CN115224710A - Wind-solar power storage station and output control method thereof - Google Patents
Wind-solar power storage station and output control method thereof Download PDFInfo
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- CN115224710A CN115224710A CN202210938006.8A CN202210938006A CN115224710A CN 115224710 A CN115224710 A CN 115224710A CN 202210938006 A CN202210938006 A CN 202210938006A CN 115224710 A CN115224710 A CN 115224710A
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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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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
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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
Abstract
The application provides a wind and light power storage station and a power output control method thereof, wherein the method comprises the steps of firstly obtaining the power of each system and the SOC of an energy storage system, and determining the power upper limit reference value of the wind and light power storage station; then when the sum of the power of each system is greater than the power upper limit reference value, reducing the power of each system; when the sum of the power of each system is smaller than the upper power limit reference value, the power of each system is increased; and until the difference value between the sum of the system power and the power upper limit reference value is within a preset range, the wind-solar power storage station can reach the power upper limit reference value as much as possible, and the maximization of the power is realized. In addition, before the power of each system is adjusted, the working mode which the energy storage system is allowed to enter is determined according to the SOC, so that the overcharge and the overdischarge are avoided; and the energy storage system is taken as the first priority when the power is reduced, and the energy storage system is taken as the last priority when the power is increased, so that the energy storage system maintains a higher SOC as much as possible, and the SOC is ensured to be in a good state.
Description
Technical Field
The application relates to the technical field of new energy power generation, in particular to a wind and light power storage station and a power output control method thereof.
Background
The wind power generation and the photovoltaic power generation have complementarity, and are further provided with a power station for storing energy, so that the grid connection stability can be ensured; the wind, light and storage three devices adopt a low-voltage coupling mode, so that the defect of waste of generated energy can be overcome, and the transmission cost is saved. However, a corresponding control strategy is lacked at present, and the energy storage SOC (State of charge) can be ensured to operate in a good State while the wind-solar-energy-storage low-voltage coupling output is maximized.
Disclosure of Invention
In view of this, the application provides a wind-solar energy storage power station and an output control method thereof, so as to ensure that the SOC of stored energy is in a good state while maximizing the coupling output of wind-solar energy storage low voltage.
In order to achieve the above purpose, the present application provides the following technical solutions:
the application provides a method for controlling output of a wind and photovoltaic power storage station, wherein a wind power system, a photovoltaic system and an energy storage system are connected to the input side of a transformer in the wind and photovoltaic power storage station in parallel, and the method for controlling output comprises the following steps:
acquiring the power of each system and the state of charge (SOC) of the energy storage system, and determining the power upper limit reference value of the wind and light power storage station;
determining an allowable working mode of the energy storage system according to the SOC;
when the sum of the power of each system is larger than the upper power limit reference value, the energy storage system is taken as the priority head, and the power of each system is reduced; when the sum of the power of each system is smaller than the upper power limit reference value, the energy storage system is taken as the priority end, and the power of each system is increased;
until the difference between the sum of the powers of the systems and the power upper limit reference value is within a preset range.
Optionally, when the power of each system is reduced, the priority ranking of each system from top to bottom is as follows: the energy storage system, the photovoltaic system and the wind power system.
Optionally, taking the energy storage system as a priority head, reducing power of each system includes:
judging whether the sum of the powers of the systems is greater than or equal to the power upper limit reference value or not when the power of the energy storage system is the minimum output value in the current allowable working mode;
if so, controlling the energy storage system to exit the discharging mode or enter the charging mode;
otherwise, controlling the power of the energy storage system to be reduced to the minimum output value, and continuously reducing the power of the photovoltaic system and the power of the wind power system.
Optionally, controlling the energy storage system to exit the discharging mode or enter the charging mode includes:
determining a difference value obtained by subtracting the power of the photovoltaic system and the power of the wind power system from the power upper limit reference value as a charging value;
controlling the power of the energy storage system to decrease to the lesser of zero and the charge value.
Optionally, continuously reducing the power of the photovoltaic system and the power of the wind power system includes:
judging whether the power of the wind power system is larger than or equal to the difference obtained by subtracting the minimum output value from the power upper limit reference value;
if so, controlling the power of the photovoltaic system to be reduced to zero, and controlling the power of the wind power system to be reduced to the difference between the power upper limit reference value and the minimum output value;
otherwise, controlling the power of the photovoltaic system to be reduced to the power upper limit reference value minus the difference between the minimum output value and the power of the wind power system.
Optionally, when the power of each system is increased, the priority ranking of each system is from top to bottom: the wind power system, the photovoltaic system and the energy storage system.
Optionally, taking the energy storage system as a priority end bit, increasing power of each system, including:
the power of the wind power system and the photovoltaic system is improved;
judging whether the sum of the powers of all the systems is greater than or equal to the power upper limit reference value or not when the power of the energy storage system is the maximum output value in the current allowable working mode;
if so, controlling the power of the energy storage system to be increased to the power upper limit reference value minus the difference between the power of the photovoltaic system and the power of the wind power system;
otherwise, controlling the energy storage system to exit the charging mode or enter the discharging mode.
Optionally, the increasing the power of the wind power system and the photovoltaic system includes:
the difference between the power of the energy storage system and the power of the photovoltaic system is subtracted from the power upper limit reference value to serve as an upper limit, and the power of the wind power system is controlled to be increased;
judging whether the sum of the power of each system is still smaller than the power upper limit reference value;
if so, subtracting the difference between the power of the energy storage system and the power of the wind power system from the power upper limit reference value to serve as an upper limit, and controlling the power boost of the photovoltaic system.
Optionally, controlling the energy storage system to exit the charging mode or enter the discharging mode includes:
judging whether the difference between the power of the photovoltaic system and the power of the wind power system subtracted from the upper power limit reference value is greater than an under-actuated threshold value of the energy storage system or not;
if so, controlling the power of the energy storage system to be increased to the power upper limit reference value minus the difference between the power of the photovoltaic system, the power of the wind power system and the under-actuated threshold value;
otherwise, controlling the power of the energy storage system to be zero.
Optionally, determining the power upper limit reference value of the wind-solar energy storage power station includes:
acquiring an upper layer scheduling power instruction value;
and taking the smaller of the upper-layer scheduling power instruction value and the operation protection fixed value of the transformer as the power upper limit reference value.
Optionally, determining the operation mode allowed to be entered by the energy storage system according to the SOC includes:
when the SOC is less than or equal to a discharging threshold value, determining that the working mode allowed to be entered by the energy storage system is a charging mode;
when the SOC is greater than or equal to a charging threshold value, determining that the working mode allowed to be entered by the energy storage system is a discharging mode;
determining that the operating modes allowed to be entered by the energy storage system include a charging mode and a discharging mode when the SOC is between the discharging threshold and the charging threshold.
Optionally, when the working mode allowed by the energy storage system is a charging mode, the minimum output value is the corresponding power under the negative rated capacity, and the maximum output value is zero;
the working mode allowed to enter by the energy storage system is a discharging mode, the minimum output value is zero, and the maximum output value is corresponding power under rated capacity;
the working modes allowed to enter the energy storage system comprise a charging mode and a discharging mode, the minimum output value of the working modes is the corresponding power under the negative rated capacity, and the maximum output value of the working modes is the corresponding power under the rated capacity.
The second aspect of the present application further provides a wind-solar power storage station, including: the system comprises a controller, a transformer, a wind power system, a photovoltaic system and an energy storage system; wherein the content of the first and second substances,
each system is connected in parallel to the input side of the transformer;
the output side of the transformer is connected with a power grid through a booster station;
the controller is respectively in communication connection with the transformer and each system, and is configured to execute the output control method of the wind-photovoltaic power storage station according to any one of the first aspects.
According to the output control method of the wind and light power storage station, under the condition that the input side of a transformer in the wind and light power storage station is connected with a wind power system, a photovoltaic system and an energy storage system in parallel, the power of each system and the SOC of the energy storage system are obtained firstly, and the power upper limit reference value of the wind and light power storage station is determined; then when the sum of the power of each system is larger than the power upper limit reference value, reducing the power of each system; when the sum of the power of each system is smaller than the upper power limit reference value, the power of each system is increased; and until the difference between the sum of the power of each system and the power upper limit reference value is within a preset range, so that the wind and light power storage station can reach the power upper limit reference value as much as possible, and the maximization of the power is realized. In addition, the method determines the working mode allowed to enter by the energy storage system according to the SOC before adjusting the power of each system, so that the situation of overcharge and overdischarge of the energy storage system is avoided; and when the power of each system is reduced, the energy storage system is taken as the first priority, and when the power of each system is improved, the energy storage system is taken as the last priority, so that the energy storage system maintains a higher SOC as much as possible, and the SOC of the energy storage system is ensured to be in a good state.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a wind-solar power storage station according to an embodiment of the present application;
fig. 2 is a flowchart of an output control method of a wind-solar power storage station according to an embodiment of the present application;
fig. 3 and fig. 4 are respectively partial specific flowcharts of a method for controlling the output of the wind-solar energy storage power station according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a wind-solar power storage station provided in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a component of' 8230; \8230;" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.
The application provides a wind-solar energy storage power station output control method, which aims to ensure that the SOC of energy storage is in a good state while realizing maximization of wind-solar energy storage low-voltage coupling output.
Referring to fig. 1, a wind power system, a photovoltaic system and an energy storage system are connected in parallel to an input side of a transformer in the wind and light power storage station, and each system is respectively provided with a corresponding power supply and a converter thereof, for example, the wind power system is provided with at least one wind power generator and a wind power converter thereof, the photovoltaic system is provided with at least one photovoltaic string and an inverter thereof, and the energy storage system is provided with at least one battery cluster and a bidirectional inverter thereof; the structure and connection relationship of each system can be referred to in the prior art, and are not described in detail here.
The output control method of the wind-solar energy storage power station is executed by a controller of the wind-solar energy storage power station, and as shown in fig. 2, the method mainly comprises the following steps:
s101, power of each system and SOC of an energy storage system are obtained, and a power upper limit reference value of the wind and light energy storage power station is determined.
In practical application, the controller of the wind and light power storage station can acquire the SOC of the energy storage system and the power Pwi, pso and Pst of each system in real time, wherein Pwi is the real-time power of the wind power system, pso is the real-time power of the photovoltaic system, and Pst is the real-time power of the energy storage system. The process can be specifically that the controller directly obtains the current through respectively communicating with the current transformer in each system, or the controller collects the current of each system and the voltage of the input side of the transformer to respectively calculate; depending on the specific application environment, are all within the scope of the present application.
Meanwhile, the controller generally receives an upper layer power command such as AGC (Automatic Generation Control) and acquires an upper layer scheduling power command value Pagc. Then, the controller can directly use the upper-layer scheduling power instruction value Pagc as a reference value of the sum of the wind-solar energy storage power, namely the power upper limit reference value of the wind-solar energy storage power station; or, more preferably, after acquiring the upper scheduling power command value Pagc, the controller compares the upper scheduling power command value Pagc with an operation protection fixed value Str of a transformer which is set inside the controller, and then takes the smaller of the upper scheduling power command value Pagc and the operation protection fixed value Str as the power upper limit reference value, so as to ensure the safety of the system operation.
In addition, the setting parameters inside the controller may further include other parameters for subsequent steps, such as: a charging threshold Socu of the SOC, a discharging threshold Socl of the SOC, a discharging under-action threshold Pdissurea, rated capacities Swi, sso and Sst of each system; where Swi is the rated capacity of the wind power system, sso is the rated capacity of the photovoltaic system, and Sst is the rated capacity of the energy storage system.
And S102, determining an allowable working mode of the energy storage system according to the SOC.
In order to prevent the energy storage system from being overcharged and overdischarged, the operation mode which is allowed to be entered can be set in advance, such as:
when the SOC is less than or equal to Socl, determining that the working mode which the energy storage system is allowed to enter is a charging mode, namely only allowing the energy storage system to be charged, but not allowing the energy storage system to be discharged; because the current directions of the energy storage system during charging and discharging are different, the power of the energy storage system during discharging can be defined as a positive value, and the power of the energy storage system during charging is defined as a negative value; when only charging is allowed, the minimum output value of the energy storage system is corresponding power under negative rated capacity, the maximum output value is zero, namely the lower limit of the energy storage power Pstmin = -Sst and the upper limit Pstmax =0.
When the SOC is larger than or equal to the Socu charging threshold, determining that the working mode which the energy storage system is allowed to enter is a discharging mode, namely only allowing the energy storage system to discharge but not allowing the energy storage system to charge; at this time, the minimum output value of the energy storage system is zero, and the maximum output value is the corresponding power under the rated capacity, that is, the lower limit of the energy storage power Pstmin =0 and the upper limit Pstmax = Sst at this time.
Only when Socu < SOC < Socl, determining that the operating modes allowed to be entered by the energy storage system include a charging mode and a discharging mode, namely, allowing the energy storage system to be charged and discharged; at this time, the minimum output value of the energy storage system is the corresponding power under the negative rated capacity, and the maximum output value of the energy storage system is the corresponding power under the rated capacity, that is, the lower limit of the energy storage power Pstmin = -Sst and the upper limit Pstmax = Sst at this time.
After the working mode allowed to enter by the energy storage system is determined, the adjusting direction of the power station can be determined according to the relation between the overall power of the wind-solar energy storage power station and the power upper limit reference value; for example, when the sum of the power of the wind-solar energy storage is greater than the power upper limit reference value, the overall power needs to be reduced, otherwise, the overall power should be increased until the sum of the power of the wind-solar energy storage approaches the power upper limit reference value. Specifically, steps S103 and S104 shown below may be performed.
S103, when the sum of the power of each system is larger than the power upper limit reference value, the energy storage system is taken as the priority head, and the power of each system is reduced; until the difference value between the sum of the powers of the systems and the power upper limit reference value is within a preset range.
In practical application, in order to enable the SOC of the energy storage system to be in a good state, the discharge capacity of the energy storage system can be reduced as much as possible; therefore, when the overall power of the wind and light power storage station needs to be reduced, the power of each system can be reduced by taking the energy storage system as the first priority; that is, whenever it is desired to reduce the overall power, it is preferable to reduce the power of the energy storage system, for example, to reduce the discharge power of the energy storage system, or to increase the charge power of the energy storage system, depending on the operating mode it is allowed to enter.
Preferably, when the power of each system is reduced, the priority ranking of each system from top to bottom is as follows: energy storage system, photovoltaic system and wind power system. That is, when step S103 is executed, the power of each system may be sequentially reduced according to the priority sequence of the energy storage system, the photovoltaic system, and the wind power system from top to bottom. Specifically, when the overall power of wind-solar energy storage needs to be reduced, the controller preferentially closes the discharging power of the energy storage system or opens the charging power of the energy storage system; and secondly, reducing the power of the photovoltaic system, and finally reducing the power of the wind power system until the integral power of the wind-solar energy storage is smaller than the power upper limit reference value.
It should be noted that, by adopting the priority setting, the loss of power curtailment can be reduced as much as possible, and the transformer can be protected and the power can be prevented from being penalized by the power grid beyond limit because the regulation speed of the optical storage is faster. However, in practical applications, the priority order is not limited to the above priority order, and the power of the energy storage system may be reduced preferentially, and other power reduction orders are also within the protection scope of the present application.
S104, when the power sum of each system is smaller than the power upper limit reference value, taking the energy storage system as the last priority, and improving the power of each system; until the difference between the sum of the powers of the systems and the power upper limit reference value is within a preset range.
When the overall power of the wind and photovoltaic power storage station needs to be increased, the power of the photovoltaic system and the wind and photovoltaic system can be increased, and if the overall power of the wind and photovoltaic power storage station still cannot reach the upper power limit reference value, the power of the energy storage system is increased, for example, the charging power of the energy storage system is reduced, or the discharging power of the energy storage system is increased, which is determined according to the allowable working mode.
Preferably, when the power of each system is increased, the priority ranking of each system from top to bottom is as follows: wind power system, photovoltaic system and energy storage system. That is, when step S104 is executed, the power of each system may be sequentially reduced according to the priority ranking of the wind power system, the photovoltaic system, and the energy storage system from top to bottom. Specifically, when the overall power of wind, light and energy storage needs to be increased, the power of the wind power system is preferentially increased, the power of the photovoltaic system is increased, the charging power of the energy storage system is reduced finally, or the discharging mode of the energy storage is started until the sum of the power of the wind, light and energy storage approaches to a reference value.
It should be noted that the order of raising the power of each system is not limited to the priority ranking, and it is only required to maintain the SOC of the energy storage system in a good state as much as possible, for example, the charging threshold value Socu and the discharging threshold value Socl are between, depending on the specific application environment, and are within the protection scope of the present application.
According to the output control method provided by the embodiment, the wind-solar power storage station can reach the power upper limit reference value as much as possible through the principle, and the maximization of power is realized. In addition, the method determines the working mode allowed to enter by the energy storage system according to the SOC before adjusting the power of each system, so that the situation of overcharge and overdischarge of the energy storage system is avoided; in addition, the energy storage system is taken as the first priority when the power of each system is reduced, and the energy storage system is taken as the last priority when the power of each system is improved, so that the energy storage system maintains a higher SOC as much as possible, and the SOC of the energy storage system is ensured to be in a good state.
On the basis of the previous embodiment, the present embodiment gives some specific implementation form examples for the output control method of the wind-solar-energy storage power station, such as:
in step S103, the energy storage system is taken as the priority head, and the power of each system is reduced, where the process may specifically include the steps shown in fig. 3:
s201, judging whether the sum of the power of the energy storage systems is larger than or equal to the power upper limit reference value or not when the power of the energy storage systems is the minimum output value in the current allowable working mode.
No matter what the currently allowed working mode of the energy storage system is, the minimum output value is recorded as the energy storage power lower limit Pstmin in the various working modes in the above embodiment; taking the smaller min { Str, pagc } of the upper-layer scheduling power instruction value Pagc and the operation protection fixed value Str of the transformer as an example of the power upper limit reference value, at this time, step S201 specifically judges whether Pwi + Pso + Pstmin ≧ min { Str, pagc } is true; if yes, it indicates that the determination condition of step S201 is satisfied, and step S202 may be executed; otherwise, step S203 is executed.
And S202, controlling the energy storage system to exit a discharging mode or enter a charging mode.
The step S202 may specifically include:
(1) And determining a difference value obtained by subtracting the power of the photovoltaic system and the power of the wind power system from the power upper limit reference value as a charging value.
That is, the calculation formula of the charge value is min { Str, pagc } -Pwi-Pso.
(2) The power of the energy storage system is controlled to be reduced to the smaller of zero and the charging value.
In practical application, the controller can send a power regulation instruction to the energy storage system, so that the power of the energy storage system is regulated to min { min { Str, pagc } -Pwi-Pso,0}.
S203, controlling the power of the energy storage system to be reduced to a minimum output value, and continuously reducing the power of the photovoltaic system and the power of the wind power system.
Preferably, the power of the photovoltaic system and the wind power system is continuously reduced, which may specifically include that shown in fig. 3:
s301, judging whether the power of the wind power system is larger than or equal to the difference of the power upper limit reference value minus the minimum output value.
Reducing the power of the energy storage system to the minimum output value Pstmin, and judging whether Pwi is larger than or equal to min { Str, pagc } -Pstmin or not in step S301; if yes, go to step S302; otherwise, step S303 is executed.
And S302, controlling the power of the photovoltaic system to be reduced to zero, and controlling the power of the wind power system to be reduced to the difference of the power upper limit reference value minus the minimum output value.
In practical application, the controller can respectively send a power reduction instruction to the photovoltaic system and the wind power system, so that the power of the photovoltaic system is adjusted to 0, and the power of the wind power system is adjusted to min { Str, pagc } -Pstmin.
And S303, controlling the power of the photovoltaic system to be reduced to a difference obtained by subtracting the minimum output value from the power upper limit reference value and the power of the wind power system.
In practical application, the controller can send a power reduction instruction to the wind power system to adjust the power of the wind power system to min { Str, pagc } -Pstmin-Pwi.
In addition, in step S104 of the output control method, the energy storage system is used as a priority end bit to boost the power of each system, which may specifically include the following steps shown in fig. 4:
s401, power of the wind power system and power of the photovoltaic system are improved.
This step S401 may specifically include the steps shown in fig. 4:
and S501, subtracting the difference between the power of the energy storage system and the power of the photovoltaic system from the power upper limit reference value to serve as an upper limit, and controlling the power boost of the wind power system.
In practical application, the controller can send a power boosting command to the wind power system to adjust the power to min { Str, pagc } -Pso-Pst.
S502, judging whether the sum of the power of all the systems is still smaller than the power upper limit reference value.
That is, it is determined whether Pwi + Pso + Pst < min { Str, pagc } is true, and if true, step S503 is executed; otherwise, step S104 is directly completed.
And S503, subtracting the difference between the power of the energy storage system and the power of the wind power system from the power upper limit reference value to serve as an upper limit, and controlling the power of the photovoltaic system to be increased.
In practical applications, a power boost command can be sent from the controller to the photovoltaic, with an upper limit of min { Str, pagc } -Pwi-Pst.
After step S401 is completed, step S402 may be performed.
S402, judging whether the sum of the powers of the systems is larger than or equal to the upper power limit reference value or not when the power of the energy storage system is the maximum output value in the current allowable working mode.
Namely, whether Pwi + Pso + Pstmax ≧ min { Str, pagc } is established or not is judged; if yes, go to step S403; otherwise, step S404 is performed.
And S403, controlling the power of the energy storage system to be increased to a power upper limit reference value minus the difference between the power of the photovoltaic system and the power of the wind power system.
In practical application, a power regulation instruction can be sent to the energy storage by the controller, and the power is min { Str, pagc } -Pwi-Pso.
And S404, controlling the energy storage system to exit the charging mode or enter the discharging mode.
This step S404 specifically includes the steps shown in fig. 4:
s601, judging whether the difference between the power of the photovoltaic system and the power of the wind power system subtracted from the upper power limit reference value is larger than an under-actuated threshold value of the energy storage system or not.
Namely, whether Pwi + Pso < min { Str, pagc } -Pdissunea is established or not is judged; if yes, go to step S602; otherwise, step S603 is performed.
And S602, controlling the power of the energy storage system to be increased to a power upper limit reference value minus the difference between the power of the photovoltaic system, the power of the wind power system and the under-actuated threshold value.
In practical application, the controller can send a command for adjusting power to the energy storage, and the power is min { Str, pagc } -Pwi-Pso-Pdeisunea.
And S603, controlling the power of the energy storage system to be zero.
In this case, the controller may send a command to adjust the power to the energy storage device, and the power may be 0.
It should be noted that, this embodiment only provides an optional example of the power adjustment in steps S103 and S104, and the practical application is not limited thereto, and not only the power adjustment of the photovoltaic system and the wind power system can be performed in an interchangeable order or simultaneously, but also various parameters in the adjustment process can be set differently according to the practical situation, which is not specifically limited herein, and any scheme capable of achieving the maximization of the wind/photovoltaic power storage and the good SOC state is within the protection scope of the present application.
Another embodiment of the present application further provides a wind and photovoltaic power storage station, which as shown in fig. 1, specifically includes: the system comprises a controller 50, a transformer 40, a wind power system 10, a photovoltaic system 20 and an energy storage system 30; wherein:
each system is connected in parallel to the input side of the transformer 40; the output side of the transformer 40 is connected to the grid via a booster station.
The transformer 30 may in particular be a box transformer, such as the box transformer shown in the figure.
In practical application, each system is provided with a corresponding power supply and a converter thereof, and the power supply specifically refers to a wind turbine generator in the wind turbine generator system 10, a photovoltaic group string in the photovoltaic system 20 or a battery cluster in the energy storage system 30; the photovoltaic group string comprises one or at least two photovoltaic components connected in series, and the battery cluster comprises one or at least two battery modules connected in series.
For example, referring to fig. 5, the wind power system 10 is provided with at least one wind turbine generator 101 and a wind power converter 102 thereof, an input side of each wind power converter 102 is connected to the corresponding wind turbine generator 101, and an output side of each wind power converter 102 is connected to an input side of the transformer 40. The photovoltaic system 20 is provided with at least one photovoltaic string 201 and inverters 202 thereof, the dc side of each inverter 202 is connected to the corresponding photovoltaic string 201, and the ac side of each inverter 202 is connected to the input side of the transformer 40. The energy storage system 30 is provided with at least one battery cluster 301 and bidirectional inverters 302 thereof, the dc side of each bidirectional inverter 302 is connected to a corresponding battery cluster in the battery system, and the ac side of each bidirectional inverter 302 is connected to the input side of the transformer 40. The specific structure and connection relationship of the converters in each system can be referred to in the prior art, and are not described in detail here.
The controller 50 is respectively connected with the transformer 40 and each system in a communication way, and is used for executing the output control method of the wind-solar power storage station according to any one of the above embodiments. The process and principle of the output control method can be referred to the above embodiments, and are not described in detail herein.
The wind-solar energy storage power station can make up the defect of waste of generated energy and reduce the power transmission cost through a wind-solar energy storage low-voltage coupling structure. Moreover, the controller 50 adjusts the wind-solar energy storage output in real time by collecting the wind-solar energy storage real-time power state, the SOC of the energy storage system 30 and the power instruction of upper layer scheduling, so as to maximize the wind-solar energy storage output, ensure that the SOC of the energy storage system is in a good state, and reduce the overcharge and overdischarge of the energy storage system 30.
The same and similar parts among the various embodiments in this specification can be referred to each other, and each embodiment focuses on differences from other embodiments. In particular, the system or system embodiments, which are substantially similar to the method embodiments, are described in a relatively simple manner, and reference may be made to some descriptions of the method embodiments for relevant points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement without inventive effort.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components and steps of the various examples have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the above description of the disclosed embodiments, features described in various embodiments in this specification can be substituted for or combined with each other to enable those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (13)
1. The output control method of the wind and light power storage station is characterized in that the input side of a transformer in the wind and light power storage station is connected with a wind power system, a photovoltaic system and an energy storage system in parallel, and the output control method comprises the following steps:
acquiring the power of each system and the state of charge (SOC) of the energy storage system, and determining the power upper limit reference value of the wind and light power storage station;
determining an allowable working mode of the energy storage system according to the SOC;
when the sum of the power of each system is larger than the upper power limit reference value, the energy storage system is taken as the priority head, and the power of each system is reduced; when the sum of the power of each system is smaller than the upper power limit reference value, taking the energy storage system as the last priority, and improving the power of each system;
until the difference value between the sum of the powers of the systems and the power upper limit reference value is within a preset range.
2. The output control method of the wind-solar energy storage power station of claim 1, wherein when the power of each system is reduced, the priority sequence of each system is from top to bottom: the energy storage system, the photovoltaic system and the wind power system.
3. The output control method of the wind-solar energy storage power station of claim 1, wherein the energy storage system is taken as a priority head, and the power of each system is reduced, and the method comprises the following steps:
judging whether the sum of the powers of the systems is greater than or equal to the power upper limit reference value or not when the power of the energy storage system is the minimum output value in the current allowable working mode;
if so, controlling the energy storage system to exit a discharging mode or enter a charging mode;
otherwise, controlling the power of the energy storage system to be reduced to the minimum output value, and continuously reducing the power of the photovoltaic system and the power of the wind power system.
4. The output control method of the wind-solar energy storage power station of claim 3, wherein controlling the energy storage system to exit the discharge mode or enter the charge mode comprises:
determining a difference value obtained by subtracting the power of the photovoltaic system and the power of the wind power system from the power upper limit reference value as a charging value;
controlling the power of the energy storage system to decrease to the lesser of zero and the charge value.
5. The output control method of the wind-solar power storage station according to claim 3, wherein the step of continuously reducing the power of the photovoltaic system and the wind power system comprises:
judging whether the power of the wind power system is larger than or equal to the difference of the power upper limit reference value minus the minimum output value;
if so, controlling the power of the photovoltaic system to be reduced to zero, and controlling the power of the wind power system to be reduced to the difference between the power upper limit reference value and the minimum output value;
otherwise, controlling the power of the photovoltaic system to be reduced to the power upper limit reference value minus the difference between the minimum output value and the power of the wind power system.
6. The output control method of the wind-solar power storage station according to claim 1, wherein when the power of each system is increased, the priority sequence of each system is as follows from top to bottom: the wind power system, the photovoltaic system and the energy storage system.
7. The output control method of the wind and light power storage station according to claim 1, wherein the energy storage system is used as a priority end position to increase the power of each system, and the method comprises the following steps:
boosting the power of the wind power system and the photovoltaic system;
judging whether the sum of the powers of the systems is greater than or equal to the power upper limit reference value or not when the power of the energy storage system is the maximum output value in the current allowable working mode;
if so, controlling the power of the energy storage system to be increased to the power upper limit reference value minus the difference between the power of the photovoltaic system and the power of the wind power system;
otherwise, controlling the energy storage system to exit the charging mode or enter the discharging mode.
8. The output control method of the wind-solar power storage station according to claim 7, wherein the step of boosting the power of the wind power system and the photovoltaic system comprises:
the difference between the power of the energy storage system and the power of the photovoltaic system is subtracted from the power upper limit reference value to serve as an upper limit, and the power of the wind power system is controlled to be increased;
judging whether the sum of the powers of all the systems is still smaller than the power upper limit reference value;
if so, subtracting the difference between the power of the energy storage system and the power of the wind power system from the power upper limit reference value to serve as an upper limit, and controlling the power boost of the photovoltaic system.
9. The output control method of the wind and light energy storage plant of claim 7, wherein controlling the energy storage system to exit a charging mode or enter a discharging mode comprises:
judging whether the difference between the power of the photovoltaic system and the power of the wind power system subtracted from the upper power limit reference value is greater than an under-actuated threshold value of the energy storage system or not;
if so, controlling the power of the energy storage system to be increased to the power upper limit reference value minus the difference between the power of the photovoltaic system, the power of the wind power system and the under-actuated threshold value;
otherwise, controlling the power of the energy storage system to be zero.
10. The method for controlling the output of the wind-solar-energy storage power station of any one of claims 1 to 9, wherein determining the upper power limit reference value of the wind-solar-energy storage power station comprises:
acquiring an upper layer scheduling power instruction value;
and taking the smaller of the upper-layer scheduling power instruction value and the operation protection fixed value of the transformer as the power upper limit reference value.
11. The output control method of the wind-solar-energy storage power station of any one of claims 1 to 9, wherein determining the operation mode allowed to be entered by the energy storage system according to the SOC comprises:
when the SOC is less than or equal to a discharging threshold value, determining that the working mode allowed to be entered by the energy storage system is a charging mode;
when the SOC is greater than or equal to a charging threshold value, determining that the working mode allowed to be entered by the energy storage system is a discharging mode;
determining that the operating modes allowed to be entered by the energy storage system include a charging mode and a discharging mode when the SOC is between the discharging threshold and the charging threshold.
12. The output control method of the wind, light and energy storage power station of claim 11, wherein when the working mode allowed by the energy storage system is the charging mode, the minimum output value is the corresponding power under the negative rated capacity, and the maximum output value is zero;
the working mode allowed to enter by the energy storage system is a discharging mode, the minimum output value is zero, and the maximum output value is corresponding power under rated capacity;
the working modes allowed to enter the energy storage system comprise a charging mode and a discharging mode, the minimum output value of the working modes is the corresponding power under the negative rated capacity, and the maximum output value of the working modes is the corresponding power under the rated capacity.
13. A wind and light storage power station, comprising: the system comprises a controller, a transformer, a wind power system, a photovoltaic system and an energy storage system; wherein the content of the first and second substances,
each system is connected in parallel to the input side of the transformer;
the output side of the transformer is connected with a power grid through a booster station;
the controller is respectively connected with the transformer and each system in a communication mode and is used for executing the output control method of the wind-solar energy storage power station according to any one of claims 1 to 12.
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