CN109449986A - Stabilize control method, photovoltaic plant and storage medium that photovoltaic plant goes out fluctuation - Google Patents
Stabilize control method, photovoltaic plant and storage medium that photovoltaic plant goes out fluctuation Download PDFInfo
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- 238000001514 detection method Methods 0.000 claims description 11
- 238000009825 accumulation Methods 0.000 claims description 9
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The embodiment of the invention discloses a kind of control method, photovoltaic plant and storage mediums stabilized photovoltaic plant and go out fluctuation, this method comprises: obtaining the photovoltaic plant output power value and the battery group state-of-charge at the first moment at the first moment；According to the photovoltaic plant output power value at the first moment of acquisition, smoothed out photovoltaic electric station grid connection reference value is calculated；Compare the first moment photovoltaic plant output power value and smoothed out photovoltaic electric station grid connection reference value；The instruction of control energy-storage system charge and discharge is determined according to comparison result；Set stability bandwidth correction factor and battery group state-of-charge correction factor；According to stability bandwidth correction factor and battery group state-of-charge correction factor, the output power value at the first moment of energy-storage system is calculated.The embodiment of the present invention can be realized the charge and discharge power output of coordinated control energy-storage system, and smooth photovoltaic plant output power reduces influence of the photovoltaic plant power swing to power grid, and extends battery life, reduce system O&M cost.
Description
Technical field
The present embodiments relate to technical field of new energy power generation, stabilize photovoltaic plant more particularly to one kind and go out fluctuation
Control method, photovoltaic plant and storage medium.
Background technique
With the continuous development of new energy, the large-scale grid connection of photovoltaic plant, power output fluctuation problem is got worse.Due to
Photovoltaic belongs to renewable energy, and the size of power output is influenced by factors such as weather, landform, illumination, leads to its power output not
Certainty, the size of power output can not be always maintained at constant, and are to change in many degree at any time, have very strong interval
Property, randomness the features such as, with photovoltaic permeability be continuously improved, bring huge challenge to the safe and reliable operation of power grid.With
Ratio of the photovoltaic electric station grid connection in power grid be continuously increased, the smooth control of photovoltaic plant output power is increasingly closed
Note.With the continuous development of battery and its integrated technology, goes out fluctuation using the smooth photovoltaic plant of energy-storage system and be increasingly becoming
A kind of feasible program.
During carrying out innovation and creation, the inventors found that: the unreasonable of energy storage control will lead to system
Service condition is out-of-limit, is not only unable to satisfy Practical Project demand, while extremely shortening the service life of energy-storage system, from
For the angle of battery, excessive charge and discharge can reduce the service life of battery, and then increase the O&M cost of system.
Summary of the invention
In view of this, the embodiment of the invention provides it is a kind of stabilize photovoltaic plant go out fluctuation control method,
Photovoltaic plant and storage medium, the unreasonable system operation conditions that will lead to solve energy storage control are out-of-limit, with
And battery overcharges or the technical issues of over-discharge is impacted to battery life.
To solve the above-mentioned problems, the embodiment of the present invention mainly provides the following technical solutions:
In a first aspect, the embodiment of the invention provides a kind of control method stabilized photovoltaic plant and go out fluctuation, the side
Method includes:
Obtain the photovoltaic plant output power value at the first moment and the battery group state-of-charge at the first moment；
According to the photovoltaic plant output power value at the first moment of acquisition, smoothed out photovoltaic electric station grid connection reference is calculated
Value；
Compare the first moment photovoltaic plant output power value and smoothed out photovoltaic electric station grid connection reference value；
The charge and discharge instruction at control the first moment of energy-storage system is determined according to comparison result；
The maxima and minima for calculating the photovoltaic plant output power between the first moment and the second moment, according to calculating
Maxima and minima and photovoltaic installed capacity, calculate photovoltaic plant output-power fluctuation rate；According to the stability bandwidth of calculating,
Set stability bandwidth correction factor；Second moment is earlier than the first moment；
According to the battery group state-of-charge at the first moment of acquisition, battery group state-of-charge correction factor is set；
According to stability bandwidth correction factor and battery group state-of-charge correction factor, control the first moment of energy-storage system is calculated
Output power value.
Second aspect, the embodiment of the invention also provides a kind of photovoltaic plants, comprising: photovoltaic system, energy-storage system, exchange
Bus and controller；Photovoltaic system and energy-storage system are connect with ac bus respectively；Ac bus passes through step-up transformer and electricity
Net connection；Ac bus outlet side is equipped with photovoltaic plant output power detection unit；Photovoltaic system includes the photovoltaic hair of electrical connection
Electric array and photovoltaic DC-to-AC converter；Energy-storage system includes battery group, energy accumulation current converter and the battery group state-of-charge of electrical connection
Detection unit；Photovoltaic plant output power detection unit is used to detect the output power of photovoltaic plant and is transferred to controller；Lotus
Electricity condition detection unit is for detecting battery group state-of-charge and being transferred to controller；Controller includes processor and storage
Device, processor are electrically connected with memory；Processor is used to call program instruction in memory, to execute the embodiment of the present invention the
On the one hand the control method stabilized photovoltaic plant and go out fluctuation provided.
The third aspect, the embodiment of the invention also provides a kind of non-transient computer readable storage medium, the non-transient meters
Calculation machine readable storage medium storing program for executing stores computer instruction, and computer instruction makes computer execute the offer of first aspect of the embodiment of the present invention
The control method stabilized photovoltaic plant and go out fluctuation.
By above-mentioned technical proposal, technical solution provided in an embodiment of the present invention is at least had the advantage that
1, by carrying out the photovoltaic plant output power value at the first moment and smoothed out photovoltaic electric station grid connection reference value
Compare, energy-storage system charge and discharge are controlled according to comparison result, reaches real-time monitoring photovoltaic plant power output situation, coordinated control energy storage
The purpose that photovoltaic plant goes out fluctuation is stabilized in system charge and discharge；
2, the control strategy that photovoltaic plant goes out fluctuation is stabilized in the energy storage based on double feedbacks, passes through setting stability bandwidth amendment system
Several and battery group state-of-charge correction factor, and according to stability bandwidth correction factor and battery group state-of-charge correction factor,
The output power value for calculating the first moment of energy-storage system, reaches coordinated control energy-storage system charge and discharge, stabilizes photovoltaic plant power output
Fluctuation, and extend battery life, and then reduce system O&M cost.
Above description is only the general introduction of technical solution of the embodiment of the present invention, in order to better understand the embodiment of the present invention
Technological means, and can be implemented in accordance with the contents of the specification, and in order to allow above and other mesh of the embodiment of the present invention
, feature and advantage can be more clearly understood, the special specific embodiment for lifting the embodiment of the present invention below.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
The limitation of embodiment.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 shows a kind of control method process stabilized photovoltaic plant and go out fluctuation provided by one embodiment of the present invention
Schematic diagram；
Fig. 2 shows a kind of method flow signals for setting stability bandwidth correction factor provided by one embodiment of the present invention
Figure；
Fig. 3 shows a kind of photovoltaic plant structure and schematic illustration of further embodiment of this invention offer.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.
In a first aspect, a kind of control method stabilized photovoltaic plant and go out fluctuation provided by one embodiment of the present invention, such as
Shown in Fig. 1, this method comprises:
S101, the photovoltaic plant output power value and the battery group state-of-charge at the first moment for obtaining for the first moment；
S102, the photovoltaic plant output power value according to the first moment of acquisition, calculate smoothed out photovoltaic electric station grid connection
Reference value；
S103, the photovoltaic plant output power value for comparing for the first moment and smoothed out photovoltaic electric station grid connection reference value；
S104, determine that the charge and discharge at control the first moment of energy-storage system are instructed according to comparison result；
The maxima and minima of photovoltaic plant output power between S105, the first moment of calculating and the second moment, root
Maxima and minima and photovoltaic installed capacity according to calculating calculate photovoltaic plant output-power fluctuation rate；According to calculating
Stability bandwidth sets stability bandwidth correction factor；Second moment is earlier than the first moment；
S106, the battery group state-of-charge according to the first moment of acquisition, setting battery group state-of-charge amendment system
Number；
S107, according to stability bandwidth correction factor and battery group state-of-charge correction factor, calculate control energy-storage system the
The output power value at one moment.
In fact, the first step of above-mentioned steps S103-S104 combines, combined with the second step of step S105-S107
Between be not present stringent execution ordinal relation.First step combination is combined with second step and be may be performed simultaneously, can also be
A step combination is first carried out, is combined in rear another step of execution.
Using the technical solution of the embodiment of the present invention, at least have the following beneficial effects:
1, by carrying out the photovoltaic plant output power value at the first moment and smoothed out photovoltaic electric station grid connection reference value
Compare, energy-storage system charge and discharge are controlled according to comparison result, reaches real-time monitoring photovoltaic plant power output situation, coordinated control energy storage
The purpose that photovoltaic plant goes out fluctuation is stabilized in system charge and discharge；
2, the control strategy that photovoltaic plant goes out fluctuation is stabilized in the energy storage based on double feedbacks, passes through setting stability bandwidth amendment system
Several and battery group state-of-charge correction factor, and according to stability bandwidth correction factor and battery group state-of-charge correction factor,
The output power value for calculating the first moment of energy-storage system, reaches coordinated control energy-storage system charge and discharge, stabilizes photovoltaic plant power output
Fluctuation, and extend battery life, and then reduce system O&M cost.
Optionally, a kind of photovoltaic plant of stabilizing provided by the embodiments of the present application goes out in the control method of fluctuation, in S102
According to the photovoltaic plant output power value at the first moment of acquisition, smoothed out photovoltaic electric station grid connection reference value, Ke Yiyou are calculated
Numerous embodiments, one of optional embodiment are as follows:
Smoothed out photovoltaic electric station grid connection reference value is calculated using low-pass filtering algorithm, calculation formula is as follows:
Wherein, PgridFor smoothed out photovoltaic electric station grid connection reference value, PpvPhotovoltaic plant for the first moment of acquisition is defeated
Performance number out, TsFor time constant filter.
Optionally, a kind of photovoltaic plant of stabilizing provided by the embodiments of the present application goes out in the control method of fluctuation, in S104
The charge and discharge instruction that control the first moment of energy-storage system is determined according to comparison result, specifically includes:
If smoothed out photovoltaic electric station grid connection reference value is greater than the photovoltaic plant output power value at the first moment, it is determined that control
The instruction at the first moment of energy-storage system processed is electric discharge instruction；
If smoothed out photovoltaic electric station grid connection reference value is less than the photovoltaic plant output power value at the first moment, it is determined that control
The instruction at the first moment of energy-storage system processed is charging instruction.
Optionally, a kind of photovoltaic plant of stabilizing provided by the embodiments of the present application goes out in the control method of fluctuation, in S105
The maxima and minima for calculating the photovoltaic plant output power between the first moment and the second moment, according to the maximum value of calculating
With minimum value and photovoltaic installed capacity, photovoltaic plant output-power fluctuation rate is calculated；According to the stability bandwidth of calculating, setting fluctuation
Rate correction factor, can be there are many embodiment, and the flow diagram of one of optional embodiment is as shown in Fig. 2, packet
It includes:
The maxima and minima of photovoltaic plant output power between S201, the first moment of calculating and the second moment.
For example, calculating the maximum value of the photovoltaic plant output power between the first moment and the second moment by following formula
With minimum value:
Wherein,The maximum value of photovoltaic plant output power between the first moment and the second moment of calculating,The minimum value of photovoltaic plant output power between the first moment and the second moment of calculating, t represented for the first moment,
T-n+1 represented for the second moment, and the first moment can be current time, and the second moment, t was real number earlier than the first moment, and n is setting
Value, and n is more than or equal to 1.
S202, the maxima and minima according to calculating and photovoltaic installed capacity calculate photovoltaic plant output power wave
Dynamic rate.
For example, calculating photovoltaic plant output-power fluctuation rate by following formula:
Wherein, α is photovoltaic plant output-power fluctuation rate, CpvFor photovoltaic installed capacity.
S203, the stability bandwidth according to calculating set stability bandwidth correction factor.
Compare photovoltaic plant output-power fluctuation rate and the preset maximum allowable stability bandwidth of photovoltaic plant output power:
If photovoltaic plant output-power fluctuation rate is less than the preset maximum allowable stability bandwidth of photovoltaic plant output power, setting
δ=0.
If photovoltaic plant output-power fluctuation rate is greater than or equal to the preset maximum allowable fluctuation of photovoltaic plant output power
Rate, setting
Wherein, δ is stability bandwidth correction factor, PmaxFor the maximum allowable output power of preset photovoltaic plant.
For achieve the purpose that extend battery life, reduce energy-storage system O&M cost, to battery operating status into
Mobile state monitoring carries out dynamic corrections to energy-storage system output power, makes battery-operated in optimum state.To realize above-mentioned function
Can, by the way that battery group state-of-charge correction factor is arranged, adjust energy-storage system power output value.It acts as: if battery
Group state-of-charge numerical value is larger, and when battery group needs to discharge, then increase discharge power.If battery group state-of-charge numerical value
It is larger, and when battery group needs to charge, then reduce charge power.If battery group state-of-charge numerical value is smaller, and battery
Group needs to discharge, then reduces discharge power.If battery group state-of-charge numerical value is smaller, and when battery group needs to charge, then
Increase charge power.Therefore, the battery group state-of-charge correction factor in the embodiment of the present invention is obtained by following strategies.
Optionally, a kind of photovoltaic plant of stabilizing provided by the embodiments of the present application goes out in the control method of fluctuation, in S106
Battery group state-of-charge correction factor is set according to the battery group state-of-charge at the first moment of acquisition, it can there are many real
Apply mode, one of optional embodiment are as follows:
According to preset multiple charge and discharge sections, filled locating for the battery group state-of-charge for determining the first moment obtained
Discharge range；
According to determining charge and discharge section, battery group state-of-charge correction factor is set.
In the present embodiment, by the way that battery group state-of-charge is divided into five charge and discharge sections in advance in memory,
Respectively the first charge and discharge section [100%, SOCmax], the second charge and discharge section [SOCmax, SOChigh], third charge and discharge section
[SOChigh, SOClow], the 4th charge and discharge section [SOClow, SOCmin] and the 5th charge and discharge section [SOCmin, 0%].
Optionally, in above-described embodiment, according to determining charge and discharge section, battery group state-of-charge amendment system is set
Number, can be there are many embodiment, one of optional embodiment are as follows:
According to determining charge and discharge section, battery group state-of-charge correction factor is set, comprising:
When determining charge and discharge section is the first charge and discharge section, the photovoltaic plant output power value at the first moment is judged
Whether smoothed out photovoltaic electric station grid connection reference value is greater than, if so, setting ρ=0；If it is not, setting ρ=SOC (t)-SOChigh。
When determining charge and discharge section is the second charge and discharge section, ρ=SOC (t)-SOC is sethigh。
When determining charge and discharge section is third charge and discharge section, ρ=0 is set.
When determining charge and discharge section is the 4th charge and discharge section, ρ=SOC (t)-SOC is setlow。
When determining charge and discharge section is the 5th charge and discharge section, the photovoltaic plant output power value at the first moment is judged
Whether smoothed out photovoltaic electric station grid connection reference value is greater than；If so, setting ρ=SOC (t)-SOClow；If it is not, setting ρ=0.
Wherein, ρ is battery group state-of-charge correction factor, and SOC (t) is battery group state-of-charge at the first moment
Instantaneous value, SOChighFor the lower limit value of the second charge and discharge section state-of-charge or the upper limit of third charge and discharge section state-of-charge
Value, SOClowFor the lower limit value of third charge and discharge section state-of-charge or the upper limit value of the 4th charge and discharge section state-of-charge.
Optionally, a kind of photovoltaic plant of stabilizing provided by the embodiments of the present application goes out in the control method of fluctuation, in S107
According to stability bandwidth correction factor and battery group state-of-charge correction factor, the output work at control the first moment of energy-storage system is calculated
Rate value, can be there are many embodiment, one of optional embodiment are as follows:
According to stability bandwidth correction factor and battery group state-of-charge correction factor, control the first moment of energy-storage system is calculated
Output power value, calculated by following formula:
PbatcmdIt (t) is the output power value at the first moment of energy-storage system, Pbat_base(t)=Pgrid-Ppv, Pbat_base(t)
For the base value of the output power at the first moment of energy-storage system；Ppcs_rateFor the rated capacity of energy accumulation current converter, δ is stability bandwidth amendment
Coefficient, ρ are battery group state-of-charge correction factor, and t represented for the first moment, and the first moment can be current time.
Using the technical solution of the embodiment of the present invention, at least have the following beneficial effects:
1, by carrying out the photovoltaic plant output power value at the first moment and smoothed out photovoltaic electric station grid connection reference value
Compare, energy-storage system charge and discharge are controlled according to comparison result, reaches real-time monitoring photovoltaic plant power output situation, coordinated control energy storage
The purpose that photovoltaic plant goes out fluctuation is stabilized in system charge and discharge；
2, the control strategy that photovoltaic plant goes out fluctuation is stabilized in the energy storage based on double feedbacks, passes through setting stability bandwidth amendment system
Several and battery group state-of-charge correction factor, and according to stability bandwidth correction factor and battery group state-of-charge correction factor,
The output power value for calculating the first moment of energy-storage system, reaches coordinated control energy-storage system charge and discharge, stabilizes photovoltaic plant power output
Fluctuation, and extend battery life, and then reduce system O&M cost.
Second aspect is based on identical inventive concept, as shown in figure 3, further embodiment of this invention provides a kind of photovoltaic
Power station, comprising: photovoltaic system, energy-storage system, ac bus and controller.Photovoltaic system and energy-storage system respectively with ac bus
Connection, ac bus are connect by step-up transformer with power grid.Ac bus outlet side is detected equipped with photovoltaic plant output power
Unit, photovoltaic system include the photovoltaic power generation array and photovoltaic DC-to-AC converter of electrical connection, and energy-storage system includes the battery of electrical connection
Group, energy accumulation current converter and battery group state-of-charge detection unit.Photovoltaic plant output power detection unit is for detecting photovoltaic
The output power in power station is simultaneously transferred to controller, and state-of-charge detection unit is for detecting battery group state-of-charge and being transferred to
Controller.Controller includes processor and memory, and processor is electrically connected with memory, and processor is for calling in memory
Program instruction, to execute the control method of first aspect of embodiment of the present invention offer stabilized photovoltaic plant and go out fluctuation.
In the embodiment of the present invention, by determining that charge and discharge of the storage system at the first moment instruct, control energy-storage system fills
Electric discharge, and by calculating energy-storage system in the output power value at the first moment, to control the output power of energy-storage system, from
And realize the fluctuation out for stabilizing photovoltaic plant.
Optionally, energy accumulation current converter is bidirectional converter in the embodiment of the present invention, when controlling energy-storage system charging, energy storage
It after current transformer is rectified the alternating current of power grid, charges to battery group, when controlling energy storage system discharges, energy storage becomes
It is power grid power supply that the DC inverter of battery group is alternating current by stream device.
Memory in the embodiment of the present invention can be ROM (Read-Only Memory, read-only memory) or can store
The other kinds of static storage device of static information and instruction, can be RAM, (Random Access Memory, is deposited at random
Access to memory) or the other kinds of dynamic memory of information and instruction can be stored, it is also possible to EEPROM
(Electrically Erasable Programmable Read Only Memory, Electrically Erasable Programmable Read-Only Memory),
CD-ROM (Compact Disc Read-Only Memory, CD-ROM) or other optical disc storages, optical disc storage (including pressure
Contracting optical disc, laser disc, optical disc, Digital Versatile Disc, Blu-ray Disc etc.), magnetic disk storage medium or other magnetic storage apparatus or
Person can be used in the desired program code of carrying or storage with instruction or data structure form and can be by computer access
Any other medium, but not limited to this.
Processor in the embodiment of the present invention can be CPU (Central Processing Unit, central processing unit),
General processor, DSP (Digital Signal Processor, data signal processor), ASIC (Application
Specific Integrated Circuit, specific integrated circuit), FPGA (Field-Programmable Gate
Array, field programmable gate array) either other programmable logic device, transistor logic, hardware component or its
Meaning combination.Its may be implemented or execute combine the disclosure of invention described in various illustrative logic blocks, module and
Circuit.Processor is also possible to realize the combination of computing function, such as combines comprising one or more microprocessors, DSP and micro-
The combination etc. of processor.
It will be understood by those skilled in the art that the memory in a kind of optional embodiment, in the embodiment of the present invention
At least one can be configured with processor.
Since the photovoltaic plant that the present embodiment is introduced is that can execute the photovoltaic plant of stabilizing in the embodiment of the present invention to go out
The device of the control method of fluctuation, so based on the control stabilized photovoltaic plant described in the embodiment of the present invention and go out fluctuation
Method processed, those skilled in the art can understand the specific embodiment and its various change of the photovoltaic plant of the present embodiment
Change form, so how to realize the control stabilized photovoltaic plant and go out fluctuation in the embodiment of the present invention for the photovoltaic plant at this
Method processed is no longer discussed in detail, as long as stabilizing photovoltaic plant in those skilled in the art's implementation embodiment of the present invention goes out Reeb
Device used by dynamic control method or equipment belong to the range to be protected of the application.
The third aspect, is based on identical inventive concept, and yet another embodiment of the invention additionally provides a kind of non-transient computer
Readable storage medium storing program for executing, the non-transient computer readable storage medium store computer instruction, and computer instruction executes computer
The control method stabilized photovoltaic plant and go out fluctuation that first aspect of the embodiment of the present invention provides.
Computer-readable medium includes but is not limited to any kind of disk (including floppy disk, hard disk, CD, CD-ROM and magnetic
CD), (Erasable Programmable Read-Only Memory, erasable programmable is read-only to be deposited by ROM, RAM, EPROM
Reservoir), EEPROM, flash memory, magnetic card or light card.It is, readable medium include by equipment (for example, computer) with
Any medium for the form storage or transmission information that can be read.
The inventive concept of photovoltaic plant provided in an embodiment of the present invention and non-transient computer readable storage medium with can be real
Existing beneficial effect is identical as each method embodiment above-mentioned, and details are not described herein.
Those skilled in the art have been appreciated that in the present invention the various operations crossed by discussion, method, in process
Steps, measures, and schemes can be replaced, changed, combined or be deleted.Further, each with having been crossed by discussion in the present invention
Kind of operation, method, other steps, measures, and schemes in process may also be alternated, changed, rearranged, decomposed, combined or deleted.
Further, in the prior art to have and the step in various operations, method disclosed in the present invention, process, measure, scheme
It may also be alternated, changed, rearranged, decomposed, combined or deleted.
It should be understood that although each step in the flow chart of attached drawing is successively shown according to the instruction of arrow,
These steps are not that the inevitable sequence according to arrow instruction successively executes.Unless expressly stating otherwise herein, these steps
Execution there is no stringent sequences to limit, can execute in the other order.Moreover, at least one in the flow chart of attached drawing
Part steps may include that perhaps these sub-steps of multiple stages or stage are not necessarily in synchronization to multiple sub-steps
Completion is executed, but can be executed at different times, execution sequence, which is also not necessarily, successively to be carried out, but can be with other
At least part of the sub-step or stage of step or other steps executes in turn or alternately.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide for method, apparatus, equipment (system) or
Computer program product.Therefore, the present invention can be used complete hardware embodiment, complete software embodiment or in conjunction with software and firmly
The form of embodiment in terms of part.Moreover, it wherein includes computer available programs generation that the present invention, which can be used in one or more,
The meter implemented in the computer-usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) of code
The form of calculation machine program product.
The present invention referring to according to the method for the embodiment of the present invention, device, equipment (system) and computer program product
Flowchart and/or the block diagram describes.It should be understood that can be realized by computer program instructions every in flowchart and/or the block diagram
The combination of process and/or box in one process and/or box and flowchart and/or the block diagram.It can provide these computers
Processor of the program instruction to general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices
To generate a machine, so that generating use by the instruction that computer or the processor of other programmable data processing devices execute
In the dress for realizing the function of specifying in one or more flows of the flowchart and/or one or more blocks of the block diagram
It sets.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
It should also be noted that, the terms "include", "comprise" or its any other variant are intended to nonexcludability
It include so that the process, method, commodity or the equipment that include a series of elements not only include those elements, but also to wrap
Include other elements that are not explicitly listed, or further include for this process, method, commodity or equipment intrinsic want
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including element
There is also other identical elements in process, method, commodity or equipment.
The above is only the embodiment of the present invention, are not intended to restrict the invention.To those skilled in the art,
The invention may be variously modified and varied.It is all within the spirit and principles of the present invention made by any modification, equivalent replacement,
Improve etc., it should be included within scope of the presently claimed invention.
Claims (10)
1. a kind of control method stabilized photovoltaic plant and go out fluctuation, which is characterized in that the described method includes:
Obtain the photovoltaic plant output power value at the first moment and the battery group state-of-charge at the first moment；
According to the photovoltaic plant output power value at the first moment of the acquisition, smoothed out photovoltaic electric station grid connection reference is calculated
Value；
Compare first moment photovoltaic plant output power value and the smoothed out photovoltaic electric station grid connection reference value；
The charge and discharge instruction at control the first moment of energy-storage system is determined according to comparison result；
The maxima and minima for calculating the photovoltaic plant output power between the first moment and the second moment, according to the calculating
Maxima and minima and photovoltaic installed capacity, calculate photovoltaic plant output-power fluctuation rate；According to the wave of the calculating
Dynamic rate, sets stability bandwidth correction factor；Second moment is earlier than the first moment；
According to the battery group state-of-charge at the first moment of the acquisition, battery group state-of-charge correction factor is set；
According to the stability bandwidth correction factor and the battery group state-of-charge correction factor, the control energy-storage system is calculated
The output power value at the first moment.
2. control method according to claim 1, which is characterized in that the photovoltaic plant at first moment according to acquisition
Output power value calculates smoothed out photovoltaic electric station grid connection reference value, comprising: calculate by following formula:
PgridFor smoothed out photovoltaic electric station grid connection reference value, PpvFor the photovoltaic plant output power value at the first moment of acquisition, Ts
For time constant filter.
3. control method according to claim 1, which is characterized in that described to determine control energy-storage system according to comparison result
The charge and discharge at the first moment instruct, comprising:
If the smoothed out photovoltaic electric station grid connection reference value is greater than the photovoltaic plant output power value at first moment, really
Surely the instruction for controlling the first moment of energy-storage system is electric discharge instruction；
If the smoothed out photovoltaic electric station grid connection reference value is less than the photovoltaic plant output power value at first moment, really
Surely the instruction for controlling the first moment of energy-storage system is charging instruction.
4. control method according to claim 1, which is characterized in that the maxima and minima according to calculating and
Photovoltaic installed capacity calculates photovoltaic plant output-power fluctuation rate, according to the stability bandwidth of calculating, sets stability bandwidth correction factor,
Include:
Photovoltaic plant output-power fluctuation rate is calculated by following formula:
α is photovoltaic plant output-power fluctuation rate；CpvFor photovoltaic installed capacity,WithRespectively calculate first when
Carve the maxima and minima of the photovoltaic plant output power between the second moment；
Compare the big of the photovoltaic plant output-power fluctuation rate and the preset maximum allowable stability bandwidth of photovoltaic plant output power
It is small；
If the photovoltaic plant output-power fluctuation rate is less than the preset maximum allowable stability bandwidth of photovoltaic plant output power, setting
δ=0；
If the photovoltaic plant output-power fluctuation rate is greater than or equal to the preset maximum allowable wave of photovoltaic plant output power
Dynamic rate, setting
δ is stability bandwidth correction factor, PmaxFor the maximum allowable output power of preset photovoltaic plant.
5. control method according to claim 1, which is characterized in that the battery group at first moment according to acquisition
State-of-charge sets battery group state-of-charge correction factor, comprising:
According to preset multiple charge and discharge sections, determines and filled locating for the battery group state-of-charge at the first moment of the acquisition
Discharge range；
According to the charge and discharge section of the determination, battery group state-of-charge correction factor is set.
6. control method according to claim 5, which is characterized in that the charge and discharge section according to the determination, if
Determine battery group state-of-charge correction factor, comprising:
When the charge and discharge section of the determination is the first charge and discharge section, the photovoltaic plant output work at first moment is judged
Whether rate value is greater than the smoothed out photovoltaic electric station grid connection reference value, if so, setting ρ=0；If it is not, setting ρ=SOC (t)-
SOChigh；The multiple charge and discharge section is specially the first to the 5th charge and discharge section；
When the charge and discharge section of the determination is the second charge and discharge section, ρ=SOC (t)-SOC is sethigh；
When the charge and discharge section of the determination is third charge and discharge section, ρ=0 is set；
When the charge and discharge section of the determination is the 4th charge and discharge section, ρ=SOC (t)-SOC is setlow；
When the charge and discharge section of the determination is the 5th charge and discharge section, the photovoltaic plant output work at first moment is judged
Whether rate value is greater than the smoothed out photovoltaic electric station grid connection reference value；If so, setting ρ=SOC (t)-SOClow；If it is not, setting
ρ=0；
ρ is battery group state-of-charge correction factor, and SOC (t) is instantaneous value of the battery group state-of-charge at the first moment,
SOChighFor the lower limit value of the second charge and discharge section state-of-charge or the upper limit value of third charge and discharge section state-of-charge, SOClow
For the lower limit value of third charge and discharge section state-of-charge or the upper limit value of the 4th charge and discharge section state-of-charge.
7. control method according to claim 2, which is characterized in that described according to stability bandwidth correction factor and battery group
State-of-charge correction factor calculates the output power value at control the first moment of energy-storage system, comprising: calculate by following formula:
PbatcmdIt (t) is the output power value at the first moment of energy-storage system, Pbat_base(t)=Pgrid-Ppv；Pbat_baseIt (t) is energy storage
The base value of the output power at the first moment of system；Pocs_rateFor the rated capacity of energy accumulation current converter, δ is stability bandwidth correction factor, ρ
For battery group state-of-charge correction factor.
8. a kind of photovoltaic plant characterized by comprising photovoltaic system, energy-storage system, ac bus and controller；
The photovoltaic system and the energy-storage system are connect with the ac bus respectively；
The ac bus is connect by step-up transformer with power grid；
The ac bus outlet side is equipped with photovoltaic plant output power detection unit；
The photovoltaic system includes the photovoltaic power generation array and photovoltaic DC-to-AC converter of electrical connection；The energy-storage system includes electrical connection
Battery group, energy accumulation current converter and battery group state-of-charge detection unit；
The photovoltaic plant output power detection unit is used to detect the output power of the photovoltaic plant and is transferred to the control
Device processed；
The state-of-charge detection unit is for detecting the battery group state-of-charge and being transferred to the controller；
The controller includes processor and memory, and the processor is electrically connected with the memory；
The processor is used to call the program instruction in the memory, is required described in any one of 1 to 7 with perform claim
Stabilize the control method that photovoltaic plant goes out fluctuation.
9. photovoltaic plant according to claim 8, which is characterized in that the energy accumulation current converter is bidirectional converter；
When controlling energy-storage system charging, after the energy accumulation current converter is rectified the alternating current of the power grid, to institute
Battery group is stated to charge；
When controlling the energy storage system discharges, the DC inverter of the battery group is alternating current by the energy accumulation current converter
For power grid power supply.
10. a kind of non-transient computer readable storage medium, which is characterized in that the non-transient computer readable storage medium is deposited
Computer instruction is stored up, the computer instruction makes to stabilize photovoltaic plant described in any one of computer perform claim requirement 1 to 7
The control method of fluctuation out.
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| CN114336786A (en) * | 2021-11-24 | 2022-04-12 | 港华能源投资有限公司 | Output power regulation and control method, equipment and power generation system |
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| CN102593854A (en) * | 2012-02-01 | 2012-07-18 | 中国电力科学研究院 | Method for stabilizing wind power fluctuation under transient time constant of battery energy storage system |
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| CN102593854A (en) * | 2012-02-01 | 2012-07-18 | 中国电力科学研究院 | Method for stabilizing wind power fluctuation under transient time constant of battery energy storage system |
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