CN114188963A - Wind storage system and energy storage SOC (System on chip) homing method thereof - Google Patents
Wind storage system and energy storage SOC (System on chip) homing method thereof Download PDFInfo
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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
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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
- H02J3/381—Dispersed generators
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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
- 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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The application provides a wind storage system and an energy storage SOC homing method thereof. In the energy storage SOC homing method of the wind energy storage system, when the SOC of the energy storage system at the current moment is not in a first preset primary frequency modulation range, the SOC of the energy storage system is adjusted by taking the first preset primary frequency modulation range as a target, so that the SOC of the energy storage system gradually meets the SOC requirement of primary frequency modulation on the energy storage system, namely: the available capacity of the energy storage system can gradually meet the charging requirement and/or the discharging requirement of the energy storage system in the primary frequency modulation process; in addition, the process is carried out in the idle period of the primary frequency modulation, so that the available capacity of the energy storage system can gradually meet the charging requirement and/or the discharging requirement of the energy storage system in the primary frequency modulation process before the next primary frequency modulation is started, and the risk of insufficient available capacity of the energy storage system in the next frequency modulation process can be reduced by the energy storage SOC homing method of the wind energy storage system provided by the application.
Description
Technical Field
The invention relates to the technical field of power engineering, in particular to a wind storage system and an energy storage SOC (system on chip) homing method thereof.
Background
Wind power, which is a main constituent part of new energy, is to convert kinetic energy of wind into mechanical energy of a fan, convert the mechanical energy into electric energy through a wind power converter, and finally feed the electric energy into a power grid to supply power to a load.
At present, in view of the problem of unstable output of wind power, the national level requires: an energy storage system is configured for the wind power device according to a certain proportion, so that the wind power device participates in responses such as primary frequency modulation and inertia response, namely: the energy storage system participates in the charging or discharging process; however, the capacity of the energy storage system is limited and after continuous charging or discharging, there is often also a risk of insufficient available capacity.
Therefore, how to reduce the risk of insufficient available capacity of the energy storage system in the next primary frequency modulation process is a technical problem to be solved urgently.
Disclosure of Invention
In view of this, the present invention provides a wind energy storage system and an energy storage SOC homing method thereof, so as to reduce the risk of insufficient available capacity of the energy storage system in the next frequency modulation process.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
one aspect of the present application provides an energy storage SOC homing method for a wind energy storage system, including:
judging whether the wind storage system is in a primary frequency modulation idle period or not;
if the wind storage system is in the primary frequency modulation idle period, judging whether the SOC of an energy storage system in the wind storage system at the current moment is in a first preset primary frequency modulation range;
and if the SOC of the energy storage system at the current moment is not in the first preset primary frequency modulation range, adjusting the SOC of the energy storage system by taking the first preset primary frequency modulation range as a target.
Optionally, if the SOC of the energy storage system at the current time is in the first preset primary frequency modulation range, determining whether the SOC of the energy storage system at the current time is in a second preset primary frequency modulation range;
and if the SOC of the energy storage system at the current moment is in the second preset primary frequency modulation range, the SOC of the energy storage system is not adjusted.
Optionally, if the SOC of the energy storage system at the current time is not within the second preset primary frequency modulation range, determining whether the fluctuation rate of the output power of the wind energy storage system is greater than a preset threshold;
and if the fluctuation rate is larger than the preset threshold, adjusting the SOC of the energy storage system by taking the second preset primary frequency modulation range as a target according to the SOC of the energy storage system at the current moment.
Optionally, the adjusting the SOC of the energy storage system with the second preset primary frequency modulation range as a target according to the SOC of the energy storage system at the current time includes:
determining smooth power according to the fan power at the current moment and the wind storage combined power at the previous moment in the wind storage system;
judging whether the SOC of the energy storage system at the current moment is smaller than the second preset primary frequency modulation range or not;
if the SOC of the energy storage system at the current moment is smaller than the second preset primary frequency modulation range, charging the SOC of the energy storage system when the smooth power is larger than zero, and discharging the SOC of the energy storage system when the smooth power is smaller than zero;
and if the SOC of the energy storage system at the current moment is larger than the second preset primary frequency modulation range, charging the SOC of the energy storage system when the smooth power is larger than zero, and discharging the SOC of the energy storage system when the smooth power is smaller than zero.
Optionally, when the SOC of the energy storage system at the current time is smaller than the second preset primary frequency modulation range, the charging power of the energy storage system is equal to the smoothing power, and the discharging power of the energy storage system is equal to the product of the first preset proportion and the smoothing power;
when the SOC of the energy storage system at the current moment is smaller than the second preset primary frequency modulation range, the charging power of the energy storage system is equal to the product of the first preset proportion and the smooth power, and the discharging power of the energy storage system is equal to the smooth power;
the first preset proportion is greater than zero and less than 1.
Optionally, determining the smooth power according to the wind turbine power at the current moment and the wind storage combined power at the previous moment in the wind storage system, including:
and determining the sum of the fan power at the current moment and the wind storage combined power at the previous moment in the wind storage system as the smooth power according to a second preset proportion.
Optionally, the ratio of the fluctuation amount of the output power of the wind storage system to the rated fan power in the wind storage system is used as the fluctuation rate;
the fluctuation quantity of the output power of the wind storage system is equal to the difference between the fan power at the current moment in the wind storage system and the wind storage combined power at the previous moment in the wind storage system.
Optionally, if the fluctuation rate is less than or equal to the preset threshold, the SOC of the energy storage system is not adjusted.
Optionally, before determining whether the SOC of the energy storage system in the wind energy storage system at the current time is in a first preset primary frequency modulation range, the method further includes:
judging whether the frequency of the grid-connected point of the wind storage system is in a dead zone state;
and if the frequency of the grid-connected point of the wind storage system is in the dead zone state, executing a step of judging whether the SOC of the energy storage system in the wind storage system at the current moment is in a first preset primary frequency modulation range.
Optionally, after waiting for a preset time, executing a step of judging whether the frequency of the grid-connected point of the wind storage system is in a dead zone state.
Optionally, the adjusting the SOC of the energy storage system with the first preset primary frequency modulation range as a target includes:
judging whether the SOC of the energy storage system at the current moment is smaller than the first preset primary frequency modulation range or not;
if the SOC of the energy storage system at the current moment is smaller than the first preset primary frequency modulation range, charging the energy storage system, wherein the charging power is equal to first preset power;
and if the SOC of the energy storage system at the current moment is larger than the first preset primary frequency modulation range, discharging the energy storage system, wherein the discharging power is equal to second preset power.
Optionally, the first preset power is a smaller value of a maximum limited fan power of the wind storage system and a maximum charging power of the energy storage system;
the second preset power is the smaller value of the difference between the maximum wind storage combined power of the wind storage system and the power of the fan at the current moment and the maximum discharge power of the energy storage system.
Optionally, the step of judging whether the wind storage system is in a primary frequency modulation idle period is performed periodically or continuously.
Another aspect of the present application provides a wind storage system, comprising: the wind power generation system comprises a wind power converter, a direct current conversion module, an energy storage system, a controller and at least one fan; wherein:
each fan is connected with a power grid and/or a load through the wind power converter;
the energy storage system is connected to a direct current bus of the wind power converter through the direct current conversion module;
the controller is in communication connection with the wind power converter and the energy storage system respectively, and the controller is used for executing the energy storage SOC homing method of the wind energy storage system according to any one of the previous aspects of the application.
Optionally, the controller is a system controller independent of the wind power converter, or the controller is an internal controller integrated in the wind power converter.
According to the technical scheme, the invention provides an energy storage SOC homing method of a wind storage system. Wherein, when SOC under energy storage system current moment is not in first default primary frequency modulation scope, use first default primary frequency modulation scope as the target, adjust energy storage system's SOC, can be so that energy storage system's SOC satisfies primary frequency modulation to energy storage system's SOC requirement gradually, promptly: the available capacity of the energy storage system can gradually meet the charging requirement and/or the discharging requirement of the energy storage system in the primary frequency modulation process; in addition, the process is carried out in the idle period of the primary frequency modulation, so that the available capacity of the energy storage system can gradually meet the charging requirement and/or the discharging requirement of the energy storage system in the primary frequency modulation process before the next primary frequency modulation is started, and the risk of insufficient available capacity of the energy storage system in the next frequency modulation process can be reduced by the energy storage SOC homing method of the wind energy storage system provided by the application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described 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 to fig. 3 are schematic diagrams of three flowcharts of an energy storage SOC homing method of a wind storage system according to an embodiment of the present disclosure;
fig. 4 is a schematic flow chart of the energy storage system at the present time after the SOC is in the first preset primary frequency modulation range;
fig. 5 is a detailed flowchart of step S160;
fig. 6 is a schematic structural diagram of a wind storage system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In this application, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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 phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In order to reduce the risk of insufficient available capacity of the energy storage system in the next primary frequency modulation process, an embodiment of the application provides an energy storage SOC homing method for a wind energy storage system, a specific flow of which is shown in fig. 1, and the method specifically includes the following steps:
and S110, judging whether the wind storage system is in a primary frequency modulation idle period.
If the wind storage system is in the primary frequency modulation idle period, executing step S120; and if the wind storage system is not in the primary frequency modulation idle period, stopping executing the energy storage SOC homing method of the wind storage system.
Wherein, primary frequency modulation idle period refers to: the time period from the end of the primary frequency modulation to the beginning of the next primary frequency modulation; during the period, although the adjustment of the SOC of the energy storage system may affect the frequency of the grid-connected point of the wind energy storage system, since the primary frequency modulation is still performed after the adjustment, the effect on the frequency of the grid-connected point of the wind energy storage system may be negligible during the primary frequency modulation idle period.
And S120, judging whether the SOC of the energy storage system in the wind storage system at the current moment is in a first preset primary frequency modulation range.
If the SOC of the energy storage system at the current time is not within the first preset primary frequency modulation range, step S130 is executed.
And S130, adjusting the SOC of the energy storage system by taking the first preset primary frequency modulation range as a target.
Wherein, first preset primary frequency modulation scope is for being fit for the SOC scope that energy storage system carries out primary frequency modulation, promptly: if the SOC of the energy storage system at the current moment is in a first preset primary frequency modulation range, the energy storage system can meet the SOC requirement of primary frequency modulation on the energy storage system, namely: the available capacity of the energy storage system can meet the discharge requirement and/or the charge requirement of the energy storage system in the primary frequency modulation process.
It should be noted that the first preset primary frequency modulation range is set by combining the specific condition and the working experience of the wind storage system during actual primary frequency modulation, and the specific value is not limited herein; for example, the first predetermined primary frequency modulation range may be set to 20% to 80%.
By the above, when the SOC of the energy storage system at the current moment is not in the first preset primary frequency modulation range, the SOC of the energy storage system is adjusted by taking the first preset primary frequency modulation range as a target, so that the SOC of the energy storage system gradually meets the SOC requirement of the primary frequency modulation on the energy storage system, namely: the available capacity of the energy storage system can gradually meet the charging requirement and/or the discharging requirement of the energy storage system in the primary frequency modulation process; in addition, the process is carried out in the idle period of the primary frequency modulation, so that the available capacity of the energy storage system can gradually meet the charging requirement and/or the discharging requirement of the energy storage system in the primary frequency modulation process before the next primary frequency modulation is started, and the risk of insufficient available capacity of the energy storage system in the next frequency modulation process can be reduced by the energy storage SOC homing method of the wind energy storage system provided by the application.
In another embodiment of the present application, step S120 is periodically executed, or step S120 is continuously executed, which is not specifically limited herein, and is within the protection scope of the present application as the case may be; it should be noted that, the SOC of the energy storage system can be adjusted in real time by continuously executing step S120, however, the power consumption is relatively large, and in practical application, step S120 may be executed periodically at a suitable frequency according to practical situations, that is: the power consumption is properly reduced while the SOC adjustment of the energy storage system is ensured.
Another embodiment of the present application provides a specific implementation manner of step S130, and a specific flow is shown in fig. 2, including the following steps:
s210, judging whether the SOC of the energy storage system at the current moment is smaller than a first preset primary frequency modulation range.
If the SOC of the energy storage system at the current moment is smaller than the first preset primary frequency modulation range, executing step S220; if the SOC of the energy storage system at the current time is greater than the first preset primary frequency modulation range, step S230 is executed.
And S220, charging the energy storage system, wherein the charging power is equal to a first preset power.
And S230, discharging the energy storage system, wherein the discharging power is equal to a second preset power.
It should be noted that, in this embodiment, when the SOC of the energy storage system is smaller than the first preset primary frequency modulation range, or is larger than the first preset primary frequency modulation range, only the energy storage system is charged or discharged, so that it is ensured that the SOC of the energy storage system does not deviate as much as possible, and a frequency modulation space is ensured.
In another embodiment of the present application, the first preset power is a smaller value of a maximum limit fan power of the wind storage system and a maximum charging power of the energy storage system; the second preset power is the smaller value of the difference between the maximum wind storage combined power of the wind storage system and the fan power at the current moment and the maximum discharge power of the energy storage system.
The maximum limit fan power of the wind storage system is the maximum fan power of the set wind storage system, and can be set according to the actual running condition, and the value of the maximum limit fan power is always smaller than the rated power; the maximum wind storage combined power of the wind storage system is the maximum output power which can be borne by the wind storage system at the grid-connected point.
Therefore, in this embodiment, the first preset power and the second preset power are both selected to be smaller values from the maximum power values that can be borne by the electric energy output side and the electric energy input side, that is, the embodiment can charge or discharge the maximum power of the SOC of the energy storage system on the premise of ensuring the electric power safety of the wind storage system, so that the SOC of the energy storage system is recovered to the first preset primary frequency modulation range as far as possible in the primary frequency modulation idle period, that is: the energy storage system can better participate in the next primary frequency modulation, and the risk of insufficient available capacity of the energy storage system is further reduced.
In practical applications, including but not limited to the above-mentioned embodiments, the above-mentioned embodiment is not specifically limited herein, and may be within the scope of the present application.
In another embodiment of the present application, as shown in fig. 3, before step S120, the method for homing the energy storage SOC of the wind storage system further includes the following steps:
s310, judging whether the frequency of the grid-connected point of the wind storage system is in a dead zone state.
If the frequency of the grid-connected point of the wind storage system is in the dead zone state, executing step S120; and if the frequency of the grid-connected point of the wind storage system is not in the dead zone state, stopping executing the energy storage SOC homing method of the wind storage system.
The dead zone state is an insensitive zone of the frequency of the grid-connected point of the wind storage system to the change of the electrical load near the rated frequency, namely: at the moment, the SOC of the energy storage system is adjusted, so that the frequency of a grid-connected point of the wind energy storage system is not influenced.
Therefore, the energy storage SOC homing method for the wind energy storage system provided by the embodiment can reduce the influence on the grid frequency when the SOC of the energy storage system is adjusted.
Preferably, a preset time is waited before step S120 is executed to reduce the number of times of adjustment of the energy storage system.
Another embodiment of the present application provides another implementation manner of the energy storage SOC homing method for the wind storage system, where a specific flow is shown in fig. 4, and if the SOC of the energy storage system at the current time is in the first preset primary frequency modulation range, the energy storage SOC homing method for the wind storage system further includes the following steps:
and S140, judging whether the SOC of the energy storage system at the current moment is in a second preset primary frequency modulation range.
If the SOC of the energy storage system at the current moment is not within the second preset primary frequency modulation range, executing step S150; if the SOC of the energy storage system at the current time is within the second preset primary frequency modulation range, step S170 is executed.
The second preset primary frequency modulation range is also an SOC range suitable for primary frequency modulation of the energy storage system; the second preset primary frequency modulation range is smaller than the first preset primary frequency modulation range; for example, the second preset primary frequency modulation range is 40% to 60%.
S150, judging whether the fluctuation rate of the output power of the wind storage system is larger than a preset threshold value or not.
If the fluctuation rate is greater than the preset threshold, executing step S160; if the fluctuation rate is less than or equal to the preset threshold, step S170 is executed.
The fluctuation rate is used for representing the fluctuation degree of the output power of the wind storage system; the preset threshold value is set according to the actual situation and experience of the wind storage system; when the fluctuation rate is larger than a preset threshold value, the fluctuation degree of the output power of the wind storage system is larger; and when the fluctuation rate is smaller than the preset threshold value, the fluctuation degree of the output power of the wind storage system is smaller.
In another embodiment of the application, the ratio of the fluctuation amount of the output power of the wind storage system to the rated fan power in the wind storage system is used as the fluctuation rate; the fluctuation quantity of the output power of the wind storage system is equal to the difference between the fan power at the current moment in the wind storage system and the wind storage combined power at the previous moment in the wind storage system.
If formulated, the following is shown:
Vol＝ΔP/Q＝(P_wind(k)-Pout(k-1))/Q
wherein, Δ P is the fluctuation of the output power of the wind storage system, Vol is the fluctuation rate of the output power of the wind storage system, P _ wind (k) is the fan power of the wind storage system at the current moment, Pout (k-1) is the wind storage combined power of the wind storage system at the last moment, and Q is the rated fan power of the wind storage system.
And S160, adjusting the SOC of the energy storage system by taking a second preset primary frequency modulation range as a target according to the SOC of the energy storage system at the current moment.
And S170, not adjusting the SOC of the energy storage system.
Therefore, the second preset primary frequency modulation range is smaller than the first preset primary frequency modulation range, so that the energy storage SOC homing method of the wind energy storage system provided by the embodiment can further perform SOC adjustment on the energy storage system meeting the above conditions, so that the available capacity of the energy storage system can gradually meet the further charging requirement and/or discharging requirement on the energy storage system in the primary frequency modulation process, and the adjustment effect of the energy storage system in the primary frequency modulation is further enhanced.
In another embodiment of the present application, as shown in fig. 5, step S160 specifically includes the following steps:
s410, determining smooth power according to the fan power at the current moment and the wind storage combined power at the previous moment in the wind storage system.
Specifically, the sum of the fan power at the current moment and the wind storage combined power at the previous moment in the wind storage system is determined as smooth power according to a second preset proportion; if formulated, the following is shown:
Pess＝(α-1)×(P_wind(k)+Pout(k-1))
wherein Pess is smooth power, and P _ wind (k) is the fan power of the wind storage system at the current moment; pout (k-1) is wind storage combined power at the last moment in the wind storage system; alpha is a preset coefficient, the preset coefficient is larger than zero and smaller than 1, the specific value of the preset coefficient is not limited, and the preset coefficient can be set according to experience and actual conditions and is within the protection scope of the application.
It should be noted that the above formula is only one specific embodiment for determining the smoothing power, and in practical applications, including but not limited to the above embodiment, the above embodiment is not specifically limited herein, and may be within the scope of the present application as the case may be.
And S420, judging whether the SOC of the energy storage system at the current moment is smaller than a second preset primary frequency modulation range.
If the SOC of the energy storage system at the current moment is smaller than the second preset primary frequency modulation range, executing step S430; if the SOC of the energy storage system at the current time is greater than the second preset primary frequency modulation range, step S440 is executed.
And S430, when the smooth power is larger than zero, charging the SOC of the energy storage system, and when the smooth power is smaller than zero, discharging the SOC of the energy storage system.
And S440, when the smooth power is larger than zero, charging the SOC of the energy storage system, and when the smooth power is smaller than zero, discharging the SOC of the energy storage system.
As can be seen from the above, in the process of adjusting the SOC of the energy storage system in step 160, the charging or discharging of the energy storage system at the current time is determined by the positive or negative of the smooth power, and the smooth power is determined according to the fan power of the wind storage system at the current time and the wind storage combined power of the previous time, so that the charging or discharging of the energy storage system at the current time is related to the fan power of the current time and the wind storage combined power of the previous time, and in addition, the fan power of the current time and the wind storage combined power of the previous time are also related to the fluctuation rate of the wind storage system, so that the charging or discharging of the energy storage system at the current time is related to the fluctuation rate of the wind storage system, and further the energy storage SOC homing method of the wind storage system provided in this embodiment can balance the fluctuation of the output power of the wind storage system to a certain extent through the SOC adjustment of the energy storage system, namely, the output power of the wind storage system is smoother, and the impact on the power grid is reduced.
In another embodiment of the present application, in step S430, the charging power of the energy storage system is equal to the smoothing power, and the discharging power of the energy storage system is equal to a product of the first preset ratio and the smoothing power.
In step S440, the charging power of the energy storage system is equal to the product of the first preset ratio and the smoothing power, and the discharging power of the energy storage system is equal to the smoothing power.
The first preset proportion is larger than zero and smaller than 1, specific values of the first preset proportion are not limited, and the first preset proportion can be set according to experience and actual conditions and is within the protection range of the application.
Since the first preset ratio is greater than zero and less than 1, the charging frequency is greater than the discharging frequency in step S430, and the charging frequency is less than the discharging frequency in step S440; therefore, in the process of adjusting the SOC of the energy storage system in step 160, overall, if the SOC of the energy storage system at the current time is smaller than the second preset primary frequency modulation range, the energy storage system is charged, and if the SOC of the energy storage system at the current time is larger than the second preset primary frequency modulation range, the energy storage system is discharged.
Taking a single-machine 5MW wind turbine generator as an example, the wind turbine generator is provided with a 1MWh energy storage system, and in the normal operation process, the energy storage system can frequently receive a frequency modulation instruction, for example, perhaps 10 times a day; when a primary frequency modulation instruction is received, the energy storage system participates in primary frequency modulation; and after the primary frequency modulation command is correspondingly finished, waiting for a period of time, and judging whether the frequency of the grid-connected point of the wind storage system is in a dead zone state.
If the system is in the dead zone state, when the SOC of the energy storage system is more than 40% and less than 60%, the energy storage system does not act; when the SOC of the energy storage system is less than 20%, only the energy storage system is charged, and when the SOC of the energy storage system is more than 80%, only the energy storage system is discharged, so that the SOC of the energy storage system approaches to the range of 20% -80% which is suitable for primary frequency modulation as soon as possible.
When the SOC of the energy storage system is more than 20% and less than 40%, the energy storage system is charged and discharged, but the charging power is more than the discharging power; when the SOC of the energy storage system is more than 60% and less than 80%, the energy storage system is charged and discharged, but the discharging power is more than the charging power; therefore, the SOC of the energy storage system is slowly close to 40% -60%, and meanwhile, the fluctuation of the output power of the wind storage system is balanced through the adjustment of the SOC of the energy storage system, so that the impact on a power grid is reduced.
Another embodiment of the present application provides a wind storage system, a specific structure of which is shown in fig. 6, and specifically includes: the wind power generation system comprises a wind power converter 01, a direct current conversion module 02, an energy storage system 03, a controller 04 and at least one fan 05.
In the wind storage system, each fan 05 is connected with a power grid/load 06 through a wind power converter 01; the energy storage system 03 is connected to a direct current bus of the wind power converter 01 through the direct current conversion module 02 (in fig. 6, the direct current bus in the wind power converter 01 is not shown, and only the wind power converter 01 is shown to be connected with the direct current conversion module 02); the controller 04 is in communication connection with the wind power converter 01 and the energy storage system 03 respectively, and the controller 04 is used for executing the energy storage SOC homing method of the wind storage system as claimed in any one of claims 1 to 13.
In another embodiment of the present application, the controller 04 is a system controller independent from the wind power converter 01, or the controller 04 is an internal controller integrated in the wind power converter 01.
The above two setting modes of the controller 04 are only described, and in practical applications, including but not limited to the above two embodiments, the two setting modes are not specifically limited herein, and may be within the protection scope of the present application as the case may be.
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 application. The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (15)
1. An energy storage SOC homing method of a wind energy storage system is characterized by comprising the following steps:
judging whether the wind storage system is in a primary frequency modulation idle period or not;
if the wind storage system is in the primary frequency modulation idle period, judging whether the SOC of an energy storage system in the wind storage system at the current moment is in a first preset primary frequency modulation range;
and if the SOC of the energy storage system at the current moment is not in the first preset primary frequency modulation range, adjusting the SOC of the energy storage system by taking the first preset primary frequency modulation range as a target.
2. The method for returning the energy storage SOC of the wind energy storage system according to claim 1, wherein if the SOC of the energy storage system at the current time is in the first preset primary frequency modulation range, it is determined whether the SOC of the energy storage system at the current time is in a second preset primary frequency modulation range;
and if the SOC of the energy storage system at the current moment is in the second preset primary frequency modulation range, the SOC of the energy storage system is not adjusted.
3. The method according to claim 2, wherein if the SOC of the energy storage system at the current time is not within the second preset primary frequency modulation range, determining whether a fluctuation rate of the output power of the wind storage system is greater than a preset threshold;
and if the fluctuation rate is larger than the preset threshold, adjusting the SOC of the energy storage system by taking the second preset primary frequency modulation range as a target according to the SOC of the energy storage system at the current moment.
4. The method for returning the energy storage SOC of the wind energy storage system according to claim 3, wherein the adjusting the SOC of the energy storage system with the second preset primary frequency modulation range as a target according to the SOC of the energy storage system at the current time comprises:
determining smooth power according to the fan power at the current moment and the wind storage combined power at the previous moment in the wind storage system;
judging whether the SOC of the energy storage system at the current moment is smaller than the second preset primary frequency modulation range or not;
if the SOC of the energy storage system at the current moment is smaller than the second preset primary frequency modulation range, charging the SOC of the energy storage system when the smooth power is larger than zero, and discharging the SOC of the energy storage system when the smooth power is smaller than zero;
and if the SOC of the energy storage system at the current moment is larger than the second preset primary frequency modulation range, charging the SOC of the energy storage system when the smooth power is larger than zero, and discharging the SOC of the energy storage system when the smooth power is smaller than zero.
5. The method according to claim 4, wherein when the SOC of the energy storage system at the current moment is smaller than the second preset primary frequency modulation range, the charging power of the energy storage system is equal to the smooth power, and the discharging power of the energy storage system is equal to the product of the first preset proportion and the smooth power;
when the SOC of the energy storage system at the current moment is smaller than the second preset primary frequency modulation range, the charging power of the energy storage system is equal to the product of the first preset proportion and the smooth power, and the discharging power of the energy storage system is equal to the smooth power;
the first preset proportion is greater than zero and less than 1.
6. The energy storage SOC homing method of the wind storage system according to claim 4, wherein determining a smooth power according to a current wind turbine power and a previous wind storage combined power in the wind storage system comprises:
and determining the sum of the fan power at the current moment and the wind storage combined power at the previous moment in the wind storage system as the smooth power according to a second preset proportion.
7. The method for homing in the energy storage SOC of the wind storage system according to claim 3, wherein the fluctuation rate is the ratio of the fluctuation amount of the output power of the wind storage system to the rated fan power in the wind storage system;
the fluctuation quantity of the output power of the wind storage system is equal to the difference between the fan power at the current moment in the wind storage system and the wind storage combined power at the previous moment in the wind storage system.
8. The method according to claim 3, wherein if the fluctuation rate is less than or equal to the preset threshold, the SOC of the energy storage system is not adjusted.
9. The method for homing the energy storage SOC of the wind storage system according to any one of claims 1 to 8, wherein before determining whether the SOC of the wind storage system at the current time is in the first preset primary frequency modulation range, the method further comprises:
judging whether the frequency of the grid-connected point of the wind storage system is in a dead zone state;
and if the frequency of the grid-connected point of the wind storage system is in the dead zone state, executing a step of judging whether the SOC of the energy storage system in the wind storage system at the current moment is in a first preset primary frequency modulation range.
10. The method for homing the energy storage SOC of the wind energy storage system according to claim 9, wherein after waiting for a preset time, the step of determining whether the frequency of the grid-connected point of the wind energy storage system is in a dead zone state is performed.
11. The method for homing the energy storage SOC of the wind energy storage system according to any one of claims 1 to 8, wherein the adjusting the SOC of the energy storage system with the first preset primary frequency modulation range as a target comprises:
judging whether the SOC of the energy storage system at the current moment is smaller than the first preset primary frequency modulation range or not;
if the SOC of the energy storage system at the current moment is smaller than the first preset primary frequency modulation range, charging the energy storage system, wherein the charging power is equal to first preset power;
and if the SOC of the energy storage system at the current moment is larger than the first preset primary frequency modulation range, discharging the energy storage system, wherein the discharging power is equal to second preset power.
12. The energy storage SOC homing method of a wind storage system according to claim 11, wherein the first preset power is a lower value of a maximum limit fan power of the wind storage system and a maximum charging power of the energy storage system;
the second preset power is the smaller value of the difference between the maximum wind storage combined power of the wind storage system and the power of the fan at the current moment and the maximum discharge power of the energy storage system.
13. The method for homing the energy storage SOC of the wind storage system according to any one of claims 1 to 8, wherein the step of determining whether the wind storage system is in a primary frequency modulation idle period is performed periodically or continuously.
14. A wind storage system, comprising: the wind power generation system comprises a wind power converter, a direct current conversion module, an energy storage system, a controller and at least one fan; wherein:
each fan is connected with a power grid and/or a load through the wind power converter;
the energy storage system is connected to a direct current bus of the wind power converter through the direct current conversion module;
the controller is respectively in communication connection with the wind power converter and the energy storage system, and is used for executing the energy storage SOC homing method of the wind storage system as claimed in any one of claims 1 to 13.
15. The wind storage system of claim 14, wherein said controller is a system controller independent of said wind power converter or an internal controller integrated into said wind power converter.
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