follow the steps S104.
S103, requirement management objectives power requirement energy-storage system charging or it is standby when, be with peak load shifting target power
Standard, and in requirement management objectives power requirement energy storage system discharges, one with requirement depth of discharging in two target powers is
Standard determines the target power instruction of energy-storage system.
Specifically, when requirement management objectives power requirement energy-storage system charges or is standby, with peak load shifting target power
Target power as energy-storage system instructs.
In practical applications, if meeting any one following situation: peak load shifting target power requires energy-storage system standby
And requirement management objectives power requirement energy-storage system is standby, peak load shifting target power requires energy storage system discharges and requirement management
Target power requires energy-storage system standby, and peak load shifting target power requires energy-storage system charging and requirement management objectives power is wanted
Ask energy-storage system standby, peak load shifting target power requires energy-storage system charging and requirement management objectives power requirement energy-storage system
Charging, peak load shifting target power requires energy storage system discharges and requirement management objectives power requirement energy-storage system charges, and,
Peak load shifting target power requires energy-storage system standby and requirement management objectives power requirement energy-storage system charges, then is filled out with peak clipping
Paddy target power is instructed as the target power of energy-storage system.
In addition, being required deeply in requirement management objectives power requirement energy storage system discharges with discharging in two target powers
One as energy-storage system target power instruct.
Electric discharge requires the electric energy for deeply feeling bright requirement electric discharge big, that is to say, that the electric discharge of the first power requirement and the second power are wanted
Electric discharge is asked, if the second power discharge requires to show the absolute value that the absolute value of the second power is greater than the first power deeply, if with negative
Value is discharged to characterize, then the second power is less than the first power, if being discharged with positive value to characterize, the second power is greater than the first function
Rate.
In practical applications, if peak load shifting target power requires energy storage system discharges and requirement management objectives power requirement
Energy storage system discharges then require to discharge using in peak load shifting target power and requirement management objectives power most deep one as storing up
The target power instruction of energy system；Wherein, one of the maximum absolute value in two target powers is to require most deep one that discharges
It is a.
If peak load shifting target power requires energy-storage system standby and requirement management objectives power requirement energy storage system discharges,
Alternatively, peak load shifting target power require energy-storage system charging and requirement management objectives power requirement energy storage system discharges, then with
Requirement management objectives power is instructed as the target power of energy-storage system.
Here, when being negative with target power characterize target power requirement energy storage system discharges, with target power be 0 when characterize
Target power requires energy-storage system standby, characterizes target power as timing using target power and requires energy-storage system charging, foundation needs
Buret reason target power it is different with peak load shifting target power value 9 in cooperate with operating condition, the target power instruction of energy-storage system
It is illustrated, as follows:
(1) if PA is 0, PB 0, then PG=PA, due to PA=0, i.e. PG=0.
(2) if PA is negative, PB 0, then PG=PA.
(3) if PA is positive, PB 0, then PG=PA.
(4) if PA is positive, PB is positive, then PG=PA.
(5) if PA is negative, PB is positive, then PG=PA.
(6) if PA is that 0, PB is positive, then PG=A, due to PA=0, i.e. PG=0.
(7) if PA is negative, PB is negative, then PG=MIN [PA, PB].
(8) if PA is that 0, PB is negative, then PG=MIN [PA, PB], wherein PA=0, P < 0, then MIN [PA, PB]=PB.
(9) if PA is positive, PB is negative, then PG=MIN [PA, PB]=PB, wherein PA>0, P<0, then MIN [PA, PB]=
PB。
Wherein, PA is peak load shifting target power, and PB is requirement management objectives power, and PG is the target power of energy-storage system
Instruction, MIN [PA, PB] is the minimum value taken between PA and PB, that is, takes and require most deep one that discharges.
In the present embodiment, when SOC is greater than preset requirement for electric threshold value, energy-storage system is given under 9 kinds of operating conditions
Collaboration, and carry out different coordinated allocations according to 9 kinds of operating conditions, enable energy-storage system to be more bonded actual conditions and carry out phase
It should act, improve the economy of energy-storage system.
S104, be with requirement management objectives power it is preferential, determine energy-storage system target power instruction.
Specifically, require charging, requirement management objectives power requirement standby in peak load shifting target power, it is not full simultaneously
When sufficient, instructed using requirement management objectives power as the target power of energy-storage system.
In practical applications, if meeting in any one following situation: peak load shifting target power requires energy-storage system to wait for
Machine and requirement management objectives power requirement energy-storage system is standby, peak load shifting target power require energy storage system discharges and requirement pipe
Managing target power requires energy-storage system standby, and peak load shifting target power requires energy storage system discharges and requirement management objectives power
It is required that energy storage system discharges, peak load shifting target power requires energy-storage system standby and requirement management objectives power requirement energy storage system
System electric discharge, peak load shifting target power require energy-storage system charging and requirement management objectives power requirement energy storage system discharges, cut
Peak load target power requires energy-storage system charging and requirement management objectives power requirement energy-storage system charges, peak load shifting target
Power requirement energy storage system discharges and the charging of requirement management objectives power requirement energy-storage system, and, peak load shifting target power
It is required that energy-storage system is standby and requirement management objectives power requirement energy-storage system charges, then using requirement management objectives power as storage
The target power instruction of energy system.
In addition, if peak load shifting target power requires energy-storage system charging and requirement management objectives power requirement energy-storage system
It is standby, then it is instructed using peak load shifting target power as the target power of the energy-storage system.
Here, according to requirement management objectives power it is different with peak load shifting target power value 9 in cooperate with operating condition, to
Requirement management objectives power be it is preferential, determine energy-storage system target power instruction be illustrated, it is as follows:
(1) if PA is 0, PB 0, then PG=PB, due to PB=0, i.e. PG=0.
(2) if PA is negative, PB 0, then PG=PB, due to PB=0, i.e. PG=0.
(3) if PA is negative, PB is negative, then PG=PB.
(4) if PA is that 0, PB is negative, then PG=PB.
(5) if PA is positive, PB is negative, then PG=PB.
(6) if PA is positive, PB is positive, then PG=PB.
(7) if PA is negative, PB is positive, then PG=PB.
(8) if PA is that 0, PB is positive, then PG=PB.
(9) if PA is positive, PB 0, then PG=PA.
In the present embodiment, when SOC is less than or equal to preset requirement for electric threshold value, energy-storage system is given in 9 kinds of works
Collaboration under condition, and carry out different coordinated allocations according to 9 kinds of operating conditions, enable energy-storage system be more bonded actual conditions into
Row corresponding actions improve the economy of energy-storage system.
S105, the target power instruction according to energy-storage system, control energy-storage system execute corresponding movement.
Wherein, corresponding movement include: charging, electric discharge and it is standby in any one.
Specifically, if the target power instruction of energy-storage system requires energy-storage system to charge, energy-storage system charging, if energy storage
The target power instruction of system requires energy storage system discharges, then energy storage system discharges, if the target power instruction of energy-storage system is wanted
Ask energy-storage system standby, then energy-storage system is standby.
In the present embodiment, why the target power instruction of energy-storage system is worth and the SOC of energy-storage system, peak load shifting target
Power is related to requirement management objectives power, is not influenced by rate period, and no matter rate period is to be assisted which kind of period
With control；Also, it is instructed according to the target power of energy-storage system, control energy-storage system executes corresponding movement, so that energy storage system
The SOC of system indirectly controls energy-storage system and is charged, discharged or standby, avoid energy-storage system in advance by electricity discharge with electricity without
Method discharged completely and caused by battery configuring redundancy and energy-storage system it is not at full charge and cause energy-storage system utilization rate
It is low, so that energy-storage system total synergy controls, improve the economy of energy-storage system.
It optionally, in an alternative embodiment of the invention, referring to fig. 2, can be with included below before step S104:
S201, judge that the charging of requirement management objectives power requirement, peak load shifting target power require electric discharge and energy storage system
The SOC of system is in the dead zone range of the standby electric threshold value of requirement, if is met simultaneously.
This step S201 is to determine that the SOC of energy-storage system is less than or equal to the standby electric threshold value of preset requirement in above-mentioned steps S102
It executes afterwards, i.e., the SOC of energy-storage system is less than or equal to the standby electric threshold value of preset requirement in this step S201.
Therefore, the upper limit value of the dead zone range of the standby electric threshold value of requirement is the standby electric threshold value of requirement, and lower limit value is the standby electric threshold of requirement
Value subtracts the difference of fluctuation dead band value, wherein fluctuation dead band value can be 0.01, and specific value is not limited thereto, factually border
Depending on situation, within the scope of protection of this application.
If being not provided with the dead zone range of the standby electric threshold value of the requirement, in SOC in the standby electric Near Threshold small range fluctuation of requirement
When, cause unnecessary energy-storage system frequent charge to discharge, therefore, the dead zone range of the standby electric threshold value of setting requirement, in conjunction with subsequent
Step, so that when in the dead zone range of the standby electric threshold value of the requirement of energy-storage system, if the charging of requirement management objectives power requirement,
Peak load shifting target power requires electric discharge, then energy-storage system is not filled and do not put.And then energy-storage system frequent charge and discharge is avoided, it sends out
The phenomenon that raw conflict.
If the target power of requirement management requires charging, the target power requirement electric discharge of peak load shifting and energy-storage system
SOC is in the dead zone range of the standby electric threshold value of requirement, is met simultaneously, is thened follow the steps S202, if requirement management objectives power is wanted
The SOC of charging, peak load shifting target power requirement electric discharge and energy-storage system is asked to be in the dead zone range of the standby electric threshold value of requirement,
Do not meet simultaneously, thens follow the steps S104.
S202, using zero as energy-storage system target power instruct.
The target power instruction of energy-storage system is 0, then energy-storage system is not filled and do not put, i.e., energy-storage system enters standby mode.
At this point, even if the value of requirement management objectives power and peak load shifting target power is not 0, i.e., its require energy-storage system charge or
Electric discharge, energy-storage system, which does not fill still, not to be put.
In the present embodiment, by the dead zone range of the standby electric threshold value of setting requirement, avoid energy-storage system frequently charge with
The phenomenon that discharging and clashing.
Optionally, it on the basis of Fig. 1 or Fig. 2 of the embodiment of the present invention, (is opened up by taking Fig. 1 as an example herein referring to Fig. 3
Show), after step S103 and step S104, can with the following steps are included:
S301, judge whether the load requirement of energy-storage system is greater than threshold value.
In practical applications, threshold value is MAX [Qpcc, Q]-P.
Wherein, Qpcc is the real-time maximum demand of the commonly connected PCC point of energy-storage system, and Q is that the target of energy-storage system needs
Amount, P are the chargeable power of energy-storage system.
The purpose for judging whether the load requirement of energy-storage system is greater than threshold value is, is arranged and prevents super requirement boundary, if without anti-
Super requirement boundary is then likely to occur energy-storage system and executes peak load shifting target power and be peak load shifting target power when charging
The case where being greater than target requirement with the sum of load power, to reduce the economy of energy-storage system, therefore, executing step S301 can
To avoid the appearance of above situation, and then improve the economy of energy-storage system.
If the load requirement of energy-storage system is greater than threshold value, S302 is thened follow the steps, if the load requirement of energy-storage system is less than
Equal to threshold value, S303 is thened follow the steps.
S302, the target power instruction that energy-storage system is updated with zero.
This step S302 is identical as the implementation procedure of above-mentioned steps S202 and principle, and this is no longer going to repeat them.
S303, bounds checking is carried out to energy-storage system.
The SOC current to energy-storage system and target power instruction at least one carry out bounds checking, that is, determine SOC and/
Or whether target power instruction instructs in SOC and target power beyond corresponding pre- beyond in respectively corresponding preset range
If when range, if still executing corresponding movement with the target power of energy-storage system, being likely to result in energy-storage system super-charge super-discharge
The phenomenon that, therefore, the phenomenon that bounds checking can be to avoid energy-storage system super-charge super-discharge is carried out to energy-storage system.
Optionally, it may comprise steps of referring to fig. 4 in inventive embodiments Fig. 3 step S303:
S401, judge the current SOC of the energy-storage system whether be more than or equal to the default electric discharge cutoff value of energy-storage system and
Less than or equal to the preset charged cutoff value of energy-storage system.
If the SOC of energy-storage system is less than default electric discharge cutoff value, show that energy-storage system should not discharge again；If storage
The SOC of energy system is greater than preset charged cutoff value, then shows that energy-storage system should not charge again, otherwise energy-storage system can go out
The phenomenon that existing super-charge super-discharge.
Therefore, judge whether the SOC of energy-storage system is more than or equal to the default electric discharge cutoff value of energy-storage system, and be less than or equal to
The purpose of the preset charged cutoff value of energy-storage system is whether determine allows charge or discharge under energy-storage system current state,
The foundation of charge or discharge is provided for subsequent step.
If the SOC of energy-storage system is less than the default electric discharge cutoff value of energy-storage system or cuts greater than the preset charged of energy-storage system
Only it is worth, thens follow the steps S402, if the SOC of energy-storage system is more than or equal to preset electric discharge cutoff value and is less than or equal to preset fill
Electric cutoff value, thens follow the steps S105.
S402, the target power instruction that energy-storage system is updated with zero.
This step S402 is identical as the implementation procedure of above-mentioned steps S202 and principle, and this is no longer going to repeat them.
Optionally, referring to Fig. 5, after step S401, if it is determined that the SOC for energy-storage system is more than or equal to energy-storage system
Default electric discharge cutoff value, and be less than or equal to the preset charged cutoff value of energy-storage system, then can also include:
S501, judge whether the target power instruction of energy-storage system is more than or equal to the opposite of the available power of energy-storage system
Number, and it is less than or equal to the available power of energy-storage system.
Judge whether the target power instruction of energy-storage system is more than or equal to the opposite number of the available power of energy-storage system, and small
It is in the purpose for the available power for being equal to energy-storage system, determines that whether the target power of energy-storage system instructs in energy-storage system
Allow to contribute in range, in conjunction with subsequent step, if not being adjusted to target power instruction allowing to contribute in range, if
Do not allowing to contribute in range, then target power is being adjusted, is allowing to contribute in range to exceed to avoid energy-storage system
Power executes corresponding movement.
If the target power instruction of energy-storage system is less than the opposite number of the available power of energy-storage system, or is greater than energy-storage system
Available power, then follow the steps S502, if energy-storage system target power instruction be more than or equal to energy-storage system available power
Opposite number, and be less than or equal to energy-storage system available power, then execute in step S105.
S502, it is instructed with the target power that the product of the opposite number of available power and available power updates energy-storage system.
Here, by it is provided by the invention based on SOC management energy-storage system control method, in conjunction with actual use scene into
Row illustrates, as follows:
Fig. 6 e is the daily load curve of the enterprise uninterruptedly produced for 24 hours, hence it is evident that it can be seen that, the requirement peak of this kind of user can
Section at any time can occur.
Assuming that power station is configured to 1MW/5MWh.Charge and discharge strategy are as follows: be greater than the standby electricity of preset requirement in the SOC of energy-storage system
When threshold value, it is assumed that be 10%, with the 9 kinds of operating conditions collaboration provided in above-mentioned steps S103, determine that the target power of energy-storage system refers to
It enables, in SOC electric threshold value 10% standby lower than requirement, is cooperateed with the 9 kinds of operating conditions provided in above-mentioned steps S104 and determine energy-storage system
Target power instruction.
Specifically, it is the standby electric Near Threshold of the requirement, and setting fluctuation dead band value, if being not provided with fluctuation dead band value,
More than the standby electric threshold value of requirement, when such as SOC being 10.1%, if target power instruction requires electric discharge, energy storage system discharges are being stored up
Energy system discharge to less than the standby electric threshold value of requirement, such as SOC is 9.9%, if target power instruction requirement charging, energy-storage system
It is the problem of charging, such energy-storage system will appear frequent charge and discharge, frequent to solve energy-storage system by setting fluctuation dead band value
The problem of charge and discharge.
The income of energy-storage system are as follows: and 5MWh* (1-10%) * [(electricity price when electricity price-paddy when peak)+(electricity price-is usually electric when peak
Valence)]+1MW.
The embodiment of the invention provides one kind to manage volume energy-storage system based on SOC, referring to Fig. 7, comprising: energy-storage battery 20,
Battery management system 10, current transformer 30 and controller 40.
Energy-storage battery 20 is connected by current transformer 30 with power grid, controller 40 respectively with battery management system 10 and current transformer
30 are connected.
Battery management system 10, for acquiring the data information of energy-storage battery 20, and by collected energy-storage battery 20
Data information is sent to controller 40.
Controller 40, for executing the peak load shifting of energy-storage system described in any of the above-described embodiment and the association of requirement management
Same control method, specific implementation procedure and principle are referring to above-described embodiment, and this is no longer going to repeat them.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for system or
For system embodiment, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to method
The part of embodiment illustrates.System and system embodiment described above is only schematical, wherein the conduct
The unit of separate part description may or may not be physically separated, component shown as a unit can be or
Person may not be physical unit, it can and it is in one place, or may be distributed over multiple network units.It can root
According to actual need that some or all of the modules therein is selected to achieve the purpose of the solution of this embodiment.Ordinary skill
Personnel can understand and implement without creative efforts.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (11)
1. a kind of control method of the energy-storage system based on SOC management characterized by comprising
Obtain the requirement management objectives power and peak load shifting target power of the energy-storage system；
Judge whether the SOC of the energy-storage system is greater than the standby electric threshold value of preset requirement；
If the SOC of the energy-storage system is greater than the standby electric threshold value of the preset requirement, wanted in the requirement management objectives power
When the energy-storage system being asked to charge or is standby, it is subject to the peak load shifting target power, and in the requirement management objectives function
When rate requires the energy storage system discharges, electric discharge in two target powers of being subject to requires deep one, determines the energy storage system
The target power of system instructs；
If the SOC of the energy-storage system is less than or equal to the standby electric threshold value of the preset requirement, with the requirement management objectives function
Rate be it is preferential, determine the energy-storage system target power instruction；
Target power according to the energy-storage system instructs, and controls the energy-storage system and executes corresponding movement；It is corresponding
Movement include: charging, electric discharge and it is standby in any one.
2. the control method of the energy-storage system according to claim 1 based on SOC management, which is characterized in that if the storage
The SOC of energy system is greater than the standby electric threshold value of the preset requirement, then the energy storage system described in the requirement management objectives power requirement
System charging or it is standby when, be subject to the peak load shifting target power, comprising:
When the SOC of the energy-storage system is greater than the preset requirement for electric threshold value, if meeting any one following situation: institute
State that peak load shifting target power requirement energy-storage system is standby and the requirement management objectives power requirement energy-storage system is standby, it is described
Peak load shifting target power requires energy storage system discharges and the requirement management objectives power requirement energy-storage system is standby, described to cut
Peak load target power requires energy-storage system charging and the requirement management objectives power requirement energy-storage system is standby, the peak clipping
Valley-fill target power requires energy-storage system charging and the requirement management objectives power requirement energy-storage system charges, and the peak clipping is filled out
Paddy target power requires energy storage system discharges and the requirement management objectives power requirement energy-storage system charges, and, it is described to cut
Peak load target power requires energy-storage system standby and the requirement management objectives power requirement energy-storage system charging, then with peak clipping
Valley-fill target power is instructed as the target power of the energy-storage system.
3. the control method of the energy-storage system according to claim 1 based on SOC management, which is characterized in that if the storage
The SOC of energy system is greater than the standby electric threshold value of the preset requirement, then the energy storage system described in the requirement management objectives power requirement
When system electric discharge, electric discharge in two target powers of being subject to requires deep one, comprising:
When the SOC of the energy-storage system is greater than the preset requirement for electric threshold value, if the peak load shifting target power is wanted
Energy storage system discharges and the requirement management objectives power requirement energy storage system discharges are asked, then with the peak load shifting target power
It is instructed with a target power as the energy-storage system for requiring electric discharge most deep in the requirement management objectives power；Its
In, one of the maximum absolute value in two target powers is to require most deep one that discharges；
When the SOC of the energy-storage system is greater than the preset requirement for electric threshold value, if the peak load shifting target power is wanted
Ask energy-storage system standby and the requirement management objectives power requirement energy storage system discharges, alternatively, the peak load shifting target function
Rate requires energy-storage system charging and the requirement management objectives power requirement energy storage system discharges, then with the requirement management objectives
Power is instructed as the target power of the energy-storage system.
4. the control method of the energy-storage system according to claim 1 based on SOC management, which is characterized in that if the storage
Can the SOC of system be less than or equal to the standby electric threshold value of the preset requirement, then be with the requirement management objectives power it is preferential, it is determining
The target power of the energy-storage system instructs, comprising:
When the SOC of the energy-storage system is less than or equal to the standby electric threshold value of the preset requirement, if meet it is following any one
Situation: the peak load shifting target power requires energy-storage system standby and the requirement management objectives power requirement energy-storage system waits for
Machine, the peak load shifting target power requires energy storage system discharges and the requirement management objectives power requirement energy-storage system waits for
Machine, the peak load shifting target power requires energy storage system discharges and the requirement management objectives power requirement energy-storage system is put
Electricity, the peak load shifting target power requires energy-storage system standby and the requirement management objectives power requirement energy-storage system is put
Electricity, the peak load shifting target power requires energy-storage system charging and the requirement management objectives power requirement energy-storage system is put
Electricity, the peak load shifting target power requires energy-storage system charging and the requirement management objectives power requirement energy-storage system fills
Electricity, the peak load shifting target power requires energy storage system discharges and the requirement management objectives power requirement energy-storage system fills
Electricity, and, the peak load shifting target power requires energy-storage system standby and requirement management objectives power requirement energy storage system
System charging, then instruct using the requirement management objectives power as the target power of the energy-storage system.
5. the control method of the energy-storage system according to claim 4 based on SOC management, which is characterized in that with the need
Buret reason target power be it is preferential, determine the energy-storage system target power instruct, further includes:
If the peak load shifting target power requires energy-storage system charging and the requirement management objectives power requirement energy-storage system
It is standby, then it is instructed using the peak load shifting target power as the target power of the energy-storage system.
6. the control method of -5 any energy-storage systems based on SOC management according to claim 1, which is characterized in that In
Be with the requirement management objectives power it is preferential, determine the energy-storage system target power instruction before, further includes:
Judge the charging of requirement management objectives power requirement, peak load shifting target power requirement electric discharge and the energy-storage system
SOC is in the dead zone range of the standby electric threshold value of requirement, if is met simultaneously；
If the charging of requirement management objectives power requirement, peak load shifting target power require the SOC of electric discharge and the energy-storage system
In dead zone range in the standby electric threshold value of requirement, meet simultaneously, then using the zero target power instruction as the energy-storage system；
If the charging of requirement management objectives power requirement, peak load shifting target power require the SOC of electric discharge and the energy-storage system
In dead zone range in the standby electric threshold value of requirement, do not meet simultaneously, then execution is described is with the requirement management objectives power
Preferentially, the step of determining the target power instruction of the energy-storage system.
7. the control method of -5 any energy-storage systems based on SOC management according to claim 1, which is characterized in that In
After the target power of the determination energy-storage system, further includes:
Judge whether the load requirement of the energy-storage system is greater than threshold value；
If the load requirement of the energy-storage system is greater than threshold value, the target power for updating the energy-storage system with zero is instructed；
If the load requirement of the energy-storage system is less than or equal to threshold value, bounds checking is carried out to the energy-storage system.
8. the control method of the energy-storage system according to claim 7 based on SOC management, which is characterized in that the threshold value
For MAX [Qpcc, Q]-P；
Wherein, Qpcc is the real-time maximum demand of the commonly connected PCC point of the energy-storage system, and Q is the mesh of the energy-storage system
Requirement is marked, P is the chargeable power of the energy-storage system.
9. the control method of the energy-storage system according to claim 7 based on SOC management, which is characterized in that described to institute
It states energy-storage system and carries out bounds checking, comprising:
Judge whether the SOC of the energy-storage system is more than or equal to the default electric discharge cutoff value of energy-storage system and is less than or equal to preset
Charge cutoff value；
If the SOC of the energy-storage system is less than preset electric discharge cutoff value or is greater than preset charge cutoff value, updated with zero
The target power of the energy-storage system instructs.
10. the control method of the energy-storage system according to claim 9 based on SOC management, which is characterized in that sentence described
Break the energy-storage system SOC whether be more than or equal to preset electric discharge cutoff value and be less than or equal to preset charge cutoff value it
Afterwards, if the SOC of the energy-storage system is more than or equal to preset electric discharge cutoff value and is less than or equal to preset charge cutoff value, also
Include:
Judge whether the target power instruction of the energy-storage system is more than or equal to the opposite number of the available power of the energy-storage system,
And it is less than or equal to the available power of the energy-storage system；
If the target power instruction of the energy-storage system is less than the opposite number of the available power of the energy-storage system, or is greater than described
The available power of energy-storage system then updates the energy-storage system with the product of the opposite number of the available power and the available power
Target power instruction.
11. a kind of energy-storage system based on SOC management characterized by comprising energy-storage battery, battery management system, current transformer
And controller；
The energy-storage battery is connected by current transformer with power grid；
The controller is connected with the battery management system and the current transformer respectively；
The battery management system, for acquiring the data information of the energy-storage battery, and by the number of collected energy-storage battery
It is believed that breath is sent to the controller；
The controller, for executing the controlling party of the energy-storage system based on SOC management as described in claim 1-10 is any
Method.
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| CN111740481A (en) * | 2020-08-19 | 2020-10-02 | 江苏慧智能源工程技术创新研究院有限公司 | Energy storage system EMS charging control method |
| CN112865157A (en) * | 2021-03-25 | 2021-05-28 | 阳光新能源开发有限公司 | Hybrid power station and new energy power generation power prediction deviation compensation method thereof |
| CN113049961A (en) * | 2021-02-26 | 2021-06-29 | 佛山职业技术学院 | DZSOC algorithm of lithium iron phosphate battery |
| CN116191515A (en) * | 2023-03-28 | 2023-05-30 | 上海艾临科智能科技有限公司 | Charging and discharging parameter control method and device for alternating-current side energy storage device and electronic equipment |
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