CN115764939A - Energy storage energy management method and system for offshore wind power absorption and peak shaving frequency modulation - Google Patents
Energy storage energy management method and system for offshore wind power absorption and peak shaving frequency modulation Download PDFInfo
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Abstract
The invention discloses an energy storage energy management method and system for offshore wind power absorption and peak regulation and frequency modulation, wherein the energy storage energy management method comprises the following steps: acquiring the current wind power plant operation data and the energy storage power station charge state data; obtaining the power limiting state of the offshore wind farm according to the current wind farm operation data and the energy storage power station charge state data; if the power is limited, the offshore wind farm outputs power according to the power-limiting dispatching plan, and the energy storage power station is charged with the maximum power; if the power is not limited, the operation modes of the wind power plant and the energy storage power station are selected to be a frequency modulation mode or a peak regulation mode; and correcting the output of the wind power plant and the stored energy according to the correction result in the frequency modulation mode or the peak regulation mode. The method can regulate and control the charge and discharge power and the charge state of the energy storage power station in real time, achieves the aims of improving the offshore wind power consumption and peak shaving frequency modulation, and optimizes the energy management of the energy storage power station.
Description
Technical Field
The invention relates to the technical field of power management, in particular to energy management of an energy storage power station, and particularly relates to an energy storage energy management method and system for offshore wind power absorption and peak and frequency modulation.
Background
Under the global large background of reducing carbon emission, new energy power generation gradually becomes a main source of primary energy consumption, and the rapid development of new energy is beneficial to diversification of energy consumption of various countries, optimization of energy structures and improvement of capability of coping with emergencies. With the development of new energy development potential, the offshore wind farm is a trend from a land wind farm to the offshore wind farm because the characteristics of no need of considering the influence of the terrain on the wind speed, high power generation utilization rate, small influence on the ecological environment and the like.
With the rapid development of various energy storage batteries and integrated assembly technologies thereof, the new energy station is provided with an energy storage power station to solve the problems of fluctuation, intermittence, seasonality and the like of new energy, and meanwhile, the energy storage power station can also participate in single or multiple applications of peak regulation and frequency modulation, peak clipping and valley filling, planned output tracking, smooth wind power fluctuation and the like of a power grid.
At present, the energy management method of the offshore wind farm basically depends on the adjustment of the wind farm or is transmitted to an onshore converter station through a seabed high-voltage direct-current cable, and then peak regulation and frequency modulation are realized by the converter station, and the aims of remote consumption and peak regulation and frequency modulation of the energy management of the offshore wind farm cannot be well realized.
After an offshore wind plant is provided with an energy storage power station, how to realize energy management of the energy storage power station so as to meet the demand of improving peak and frequency regulation of the offshore wind plant is a core problem. At present, an energy management method for configuring a large-capacity energy storage power station in an offshore wind farm is lacked.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an energy storage energy management method and system for offshore wind power absorption and peak-shaving frequency modulation. The method can regulate and control the charge and discharge power and the charge state of the energy storage power station in real time, achieves the aims of improving the offshore wind power consumption and peak shaving frequency modulation, and optimizes the energy management of the energy storage power station.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
an energy storage energy management method for offshore wind power absorption and peak shaving frequency modulation comprises the following steps:
acquiring the current wind power plant operation data and the energy storage power station charge state data;
obtaining the power limiting state of the offshore wind farm according to the current wind farm operation data and the energy storage power station charge state data; if the power is limited, the offshore wind farm outputs power according to the power-limiting dispatching plan, and the energy storage power station is charged with the maximum power; if the power is not limited, the operation modes of the wind power plant and the energy storage power station are selected to be a frequency modulation mode or a peak regulation mode;
and correcting the output of the wind power plant and the stored energy according to the correction result in the frequency modulation mode or the peak regulation mode.
As a further improvement of the present invention, the obtaining of the power limiting state of the offshore wind farm according to the current time wind farm operation data and the energy storage power station charge state data includes:
obtaining a power limit plan and a non-power limit plan of an offshore wind farm from the day-ahead scheduling data of the wind farm,
and judging whether the offshore wind farm is in a power limiting plan or a non-power limiting plan according to the current wind farm operation data and the energy storage power station charge state data to obtain the power limiting state of the offshore wind farm.
As a further improvement of the present invention, the frequency modulation mode includes:
obtaining frequency data for a land based converter station
Frequency modulation data of a wind farm;
calculating frequency measurement value at offshore wind farm node through wind farm frequency modulation data
Calculating the frequency difference between the offshore wind farm and the onshore converter station
Comparing whether the frequency difference is smaller than the frequency modulation dead zone, if so, maintaining the original state of the offshore wind farm, and not operating the energy storage power station; if not, judging that the current frequency modulation requirement is a short-time peak requirement or a long-time steady-state requirement, if the current frequency modulation requirement is the short-time peak requirement, converting the offshore wind farm into distributed cluster control, and correcting the output power of the motor in the wind farm; if the current frequency modulation requirement is a long-term steady-state requirement, the high-capacity energy storage power station adopts droop control to adjust the output power of the power station;
and outputting the frequency modulation mode adjustment result.
As a further improvement of the invention, the high-capacity energy storage power station adopts droop control to regulate the output power of the power station and controls the regulation coefficient delta t Comprises the following steps:
in the formula, delta t To control the adjustment factor;
the difference value of the real-time frequency and the power frequency is obtained;
is a real-time frequency; alpha is a primary frequency modulation dead zone;
the power frequency of the power grid is obtained;
and satisfies the following constraints:
-0.1≤δ t ≤0.1
when in use
And delta t >At 0, the correction is: delta t And =0, the output power of the energy storage power station is:
in the formula (I), the compound is shown in the specification,
the output power of the energy storage power station;
the rated power of the energy storage power station.
As a further improvement of the present invention, the peak shaving mode includes:
obtaining predicted output power data of a wind power plant and voltage and current data of each node of the wind power plant;
calculating the output power of the wind power plant of each node according to the voltage and current data of each node of the wind power plant; calculating the actual output power of the offshore wind farm according to the output power of the wind farm at each node, and the difference value between the actual output power and the predicted output power;
judging whether the absolute value of the actual difference value and the predicted difference value is smaller than a preset peak-shaving dead zone, if so, outputting the output of the offshore wind farm according to a day-ahead prediction plan; if not, judging whether the wind power plant can be subjected to self-peak regulation and consumption at the current moment; if so, correcting the output factor of each fan in the wind power plant again, and adjusting the output power of each fan according to the corrected output factor; if not, judging the SOC state of the high-capacity energy storage power station at the current moment; correcting the output power of the energy storage power station according to the SOC state of the energy storage power station;
and outputting a peak regulation mode regulation result.
As a further improvement of the present invention, the SOC state of the large-capacity energy storage power station at the current time is determined according to the following SOC calculation formula:
in the formula (I), the compound is shown in the specification,
the state of charge of the energy storage power station at the moment t;
the state of charge of the energy storage power station at the initial moment is obtained; delta t is a data sampling interval of the peak regulation and absorption mode; t is the total number of samples in one day;
the output power of the energy storage power station;
rated capacity for the energy storage power station;
set up the SOC working range of energy storage power station, avoid the power station to shorten life because of overcharging overdischarging, the range of setting as follows:
as a further improvement of the invention, the output power of the energy storage power station is corrected according to the SOC state of the energy storage power station,
the SOC state of the energy storage power station is divided into 4 charging and discharging modes, which are as follows:
in the formula (I), the compound is shown in the specification,
the maximum discharge power of the energy storage power station at the moment t;
the discharge power of the energy storage power station at the moment t;
the charging power of the energy storage power station at the moment t;
the maximum discharge power of the energy storage power station at the moment t.
As a further improvement of the present invention, the selecting the operation mode of the wind farm and the energy storage power station as the frequency modulation mode or the peak modulation mode comprises:
and judging whether the mode Flag bit Flag is 1, if Flag =1, selecting the operation mode of the wind power plant and the energy storage power station as a peak shaving mode, and otherwise, selecting the operation mode as a frequency modulation mode.
An energy storage energy management system for offshore wind power absorption and peak shaving frequency modulation comprises:
the acquisition module is used for acquiring the operation data of the wind power plant at the current moment and the charge state data of the energy storage power station;
the selection module is used for obtaining the power limiting state of the offshore wind farm according to the wind farm operation data and the energy storage power station charge state data at the current moment; if the power is limited, the offshore wind farm outputs power according to the power-limiting dispatching plan, and the energy storage power station is charged with the maximum power; if the power is not limited, the operation mode of the wind power plant and the energy storage power station is selected to be a frequency modulation mode or a peak regulation mode;
and the correction module is used for correcting the wind power plant and the energy storage output according to the correction result in the frequency modulation mode or the peak regulation mode.
An electronic device comprising a memory, a processor and a computer program stored in said memory and executable on said processor, said processor implementing the steps of said method for energy storage energy management for offshore wind power consumption and peak shaving frequency modulation when executing said computer program.
A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method for offshore wind power absorption and peak shaving energy management.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an energy management method for an energy storage power station, which can improve the peak-load and frequency-modulation capacity of offshore wind power. In an offshore power system, the problems of output power fluctuation and intermittence of a wind turbine generator caused by wind power characteristics are solved by configuring an energy storage power station, and the difficulty of peak regulation and frequency modulation of an offshore wind power plant is solved. The method has the functions of considering the prediction error of the offshore wind power and detecting the charge state of the high-capacity energy storage power station, thereby meeting the continuous and stable peak-load and frequency-modulation requirements of the offshore wind farm. The strategy mainly combines an offshore wind power prediction result, an offshore wind power peak-and-frequency-modulation dead zone and an energy storage power station SOC value, can regulate and control the charge and discharge power and the charge state of the energy storage power station in real time, achieves the purpose of improving offshore wind power consumption and peak-and-frequency-modulation, and optimizes energy management of the energy storage power station.
Drawings
FIG. 1 is a schematic view of an offshore wind farm topology;
FIG. 2 is a control flow chart of the present invention;
FIG. 3 is a flow chart of a portion of energy management frequency modulation;
FIG. 4 is a flow chart of a portion of energy management peak shaver digestion;
FIG. 5 is an energy storage management system for offshore wind power absorption and peak shaving frequency modulation according to the present invention;
fig. 6 is a schematic diagram of an electronic device according to the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Aiming at the problems of the energy storage power station such as the improvement of the peak load and frequency modulation capability of offshore wind power, the invention aims to provide an energy storage energy management method for improving the offshore wind power consumption and the peak load and frequency modulation capability. The offshore wind power station obviously improves the stability of wind power generation, optimizes the energy consumption structure of a power grid and improves the reliability and the technical performance of the power grid by reasonably configuring an energy storage power station.
Example 1
As shown in fig. 2, an energy storage energy management method for offshore wind power absorption and peak shaving frequency modulation includes the following steps:
(1) The energy management control strategy comprises the following main steps:
step 2, judging whether the dispatching center enables the offshore wind farm to be in a power limiting state; if the power limiting mode is switched, the offshore wind farm outputs power according to the power limiting dispatching plan, and the energy storage power station is charged at the maximum power; if not, entering a power limiting mode, and then entering a step 3;
wherein, optionally, judging whether the dispatching center allows the offshore wind farm to be in the power limiting state comprises:
obtaining a power limit plan and a non-power limit plan of an offshore wind farm from the day-ahead scheduling data of the wind farm,
and judging whether the offshore wind farm is in a power limiting plan or a non-power limiting plan according to the current wind farm operation data and the energy storage power station charge state data to obtain the power limiting state of the offshore wind farm.
Step 3, adjusting an adjusting mode of the offshore wind power plant, selecting the operation modes of the wind power plant and the energy storage power station as a frequency modulation mode or a peak modulation mode, and entering step 4;
and 4, sending the correction results in the two modes to the offshore wind farm and the energy storage power station to correct the output conditions of the offshore wind farm and the energy storage power station.
The energy storage energy management method provided by the invention has the functions of considering the offshore wind power prediction error and detecting the charge state of a large-capacity energy storage power station, so that the continuous and stable peak and frequency regulation requirement of an offshore wind farm can be met. The strategy mainly combines an offshore wind power prediction result, an offshore wind power peak-and-frequency-modulation dead zone and an energy storage power station SOC value, can regulate and control the charge and discharge power and the charge state of the energy storage power station in real time, achieves the purpose of improving offshore wind power consumption and peak-and-frequency-modulation, and optimizes energy management of the energy storage power station.
As a further improvement of the present invention, as shown in fig. 3, the frequency modulation part includes:
step 21: obtaining frequency data for land based converter stations
Frequency modulation data of a wind farm;
step 22: calculating frequency measurement value at offshore wind farm node through wind farm frequency modulation data
Step 23: calculating frequency difference value of offshore wind power plant and onshore converter station
Step 24: judging whether the frequency difference value is smaller than a frequency modulation dead zone, if so, turning to a step 25, and if not, turning to a step 26;
step 25: the offshore wind power station maintains the original state, and the energy storage power station does not act;
step 26: judging whether the current frequency modulation requirement is a short-time peak requirement or a long-time steady-state requirement, if the current frequency modulation requirement is the short-time peak requirement, converting the offshore wind farm into distributed cluster control, and correcting the output power of the motor in the wind farm; if the current frequency modulation requirement is a long-term steady-state requirement, the high-capacity energy storage power station adopts droop control to adjust the output power of the power station;
and 7: and feeding back the adjustment result to a main program.
As a further improvement of the present invention, as shown in fig. 4, the peak-shaving absorbing part includes:
step 31: predicting output power data and voltage and current data of each node of the wind power plant by the wind power plant;
step 32: calculating the output power of the wind power plant of each node according to the voltage and current data of each node of the wind power plant;
step 33: calculating the actual output power of the offshore wind farm according to the output power of the wind farm at each node, and the difference value between the actual output power and the predicted output power;
step 34: judging whether the absolute value of the actual difference value and the predicted difference value is smaller than a preset peak-shaving dead zone, if so, outputting the output of the offshore wind farm according to a day-ahead prediction plan; if not, go to step 35;
step 35: judging whether the wind power plant can adjust the peak to be consumed at the current moment, if so, entering a step 36, and if not, entering a step 38;
step 36: revising the output factors of all fans of the wind power plant;
step 37: adjusting the output power of each fan according to the corrected output factor;
step 38: judging the SOC state (charge state) of the high-capacity energy storage power station at the current moment;
step 39: correcting the output power of the energy storage power station according to the SOC state of the energy storage power station;
step 310: and feeding back the correction result to the main program.
The method of the present invention will be described in detail with reference to specific examples.
Example 2
The energy management method is applied to offshore wind power plants with large offshore distances, a plurality of wind power sets in the offshore wind power plants are adjusted simultaneously, and the energy storage power stations adopt a plurality of types of energy storage systems.
Referring to fig. 1, the topology structure of the offshore wind farm includes n wind turbine generators in the farm, and the electric energy of the offshore wind farm is jointly generated and transmitted to the grid through the onshore converter station and the onshore energy storage power station through n offshore transformers, n AC \ DC conversions, n DC \ DC conversions and the like.
As shown in fig. 2, the energy management control strategy mainly comprises the following steps:
step 2, judging whether the dispatching center enables the offshore wind farm to be in a power limiting state; if yes, switching to a power limiting mode, and enabling the offshore wind farm to be scheduled according to a power limiting schedule
Maximum power of power output and energy storage power station
Charging; if not, entering step 3;
step 3, adjusting the operation modes of the offshore wind power station and the high-capacity energy storage power station, judging whether a mode Flag bit is 1, if the Flag is =1, selecting the operation modes of the wind power station and the energy storage power station as a peak regulation mode, otherwise, selecting the operation modes as a frequency modulation mode, and entering the step 4;
and step 4, sending the correction results in the two modes to the offshore wind farm and the energy storage power station to correct the output conditions of the offshore wind farm and the energy storage power station.
As shown in fig. 3, the frequency tuning part of the energy management control strategy comprises the following steps:
step 21: obtaining frequency data for a land based converter station
Frequency modulation data of a wind farm;
step 22: calculating frequency measurement value at offshore wind farm node through wind farm frequency modulation data
Step 23: meterCalculating the frequency difference between offshore wind farm and onshore converter station
Wherein
Frequency for a land based converter station;
step 24: determining a frequency difference
If the frequency modulation dead zone alpha is smaller than the frequency modulation dead zone alpha, turning to the step 5, and if the frequency modulation dead zone alpha is not smaller than the frequency modulation dead zone alpha, turning to the step 26;
step 25: scheduling plan of offshore wind farm
Output power, no action of energy-storage power station
Step 26: judging whether the current frequency modulation requirement is a short-time peak requirement or a long-time steady-state requirement, if the current frequency modulation requirement is the short-time peak requirement, converting the offshore wind farm into distributed cluster control, and correcting the output power of each motor in the wind farm to meet the short-time peak requirement of frequency modulation at the current moment; and if the current frequency modulation requirement is a long-term steady-state requirement, the energy storage power station adopts droop control to adjust the output power of the energy storage power station.
The distributed cluster control is that each unit in the wind power plant adjusts the output power of the unit according to the specific frequency modulation requirement, and because the wind power plant generally operates in the MPPT state, the redundant frequency modulation power can be provided in a limited manner, so that the distributed cluster control is suitable for responding the short-time peak requirement of the system; the energy storage power station adopts droop control, and the control adjustment coefficient delta of the energy storage power station t Comprises the following steps:
in the formula, delta t To control the adjustment factor;
the frequency difference value of the offshore wind power plant and the onshore convertor station is obtained;
real-time frequency for a land converter station; alpha is a primary frequency modulation dead zone;
the frequency is the real-time frequency of the offshore wind farm.
And satisfies the following constraints:
-0.1≤δ t ≤0.1
when the temperature is higher than the set temperature
And delta t >At 0, the correction is: delta. For the preparation of a coating t And =0, the output power of the energy storage power station is:
in the formula (I), the compound is shown in the specification,
is the output power of the energy storage power station;
the rated power of the energy storage power station;
and 7: and feeding back the adjustment result to a main program.
As shown in fig. 4, the peak shaving and absorption part of the energy management control strategy comprises the following steps:
step 31: predicting output power data and voltage and current data of each node of the wind power plant by the wind power plant;
step 32: calculating the output power of each node wind power plant according to the voltage and current data of each node of the wind power plant
Step 33: calculating the actual output power of the offshore wind farm according to the output power of the wind farm at each node, and calculating the difference value between the actual output power and the predicted output power
Step 34: determining the absolute value of the actual and predicted difference
Whether the peak load is smaller than a preset peak regulation dead zone beta or not, if so, the offshore wind farm is predicted according to the day-ahead plan
Force is exerted; if not, go to step 35;
step 35: judging whether the wind power plant unit can adjust the peak to be consumed at the current moment, if so, entering a step 36, and if not, entering a step 37;
step 36-1: revising output factor lambda of each fan of wind power plant i ；
Step 36-2: adjusting the output power of each fan according to the corrected output factor
Entering step 38;
step 37-1: judging the SOC state of the energy storage power station at the current moment, wherein an SOC calculation formula is as follows:
in the formula (I), the compound is shown in the specification,
the state of charge of the energy storage power station at the moment t;
the state of charge of the energy storage power station at the initial moment is obtained; delta t is the peak regulation and absorption modeData sampling interval, here set to 1min; t is the total number of samples in a day, set to 1440;
is the output power of the energy storage power station;
rated capacity for the energy storage power station;
set up the SOC working range of energy storage power station, avoid the power station to shorten life because of overcharging overdischarging, the range of setting as follows:
step 37-2: correcting the output power of the energy storage power station according to the SOC state of the energy storage power station
The SOC state of the energy storage power station is divided into 4 charging and discharging modes, which are as follows:
in the formula (I), the compound is shown in the specification,
the maximum discharge power of the energy storage power station at the moment t;
the discharge power of the energy storage power station at the moment t;
the charging power of the energy storage power station at the moment t;
the maximum discharge power of the energy storage power station at the moment t;
step 38: and feeding back the correction result to the main program.
By adopting the technical scheme, the offshore wind power station has the functions of peak clipping, valley filling and active supporting for the offshore wind power station, and the energy storage power station can not only respond to the adjustment requirement of the offshore wind power station on the power grid frequency, but also meet the requirement of an onshore power grid on peak clipping and absorption. The method has the characteristics of quick charging and quick discharging of the energy storage power station, can quickly respond to the requirements of a power grid on peak regulation, frequency modulation and the like of an offshore wind farm, and can solve the frequency disturbance caused by the large-scale integration of the offshore wind farm into the power grid. The offshore wind power station obviously improves the stability of wind power generation, optimizes the energy consumption structure of a power grid and improves the reliability and the technical performance of the power grid by reasonably configuring an energy storage power station.
As shown in fig. 5, the present invention further provides an energy storage management system for offshore wind power absorption and peak shaving frequency modulation, comprising:
the acquisition module is used for acquiring the operating data of the wind power plant and the charge state data of the energy storage power station at the current moment;
the selection module is used for obtaining the electricity limiting state of the offshore wind farm according to the current wind farm operation data and the energy storage power station charge state data; if the power is limited, the offshore wind farm outputs power according to the power-limiting dispatching plan, and the energy storage power station is charged with the maximum power; if the power is not limited, the operation modes of the wind power plant and the energy storage power station are selected to be a frequency modulation mode or a peak regulation mode;
and the correction module is used for correcting the wind power plant and the stored energy output according to the correction result in the frequency modulation mode or the peak regulation mode.
The selection module comprises a frequency modulation module and a peak regulation module;
the frequency modulation module comprises:
a first acquisition unit for acquiring frequency data of the land converter station
Frequency modulation data of a wind farm;
a first calculation unit for calculating the frequency measurement value at the offshore wind farm node through the wind farm frequency modulation data
Calculating the frequency difference between the offshore wind farm and the onshore converter station
The first control unit is used for comparing whether the frequency difference value is smaller than a frequency modulation dead zone, if so, the offshore wind farm maintains the original state, and the energy storage power station does not act; if not, judging that the current frequency modulation requirement is a short-time peak requirement or a long-time steady-state requirement, if the current frequency modulation requirement is the short-time peak requirement, converting the offshore wind farm into distributed cluster control, and correcting the output power of the motor in the wind farm; if the current frequency modulation requirement is a long-term steady-state requirement, the high-capacity energy storage power station adopts droop control to adjust the output power of the power station;
and the first output unit is used for outputting the frequency modulation mode adjusting result.
The peak shaving module comprises:
the second acquisition unit is used for predicting output power data and voltage and current data of each node of the wind power plant;
the second calculation unit is used for calculating the output power of the wind power plant at each node according to the voltage and current data of each node of the wind power plant; calculating the actual output power of the offshore wind farm according to the output power of the wind farm at each node, and the difference value between the actual output power and the predicted output power;
the second control unit is used for judging whether the absolute value of the actual difference value and the prediction difference value is smaller than a preset peak regulation dead zone or not, and if so, outputting the offshore wind farm according to a day-ahead prediction plan; if not, judging whether the wind power plant can adjust the peak to be consumed at the current moment or not; if so, correcting the output factor of each fan in the wind power plant again, and adjusting the output power of each fan according to the corrected output factor; if not, judging the SOC state of the high-capacity energy storage power station at the current moment; correcting the output power of the energy storage power station according to the SOC state of the energy storage power station;
and the second output unit is used for outputting the peak shaving mode adjusting result.
As shown in fig. 6, the present invention provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the energy storage management method for offshore wind power absorption and peak shaving frequency modulation when executing the computer program.
The energy storage energy management method for offshore wind power absorption and peak shaving frequency modulation comprises the following steps:
acquiring day-ahead scheduling data, current-time operation data and energy storage power station state data of a wind power plant;
obtaining a power limiting plan of the offshore wind farm, and if the power is limited, outputting power by the offshore wind farm according to the power limiting dispatching plan, and charging the energy storage power station at the maximum power; if the power is not limited, the operation mode of the wind power plant and the energy storage power station is selected to be a frequency modulation mode or a peak regulation mode;
and correcting the wind power plant and the stored energy output according to the correction result in the frequency modulation or peak regulation mode.
The invention also provides a computer-readable storage medium, which stores a computer program that, when executed by a processor, implements the steps of the energy storage energy management method for offshore wind power absorption and peak shaving frequency modulation.
The energy storage energy management method for offshore wind power absorption and peak shaving frequency modulation comprises the following steps:
acquiring day-ahead scheduling data, current-time operation data and energy storage power station state data of a wind power plant;
obtaining a power limiting plan of the offshore wind farm, and if the power is limited, outputting power by the offshore wind farm according to the power limiting dispatching plan, and charging the energy storage power station at the maximum power; if the power is not limited, the operation mode of the wind power plant and the energy storage power station is selected to be a frequency modulation mode or a peak regulation mode;
and correcting the wind power plant and the stored energy output according to the correction result in the frequency modulation or peak regulation mode.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (11)
1. An energy storage energy management method for offshore wind power absorption and peak regulation and frequency modulation is characterized by comprising the following steps:
acquiring the current wind power plant operation data and the energy storage power station charge state data;
obtaining the power limiting state of the offshore wind farm according to the current wind farm operation data and the energy storage power station charge state data; if the power is limited, the offshore wind farm outputs power according to the power limiting scheduling plan, and the energy storage power station is charged at the maximum power; if the power is not limited, the operation modes of the wind power plant and the energy storage power station are selected to be a frequency modulation mode or a peak regulation mode;
and correcting the output of the wind power plant and the stored energy according to the correction result in the frequency modulation mode or the peak regulation mode.
2. The offshore wind power consumption and peak shaving frequency modulation energy storage energy management method according to claim 1, wherein the obtaining of the power limiting state of the offshore wind farm according to the current wind farm operation data and the energy storage power station state of charge data comprises:
obtaining a power limit plan and a non-power limit plan of an offshore wind farm from the day-ahead scheduling data of the wind farm,
and judging whether the offshore wind farm is in a power limiting plan or a non-power limiting plan according to the current wind farm operation data and the energy storage power station charge state data to obtain the power limiting state of the offshore wind farm.
3. The offshore wind power consumption and peak shaving frequency modulation stored energy management method of claim 1, wherein the frequency modulation mode comprises:
obtaining frequency data for land based converter stations
Frequency modulation data of a wind farm;
calculating frequency measurement value at offshore wind farm node through wind farm frequency modulation data
Calculating the frequency difference between the offshore wind farm and the onshore converter station
Comparing whether the frequency difference is smaller than the frequency modulation dead zone, if so, maintaining the original state of the offshore wind farm, and not operating the energy storage power station; if not, judging that the current frequency modulation requirement is a short-time peak requirement or a long-time steady-state requirement, if the current frequency modulation requirement is the short-time peak requirement, converting the offshore wind farm into distributed cluster control, and correcting the output power of the motor in the wind farm; if the current frequency modulation requirement is a long-term steady-state requirement, the high-capacity energy storage power station adopts droop control to adjust the output power of the power station;
and outputting the frequency modulation mode adjustment result.
4. The offshore wind power consumption and peak and frequency modulation energy storage energy management method according to claim 3, characterized in that the high-capacity energy storage power station adopts droop control to adjust the output power of the power station and control the adjustment coefficient delta t Comprises the following steps:
in the formula, delta t To control the adjustment factor;
the difference value of the real-time frequency and the power frequency is obtained;
is a real-time frequency; alpha is a primary frequency modulation dead zone;
the power frequency of the power grid is obtained;
and satisfies the following constraints:
-0.1≤δ t ≤0.1
when in use
And delta t >At 0, the correction is: delta t And =0, the output power of the energy storage power station is:
in the formula (I), the compound is shown in the specification,
the output power of the energy storage power station;
the rated power of the energy storage power station.
5. The offshore wind power consumption and peak shaving frequency modulation stored energy management method of claim 1, wherein the peak shaving mode comprises:
obtaining voltage and current data of each node of the wind power plant;
calculating the output power of the wind power plant of each node according to the voltage and current data of each node of the wind power plant; calculating the actual output power of the offshore wind farm according to the output power of the wind farm at each node to obtain the difference value between the actual output power and the predicted output power of the offshore wind farm;
judging whether the absolute value of the actual difference value and the predicted difference value is smaller than a preset peak-shaving dead zone, if so, outputting the output of the offshore wind farm according to a day-ahead prediction plan; if not, judging whether the wind power plant can adjust the peak to be consumed at the current moment or not; if so, revising the output factor of each fan in the wind power plant, and adjusting the output power of each fan according to the revised output factor; if not, judging the SOC state of the high-capacity energy storage power station at the current moment; correcting the output power of the energy storage power station according to the SOC state of the energy storage power station;
and outputting a peak shaving mode adjusting result.
6. The offshore wind power consumption and peak shaving frequency modulation energy storage energy management method according to claim 5, wherein the SOC state of the large-capacity energy storage power station at the current moment is judged, and the SOC calculation formula is as follows:
in the formula (I), the compound is shown in the specification,
the state of charge of the energy storage power station at the moment t;
the state of charge of the energy storage power station at the initial moment is obtained; delta t is a data sampling interval of the peak regulation and absorption mode; t is the total number of samples in one day;
is the output power of the energy storage power station;
rated capacity for the energy storage power station;
the SOC working range of the energy storage power station is set, the phenomenon that the service life of the power station is shortened due to overcharge and overdischarge is avoided, and the setting range is as follows:
7. the offshore wind power consumption and peak shaving frequency modulation energy storage energy management method according to claim 5, characterized in that said energy storage power station output power is corrected according to said energy storage power station SOC state,
the SOC state of the energy storage power station is divided into 4 charging and discharging forms, which are as follows:
in the formula (I), the compound is shown in the specification,
the maximum discharge power of the energy storage power station at the moment t;
the discharge power of the energy storage power station at the moment t;
the charging power of the energy storage power station at the moment t;
the maximum discharge power of the energy storage power station at the moment t.
8. The offshore wind power consumption and peak shaving frequency modulation energy storage energy management method of claim 1, wherein said selecting a wind farm and energy storage power plant operating mode as a frequency modulation mode or a peak shaving mode comprises:
and judging whether the mode Flag bit Flag is 1, if Flag =1, selecting the operation mode of the wind power plant and the energy storage power station as a peak shaving mode, and otherwise, selecting the operation mode as a frequency modulation mode.
9. The utility model provides an energy storage energy management system of marine wind power consumption and peak shaving frequency modulation which characterized in that includes:
the acquisition module is used for acquiring the operation data of the wind power plant at the current moment and the charge state data of the energy storage power station;
the selection module is used for obtaining the electricity limiting state of the offshore wind farm according to the current wind farm operation data and the energy storage power station charge state data; if the power is limited, the offshore wind farm outputs power according to the power-limiting dispatching plan, and the energy storage power station is charged with the maximum power; if the power is not limited, the operation modes of the wind power plant and the energy storage power station are selected to be a frequency modulation mode or a peak regulation mode;
and the correction module is used for correcting the wind power plant and the stored energy output according to the correction result in the frequency modulation mode or the peak regulation mode.
10. An electronic device comprising a memory, a processor and a computer program stored in said memory and executable on said processor, said processor implementing the steps of the method for offshore wind power consumption and peak shaving energy management according to any of claims 1-8 when executing said computer program.
11. A computer-readable storage medium, having stored thereon a computer program for implementing the steps of the method for offshore wind power consumption and peak and frequency modulation stored energy management according to any of claims 1-8 when being executed by a processor.
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| CN116632880A (en) * | 2023-07-25 | 2023-08-22 | 深圳量云能源网络科技有限公司 | Multifunctional coordination control method and device for wind farm energy storage system and terminal equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116632880A (en) * | 2023-07-25 | 2023-08-22 | 深圳量云能源网络科技有限公司 | Multifunctional coordination control method and device for wind farm energy storage system and terminal equipment |
| CN116632880B (en) * | 2023-07-25 | 2024-04-30 | 深圳量云能源网络科技有限公司 | Multifunctional coordination control method and device for wind farm energy storage system and terminal equipment |
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